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R31538 Cobalt vs. EN 1.7386 Steel

R31538 cobalt belongs to the cobalt alloys classification, while EN 1.7386 steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is EN 1.7386 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 13 to 23
18 to 21
Fatigue Strength, MPa 310 to 480
170 to 290
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
75
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
550 to 670
Tensile Strength: Yield (Proof), MPa 580 to 930
240 to 440

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1360
1450
Melting Onset (Solidus), °C 1290
1410
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
26
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
9.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
10

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
2.0
Embodied Energy, MJ/kg 110
28
Embodied Water, L/kg 530
88

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
92 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
150 to 490
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 34 to 45
20 to 24
Strength to Weight: Bending, points 27 to 32
19 to 22
Thermal Diffusivity, mm2/s 3.5
6.9
Thermal Shock Resistance, points 25 to 33
15 to 18

Alloy Composition

Aluminum (Al), % 0
0 to 0.040
Carbon (C), % 0.15 to 0.35
0.080 to 0.15
Chromium (Cr), % 26 to 30
8.0 to 10
Cobalt (Co), % 58.7 to 68.9
0
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 0 to 0.75
86.8 to 90.5
Manganese (Mn), % 0 to 1.0
0.3 to 0.6
Molybdenum (Mo), % 5.0 to 7.0
0.9 to 1.1
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
0.25 to 1.0
Sulfur (S), % 0
0 to 0.010

Comparable Variants