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SAE-AISI P20 Steel vs. SAE-AISI 9255 Steel

Both SAE-AISI P20 steel and SAE-AISI 9255 steel are iron alloys. They have a very high 98% 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 P20 steel and the bottom bar is SAE-AISI 9255 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
72
Tensile Strength: Ultimate (UTS), MPa 540 to 1050
680

Thermal Properties

Latent Heat of Fusion, J/g 260
280
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1420
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 45
46
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.5
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
2.0
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.6
1.5
Embodied Energy, MJ/kg 21
20
Embodied Water, L/kg 52
46

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19 to 37
24
Strength to Weight: Bending, points 19 to 29
22
Thermal Diffusivity, mm2/s 12
13
Thermal Shock Resistance, points 18 to 35
21

Alloy Composition

Carbon (C), % 0.28 to 0.4
0.51 to 0.59
Chromium (Cr), % 0.4 to 2.0
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 95.2 to 98.5
96.2 to 97
Manganese (Mn), % 0.35 to 0.71
0.7 to 1.0
Molybdenum (Mo), % 0.3 to 0.55
0
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0.2 to 0.8
1.8 to 2.2
Sulfur (S), % 0 to 0.030
0 to 0.040