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Annealed SAE-AISI 4620 vs. Annealed SAE-AISI P20

Both annealed SAE-AISI 4620 and annealed SAE-AISI P20 are iron alloys. Both are furnished in the annealed condition. They have a very high 98% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is annealed SAE-AISI 4620 and the bottom bar is annealed SAE-AISI P20.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
160
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 27
23
Fatigue Strength, MPa 260
210
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 320
340
Tensile Strength: Ultimate (UTS), MPa 490
540
Tensile Strength: Yield (Proof), MPa 350
290

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 47
45
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 3.2
2.8
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.6
1.6
Embodied Energy, MJ/kg 22
21
Embodied Water, L/kg 50
52

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
100
Resilience: Unit (Modulus of Resilience), kJ/m3 330
230
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 17
19
Strength to Weight: Bending, points 18
19
Thermal Diffusivity, mm2/s 13
12
Thermal Shock Resistance, points 15
18

Alloy Composition

Carbon (C), % 0.17 to 0.22
0.28 to 0.4
Chromium (Cr), % 0
0.4 to 2.0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 96.4 to 97.4
95.2 to 98.5
Manganese (Mn), % 0.45 to 0.65
0.35 to 0.71
Molybdenum (Mo), % 0.2 to 0.3
0.3 to 0.55
Nickel (Ni), % 1.7 to 2.0
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