R31538 Cobalt vs. EN 1.4371 Stainless Steel
R31538 cobalt belongs to the cobalt alloys classification, while EN 1.4371 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 1.4371 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
Elastic (Young's, Tensile) Modulus, GPa | 220 | |
200 |
Elongation at Break, % | 13 to 23 | |
45 to 51 |
Fatigue Strength, MPa | 310 to 480 | |
290 to 340 |
Poisson's Ratio | 0.29 | |
0.28 |
Shear Modulus, GPa | 86 | |
77 |
Tensile Strength: Ultimate (UTS), MPa | 1020 to 1360 | |
740 to 750 |
Tensile Strength: Yield (Proof), MPa | 580 to 930 | |
320 to 340 |
Thermal Properties
Latent Heat of Fusion, J/g | 320 | |
280 |
Melting Completion (Liquidus), °C | 1360 | |
1410 |
Melting Onset (Solidus), °C | 1290 | |
1370 |
Specific Heat Capacity, J/kg-K | 450 | |
480 |
Thermal Conductivity, W/m-K | 13 | |
15 |
Thermal Expansion, µm/m-K | 13 | |
17 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
2.5 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
2.9 |
Otherwise Unclassified Properties
Density, g/cm3 | 8.4 | |
7.7 |
Embodied Carbon, kg CO2/kg material | 8.1 | |
2.6 |
Embodied Energy, MJ/kg | 110 | |
38 |
Embodied Water, L/kg | 530 | |
140 |
Common Calculations
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 200 | |
270 to 310 |
Resilience: Unit (Modulus of Resilience), kJ/m3 | 750 to 1920 | |
250 to 300 |
Stiffness to Weight: Axial, points | 15 | |
14 |
Stiffness to Weight: Bending, points | 24 | |
25 |
Strength to Weight: Axial, points | 34 to 45 | |
27 |
Strength to Weight: Bending, points | 27 to 32 | |
24 |
Thermal Diffusivity, mm2/s | 3.5 | |
4.0 |
Thermal Shock Resistance, points | 25 to 33 | |
16 |
Alloy Composition
Carbon (C), % | 0.15 to 0.35 | |
0 to 0.030 |
Chromium (Cr), % | 26 to 30 | |
16 to 17.5 |
Cobalt (Co), % | 58.7 to 68.9 | |
0 |
Copper (Cu), % | 0 | |
0 to 1.0 |
Iron (Fe), % | 0 to 0.75 | |
66.7 to 74.4 |
Manganese (Mn), % | 0 to 1.0 | |
6.0 to 8.0 |
Molybdenum (Mo), % | 5.0 to 7.0 | |
0 |
Nickel (Ni), % | 0 to 1.0 | |
3.5 to 5.5 |
Nitrogen (N), % | 0 to 0.25 | |
0.15 to 0.25 |
Phosphorus (P), % | 0 | |
0 to 0.045 |
Silicon (Si), % | 0 to 1.0 | |
0 to 1.0 |
Sulfur (S), % | 0 | |
0 to 0.015 |