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SAE-AISI M3 Class 2 Steel vs. SAE-AISI S7 Steel

Both SAE-AISI M3 class 2 steel and SAE-AISI S7 steel are iron alloys. They have 85% 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 M3 class 2 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 770 to 2210
670 to 2030

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Melting Completion (Liquidus), °C 1620
1460
Melting Onset (Solidus), °C 1570
1420
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 26
40
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 25
5.0
Density, g/cm3 8.3
7.8
Embodied Carbon, kg CO2/kg material 12
2.3
Embodied Energy, MJ/kg 180
31
Embodied Water, L/kg 110
65

Common Calculations

PREN (Pitting Resistance) 33
8.4
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26 to 74
24 to 72
Strength to Weight: Bending, points 22 to 45
22 to 46
Thermal Diffusivity, mm2/s 7.2
11
Thermal Shock Resistance, points 24 to 69
22 to 66

Alloy Composition

Carbon (C), % 1.2 to 1.3
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), % 75.8 to 82.3
91.6 to 94.9
Manganese (Mn), % 0.15 to 0.4
0.2 to 0.9
Molybdenum (Mo), % 4.8 to 6.5
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), % 5.0 to 6.8
0
Vanadium (V), % 2.8 to 3.8
0 to 0.3

Comparable Variants