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Germany DIN MK75 Cold Rolled Steel Strips for Springs; Technical Conditions of Delivery and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: MK75 / MK 75
Category Grade Standard Region/Area Standard Content
Metals MK 75 DIN 17222 Germany Cold Rolled Steel Strips for Springs; Technical Conditions of Delivery

Chemical composition(mass fraction)(wt.%) of the MK 75

Element Min Max Similar
Si 0.1500 0.2500 -
S - 0.0350 -
P - 0.0350 -
Mn 0.4000 0.6000 -
C 0.7000 0.8000 -

Mechanical Properties of steel grade MK 75

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)
825 (≥) 825 (≥) 13 14 24 Solution and Aging, Annealing, Ausaging, Q+T,etc 121

Physical Properties of steel grade MK 75

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 - -     0.41 -  
818 284 - 34.3 124   -  
585 - 31 43.2   433 331

Heat Treatment of steel grade MK 75

Heat treated : 1249°C - 1135°C

Technological Curves of steel grade MK 75

Cross Reference Table (Equivalent Grade) of MK 75

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