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SAE-AISI A8 Steel vs. S82121 Stainless Steel

Both SAE-AISI A8 steel and S82121 stainless steel are iron alloys. They have 78% 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 A8 steel and the bottom bar is S82121 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 74
78
Tensile Strength: Ultimate (UTS), MPa 700 to 1920
730

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Melting Completion (Liquidus), °C 1480
1430
Melting Onset (Solidus), °C 1430
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 37
15
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.3
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 9.5
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 8.5
14
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 2.3
2.8
Embodied Energy, MJ/kg 31
40
Embodied Water, L/kg 73
150

Common Calculations

PREN (Pitting Resistance) 12
28
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 25 to 68
26
Strength to Weight: Bending, points 22 to 44
23
Thermal Diffusivity, mm2/s 9.9
4.0
Thermal Shock Resistance, points 22 to 62
20

Alloy Composition

Carbon (C), % 0.5 to 0.6
0 to 0.035
Chromium (Cr), % 4.8 to 5.5
21 to 23
Copper (Cu), % 0 to 0.25
0.2 to 1.2
Iron (Fe), % 88.5 to 91.9
66.7 to 75.4
Manganese (Mn), % 0 to 0.5
1.0 to 2.5
Molybdenum (Mo), % 1.2 to 1.7
0.3 to 1.3
Nickel (Ni), % 0 to 0.3
2.0 to 4.0
Nitrogen (N), % 0
0.15 to 0.25
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.75 to 1.1
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.010
Tungsten (W), % 1.0 to 1.5
0