Annealed ASTM B780 Alloy vs. Annealed S21904 Stainless Steel
Annealed ASTM B780 alloy belongs to the otherwise unclassified metals classification, while annealed S21904 stainless steel belongs to the iron alloys. There are 18 material properties with values for both materials. Properties with values for just one material (17, in this case) are not shown.
For each property being compared, the top bar is annealed ASTM B780 alloy and the bottom bar is annealed S21904 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 83 | |
| 200 |
| Elongation at Break, % | 9.1 | |
| 51 |
| Poisson's Ratio | 0.36 | |
| 0.28 |
| Shear Modulus, GPa | 30 | |
| 78 |
| Shear Strength, MPa | 200 | |
| 510 |
| Tensile Strength: Ultimate (UTS), MPa | 330 | |
| 700 |
Thermal Properties
| Latent Heat of Fusion, J/g | 140 | |
| 290 |
| Melting Completion (Liquidus), °C | 860 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 270 | |
| 480 |
| Thermal Expansion, µm/m-K | 18 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 76 | |
| 2.5 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 68 | |
| 2.9 |
Otherwise Unclassified Properties
| Density, g/cm3 | 10 | |
| 7.7 |
Common Calculations
| Stiffness to Weight: Axial, points | 4.5 | |
| 14 |
| Stiffness to Weight: Bending, points | 14 | |
| 25 |
| Strength to Weight: Axial, points | 9.1 | |
| 25 |
| Strength to Weight: Bending, points | 11 | |
| 23 |
| Thermal Shock Resistance, points | 16 | |
| 15 |
Alloy Composition
| Cadmium (Cd), % | 0 to 0.050 | |
| 0 |
| Carbon (C), % | 0 | |
| 0 to 0.040 |
| Chromium (Cr), % | 0 | |
| 19 to 21.5 |
| Copper (Cu), % | 23.5 to 25.7 | |
| 0 |
| Iron (Fe), % | 0 to 0.050 | |
| 59.5 to 67.4 |
| Lead (Pb), % | 0 to 0.030 | |
| 0 |
| Manganese (Mn), % | 0 | |
| 8.0 to 10 |
| Nickel (Ni), % | 0.35 to 0.65 | |
| 5.5 to 7.5 |
| Nitrogen (N), % | 0 | |
| 0.15 to 0.4 |
| Phosphorus (P), % | 0 | |
| 0 to 0.045 |
| Silicon (Si), % | 0 | |
| 0 to 1.0 |
| Silver (Ag), % | 74 to 76 | |
| 0 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Zinc (Zn), % | 0 to 0.060 | |
| 0 |