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| Designation: A 335/A 335M – 03 | |||||||||||||||||||||
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Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service This standard is issued under the fixed designation A 335/A 335M; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense |
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| Chemical Requirements | |||||||||||||||||||||
| Grade |
UNS Designation A |
Composition, % | |||||||||||||||||||
| Carbon | Manganese |
Phosphorus, max |
Sulfur, max |
Silicon | Chromium | Molybdenum | Others | ||||||||||||||
| P1 | K11522 | 0.10–0.20 | 0.30–0.80 | 0.025 | 0.025 | 0.10–0.50 | … | 0.44–0.65 | … | ||||||||||||
| P2 | K11547 | 0.10–0.20 | 0.30–0.61 | 0.025 | 0.025 | 0.10–0.30 | 0.50–0.81 | 0.44–0.65 | … | ||||||||||||
| P5 | K41545 | 0.15 max | 0.30–0.60 | 0.025 | 0.025 | 0.50 max | 4.00–6.00 | 0.44–0.65 | … | ||||||||||||
| P5b | K51545 | 0.15 max | 0.30–0.60 | 0.025 | 0.025 | 1.00–2.00 | 4.00–6.00 | 0.44–0.65 | … | ||||||||||||
| P5c | K41245 | 0.12 max | 0.30–0.60 | 0.025 | 0.025 | 0.50 max | 4.00–6.00 | 0.44–0.65 | … | ||||||||||||
| P9 | S50400 | 0.15 max | 0.30–0.60 | 0.025 | 0.025 | 0.25–1.00 | 8.00–10.00 | 0.90–1.10 | … | ||||||||||||
| P11 | K11597 | 0.05–0.15 | 0.30–0.60 | 0.025 | 0.025 | 0.50–1.00 | 1.00–1.50 | 0.44–0.65 | … | ||||||||||||
| P12 | K11562 | 0.05–0.15 | 0.30–0.61 | 0.025 | 0.025 | 0.50 max | 0.80–1.25 | 0.44–0.65 | … | ||||||||||||
| P15 | K11578 | 0.05–0.15 | 0.30–0.60 | 0.025 | 0.025 | 1.15–1.65 | … | 0.44–0.65 | … | ||||||||||||
| P21 | K31545 | 0.05–0.15 | 0.30–0.60 | 0.025 | 0.025 | 0.50 max | 2.65–3.35 | 0.80–1.06 | … | ||||||||||||
| P22 | K21590 | 0.05–0.15 | 0.30–0.60 | 0.025 | 0.025 | 0.50 max | 1.90–2.60 | 0.87–1.13 | … | ||||||||||||
| P23 | K41650 | 0.04–0.10 | 0.10–0.60 | 0.030 max | 0.010 max | 0.50 max | 1.90–2.60 | 0.05–0.30 |
V 0.20–0.30 Cb 0.02–0.08 B 0.0010–0.006 N 0.015 max Al 0.030 max W 1.45–1.75 Ni 0.40 max Ti 0.005–0.060 Ti/N ≥ 3.5C |
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| P24 | K30736 | 0.05–0.10 | 0.30–0.70 | 0.02 | 0.01 | 0.15–0.45 | 2.20–2.60 | 0.90–1.10 |
V 0.20–0.30 Ti 0.06–0.10 N 0.012 max Al 0.02 max B 0.0015–0.007 |
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| P36 | K21001 | 0.10–0.17 | 0.80–1.20 | 0.030 max | 0.025 max | 0.25–0.50 | 0.30 max | 0.25–0.50 |
Ni 1.00-1.30 Cu 0.50-0.80 Cb 0.015-0.045 V 0.02 max N 0.02 max Al 0.050 max |
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| P91 | K91560 | 0.08–0.12 | 0.30–0.60 | 0.020 | 0.010 | 0.20–0.50 | 8.00–9.50 | 0.85–1.05 |
V 0.18–0.25 N 0.030–0.070 Ni 0.40 max Al 0.02 max Cb 0.06–0.10 Ti 0.01 max Zr 0.01 max |
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| P92 | K92460 | 0.07–0.13 | 0.30–0.60 | 0.020 | 0.010 | 0.50 max | 8.50–9.50 | 0.30–0.60 |
Zr 0.01 max V 0.15–0.25 N 0.03–0.07 Ni 0.40 max Al 0.02 max Cb 0.04–0.09 W 1.5–2.00 B 0.001–0.006 Ti 0.01 max Zr 0.01 max |
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| P122 | K92930 | 0.07–0.14 | 0.70 max | 0.020 | 0.010 | 0.50 max | 10.00–12.50 | 0.25–0.60 |
V 0.15–0.30 W 1.50–2.50 Cu 0.30–1.70 Cb 0.04–0.10 B 0.0005–0.005 N 0.040–0.100 Ni 0.50 max Al 0.020 max Ti 0.01 max Zr 0.01 max |
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| P911 | K91061 | 0.09–0.13 | 0.30–0.60 | 0.020 max | 0.010 max | 0.10–0.50 | 8.50–10.50 | 0.90–1.10 |
V 0.18–0.25 Ni 0.40 max Cb 0.060–0.10 B 0.0003–0.006 N 0.04–0.09 Al 0.02 max W 0.90–1.10 Ti 0.01 max Zr 0.01 max |
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| Materials and Manufacture | |||||||||||||||||||||
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Pipe may be either hot finished or cold drawn with the finishing treatment as required in Heat Treatment: All pipe shall be reheated for heat treatment and heat treated in accordance with the requirement. It is recommended that the temperature for tempering should be at least 100 °F [50 °C] above the intended service temperature; consequently, the purchaser should advise the manufacturer if the service temperature is to be over 1100 °F [600 °C]. Certain of the ferritic steels covered by this specification will harden if cooled rapidly from above their critical temperature. Some will air harden, that is, become hardened to an undesirable degree when cooled in air from high temperatures. Therefore, operations involving heating such steels above their critical temperatures, such as welding, flanging, and hot bending, should be followed by suitable heat treatment |
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| Heat Treatment RequirementsA | |||||||||||||||||||||
| Grade | Heat Treat Type |
Normalizing Temperature, min or range °F [°C] |
Cooling Media |
Subcritical Annealing or Tempering Temperature, min or range°F [°C |
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| P1 |
full or isothermal anneal normalize and temper subcritical anneal |
… | … | 1200 [650] 1200-1300 [650-705] | |||||||||||||||||
| P2 |
full or isothermal anneal normalize and temper subcritical anneal |
… | … | 1250 [675] 1200-1300 [650-705] | |||||||||||||||||
| P5 |
full or isothermal anneal normalize and temper |
… | … | 1250 [675] | |||||||||||||||||
| P5b |
full or isothermal anneal normalize and temper |
… | … | 1250 [675] | |||||||||||||||||
| P5c | subcritical anneal | … | … | 1325-1375 [715-745] | |||||||||||||||||
| P9 |
full or isothermal anneal normalize and temper |
… | … | 1250 [675] | |||||||||||||||||
| P11 |
full or isothermal anneal normalize and temper |
… | … | 1200 [650] | |||||||||||||||||
| P12 |
full or isothermal anneal normalize and temper subcritical anneal |
… | … | 1200 [650] 1200-1300 [650-705] | |||||||||||||||||
| P15 |
full or isothermal anneal normalize and temper |
… | … | 1200 [650] | |||||||||||||||||
| P21 |
full or isothermal anneal normalize and temper |
… | … | 1250 [675] | |||||||||||||||||
| P22 |
full or isothermal anneal normalize and temper |
… | … | 1250 [675] | |||||||||||||||||
| P23 | normalize and temper | 1900-1975 [1040-1080] | air or accelerated cooling | 1350-1470 [730-800] | |||||||||||||||||
| P24 | normalize and temper | 1800–1870 [980–1020] | air or accelerated cooling | 1350–1420 [730–770] | |||||||||||||||||
| P36 | normalize and temperB | 1650 [900] | … | 1100 [595] | |||||||||||||||||
| P91 |
normalize and temper quench and temperD |
1900-1975 [1040-1080] | … |
1350-1470 [730-800]C 1350-1470 [730-800] |
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| P92 | normalize and temper | 1900-1975 [1040-1080] | E | 1350-1470 [730-800] | |||||||||||||||||
| P122 | normalize and temper | 1900-1975 [1040-1080] | … | 1350-1470 [730-800] | |||||||||||||||||
| P911 | normalize and temper | 1900-1975 [1040-1080] | E | 1365-1435 [740-780] | |||||||||||||||||
| AWhere ellipses ({) appear in this table there is no requirement. | |||||||||||||||||||||
| BAlternatively, Grade P36, Class 2 shall be cooled from the austenitizing temperature by accelerated cooling in air or by liquid quenching. | |||||||||||||||||||||
| CExcept when Supplementary Requirement S7 is specified by the purchaser. | |||||||||||||||||||||
| DWhen mutually agreed upon between the manufacturer and the purchaser, quenching and tempering shall be permitted for thicknesses greater than 3 in. [75 mm]. | |||||||||||||||||||||
| EAccelerated cooling from the normalizing temperature shall be permitted for section thicknesses greater than 3 in. [75 mm]. | |||||||||||||||||||||
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E91T1-B9. In addition, the sum of the Ni+Mn content of all welding consumables used to weld repair P91 shall not exceed 1.0 %. All repair welds in P92, P911, and P122, shall be made using welding consumables meeting the chemical requirements for the grade After weld repair, Grades P23, P91, P92, and P122 shall be heat treated at 1350-1470 ºF [730-800 ºC]. After weld repair, Grade P911 shall be heat treated at 1365-1435 ºF [740-780 ºC]. After weld repair, Grade P24 shall be heat treated at 1350-1420 °F [730-770 °C]. The finished pipe shall be reasonably straigh |
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| Tensile Requirements | |||||||||||||||||||||
| Grade | |||||||||||||||||||||
| P1, P2 | P12 | P23 | P91 | P92, P911 | P122 | All Others | |||||||||||||||
| Tensile strength, min | |||||||||||||||||||||
| ksi | 55 | 60 | 74 | 85 | 90 | 90 | 60 | ||||||||||||||
| Mpa | 380 | 415 | 510 | 585 | 620 | 620 | 415 | ||||||||||||||
| Yield strength, min | |||||||||||||||||||||
| ksi | 30 | 32 | 50 | 60 | 64 | 58 | 30 | ||||||||||||||
| Mpa | 205 | 220 | 400 | 415 | 440 | 400 | 205 | ||||||||||||||
| Elongation Requirements | |||||||||||||||||||||
| Elongation Requirements | |||||||||||||||||||||
| All grades except P23, P36, P91, P92, P122, and P911 | P23, P24, P91, P92, P122, and P 911 | P36 | |||||||||||||||||||
| Longitudinal | Transverse | Longitudinal | Transverse | Longitudinal | |||||||||||||||||
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Elongation in 2 in. or 50 mm, (or 4D), min, %: Basic minimum elongation for wall 5⁄16 in. [8 mm] and over in thickness, strip tests, and for all small sizes testedin full section |
30 | 20 | 20 | …… | 15 | ||||||||||||||||
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When standard round 2-in. or 50-mm gage length or proportionally smaller size specimen with the gage length equal to 4D (4 times the diameter) is used |
22 | 14 | 20 | 13 | ….. | ||||||||||||||||
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For strip tests a deduction for each 1⁄32-in. [0.8 mm] decrease in wall thickness below in. [8 mm] from the basic minimum elongation of the following percentage points shall be made |
1.50A | 1.00A | 1.00A | … | 1.00A | ||||||||||||||||
| Calculated Minimum Elongation Values | |||||||||||||||||||||
| Wall Thickness | Elongation in 2 in. or 50 mm, min, % | ||||||||||||||||||||
| All grades except P23, P36, P91, P92, P122, and P911 | P23, P24, P91, P92, P122, and P911 | P36 | |||||||||||||||||||
| in. | mm | Longitudinal | Transverse | Longitudinal | Longitudina | ||||||||||||||||
| 5⁄16(0.312) | 8 | 30 | 20 | 20 | 15 | ||||||||||||||||
| 9⁄32(0.281) | 7.2 | 28 | 19 | 19 | 14 | ||||||||||||||||
| 1⁄4 (0.250) | 6.4 | 27 | 18 | 18 | 13 | ||||||||||||||||
| 7⁄32(0.219) | 5.6 | 26 | … | 17 | 12 | ||||||||||||||||
| 3⁄16(0.188) | 4.8 | 24 | … | 16 | 11 | ||||||||||||||||
| 5⁄32(0.156) | 4 | 22 | … | 15 | 10 | ||||||||||||||||
| 1⁄8 (0.125) | 3.2 | 21 | … | 14 | 9 | ||||||||||||||||
| 3⁄32(0.094) | 2.4 | 20 | … | 13 | 8 | ||||||||||||||||
| 1⁄16(0.062) | 1.6 | 18 | … | 12 | 7 | ||||||||||||||||
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| NPS Designator | Over | Under | |||||||||||||||||||
| in. | mm | in. | mm | ||||||||||||||||||
| 1⁄8to 1 1/2, incl. | 1⁄64(0.015) | 0.40 | 1⁄64 (0.015) | 0.40 | |||||||||||||||||
| Over 1 1⁄2to 4, incl. | 1⁄32(0.031) | 0.79 | 1⁄32 (0.031) | 0.79 | |||||||||||||||||
| Over 4 to 8, incl. | 1⁄16(0.062) | 1.59 | 1⁄32 (0.031) | 0.79 | |||||||||||||||||
| Over 8 to 12, incl. | 3⁄32(0.093) | 2.38 | 1⁄32 (0.031) | 0.79 | |||||||||||||||||
| Over 12 | 1 % of the specified outside diameter | ||||||||||||||||||||
| Permitted Variations in Wall Thickness | |||||||||||||||||||||
| NPS [DN] Designator | Tolerance, % from Specified | ||||||||||||||||||||
| Over | Under | ||||||||||||||||||||
| 1⁄8to 2 1⁄2[6 to 65] incl., all t/D ratiosA | 20.0 | 12.5 | |||||||||||||||||||
| Above 2 1⁄2[65], t/D #5%A | 22.5 | 12.5 | |||||||||||||||||||
| Above 2 1⁄2[65], t/D > 5 %A | 15.0 | 12.5 | |||||||||||||||||||
| At = Specified Wall Thickness; D = Specified Outside Diameter. | |||||||||||||||||||||
| Test Method Information for Certification and Marking | |||||||||||||||||||||
| Hydrostatic | Nondestructive | Marking | |||||||||||||||||||
| YES | NO | Test Pressure | |||||||||||||||||||
| NO | YES | NDE | |||||||||||||||||||
| NO | NO | NH | |||||||||||||||||||
| YES | YES | Test Pressure/NDE | |||||||||||||||||||
| Wall Thickness: Welded and Seamless Wrought Steel Pipe, ANSI /ASME B36.10M | |||||||||||||||||||||
| SCH 5 | SCH 10 | SCH 20 | SCH 30 | SCH STD | SCH 40 | SCH 60 | SCH XS | SCH 80 | SCH 100 | ||||||||||||
| SCH 120 | SCH 160 | SCH XXS | SCH XX.H | ||||||||||||||||||
| End of pipe end | |||||||||||||||||||||
| Plain Ends (PE) | The PE pipes will generally be used for the smaller diameters pipe systems and in combination with Slip On flanges and Socket Weld fittings and flanges. | ||||||||||||||||||||
| Threaded Ends (TE) | The TE implementation speaks for itself, this performance will generally used for small diameters pipe systems, and the connections will be made with threaded flanges and threaded fittings. | ||||||||||||||||||||
| Beveled Ends (BE) | The BE implementation is applied to all diameters of buttweld flanges or buttweld fittings, and will be directly welded (with a small gap 3-4 mm) to each other or to the pipe. Ends are mostly be beveled to angle 30° (+ 5° / -0°) with a root face of 1.6 mm (± 0.8 mm). | ||||||||||||||||||||
| Grooved ends | (example Victaulic pipes): these are pipes that allow a quick connection, used for non-critical applications | ||||||||||||||||||||
| Threaded and coupled ends |
(T&C), generally used for gas distribution, Threaded connections are the most common pipe fittings used in oil and gas transportation systems. Due to external vibrations, cyclic loads, and pollution, the fitting parts may start getting loose, which could result in pipeline leaks and other environmental disasters. It is of great significance to develop a reliable technique that could provide… |
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| Type end : Plain Ends / Beveled Ends: Tubes – Pipe | |||||||||||||||||||||
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• Bevel End (BE) • Bevel Both Ends (BBE) • Bevel Large End (BLE) • Bevel One End (BOE) • Bevel Small End (BSE) • Bevel for Welding (BFW) • Buttweld End (BE) |
• End of Pipe (EOP) • Flange One End (FOE) • Plain End (PE) • Plain Both Ends (PBE) • Plain One End (POE) • Thread End (TE) • Thread Both Ends (TBE) |
• Thread Large End (TLE) • Thread One End (TOE) • Thread Small End (TSE) • Threads Only (TO) • Threads per Inch (TP I) |
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| Plastic End Caps for Tubing and Pipe Ends | |||||||||||||||||||||
| Pipe End Caps | Pipe End Plugs | Threaded Pipe Caps | Threaded Pipe Plugs | ||||||||||||||||||
| Standard: Pipe of Tube | |||||||||||||||||||||
| The American Society Of Mechanical Engineers | American National Standards Institute | ||||||||||||||||||||
| ASME B36.19M | ANSI B36.19M | ||||||||||||||||||||
| ASME B36.10M | ANSI B36.10M | ||||||||||||||||||||