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

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

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