What is ASTM A312?
ASTM A 312 is a specification for seamless and welded austenitic stainless steel pipes that perform well in high-temperature and corrosive environments. The common grades covered by this specification are 304/304L and 316/316L.
Chemical Requirements
| Grade | UNS # | Content % by weight | |||||||
| Carbon | Manganese | Phosphorus | Sulfur | Silicon | Chromium | Nickel | Molybdenum | ||
| TP304 | S30400 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 18 – 20 | 8 – 11 | x |
| TP304L | S30403 | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 18 – 20 | 8 – 13 | x |
| TP316 | S31600 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 16 – 18 | 10 – 14 | 2 – 3 |
| TP316L | S31603 | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 16 – 18 | 10 – 14 | 2 – 3A |
Heat Treatment
All pipe shall be furnished in the heat-treated condition
Heat treat temperature for 304/L and 316/L is 1900 deg F (1040 deg C) minimum and then quenched in water or rapidly cooled.
Tensile Requirements
| GRADE 304 |
GRADE 304L |
GRADE 316 |
GRADE 316L |
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| Tensile Strength, minimum PSI | 75,000 | 70,000 | 75,000 | 70,000 | |
| Yield Strength, minimum PSI | 30,000 | 25,000 | 30,000 | 25,000 |
