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China JB 50 机床零件热处理技术条件 第1部分:退火、正火、调质 and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 50 / 50
Category Grade Standard Region/Area Standard Content
Metals 50 JB/T 8491.1 China 机床零件热处理技术条件 第1部分:退火、正火、调质

Chemical composition(mass fraction)(wt.%) of the 50

Element Min Max Similar

Mechanical Properties of steel grade 50

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)
135 (≥) 689 (≥) 13 44 42 Solution and Aging, Annealing, Ausaging, Q+T,etc 413

Physical Properties of steel grade 50

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 - -     0.43 -  
947 896 - 22.3 424   -  
869 - 34 14.2   221 333

Heat Treatment of steel grade 50

Heat treated : 1794°C - 1643°C

Technological Curves of steel grade 50

Cross Reference Table (Equivalent Grade) of 50

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