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SAE-AISI M47 Steel vs. S20431 Stainless Steel

Both SAE-AISI M47 steel and S20431 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 M47 steel and the bottom bar is S20431 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
76
Tensile Strength: Ultimate (UTS), MPa 810 to 2310
710

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Melting Completion (Liquidus), °C 1540
1400
Melting Onset (Solidus), °C 1500
1360
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 23
15
Thermal Expansion, µm/m-K 11
17

Otherwise Unclassified Properties

Base Metal Price, % relative 26
12
Density, g/cm3 8.1
7.7
Embodied Carbon, kg CO2/kg material 7.4
2.5
Embodied Energy, MJ/kg 100
36
Embodied Water, L/kg 120
140

Common Calculations

PREN (Pitting Resistance) 38
20
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 28 to 79
25
Strength to Weight: Bending, points 24 to 48
23
Thermal Diffusivity, mm2/s 6.3
4.0
Thermal Shock Resistance, points 27 to 77
15

Alloy Composition

Carbon (C), % 1.1 to 1.2
0 to 0.12
Chromium (Cr), % 3.5 to 4.0
17 to 18
Cobalt (Co), % 4.8 to 5.3
0
Copper (Cu), % 0 to 0.25
1.5 to 3.5
Iron (Fe), % 78.7 to 85
66.1 to 74.4
Manganese (Mn), % 0.15 to 0.4
5.0 to 7.0
Molybdenum (Mo), % 9.3 to 10
0
Nickel (Ni), % 0 to 0.3
2.0 to 4.0
Nitrogen (N), % 0
0.1 to 0.25
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0.2 to 0.45
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.3 to 1.8
0
Vanadium (V), % 1.2 to 1.4
0