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Germany DIN D78-2 Wire rod for cold drawing; technical delivery conditions for basic steel and unalloyed quality steels and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: D78-2 / D 78-2
Category Grade Standard Region/Area Standard Content
Metals D 78-2 DIN 17140-1 Germany Wire rod for cold drawing; technical delivery conditions for basic steel and unalloyed quality steels

Chemical composition(mass fraction)(wt.%) of the D 78-2

Element Min Max Similar
Si 0.1000 0.3000 -
S - 0.0400 -
P - 0.0400 -
Mn 0.3000 0.7000 -
Cu - 0.2000 -
C 0.7500 0.8000 -

Mechanical Properties of steel grade D 78-2

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)
365 (≥) 673 (≥) 12 32 31 Solution and Aging, Annealing, Ausaging, Q+T,etc 422

Physical Properties of steel grade D 78-2

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 - -     0.21 -  
899 158 - 31.3 324   -  
188 - 33 42.2   234 214

Heat Treatment of steel grade D 78-2

Heat treated : 1439°C - 1884°C

Technological Curves of steel grade D 78-2

Cross Reference Table (Equivalent Grade) of D 78-2

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