ASME B16.34 - Group 1.1, 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 1.1 - 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 850°F.
  • [3] Not to be used over 700°F.
  • [4] Leaded grades shall not be used where welded of in any application above 500°F.
  • [5] For service temperatures above 850°F, it is recommended that killed steels containing not less than 0.10% residual silicon be used.
  • [6] Only killed steel shall be used above 850°F.
  • [7] Not to be used over 500°F.
Material

Group No.

Material Nominal

Designation

ForgingCastingPlateBarTubular
1.1 C
C-SI
C-MN-SI

C-MN-SI-V


A105 [1] [6]
A350 Gr. LF2 [1]

A350 Gr. LF6 Cl.1 [7]

A216 Gr. WCB [1]

 


A515 Gr. 70 [1]
A516 Gr. 70 [1] [2]
A537 Gr. Cl.1 [3]
A675 Gr. 70 [1] [4] [5]
A105 [1] [6]
A350 Gr. LF2 [1]
A696 Gr. C
A672 Gr. B70 [1]
A672 Gr. C70 [1]

ASME B16.34 - Material Group 1.1 - Standard Class, Pressure-Temperature Rating

  • Ratings are maximum allowable working gage pressure (psig) at the temperature listed.
Temp. °F15030040060090015002500
-20 to 100 285 700 900 1480 2220 3705 6170
200 260 675 900 1350 2025 3375 5625
300 230 655 875 1315 1970 3280 5470
400 200 635 845 1270 1900 3170 5280
500 170 600 800 1200 1795 2995 4990
600 140 550 730 1095 1640 3735 4560
650 125 535 715 1075 1610 2685 4475
700 110 535 710 1005 1600 2665 4440
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