ASME B16.34 - Group 1.1, Pres-Temp Rating

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	Forging	Casting	Plate	Bar	Tubular
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. °F	150	300	400	600	900	1500	2500
-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

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