EN 1.7725 Steel vs. R31539 Cobalt
EN 1.7725 steel belongs to the iron alloys classification, while R31539 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is EN 1.7725 steel and the bottom bar is R31539 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
Elastic (Young's, Tensile) Modulus, GPa | 190 | |
220 |
Elongation at Break, % | 14 | |
13 to 22 |
Fatigue Strength, MPa | 390 to 550 | |
310 to 480 |
Poisson's Ratio | 0.29 | |
0.29 |
Shear Modulus, GPa | 73 | |
86 |
Tensile Strength: Ultimate (UTS), MPa | 830 to 1000 | |
1000 to 1340 |
Tensile Strength: Yield (Proof), MPa | 610 to 860 | |
590 to 940 |
Thermal Properties
Latent Heat of Fusion, J/g | 250 | |
320 |
Melting Completion (Liquidus), °C | 1460 | |
1360 |
Melting Onset (Solidus), °C | 1420 | |
1290 |
Specific Heat Capacity, J/kg-K | 470 | |
450 |
Thermal Conductivity, W/m-K | 39 | |
13 |
Thermal Expansion, µm/m-K | 13 | |
13 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 7.4 | |
2.0 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 8.6 | |
2.1 |
Otherwise Unclassified Properties
Density, g/cm3 | 7.8 | |
8.4 |
Embodied Carbon, kg CO2/kg material | 1.8 | |
8.2 |
Embodied Energy, MJ/kg | 24 | |
110 |
Embodied Water, L/kg | 54 | |
530 |
Common Calculations
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 to 130 | |
140 to 190 |
Resilience: Unit (Modulus of Resilience), kJ/m3 | 980 to 1940 | |
780 to 2000 |
Stiffness to Weight: Axial, points | 13 | |
15 |
Stiffness to Weight: Bending, points | 24 | |
24 |
Strength to Weight: Axial, points | 29 to 35 | |
33 to 44 |
Strength to Weight: Bending, points | 25 to 28 | |
27 to 32 |
Thermal Diffusivity, mm2/s | 11 | |
3.5 |
Thermal Shock Resistance, points | 24 to 29 | |
24 to 32 |
Alloy Composition
Aluminum (Al), % | 0 | |
0.3 to 1.0 |
Carbon (C), % | 0.27 to 0.34 | |
0 to 0.14 |
Chromium (Cr), % | 1.3 to 1.7 | |
26 to 30 |
Cobalt (Co), % | 0 | |
57.7 to 68.7 |
Iron (Fe), % | 95.7 to 97.5 | |
0 to 0.75 |
Lanthanum (La), % | 0 | |
0.030 to 0.2 |
Manganese (Mn), % | 0.6 to 1.0 | |
0 to 1.0 |
Molybdenum (Mo), % | 0.3 to 0.5 | |
5.0 to 7.0 |
Nickel (Ni), % | 0 | |
0 to 1.0 |
Nitrogen (N), % | 0 | |
0 to 0.25 |
Phosphorus (P), % | 0 to 0.025 | |
0 |
Silicon (Si), % | 0 to 0.6 | |
0 to 1.0 |
Sulfur (S), % | 0 to 0.030 | |
0 |
Vanadium (V), % | 0.050 to 0.15 | |
0 |