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Hardened SAE-AISI D7 vs. Hardened SAE-AISI M2

Both hardened SAE-AISI D7 and hardened SAE-AISI M2 are iron alloys. Both are furnished in the hardened (H) condition. They have 88% of their average alloy composition in common.

For each property being compared, the top bar is hardened SAE-AISI D7 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 0.28
0.29
Rockwell C Hardness 65
66
Shear Modulus, GPa 73
77
Tensile Strength: Ultimate (UTS), MPa 2120
2150

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Melting Completion (Liquidus), °C 1440
1610
Melting Onset (Solidus), °C 1400
1570
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 27
22
Thermal Expansion, µm/m-K 11
10

Otherwise Unclassified Properties

Base Metal Price, % relative 10
24
Density, g/cm3 7.6
8.4
Embodied Carbon, kg CO2/kg material 11
8.8
Embodied Energy, MJ/kg 180
130
Embodied Water, L/kg 130
98

Common Calculations

PREN (Pitting Resistance) 16
31
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 78
71
Strength to Weight: Bending, points 48
44
Thermal Diffusivity, mm2/s 7.4
5.9
Thermal Shock Resistance, points 72
76

Alloy Composition

Carbon (C), % 2.2 to 2.5
0.78 to 1.1
Chromium (Cr), % 11.5 to 13.5
3.8 to 4.5
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 76.6 to 81.9
78.5 to 83.4
Manganese (Mn), % 0 to 0.6
0.15 to 0.4
Molybdenum (Mo), % 0.7 to 1.2
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 to 0.6
0.2 to 0.45
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
5.5 to 6.8
Vanadium (V), % 3.8 to 4.4
1.8 to 2.2