S7 Tool Die Steels

S7 - Specification & Application

Shock-Resisting Tool Steel

Chemical composition(wt.%) of S7 grade:

Elements Min.(≥) Max.(≤) Similar Remarks
C 0.45 0.55
Si 0.20 1.00
Mn 0.20 0.90
P - 0.030
S - 0.030
Cr 3.00 3.50
Mo 1.30 1.80
V - 0.35
W - -
Ni+Cu - 0.75

S7 - Detail

Shock-Resisting Tool Steel

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)
742 (≥) 771 (≥) 23 34 24 Solution and Aging, Annealing, Ausaging, Q+T,etc 411

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
412 (≥) 952 (≥) 32 44 23 Solution and Aging, Annealing, Ausaging, Q+T,etc 242
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
421 673 758

Equivalent Products

We can customize the production of S7 grade, contact us for the best solution.
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