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SAE-AISI M42 Steel vs. ASTM A356 Grade 8

Both SAE-AISI M42 steel and ASTM A356 grade 8 are iron alloys. They have 82% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M42 steel and the bottom bar is ASTM A356 grade 8.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 78
73
Tensile Strength: Ultimate (UTS), MPa 810 to 2310
630

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Melting Completion (Liquidus), °C 1540
1470
Melting Onset (Solidus), °C 1490
1430
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 20
38
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 30
3.5
Density, g/cm3 8.2
7.8
Embodied Carbon, kg CO2/kg material 7.4
2.0
Embodied Energy, MJ/kg 100
26
Embodied Water, L/kg 140
55

Common Calculations

PREN (Pitting Resistance) 38
4.7
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 28 to 79
22
Strength to Weight: Bending, points 24 to 48
21
Thermal Diffusivity, mm2/s 5.4
10
Thermal Shock Resistance, points 25 to 71
18

Alloy Composition

Carbon (C), % 1.1 to 1.2
0 to 0.2
Chromium (Cr), % 3.5 to 4.3
1.0 to 1.5
Cobalt (Co), % 7.8 to 8.8
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 76.3 to 81
95.4 to 97.4
Manganese (Mn), % 0.15 to 0.4
0.5 to 0.9
Molybdenum (Mo), % 9.0 to 10
0.9 to 1.2
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0.15 to 0.65
0.2 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.2 to 1.9
0
Vanadium (V), % 1.0 to 1.4
0.050 to 0.15