ASME B16.34 - Group 1.5, Pres-Temp Rating

Written by Jerry Ratzlaff. Posted in American Society of Mechanical Engineers

American Society of Mechanical Engineers (ASME)

standards

  • ASME B16.34 - Valves Flanged, Threaded and Welding End

ASME B16.34 - Materials in Group 1.5 - Alloy Steel

  • [1] Upon prolonged exposure to temperatures above 875°F, the carbide phase of carbon-molybdenum steel may be converted to graphite. Permissible, but not recommended for prolonged use above 875°F.
  • [2] Use normalized and tempered material only.
  • [3] Not to be used over 650°F.
Material

Group No.

Material Nominal

Designation

ForgingCastingPlateBarTubular
1.5 C-1/2MO A182 Gr. F1 [1] A217 Gr. WC1 [1] [2]
A352 Gr. LC1 [3]
A204 Gr. A [1]
A204 Gr. B
A182 Gr. F1 [1] A691 Gr. CM-70 [1]

ASME B16.34 - Material Group 1.5 - Standard Class, Pressure-Temperature Rating

  • Ratings are maximum allowable working gage pressure (psig) at the temperature listed.
Temp. °F15030040060090015002500
-20 to 100 265 695 925 1390 2085 3470 5785
200 260 680 905 1360 2035 3395 5660
300 230 655 870 1305 1955 3260 5435
400 200 640 855 1280 1920 3200 5330
500 170 620 830 1245 1865 3105 5180
600 140 605 805 1210 1815 3025 5040
650 125 590 785 1175 1765 2940 4905
700 110 570 755 1135 1705 2840 4730
750 95 530 710 1065 1595 2660 4430
800 80 510 675 1015 1525 2540 4230
850 65 485 650 975 1460 2435 4060
900 50 450 600 900 1350 2245 3745
950 35 280 375 560 845 1405 2345
1000 20 165 220 330 495 825 1370