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R31539 Cobalt vs. ASTM A387 Grade 12 Steel

R31539 cobalt belongs to the cobalt alloys classification, while ASTM A387 grade 12 steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is ASTM A387 grade 12 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 13 to 22
25
Fatigue Strength, MPa 310 to 480
190 to 230
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
73
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
470 to 520
Tensile Strength: Yield (Proof), MPa 590 to 940
260 to 310

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1360
1470
Melting Onset (Solidus), °C 1290
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
44
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.3

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.2
1.6
Embodied Energy, MJ/kg 110
21
Embodied Water, L/kg 530
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
98 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
180 to 250
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 33 to 44
16 to 18
Strength to Weight: Bending, points 27 to 32
17 to 18
Thermal Diffusivity, mm2/s 3.5
12
Thermal Shock Resistance, points 24 to 32
14 to 15

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0.050 to 0.17
Chromium (Cr), % 26 to 30
0.8 to 1.2
Cobalt (Co), % 57.7 to 68.7
0
Iron (Fe), % 0 to 0.75
97 to 98.2
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
0.4 to 0.65
Molybdenum (Mo), % 5.0 to 7.0
0.45 to 0.6
Nickel (Ni), % 0 to 1.0
0
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 1.0
0.15 to 0.4
Sulfur (S), % 0
0 to 0.025

Comparable Variants