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21 MoMnCr 12 AT

Romania STAS 21MoMnCr12AT Steels for motor vehicles and tractors. Grades and general technical requirements for quality and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 21MoMnCr12AT / 21 MoMnCr 12 AT
Category Grade Standard Region/Area Standard Content
Metals 21 MoMnCr 12 AT STAS 8580 Romania Steels for motor vehicles and tractors. Grades and general technical requirements for quality

Chemical composition(mass fraction)(wt.%) of the 21 MoMnCr 12 AT

Element Min Max Similar

Mechanical Properties of steel grade 21 MoMnCr 12 AT

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)
564 (≥) 728 (≥) 42 13 43 Solution and Aging, Annealing, Ausaging, Q+T,etc 313

Physical Properties of steel grade 21 MoMnCr 12 AT

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
11 - -     0.24 -  
679 435 - 43.3 433   -  
164 - 23 22.2   412 314

Heat Treatment of steel grade 21 MoMnCr 12 AT

Heat treated : 1943°C - 1492°C

Technological Curves of steel grade 21 MoMnCr 12 AT

Cross Reference Table (Equivalent Grade) of 21 MoMnCr 12 AT

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