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Hardened SAE-AISI H12 vs. Hardened SAE-AISI M2

Both hardened SAE-AISI H12 and hardened SAE-AISI M2 are iron alloys. Both are furnished in the hardened (H) condition. They have 90% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is hardened SAE-AISI H12 and the bottom bar is hardened SAE-AISI M2.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.29
Rockwell C Hardness 57
66
Shear Modulus, GPa 75
77
Tensile Strength: Ultimate (UTS), MPa 1850
2150

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Melting Completion (Liquidus), °C 1480
1610
Melting Onset (Solidus), °C 1440
1570
Specific Heat Capacity, J/kg-K 470
440
Thermal Conductivity, W/m-K 36
22
Thermal Expansion, µm/m-K 12
10

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
24
Density, g/cm3 7.9
8.4
Embodied Carbon, kg CO2/kg material 2.9
8.8
Embodied Energy, MJ/kg 41
130
Embodied Water, L/kg 76
98

Common Calculations

PREN (Pitting Resistance) 12
31
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 65
71
Strength to Weight: Bending, points 42
44
Thermal Diffusivity, mm2/s 9.8
5.9
Thermal Shock Resistance, points 60
76

Alloy Composition

Carbon (C), % 0.3 to 0.4
0.78 to 1.1
Chromium (Cr), % 4.8 to 5.5
3.8 to 4.5
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 87.8 to 91.7
78.5 to 83.4
Manganese (Mn), % 0.2 to 0.5
0.15 to 0.4
Molybdenum (Mo), % 1.3 to 1.8
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), % 0.8 to 1.2
0.2 to 0.45
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.0 to 1.7
5.5 to 6.8
Vanadium (V), % 0 to 0.5
1.8 to 2.2