SAE 4340

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#SAE #4340

Description

SAE 4340 Carbon Steel and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Carbon Steel: SAE 4340

Category	Type	Steel Grade
Steel Grades	Carbon Steel	SAE 4340
		SAE 4317
		AISI 4320
		SAE 4320
		UNS G43200
		AISI 4337
		SAE 4337
		UNS G43370
		AISI E4337
		UNS G43376
		AISI 4340

Chemical composition(mass fraction)(wt.%) of the SAE 4340

C ≤	Si ≤	Mn ≤	P ≤	S ≤	Cr	Ni
0.38-0.43	0.15-0.35	0.6-0.8	0.035	0.04	0.7-0.9	1.65-2.0
Mo	Al	Cu	Nb	Ti	V	Ce
0.2-0.3
N	Co	Pb	B	Other

Mechanical Properties of steel grade SAE 4340

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)
134 (≥)	244 (≥)	44	11	42	Solution and Aging, Annealing, Ausaging, Q+T,etc	342

Physical Properties of steel grade SAE 4340

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
11	-	-			0.12	-
855	458	-	41.3	113		-
682	-	24	14.2			124	433

Heat Treatment of steel grade SAE 4340

Heat treated : 1245°C - 1422°C

Technological Curves of steel grade SAE 4340

No Curve

Cross Reference Table (Equivalent Grade) of SAE 4340

Grade	Standard	Country	Application
SAE NVl(1541)	SAE	USA	precipitation hardening
SAE NV2(1547)	SAE	USA	precipitation hardening
SAE NV3	SAE	USA	precipitation hardening
SAE NV4(3140)	SAE	USA	precipitation hardening
SAE NV5(8645)	SAE	USA	precipitation hardening
SAE NV6(5150)	SAE	USA	precipitation hardening
SAE NV7(4140)	SAE	USA	precipitation hardening
SAE NV8		USA	precipitation hardening
SAE NV9	SAE	USA	precipitation hardening
SAE HNVl	SAE	USA	precipitation hardening
SAE HNV2	SAE	USA	precipitation hardening
SAE HNV3	SAE	USA	precipitation hardening
SAE HNV4	SAE	USA	precipitation hardening
SAE HNV5	SAE	USA	precipitation hardening
SAE HNV6	SAE	USA	precipitation hardening
SAE HNV7(71360)	SAE	USA	precipitation hardening
SAE HNV8	SAE	USA	precipitation hardening
SAE EVl	SAE	USA	precipitation hardening
SAE EV2	SAE	USA	precipitation hardening
SAE EV3	SAE	USA	precipitation hardening

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