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Yugoslavia JUS C4340 Ball and roller bearing steels and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: C4340 / C 4340
Category Grade Standard Region/Area Standard Content
Metals C 4340 JUS C.B0.601 Yugoslavia Ball and roller bearing steels

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

Element Min Max Similar
Si - - 0.2500
Mn - - 1.1000
Cr - - 1.5000
C - - 1.0000

Mechanical Properties of steel grade C 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)
197 (≥) 438 (≥) 21 32 24 Solution and Aging, Annealing, Ausaging, Q+T,etc 444

Physical Properties of steel grade C 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 - -     0.22 -  
554 533 - 21.3 431   -  
666 - 14 44.2   144 431

Heat Treatment of steel grade C 4340

Heat treated : 1381°C - 1528°C

Technological Curves of steel grade C 4340

Cross Reference Table (Equivalent Grade) of C 4340

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