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S21800 Stainless Steel vs. SAE-AISI M6 Steel

Both S21800 stainless steel and SAE-AISI M6 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 S21800 stainless steel and the bottom bar is SAE-AISI M6 steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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