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Germany DIN 51Si7 Hot rolled steels for springs suitable for quenching and tempering - Technical delivery conditions and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 51Si7 / 51 Si 7
Category Grade Standard Region/Area Standard Content
Metals 51 Si 7 DIN 17221 Germany Hot rolled steels for springs suitable for quenching and tempering - Technical delivery conditions

Chemical composition(mass fraction)(wt.%) of the 51 Si 7

Element Min Max Similar
Si 1.5000 1.8000 -
S - 0.0450 -
P - 0.0450 -
N - 0.0070 -
Mn 0.5000 0.8000 -
C 0.4700 0.5500 -

Mechanical Properties of steel grade 51 Si 7

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)
921 (≥) 125 (≥) 13 21 31 Solution and Aging, Annealing, Ausaging, Q+T,etc 311

Physical Properties of steel grade 51 Si 7

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
44 - -     0.44 -  
352 722 - 32.3 243   -  
367 - 41 23.2   111 211

Heat Treatment of steel grade 51 Si 7

Heat treated : 1638°C - 1834°C

Technological Curves of steel grade 51 Si 7

Cross Reference Table (Equivalent Grade) of 51 Si 7

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