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Chemical composition % of the ladle analysis of grade S7

C(％) Si(％) Mn(％) P(％) S(％) Cr(％) Mo(％) V(%)
0.45～0.55 0.20～1.00 0.20～0.90 ≤0.030 ≤0.030 3.00～3.50 1.30～1.80 ≤0.35
S7
Mechanical properties of grade S7
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)
761 (≥) 429 (≥) 42 12 34 Solution and Aging, Annealing, Ausaging, Q+T,etc 324
Physical properties of grade S7
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
819 (≥) 917 (≥) 23 23 42 Solution and Aging, Annealing, Ausaging, Q+T,etc 324
Temp.
°C/°F		 Creep strain limit
(10000h)
(Rp1,0) N/mm2		 Creep rupture strength
(10000h)
(Rp1,0) N/mm2
896 444 484
S7 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
304S71
Specification for carbon, low alloy and stainless steel bars and billets for bolting material to be used in pressure retaining applications
S7
Shock-Resisting Tool Steel
S75CM
Cold rolled special steel strip

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