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Bulgaria BDS 40ChML Low alloyed steel castings. Designations and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 40ChML / 40 ChML
Category Grade Standard Region/Area Standard Content
Metals 40 ChML BDS 6550 Bulgaria Low alloyed steel castings. Designations

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

Element Min Max Similar
Si 0.2000 0.5000 -
S - 0.0400 -
P - 0.0400 -
Mo 0.2000 0.3000 -
Mn 0.5000 0.8000 -
Cu - 0.3000 -
Cr 0.8000 1.2000 -
C 0.3800 0.4500 -

Mechanical Properties of steel grade 40 ChML

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)
729 (≥) 489 (≥) 41 11 14 Solution and Aging, Annealing, Ausaging, Q+T,etc 244

Physical Properties of steel grade 40 ChML

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
21 - -     0.44 -  
489 476 - 41.3 321   -  
457 - 23 32.2   434 414

Heat Treatment of steel grade 40 ChML

Heat treated : 1411°C - 1912°C

Technological Curves of steel grade 40 ChML

Cross Reference Table (Equivalent Grade) of 40 ChML

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