ASTM A312/A312M
Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
ASTM A312/A312M covers standard specification for seamless, straight-seam welded, and cold worked welded austenitic stainless steel pipe intended for high-temperature and general corrosive service.
Several grades of steel shall conform to the required chemical composition for carbon, manganese, phosphorus, sulfur, silicon, chromium, nickel, molybdenum, titanium, columbium, tantalum, nitrogen, vanadium, copper, cerium, boron, aluminum, and others.
Grades TP304H, TP309H, TP309HCb, TP310H, TP310HCb, TP316H, TP321H, TP347H, and TP348H are modifications of Grades TP304, TP309Cb, TP309S, TP310Cb, TP310S, TP316, TP321, TP347, and TP348, and are intended for service at temperatures where creep and stress rupture properties are important.
- ASTM A312 TP304
- ASTM A312 TP304L
- ASTM A312 TP316L
- ASTM A312 TP316
- ASTM A312 TP347H
- ASTM A312 TP321
- ASTM A312 TP321H
- ASTM A312 TP310S
ASTM A312 Stainless Steel Pipe Sizes
The following Table lists the standardized dimensions of welded and seamless stainless steel pipe as shown in ASME B36.19. These dimensions are also applicable to heavily cold worked pipe. Pipe having other dimensions is permitted to be ordered and furnished provided such pipe complies with all other requirements of this specification.
| Nominal Size | OD | Wall Thickness, SCHEDULE | |||||
|---|---|---|---|---|---|---|---|
| NPS | DN | mm | 5S | 10S | 40S | STD | 80S |
| 1∕8 | 6 | 10.3 | – | 1.24 | 1.73 | 1.73 | 2.41 |
| 1∕4 | 8 | 13.7 | – | 1.65 | 2.24 | 2.24 | 3.02 |
| 3∕8 | 10 | 17.2 | – | 1.65 | 2.31 | 2.31 | 3.2 |
| 1∕2 | 15 | 21.3 | 1.65 | 2.11 | 2.77 | 2.77 | 3.73 |
| 3∕4 | 20 | 26.7 | 1.65 | 2.11 | 2.87 | 2.87 | 3.91 |
| 1 | 25 | 33.4 | 1.65 | 2.77 | 3.38 | 3.38 | 4.55 |
| 1 1∕4 | 32 | 42.2 | 1.65 | 2.77 | 3.56 | 3.56 | 4.85 |
| 1 1∕2 | 40 | 48.3 | 1.65 | 2.77 | 3.68 | 3.68 | 5.08 |
| 2 | 50 | 60.3 | 1.65 | 2.77 | 3.91 | 3.91 | 5.54 |
| 2 1∕2 | 65 | 73 | 2.11 | 3.05 | 5.16 | 5.16 | 7.01 |
| 3 | 80 | 88.9 | 2.11 | 3.05 | 5.49 | 5.49 | 7.62 |
| 3 1∕2 | 90 | 101.6 | 2.11 | 3.05 | 5.74 | 5.74 | 8.08 |
| 4 | 100 | 114.3 | 2.11 | 3.05 | 6.02 | 6.02 | 8.56 |
| 5 | 125 | 141.3 | 2.77 | 3.4 | 6.55 | 6.55 | 9.53 |
| 6 | 150 | 168.3 | 2.77 | 3.4 | 7.11 | 7.11 | 10.97 |
| 8 | 200 | 219.1 | 2.77 | 3.76 | 8.18 | 8.18 | 12.7 |
| 10 | 250 | 273.1 | 3.4 | 4.19 | 9.27 | 9.27 | 12.7 |
| 12 | 300 | 323.9 | 3.96 | 4.57 | 9.53 | 9.53 | 12.7 |
| 14 | 350 | 355.6 | 3.96 | 4.78 | – | 9.53 | – |
| 16 | 400 | 406.4 | 4.19 | 4.78 | – | 9.53 | – |
| 18 | 450 | 457.2 | 4.19 | 4.78 | – | 9.53 | – |
| 20 | 500 | 508 | 4.78 | 5.54 | – | 9.53 | – |
| 22 | 550 | 558.8 | 4.78 | 5.54 | – | 9.53 | – |
| 24 | 600 | 609.6 | 5.54 | 6.35 | – | 9.53 | – |
| 26 | 650 | 660.4 | – | – | – | 9.53 | – |
| 28 | 700 | 711.2 | – | – | – | 9.53 | – |
| 30 | 750 | 762 | 6.35 | 7.92 | – | 9.53 | – |
ASTM A312 Stainless Steel Pipe Tests
All pipes shall be furnished in the heat-treated condition in accordance with the required heat treating temperature and cooling/testing requirements. Tensile properties of the material shall conform to the prescribed tensile strength and yield strength. The steel pipe shall undergo mechanical tests such as transverse or longitudinal tension test and flattening test. Grain size determination and weld decay tests shall be performed. Each pipe shall also be subjected to the nondestructive electric test or the hydrostatic test.
- Mechanical Tests
- Grain Size Determinations
- Weld Decay Tests
- Transverse or Longitudinal Tension Test
- Hydrostatic or Nondestructive Electric Test
- Flattening Test (option)
- Radiographic Examination (option)
- Intergranular Corrosion Test (option)
- Weld Decay Test (option)
Supplementary Requirement
Optional supplementary requirements are provided for pipe where a greater degree of testing is desired. These supplementary requirements call for additional tests to be made and, when desired, it is permitted to specify in the order one or more of these supplementary requirements.