O2 Tool Die Steels

O2 - Specification & Application

Oil-Hardening Tool Steel

Chemical composition(wt.%) of O2 grade:

Elements Min.(≥) Max.(≤) Similar Remarks
C 0.85 0.95
Si - 0.50
Mn 1.40 1.80
P - 0.030
S - 0.030
Cr - 0.50
Mo - 0.30
V - 0.30
W - -
Ni+Cu - 0.75

O2 - Detail

Oil-Hardening Tool Steel

Mechanical properties of grade O2

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)
195 (≥) 751 (≥) 23 23 14 Solution and Aging, Annealing, Ausaging, Q+T,etc 132

Physical properties of grade O2

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
846 (≥) 372 (≥) 12 41 41 Solution and Aging, Annealing, Ausaging, Q+T,etc 433
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
268 992 922
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