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SAE-AISI M1 Steel vs. AISI 418 Stainless Steel

Both SAE-AISI M1 steel and AISI 418 stainless steel are iron alloys. They have 88% 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 M1 steel and the bottom bar is AISI 418 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 730 to 2140
1100

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Melting Completion (Liquidus), °C 1560
1500
Melting Onset (Solidus), °C 1510
1460
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 29
25
Thermal Expansion, µm/m-K 12
10

Otherwise Unclassified Properties

Base Metal Price, % relative 18
15
Density, g/cm3 8.1
8.0
Embodied Carbon, kg CO2/kg material 7.0
2.9
Embodied Energy, MJ/kg 99
41
Embodied Water, L/kg 98
110

Common Calculations

PREN (Pitting Resistance) 35
19
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 25 to 73
38
Strength to Weight: Bending, points 22 to 45
29
Thermal Diffusivity, mm2/s 8.0
6.7
Thermal Shock Resistance, points 23 to 66
40

Alloy Composition

Carbon (C), % 0.78 to 0.88
0.15 to 0.2
Chromium (Cr), % 3.5 to 4.0
12 to 14
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 81 to 84.8
78.5 to 83.6
Manganese (Mn), % 0.15 to 0.4
0 to 0.5
Molybdenum (Mo), % 8.2 to 9.2
0 to 0.5
Nickel (Ni), % 0 to 0.3
1.8 to 2.2
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.5
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.4 to 2.1
2.5 to 3.5
Vanadium (V), % 1.0 to 1.4
0