Group 2.2 Pressure-Temperature Ratings
Low-carbon (L-grade) austenitic stainless steels. The lower carbon buys weld-decay resistance at the cost of a slightly lower allowable stress than the standard grades.
- Standard
- ASME B16.5
- Group
- Group 2.2
- Materials
- A182 F304L, A182 F316L, A182 F317L, A312 TP304L, A312 TP316L
- Class 150 at 100 °F
- 275 psig (19.0 bar)
- Class 150 at 600 °F
- 140 psig (9.7 bar)
| Class | 100 °F | 200 °F | 300 °F | 400 °F | 500 °F | 600 °F | 650 °F | 700 °F | 750 °F | 800 °F | 850 °F | 900 °F | 950 °F | 1000 °F |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Class 150 | 275 | 235 | 205 | 190 | 170 | 140 | 125 | 110 | 95 | 80 | 65 | 50 | 35 | 20 |
| Class 300 | 720 | 620 | 560 | 515 | 480 | 450 | 445 | 430 | 425 | 415 | 405 | 395 | 385 | 365 |
| Class 400 | 960 | 825 | 745 | 685 | 635 | 600 | 590 | 575 | 565 | 550 | 540 | 525 | 515 | 485 |
| Class 600 | 1440 | 1240 | 1120 | 1025 | 955 | 900 | 890 | 865 | 845 | 830 | 810 | 790 | 775 | 725 |
| Class 900 | 2160 | 1860 | 1680 | 1540 | 1435 | 1355 | 1330 | 1300 | 1265 | 1245 | 1215 | 1190 | 1160 | 1090 |
| Class 1500 | 3600 | 3095 | 2795 | 2570 | 2390 | 2255 | 2220 | 2170 | 2110 | 2075 | 2030 | 1980 | 1930 | 1815 |
| Class 2500 | 6000 | 5160 | 4660 | 4280 | 3980 | 3760 | 3700 | 3610 | 3520 | 3460 | 3380 | 3300 | 3220 | 3025 |
Interpolation between listed temperatures is permitted; extrapolation is not.
Common questions
Which materials are in ASME B16.5 Group 2.2?
A182 F304L, A182 F316L, A182 F317L, A312 TP304L, A312 TP316L.
What is a Class 300 Group 2.2 flange rated at 600 °F?
450 psig (31.0 bar). At 100 °F the same flange is rated 720 psig (49.6 bar).