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Annealed R31537 Cobalt vs. Annealed SAE-AISI P4

Annealed R31537 cobalt belongs to the cobalt alloys classification, while annealed SAE-AISI P4 belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is annealed R31537 cobalt and the bottom bar is annealed SAE-AISI P4.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 23
21
Fatigue Strength, MPa 310
130
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 87
74
Tensile Strength: Ultimate (UTS), MPa 1000
390
Tensile Strength: Yield (Proof), MPa 590
190

Thermal Properties

Latent Heat of Fusion, J/g 320
260
Melting Completion (Liquidus), °C 1360
1460
Melting Onset (Solidus), °C 1290
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
41
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
8.1
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
9.3

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
1.8
Embodied Energy, MJ/kg 110
23
Embodied Water, L/kg 530
68

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
67
Resilience: Unit (Modulus of Resilience), kJ/m3 780
94
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 33
14
Strength to Weight: Bending, points 26
15
Thermal Diffusivity, mm2/s 3.4
11
Thermal Shock Resistance, points 24
13

Alloy Composition

Carbon (C), % 0 to 0.14
0 to 0.12
Chromium (Cr), % 26 to 30
4.0 to 5.3
Cobalt (Co), % 58.9 to 69
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 0.75
92.3 to 95.3
Manganese (Mn), % 0 to 1.0
0.2 to 0.6
Molybdenum (Mo), % 5.0 to 7.0
0.4 to 1.0
Nickel (Ni), % 0 to 1.0
0
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.0
0.1 to 0.4
Sulfur (S), % 0
0 to 0.030