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SAE-AISI P21 Steel vs. S32808 Stainless Steel

Both SAE-AISI P21 steel and S32808 stainless steel are iron alloys. They have 66% 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 P21 steel and the bottom bar is S32808 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Poisson's Ratio 0.29
0.27
Rockwell C Hardness 35
28
Shear Modulus, GPa 73
81
Tensile Strength: Ultimate (UTS), MPa 1130
780

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Melting Completion (Liquidus), °C 1450
1470
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 41
14
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 9.0
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
24
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 2.3
4.0
Embodied Energy, MJ/kg 32
57
Embodied Water, L/kg 62
180

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 40
27
Strength to Weight: Bending, points 31
24
Thermal Diffusivity, mm2/s 11
3.8
Thermal Shock Resistance, points 37
21

Alloy Composition

Carbon (C), % 0.18 to 0.22
0 to 0.030
Chromium (Cr), % 0 to 0.5
27 to 27.9
Cobalt (Co), % 1.1 to 1.3
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 92.1 to 94.2
58.1 to 62.8
Manganese (Mn), % 0.35 to 0.72
0 to 1.1
Molybdenum (Mo), % 0
0.8 to 1.2
Nickel (Ni), % 3.9 to 4.3
7.0 to 8.2
Nitrogen (N), % 0
0.3 to 0.4
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.2 to 0.4
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.010
Tungsten (W), % 0
2.1 to 2.5
Vanadium (V), % 0.15 to 0.25
0