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4340

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4140 X7039
#4340

Description

Australia AS 4340 Australia Structural steel and 4340 Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Structure Steel: 4340
Category Type Steel Grade Standard Country Application
Steel GradesStructure Steel 4340 AS Australia Australia Structural steel
8620H
86B30H
8660H
8740H
9260H
926LH
X9315H
X4036
4130
4140

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

C(％) Si(％) Mn(％) P(％) S(％) Cr(％) Ni(％) Mo(％)
0.37-0.44 0.10-0.35 0.55-0.90 0.040 0.04 0.65-0.95 1.55-2.00 0.20-0.35

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)
766 (≥) 417 (≥) 32 11 21 Solution and Aging, Annealing, Ausaging, Q+T,etc 344

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
34 - -     0.22 -  
878 297 - 44.3 112   -  
634 - 14 22.2   134 433

Heat Treatment of steel grade 4340

Heat treated : 1714°C - 1922°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
4140 X7039
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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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