Hardened O2 Tool Steel
Tool Steels
Property Overview
Density7.8g/cm³
Elastic Modulus190GPa
Tensile Strength2050MPa
Yield StrengthUnknown
Brinell HardnessUnknown
Maximum Service TemperatureUnknown
Chemical Composition
C
0.85 to 1.0%
CR
0 to 0.5%
NI
0 to 0.3%
MO
0 to 0.3%
MN
1.4 to 1.8%
SI
0 to 0.5%
P
0 to 0.030%
S
0 to 0.030%
CU
0 to 0.25%
V
0 to 0.3%
FE
95 to 97.8%
Mechanical
Elastic (Young's, Tensile) Modulus
190 GPa
Poisson's Ratio
0.29
Shear Modulus
72 GPa
Tensile Strength: Ultimate (UTS)
2050 MPa
Hardness
Rockwell C Hardness
63
Physical
Density
7.8 g/cm 3
Thermal
Latent Heat of Fusion
250 J/g
Melting Completion (Liquidus)
1450 °C
Melting Onset (Solidus)
1410 °C
Specific Heat Capacity
470 J/kg-K
Thermal Conductivity
43 W/m-K
Thermal Diffusivity
12 mm 2 /s
Thermal Expansion
11 µm/m-K
Thermal Shock Resistance
70 points
Electrical
Electrical Conductivity: Equal Volume
7.4 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.6 % IACS
Calculated
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
73 points
Strength to Weight: Bending
46 points
Environmental
Base Metal Price
2.4 % relative
Embodied Carbon
1.8 kg CO 2 /kg material
Embodied Energy
26 MJ/kg
Embodied Energy
26 MJ/kg 11 x 10 3 BTU/lb
Embodied Water
50 L/kg
Embodied Water
50 L/kg 6.0 gal/lb
Registered Designations & Aliases
Hardened O2 Tool Steel
Standards
ASTM A681 ASTM A681: Standard Specification for Tool Steels Alloy
SAE J437 SAE J437: Selection and Heat Treatment of Tool and Die Steels
SAE J437 SAE J437: Selection and Heat Treatment of Tool and Die Steels 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