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SAE-AISI A8 Steel vs. S20431 Stainless Steel

Both SAE-AISI A8 steel and S20431 stainless steel are iron alloys. They have 77% of their average alloy composition in common. There are 24 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 A8 steel and the bottom bar is S20431 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
76
Tensile Strength: Ultimate (UTS), MPa 700 to 1920
710

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Melting Completion (Liquidus), °C 1480
1400
Melting Onset (Solidus), °C 1430
1360
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 37
15
Thermal Expansion, µm/m-K 12
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.3
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 9.5
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 8.5
12
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 2.3
2.5
Embodied Energy, MJ/kg 31
36
Embodied Water, L/kg 73
140

Common Calculations

PREN (Pitting Resistance) 12
20
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 25 to 68
25
Strength to Weight: Bending, points 22 to 44
23
Thermal Diffusivity, mm2/s 9.9
4.0
Thermal Shock Resistance, points 22 to 62
15

Alloy Composition

Carbon (C), % 0.5 to 0.6
0 to 0.12
Chromium (Cr), % 4.8 to 5.5
17 to 18
Copper (Cu), % 0 to 0.25
1.5 to 3.5
Iron (Fe), % 88.5 to 91.9
66.1 to 74.4
Manganese (Mn), % 0 to 0.5
5.0 to 7.0
Molybdenum (Mo), % 1.2 to 1.7
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), % 0.75 to 1.1
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.0 to 1.5
0