AWS BAu-5 vs. ASTM A227 Spring Steel
AWS BAu-5 belongs to the otherwise unclassified metals classification, while ASTM A227 spring steel belongs to the iron 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 AWS BAu-5 and the bottom bar is ASTM A227 spring steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 140 | |
| 190 |
| Poisson's Ratio | 0.37 | |
| 0.29 |
| Shear Modulus, GPa | 50 | |
| 72 |
| Tensile Strength: Ultimate (UTS), MPa | 210 | |
| 1720 to 2220 |
Thermal Properties
| Latent Heat of Fusion, J/g | 180 | |
| 250 |
| Melting Completion (Liquidus), °C | 1170 | |
| 1450 |
| Melting Onset (Solidus), °C | 1140 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 280 | |
| 470 |
| Thermal Expansion, µm/m-K | 12 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 13 | |
| 7.8 |
Common Calculations
| Stiffness to Weight: Axial, points | 5.8 | |
| 13 |
| Stiffness to Weight: Bending, points | 13 | |
| 24 |
| Strength to Weight: Axial, points | 4.5 | |
| 61 to 79 |
| Strength to Weight: Bending, points | 6.0 | |
| 41 to 48 |
| Thermal Shock Resistance, points | 9.0 | |
| 55 to 71 |
Alloy Composition
| Carbon (C), % | 0 | |
| 0.45 to 0.85 |
| Gold (Au), % | 29.5 to 30.5 | |
| 0 |
| Iron (Fe), % | 0 | |
| 97.4 to 99.1 |
| Manganese (Mn), % | 0 | |
| 0.3 to 1.3 |
| Nickel (Ni), % | 35.5 to 36.4 | |
| 0 |
| Palladium (Pd), % | 33.5 to 34.5 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 | |
| 0 to 0.050 |
| Residuals, % | 0 to 0.15 | |
| 0 |