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SAE-AISI M7 Steel vs. S42300 Stainless Steel

Both SAE-AISI M7 steel and S42300 stainless steel are iron alloys. They have 90% of their average alloy composition in common. There are 22 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 M7 steel and the bottom bar is S42300 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
77
Tensile Strength: Ultimate (UTS), MPa 760 to 2210
1100

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Melting Completion (Liquidus), °C 1560
1470
Melting Onset (Solidus), °C 1510
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 28
25
Thermal Expansion, µm/m-K 12
10

Otherwise Unclassified Properties

Base Metal Price, % relative 18
9.5
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 8.9
3.2
Embodied Energy, MJ/kg 130
44
Embodied Water, L/kg 100
110

Common Calculations

PREN (Pitting Resistance) 35
21
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 26 to 76
39
Strength to Weight: Bending, points 23 to 47
30
Thermal Diffusivity, mm2/s 7.8
6.8
Thermal Shock Resistance, points 24 to 69
40

Alloy Composition

Carbon (C), % 1.0 to 1.1
0.27 to 0.32
Chromium (Cr), % 3.5 to 4.0
11 to 12
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 79.8 to 83.8
82 to 85.1
Manganese (Mn), % 0.15 to 0.4
1.0 to 1.4
Molybdenum (Mo), % 8.2 to 9.2
2.5 to 3.0
Nickel (Ni), % 0 to 0.3
0 to 0.5
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0.2 to 0.55
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.025
Tungsten (W), % 1.4 to 2.1
0
Vanadium (V), % 1.8 to 2.3
0.2 to 0.3