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SAE-AISI P20 Steel vs. S32550 Stainless Steel

Both SAE-AISI P20 steel and S32550 stainless steel are iron alloys. They have 65% of their average alloy composition in common. There are 24 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 SAE-AISI P20 steel and the bottom bar is S32550 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 73
80
Tensile Strength: Ultimate (UTS), MPa 540 to 1050
860

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 45
16
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.5
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
20
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.6
3.8
Embodied Energy, MJ/kg 21
53
Embodied Water, L/kg 52
180

Common Calculations

PREN (Pitting Resistance) 2.6
40
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19 to 37
31
Strength to Weight: Bending, points 19 to 29
26
Thermal Diffusivity, mm2/s 12
4.4
Thermal Shock Resistance, points 18 to 35
23

Alloy Composition

Carbon (C), % 0.28 to 0.4
0 to 0.040
Chromium (Cr), % 0.4 to 2.0
24 to 27
Copper (Cu), % 0 to 0.25
1.5 to 2.5
Iron (Fe), % 95.2 to 98.5
57.2 to 67
Manganese (Mn), % 0.35 to 0.71
0 to 1.5
Molybdenum (Mo), % 0.3 to 0.55
2.9 to 3.9
Nickel (Ni), % 0
4.5 to 6.5
Nitrogen (N), % 0
0.1 to 0.25
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.8
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030