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Annealed SAE-AISI M2 vs. Annealed SAE-AISI O1

Both annealed SAE-AISI M2 and annealed SAE-AISI O1 are iron alloys. Both are furnished in the annealed condition. They have 84% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is annealed SAE-AISI M2 and the bottom bar is annealed SAE-AISI O1.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230
190
Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.29
Rockwell B Hardness 99
93
Shear Modulus, GPa 77
72
Tensile Strength: Ultimate (UTS), MPa 760
640

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Melting Completion (Liquidus), °C 1610
1460
Melting Onset (Solidus), °C 1570
1420
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 22
43
Thermal Expansion, µm/m-K 10
12

Otherwise Unclassified Properties

Base Metal Price, % relative 24
3.4
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.8
1.9
Embodied Energy, MJ/kg 130
27
Embodied Water, L/kg 98
51

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 25
23
Strength to Weight: Bending, points 22
21
Thermal Diffusivity, mm2/s 5.9
12
Thermal Shock Resistance, points 27
21

Alloy Composition

Carbon (C), % 0.78 to 1.1
0.85 to 1.0
Chromium (Cr), % 3.8 to 4.5
0.4 to 0.6
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 78.5 to 83.4
95 to 97.4
Manganese (Mn), % 0.15 to 0.4
1.0 to 1.4
Molybdenum (Mo), % 4.5 to 5.5
0
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 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 5.5 to 6.8
0.4 to 0.6
Vanadium (V), % 1.8 to 2.2
0 to 0.3