ASME B16.34 - Group 1.6, Pres-Temp Rating

Written by Jerry Ratzlaff on . 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 1.6 - 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] Permissible, but not recommended for prolonged use above 1100°F.
  • [3] Not to be used over 1000°F.
Material

Group No.

Material Nominal

Designation

ForgingCastingPlateBarTubular
1.6 C-1/2MO

1/2CR-1/2MO

1CR-1/2MO

- -

A387 Gr. 2 Cl.1 [3]
A387 Gr. 2 Cl.2 [3]
A387 Gr. 12 Cl.1 [2]

- A335 Gr. P1 [1] [3]
A369 Gr. FP1 [1] [3]
A691 Gr. 1/2CR [3]

ASME B16.34 - Material Group 1.6 - Standard Class, Pressure-Temperature Rating

  • Ratings are maximum allowable working gage pressure (psig) at the temperature listed.
  • [1] Use with buttweld valves only. Flanged end rating stop at 1000°F.
Temp. °F15030040060090015002500
-20 to 100 225 590 790 1185 1775 2955 4930
200 225 590 790 1185 1775 2955 4930
300 225 590 790 1185 1775 2955 4930
400 200 570 765 1145 1775 2860 4765
500 170 550 735 1105 1655 2755 4595
600 140 535 710 1065 1600 2665 4440
650 125 525 695 1045 1570 2615 4355
700 110 510 685 1025 1535 2560 4270
750 95 475 630 945 1420 2365 3945
800 80 475 630 945 1420 2365 3945
850 65 460 615 920 1380 2295 3830
900 50 440 590 885 1325 2210 3685
950 35 315 420 630 945 1575 2630
1000 20 200 270 405 605 1010 1685
1050 20 [1] 155 205 310 465 770 1285
1100 20 [1] 95 130 190 290 480 800
1150 20 [1] 60 80 125 185 310 515
1200 15 [1] 40 50 75 115 190 315