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SAE-AISI M4 Steel vs. S82031 Stainless Steel

Both SAE-AISI M4 steel and S82031 stainless steel are iron alloys. They have 79% 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 S82031 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
78
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
780

Thermal Properties

Latent Heat of Fusion, J/g 260
290
Melting Completion (Liquidus), °C 1610
1430
Melting Onset (Solidus), °C 1560
1390
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 25
15
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 25
13
Density, g/cm3 8.3
7.7
Embodied Carbon, kg CO2/kg material 14
2.8
Embodied Energy, MJ/kg 210
39
Embodied Water, L/kg 110
150

Common Calculations

PREN (Pitting Resistance) 30
27
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26 to 72
28
Strength to Weight: Bending, points 23 to 45
24
Thermal Diffusivity, mm2/s 6.9
3.9
Thermal Shock Resistance, points 24 to 68
22

Alloy Composition

Carbon (C), % 1.3 to 1.4
0 to 0.050
Chromium (Cr), % 3.8 to 4.8
19 to 22
Copper (Cu), % 0 to 0.25
0 to 1.0
Iron (Fe), % 75.9 to 81.4
68 to 78.3
Manganese (Mn), % 0.15 to 0.4
0 to 2.5
Molybdenum (Mo), % 4.3 to 5.5
0.6 to 1.4
Nickel (Ni), % 0 to 0.3
2.0 to 4.0
Nitrogen (N), % 0
0.14 to 0.24
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.45
0 to 0.8
Sulfur (S), % 0 to 0.030
0 to 0.0050
Tungsten (W), % 5.3 to 6.5
0
Vanadium (V), % 3.8 to 4.5
0