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Description

Korea KS STS440B martensitic steel and STS440B Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Special Alloy: STS440B
Category Type Steel Grade Standard Country Application
Steel GradesSpecial Alloy STS440B KS Korea martensitic steel
STS410
STS41oJl
STS41OF2
STS416
STS420J1
STS420J2
STS420F
STS420F2
STS431
STS440A

Chemical composition(mass fraction)(wt.%) of the STS440B

C(%) Si(%) Mn(%) P(%) S(%) Cr(%) Ni(%) Mo(%)
O.75-0.95 Max 1.00 Max 1.00 Max 0.04 Max 0.03 16.0-18.O Max 0.60 Max O.75

Mechanical Properties of steel grade STS440B

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)
879 (≥) 193 (≥) 11 21 22 Solution and Aging, Annealing, Ausaging, Q+T,etc 342

Physical Properties of steel grade STS440B

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 -  
298 239 - 41.3 423   -  
554 - 33 31.2   324 412

Heat Treatment of steel grade STS440B

Heat treated : 1816°C - 1736°C

Technological Curves of steel grade STS440B

Cross Reference Table (Equivalent Grade) of STS440B

Grade Standard Country Application
STS440B KS Korea martensitic steel
STS440B KS Korea martensitic steel

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