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S31655 Stainless Steel vs. SAE-AISI A8 Steel

Both S31655 stainless steel and SAE-AISI A8 steel are iron alloys. They have 75% 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 S31655 stainless steel and the bottom bar is SAE-AISI A8 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
74
Tensile Strength: Ultimate (UTS), MPa 710
700 to 1920

Thermal Properties

Latent Heat of Fusion, J/g 290
270
Melting Completion (Liquidus), °C 1430
1480
Melting Onset (Solidus), °C 1380
1430
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
37
Thermal Expansion, µm/m-K 16
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
8.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
9.5

Otherwise Unclassified Properties

Base Metal Price, % relative 17
8.5
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 3.3
2.3
Embodied Energy, MJ/kg 46
31
Embodied Water, L/kg 160
73

Common Calculations

PREN (Pitting Resistance) 27
12
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 25
25 to 68
Strength to Weight: Bending, points 23
22 to 44
Thermal Diffusivity, mm2/s 4.0
9.9
Thermal Shock Resistance, points 16
22 to 62

Alloy Composition

Carbon (C), % 0 to 0.030
0.5 to 0.6
Chromium (Cr), % 19.5 to 21.5
4.8 to 5.5
Copper (Cu), % 0 to 1.0
0 to 0.25
Iron (Fe), % 63.2 to 71.9
88.5 to 91.9
Manganese (Mn), % 0 to 2.0
0 to 0.5
Molybdenum (Mo), % 0.5 to 1.5
1.2 to 1.7
Nickel (Ni), % 8.0 to 9.5
0 to 0.3
Nitrogen (N), % 0.14 to 0.25
0
Phosphorus (P), % 0 to 0.045
0 to 0.030
Silicon (Si), % 0 to 1.0
0.75 to 1.1
Sulfur (S), % 0 to 0.015
0 to 0.030
Tungsten (W), % 0
1.0 to 1.5