4340

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Global 企业标准 4340 Latrobe Specialty Steel and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 4340 / 4340

Category	Grade	Standard	Region/Area	Standard Content
Metals	4340	--	Global	Latrobe Specialty Steel

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

Element	Min	Max	Similar
Si	-	-	0.3000
Ni	-	-	1.8000
Mo	-	-	0.2500
Mn	-	-	0.7500
Cr	-	-	0.8000
C	-	-	0.4000

Mechanical Properties of steel grade 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)
281 (≥)	178 (≥)	14	34	34	Solution and Aging, Annealing, Ausaging, Q+T,etc	233

Physical Properties of steel grade 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
41	-	-			0.44	-
437	224	-	13.3	432		-
213	-	34	11.2			344	433

Heat Treatment of steel grade 4340

Heat treated : 1785°C - 1368°C

Technological Curves of steel grade 4340

No Curve

Cross Reference Table (Equivalent Grade) of 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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