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SAE-AISI M4 Steel vs. AISI 420F Stainless Steel

Both SAE-AISI M4 steel and AISI 420F stainless steel are iron alloys. They have 84% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (11, 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 420F stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 76
76
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
740

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Melting Completion (Liquidus), °C 1610
1440
Melting Onset (Solidus), °C 1560
1390
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 25
25
Thermal Expansion, µm/m-K 12
10

Otherwise Unclassified Properties

Base Metal Price, % relative 25
7.0
Density, g/cm3 8.3
7.7
Embodied Carbon, kg CO2/kg material 14
2.0
Embodied Energy, MJ/kg 210
28
Embodied Water, L/kg 110
100

Common Calculations

PREN (Pitting Resistance) 30
14
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26 to 72
27
Strength to Weight: Bending, points 23 to 45
23
Thermal Diffusivity, mm2/s 6.9
6.8
Thermal Shock Resistance, points 24 to 68
27

Alloy Composition

Carbon (C), % 1.3 to 1.4
0.3 to 0.4
Chromium (Cr), % 3.8 to 4.8
12 to 14
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 75.9 to 81.4
82.4 to 87.6
Manganese (Mn), % 0.15 to 0.4
0 to 1.3
Molybdenum (Mo), % 4.3 to 5.5
0 to 0.5
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.060
Silicon (Si), % 0.2 to 0.45
0 to 1.0
Sulfur (S), % 0 to 0.030
0.15 to 0.35
Tungsten (W), % 5.3 to 6.5
0
Vanadium (V), % 3.8 to 4.5
0