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Chemical composition % of the ladle analysis of grade 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
KS standard martensite heat resistant steel
Mechanical properties of grade STR4
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 Condition Brinell hardness (HBW)
587 (≥) 213 (≥) 44 22 42 Solution and Aging, Annealing, Ausaging, Q+T,etc 223
Physical properties of grade STR4
Property Density
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
997 (≥) 874 (≥) 44 24 44 Solution and Aging, Annealing, Ausaging, Q+T,etc 222
Temp.
°C/°F		 Creep strain limit
(10000h)
(Rp1,0) N/mm2		 Creep rupture strength
(10000h)
(Rp1,0) N/mm2
891 666 622
STR4 Range of products
Product type Products Dimension Processes Deliver Status
Plates / Sheets Plates / Sheets 0.08-200mm(T)*W*L Forging, hot rolling and cold rolling Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Steel Bar Round Bar, Flat Bar, Square Bar Φ8-1200mm*L Forging, hot rolling and cold rolling, Cast Black, Rough Turning, Shot Blasting,
Coil / Strip Steel Coil /Steel Strip 0.03-16.0x1200mm Cold-Rolled & Hot-Rolled Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Pipes / Tubes Seamless Pipes/Tubes, Welded Pipes/Tubes OD:6-219mm x WT:0.5-20.0mm Hot extrusion, Cold Drawn, Welded Annealed, Solution and Aging, Q+T, ACID-WASHED
Cross Reference Table(Equivalent Grade)
Grade Standard Country Application
STR446
Heat - resisting steel plates and sheets
STR4
Heat - resisting steel bars
STR409
Heat - resisting steel plates and sheets
STR409L
Heat - resisting steel plates and sheets

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