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SAE-AISI M42 Steel vs. AISI 418 Stainless Steel

Both SAE-AISI M42 steel and AISI 418 stainless steel are iron alloys. They have 85% 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 M42 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 78
77
Tensile Strength: Ultimate (UTS), MPa 810 to 2310
1100

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Melting Completion (Liquidus), °C 1540
1500
Melting Onset (Solidus), °C 1490
1460
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 20
25
Thermal Expansion, µm/m-K 12
10

Otherwise Unclassified Properties

Base Metal Price, % relative 30
15
Density, g/cm3 8.2
8.0
Embodied Carbon, kg CO2/kg material 7.4
2.9
Embodied Energy, MJ/kg 100
41
Embodied Water, L/kg 140
110

Common Calculations

PREN (Pitting Resistance) 38
19
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 28 to 79
38
Strength to Weight: Bending, points 24 to 48
29
Thermal Diffusivity, mm2/s 5.4
6.7
Thermal Shock Resistance, points 25 to 71
40

Alloy Composition

Carbon (C), % 1.1 to 1.2
0.15 to 0.2
Chromium (Cr), % 3.5 to 4.3
12 to 14
Cobalt (Co), % 7.8 to 8.8
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 76.3 to 81
78.5 to 83.6
Manganese (Mn), % 0.15 to 0.4
0 to 0.5
Molybdenum (Mo), % 9.0 to 10
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), % 0.15 to 0.65
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.2 to 1.9
2.5 to 3.5
Vanadium (V), % 1.0 to 1.4
0