A757 Grade D1Q Class 1 Grade D1Q1 Type Cr-Mo - ASTM A757/A757M-2022

Grade	A757 Grade D1Q Class 1
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 D1Q Class 1 Chemical Element Composition Content (%)

Component	C	Si	Mn	P ^①	S ^①	Cr	Ni ^①	Cu ^①	Mo	W ^①	V ^①
Minimum Value	-	-	0.4	-	-	2	-	-	0.9	-	-
Maximum Value	0.2	0.6	0.8	0.025	0.025	2.75	0.5	0.5	1.2	0.1	0.03

① The total content of these elements shall not exceed 1.00 % including phosphorus and sulfur.

A757 Grade D1Q Class 1 Mechanical Properties

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 %
QT = quenched and tempered	585~795	≥380	≥20	≥35

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