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SAE-AISI P20 Steel vs. S30415 Stainless Steel

Both SAE-AISI P20 steel and S30415 stainless steel are iron alloys. They have 72% of their average alloy composition in common. There are 24 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 P20 steel and the bottom bar is S30415 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
670

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Melting Completion (Liquidus), °C 1460
1410
Melting Onset (Solidus), °C 1420
1370
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 45
21
Thermal Expansion, µm/m-K 12
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.5
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
15
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.6
3.1
Embodied Energy, MJ/kg 21
43
Embodied Water, L/kg 52
140

Common Calculations

PREN (Pitting Resistance) 2.6
21
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19 to 37
24
Strength to Weight: Bending, points 19 to 29
22
Thermal Diffusivity, mm2/s 12
5.6
Thermal Shock Resistance, points 18 to 35
15

Alloy Composition

Carbon (C), % 0.28 to 0.4
0.040 to 0.060
Cerium (Ce), % 0
0.030 to 0.080
Chromium (Cr), % 0.4 to 2.0
18 to 19
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 95.2 to 98.5
67.8 to 71.8
Manganese (Mn), % 0.35 to 0.71
0 to 0.8
Molybdenum (Mo), % 0.3 to 0.55
0
Nickel (Ni), % 0
9.0 to 10
Nitrogen (N), % 0
0.12 to 0.18
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0.2 to 0.8
1.0 to 2.0
Sulfur (S), % 0 to 0.030
0 to 0.030