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Description

Korea KS STS440A martensitic steel and STS440A Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Special Alloy: STS440A
Category Type Steel Grade Standard Country Application
Steel GradesSpecial Alloy STS440A KS Korea martensitic steel
STS403
STS410
STS41oJl
STS41OF2
STS416
STS420J1
STS420J2
STS420F
STS420F2
STS431

Chemical composition(mass fraction)(wt.%) of the STS440A

C(%) Si(%) Mn(%) P(%) S(%) Cr(%) Ni(%) Mo(%)
0.60-0.75 Max 1.00 Max 1.00 Max 0.04 Max 0.03 16.0-18.O Max 0.60 Max 0.75

Mechanical Properties of steel grade STS440A

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)
526 (≥) 469 (≥) 31 11 42 Solution and Aging, Annealing, Ausaging, Q+T,etc 231

Physical Properties of steel grade STS440A

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
31 - -     0.14 -  
328 488 - 33.3 233   -  
653 - 32 44.2   424 233

Heat Treatment of steel grade STS440A

Heat treated : 1626°C - 1767°C

Technological Curves of steel grade STS440A

Cross Reference Table (Equivalent Grade) of STS440A

Grade Standard Country Application
STS440A KS Korea martensitic steel
STS440A KS Korea martensitic steel

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