LOW TEMPERATURE CARBON STEEL VALVES LCC/LCB/LF2

Global Supply Line stocks and indents a large range of carbon steel valves in low temperature carbon steel such as forged ASTM A350 LF2 and it’s cast equivalent ASTM A352 LCB. Higher grades such as ASTM A352 LCC and Alloy (Nickel) based forged carbon steel A350-LF3 and it’s cast equivalent A352-LC3 are also available on an indent basis. LF2 and LCB low temperature carbon steels are suitable for continuous service down to -46ºC, up to 345ºC. However alloy – Nickel based carbon steels like LCB, LF3, etc. are rated to lower temperatures (see below table). For cryogenic service colder than these temperatures austenitic stainless grades such as 304, 316 (CF8, CF8M) are required.

Low Temperature Steel Types

Steel Type	Grade (forging)	Grade (cast)	Composition	Min Temperature
Austenitic	A182, F316	A351 CF8M	18Cr, 8Ni, 2Mo	-196ºC
Nickel Based Steel	A350 LF3	A352 LC3	3 1/2Ni	-101ºC
Nickel Based Steel	NO EQUIV	A352 LC2	2 1/2Ni	-73ºC
Low Temp Carbon Steel	NO EQUIV	A352 LC1	0.5Mo	-59ºC
Low Temp Carbon Steel	A350 LF2	A352 LCB	Carbon Steel	-46ºC
Low Temp Carbon Steel	NO EQUIV	A352 LCC	Carbon Steel	-46ºC

Applications

Other than temperature capabilities, LF2 and LCB are suitable for the same standard service applications as outlined as outlined at this website for A105 and WCB such as steam, hydrocarbons and general industrial services. The main difference between LF2/ LCB and A105/WCB is that LF2/LCB is Charpy impact tested at -46ºC. For this reason, Global Supply Line stocks LF2 and LCB valves dual conforming to A105 and WCB. We also stock A352-LCC triple conforming to WCB, LCB and WCC.

Carbon Steel Grades – Ex Stock

Material Group	Common Name	Material Type	UNS	Forging Spec.	Casting Spec. Equivalent	DIN	DIN W. No	Application
Carbon Steel	CS	C-Si	K03504	A105	A216-WCB	C22.8 DIN 17243	1.0460	General non-corrosive service from -29ºC (-20ºF) to 425ºC (800ºF)
Carbon Steel	CS	C-Si	K03504	A105N	A216-WCC	C22.8 DIN 17243	1.0460	General non-corrosive service from -29ºC (-20ºF) to 425ºC (800ºF)(Slightly higher pressure ratings than WCB)
Low Temperature Carbon Steel	LTCS	C-Mn-Fe	K03011	A350-LF2	A352-LCB A352-LCC	TSTE 355 DIN 18103	1.0566	General non-corrosive service from -46ºC (-50ºF) to 340ºC (650ºF), LF2 -46ºC ~ 425ºC
Low Temperature Alloy Steel	Nickel Steel	3.1/2Ni	K32025	A350-LF3	A352-LC3	10Ni14	1.5637	-101ºC (-150ºF) to 340ºC (650ºF)

ASTM Carbon Steel Types Key Chemical Properties

KEY PHYSICAL PROPERTIES	CAST CARBON STEEL	FORGED
0.30/0.35 C Max	A216-WCB	A105
0.25 C Max	A216-WCC
LOW TEMPERATURE STEEL
0.25/0.30 C Max	A352-LCB	A350-LF2
0.5 Mo	A352-LC1
2.5 Ni	A352-LC2
3.5 Ni	A352-LC3
C-MN-Si (0.25 Max)	A352-LCC	A350-LF3
C-MN-Si-V (1.15~1.50 Mn)		A350-LF6

Chemical & Mechanical Composition A350-LF2†

CHEMICAL PROPERTIES		MECHANICAL PROPERTIES
C 0.30 Max	TS Min psi (Mpa)	70,000 (485)
Mn 0.60 – 1.35	YS Min psi (Mpa)	36,000 (250)
Si 0.15 – 0.30	EL (2″ Min)	22%
P 0.035 Max	RA Min	30%
S 0.040 Max	Hardness, Bhn	Max 197
Cr 0.30 Max	-50ºF Charpy	Min Impact
Ni 0.40 Max	Energy F t/Lb (J):-
Mo 0.12 Max	Set of 3 Specimen*	15 (20)
V 0.08 Max	For One Specimen	12 (16)
Cb 0.02 Max
Cu 0.04 Max
Pb 0.02 Max
Total Residuals = 0.50