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SAE-AISI P3 Steel vs. AISI 418 Stainless Steel

Both SAE-AISI P3 steel and AISI 418 stainless steel are iron alloys. They have 83% of their average alloy composition in common. There are 23 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 P3 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 410 to 1980
1100

Thermal Properties

Latent Heat of Fusion, J/g 250
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 46
25
Thermal Expansion, µm/m-K 12
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
3.1

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
15
Density, g/cm3 7.9
8.0
Embodied Carbon, kg CO2/kg material 1.5
2.9
Embodied Energy, MJ/kg 20
41
Embodied Water, L/kg 50
110

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 15 to 70
38
Strength to Weight: Bending, points 16 to 44
29
Thermal Diffusivity, mm2/s 12
6.7
Thermal Shock Resistance, points 14 to 65
40

Alloy Composition

Carbon (C), % 0 to 0.1
0.15 to 0.2
Chromium (Cr), % 0.4 to 0.75
12 to 14
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 96.3 to 98.4
78.5 to 83.6
Manganese (Mn), % 0.2 to 0.6
0 to 0.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 1.0 to 1.5
1.8 to 2.2
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.4
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
2.5 to 3.5