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S21800 Stainless Steel vs. SAE-AISI M7 Steel

Both S21800 stainless steel and SAE-AISI M7 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 M7 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
760 to 2210

Thermal Properties

Latent Heat of Fusion, J/g 340
270
Melting Completion (Liquidus), °C 1360
1560
Melting Onset (Solidus), °C 1310
1510
Specific Heat Capacity, J/kg-K 500
450
Thermal Expansion, µm/m-K 16
12

Otherwise Unclassified Properties

Base Metal Price, % relative 15
18
Density, g/cm3 7.5
8.1
Embodied Carbon, kg CO2/kg material 3.1
8.9
Embodied Energy, MJ/kg 45
130
Embodied Water, L/kg 150
100

Common Calculations

PREN (Pitting Resistance) 19
35
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 27
26 to 76
Strength to Weight: Bending, points 24
23 to 47
Thermal Shock Resistance, points 17
24 to 69

Alloy Composition

Carbon (C), % 0 to 0.1
1.0 to 1.1
Chromium (Cr), % 16 to 18
3.5 to 4.0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 59.1 to 65.4
79.8 to 83.8
Manganese (Mn), % 7.0 to 9.0
0.15 to 0.4
Molybdenum (Mo), % 0
8.2 to 9.2
Nickel (Ni), % 8.0 to 9.0
0 to 0.3
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 0.55
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
1.4 to 2.1
Vanadium (V), % 0
1.8 to 2.3