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SAE-AISI A8 Steel vs. S21600 Stainless Steel

Both SAE-AISI A8 steel and S21600 stainless steel are iron alloys. They have 70% 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 SAE-AISI A8 steel and the bottom bar is S21600 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
79
Tensile Strength: Ultimate (UTS), MPa 700 to 1920
710

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Melting Completion (Liquidus), °C 1480
1420
Melting Onset (Solidus), °C 1430
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Expansion, µm/m-K 12
17

Otherwise Unclassified Properties

Base Metal Price, % relative 8.5
17
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 2.3
3.6
Embodied Energy, MJ/kg 31
50
Embodied Water, L/kg 73
160

Common Calculations

PREN (Pitting Resistance) 12
34
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 25 to 68
25
Strength to Weight: Bending, points 22 to 44
23
Thermal Shock Resistance, points 22 to 62
15

Alloy Composition

Carbon (C), % 0.5 to 0.6
0 to 0.080
Chromium (Cr), % 4.8 to 5.5
17.5 to 22
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 88.5 to 91.9
57.6 to 67.8
Manganese (Mn), % 0 to 0.5
7.5 to 9.0
Molybdenum (Mo), % 1.2 to 1.7
2.0 to 3.0
Nickel (Ni), % 0 to 0.3
5.0 to 7.0
Nitrogen (N), % 0
0.25 to 0.5
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0.75 to 1.1
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 1.0 to 1.5
0