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8 CrMo 4-5

Korea KS 8CrMo4-5 Seamless steel tubes for pressure purpose-Technical delivery Conditions - Part 2:Unalloyed and alloyed steels with specified elevated temperature properties and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 8CrMo4-5 / 8 CrMo 4-5
Category Grade Standard Region/Area Standard Content
Metals 8 CrMo 4-5 KS D ISO 9329-2 Korea Seamless steel tubes for pressure purpose-Technical delivery Conditions - Part 2:Unalloyed and alloyed steels with specified elevated temperature properties

Chemical composition(mass fraction)(wt.%) of the 8 CrMo 4-5

Element Min Max Similar
C - 0.1500 -
Mn 0.3000 0.6000 -
P - 0.0350 -
S - 0.0350 -
Si - 0.5000 -
Cr 0.8000 1.2500 -
Mo 0.4500 0.6500 -
Al - 0.0200 -

Mechanical Properties of steel grade 8 CrMo 4-5

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)
149 (≥) 782 (≥) 23 21 23 Solution and Aging, Annealing, Ausaging, Q+T,etc 444

Physical Properties of steel grade 8 CrMo 4-5

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
32 - -     0.12 -  
986 734 - 14.3 332   -  
886 - 11 42.2   132 321

Heat Treatment of steel grade 8 CrMo 4-5

Heat treated : 1596°C - 1352°C

Technological Curves of steel grade 8 CrMo 4-5

Cross Reference Table (Equivalent Grade) of 8 CrMo 4-5

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