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SAE-AISI P20 Steel vs. AISI 418 Stainless Steel

Both SAE-AISI P20 steel and AISI 418 stainless steel are iron alloys. They have 83% 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 AISI 418 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
1100

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Melting Completion (Liquidus), °C 1460
1500
Melting Onset (Solidus), °C 1420
1460
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 45
25
Thermal Expansion, µm/m-K 12
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.5
3.1

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
15
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 1.6
2.9
Embodied Energy, MJ/kg 21
41
Embodied Water, L/kg 52
110

Common Calculations

PREN (Pitting Resistance) 2.6
19
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 19 to 37
38
Strength to Weight: Bending, points 19 to 29
29
Thermal Diffusivity, mm2/s 12
6.7
Thermal Shock Resistance, points 18 to 35
40

Alloy Composition

Carbon (C), % 0.28 to 0.4
0.15 to 0.2
Chromium (Cr), % 0.4 to 2.0
12 to 14
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 95.2 to 98.5
78.5 to 83.6
Manganese (Mn), % 0.35 to 0.71
0 to 0.5
Molybdenum (Mo), % 0.3 to 0.55
0 to 0.5
Nickel (Ni), % 0
1.8 to 2.2
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.8
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
2.5 to 3.5