AISI 4340

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#AISI #4340

Description

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

Datasheet for: Steel Grades:Carbon Steel: AISI 4340

Category	Type	Steel Grade
Steel Grades	Carbon Steel	AISI 4340
		SAE 43BV14
		SAE 4317
		AISI 4320
		SAE 4320
		UNS G43200
		AISI 4337
		SAE 4337
		UNS G43370
		AISI E4337
		UNS G43376

Chemical composition(mass fraction)(wt.%) of the AISI 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 AISI 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)
524 (≥)	283 (≥)	23	21	33	Solution and Aging, Annealing, Ausaging, Q+T,etc	424

Physical Properties of steel grade AISI 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
32	-	-			0.43	-
235	344	-	31.3	433		-
353	-	22	42.2			334	333

Heat Treatment of steel grade AISI 4340

Heat treated : 1836°C - 1915°C

Technological Curves of steel grade AISI 4340

No Curve

Cross Reference Table (Equivalent Grade) of AISI 4340

Grade	Standard	Country	Application
AISI 431	AISI	USA	Martensitic special steel
AISI 440A	AISI	China	Martensitic special steel
AISI 440B	AISI	USA	Martensitic special steel
AISI 440F	AISI	USA	Martensitic special steel
AISI 440F Se	AISI	USA	Martensitic special steel
AISI 501	AISI	USA	Martensitic special steel
AISI 501A	AISI	USA	Martensitic special steel
AISI 501B	AISI	USA	Martensitic special steel
AISI 502	AISI	USA	Martensitic special steel
AISI 503	AISI	USA	Martensitic special steel
AISI 504	AISI	USA	Martensitic special steel
AISI S13800		USA	precipitation hardening
AISI S15500	AISI	USA	precipitation hardening
AISI 632	AISI	USA	precipitation hardening
AISI 630	AISI	USA	precipitation hardening
AISI 635	AISI	USA	precipitation hardening
AISI 631	AISI	USA	precipitation hardening
AISI 633	AISI	USA	precipitation hardening
AISI 633	AISI	USA	precipitation hardening
AISI 634	AISI	USA	precipitation hardening

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