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Zr702 Zirconium Bar Products Description
Zirconium 702 fasteners (ASTM B493), also known as UNS R60702, are reactive metals that have a high affinity for oxygen and form a protective oxide layer in air at room temperature. The oxide protective layer gives zirconium alloys universal corrosion resistance.
This oxide layer can be improved by heat treatment processes. A well-shaped, upgraded oxide layer serves as an excellent load-bearing surface, is resistant to a wide variety of materials, is highly resistant to decomposition in high-speed frames, and enhances corrosion resistance in certain corrosive environments.
When Astm B493 zirconium 702 fasteners are exposed to hydrochloric acid, the corrosion rate is less than 5 mpy. This low corrosion rate applies even when zirconium hexagon socket head cap screws are exposed to a wide range of concentrations of hydrochloric acid or HCl, and to a wide range of temperatures above the boiling point.
Zirconium 702 Alloy Bar
Zirconium 702 Round Bar Product Details
Thermal Properties Of ASTM B493 Zirconium 702 Fasteners:
| Thermal Properties | |||
| Heat of Fusion | 251 J/g | 108 BTU/lb | - |
| CTE, linear 20°C | 5.8 µm/m-°C | 3.22 µin/in-°F | over the range 20-100ºC |
| CTE, linear 250°C | 6.3 µm/m-°C | 3.5 µin/in-°F | - |
| CTE, linear 500°C | 6.9 µm/m-°C | 3.83 µin/in-°F | - |
| Heat Capacity | 0.285 J/g-°C | 0.0681 BTU/lb-°F | - |
| Thermal Conductivity | 16.7 W/m-K | 116 BTU-in/hr-ft²-°F | - |
| Melting Point | 1852 °C | 3370 °F | - |
Zirconium 702
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