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SAE-AISI T8 Steel vs. ACI-ASTM CG8M Steel

Both SAE-AISI T8 steel and ACI-ASTM CG8M steel are iron alloys. They have 70% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI T8 steel and the bottom bar is ACI-ASTM CG8M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 78
79
Tensile Strength: Ultimate (UTS), MPa 780 to 2140
550

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Melting Completion (Liquidus), °C 1730
1450
Melting Onset (Solidus), °C 1670
1400
Specific Heat Capacity, J/kg-K 420
470
Thermal Conductivity, W/m-K 18
16
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 45
20
Density, g/cm3 9.0
7.9
Embodied Carbon, kg CO2/kg material 10
4.1
Embodied Energy, MJ/kg 160
56
Embodied Water, L/kg 120
160

Common Calculations

PREN (Pitting Resistance) 30
31
Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 24 to 66
19
Strength to Weight: Bending, points 21 to 41
19
Thermal Diffusivity, mm2/s 4.8
4.3
Thermal Shock Resistance, points 24 to 66
12

Alloy Composition

Carbon (C), % 0.75 to 0.85
0 to 0.080
Chromium (Cr), % 3.8 to 4.5
18 to 21
Cobalt (Co), % 4.3 to 5.8
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 69.3 to 75.4
58.8 to 70
Manganese (Mn), % 0.2 to 0.4
0 to 1.5
Molybdenum (Mo), % 0.4 to 1.0
3.0 to 4.0
Nickel (Ni), % 0 to 0.3
9.0 to 13
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.4
0 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.040
Tungsten (W), % 13.3 to 14.8
0
Vanadium (V), % 1.8 to 2.4
0