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SAE-AISI A9 Steel vs. SAE-AISI P20 Steel

Both SAE-AISI A9 steel and SAE-AISI P20 steel are iron alloys. They have a moderately high 92% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI A9 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 74
73
Tensile Strength: Ultimate (UTS), MPa 770 to 2030
540 to 1050

Thermal Properties

Latent Heat of Fusion, J/g 280
260
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 35
45
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 9.2
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
2.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 4.7
1.6
Embodied Energy, MJ/kg 70
21
Embodied Water, L/kg 82
52

Common Calculations

PREN (Pitting Resistance) 10
2.6
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 28 to 73
19 to 37
Strength to Weight: Bending, points 24 to 46
19 to 29
Thermal Diffusivity, mm2/s 9.6
12
Thermal Shock Resistance, points 25 to 66
18 to 35

Alloy Composition

Carbon (C), % 0.45 to 0.55
0.28 to 0.4
Chromium (Cr), % 4.8 to 5.5
0.4 to 2.0
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 87 to 90.5
95.2 to 98.5
Manganese (Mn), % 0 to 0.5
0.35 to 0.71
Molybdenum (Mo), % 1.3 to 1.8
0.3 to 0.55
Nickel (Ni), % 1.3 to 1.8
0
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 1.0 to 1.2
0.2 to 0.8
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 0.8 to 1.4
0

Comparable Variants