R30605 Cobalt vs. EN 1.4305 Stainless Steel
R30605 cobalt belongs to the cobalt alloys classification, while EN 1.4305 stainless steel belongs to the iron alloys. They have a modest 30% 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 (8, in this case) are not shown.
For each property being compared, the top bar is R30605 cobalt and the bottom bar is EN 1.4305 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
Elastic (Young's, Tensile) Modulus, GPa | 210 | |
200 |
Elongation at Break, % | 34 | |
14 to 40 |
Fatigue Strength, MPa | 260 to 590 | |
190 to 330 |
Poisson's Ratio | 0.29 | |
0.28 |
Shear Modulus, GPa | 81 | |
77 |
Tensile Strength: Ultimate (UTS), MPa | 1130 to 1900 | |
610 to 900 |
Tensile Strength: Yield (Proof), MPa | 470 to 1600 | |
220 to 570 |
Thermal Properties
Latent Heat of Fusion, J/g | 290 | |
290 |
Melting Completion (Liquidus), °C | 1410 | |
1420 |
Melting Onset (Solidus), °C | 1330 | |
1380 |
Specific Heat Capacity, J/kg-K | 410 | |
480 |
Thermal Conductivity, W/m-K | 9.6 | |
15 |
Thermal Expansion, µm/m-K | 12 | |
16 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
2.4 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 1.8 | |
2.7 |
Otherwise Unclassified Properties
Density, g/cm3 | 9.6 | |
7.8 |
Embodied Carbon, kg CO2/kg material | 9.8 | |
3.0 |
Embodied Energy, MJ/kg | 140 | |
42 |
Embodied Water, L/kg | 450 | |
140 |
Common Calculations
Stiffness to Weight: Axial, points | 12 | |
14 |
Stiffness to Weight: Bending, points | 21 | |
25 |
Strength to Weight: Axial, points | 33 to 55 | |
22 to 32 |
Strength to Weight: Bending, points | 25 to 36 | |
20 to 27 |
Thermal Diffusivity, mm2/s | 2.5 | |
4.0 |
Thermal Shock Resistance, points | 31 to 52 | |
14 to 20 |
Alloy Composition
Carbon (C), % | 0.050 to 0.15 | |
0 to 0.1 |
Chromium (Cr), % | 19 to 21 | |
17 to 19 |
Cobalt (Co), % | 46.4 to 57 | |
0 |
Copper (Cu), % | 0 | |
0 to 1.0 |
Iron (Fe), % | 0 to 3.0 | |
66.4 to 74.9 |
Manganese (Mn), % | 1.0 to 2.0 | |
0 to 2.0 |
Nickel (Ni), % | 9.0 to 11 | |
8.0 to 10 |
Nitrogen (N), % | 0 | |
0 to 0.1 |
Phosphorus (P), % | 0 to 0.040 | |
0 to 0.045 |
Silicon (Si), % | 0 to 0.4 | |
0 to 1.0 |
Sulfur (S), % | 0 to 0.030 | |
0.15 to 0.35 |
Tungsten (W), % | 14 to 16 | |
0 |