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Hardened SAE-AISI M2 vs. Hardened SAE-AISI M42

Both hardened SAE-AISI M2 and hardened SAE-AISI M42 are iron alloys. Both are furnished in the hardened (H) condition. They have a moderately high 92% of their average alloy composition in common.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.29
Rockwell C Hardness 66
71
Shear Modulus, GPa 77
78
Tensile Strength: Ultimate (UTS), MPa 2150
2310

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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