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Description

70Mn4 Carbon Steel and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Carbon Steel: 70Mn4
Category Type Steel Grade Standard Country Application
Steel GradesCarbon Steel 70Mn4
4820H
5120H
8617H
8620H
9310H
B40
C56E
B41
56Mn4
B42

Chemical composition(mass fraction)(wt.%) of the 70Mn4

 

C
Si
Mn
P
S
Cr Ni
0.65-0.75   0.4 0.8-1.1  0.025  0.015     
Mo Al Cu Nb Ti V Ce
   0.05 0.3     +    
N O2 Pb B Other    
  0.002           
             

Mechanical Properties of steel grade 70Mn4

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)
493 (≥) 526 (≥) 32 11 34 Solution and Aging, Annealing, Ausaging, Q+T,etc 312

Physical Properties of steel grade 70Mn4

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 - -     0.42 -  
449 582 - 12.3 331   -  
184 - 12 24.2   232 434

Heat Treatment of steel grade 70Mn4

Heat treated : 1814°C - 1949°C

Technological Curves of steel grade 70Mn4


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