What is ASTM A249 standard?
ASTM A249 is a standard specification for welded austenitic steel tubes used as boilers, superheaters, heat exchangers, and condensers. It covers the chemical and mechanical requirements, testing, and quality control for these tubes, which are available in various grades like TP304, TP304L, and TP316L. The specification defines the size range, dimensional tolerances, heat treatment, and surface finish requirements for the tubes.
ASTM A249 TP304 specification
ASTM A249 TP304 is a specification for welded austenitic stainless steel tubing used in applications like boilers, heat exchangers, and condensers. It requires a minimum tensile strength of 515 MPa, a minimum yield strength of 205 MPa, and a minimum elongation of 40% in 50mm. The specification covers the material, dimensions, tolerances, testing, and delivery conditions for this tubing, which is produced from flat-rolled strips and often bright annealed for a clean surface.
| Grade | UNS No. | EN No. | C | Cr | Ni | Mo | Others |
| 304 | S30400 | 1.4301 | 0.08 | 18.00 – 20.00 | 8.00 – 12.00 | – | – |
| 304L | S30403 | 1.4307 | 0.035 | 18.00 – 20.00 | 8.00 – 12.00 | – | – |
| 310S | S31008 | 1.4845 | 0.08 | 24.00 – 26.00 | 19.00 – 22.00 | – | – |
| 316 | S31620 | 1.4401 | 0.08 | 16.00 – 18.00 | 10.00 – 14.00 | 2.00 – 3.00 | – |
| 316L | S31603 | 1.4404 | 0.035 | 16.00 – 18.00 | 10.00 – 14.00 | 2.00 – 3.00 | – |
| 316H | S31603 | – | 0.04 – 0.10 | 16.00 – 18.00 | 10.00 – 14.00 | 2.00 – 3.00 | – |
| 316Ti | S31635 | 1.4571 | 0.08 | 16.00 – 18.00 | 10.00 – 14.00 | 2.00 – 3.00 | Ti:5X(C+N) – 0.70 |
| 317L | S31703 | 1.4438 | 0.035 | 18.00 – 20.00 | 11.00 – 15.00 | 3.00 – 4.00 | – |
| 321 | S32100 | 1.4541 | 0.08 | 17.00 – 19.00 | 9.00 – 12.00 | – | Ti:5X(C+N) – 0.70 |
| 347 | S34700 | 1.4550 | 0.08 | 16.00 – 18.00 | 10.00 – 14.00 | – | – |
| 347H | S34709 | 1.4551 | 0.04 – 0.10 | 17.00 – 20.00 | 9.00 – 13.00 | – | – |
| Material | Heat treatment | Temperure F (C) Min. | Hardness | |
| Brinell | Rockwell | |||
| TP304 | Solution | 1900 (1040) | 192HBW/200HV | 90HRB |
| TP304L | Solution | 1900 (1040) | 192HBW/200HV | 90HRB |
| TP316 | Solution | 1900(1040) | 192HBW/200HV | 90HRB |
| TP316L | Solution | 1900(1040) | 192HBW/200HV | 90HRB |
| TP321 | Solution | 1900(1040) F | 192HBW/200HV | 90HRB |
| TP347 | Solution | 1900(1040) | 192HBW/200HV | 90HRB |
| NB SIZES | SCH 5 | SCH 10 | SCH 40 | SCH 80 | SCH 160 |
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1/2″ |
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3/4″ |
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1″ |
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1 1/4″ |
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1 1/2″ |
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2″ |
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2 1/2″ |
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3″ |
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4″ |
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5″ |
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6″ |
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| Specification | Size OD Range Inches | Tolerances | |||
|---|---|---|---|---|---|
| O.D. | Wall | ||||
| Plus | Minus | Plus | Minus | ||
| ASTM-A-249 | Under 1.000 | .004" | .004" | 10% | l0% |
| ASME-SA-249 | 1.000 to 1.500 | .006" | .006" | 10% | 10% |
| Welded & Cold Worked | 1.501 to 1.999 | .008" | .008" | l0% | 10% |
| Heat Exchanger Tube | 2.000 to 2.499 | .010" | .010" | 10% | 10% |
| Average Wall | 2.500 to 2.999 | .012" | .012" | 10% | 10% |
| (see Note 1) | 3.000 to 4.000 | .015" | .015" | 10% | 10% |
| 4.001 to 5.000 | .015" | .025" | 10% | 10% | |
| ASTM-A-213 | Under 1.000 | .004" | .004" | 20% | 0% |
| ASME-SA-213 | 1.000 to 1.500 | .006" | .005" | 20% | 0% |
| Cold Finished Seamless | 1.501 to 1.999 | .008" | .008" | 22% | 0% |
| Heat Exchanger Tube | 2.000 to 2.499 | .010" | .010" | 22% | 0% |
| Minimum Wall | 2.500 to 2.999 | .012" | .012" | 22% | 0% |
| (see Note 2 & 3) | 3.000 to 4.000 | .015" | .015" | 22% | 0% |
| 4.001 to 5.000 | .015" | .025" | 22% | 0% | |
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Notes (1) Also available in minimum wall + 18/-0%. (2) Also available in average wall ± 10% (3) Also available hot finished, see |
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