S4 Tool Die Steels

S4 - Specification & Application

Shock-Resisting Tool Steel

Chemical composition(wt.%) of S4 grade:

Elements Min.(≥) Max.(≤) Similar Remarks
C 0.50 0.65
Si 1.75 2.25
Mn 0.60 0.95
P - 0.030
S - 0.030
Cr 0.10 0.50
Mo - -
V 0.15 0.35
W - -
Ni+Cu - 0.75

S4 - Detail

Shock-Resisting Tool Steel

Mechanical properties of grade S4

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)
932 (≥) 734 (≥) 23 41 32 Solution and Aging, Annealing, Ausaging, Q+T,etc 331

Physical properties of grade S4

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
176 (≥) 179 (≥) 14 24 41 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
851 245 128
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