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Bulgaria BDS 8 紧固件机械性能 - 第2部分 :规定保证载荷值的螺母 and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 8 / 8
Category Grade Standard Region/Area Standard Content
Metals 8 BDS EN 20898-2 Bulgaria 紧固件机械性能 - 第2部分 :规定保证载荷值的螺母

Chemical composition(mass fraction)(wt.%) of the 8

Element Min Max Similar

Mechanical Properties of steel grade 8

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)
618 (≥) 825 (≥) 14 43 13 Solution and Aging, Annealing, Ausaging, Q+T,etc 114

Physical Properties of steel grade 8

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
24 - -     0.34 -  
387 392 - 33.3 324   -  
686 - 13 42.2   324 144

Heat Treatment of steel grade 8

Heat treated : 1683°C - 1346°C

Technological Curves of steel grade 8

Cross Reference Table (Equivalent Grade) of 8

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