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R30605 Cobalt vs. EN 1.4658 Stainless Steel

R30605 cobalt belongs to the cobalt alloys classification, while EN 1.4658 stainless steel belongs to the iron alloys. They have a modest 31% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 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 R30605 cobalt and the bottom bar is EN 1.4658 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
210
Elongation at Break, % 34
28
Fatigue Strength, MPa 260 to 590
530
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 81
81
Tensile Strength: Ultimate (UTS), MPa 1130 to 1900
900
Tensile Strength: Yield (Proof), MPa 470 to 1600
730

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Melting Completion (Liquidus), °C 1410
1450
Melting Onset (Solidus), °C 1330
1400
Specific Heat Capacity, J/kg-K 410
470
Thermal Conductivity, W/m-K 9.6
16
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.8
Embodied Carbon, kg CO2/kg material 9.8
4.5
Embodied Energy, MJ/kg 140
61
Embodied Water, L/kg 450
200

Common Calculations

Stiffness to Weight: Axial, points 12
15
Stiffness to Weight: Bending, points 21
25
Strength to Weight: Axial, points 33 to 55
32
Strength to Weight: Bending, points 25 to 36
26
Thermal Diffusivity, mm2/s 2.5
4.3
Thermal Shock Resistance, points 31 to 52
24

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.030
Chromium (Cr), % 19 to 21
26 to 29
Cobalt (Co), % 46.4 to 57
0.5 to 2.0
Copper (Cu), % 0
0 to 1.0
Iron (Fe), % 0 to 3.0
50.9 to 63.7
Manganese (Mn), % 1.0 to 2.0
0 to 1.5
Molybdenum (Mo), % 0
4.0 to 5.0
Nickel (Ni), % 9.0 to 11
5.5 to 9.5
Nitrogen (N), % 0
0.3 to 0.5
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 0.4
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.010
Tungsten (W), % 14 to 16
0