ASME B16.34 - Group 1.2, Pres-Temp Rating

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

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