R60705 Zirconium Wire Description
Product Introduction
R60705 zirconium alloy wire (UNS R60705 / Zr-2.5Nb) is an α+β zirconium alloy with 2.0–3.0% niobium content. Niobium addition provides higher strength and improved corrosion resistance compared to unalloyed zirconium (R60702). The material exhibits exceptional corrosion resistance in hydrochloric acid, sulfuric acid, nitric acid, and organic acids, outperforming titanium alloys and stainless steels. R60705 is widely used in chemical heat exchangers, reactors, nuclear reactor structural components, and medical devices. Available from φ0.1 mm to φ6.5 mm, customizable up to φ10.0 mm, as straight wire or coil.
Technical Specifications
1. Basic Information
Product Name | R60705 Zirconium Alloy Wire |
Grade Equivalents | UNS R60705/Zr-2.5Nb |
Standards | ASTM B550, ASTM B551, GB/T 8769 |
Supply Forms | Straight wire, Coil wire |
Surface Conditions | Pickled, Bright finish |
Diameter Range | φ0.1-φ6.5 mm; customizable up to φ10.0 mm |
Straightness | ≤2/1000 |
2. Chemical Compositions
Zr+Hf | Nb | Fe+Cr | Hf | O | C | N | H |
≥95.5% | 2.0-3.0% | ≤0.20% | ≤4.5% | ≤0.18% | ≤0.05% | ≤0.025% | ≤0.005% |
3. Mechanical Properties
Tempers | UTS (MPa) | YS (MPa) | Elongations (%) |
Annealed (M) | ≥552 | ≥379 | ≥16 |
4. Physical Properties
Properties | Values |
Density | 6.55 g/cm³ |
Melting Point | ≈1845°C |
Coefficient of Thermal Expansion | 5.9×10⁻⁶/°C |
Thermal Conductivity | ≈12 W/(m·K) |
Electrical Resistivity | ≈0.42 μΩ·m |
Magnetic Properties | Non-magnetic (paramagnetic) |
Max. Service Temperature | ≤350°C |
Features and Advantages
- Exceptional acid resistance: Virtually immune to corrosion in HCl, H₂SO₄, HNO₃, and most organic acids-outperforms titanium alloys.
- Higher strength than pure zirconium: Nb addition raises UTS to ≥552 MPa while retaining good ductility.
- Nuclea-grade hydrothermal resistance: Extremely low corrosion rate in high-temperature, high-pressure water.
- Low thrmal neutron cross-section: Core advantage of zirconium alloys, essential for nuclear reactor structural components.
- Good biocompatibility: Non-toxic and non-sensitizing; zirconium alloys are increasingly used in dental and orthopedic implants.
- Lightweight with corrosion resistance: Density 6.55 g/cm³; combined corrosion resistance and weight savings deliver significant lifecycle cost advantage.
Performance Solutions
A. Problem: Stainless steel corrodes rapidly in HCl and H₂SO₄, resulting in extremely short equipment life.
Solution: R60705 zirconium alloy is virtually immune to corrosion in HCl and H₂SO₄. Equipment service life extends by orders of magnitude.
B. Problem: Titanium alloys suffer crevice corrosion and hydrogen embrittlement in hot, concentrated acid media, limiting their application range.
Solution: R60705 zirconium alloy remains stable in hot, concentrated acids. Its corrosion window is far wider than titanium alloys.
C. Problem: Nickel-based alloys undergo selective corrosion in fluorine-containing media and oxidizing acids, driving up maintenance costs.
Solution: R60705 zirconium alloy resists a broad range of oxidizing acids and fluorine-containing media. Lifecycle maintenance costs are extremely low.
D. Problem: Carbon steel and iron-based alloys cannot function in strong acid chemical environments, creating difficult material-selection challenges.
Solution: R60705 zirconium alloy performs well across the full pH 0-14 range, solving the material-selection problem for extreme acid service.
Applications
A. Used in heat exchanger tube bundles, condensers, and evaporators for HCl, H₂SO₄, and HNO₃ service. Extremely low corrosion rates in hot strong acids with equipment life orders of magnitude longer than stainless steel.
B. Used in reactor linings,agitators,seals, and high-pressure vessel components. Full pH-range corrosion resistance for the most aggressive acid service conditions.
C. Used in fuel cladding tubes,pressure tubes, spacer grids,and core structural components. Low thermal neutron cross-section with minimal corrosion in high-temperature, high-pressure water.
D. Used in dental implants, orthopedic fixation devices, and surgical instruments. Non-magnetic, non-toxic, MRI-compatible, and biocompatible.
E. Used in bolts,nuts,gaskets,and fittings for strong acid service.Excellent corrosion resistance with low maintenance costs. Safe and reliable.