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R31538 Cobalt vs. EN 1.4658 Stainless Steel

R31538 cobalt belongs to the cobalt alloys classification, while EN 1.4658 stainless steel belongs to the iron alloys. They have a modest 35% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is EN 1.4658 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 13 to 23
28
Fatigue Strength, MPa 310 to 480
530
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 86
81
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
900
Tensile Strength: Yield (Proof), MPa 580 to 930
730

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1360
1450
Melting Onset (Solidus), °C 1290
1400
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
16
Thermal Expansion, µm/m-K 13
13

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
4.5
Embodied Energy, MJ/kg 110
61
Embodied Water, L/kg 530
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
240
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
1280
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 34 to 45
32
Strength to Weight: Bending, points 27 to 32
26
Thermal Diffusivity, mm2/s 3.5
4.3
Thermal Shock Resistance, points 25 to 33
24

Alloy Composition

Carbon (C), % 0.15 to 0.35
0 to 0.030
Chromium (Cr), % 26 to 30
26 to 29
Cobalt (Co), % 58.7 to 68.9
0.5 to 2.0
Copper (Cu), % 0
0 to 1.0
Iron (Fe), % 0 to 0.75
50.9 to 63.7
Manganese (Mn), % 0 to 1.0
0 to 1.5
Molybdenum (Mo), % 5.0 to 7.0
4.0 to 5.0
Nickel (Ni), % 0 to 1.0
5.5 to 9.5
Nitrogen (N), % 0 to 0.25
0.3 to 0.5
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0
0 to 0.010