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S31727 Stainless Steel vs. SAE-AISI A8 Steel

Both S31727 stainless steel and SAE-AISI A8 steel are iron alloys. They have 65% of their average alloy composition in common. There are 20 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.

For each property being compared, the top bar is S31727 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 630
700 to 1920

Thermal Properties

Latent Heat of Fusion, J/g 290
270
Melting Completion (Liquidus), °C 1440
1480
Melting Onset (Solidus), °C 1390
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Expansion, µm/m-K 16
12

Otherwise Unclassified Properties

Base Metal Price, % relative 24
8.5
Density, g/cm3 8.0
7.9
Embodied Carbon, kg CO2/kg material 4.7
2.3
Embodied Energy, MJ/kg 64
31
Embodied Water, L/kg 180
73

Common Calculations

PREN (Pitting Resistance) 35
12
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 22
25 to 68
Strength to Weight: Bending, points 20
22 to 44
Thermal Shock Resistance, points 14
22 to 62

Alloy Composition

Carbon (C), % 0 to 0.030
0.5 to 0.6
Chromium (Cr), % 17.5 to 19
4.8 to 5.5
Copper (Cu), % 2.8 to 4.0
0 to 0.25
Iron (Fe), % 53.7 to 61.3
88.5 to 91.9
Manganese (Mn), % 0 to 1.0
0 to 0.5
Molybdenum (Mo), % 3.8 to 4.5
1.2 to 1.7
Nickel (Ni), % 14.5 to 16.5
0 to 0.3
Nitrogen (N), % 0.15 to 0.21
0
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0 to 1.0
0.75 to 1.1
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
1.0 to 1.5