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Hardened SAE-AISI H24 vs. Hardened SAE-AISI M2

Both hardened SAE-AISI H24 and hardened SAE-AISI M2 are iron alloys. Both are furnished in the hardened (H) condition. They have a moderately high 91% of their average alloy composition in common.

For each property being compared, the top bar is hardened SAE-AISI H24 and the bottom bar is hardened SAE-AISI M2.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.29
Rockwell C Hardness 62
66
Shear Modulus, GPa 78
77
Tensile Strength: Ultimate (UTS), MPa 1990
2150

Thermal Properties

Latent Heat of Fusion, J/g 240
260
Melting Completion (Liquidus), °C 1750
1610
Melting Onset (Solidus), °C 1700
1570
Specific Heat Capacity, J/kg-K 420
440
Thermal Conductivity, W/m-K 27
22
Thermal Expansion, µm/m-K 12
10

Otherwise Unclassified Properties

Base Metal Price, % relative 37
24
Density, g/cm3 9.1
8.4
Embodied Carbon, kg CO2/kg material 6.1
8.8
Embodied Energy, MJ/kg 93
130
Embodied Water, L/kg 78
98

Common Calculations

PREN (Pitting Resistance) 28
31
Stiffness to Weight: Axial, points 12
13
Stiffness to Weight: Bending, points 22
23
Strength to Weight: Axial, points 61
71
Strength to Weight: Bending, points 39
44
Thermal Diffusivity, mm2/s 6.9
5.9
Thermal Shock Resistance, points 61
76

Alloy Composition

Carbon (C), % 0.42 to 0.53
0.78 to 1.1
Chromium (Cr), % 2.5 to 3.5
3.8 to 4.5
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 78 to 82.4
78.5 to 83.4
Manganese (Mn), % 0.15 to 0.4
0.15 to 0.4
Molybdenum (Mo), % 0
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 0.4
0.2 to 0.45
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 14 to 16
5.5 to 6.8
Vanadium (V), % 0.4 to 0.6
1.8 to 2.2