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R31538 Cobalt vs. EN 1.4418 Stainless Steel

R31538 cobalt belongs to the cobalt alloys classification, while EN 1.4418 stainless 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 1.4418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 23
16 to 20
Fatigue Strength, MPa 310 to 480
350 to 480
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
860 to 1000
Tensile Strength: Yield (Proof), MPa 580 to 930
540 to 790

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Melting Completion (Liquidus), °C 1360
1450
Melting Onset (Solidus), °C 1290
1400
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
15
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.5

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
2.8
Embodied Energy, MJ/kg 110
39
Embodied Water, L/kg 530
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
130 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
730 to 1590
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 34 to 45
31 to 36
Strength to Weight: Bending, points 27 to 32
26 to 28
Thermal Diffusivity, mm2/s 3.5
4.0
Thermal Shock Resistance, points 25 to 33
31 to 36

Alloy Composition

Carbon (C), % 0.15 to 0.35
0 to 0.060
Chromium (Cr), % 26 to 30
15 to 17
Cobalt (Co), % 58.7 to 68.9
0
Iron (Fe), % 0 to 0.75
73.2 to 80.2
Manganese (Mn), % 0 to 1.0
0 to 1.5
Molybdenum (Mo), % 5.0 to 7.0
0.8 to 1.5
Nickel (Ni), % 0 to 1.0
4.0 to 6.0
Nitrogen (N), % 0 to 0.25
0 to 0.020
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 0.7
Sulfur (S), % 0
0 to 0.015

Comparable Variants