A757 Grade A2Q Type C-Mn - ASTM A757/A757M-2022

Grade	A757 Grade A2Q
Other Names
Corresponding Standard	ASTM A757/A757M-2022 Standard Specification for Steel Castings, Ferritic and Martensitic, for Pressure-Containing and Other Applications, for Low-Temperature Service
Classification	Cast Steel

A757 Grade A2Q Chemical Element Composition Content (%)

Component	C ^②	Si	Mn ^②	P ^①	S ^①	Cr ^①	Ni ^①	Cu ^①	Mo ^①	V ^①
Minimum Value	-	-	-	-	-	-	-	-	-	-
Maximum Value	0.25	0.6	1.2	0.025	0.025	0.4	0.5	0.5	0.25	0.03

① The total content of these elements shall not exceed 1.00 % including phosphorus and sulfur.
② For each 0.01 % of reduction in carbon below the maximum specified, an increase of 0.04 % manganese over the maximum specified will be permitted up to 1.40 %.

A757 Grade A2Q Mechanical Properties

condition	Test Temperature	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Specified Plastic Yield Strength Rp_0.2 Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Impact Energy Absorption KV2 J
/	/	QT=Quenched and tempered	≥485	≥275	≥22	≥35
Maximum Effective Section Size: 75 mm	-46℃	QT=Quenched and tempered					≥20

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