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STR3Application:KS standard martensite heat resistant steel
CategoryTypeSteel gradeStandardCountry
Grades Special Alloy STR3KSKorea

Chemical composition%of the ladle analysis of gradeSTR3

C(%)Si(%)Mn(%)P(%)S(%)Cr(%)Ni(%)Mo(%)
0.35-0.451.80-2.50Max 0.60Max 0.03Max 0.0310.0-12.0Max 0.600.70-1.30
KS standard martensite heat resistant steel
Mechanical properties of gradeSTR3
Proof strength
Rp0.2(MPa)
Tensile strength
Rm(MPa)
Impact energy
KV(J)
Elongation at fracture
A(%)
Reduction in cross section on fracture
Z(%)
As-Heat-Treated ConditionBrinell hardness(HBW)
952(≥)134(≥)233112Solution and Aging,Annealing,Ausaging,Q+T,etc131
Physical properties of gradeSTR3
PropertyDensity
kg/dm3
Temperature T
°C/F
Specific heat
J/kgK
Thermal conductivity
W/mK
Electric resistance
µΩ·cm
Modulus of elasticity
kN/mm2
Expansion rate
695(≥)923(≥)413133Solution and Aging,Annealing,Ausaging,Q+T,etc333
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0)N/mm2
Creep rupture strength
(10000h)
(Rp1,0)N/mm2
887336559
STR3Range of products
Product typeProductsDimensionProcessesDeliver Status
Plates/SheetsPlates/Sheets0.08-200mm(T)*W*LForging,hot rolling and cold rollingAnnealed,Solution and Aging,Q+T,ACID-WASHED,Shot Blasting
Steel BarRound Bar,Flat Bar,Square BarΦ8-1200mm*LForging,hot rolling and cold rolling,CastBlack,Rough Turning,Shot Blasting,
Coil/StripSteel Coil/Steel Strip0.03-16.0x1200mmCold-Rolled&Hot-RolledAnnealed,Solution and Aging,Q+T,ACID-WASHED,Shot Blasting
Pipes/TubesSeamless Pipes/Tubes,Welded Pipes/TubesOD:6-219mm x WT:0.5-20.0mmHot extrusion,Cold Drawn,WeldedAnnealed,Solution and Aging,Q+T,ACID-WASHED
Cross Reference Table(Equivalent Grade)
GradeStandardCountryApplication
STR31KSKorea
Heat - resisting steel bars
STR310KSKorea
Heat - resisting steel plates and sheets
STR35KSKorea
Heat - resisting steel bars
STR36KSKorea
Heat - resisting steel bars
STR37KSKorea
Heat - resisting steel bars
STR38KSKorea
Heat - resisting steel bars
STR309KSKorea
Heat - resisting steel plates and sheets
STR330KSKorea
Heat - resisting steel plates and sheets
STR3KSKorea
Heat - resisting steel bars

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