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R31538 Cobalt vs. EN 1.4123 Stainless Steel

R31538 cobalt belongs to the cobalt alloys classification, while EN 1.4123 stainless steel belongs to the iron alloys. There are 22 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is EN 1.4123 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
720 to 810

Thermal Properties

Latent Heat of Fusion, J/g 320
280
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
23
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.8

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.1
4.2
Embodied Energy, MJ/kg 110
62
Embodied Water, L/kg 530
120

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 34 to 45
26 to 29
Strength to Weight: Bending, points 27 to 32
23 to 25
Thermal Diffusivity, mm2/s 3.5
6.3
Thermal Shock Resistance, points 25 to 33
26 to 29

Alloy Composition

Carbon (C), % 0.15 to 0.35
0.35 to 0.5
Chromium (Cr), % 26 to 30
14 to 16.5
Cobalt (Co), % 58.7 to 68.9
0
Iron (Fe), % 0 to 0.75
76.7 to 84.6
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
1.0 to 2.5
Nickel (Ni), % 0 to 1.0
0 to 0.5
Nitrogen (N), % 0 to 0.25
0.1 to 0.3
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Vanadium (V), % 0
0 to 1.5

Comparable Variants