ASTM A387 Grade 21L Class 1 vs. R30605 Cobalt
ASTM A387 grade 21L class 1 belongs to the iron alloys classification, while R30605 cobalt belongs to the cobalt alloys. There are 25 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 ASTM A387 grade 21L class 1 and the bottom bar is R30605 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
Elastic (Young's, Tensile) Modulus, GPa | 190 | |
210 |
Elongation at Break, % | 21 | |
34 |
Fatigue Strength, MPa | 160 | |
260 to 590 |
Poisson's Ratio | 0.29 | |
0.29 |
Shear Modulus, GPa | 74 | |
81 |
Tensile Strength: Ultimate (UTS), MPa | 500 | |
1130 to 1900 |
Tensile Strength: Yield (Proof), MPa | 230 | |
470 to 1600 |
Thermal Properties
Latent Heat of Fusion, J/g | 260 | |
290 |
Melting Completion (Liquidus), °C | 1470 | |
1410 |
Melting Onset (Solidus), °C | 1430 | |
1330 |
Specific Heat Capacity, J/kg-K | 470 | |
410 |
Thermal Conductivity, W/m-K | 41 | |
9.6 |
Thermal Expansion, µm/m-K | 13 | |
12 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 7.6 | |
2.0 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 8.8 | |
1.8 |
Otherwise Unclassified Properties
Density, g/cm3 | 7.9 | |
9.6 |
Embodied Carbon, kg CO2/kg material | 1.8 | |
9.8 |
Embodied Energy, MJ/kg | 23 | |
140 |
Embodied Water, L/kg | 62 | |
450 |
Common Calculations
Stiffness to Weight: Axial, points | 13 | |
12 |
Stiffness to Weight: Bending, points | 24 | |
21 |
Strength to Weight: Axial, points | 18 | |
33 to 55 |
Strength to Weight: Bending, points | 18 | |
25 to 36 |
Thermal Diffusivity, mm2/s | 11 | |
2.5 |
Thermal Shock Resistance, points | 14 | |
31 to 52 |
Alloy Composition
Carbon (C), % | 0 to 0.1 | |
0.050 to 0.15 |
Chromium (Cr), % | 2.8 to 3.3 | |
19 to 21 |
Cobalt (Co), % | 0 | |
46.4 to 57 |
Iron (Fe), % | 94.4 to 96.1 | |
0 to 3.0 |
Manganese (Mn), % | 0.3 to 0.6 | |
1.0 to 2.0 |
Molybdenum (Mo), % | 0.9 to 1.1 | |
0 |
Nickel (Ni), % | 0 | |
9.0 to 11 |
Phosphorus (P), % | 0 to 0.025 | |
0 to 0.040 |
Silicon (Si), % | 0 to 0.5 | |
0 to 0.4 |
Sulfur (S), % | 0 to 0.025 | |
0 to 0.030 |
Tungsten (W), % | 0 | |
14 to 16 |