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Annealed SAE-AISI M2 vs. Annealed SAE-AISI S2

Both annealed SAE-AISI M2 and annealed SAE-AISI S2 are iron alloys. Both are furnished in the annealed condition. They have 83% 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 S2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230
200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.29
Rockwell B Hardness 99
95
Shear Modulus, GPa 77
72
Tensile Strength: Ultimate (UTS), MPa 760
670

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Melting Completion (Liquidus), °C 1610
1450
Melting Onset (Solidus), °C 1570
1410
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 22
44
Thermal Expansion, µm/m-K 10
11

Otherwise Unclassified Properties

Base Metal Price, % relative 24
2.6
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.8
2.1
Embodied Energy, MJ/kg 130
30
Embodied Water, L/kg 98
49

Common Calculations

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

Alloy Composition

Carbon (C), % 0.78 to 1.1
0.4 to 0.55
Chromium (Cr), % 3.8 to 4.5
0
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 78.5 to 83.4
96 to 98.1
Manganese (Mn), % 0.15 to 0.4
0.3 to 0.5
Molybdenum (Mo), % 4.5 to 5.5
0.3 to 0.6
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
0.9 to 1.2
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 5.5 to 6.8
0
Vanadium (V), % 1.8 to 2.2
0 to 0.5