40CrNi2Mo 40CNM - GB /T 41157.1-2022

Grade	40CrNi2Mo
China ISC	40CNM
Corresponding Standard	GB /T 41157.1-2022 Fasteners for nuclear power plants— Part1: Bolts, screws and studs made of alloy steel
Classification	Alloy Steel

40CrNi2Mo Chemical Element Composition Content (%)

	Component	C	Si	Mn	P	S	Cr	Ni	Mo
熔炼分析	Minimum Value	0.37	0.15	0.6	-	-	0.65	1.55	0.2
熔炼分析	Maximum Value	0.44	0.35	0.95	0.025	0.015	0.95	2	0.3

	Component	C	Si	Mn	P	S	Cr	Ni	Mo
成品分析	Minimum Value	0.35	0.13	0.56	-	-	0.6	1.5	0.18
成品分析	Maximum Value	0.46	0.37	0.99	0.025	0.015	1	2.05	0.32

40CrNi2Mo Mechanical Properties

product	Test Temperature	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW	Impact Energy Absorption KV2 J
Bolts, Screws, Studs	Room Temperature	Grade A: ≥1070 Grade B: ≥1000 Grade C: ≥930	Grade A: 965~1034 Grade B: 895~1034 Grade C: 825~1034	Grade A: ≥11 Grade B: ≥12 Grade C: ≥13	Grade A: ≥40 Grade B: ≥40 Grade C: ≥45	HBW Grade A: 311~388 Grade B: 293~363 Grade C: 269~341 HRC Grade A: 32~41 Grade B: 30~38 Grade C: 27~36 HV Grade A: 315~393 Grade B: 297~368 Grade C: 273~346	-12°C: Grade A: ≥34 (Individual), ≥41 (Average) Grade B: ≥34 (Individual), ≥41 (Average) Grade C: ≥41 (Individual), ≥47 (Average)
Bolts, Screws, Studs			Grade A: ≥842 Grade B: ≥782 Grade C: ≥722

Approximate Comparison Table Structural Alloy Steel

40CrNi2Mo Corresponding Standards(Same grade name, different standards)

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