A757 Grade E2Q Class 2 Grade E2Q2 Type Ni-Cr-Mo - ASTM A757/A757M-2022

Grade	A757 Grade E2Q Class 2
Other Names
Old Grade
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 E2Q Class 2 Chemical Element Composition Content (%)

Component	C	Si	Mn	P ^①	S ^①	Cr	Ni	Cu ^①	Mo	W ^①	V ^①
Minimum Value	-	-	0.4	-	-	1.5	2.75	-	0.4	-	-
Maximum Value	0.2	0.6	0.7	0.02	0.02	2	3.9	0.5	0.6	0.1	0.03

① The total content of these elements shall not exceed 0.70 % including phosphorus and sulfur.

A757 Grade E2Q Class 2 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	725~930	≥585	≥15	≥30
Maximum Effective Section Size: 32 mm	-73℃	QT = Quenched and tempered					≥27

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