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SAE-AISI M4 Steel vs. AISI 418 Stainless Steel

Both SAE-AISI M4 steel and AISI 418 stainless steel are iron alloys. They have 87% 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 M4 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 76
77
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
1100

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Melting Completion (Liquidus), °C 1610
1500
Melting Onset (Solidus), °C 1560
1460
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 25
25
Thermal Expansion, µm/m-K 12
10

Otherwise Unclassified Properties

Base Metal Price, % relative 25
15
Density, g/cm3 8.3
8.0
Embodied Carbon, kg CO2/kg material 14
2.9
Embodied Energy, MJ/kg 210
41
Embodied Water, L/kg 110
110

Common Calculations

PREN (Pitting Resistance) 30
19
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26 to 72
38
Strength to Weight: Bending, points 23 to 45
29
Thermal Diffusivity, mm2/s 6.9
6.7
Thermal Shock Resistance, points 24 to 68
40

Alloy Composition

Carbon (C), % 1.3 to 1.4
0.15 to 0.2
Chromium (Cr), % 3.8 to 4.8
12 to 14
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 75.9 to 81.4
78.5 to 83.6
Manganese (Mn), % 0.15 to 0.4
0 to 0.5
Molybdenum (Mo), % 4.3 to 5.5
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 0.45
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 5.3 to 6.5
2.5 to 3.5
Vanadium (V), % 3.8 to 4.5
0