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SAE-AISI P21 Steel vs. N08801 Stainless Steel

Both SAE-AISI P21 steel and N08801 stainless steel are iron alloys. They have 50% of their average alloy composition in common. There are 23 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 N08801 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 73
77
Tensile Strength: Ultimate (UTS), MPa 1130
860

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Melting Completion (Liquidus), °C 1450
1390
Melting Onset (Solidus), °C 1410
1360
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 41
12
Thermal Expansion, µm/m-K 12
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 9.0
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
30
Density, g/cm3 7.9
8.0
Embodied Carbon, kg CO2/kg material 2.3
5.5
Embodied Energy, MJ/kg 32
79
Embodied Water, L/kg 62
200

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 40
30
Strength to Weight: Bending, points 31
25
Thermal Diffusivity, mm2/s 11
3.3
Thermal Shock Resistance, points 37
20

Alloy Composition

Carbon (C), % 0.18 to 0.22
0 to 0.1
Chromium (Cr), % 0 to 0.5
19 to 22
Cobalt (Co), % 1.1 to 1.3
0
Copper (Cu), % 0 to 0.25
0 to 0.5
Iron (Fe), % 92.1 to 94.2
39.5 to 50.3
Manganese (Mn), % 0.35 to 0.72
0 to 1.5
Nickel (Ni), % 3.9 to 4.3
30 to 34
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.2 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.015
Titanium (Ti), % 0
0.75 to 1.5
Vanadium (V), % 0.15 to 0.25
0