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AISI 418 Stainless Steel vs. SAE-AISI P20 Steel

Both AISI 418 stainless steel and SAE-AISI P20 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 AISI 418 stainless steel and the bottom bar is SAE-AISI P20 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Tensile Strength: Ultimate (UTS), MPa 1100
540 to 1050

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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