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R31538 Cobalt vs. EN 1.1221 Steel

R31538 cobalt belongs to the cobalt alloys classification, while EN 1.1221 steel 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 R31538 cobalt and the bottom bar is EN 1.1221 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 13 to 23
10 to 21
Fatigue Strength, MPa 310 to 480
240 to 340
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
72
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
730 to 870
Tensile Strength: Yield (Proof), MPa 580 to 930
390 to 550

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1360
1460
Melting Onset (Solidus), °C 1290
1410
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
48
Thermal Expansion, µm/m-K 13
12

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 8.1
1.5
Embodied Energy, MJ/kg 110
19
Embodied Water, L/kg 530
47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
67 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
410 to 800
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 34 to 45
26 to 31
Strength to Weight: Bending, points 27 to 32
23 to 26
Thermal Diffusivity, mm2/s 3.5
13
Thermal Shock Resistance, points 25 to 33
23 to 28

Alloy Composition

Carbon (C), % 0.15 to 0.35
0.57 to 0.65
Chromium (Cr), % 26 to 30
0 to 0.4
Cobalt (Co), % 58.7 to 68.9
0
Iron (Fe), % 0 to 0.75
97.1 to 98.8
Manganese (Mn), % 0 to 1.0
0.6 to 0.9
Molybdenum (Mo), % 5.0 to 7.0
0 to 0.1
Nickel (Ni), % 0 to 1.0
0 to 0.4
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0
0 to 0.035

Comparable Variants