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Seamless steel tubes EN 10216-2

Foreword
This document (EN 10216-2:2002) has been prepared by Technical Committee ECISS/TC 29, "Steel tubes and fittings for steel tubes", the secretariat of which is held by UNI.
This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2002, and conflicting national standards shall be withdrawn at the latest by November 2002.
This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative annex ZA, which is an integral part of this document.
Other Parts of EN 10216 are:
Part 1: Non-alloy steel tubes with specified room temperature properties.
Part 3 : Alloy fine grain steel tubes
Part 4 : Non-alloy and alloy steel tubes with specified low temperature properties
Part 5 : Stainless steel tubes
Another European Standard series covering tubes for pressure purposes is:
EN 10217: Welded steel tubes for pressure purposes

Foreword to amendment A1
This document (EN 10216-2:2002/A1:2004) has been prepared by Technical Committee ECISS/TC 29 "Steel tubes and fittings for steel tubes", the secretariat of which is held by UNI.
This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2004, and conflicting national standards shall be withdrawn at the latest by September 2004.
This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive 97/23/EC.
For relationship with EU Directive 97/23/EC, see informative annex ZA, which is an integral part of this document.

1. SCOPE
This Part of EN 10216 specifies the technical delivery conditions in two test categories for seamless tubes of circular cross section, with specified elevated temperature properties, made of non-alloy and alloy steel.
NOTE This Part of EN 10216 may also be applied for tubes of non-circular cross section; necessary modification should be agreed a the time of enquiry and order.

2. NORMATIVE REFERENCES
This European Standard incorporates by date or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For date references, subsequent amendments to or revisions of, any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments).
The requirements of this European Standard rule when they differ from those in the standards and documents referred to below:
EN 10002-1, Metallic materials – Tensile testing – Part 1: Method of test (at ambient temperature).
EN 10002-5, Metallic materials – Tensile testing – Part 5: Method of testing (at elevated temperature).
EN 10020, Definitions and classification of grades of steel.
EN 10021, General technical delivery requirements for steel and iron products.
EN 10027-1, Designation systems for steels – Part 1 : Steel names, principle symbols..
EN 10027-2, Designation systems for steels – Part 2: Numerical systems.
EN 10045-1, Metallic materials – Charpy impact test – Part 1: Test method.
EN 10052, Vocabulary of heat treatment terms for ferrous products.
EN 10204, Metallic products – Types of inspection documents.
ENV 10220, Seamless and welded steel tubes – Dimensions and masses per unit length
EN 10233, Metallic materials – Tubes – Flattening test.
EN 10234, Metallic materials – Tubes – Drift expanding test.
EN 10236, Metallic materials – Tubes – Ring expanding test.
EN 10237, Metallic materials – Tubes – Ring tensile test.
EN 10246-1, Non-Destructive Testing of steel tubes Part 1 : Automatic electromagnetic testing of seamless and welded (except submerged arc welded) ferromagnetic steel tubes for verification of hydraulic leak-tightness.
EN 10246-5, Non-Destructive Testing of steel tubes Part 5: Automatic full peripheral magnetic transducer/flux leakage testing of seamless and welded (except submerged arc-welded) ferromagnetic steel tubes for the detection of longitudinal imperfections.
EN 10246-6, Non-Destructive Testing of steel tubes – Part 6: Automatic full peripheral ultrasonic testing of seamless steel tubes for the detection of transverse imperfections.
EN 10246-7, Non-Destructive Testing of steel tubes – Part 7 : Automatic full peripheral ultrasonic testing of seamless and welded (except submerged arc welded) steel tubes for the detection of longitudinal imperfections.
EN 10246-14, Non-Destructive Testing of steel tubes – Part 14:Automatic ultrasonic testing of seamless and welded (except submerged arc welded) steel tubes for the detection of laminar imperfections.
EN 10256, Non-Destructive Testing of steel tubes – Qualification and competence of level 1 and level 2 NDT personnel.
EN ISO 377, Steel and steel products – Location and preparation of samples and test pieces for mechanical testing (ISO 377:1997)
prEN 101681) , Iron and steel products – Inspection documents – List of information and description.
prEN 102661), Steel tubes, fittings and structural hollow sections – Symbols and definition of terms for use in product standards
EN ISO 2566-1, Steel – Conversion of elongation values Part 1: Carbon and low-alloy steels (ISO 2566-1:1984)
ISO 14284, Steel and iron – Sampling and preparation of samples for the determination of chemical composition
CR 10260, Designation systems for steel – Additional symbols
CR 10261, ECISS Information Circular IC 11 – Iron and steel – Review of available methods of chemical analysis.

3. TERMS AND DEFINITIONS
For the purposes of this Part of EN 10216, the terms and definitions given in EN 10020, EN 10021, EN 10052 and prEN 10266 and the following apply:
3.1 test category
classification that indicates the extent and level of inspection and testing
3.2 employer
organisation for which a person works on a regular basis.
NOTE The employer may be either the tube manufacturer or supplier or a third party organisation providing, Non-Destructive Testing (NDT) services.

4. SYMBOLS
For the purpose of this Part of EN 10216, the symbols given in prEN 10266 and the following apply:
ꟷꟷꟷ d specified inside diameter;
ꟷꟷꟷ d_minspecified minimum inside diameter;
ꟷꟷꟷ T_minspecified minimum wall thickness;
ꟷꟷꟷ D_c calculated outside diameter;
ꟷꟷꟷ d_c calculated inside diameter;
1) In preparation; until this document is published as a European Standard, the corresponding national standard(s) should be agreed at the time of enquiry and order.
T_ccalculated wall thickness;
TC test category

5. CLASSIFICATION AND DESIGNATION
5.1 Classification
In accordance with the classification system in EN 10020, the steel grades P195GH, P235GH and P265GH are classified as non-alloy quality steels and the other steel grades are classified as alloy special steels.
5.2 Designation
5.2.1.For the tubes covered by this Part of EN 10216 the steel designation consists of:
ꟷꟷꟷ the number of this Part of EN 10216;
plus either:
ꟷꟷꟷ the steel name in accordance with EN 10027-1 and CR 10260;
or:
the steel number allocated in accordance with EN 10027-2.
5.2.2. The steel name of non-alloy steel grades is designated by:
ꟷꟷꟷ the capital letter P for pressure purposes;
ꟷꟷꟷ the indication of the specified minimum yield strength at room temperature for wall thickness less than or equal to 16 mm, expressed in MPa (see Table 4):
ꟷꟷꟷ the symbols GH for elevated temperature.
5.2.3 The steel name of alloy steel grades is designated by the chemical composition (see Table 2) and the symbols for the heat treatment, where specified in column 3 and footnote 3 of Table 1.

6. INFORMATION TO BE SUPPLIED BY THE PURCHASER
6.1.Mandatory information
The following information shall be supplied by the purchaser at the time of enquiry and order:
a) the quantity (mass or total length or number);
b) the term "tube";
c) the dimensions (outside diameter D and wall thickness T or a set of dimensions covered by Option 11) (see Table 6);
d) the designation of the steel grade in accordance with this Part of EN 10216 (see 5.2);
e) the test category for non-alloy steel (see 9.3).
6.2 Options
A number of options are specified in this Part of EN 10216 and these are listed below. In the event that the purchaser does not indicate a wish to implement any of these options at the time of enquiry and order, the tubes shall be supplied in accordance with the basic specification (see 6.1).
1) Cold finishing (see 7.3.2).
2) Restriction on copper and tin content (see Table 2).
3) Product analysis (see 8.2.2).
4) Impact testing (see Table 4).
5) Longitudinal impact testing at -10°C for non-alloy steel grades (see Table 4).
6) Tensile testing at elevated temperature (see 8.3.2).
7) Selection of leak-tightness test method (see 8.4.2.1).
8) Non-Destructive Testing for test category 2 tubes for detection of transverse imperfections (see 8.4.2.2).
9) Non-Destructive Testing for test category 2 tubes for detection of laminar imperfections (see 8.4.2.2).
10) Special ends preparation (see 8.6).
11) Set of dimensions other than D and T (see 8.7.1).
12) Exact lengths (see 8.7.3).
13) The type of inspection document other than the standard document (see 9.2.1).
14) Test pressure for hydrostatic leak-tightness test (see 11.8.1).
15) Wall thickness measurement away from the ends (see 11.9).
16) Non-Destructive Testing method (see 11.11.1).
17) Additional marking (see 12.2).
18) Protection (see 13).
6.3 Examples of an order
6.3.1 Example 1
100 t of seamless tube with an outside diameter of 168,3 mm, a wall thickness of 4,5 mm, in accordance with EN 10216-2, made of steel grade P265GH, to test category 1 with a 3.1.C inspection certificate in accordance with EN 10204:
100 t – Tube – 168,3 x 4,5 – EN 10216-2 – P265GH – TC1 – Option 13: 3.1.C
6.3.2. Example 2
100 m of seamless tube with a minimum inside diameter of 240 mm, a minimum wall thickness of 40 mm in accordance with Part of EN 10216, made of steel grade 10CrMo9-10, with a 3.1.C inspection certificate in accordance with EN 10204:
100 m – Tube – d_min 240 x T_min 40 – EN 10216-2 – 10CrMo9-10 – Option 13: 3.1.C

7. MANUFACTURING PROCESS
7.1 Steel making process
The steel making process is at the discretion of the manufacturer.
7.2 Deoxidation process
Steels shall be fully killed.
7.3 Tube manufacture and delivery conditions
7.3.1 All NDT activities shall be carried out by qualified and competent level 1,2 and/or 3 personnel authorised to operate by the employer.
The qualification shall be in accordance with EN 10256 or, at least, an equivalent to it.
It is recommended that the level 3 personnel be certified in accordance with EN 473 or, at least, an equivalent to it.
The operating authorisation issued by the employer shall be in accordance with a written procedure.
NDT operations shall be authorised by level 3 NDT individual approved by the employer.
NOTE The definition of level 1, 2 and 3 can be found in appropriate Standards, e.g. EN 473 and prEN 10256
7.3.2 The tubes shall be manufactured by a seamless process.
Unless option 1 is specified, the tubes may be either hot or cold finished at the discretion of the manufacturer. The terms hot finished and cold finished apply to the condition of the tube before it is heat treated in accordance with7.3.3.
Option 1: The tubes shall be cold finished before heat treatment.
7.3.3 The tubes shall be supplied in the relevant heat treatment conditions as specified in Table 1.

8. REQUIREMENTS
8.1 General
When supplied in a delivery condition indicated in clause 7.3 and inspected in accordance with clauses 9, 10 and 11, the tubes shall conform to the requirements of this Part of EN 10216.
In addition, the general technical delivery requirements specified in EN 10021 shall apply.
Tubes shall be suitable for hot and cold bending provided the bending is carried out in an appropriate manner.
When tubes are specified in the order by d, dmin or Tmin the following equations, with all terms in mm, shall apply for the calculation of outside diameter Dc, inside diameter dc and wall thickness Tc, instead of D, d and T for the relevant requirements in clauses 8.4.1.4, 10.2.2.2, 11.3, 11.8.1, 11.9, 11.11.4, 12.1 and Table 1, footnote c, Tables 4, 5, 8, 10, 13 and 14:

D_c = d + 2T    (1)
D_c = d_min + tolerance of. d_min + 2T      (2)
                                2
d_c = d_min + tolerance of. d_min        (3)
                               2
Tc = T_min + tolerance of. T_min    (4)
                              2

For tolerance see Tables 8, 9 and 10.
8.2.2 Product analysis
Option 3 : Product analysis for the tubes shall be supplied.
Table 3 specifies the permissible deviations of the product analysis from the specified limits on cast analysis given in Table 2.

Table 1 Heat treatment conditions

Steel grade

Heat treatment a

Austenizing

Tempering

Steel name

Steel number

Temperature °C

Cooling Medium

Temperature °C

Cooling Medium

P195GH

1.0348

+N b

880 to 940

Air

–

P235GH

1.0345

+N b

880 to 940

Air

–

P265GH

1.0425

+N b

880 to 940

Air

–

20MnNb6

1.0471

+N b

900 to 960

Air

–

16Mo3

1.5415

+N b

890 to 950

Air

–

8MoB5-4

1.545

+N b

920 to 960

Air

–

14MoV6-3

1.7715

+NT b c

930 to 990

Air

680 to730

air

10CrMo5-5

1.7338

+NT b c

900 to 960

Air

650 to 750

air

13CrMo4-5

1.7335

+NT b c

900 to 960

Air

660 to 730

air

10CrMo9-10

1.738

+NT b c

900 to 960

Air

680 to 750

air

11CrMo9-10

1.7383

+QT

900 to 960

Air or Liquid

680 to 750

air

25CrMo4

1.7218

+QT

860 to 900

Air or Liquid

620 to 680

air

20CrMoV13-5-5

1.7779

+QT

980 to 1030

Air or Liquid

680 to 730

air

15NiCuMoNb5-6-4

1.6368

+NT c

880 to 980

Air

580 to 680

air

X11CrMo5+I

1.7362+I

890 to 950

Furnace Atmosphere

–

X11CrMo5+NT1

1.7362+NT1

+NT1

930 to 980

Air

730 to 770

air

X11CrMo5+NT2

1.7362+NT2

+NT2 c

930 to 980

air

710 to 750

air

X11CrMo9-1+I

1.7386+I

950 to 980

Furnace Atmosphere

–

X11CrMo9-1+NT

1.7386+NT

+NT c

890 to 950

air

720 to 800

air

X10CrMoVNb9-1

1.4903

+NT c

1040 to 1090

air

730 to 780

air

X20CrMoV11-1

1.4922

+NT c

1020 to 1080

air

730 to 780

air

^a +N = Normalising, +NT = Normalising + Tempering, +QT = Quenching + Tempering (air or liquid), +I = Isothermal Annealing.

^b Normalising includes Normalising Forming.

^c For these steel grades it may be necessary in the case of wall thickness T above 25 mm or T/D > 0,15 to apply quenching and tempering in order to achieve the intended structure and material properties . The decision shall be left to the discretion of the manufacturer but shall be stated to the customer at the time of enquiry and order. Steel tubes treated in such a way shall be designated by the steel name supplemented by the symbol +QT .

Table 2 Chemical compposition (cast analysis)^a, in % by mass

Steel grade

Pmax

Smax

Almax

Ti max

Cr+Cu+Mo+Ni

Others

Steel name

Steel number

P195GH

1.0348

≤0.13

≤0.35

≤0.7

0.025

0.02

≤0.30

≤0.08

≤0.30

≥0.02^b

≤0.30^C

≤0.01^d

0.04^d

≤0.02^d

–

P235GH

1.0345

≤0.16

≤0.35

≤1.2

0.025

0.02

≤0.30

≤0.08

≤0.30

≥0.02^b

≤0.30^C

≤0.01^d

0.04^d

≤0.02^d

–

P265GH

1.0425

≤0.20

≤0.4

≤1.4

0.025

0.02

≤0.30

≤0.08

≤0.30

≥0.02^b

≤0.30^C

≤0.01^d

0.04^d

≤0.02^d

–

20MnNb6

1.0471

≤0.22

0.15 to 0.35

1.0 to 1.5

0.025

0.02

–

≤0.06

≤0.30^C

0.015 to 0.1

–

16Mo3

1.5415

0.12 to 0.2^e

≤0.35

0.4 to 0.9

0.025

0.02

≤0.30

0.25 to 0.35

≤0.30

≤0.04

≤0.30^C

–

B = 0.002 to 0.006

8MoB5-4

1.545

0.06 to 0.10

0.10 to 0.35

0.6 to 0.8

0.025

0.02

≤0.2

0.40 to 0.50

–

≤0.06

≤0.30^C

–

0.06

–

14MoV63

1.7715

0.10 to 0.15

0.15 to 0.35

0.4 to 0.7

0.025

0.02

0.3 to 0.6

0.5 to 0.7

≤0.30

≤0.04

≤0.30^C

–

0.22 to 0.28

–

10CrMo5-5

1.7338

≤0.15

0.5 to 1.0

0.3 to 0.6

0.025

0.02

1.0 to 1.5

0.45 to 0.65

≤0.30

≤0.04

≤0.30^C

–

13CrMo4-5

1.7335

0.10 to 0.17^e

≤0.35

0.4 to 0.7

0.025

0.02

0.7 to 1.15

0.40 to 0.60

≤0.30

≤0.04

≤0.30^C

–

10CrMo9-10

1.738

0.06 to 0.14

≤0.5

0.3 to 0.7

0.025

0.02

2.0 to 2.5

0.9 to 1.1

≤0.30

≤0.04

≤0.30^C

–

11CrMo9-10

1.7383

0.06 to 0.15

≤0.5

0.4 to 0.8

0.025

0.02

2.0 to 2.5

0.9 to 1.1

≤0.30

≤0.04

≤0.30^C

–

25CrMo4

1.7216

0.22 to 0.29

≤0.40

0.60 to 0.90

0.025

0.02

0.90 to 1.2

0.15 to 0.3

≤0.30

≤0.04

≤0.30^C

–

20CrMoV13-5-5

1.7779

0.17 to 0.23

0.15 to 0.35

0.30 to 0.50

0.025

0.02

3.0 to 3.3

0.5 to 0.6

≤0.30

≤0.04

≤0.30^C

–

0.45 to 0.55

–

15NiCuMoNb5-6-4

1.6368

≤0.17

0.25 to 0.50

0.80 to 1.20

0.025

0.02

≤0.30

0.25 to 0.5

1.0 to 1.3

≤0.05

0.5 to 0.8

0.15 to 0.045

–

X11CrMo5+1
X11CrMo5+NT1
X11CrMo5+NT2

1.7362+l
1.7362+NT1
1.7362+NT2

0.08 to 0.15

0.15 to 0.50

0.30 to 0.6

0.025

0.02

4.0 to 6.0

0.45 to 0.65

≤0.04

≤0.30^C

X11CrMo9-1+l
X11CrMo9-1+NT

1.7386+l
1.7386+NT

0.08 to 0.15

0.25 to 1.0

0.30 to 0.6

0.025

0.02

8.0 to 10.0

0.9 to 1.1

≤0.04

≤0.30^C

–

X10CrMoVNb9-1

1.4903

0.08 to 0.12

0.20 to 0.50

0.30 to 0.6

0.025

0.02

8.0 to 9.5

0.85 to 1.05

≤0.4

≤0.04

≤0.30^C

0.06 to 0.1

–

0.18 to 0.25

–

N=0.03 to 0.07

X20CrMoV11-1

1.4922

0.17 to 0.23

0.15 to 0.50

≤1.00

0.025

0.02

10.0 to 12.5

0.8 to 1.2

0.3 to 0.8

≤0.04

≤0.30^C

–

0.25 to 0.35

–

^a Element not included in this table shall not be intensionally to the steel without the agreenent of the purchaser, except for elements which may be added for finishing the cast. All appropriate shall be taken to prevent the addition of unsirable elements from scrap or other materialss used in the steel making process.
^b This requirement is not applicable provided steel contains a sufficient amont of then nitrogen binding elements which shall be reported. When using titanium, the producer shall verify that (Al+Ti)≥0.02%
^cOption 2: In order to faciliate subsequent forming operations, an agreed maximum copper content lower than indicated and an agreed specified maximum tin content shall apply
^dThe content of these elements need not to be reported unless intensionally added to the cast.
^eFor wall thickness≥30mm the carbon content may be increased by 0.02% for the cast and product analysis.
The upper carbon value of 0.23% shall not be exceeded for product analysis.

Table 3 Permissible deviations of the product analysis from specified limits on cast analysis given
in Table 2

Element

Limiting value for the cast analysis in accordance with Table 2 % by mass

Permissible deviation of the product analysis % by mass

≤0.29

±0.02

≤0.40

±0.05

>0.40 to ≤1.00

±0.06

≤1.00

±0.05

>1.00 to ≤1.50

±0.1

≤0.025

±0.005

≤0.10

±0.003

>0.01 ≤0.02

±0.005

≤0.06

±0.005

≤0.006

±0.001

≤1.00

±0.05

>1.00 to ≤ 10.00

±0.1

>10.00 to ≤ 12.5

±0.15

≤0.80

±0.05

≤0.35

±0.03

>0.35 to ≤1.20

±0.04

≤0.070

±0.01

≤0.10

±0.005

≤0.35

±0.05

>0.35 to ≤1.30

±0.07

≤0.060

±0.01

≤0.10

±0.01

>0.10 to ≤0.55

±0.03

8.3. Mechanical properties
8.3.1 Mechanical properties at and below room temperature
The mechanical properties at and below room temperature of the tubes shall conform to the requirements in Table 4 and in clauses 11.3, 11.4, 11.5 and 11.6.
8.3.2 Proof strength at elevated temperature
The minimum proof strength Rp0,2 values at elevated temperature are given in Table 5.
Option 6: Proof strength Rp0,2 shall be verified. The test temperature shall be specified at the time of enquiry and order.
8.3.3 Creep rupture strength
The creep rupture strength values are given in annex A for information
8.4. Appearance and internal soundness

Table 4 -Mechanical properties

Steel grade

Tensile properties at room temperature

Impact properties ^{a b}

Steel name

Steel number

Upper yield strength or proof strength R_eHfor wall thickness Tmin

Tensile strength Rm

Elongation A min.%a

Minimum average absorbed energy KV J at a temperature of °C

T≤16

16<T≤40

40<T≤60

60<T≤100

Mpa*

-10

P195GH

1.0348

195

–

320 to 440

–

40^C

28^d

–

27^C

P235GH

1.0345

235

225

215

–

360 to 500

–

40^C

28^d

–

27^C

P265GH

1.0425

265

255

245

–

410 to 570

–

40^C

28^d

–

27^C

20MnNb6

1.0471

355

345

335

–

500 to 650

40^C

–

27^C

16Mo3

1.5415

280

270

260

–

450 to 600

40^C

–

27^C

–

8MoB5-4

1.545

400

–

540 to 690

40^C

–

27^C

–

14MoV6-3

1.7715

320

310

–

460 to 610

40^CF

–

27^C

–

10CrMo5-5

1.7338

275

265

–

410 to 560

40^C

–

27^C

–

13CrMo4-5

1.7335

290

280

–

440 to 590

40^C

–

27^C

–

10CrMo9-10

1.738

280

270

–

480 to 630

40^C

–

27^C

–

11CrMo9-10

1.7383

355

–

540 to 680

40^C

–

27^C

–

25CrMo4

1.7218

345

–

541 to 690

40^CF

–

27^C

–

20CrMoV13-5-5

1.7779

590

–

740 to 880

40^CF

–

27^C

–

15NiCuMoNb5-6-4

1.6368

440

440^e

610 to 780

40^CF

–

27^C

–

X11CrMo5+l

1.7362+l

175

430 to 580

40^C

–

27^C

–

X11CrMo5+NT1

1.7362+NT1

280

480 to 640

40^C

–

27^C

–

X11CrMo5+NT2

1.7362+NT2

390

570 to 740

40^C

–

27^C

–

X11CrMo9-1+l
X11CrMo9-1+NT

1.7386+l

210

–

460 to 640

40^C

–

27^C

–

X11CrMo9-1+NT

1.7386+NT

390

–

590 to 740

40^C

–

27^C

–

X10CrMoVNb9-1

1.4903

450

630 to 830

40^CF

–

27^C

–

X20CrMoV11-1

1.4922

490

690 to 840

40^CF

–

27^C

^a l = longitudinal t = transverse
^b To be verified when options 4 and/or 5 are/is specified, unless footnote f) applies.
^cOption 4: Impact energy shall be verified.
^d Option 5: Longitudinal impact energy shall be verified.
^eFor wall thickness 60mm <T≤80 mm.
^fImpact test mandatory for wall thickness T≥1600.
MPa = 1N/m²

Table 5: Minimum proof strength R_p0.2at elevated temperature

Steel grade

Wall thickness mm

Minimum proof strength R_p0.2Mpa^aat temperature of °C

Steel name

Steel number

100

150

200

250

300

350

400

450

500

550

600

P195GH

1.0348

≤16

175

165

150

130

113

102

–

P235GH

1.0345

≤60

198

187

170

150

132

120

112

108

–

P265GH

1.0425

≤60

226

213

192

171

154

141

134

126

–

20MnNb6

1.0471

≤60

312

292

264

241

219

200

186

174

–

16Mo3

1.5415

≤60

243

237

224

205

173

159

156

150

146

–

8MoB5-4

1.5450

≤60

368

–

14MoV6-3

1.7715

≤60

282

276

267

241

225

216

209

203

200

197

–

10CrMo5-5

1.7338

≤60

240

228

219

208

165

156

148

144

143

–

13CrMo4-5

1.7335

≤60

264

253

245

236

192

182

174

168

166

–

10CrMo9-10

1.7380

≤60

249

241

234

224

219

212

207

193

180

–

11CrMo9-10

1.7383

≤60

323

312

304

296

289

280

275

257

239

–

25CrMo4

1.7218

≤60

–

315

305

295

285

265

225

185

–

20CrMoV13-5-5

1.7779

≤60

–

575

570

560

550

510

470

420

370

–

15NiCuMoNb5-6-4

1.6368

≤80

422

412

402

392

382

373

343

304

–

X11CrMo5+l

1.7362+l

≤100

156

150

148

147

145

142

137

129

116

–

X11CrMo5+NT1

1.7362+NT1

≤100

245

237

230

223

216

206

196

181

167

–

X11CrMo5+NT2

1.7362+NT2

≤100

366

350

334

332

309

299

269

280

265

–

X11CrMo9-1+l

1.7386+l

≤60

187

186

178

177

175

171

164

153

142

120

–

X10CrMoVNb9-1+NT

1.7386+NT

≤60

363

348

334

330

326

322

316

311

290

235

–

X10CrMoVNb9-1

1.4903

≤100

410

395

380

370

360

350

340

320

300

270

215

X20CrMoV11-1

1.4922

≤100

–

430

415

390

380

360

330

290

250

^a1 Mpa = 1 N/mm²

8.4 Appearance and internal soundness
8.4.1 Appearance
8.4.1.1 The tubes shall be free from external and internal surface defects that can be detected by visual examination.
8.4.1.2 The internal and external surface finish of the tubes shall be typical of the manufacturing process and, where applicable, the heat treatment employed. Normally the finish and surface condition shall be such that any surface imperfections requiring dressing can be identified.
8.4.1.3 It shall be permissible to dress, only by grinding or machining, surface imperfections provided that, after doing so, the wall thickness in the dressed area is not less than the specified minimum wall thickness. All dressed areas shall blend smoothly into the contour of the tube.
8.4.1.4 Any surface imperfection, which is demonstrated to be deeper than 5 % of the wall thickness T or 3 mm whichever is the smaller, shall be dressed. This requirement does not apply to surface imperfection with a depth equal or less 0,3 mm
8.4.1.5 Surface imperfections which encroach on the specified minimum wall thickness shall be considered defects and tubes containing these shall be deemed not to conform to this Part of EN 10216.
8.4.2 Internal soundness
8.4.2.1 Leak Tightness
The tubes shall pass a hydrostatic test (see 11.8.1) or electromagnetic test (see 11.8.2) for leak-tightness. Unless option 7 is specified, the choice of the test method is at the discretion of the manufacturer. Option 7: The test method for verification of leak-tightness in accordance with 11.8.1 or 11.8.2 is specified by the purchaser.
8.4.2.2 Non-Destructive Testing
The tubes of test category 2 shall be subjected to a non-destructive testing for the detection of longitudinal imperfections, in accordance with11.11.1. Option 8: The tubes of test category 2 shall subjected to a non-destructive testing for the detection of transverse imperfections in accordance with11.11.2. Option 9: The tubes of test category 2 shall be subjected to a non-destructive testing for the detection of the laminar imperfections in accordance with11.11.3.
8.5 Straightness
The deviation from straightness of any tube length L shall not exceed 0,0015 L. Deviations from straightness over any one metre length shall not exceed 3 mm.
8.6 Preparation of ends
Tubes shall be delivered with square cut ends. The ends shall be free from excessive burrs. Option10: The tubes shall be delivered with bevelled ends (see figure 1). The bevel shall have an angle of 30° 05 with a root face C of 1,6 mm 0,8 mm, except that for wall thickness T greater than 20 mm, an agreed alternative bevel may be specified
8.7 Dimensions, masses and tolerances
8.7.1 Diameter and wall thickness
Unless option 11 is specified, tubes shall be delivered by outside diameter D and wall thickness T. Preferred outside diameters D and wall thicknesses T have been selected from ENV 10220 and are given in
Table 6. NOTE Dimensions which are different from those in Table 6 may be agreed.
Option 11: The tubes shall be delivered in accordance withone of the following sets of dimensions as specified at the time of enquiry and order: outside diameter D and minimum wall thickness Tmin; inside diameter d and wall thickness T for d 220 mm; inside diameter d and minimum wall thickness Tmin for d 220 mm; minimum inside diameter dmin and wall thickness T for dmin 220 mm; minimum inside diameter dmin and minimum wall thickness Tmin for dmin 220 mm.

Table 6 Preferred dimensions

dimensions in mm

Outside
diameter D
Series^a

Wall thickness T

1.6

1.8

2.3

2.6

2.9

3.2

3.6

4.5

5.6

6.3

7.1

8.8

12.5

14.2

10.2

12.7

13.5

17.2

21.3

25.4

26.9

31.8

33.7

42.4

44.5

48.3

60.3

63.5

76.1

82.5

88.9

101.6

108

114.3

127

133

139.7

141.3

152.4

159

168.3

177.8

193.7

219.1

244.5

273

323.9

355.6

406.4

457

508

559

610

660

711

Outside
diameter D
Series^a

Table 5 Preferred dimensions
dimensions in mm

17.5

22.2

100

10.2

12.7

13.5

17.2

21.3

25.4

26.9

31.8

33.7

42.4

44.5

48.3

60.3

63.5

76.1

82.5

88.9

101.6

108

114.3

127

133

139.7

141.3

152.4

159

168.3

177.8

193.7

219.1

244.5

273

323.9

355.6

406.4

457

508

559

610

660

711

^aseries 1 = diameters for which all the accessories needed for the construction of piping system are standardized;
series 2 = diameters for which not all the accessories are standardized;
series 3 = diameters for special application for which very few standardized accessories exist.

8.7.2 Mass
For the mass per unit length the provisions of ENV 10220 apply except that for the steel grade X11CrMo9-1+I, X11CrMo9-1+NT, X10CrMoVNb9-1 and X20CrMoV11-1 a density of 7,77 kg/dm3 shall be used.
8.7.3 Lengths
Unless option 12 is specified, the tubes shall be delivered in random length. The delivery length range shall be agreed at the time of enquiry and order. Option 12: The tubes shall be delivered in exact lengths and the length shall be specified at the time of enquiry and order. For the tolerances see 8.7.4.2.
8.7.4 Tolerances
8.7.4.1 Tolerances on diameter and thickness
The diameter and the wall thickness of the tubes shall be within the relevant tolerance limits given in Tables 7,8, 9, 10 or 11. Out of roundness is included in the tolerances on diameter and eccentricity is included in the tolerances on wall thickness.

Table 7: Tolerance on outside diameter and wall thickness

Outside Diameter D mm

Tolerances on D

Tolerance on T for a T/D ratio

≤0.025

>0.025≤0.050

>0.050≤ 0.10

>0.10

D ≤ 219.1

±1 % or ±0.5mm whichever is the greater

± 12,5% or ± 0.4mm whichever is the greater

D > 219.1

± 20%

± 15%

± 12.5%

± 10%^a

^aFor outside diameters D≥ 355,6 mm it is permitted to exceed the upper wall thickness locally by a further 5% of the
wall thickness T

Table 8: Tolerance on inside diameter and wall thickness

Tolerances on inside diameter

Tolerances on T for a T/d ratio

d_min

≤0.03

>0.03≤0.06

>0.06≤ 0.12

>0.12

± 1% or ± 2mm whichever is the greater

±2% + 4 mm whichever or is the greater

± 20%

± 15%

± 12.5%

± 10%^a

^aFor outside diameters D≥ 355,6 mm it is permitted to exceed the upper wall thickness locally by a further 5% of the
wall thickness T

Table 9 : Tolerances on outside diameter and minimum wall thickness

Outside Diameter D mm

Tolerances on D

Tolerance on T for a T/D ratio

≤0.02

>0.02≤0.040

>0.040≤ 0.09

>0.09

D ≤ 219.1

±1 % or ±0.5mm whichever is the greater

+28% or +0.8 mm whichever is the greater

D > 219.1

± 50%

± 35%

± 28%

± 22%^a

^aFor outside diameters D≥ 355,6 mm it is permitted to exceed the upper wall thickness locally by a further 5% of the
wall thickness T

Table 10 Tolerances on inside diameter and minimum wall thickness

Tolerances on inside diameter

Tolerances on T_minfor a T_min/d ratio

d_min

≤0.05

>0.05≤0.1

>0.1

± 1% or ± 2mm whichever is the greater

±2% + 4 mm whichever or is the greater

± 35%

± 28%

± 22%^a

^aFor outside diameters D≥ 355,6 mm it is permitted to exceed the upper wall thickness locally by a further 5% of the
wall thickness T

Table 11 Tolerances on outside diameter and wall thickness for tube ordered cold finished

Tolerance on D

Tolerance on T

±0.5% or ± 0.3 mm whichever or is the greater

± 10% or ± 0.2 mm whichever or is the greater

8.7.4.2 Tolerances on exact lengths
The tolerances for exact lengths shall be as given in Table 12.

Table 12 Tolerances on exact lengths

Dimension in mm

Length L

Tolerance on exact length

L ≤ 6000

+10%

6000 < L ≤ 12000

+15%

L > 12000

+ by agreement

9 INSPECTION
9.1 Types of inspection
Conformity to the requirements of the order, for tubes in accordance with this Part of EN 10216, shall be checked by specific inspection. When an inspection document 3.1.B is specified the material manufacturer shall state in the confirmation of the order whether he is operating according to a quality-assurance system, certified by a competent Body established within the Community and having undergone a specific assessment for materials. NOTE See the Directive 97/23/EC Annex I section 4.3 third paragraphò
9.2 Inspection documents
9.2.1 Types of inspection documents
Unless option 13 is specified, an inspection certificate 3.1.B, in accordance with EN 10204, shall be issued. Option 13: One of the inspection documents 3.1.A, 3.1.C or 3.2 in accordance with EN 10204 shall be issued If an inspection document 3.1.A, 3.1.C or 3.2 is specified, the purchaser shall notify the manufacturer of the name and address of the organisation or person who is to carry out the inspection and produce the inspection document. In the case of the inspection report 3.2 it shall be agreed which party shall issue the certificate.
NOTE Document 3.1.A is not acceptable for compliance with the Directive 97/23/EC
9.2.2 Content of inspection documents
The content of the inspection document shall be in accordance with prEN 10168. In all types of inspection documents a statement on the conformity of the products delivered with the
requirements of this specification and the order shall be included. The inspection certificate or inspection report shall contain the following codes and information:
A commercial transactions and parties involved;
B description of products to which the inspection document applies;
C02-C03 direction of the test pieces and testing temperature;
C10-C13 tensile test;
C40-C43 impact test if applicable;
C60-C69 other tests;
C71-C92 chemical composition on cast analysis (product analysis if applicable);
D01 marking and identification, surface appearance, shape and dimensional properties;
D02-D99 leak-tightness test; NDT, material identification if applicable;
Z validation.
In addition for inspection document 3.1.B the manufacturer shall state the references to the certificate (see 9.1) of the appropriate quality-assurance system, if applicable.
9.3 Summary of inspection and testing
Non-alloy steel tubes shall be inspected and tested in accordance with test category 1 or test category 2 as specified at the time of inquiry and order (see 6.1).
Alloy steel tubes shall be inspected and tested in accordance with test category 2 (see Table 13). Inspection and testing to be carried out are summarised in Table 13.

Table 13 Summary of inspection and testing

Type of inspection and test

Fequency of testing

Refer to

Test category TC

Mandatory tests

Cast analysis

One per cast

8.2.1-11.1

Tensile test at room temperature

One per
sample tube

8.3.1-11.2.1

Flattening test for D < 600 mm and T/D ratio ≤ 0.15 but T ≤ 40 mm or ^aRing expanding
test for D > 150 mm and T ≤ 40 mm

8.3-11.3-11.4

Drift expanding test for D ≤ 150 mm amd T ≤ 10 mm or ^{a b}Ring expanding test for D ≤ 114.3 mm and T ≤ 12.5 mm

8.3-11.5-11.6

Impact test at 20° C for Group A^c

8.3-11.7

Leak tightness test

Each tube

8.4.2.1-11.8

Dimensional inspection

8.7.1-11.9

Visual examination

11.1

NDT for the detection of longitudinal imperfections

Each tube

8.4.2.2-11.11.1

—

Material identification of alloy steels

11.12

Optional tests

Product analysis (Option 3)

One per cast

8.2.2-11.1

Tensile test at elevated temperature (Option 6)

One per cast and same heat treatment condition

8.3.2-11.22

Impact test for Group B ^c(Option 4)

One per
sample tube

8.3-11.7

Longitudinal impact test at-10°C for non-alloy steel grades (Option 5)

8.3-11.7

Wall thickness measurement away from tube ends (Option 15)

8.7.1-11.9

NDT for the detection of transverse imperfections (Option 8)

Each tube

8.4.2.2-11.11.2

—

NDT for the detection of laminar imperfections (Option 9)

8.4.2.2-11.11.3

—

^a The choice of flattening or ring tensile test and of drift expanding test or ring expanding test is at the manufacturers discretion.
^b For steel grades X10CrMoVNb9-1 and X20CrMoV11-1 tubes, the flattening or ring tensile test and the drift expanding test or ring expanding test shall be carried out at one end of 20 % of the tubes of each test unit.
^c Group A: tubes having wall thickness T 16 mm manufactured from steel grades 14MoV6-3, 25CrMo4, 20CrMoV13-5-
5, 15NiCuMoNb5-6-4, X10CrMoVNb9-1 and X20CrMoV11-1
Group B: All tubes except group A

10 SAMPLING
10.1 Frequency of tests
10.1.1 Test unit
For normalised formed tubes a test unit shall comprise tubes of the same specified diameter and wall thickness, the same steel grade, the same cast, the same manufacturing process.EN 10216-2:2002 (E) For tubes which are furnace heat treated a test unit shall comprise tubes of the same specified diameter and
wall thickness, the same steel grade, the same cast, the same manufacturing process, subjected to the same finishing treatment in a continuous furnace or heat treated in the same furnace charge in a batch-type furnace. The number of tubes per test unit shall conform to Table 14.

Table 14 Number of tubes per test unit

Outside diameter D
mm

Maximum number of tubes per test unit

D ≤ 114.3

200

114.3 < D ≤ 323.9

100

D > 323.9

10.1.2 Number of sample tubes per test unit
The following number of sample tubes shall be selected from each test unit : test category 1: one sample tube; test category 2: two sample tubes; when the total number of tubes is less than 20, only one sample tube
10.2 Preparation of samples and test pieces
10.2.1 Selection and preparation of samples for product analysis
Samples for product analysis shall be taken from the test pieces or samples for mechanical testing or from the whole thickness of the tube at the same location as the mechanical test samples, in accordance with ISO 14284.
10.2.2 Location, orientation and preparation of samples and test pieces for mechanical test
10.2.2.1 General
Samples and test pieces shall be taken at the tube ends and in accordance with the requirements of EN ISO 377.
10.2.2.2 Test pieces for tensile tests
The test pieces for the tensile tests at room temperature shall be prepared in accordance with EN 10002-1. The test piece for the tensile tests at elevated temperature shall be prepared in accordance with EN 10002-5. At the manufacturer's discretion: for tubes with an outside diameter D 219,1 mm the test piece shall be either a full tube section or a strip section and shall be taken in a direction longitudinal to the axis of the tube; for tubes with an outside diameter D 219,1 mm the test piece shall either a machined test piece with circular cross section from an unflattened sample or a strip section and be taken in a direction either longitudinal or transverse to the axis of the tube.
10.2.2.3 Test pieces for flattening test, ring tensile test, drift expanding test and ring expanding test
The test pieces for the flattening test, ring tensile test, drift expanding test and the ring expanding test shall consist of a full tube section in accordance with EN 10233, EN 10237, EN 10234 or EN 10236 respectively.
10.2.2.4 Test pieces for impact test
Three standard Charpy V-notch test pieces shall be prepared in accordance with EN 10045-1. If the wall thickness is such that standard test pieces cannot be produced without flattening of the section, then test pieces of width less than 10 mm, but not less than 5 mm shall be prepared; the largest obtainable width shall be used. Where test pieces of least 5 mm width cannot be obtained, the tubes shall not be subjected to impact testing. Unless otherwise specified (see Option 5), the test pieces shall be taken transverse to the tube axis unless Dmin , as calculated by the following equation, is greater than the specified outside diameter, in which case longitudinal test pieces shall be used:
Dmin = (T-5) + 756,25 / (T-5) (5)
The test pieces shall be prepared such that the axis of the notch is perpendicular to the surface of the tube, see Figure 2.
1) Longitudinal test piece
2) Transverse test piece

11 TEST METHODS
11.1 Chemical analysis
The elements to be determined and reported shall be those specified in Table 2. The choice of a suitable
physical or chemical analytical method for the analysis shall be at the discretion of the manufacturer. In case of
dispute the method used shall be agreed between manufacturer and purchaser taking into account CR 10261.
11.2 Tensile test
11.2.1 Tensile test at room temperature
The test shall be carried out at room temperature in accordance with EN 10002-1, and the following determined:
the tensile strength (Rm); the upper yield strength (ReH) or if a yield phenomenon is not present the 0,2 % proof strength (Rp0,2);EN 10216-2:2002 (E) the percentage elongation after fracture with a reference to a gauge length ( L0) of 5,65 So ; if a nonproportional test piece is used, the percentage elongation value shall be converted to the value for a gauge length Lo 5,65 So using the conversion Tables in EN ISO 2566-1.
11.2.2 Tensile test at elevated temperature
The test shall be carried out in accordance with EN 10002-5 at the temperature agreed at the time of enquiry
and order (see 6.2) and the proof strength (Rp0,2) shall be determined.
11.3 Flattening test
The test shall be carried out in accordance with EN 10233. The tube section shall be flattened in a press until the distance H between the platens reaches the value given by the following equation:
where : H ={ (L + C)/C + (T/D)}xT (6)
H is the distance between platens, in mm, to be measured under load;
D is the specified outside diameter, in mm;
T is the specified wall thickness, in mm;
C is the constant factor of deformation (given in Table 15).

Table 15 Flattening test – Constant factor of deformation C

Steel grade

Steel name

Steel number

Steel name

Steel number

P195GH

1.0348

0.09

25CrMo4

1.7218

0.06

P235GH

1.0345

0.09

20CrMoV13-5-5

1.7779

0.05

P265GH

1.0425

0.07

15NiCuMoNb5-6-4

1.6368

0.05

20MnNb6

1.0471

0.07

X11CrMo5+l

1.7362+l

0.05

16Mo3

1.5415

0.07

X11CrMo5+NT1

1.7362+NT1

0.05

8MoB5-4

1.5450

0.05

X11CrMo5+NT2

1.7362+NT2

0.05

14MoV6-3

1.7715

0.05

X11CrMo9-1+l

1.7386+l

0.05

10CrMo5-5

1.7338

0.08

X10CrMoVNb9-1+NT

1.7386+NT

0.05

13CrMo4-5

1.7335

0.07

X10CrMoVNb9-1

1.4903

0.05

10CrMo9-10

1.7380

0.07

X20CrMoV11-1

1.4922

0.05

11CrMo9-10

1.7383

0.07

After testing, the test piece shall be free from cracks or breaks. However, slight incipient cracks at its edges shall not be regarded as justification for rejection.
11.4 Ring tensile test
The test shall be carried out in accordance with EN 10237. The tube section shall be subjected to strain in the circumferential direction until fracture occurs. After fracture the test pieces shall not show any visible cracks without the use of magnifying aids (excluding the fracture point).
11.5 Drift expanding test
The test shall be carried out in accordance with EN 10234. The tube section shall be expanded with a 60° conical tool until the percentage increase in outside diameter shown in Table 16 is reached.

Table 16 Drift expanding test requirements

Steel grade

% increase in outside diameter for d/D ^a

Steel name

Steel number

≤ 0.6

> 0.6 ≤ 0.8

> 0.8

P195GH

1.0348

P235GH

1.0345

P265GH

1.0425

20MnNb6

1.0471

16Mo3

1.5415

8MoB5-4

1.5450

14MoV6-3

1.7715

10CrMo5-5

1.7338

13CrMo4-5

1.7335

10CrMo9-10

1.7380

11CrMo9-10

1.7383

25CrMo4

1.7218

20CrMoV13-5-5

1.7779

15NiCuMoNb5-6-4

1.6368

X11CrMo5+l

1.7362+l

X11CrMo5+NT1

1.7362+NT1

X11CrMo5+NT2

1.7362+NT2

X11CrMo9-1+l

1.7386+l

X10CrMoVNb9-1+NT

1.7386+NT

X10CrMoVNb9-1

1.4903

X20CrMoV11-1

1.4922

^a d = D – 2T

After testing, the test piece shall be free from cracks or breaks. However, slight incipient cracks at its edges
shall not be regarded as justification for rejection.
11.6 Ring expanding test
The test shall be carried out in accordance with EN 10236. The tube section shall be expanded with a conical tool until it breaks. The surface outside the fracture zone shall be free from cracks or breaks. However, slight incipient cracks at its edges shall not be regarded as justification for rejection.
11.7 Impact test
11.7.1 The test shall be carried out in accordance with EN 10045-1 at the temperature given in Table 4.
11.7.2 The mean value of the three test pieces shall meet the requirements given in Table 4. One individual value may be below the specified value, provided that it is not less than 70 % of that value.
11.7.3 If the width (W) of the test piece is less than 10 mm, the measured impact energy (KVp) shall be converted to the calculated impact energy(KVc) using the following equation:
where:
KVc is the calculated impact energy, in J;
p is the measured impact energy, in J;
W is the width of the test piece, in mm.
The calculated impact energy KVc shall conform to the requirements given in 11.7.2.
11.7.4 If the requirements of 11.7.2 are not met, then an additional set of three test pieces may be taken at the discretion of the manufacturer from the same sample and tested. To consider the test unit as conforming, after testing the second set, the following conditions shall be satisfied simultaneously:
the average value of the six tests shall be equal to or greater than the specified minimum average value; not more than two of the six individual values may be lower than the specified minimum average value; not more than one of the six individual values may be lower than 70 % of the specified minimum average value.
11.7.5 The dimensions in millimetres of the test pieces, the measured impact energy values and the resulting average value shall be reported.
11.8 Leak tightness test
11.8.1 Hydrostatic test
The hydrostatic test shall be carried out at a test pressure of 70 bar 2) or at a test pressure P calculated using the following equation, whichever is lower:
where :
P is the test pressure, in bar;
D is the specified outside diameter, in mm;
T is the specified wall thickness, in mm;
S is the stress, in MPa, corresponding to 70 % of the specified minimum yield strength (see Table 4) for the steel grade concerned. The test pressure shall be held for not less than 5 s for tubes with an outside diameter D less than or equal to 457 mm and for not less than 10 s for tubes with an outside diameter D greater than 457 mm. The tube shall withstand the test without showing leakage or visible deformation. NOTE This hydrostatic leak-tightness test is not a strength test. Option 14: A test pressure different from that specified in 11.8.1 and corresponding to stresses below 90% of the specified minimum yield strength (see Table 4) for the steel grade concerned is specified.
11.8.2 Electromagnetic test
The test shall be carried out in accordance with EN 10246-1.
11.9 Dimensional inspection
Specified dimensions, including straightness, shall be verified. The outside diameter shall be measured at tube ends. For tubes with outside diameter D 406,4 mm, the diameter may be measured using a circumference tape. Unless option 15 is specified the wall thickness shall be measured at both tube ends.
Option 15: The wall thickness shall be measured away from the tube ends in accordance withan agreed procedure.
11.10 Visual examination
Tubes shall be visually examined to ensure conformity to the requirements of 8.4.1.
11.11 Non-destructive testing
11.11.1 Tubes of test category 2 shall be subjected to a Non-Destructive Testing for the detection of longitudinal imperfections, in accordance with EN 10246-7, to acceptance level U2, sub-category C or EN
10246-5 acceptance level F2. Unless option 16 is specified, the selection of the test method is at the discretion of the manufacturer. Option 16: The test method is specified by the purchaser. Regions at the tube ends not automatically tested shall either be subjected to manual/semi-automatic ultrasonic testing in accordance with EN 10246-7 to acceptance level U2, sub-category C or be cropped off.
11.11.2 If option 8 is specified (see 8.4.2.2), the tubes shall be subjected to ultrasonic testing for the detection of transverse imperfections in accordance with EN 10246-6 to acceptance level U2, sub-category C.
11.11.3 If option 9 is specified (see 8.4.2.2), the tubes shall be subjected to ultrasonic testing for the detection of the laminar imperfections in accordance with EN 10246-14 to acceptance level U2.
11.11.4 For tubes ordered by minimum wall thickness Tmin (see option 11), the acceptance level shall apply to the calculated wall thickness Tc as determined in accordance with the formula stated in clause 8.1.
11.12 Material identification
Each tube made from alloy steel (see 5.1) shall be tested by an appropriate method to ensure that the correct grade is being supplied.
11.13 Retests, sorting and reprocessing
For retest, sorting and reprocessing the requirements of EN 10021 shall apply.

12 MARKING
12.1 Marking to be applied
The marking shall be indelibly marked on each tube at least at one end. For tubes with outside diameter D 51mm the marking on tubes may be replaced by the marking on a label attached to the bundle or box. The marking shall include the following information: the manufacturer's name or trade mark ;
the number of this European standard and the steel name (see 5.2); the test category in case of non-alloy steel grades; the cast number or a code number; the mark of the inspection representative; an identification number (e.g. order or item number) which permits the correlation of the product or delivery unit to the related document. Example of marking:
X – EN 10216-2 – P265GH – TC1 – Y- Z1 – Z2
where:
X is the manufacturer's mark;
TC1 is the designation of the test category 1;
Y is the cast number or a code number;
Z1 is the mark of the inspection representative;
Z2 is the identification number.
12.2 Additional marking
Option 17: Additional marking, as agreed upon at the time of enquiry and order, shall be applied.

13 PROTECTION
The tubes shall be delivered without a temporary protective coating.
Option 18: A temporary protective coating or durable coating and/or lining shall be applied.

Creep rupture strength values
The creep rupture strength values of steel grades covered by this Part of EN 10216 are given in Table A1.

Table 17 Creep rupture strength values

Steel grade

Temperature °C

Creep rupture strength values for (MPa ) a b c d

Steel name

Steel number

10 000 h

100 000 h

200 000 h

250 000 h

P235GH
P265GH

400

182

141

128

122

410

166

128

115

109

420

151

114

102

430

138

100

440

125

450

112

460

100

470

480

490

—

500

—

20MnNb6

400

243

179

157*

150*

410

221

157

135*

128*

420

200

136

115*

108*

430

180

117

97*

91*

440

161

100

82*

77*

450

143

70*

66*

460

126

60*

56*

470

110

52*

48*

480

44*

41*

490

37*

32*

500

—

16Mo3

450

298

236

218

210

460

273

205

188

179

470

247

176

158

148

480

221

149

129

122

490

196

124

105

500

171

102

510

148

520

125

530

104

540

—

550

—

14MoV6-3

450

377

305

282

275

460

349

276

255

247

470

324

249

226

220

480

298

224

202

195

490

274

200

179

171

500

249

177

158

150

510

225

155

136

129

520

203

135

117

110

530

181

117

101

540

162

102

550

143

560

126

570

112

580

590

600

10CrMo5-5
13CrMo4-5

450

377

290

264

257

460

347

258

233

225

470

319

227

203

193

480

292

198

175

164

490

264