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SAE-AISI M42 Steel vs. ACI-ASTM CG8M Steel

Both SAE-AISI M42 steel and ACI-ASTM CG8M steel are iron alloys. They have 73% 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 M42 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 810 to 2310
550

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Melting Completion (Liquidus), °C 1540
1450
Melting Onset (Solidus), °C 1490
1400
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 20
16
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 30
20
Density, g/cm3 8.2
7.9
Embodied Carbon, kg CO2/kg material 7.4
4.1
Embodied Energy, MJ/kg 100
56
Embodied Water, L/kg 140
160

Common Calculations

PREN (Pitting Resistance) 38
31
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 28 to 79
19
Strength to Weight: Bending, points 24 to 48
19
Thermal Diffusivity, mm2/s 5.4
4.3
Thermal Shock Resistance, points 25 to 71
12

Alloy Composition

Carbon (C), % 1.1 to 1.2
0 to 0.080
Chromium (Cr), % 3.5 to 4.3
18 to 21
Cobalt (Co), % 7.8 to 8.8
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 76.3 to 81
58.8 to 70
Manganese (Mn), % 0.15 to 0.4
0 to 1.5
Molybdenum (Mo), % 9.0 to 10
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), % 0.15 to 0.65
0 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.040
Tungsten (W), % 1.2 to 1.9
0
Vanadium (V), % 1.0 to 1.4
0