NV7 (4140)

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#NV7 #(4140)

Description

NV7 (4140) High Alloy and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:High Alloy: NV7 (4140)

Category	Type	Steel Grade
Steel Grades	High Alloy	NV7 (4140)
		NV2 (1547)
		H15470
		NV3
		G31410
		NV4 (3140)
		G31400
		NV5 (8645)
		H86450
		NV6 (5150)
		H51500

Chemical composition(mass fraction)(wt.%) of the NV7 (4140)

C ≤	Si ≤	Mn ≤	P ≤	S ≤	Cr	Ni
0.37-0.44	0.15-0.35	0.65-1.10	0.035	0.040	0.75-1.20
Mo	Al	Cu	Nb	Ti	V	Ce
0.15-0.25
N	Co	Pb	B	Other

Mechanical Properties of steel grade NV7 (4140)

Yield R_p0.2 (MPa)	Tensile R_m (MPa)	Impact KV/Ku (J)	Elongation A (%)	Reduction in cross section on fracture Z (%)	As-Heat-Treated Condition	Brinell hardness (HBW)
835 (≥)	438 (≥)	34	12	42	Solution and Aging, Annealing, Ausaging, Q+T,etc	321

Physical Properties of steel grade NV7 (4140)

Temperature (°C)	Modulus of elasticity (GPa)	Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and	Thermal conductivity (W/m·°C)	Specific thermal capacity (J/kg·°C)	Specific electrical resistivity (Ω mm²/m)	Density (kg/dm³)	Poisson’s coefficient, ν
14	-	-			0.13	-
415	696	-	11.3	111		-
857	-	43	23.2			124	421

Heat Treatment of steel grade NV7 (4140)

Heat treated : 1959°C - 1539°C

Technological Curves of steel grade NV7 (4140)

No Curve

Cross Reference Table (Equivalent Grade) of NV7 (4140)

Grade	Standard	Country	Application
SAE NV7(4140)	SAE	USA	precipitation hardening
SAE HNV7(71360)	SAE	USA	precipitation hardening

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