ASME B16.34 - Group 1.2, 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 1.2 - Carbon Steel

  • [1] Upon prolonged exposure to temperatures above 800°F, the carbide phase of the steel may be converted to graphite. Permissible, but not recommended for prolonged use above 800°F.
  • [2] Not to be used over 650°F.
  • [3] Not to be used over 800°F.
  • [4] Not to be used over 500°F.
Material

Group No.

Material Nominal

Designation

ForgingCastingPlateBarTubular
1.2 C-SI
2 1/2 NI
3 1/2 NI
C-MN-SI

C-MN-SI-V

A350 Gr. LF3 [2]


A350 Gr. LF6 Cl.2 [4]


A352 Gr. LC2 [2]
A352 Gr. LC3 [2]
A216 Gr. WCC [1]
A352 Gr. LCC [2]

A203 Gr. B [1]
A203 Gr. E [1]

A350 Gr. LF3 [2]

A106 Gr. C [3]

 

ASME B16.34 - Material Group 1.2 - Standard Class, Pressure-Temperature Rating

  • Ratings are maximum allowable working gage pressure (psig) at the temperature listed.
Temp. °F15030040060090015002500
-20 to 100 290 750 1000 1500 2250 3750 6250
200 260 750 1000 1500 2250 3750 6250
300 230 730 970 1455 2185 3640 6070
400 200 705 940 1410 2115 3530 5880
500 170 665 885 1330 1995 3325 5540
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 95 505 670 1010 1510 2520 4200
800 80 410 550 825 1235 2060 3430
850 65 270 355 535 805 1340 2230
900 50 170 230 345 515 860 1430
950 35 105 140 205 310 515 860
1000 20 50 70 105 155 260 430