ASTM B780 Alloy vs. S21800 Stainless Steel
ASTM B780 alloy belongs to the otherwise unclassified metals classification, while S21800 stainless steel belongs to the iron alloys. There are 15 material properties with values for both materials. Properties with values for just one material (18, in this case) are not shown.
For each property being compared, the top bar is ASTM B780 alloy and the bottom bar is S21800 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 83 | |
| 190 |
| Elongation at Break, % | 1.1 to 9.1 | |
| 40 |
| Poisson's Ratio | 0.36 | |
| 0.28 |
| Shear Modulus, GPa | 30 | |
| 75 |
| Shear Strength, MPa | 200 to 340 | |
| 510 |
| Tensile Strength: Ultimate (UTS), MPa | 330 to 590 | |
| 740 |
Thermal Properties
| Latent Heat of Fusion, J/g | 140 | |
| 340 |
| Specific Heat Capacity, J/kg-K | 270 | |
| 500 |
| Thermal Expansion, µm/m-K | 18 | |
| 16 |
Otherwise Unclassified Properties
| Density, g/cm3 | 10 | |
| 7.5 |
Common Calculations
| Stiffness to Weight: Axial, points | 4.5 | |
| 14 |
| Stiffness to Weight: Bending, points | 14 | |
| 26 |
| Strength to Weight: Axial, points | 9.1 to 16 | |
| 27 |
| Strength to Weight: Bending, points | 11 to 15 | |
| 24 |
| Thermal Shock Resistance, points | 16 to 29 | |
| 17 |
Alloy Composition
| Cadmium (Cd), % | 0 to 0.050 | |
| 0 |
| Carbon (C), % | 0 | |
| 0 to 0.1 |
| Chromium (Cr), % | 0 | |
| 16 to 18 |
| Copper (Cu), % | 23.5 to 25.7 | |
| 0 |
| Iron (Fe), % | 0 to 0.050 | |
| 59.1 to 65.4 |
| Lead (Pb), % | 0 to 0.030 | |
| 0 |
| Manganese (Mn), % | 0 | |
| 7.0 to 9.0 |
| Nickel (Ni), % | 0.35 to 0.65 | |
| 8.0 to 9.0 |
| Nitrogen (N), % | 0 | |
| 0.080 to 0.18 |
| Phosphorus (P), % | 0 | |
| 0 to 0.060 |
| Silicon (Si), % | 0 | |
| 3.5 to 4.5 |
| Silver (Ag), % | 74 to 76 | |
| 0 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Zinc (Zn), % | 0 to 0.060 | |
| 0 |