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S31266 Stainless Steel vs. SAE-AISI P21 Steel

Both S31266 stainless steel and SAE-AISI P21 steel are iron alloys. They have 45% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is S31266 stainless steel and the bottom bar is SAE-AISI P21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 81
73
Tensile Strength: Ultimate (UTS), MPa 860
1130

Thermal Properties

Latent Heat of Fusion, J/g 310
250
Melting Completion (Liquidus), °C 1470
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 460
470
Thermal Conductivity, W/m-K 12
41
Thermal Expansion, µm/m-K 16
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
7.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
9.0

Otherwise Unclassified Properties

Base Metal Price, % relative 37
6.5
Density, g/cm3 8.2
7.9
Embodied Carbon, kg CO2/kg material 6.5
2.3
Embodied Energy, MJ/kg 89
32
Embodied Water, L/kg 220
62

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 29
40
Strength to Weight: Bending, points 24
31
Thermal Diffusivity, mm2/s 3.1
11
Thermal Shock Resistance, points 18
37

Alloy Composition

Carbon (C), % 0 to 0.030
0.18 to 0.22
Chromium (Cr), % 23 to 25
0 to 0.5
Cobalt (Co), % 0
1.1 to 1.3
Copper (Cu), % 1.0 to 2.5
0 to 0.25
Iron (Fe), % 34.1 to 46
92.1 to 94.2
Manganese (Mn), % 2.0 to 4.0
0.35 to 0.72
Molybdenum (Mo), % 5.2 to 6.2
0
Nickel (Ni), % 21 to 24
3.9 to 4.3
Nitrogen (N), % 0.35 to 0.6
0
Phosphorus (P), % 0 to 0.035
0 to 0.030
Silicon (Si), % 0 to 1.0
0.2 to 0.4
Sulfur (S), % 0 to 0.020
0 to 0.030
Tungsten (W), % 1.5 to 2.5
0
Vanadium (V), % 0
0.15 to 0.25