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SAE-AISI A9 Steel vs. S32750 Stainless Steel

Both SAE-AISI A9 steel and S32750 stainless steel are iron alloys. They have 72% 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 A9 steel and the bottom bar is S32750 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 74
81
Tensile Strength: Ultimate (UTS), MPa 770 to 2030
860

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1410
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 35
15
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 9.2
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
21
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 4.7
4.1
Embodied Energy, MJ/kg 70
56
Embodied Water, L/kg 82
180

Common Calculations

PREN (Pitting Resistance) 10
43
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 28 to 73
31
Strength to Weight: Bending, points 24 to 46
26
Thermal Diffusivity, mm2/s 9.6
4.0
Thermal Shock Resistance, points 25 to 66
25

Alloy Composition

Carbon (C), % 0.45 to 0.55
0 to 0.030
Chromium (Cr), % 4.8 to 5.5
24 to 26
Copper (Cu), % 0 to 0.25
0 to 0.5
Iron (Fe), % 87 to 90.5
58.1 to 66.8
Manganese (Mn), % 0 to 0.5
0 to 1.2
Molybdenum (Mo), % 1.3 to 1.8
3.0 to 5.0
Nickel (Ni), % 1.3 to 1.8
6.0 to 8.0
Nitrogen (N), % 0
0.24 to 0.32
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 1.0 to 1.2
0 to 0.8
Sulfur (S), % 0 to 0.030
0 to 0.020
Vanadium (V), % 0.8 to 1.4
0