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SAE-AISI P4 Steel vs. SAE-AISI 8642 Steel

Both SAE-AISI P4 steel and SAE-AISI 8642 steel are iron alloys. They have a very high 95% 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 P4 steel and the bottom bar is SAE-AISI 8642 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 74
73
Tensile Strength: Ultimate (UTS), MPa 390 to 1980
580

Thermal Properties

Latent Heat of Fusion, J/g 260
250
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 41
39
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.1
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 9.3
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 4.4
2.6
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.8
1.5
Embodied Energy, MJ/kg 23
20
Embodied Water, L/kg 68
50

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 14 to 70
20
Strength to Weight: Bending, points 15 to 45
20
Thermal Diffusivity, mm2/s 11
10
Thermal Shock Resistance, points 13 to 64
17

Alloy Composition

Carbon (C), % 0 to 0.12
0.4 to 0.45
Chromium (Cr), % 4.0 to 5.3
0.4 to 0.6
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 92.3 to 95.3
96.6 to 97.8
Manganese (Mn), % 0.2 to 0.6
0.75 to 1.0
Molybdenum (Mo), % 0.4 to 1.0
0.15 to 0.25
Nickel (Ni), % 0
0.4 to 0.7
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0.1 to 0.4
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040