ASTM O7

Grades | Tool Die Steels | O7

ASTM O7

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O7 Application:Oil-Hardening Tool Steel

Chemical composition(mass fraction)(wt.%) of the O7
Elements Min.（≥） Max.（≤） Similar Remarks
C 1.10 1.30
Si 0.10 0.60
Mn 0.20 1.00
P - 0.030
S - 0.030
Cr 0.35 0.85
Mo - 0.30
V 0.15 0.40
W 1.00 2.00
Ni＋Cu - 0.75

Mechanical properties of grade O7

Yield
Rp0.2 (MPa)		 Tensile
Rm (MPa)		 Impact
KV (J)		 Elongation
A (%)		 Reduction in cross section on fracture
Z (%)		 As-Heat-Treated Condition HBW
735 (≥) 527 (≥) 22 11 14 Solution and Aging, Annealing, Ausaging, Q+T,etc 222

Physical properties of grade O7

Property Density
kg/dm3		 Temperature T
°C/F		 Specific heat
J / kgK		 Thermal conductivity
W/mK		 Electric resistance
µΩ·cm
625 (≥) 266 (≥) 33 44 23 Solution and Aging, Annealing, Ausaging, Q+T,etc
Temp.
°C/°F		 Creep strain limit
(10000h)
(Rp1,0) N/mm2		 Creep rupture strength
(10000h)
(Rp1,0) N/mm2		 - - -
846 532 469 - - -

O7 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