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SAE-AISI M1 Steel vs. S44401 Stainless Steel

Both SAE-AISI M1 steel and S44401 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 (10, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M1 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 730 to 2140
480

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Melting Completion (Liquidus), °C 1560
1460
Melting Onset (Solidus), °C 1510
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 29
22
Thermal Expansion, µm/m-K 12
10

Otherwise Unclassified Properties

Base Metal Price, % relative 18
12
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 7.0
2.9
Embodied Energy, MJ/kg 99
40
Embodied Water, L/kg 98
130

Common Calculations

PREN (Pitting Resistance) 35
26
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 25 to 73
17
Strength to Weight: Bending, points 22 to 45
18
Thermal Diffusivity, mm2/s 8.0
5.9
Thermal Shock Resistance, points 23 to 66
17

Alloy Composition

Carbon (C), % 0.78 to 0.88
0 to 0.025
Chromium (Cr), % 3.5 to 4.0
17.5 to 19.5
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 81 to 84.8
75.1 to 80.6
Manganese (Mn), % 0.15 to 0.4
0 to 1.0
Molybdenum (Mo), % 8.2 to 9.2
1.8 to 2.5
Nickel (Ni), % 0 to 0.3
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 0.5
0
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0
0.2 to 0.8
Tungsten (W), % 1.4 to 2.1
0
Vanadium (V), % 1.0 to 1.4
0