Hardened A8 Tool Steel
Tool Steels
Property Overview
Density7.9g/cm³
Elastic Modulus190GPa
Tensile Strength1920MPa
Yield StrengthUnknown
Brinell HardnessUnknown
Maximum Service TemperatureUnknown
Chemical Composition
C
0.5 to 0.6%
CR
4.8 to 5.5%
NI
0 to 0.3%
MO
1.2 to 1.7%
MN
0 to 0.5%
SI
0.75 to 1.1%
P
0 to 0.030%
S
0 to 0.030%
CU
0 to 0.25%
W
1.0 to 1.5%
FE
88.5 to 91.9%
Mechanical
Elastic (Young's, Tensile) Modulus
190 GPa
Poisson's Ratio
0.29
Shear Modulus
74 GPa
Tensile Strength: Ultimate (UTS)
1920 MPa
Hardness
Rockwell C Hardness
59
Physical
Density
7.9 g/cm 3
Thermal
Latent Heat of Fusion
270 J/g
Melting Completion (Liquidus)
1480 °C
Melting Onset (Solidus)
1430 °C
Specific Heat Capacity
470 J/kg-K
Thermal Conductivity
37 W/m-K
Thermal Diffusivity
9.9 mm 2 /s
Thermal Expansion
12 µm/m-K
Thermal Shock Resistance
62 points
Electrical
Electrical Conductivity: Equal Volume
8.3 % IACS
Electrical Conductivity: Equal Weight (Specific)
9.5 % IACS
Calculated
PREN (Pitting Resistance)
12
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
68 points
Strength to Weight: Bending
44 points
Environmental
Base Metal Price
8.5 % relative
Embodied Carbon
2.3 kg CO 2 /kg material
Embodied Energy
31 MJ/kg
Embodied Energy
31 MJ/kg 13 x 10 3 BTU/lb
Embodied Water
73 L/kg
Embodied Water
73 L/kg 8.8 gal/lb
Registered Designations & Aliases
Hardened A8 Tool Steel
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