A757 Grade B3N Type 3.5Ni - ASTM A757/A757M-2022

Grade	A757 Grade B3N
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 B3N Chemical Element Composition Content (%)

Component	C	Si	Mn	P ^①	S ^①	Cr ^①	Ni	Cu ^①	Mo ^①	V ^①
Minimum Value	-	-	0.5	-	-	-	3	-	-	-
Maximum Value	0.15	0.6	0.8	0.025	0.025	0.4	4	0.5	0.25	0.03

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

A757 Grade B3N 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
/	/	NT = Normalized and tempered	≥485	≥275	≥24	≥35
Maximum Effective Section Size: 32 mm	-101℃	NT = Normalized and tempered					≥20

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