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SAE-AISI M42 Steel vs. SAE-AISI M2 Steel

Both SAE-AISI M42 steel and SAE-AISI M2 steel are iron alloys. They have a moderately high 92% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI M42 steel and the bottom bar is SAE-AISI M2 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 78
77
Tensile Strength: Ultimate (UTS), MPa 810 to 2310
760 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Melting Completion (Liquidus), °C 1540
1610
Melting Onset (Solidus), °C 1490
1570
Specific Heat Capacity, J/kg-K 450
440
Thermal Conductivity, W/m-K 20
22
Thermal Expansion, µm/m-K 12
10

Otherwise Unclassified Properties

Base Metal Price, % relative 30
24
Density, g/cm3 8.2
8.4
Embodied Carbon, kg CO2/kg material 7.4
8.8
Embodied Energy, MJ/kg 100
130
Embodied Water, L/kg 140
98

Common Calculations

PREN (Pitting Resistance) 38
31
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 28 to 79
25 to 71
Strength to Weight: Bending, points 24 to 48
22 to 44
Thermal Diffusivity, mm2/s 5.4
5.9
Thermal Shock Resistance, points 25 to 71
27 to 76

Alloy Composition

Carbon (C), % 1.1 to 1.2
0.78 to 1.1
Chromium (Cr), % 3.5 to 4.3
3.8 to 4.5
Cobalt (Co), % 7.8 to 8.8
0
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 76.3 to 81
78.5 to 83.4
Manganese (Mn), % 0.15 to 0.4
0.15 to 0.4
Molybdenum (Mo), % 9.0 to 10
4.5 to 5.5
Nickel (Ni), % 0 to 0.3
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.15 to 0.65
0.2 to 0.45
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.2 to 1.9
5.5 to 6.8
Vanadium (V), % 1.0 to 1.4
1.8 to 2.2

Comparable Variants