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SAE-AISI M2 Steel vs. SAE-AISI S7 Steel

Both SAE-AISI M2 steel and SAE-AISI S7 steel are iron alloys. They have 87% of their average alloy composition in common. There are 22 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 SAE-AISI M2 steel and the bottom bar is SAE-AISI S7 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 77
74
Tensile Strength: Ultimate (UTS), MPa 760 to 2150
670 to 2030

Thermal Properties

Latent Heat of Fusion, J/g 260
260
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
40
Thermal Expansion, µm/m-K 10
12

Otherwise Unclassified Properties

Base Metal Price, % relative 24
5.0
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.8
2.3
Embodied Energy, MJ/kg 130
31
Embodied Water, L/kg 98
65

Common Calculations

PREN (Pitting Resistance) 31
8.4
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 25 to 71
24 to 72
Strength to Weight: Bending, points 22 to 44
22 to 46
Thermal Diffusivity, mm2/s 5.9
11
Thermal Shock Resistance, points 27 to 76
22 to 66

Alloy Composition

Carbon (C), % 0.78 to 1.1
0.45 to 0.55
Chromium (Cr), % 3.8 to 4.5
3.0 to 3.5
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 78.5 to 83.4
91.6 to 94.9
Manganese (Mn), % 0.15 to 0.4
0.2 to 0.9
Molybdenum (Mo), % 4.5 to 5.5
1.3 to 1.8
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.2 to 0.45
0.2 to 1.0
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 0.3

Comparable Variants