O1 Tool Die Steels

O1 - Specification & Application

Oil-Hardening Tool Steel

Chemical composition(wt.%) of O1 grade:

Elements Min.(≥) Max.(≤) Similar Remarks
C 0.85 1.00
Si 0.10 0.50
Mn 1.00 1.40
P - 0.030
S - 0.030
Cr 0.40 0.60
Mo - -
V - 0.30
W 0.40 0.60
Ni+Cu - 0.75

O1 - Detail

Oil-Hardening Tool Steel

Mechanical properties of grade O1

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)
633 (≥) 978 (≥) 11 23 14 Solution and Aging, Annealing, Ausaging, Q+T,etc 414

Physical properties of grade O1

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
264 (≥) 136 (≥) 11 32 23 Solution and Aging, Annealing, Ausaging, Q+T,etc 423
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
592 588 646
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