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SAE-AISI D7 Steel vs. ACI-ASTM CG8M Steel

Both SAE-AISI D7 steel and ACI-ASTM CG8M steel are iron alloys. They have 79% 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 D7 steel and the bottom bar is ACI-ASTM CG8M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 73
79
Tensile Strength: Ultimate (UTS), MPa 800 to 2120
550

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Melting Completion (Liquidus), °C 1440
1450
Melting Onset (Solidus), °C 1400
1400
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 27
16
Thermal Expansion, µm/m-K 11
16

Otherwise Unclassified Properties

Base Metal Price, % relative 10
20
Density, g/cm3 7.6
7.9
Embodied Carbon, kg CO2/kg material 11
4.1
Embodied Energy, MJ/kg 180
56
Embodied Water, L/kg 130
160

Common Calculations

PREN (Pitting Resistance) 16
31
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 29 to 78
19
Strength to Weight: Bending, points 25 to 48
19
Thermal Diffusivity, mm2/s 7.4
4.3
Thermal Shock Resistance, points 27 to 72
12

Alloy Composition

Carbon (C), % 2.2 to 2.5
0 to 0.080
Chromium (Cr), % 11.5 to 13.5
18 to 21
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 76.6 to 81.9
58.8 to 70
Manganese (Mn), % 0 to 0.6
0 to 1.5
Molybdenum (Mo), % 0.7 to 1.2
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 to 0.6
0 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.040
Vanadium (V), % 3.8 to 4.4
0