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SAE-AISI M6 Steel vs. S21800 Stainless Steel

Both SAE-AISI M6 steel and S21800 stainless steel are iron alloys. They have 67% of their average alloy composition in common. There are 20 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M6 steel and the bottom bar is S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 77
75
Tensile Strength: Ultimate (UTS), MPa 840 to 2210
740

Thermal Properties

Latent Heat of Fusion, J/g 260
340
Melting Completion (Liquidus), °C 1560
1360
Melting Onset (Solidus), °C 1510
1310
Specific Heat Capacity, J/kg-K 440
500
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 39
15
Density, g/cm3 8.4
7.5
Embodied Carbon, kg CO2/kg material 8.0
3.1
Embodied Energy, MJ/kg 120
45
Embodied Water, L/kg 160
150

Common Calculations

PREN (Pitting Resistance) 28
19
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
26
Strength to Weight: Axial, points 28 to 73
27
Strength to Weight: Bending, points 24 to 45
24
Thermal Shock Resistance, points 26 to 68
17

Alloy Composition

Carbon (C), % 0.75 to 0.85
0 to 0.1
Chromium (Cr), % 3.8 to 4.5
16 to 18
Cobalt (Co), % 11 to 13
0
Iron (Fe), % 68.8 to 74.6
59.1 to 65.4
Manganese (Mn), % 0.15 to 0.4
7.0 to 9.0
Molybdenum (Mo), % 4.5 to 5.5
0
Nickel (Ni), % 0
8.0 to 9.0
Nitrogen (N), % 0
0.080 to 0.18
Phosphorus (P), % 0 to 0.030
0 to 0.060
Silicon (Si), % 0.2 to 0.45
3.5 to 4.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 3.8 to 4.8
0
Vanadium (V), % 1.3 to 1.7
0