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STR4

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STR3 STRll
#STR4

Description

Korea KS STR4 KS standard martensite heat resistant steel and STR4 Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Special Alloy: STR4
Category Type Steel Grade Standard Country Application
Steel GradesSpecial Alloy STR4 KS Korea KS standard martensite heat resistant steel
STR37
STR38
STR309
STR310
STR330
STR660
STR661
STR446
STRl
STR3

Chemical composition(mass fraction)(wt.%) of the STR4

C(％) Si(％) Mn(％) P(％) S(％) Cr(％) Ni(％)
0.75-0.85 1.75-2.25 0.20-0.60 Max 0.03 Max 0.03 19.0-20.5 1.15-1.65

Mechanical Properties of steel grade STR4

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)
125 (≥) 454 (≥) 22 42 13 Solution and Aging, Annealing, Ausaging, Q+T,etc 221

Physical Properties of steel grade STR4

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 - -     0.34 -  
876 799 - 42.3 324   -  
245 - 23 44.2   321 124

Heat Treatment of steel grade STR4

Heat treated : 1734°C - 1186°C

Technological Curves of steel grade STR4

Cross Reference Table (Equivalent Grade) of STR4

Grade Standard Country Application
STR446 KS Korea KS standard ferrite heat resistant steel
STR4 KS Korea KS standard martensite heat resistant steel
STR3 STRll
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Jiangyou Longhai Special Steel Co.,Ltd.
Jiangyou Longhai Special Steel Co.,Ltd.

Our main peoducts of steel are many kinds of special steel, like tool steel, mould steel, alloy steel, alloy constructural steel, heat-resistant steel, high speed tool steel,spring steel and bearing steel , stainless steel and so on, which have formed 12 series and more than 350 varieties with n...

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