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China HB 4J28 膨胀合金热处理工艺说明书 and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 4J28 / 4J28
Category Grade Standard Region/Area Standard Content
Metals 4J28 HB/Z 239 China 膨胀合金热处理工艺说明书

Chemical composition(mass fraction)(wt.%) of the 4J28

Element Min Max Similar

Mechanical Properties of steel grade 4J28

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)
221 (≥) 475 (≥) 21 22 14 Solution and Aging, Annealing, Ausaging, Q+T,etc 422

Physical Properties of steel grade 4J28

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
33 - -     0.21 -  
968 655 - 32.3 432   -  
561 - 43 12.2   114 112

Heat Treatment of steel grade 4J28

Heat treated : 1418°C - 1979°C

Technological Curves of steel grade 4J28

Cross Reference Table (Equivalent Grade) of 4J28

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