R31538 Cobalt vs. SAE-AISI 1025 Steel
R31538 cobalt belongs to the cobalt alloys classification, while SAE-AISI 1025 steel belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is R31538 cobalt and the bottom bar is SAE-AISI 1025 steel.
Metric UnitsUS Customary Units
Mechanical Properties
Elastic (Young's, Tensile) Modulus, GPa | 220 | |
190 |
Elongation at Break, % | 13 to 23 | |
17 to 28 |
Fatigue Strength, MPa | 310 to 480 | |
190 to 280 |
Poisson's Ratio | 0.29 | |
0.29 |
Reduction in Area, % | 13 to 22 | |
45 to 57 |
Shear Modulus, GPa | 86 | |
73 |
Tensile Strength: Ultimate (UTS), MPa | 1020 to 1360 | |
450 to 500 |
Tensile Strength: Yield (Proof), MPa | 580 to 930 | |
250 to 420 |
Thermal Properties
Latent Heat of Fusion, J/g | 320 | |
250 |
Melting Completion (Liquidus), °C | 1360 | |
1460 |
Melting Onset (Solidus), °C | 1290 | |
1420 |
Specific Heat Capacity, J/kg-K | 450 | |
470 |
Thermal Conductivity, W/m-K | 13 | |
52 |
Thermal Expansion, µm/m-K | 13 | |
12 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
6.9 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
8.0 |
Otherwise Unclassified Properties
Density, g/cm3 | 8.4 | |
7.9 |
Embodied Carbon, kg CO2/kg material | 8.1 | |
1.4 |
Embodied Energy, MJ/kg | 110 | |
18 |
Embodied Water, L/kg | 530 | |
45 |
Common Calculations
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 200 | |
80 to 110 |
Resilience: Unit (Modulus of Resilience), kJ/m3 | 750 to 1920 | |
170 to 470 |
Stiffness to Weight: Axial, points | 15 | |
13 |
Stiffness to Weight: Bending, points | 24 | |
24 |
Strength to Weight: Axial, points | 34 to 45 | |
16 to 18 |
Strength to Weight: Bending, points | 27 to 32 | |
17 to 18 |
Thermal Diffusivity, mm2/s | 3.5 | |
14 |
Thermal Shock Resistance, points | 25 to 33 | |
14 to 16 |
Alloy Composition
Carbon (C), % | 0.15 to 0.35 | |
0.22 to 0.28 |
Chromium (Cr), % | 26 to 30 | |
0 |
Cobalt (Co), % | 58.7 to 68.9 | |
0 |
Iron (Fe), % | 0 to 0.75 | |
99.03 to 99.48 |
Manganese (Mn), % | 0 to 1.0 | |
0.3 to 0.6 |
Molybdenum (Mo), % | 5.0 to 7.0 | |
0 |
Nickel (Ni), % | 0 to 1.0 | |
0 |
Nitrogen (N), % | 0 to 0.25 | |
0 |
Phosphorus (P), % | 0 | |
0 to 0.040 |
Silicon (Si), % | 0 to 1.0 | |
0 |
Sulfur (S), % | 0 | |
0 to 0.050 |