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R31538 Cobalt vs. EN 1.7729 Steel

R31538 cobalt belongs to the cobalt alloys classification, while EN 1.7729 steel belongs to the iron alloys. There are 28 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 R31538 cobalt and the bottom bar is EN 1.7729 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 13 to 23
17
Fatigue Strength, MPa 310 to 480
500
Poisson's Ratio 0.29
0.29
Reduction in Area, % 13 to 22
56
Shear Modulus, GPa 86
73
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
910
Tensile Strength: Yield (Proof), MPa 580 to 930
750

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1360
1470
Melting Onset (Solidus), °C 1290
1430
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
40
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.7

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
3.3
Embodied Energy, MJ/kg 110
49
Embodied Water, L/kg 530
59

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
150
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
1500
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 34 to 45
32
Strength to Weight: Bending, points 27 to 32
27
Thermal Diffusivity, mm2/s 3.5
11
Thermal Shock Resistance, points 25 to 33
27

Alloy Composition

Aluminum (Al), % 0
0.015 to 0.080
Arsenic (As), % 0
0 to 0.020
Boron (B), % 0
0.0010 to 0.010
Carbon (C), % 0.15 to 0.35
0.17 to 0.23
Chromium (Cr), % 26 to 30
0.9 to 1.2
Cobalt (Co), % 58.7 to 68.9
0
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 0 to 0.75
94.8 to 97
Manganese (Mn), % 0 to 1.0
0.35 to 0.75
Molybdenum (Mo), % 5.0 to 7.0
0.9 to 1.1
Nickel (Ni), % 0 to 1.0
0 to 0.2
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0
0 to 0.015
Tin (Sn), % 0
0 to 0.020
Titanium (Ti), % 0
0.070 to 0.15
Vanadium (V), % 0
0.6 to 0.8