AISI 4340

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America AISI AISI4340 Chemical compositions of SAE alloy steels and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: AISI4340 / AISI 4340

Category	Grade	Standard	Region/Area	Standard Content
Metals	AISI 4340	SAE J 404	America	Chemical compositions of SAE alloy steels

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

Element	Min	Max	Similar
Si	0.1500	0.3500	-
S	-	0.0400	-
P	-	0.0350	-
Ni	1.6500	2.0000	-
Mo	0.2000	0.3000	-
Mn	0.6000	0.8000	-
Cu	-	0.3500	-
Cr	0.7000	0.9000	-
C	0.3800	0.4300	-
Si	0.5000	0.9000	-
S	-	0.0250	-
P	-	0.0250	-
Ni	1.6500	2.0000	-
Mo	0.3000	0.4500	-
Mn	0.6000	1.0000	-
Cu	-	0.3500	-
Cr	0.6500	1.0000	-
C	0.3800	0.4600	-
Si	0.1500	0.3500	-
S	-	0.0250	-
P	-	0.0250	-
Ni	1.6500	2.0000	-
Mo	0.2000	0.3000	-
Mn	0.6500	0.8500	-
Cu	-	0.3500	-
Cr	0.7000	0.9000	-
C	0.3800	0.4300	-

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)
217 (≥)	446 (≥)	32	43	23	Solution and Aging, Annealing, Ausaging, Q+T,etc	334

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
21	-	-			0.24	-
578	632	-	22.3	114		-
971	-	32	11.2			132	124

Heat Treatment of steel grade AISI 4340

Heat treated : 1935°C - 1994°C

Technological Curves of steel grade AISI 4340

No Curve

Cross Reference Table (Equivalent Grade) of AISI 4340

Grade	Standard	Country	Application
ASTM 5140
AISI 201
AISI 202
1.2767
17-4PH
AISI 1052
AISI 416Se
AISI 1330
AISI 205 Stainless Steel
AISI A10
AISI A2
AISI A3
AISI A4
1.0036
1.0037
SAE J403
UNS G10100
AMS 4924
ASTM A36
Electrode 100S-1

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