UNS R60702 Zirconium Alloy Round Bar
- Outstanding corrosion resistance in hydrochloric, sulfuric, nitric, and organic acids
- Good corrosion resistance in strong alkalis and high-temperature water
- Low neutron absorption cross-section — ideal for nuclear applications
- Density 6.51 g/cm³, melting point 1852°C
- Tensile strength ≥380 MPa, yield strength ≥205 MPa, elongation ≥16%
- Excellent formability, weldability, and machinability
- Diameters from 6mm to 150mm, custom sizes available
- Surface finishes: pickled, machined, polished
Description Of UNS R60702 Zirconium Alloy Round Bar
UNS R60702 Zirconium Alloy Round Bar is a solid round bar manufactured from unalloyed zirconium designated as UNS R60702 (also known as Zr702). It is produced through vacuum arc remelting (VAR), forging, hot rolling, cold finishing, and precision machining. R60702 is commercially pure zirconium with controlled hafnium content and excellent corrosion resistance, making it one of the most widely used zirconium grades in chemical processing and nuclear applications.
Zirconium 702 offers outstanding resistance to hydrochloric acid, sulfuric acid, nitric acid, acetic acid, and many organic acids. It is immune to stress corrosion cracking (SCC) and highly resistant to pitting and crevice corrosion. Its low thermal neutron absorption cross-section makes it indispensable in nuclear reactor components. The material also has good formability and weldability, allowing it to be machined, bent, and welded into complex components.
UNS R60702 zirconium alloy round bars are available in diameters from 6mm to 150mm, with custom sizes upon request. Surface finishes include pickled, machined, and polished. The material complies with ASTM B550 / ASME SB-550, the standard specification for zirconium and zirconium alloy bar and wire. Typical applications include heat exchangers, condensers, reaction vessels, piping, pumps, valves, and nuclear reactor structural components.
Features Of UNS R60702 Zirconium Alloy Round Bar
High Purity: UNS R60702 with Zr + Hf ≥ 99.2%, ensuring consistent performance in critical applications.
Excellent Corrosion Resistance: Resists hydrochloric acid, sulfuric acid, nitric acid, acetic acid, and strong alkalis. Immune to stress corrosion cracking.
Low Neutron Absorption: Low thermal neutron absorption cross-section for nuclear applications.
Good Formability: Can be machined, bent, and welded into complex shapes.
Good Weldability: Can be welded using TIG and electron beam welding in inert gas atmospheres.
High Melting Point: 1852°C for high-temperature applications.
Low Density: 6.51 g/cm³, lighter than steel and many refractory metals.
Low Thermal Expansion: Ensures dimensional stability under thermal cycling.
Customizable Dimensions: Diameters 6–150mm, custom lengths and surface finishes available.
Standard Compliance: ASTM B550 / ASME SB-550.
ISO 9001 Certified: Full traceability and quality assurance.
Applications Of UNS R60702 Zirconium Alloy Round Bar
Chemical Processing: Heat exchangers, condensers, reaction vessels, columns, piping, pumps, and valves handling hydrochloric acid, sulfuric acid, nitric acid, acetic acid, and other corrosive media.
Nuclear Industry: Structural components, fuel cladding supports, and reactor internals where low neutron absorption and high-temperature corrosion resistance are critical.
Urea and Fertilizer Production: Heat exchangers and piping in urea, acetic acid, formic acid, and nitric acid production.
Petrochemical Industry: Equipment exposed to strong acids and corrosive environments.
Medical Gas Pipeline Systems: Components requiring high purity and corrosion resistance.
Marine and Offshore: Seawater-cooled equipment and desalination plant components.
Aerospace: Lightweight structural components and high-temperature applications.
Research and Development: Laboratory crucibles, sample holders, and experimental components.
Specifications Of UNS R60702 Zirconium Alloy Round Bar
| Parameter | Specification |
|---|---|
| Material | Unalloyed zirconium |
| UNS Designation | R60702 (Zr702) |
| Chemical Composition (nominal) | Zr + Hf ≥ 99.2%; Hf ≤ 4.5%; Fe + Cr ≤ 0.20%; H ≤ 0.005%; N ≤ 0.025%; C ≤ 0.05%; O ≤ 0.16% |
| Density | 6.51 g/cm³ |
| Melting Point | 1852°C |
| Thermal Conductivity | ~22 W/(m·°C) |
| Elastic Modulus | 99.3 GPa |
| Tensile Strength | ≥380 MPa |
| Yield Strength (0.2% offset) | ≥205 MPa |
| Elongation | ≥16% |
| Diameter Range | 6 – 150 mm (customizable) |
| Length | Customizable |
| Surface Finish | Pickled, machined, polished |