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SAE-AISI P20 Steel vs. S21800 Stainless Steel

Both SAE-AISI P20 steel and S21800 stainless steel are iron alloys. They have 65% 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 P20 steel and the bottom bar is S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
75
Tensile Strength: Ultimate (UTS), MPa 540 to 1050
740

Thermal Properties

Latent Heat of Fusion, J/g 260
340
Melting Completion (Liquidus), °C 1460
1360
Melting Onset (Solidus), °C 1420
1310
Specific Heat Capacity, J/kg-K 470
500
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
15
Density, g/cm3 7.8
7.5
Embodied Carbon, kg CO2/kg material 1.6
3.1
Embodied Energy, MJ/kg 21
45
Embodied Water, L/kg 52
150

Common Calculations

PREN (Pitting Resistance) 2.6
19
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
26
Strength to Weight: Axial, points 19 to 37
27
Strength to Weight: Bending, points 19 to 29
24
Thermal Shock Resistance, points 18 to 35
17

Alloy Composition

Carbon (C), % 0.28 to 0.4
0 to 0.1
Chromium (Cr), % 0.4 to 2.0
16 to 18
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 95.2 to 98.5
59.1 to 65.4
Manganese (Mn), % 0.35 to 0.71
7.0 to 9.0
Molybdenum (Mo), % 0.3 to 0.55
0
Nickel (Ni), % 0
8.0 to 9.0
Nitrogen (N), % 0
0.080 to 0.18
Phosphorus (P), % 0 to 0.030
0 to 0.060
Silicon (Si), % 0.2 to 0.8
3.5 to 4.5
Sulfur (S), % 0 to 0.030
0 to 0.030