SAE-AISI O7 (T31507) Oil-Hardening Steel
Tool Steels
Property Overview
Density7.9g/cm³
Elastic Modulus190GPa
Tensile Strength680 to 2110MPa
Yield StrengthUnknown
Brinell HardnessUnknown
Maximum Service TemperatureUnknown
Chemical Composition
C
1.1 to 1.3%
CR
0.35 to 0.85%
NI
0 to 0.3%
MO
0 to 0.3%
MN
0 to 1.0%
SI
0 to 0.6%
P
0 to 0.030%
S
0 to 0.030%
CU
0 to 0.25%
V
0 to 0.4%
W
1.0 to 2.0%
FE
92.9 to 97.6%
Mechanical
Elastic (Young's, Tensile) Modulus
190 GPa
Poisson's Ratio
0.29
Shear Modulus
73 GPa
Tensile Strength: Ultimate (UTS)
680 to 2110 MPa
Physical
Density
7.9 g/cm 3
Thermal
Latent Heat of Fusion
250 J/g
Melting Completion (Liquidus)
1480 °C
Melting Onset (Solidus)
1430 °C
Specific Heat Capacity
470 J/kg-K
Thermal Conductivity
41 W/m-K
Thermal Diffusivity
11 mm 2 /s
Thermal Expansion
12 µm/m-K
Thermal Shock Resistance
23 to 70 points
Electrical
Electrical Conductivity: Equal Volume
7.6 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.7 % IACS
Calculated
PREN (Pitting Resistance)
3.6
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
24 to 74 points
Strength to Weight: Bending
22 to 46 points
Environmental
Base Metal Price
6.0 % relative
Embodied Carbon
2.3 kg CO 2 /kg material
Embodied Energy
33 MJ/kg
Embodied Energy
33 MJ/kg 14 x 10 3 BTU/lb
Embodied Water
52 L/kg
Embodied Water
52 L/kg 6.2 gal/lb
Registered Designations & Aliases
SAE-AISI O7 (T31507) Oil-Hardening SteelT31507
Standards
ASTM A681 ASTM A681: Standard Specification for Tool Steels Alloy
ASTM A681 ASTM A681: Standard Specification for Tool Steels Alloy Tool Steels, 5th ed., George Roberts et al., 1998 Tool Steels: Properties and Performance, Rafael A. Mesquita (editor), 2016