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SAE-AISI 4815 Steel vs. SAE-AISI P20 Steel

Both SAE-AISI 4815 steel and SAE-AISI P20 steel are iron alloys. They have a very high 96% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4815 steel and the bottom bar is SAE-AISI P20 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 550
540 to 1050

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 52
45
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 6.6
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 7.6
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 4.3
2.8
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.8
1.6
Embodied Energy, MJ/kg 24
21
Embodied Water, L/kg 53
52

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 20
19 to 37
Strength to Weight: Bending, points 19
19 to 29
Thermal Diffusivity, mm2/s 14
12
Thermal Shock Resistance, points 18
18 to 35

Alloy Composition

Carbon (C), % 0.13 to 0.18
0.28 to 0.4
Chromium (Cr), % 0
0.4 to 2.0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 94.7 to 95.9
95.2 to 98.5
Manganese (Mn), % 0.4 to 0.6
0.35 to 0.71
Molybdenum (Mo), % 0.2 to 0.3
0.3 to 0.55
Nickel (Ni), % 3.3 to 3.8
0
Phosphorus (P), % 0 to 0.035
0 to 0.030
Silicon (Si), % 0.15 to 0.35
0.2 to 0.8
Sulfur (S), % 0 to 0.040
0 to 0.030