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SAE-AISI A7 Steel vs. S32803 Stainless Steel

Both SAE-AISI A7 steel and S32803 stainless steel are iron alloys. They have 72% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI A7 steel and the bottom bar is S32803 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 72
81
Tensile Strength: Ultimate (UTS), MPa 800 to 2150
680

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Melting Completion (Liquidus), °C 1470
1450
Melting Onset (Solidus), °C 1430
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 37
16
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Base Metal Price, % relative 10
19
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 13
3.7
Embodied Energy, MJ/kg 200
53
Embodied Water, L/kg 100
180

Common Calculations

PREN (Pitting Resistance) 11
36
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 29 to 77
25
Strength to Weight: Bending, points 25 to 48
22
Thermal Diffusivity, mm2/s 10
4.4
Thermal Shock Resistance, points 27 to 72
22

Alloy Composition

Carbon (C), % 2.0 to 2.9
0 to 0.015
Chromium (Cr), % 5.0 to 5.8
28 to 29
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 81.4 to 87.7
62.9 to 67.1
Manganese (Mn), % 0 to 0.8
0 to 0.5
Molybdenum (Mo), % 0.9 to 1.4
1.8 to 2.5
Nickel (Ni), % 0 to 0.3
3.0 to 4.0
Niobium (Nb), % 0
0.15 to 0.5
Nitrogen (N), % 0
0 to 0.020
Phosphorus (P), % 0 to 0.030
0 to 0.020
Silicon (Si), % 0 to 0.5
0 to 0.55
Sulfur (S), % 0 to 0.030
0 to 0.0035
Tungsten (W), % 0.5 to 1.5
0
Vanadium (V), % 3.9 to 5.2
0