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Bulgaria BDS 40 Constructional high grade carbon steel. Designations and technical requirements and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 40 / 40
Category Grade Standard Region/Area Standard Content
Metals 40 BDS 5785 Bulgaria Constructional high grade carbon steel. Designations and technical requirements

Chemical composition(mass fraction)(wt.%) of the 40

Element Min Max Similar
Si 0.1700 0.3700 -
S - 0.0400 -
P - 0.0350 -
Ni - 0.2500 -
Mn 0.5000 0.8000 -
Cu - 0.2500 -
Cr - 0.2500 -
C 0.3700 0.4500 -

Mechanical Properties of steel grade 40

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)
817 (≥) 818 (≥) 12 21 41 Solution and Aging, Annealing, Ausaging, Q+T,etc 124

Physical Properties of steel grade 40

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 - -     0.42 -  
991 217 - 32.3 432   -  
172 - 11 43.2   141 143

Heat Treatment of steel grade 40

Heat treated : 1929°C - 1955°C

Technological Curves of steel grade 40

Cross Reference Table (Equivalent Grade) of 40

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