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SAE-AISI P20 Steel vs. S31730 Stainless Steel

Both SAE-AISI P20 steel and S31730 stainless steel are iron alloys. They have 60% of their average alloy composition in common. There are 20 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI P20 steel and the bottom bar is S31730 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 540 to 1050
540

Thermal Properties

Latent Heat of Fusion, J/g 260
290
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1420
1390
Specific Heat Capacity, J/kg-K 470
470
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
24
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 1.6
4.6
Embodied Energy, MJ/kg 21
63
Embodied Water, L/kg 52
180

Common Calculations

PREN (Pitting Resistance) 2.6
30
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 19 to 37
19
Strength to Weight: Bending, points 19 to 29
18
Thermal Shock Resistance, points 18 to 35
12

Alloy Composition

Carbon (C), % 0.28 to 0.4
0 to 0.030
Chromium (Cr), % 0.4 to 2.0
17 to 19
Copper (Cu), % 0 to 0.25
4.0 to 5.0
Iron (Fe), % 95.2 to 98.5
52.4 to 61
Manganese (Mn), % 0.35 to 0.71
0 to 2.0
Molybdenum (Mo), % 0.3 to 0.55
3.0 to 4.0
Nickel (Ni), % 0
15 to 16.5
Nitrogen (N), % 0
0 to 0.045
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 0.010