40CrNi2Mo - NB /T 20006.14-2024

Grade	40CrNi2Mo
Corresponding Standard	NB /T 20006.14-2024 Alloy Steel for Pressurized Water Reactor Nuclear Power Plants - Part 14: Forged Chromium-Nickel-Molybdenum Steel Bars for Fasteners of the Reactor Pressure Vessel and Reactor Coolant Pump
Classification	Alloy Steel

40CrNi2Mo Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo
Minimum Value	0.37	0.15	0.6	-	-	0.65	1.55	-	0.2
Maximum Value	0.44	0.35	0.95	0.02	0.01	0.95	2	0.2	0.4

40CrNi2Mo Mechanical Properties

Grade	Test Temperature	Tensile Strength σ_b Mpa	Specified Plastic Yield Strength Rp_0.2 Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW	Impact Energy Absorption KV2 J
Grade A	room temperature	≥930	≥830	≥13	≥45	277~352
Grade B	room temperature	① 1000~1170	① ≥900	≥12	≥40	302~375
Grade C	room temperature	≥1070	≥965	≥11	≥40	311~401
Grade A		≥900	≥695
Grade B		≥887	≥720
Grade C			≥774
Grade A							individual value: ≥64
Grade B							individual value: ≥34 Average value: ≥41
Grade B							individual value: ≥36 Average value: ≥48
Grade B							individual value: ≥61
Grade B							individual value: ≥64
Grade C							individual value: ≥60

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

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