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4340

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4330 4620
#4340

Description

USA ICI 4340 Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures and 4340 Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Special Alloy: 4340
Category Type Steel Grade Standard Country Application
Steel GradesSpecial Alloy 4340 ICI USA Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures
15A
1020
1030
1040
1050
6120
4020
4130
4140
4330

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

C(％) Si(％) Mn(％) P(％) S(％) Cr(％) Ni(％) Mo(％)
0.35-0.45 0.20-0.80 0.70-1.00 0.04 0.045 0.70-0.90 1.65-2.00 0.20-0.30

Mechanical Properties of steel grade 4340

Yield
Rp0.2 (MPa)		 Tensile
Rm (MPa)		 Impact
KV/Ku (J)		 Elongation
A (%)		 Reduction in cross section on fracture
Z (%)		 As-Heat-Treated Condition Brinell hardness (HBW)
618 (≥) 785 (≥) 42 21 42 Solution and Aging, Annealing, Ausaging, Q+T,etc 133

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
23 - -     0.31 -  
622 248 - 14.3 231   -  
968 - 12 13.2   442 243

Heat Treatment of steel grade 4340

Heat treated : 1434°C - 1737°C

Technological Curves of steel grade 4340

Cross Reference Table (Equivalent Grade) of 4340

Grade Standard Country Application
ICI 4340 AISI USA
414340 CSN Czech Republic The Czech republic Structural steel
14340 CSN Czech Republic The Czech republic Structural steel
4340 AS Australia Australia Structural steel
4340 H AS Australia Australia Structural steel
4340 AS Australia Australia Structural steel
4340 ICI USA Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures
4340 ICI USA Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures
4330 4620
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Jiangyou Longhai Special Steel Co.,Ltd.
Jiangyou Longhai Special Steel Co.,Ltd.

Our main peoducts of steel are many kinds of special steel, like tool steel, mould steel, alloy steel, alloy constructural steel, heat-resistant steel, high speed tool steel,spring steel and bearing steel , stainless steel and so on, which have formed 12 series and more than 350 varieties with n...

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