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SAE-AISI M44 Steel vs. S81921 Stainless Steel

Both SAE-AISI M44 steel and S81921 stainless steel are iron alloys. They have 75% 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 M44 steel and the bottom bar is S81921 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 78
79
Tensile Strength: Ultimate (UTS), MPa 870 to 2290
710

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Melting Completion (Liquidus), °C 1590
1430
Melting Onset (Solidus), °C 1540
1390
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 14
15
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 43
14
Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 9.9
2.9
Embodied Energy, MJ/kg 150
41
Embodied Water, L/kg 170
150

Common Calculations

PREN (Pitting Resistance) 35
28
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28 to 75
25
Strength to Weight: Bending, points 24 to 46
23
Thermal Diffusivity, mm2/s 3.7
4.0
Thermal Shock Resistance, points 27 to 70
20

Alloy Composition

Carbon (C), % 1.1 to 1.2
0 to 0.030
Chromium (Cr), % 4.0 to 4.8
19 to 22
Cobalt (Co), % 11 to 12.3
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 65.3 to 70.6
66.7 to 75.9
Manganese (Mn), % 0.2 to 0.4
2.0 to 4.0
Molybdenum (Mo), % 6.0 to 7.0
1.0 to 2.0
Nickel (Ni), % 0 to 0.3
2.0 to 4.0
Nitrogen (N), % 0
0.14 to 0.2
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.3 to 0.55
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 5.0 to 5.8
0
Vanadium (V), % 1.9 to 2.2
0