ASTM A537 Boiler Steel

ASTM A537 boiler steel is one of heat-treated carbon manganese-silicon steel plates intended for fusion welded pressure vessels and structures. There are three class grades under this specification: A537CL1, A537CL2, A537CL3. The steel shall be killed and undergo normalization, quenching and tempering. Heat and product analyses shall be performed on the materials and results shall conform to the required values in chemical composition in carbon, manganese, phosphorus, sulfur, silicon, copper, nickel, chromium and molybdenum.
The maximum thickness of ASTM A537 boiler steel plates furnished under this specification is 4 in. [100 mm] for A537 Class 1 and 6 in. [150 mm] for A537 Class 2 and A537 Class 3 steel. Mechanical testing for ASTM A537 steel plates like tension test shall be done on the plates and shall conform to the required tensile strength, yield strength, and elongation.

ASTM A537 Boiler Steel Chemical Composition of A537CL1, A537CL2, A537CL3 (%, by ladle analysis)

Material	C max.	Mn	Si	P max.	S max.
A537CL3	0.24	0.13-0.55	0.92-1.72	0.035	0.035
A537CL2	0.24	0.13-0.55	0.92-1.72	0.035	0.035
A537CL1	0.24	0.13-0.55	0.92-1.72	0.035	0.035

ASTM A537 Boiler Steel Tensile Requirement of A537CL1, A537CL2, A537CL3

Material	Tensile Strength(MPa)	Yield Strength(MPa) min.	% Elongation min.
A537CL3	485-690	275-380	20
A537CL2	485-690	315-415	20
A537CL1	450-585	310	18

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