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SAE-AISI M7 Steel vs. S21900 Stainless Steel

Both SAE-AISI M7 steel and S21900 stainless steel are iron alloys. They have 68% 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 M7 steel and the bottom bar is S21900 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 77
78
Tensile Strength: Ultimate (UTS), MPa 760 to 2210
710

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Melting Completion (Liquidus), °C 1560
1400
Melting Onset (Solidus), °C 1510
1350
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 28
14
Thermal Expansion, µm/m-K 12
17

Otherwise Unclassified Properties

Base Metal Price, % relative 18
15
Density, g/cm3 8.1
7.7
Embodied Carbon, kg CO2/kg material 8.9
3.0
Embodied Energy, MJ/kg 130
43
Embodied Water, L/kg 100
160

Common Calculations

PREN (Pitting Resistance) 35
25
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 26 to 76
26
Strength to Weight: Bending, points 23 to 47
23
Thermal Diffusivity, mm2/s 7.8
3.8
Thermal Shock Resistance, points 24 to 69
15

Alloy Composition

Carbon (C), % 1.0 to 1.1
0 to 0.080
Chromium (Cr), % 3.5 to 4.0
19 to 21.5
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 79.8 to 83.8
59.4 to 67.4
Manganese (Mn), % 0.15 to 0.4
8.0 to 10
Molybdenum (Mo), % 8.2 to 9.2
0
Nickel (Ni), % 0 to 0.3
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0.2 to 0.55
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.4 to 2.1
0
Vanadium (V), % 1.8 to 2.3
0