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SAE-AISI M6 Steel vs. S31100 Stainless Steel

Both SAE-AISI M6 steel and S31100 stainless steel are iron alloys. They have 71% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M6 steel and the bottom bar is S31100 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 77
79
Tensile Strength: Ultimate (UTS), MPa 840 to 2210
1000

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Melting Completion (Liquidus), °C 1560
1420
Melting Onset (Solidus), °C 1510
1380
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 17
16
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 39
16
Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.0
3.1
Embodied Energy, MJ/kg 120
44
Embodied Water, L/kg 160
170

Common Calculations

PREN (Pitting Resistance) 28
26
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28 to 73
36
Strength to Weight: Bending, points 24 to 45
29
Thermal Diffusivity, mm2/s 4.7
4.2
Thermal Shock Resistance, points 26 to 68
28

Alloy Composition

Carbon (C), % 0.75 to 0.85
0 to 0.060
Chromium (Cr), % 3.8 to 4.5
25 to 27
Cobalt (Co), % 11 to 13
0
Iron (Fe), % 68.8 to 74.6
63.6 to 69
Manganese (Mn), % 0.15 to 0.4
0 to 1.0
Molybdenum (Mo), % 4.5 to 5.5
0
Nickel (Ni), % 0
6.0 to 7.0
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0.2 to 0.45
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0
0 to 0.25
Tungsten (W), % 3.8 to 4.8
0
Vanadium (V), % 1.3 to 1.7
0