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SAE-AISI M6 Steel vs. S44401 Stainless Steel

Both SAE-AISI M6 steel and S44401 stainless steel are iron alloys. They have 78% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M6 steel and the bottom bar is S44401 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
78
Tensile Strength: Ultimate (UTS), MPa 840 to 2210
480

Thermal Properties

Latent Heat of Fusion, J/g 260
280
Melting Completion (Liquidus), °C 1560
1460
Melting Onset (Solidus), °C 1510
1420
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 17
22
Thermal Expansion, µm/m-K 12
10

Otherwise Unclassified Properties

Base Metal Price, % relative 39
12
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.0
2.9
Embodied Energy, MJ/kg 120
40
Embodied Water, L/kg 160
130

Common Calculations

PREN (Pitting Resistance) 28
26
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28 to 73
17
Strength to Weight: Bending, points 24 to 45
18
Thermal Diffusivity, mm2/s 4.7
5.9
Thermal Shock Resistance, points 26 to 68
17

Alloy Composition

Carbon (C), % 0.75 to 0.85
0 to 0.025
Chromium (Cr), % 3.8 to 4.5
17.5 to 19.5
Cobalt (Co), % 11 to 13
0
Iron (Fe), % 68.8 to 74.6
75.1 to 80.6
Manganese (Mn), % 0.15 to 0.4
0 to 1.0
Molybdenum (Mo), % 4.5 to 5.5
1.8 to 2.5
Nickel (Ni), % 0
0 to 1.0
Nitrogen (N), % 0
0 to 0.035
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.45
0
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0
0.2 to 0.8
Tungsten (W), % 3.8 to 4.8
0
Vanadium (V), % 1.3 to 1.7
0