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SAE-AISI A9 Steel vs. S31730 Stainless Steel

Both SAE-AISI A9 steel and S31730 stainless steel are iron alloys. They have 66% of their average alloy composition in common. There are 20 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI A9 steel and the bottom bar is S31730 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
77
Tensile Strength: Ultimate (UTS), MPa 770 to 2030
540

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1410
1390
Specific Heat Capacity, J/kg-K 470
470
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
24
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 4.7
4.6
Embodied Energy, MJ/kg 70
63
Embodied Water, L/kg 82
180

Common Calculations

PREN (Pitting Resistance) 10
30
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 28 to 73
19
Strength to Weight: Bending, points 24 to 46
18
Thermal Shock Resistance, points 25 to 66
12

Alloy Composition

Carbon (C), % 0.45 to 0.55
0 to 0.030
Chromium (Cr), % 4.8 to 5.5
17 to 19
Copper (Cu), % 0 to 0.25
4.0 to 5.0
Iron (Fe), % 87 to 90.5
52.4 to 61
Manganese (Mn), % 0 to 0.5
0 to 2.0
Molybdenum (Mo), % 1.3 to 1.8
3.0 to 4.0
Nickel (Ni), % 1.3 to 1.8
15 to 16.5
Nitrogen (N), % 0
0 to 0.045
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 1.0 to 1.2
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.010
Vanadium (V), % 0.8 to 1.4
0