ASTM B780 Alloy vs. Grade 21 Titanium
ASTM B780 alloy belongs to the otherwise unclassified metals classification, while grade 21 titanium belongs to the titanium alloys. There are 15 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown.
For each property being compared, the top bar is ASTM B780 alloy and the bottom bar is grade 21 titanium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 83 | |
| 140 |
| Elongation at Break, % | 1.1 to 9.1 | |
| 9.0 to 17 |
| Poisson's Ratio | 0.36 | |
| 0.32 |
| Shear Modulus, GPa | 30 | |
| 51 |
| Shear Strength, MPa | 200 to 340 | |
| 550 to 790 |
| Tensile Strength: Ultimate (UTS), MPa | 330 to 590 | |
| 890 to 1340 |
Thermal Properties
| Latent Heat of Fusion, J/g | 140 | |
| 410 |
| Specific Heat Capacity, J/kg-K | 270 | |
| 500 |
| Thermal Expansion, µm/m-K | 18 | |
| 7.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 10 | |
| 5.4 |
Common Calculations
| Stiffness to Weight: Axial, points | 4.5 | |
| 14 |
| Stiffness to Weight: Bending, points | 14 | |
| 32 |
| Strength to Weight: Axial, points | 9.1 to 16 | |
| 46 to 69 |
| Strength to Weight: Bending, points | 11 to 15 | |
| 38 to 50 |
| Thermal Shock Resistance, points | 16 to 29 | |
| 66 to 100 |
Alloy Composition
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| Aluminum (Al), % | 0 | |
| 2.5 to 3.5 |
| Cadmium (Cd), % | 0 to 0.050 | |
| 0 |
| Carbon (C), % | 0 | |
| 0 to 0.050 |
| Copper (Cu), % | 23.5 to 25.7 | |
| 0 |
| Hydrogen (H), % | 0 | |
| 0 to 0.015 |
| Iron (Fe), % | 0 to 0.050 | |
| 0 to 0.4 |
| Lead (Pb), % | 0 to 0.030 | |
| 0 |
| Molybdenum (Mo), % | 0 | |
| 14 to 16 |
| Nickel (Ni), % | 0.35 to 0.65 | |
| 0 |
| Niobium (Nb), % | 0 | |
| 2.2 to 3.2 |
| Nitrogen (N), % | 0 | |
| 0 to 0.030 |
| Oxygen (O), % | 0 | |
| 0 to 0.17 |
| Silicon (Si), % | 0 | |
| 0.15 to 0.25 |
| Silver (Ag), % | 74 to 76 | |
| 0 |
| Titanium (Ti), % | 0 | |
| 76 to 81.2 |
| Zinc (Zn), % | 0 to 0.060 | |
| 0 |
| Residuals, % | 0 | |
| 0 to 0.4 |