Designation: A249/A249M | ||||||||||||
Standard Specification for Welded Austenitic Steel Boiler, Superheater, Heat- Exchanger, and Condenser Tubes This standard is issued under the fixed designation A 249/A 249M; 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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Scope | ||||||||||||
This specification covers nominal-wall-thickness welded tubes and heavily cold worked welded tubes made from the austenitic steels listed in Table 1, with various grades intended for such use as boiler, superheater, heat exchanger, or condenser tubes. Grades TP304H, TP309H, TP309HCb, TP310H, TP310HCb, TP316H, TP321H, TP347H, and TP348H are modifications of Grades TP304, TP309S, TP309Cb, TP310S, TP310Cb, TP316, TP321, TP347, and TP348, and are intended for high temperature service such as for superheaters and reheaters. The tubing sizes and thicknesses usually furnished to this specification are 1⁄8 in. [3.2 mm] in inside diameter to 12 in. [304.8 mm] in outside diameter and 0.015 to 0.320 in. [0.4 to 8.1 mm], inclusive, in wall thickness. Tubing having other dimensions may be furnished, provided such tubes comply with all other requirements of this specification. Mechanical property requirements do not apply to tubing smaller than 1⁄8 in. [3.2 mm] in inside diameter or 0.015 in. [0.4 mm] in thickness. Optional supplementary requirements are provided and, when one or more of these are desired, each shall be so stated in the order. The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. The inch-pound units shall apply unless the “M” designation of this specification is specified in the order. The following safety hazards caveat pertains only to the test method described in the Supplementary Requirements of this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. A specific warning statement is given in Supplementary Requirement S7, Note S7.1. |
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Manufacture | ||||||||||||
The welded (WLD) tubes shall be made from flat-rolled steel by an automatic welding process with no addition of filler metal. Subsequent to welding and prior to final heat treatment, the tubes shall be cold worked either in both weld and base metal or in weld metal only. The method of cold working may be specified by the purchaser. When cold drawn, the purchaser may specify the minimum amount of reduction in cross-sectional area or wall thickness, or both. Heavily cold worked (HCW) tubes shall be made by applying cold working of not less than 35 % reduction in both wall and weld to a welded tube prior to the final anneal. No filler metal shall be used in the making of the weld. Prior to cold working, the weld shall be 100 % radiographically inspected in accordance with the requirements of ASME Boiler and Pressure Vessel Code, Section VIII, Division 1, latest revision, Paragraph UW 51. |
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Chemical Requirements, %A | ||||||||||||
Grade |
UNS DesignationB |
Carbon | Manganese | Phosphorous | Sulfur | Silicon | Chromium | Nickel | Molybdenum | NitrogenC | Copper | Other |
TP 201 | S20100 | 0.15 | 5.50–7.5 | 0.060 | 0.030 | 1.00 | 16.0–18.0 | 3.5–5.5 | … | 0.25 | … | … |
TP 202 | S20200 | 0.15 | 7.5–10.0 | 0.060 | 0.030 | 1.00 | 17.0–19.0 | 4.0–6.0 | … | 0.25 | … | … |
TPXM-19 | S20910 | 0.06 | 4.0–6.0 | 0.045 | 0.030 | 1.00 | 20.5–23.5 | 11.5–13.5 | 1.50–3.00 | 0.20–0.40 | … |
Cb 0.10–0.30 V 0.10–0.30 |
TPXM-29 | S24000 | 0.08 | 11.5–14.5 | 0.060 | 0.030 | 1.00 | 17.0–19.0 | 2.3–3.7 | … | 0.20–0.40 | … | … |
TP304 | S30400 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0–20.0 | 8.0–11.0 | … | … | … | … |
TP304LD | S30403 | 0.030 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0–20.0 | 8.0–12.0 | … | … | … | … |
TP304H | S30409 | 0.04–0.10 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0–20.0 | 8.0–11.0 | … | … | … | … |
… | S30415 | 0.04–0.06 | 0.80 | 0.045 | 0.030 | 1.00–2.00 | 18.0–19.0 | 9.0–10. | … | 0.12–0.18 | … | Ce 0.03–0.08 |
TP304N | S30451 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0–20.0 | 8.0–11.0 | … | 0.10–0.16 | … | … |
TP304LND | S30453 | 0.030 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0–20.0 | 8.0–11.0 | … | 0.10–0.16 | … | … |
TP305 | S30500 | 0.12 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0–19.0 | 11.0–13.0 | … | … | … | … |
… | S30615 | 0.16–0.24 | 2.00 | 0.030 | 0.030 | 3.2–4.0 | 17.0–19.5 | 13.5–16.0 | … | … | … | … |
… | S30815 | 0.05–0.10 | 0.80 | 0.040 | 0.030 | 1.40–2.00 | 20.0–22.0 | 10.0–12.0 | … | 0.14–0.20 | … | Ce 0.03–0.08 |