Description of Zirconium 705 Tube / Zirconium Alloy Pipe
Zirconium 705 tube is a high-performance zirconium–niobium alloy pipe known for its exceptional corrosion resistance, high melting point, superior mechanical strength, and excellent stability in extreme environments. As a rare metal material, Zirconium 705 is widely used in demanding industries such as aerospace, nuclear energy, chemical processing, and marine engineering.
Zirconium alloys exhibit a melting point of approximately 1800°C, compared to ~1600°C for titanium, while zirconium dioxide reaches an impressive 2700°C. These properties make Zirconium 705 tubes ideal for applications involving high temperatures, aggressive chemicals, and long-term structural reliability.
Zirconium 705 seamless pipes are commonly used in heat exchangers, condensers, pressure vessels, and nuclear fuel cladding, due to their superior resistance to corrosion, especially against strong acids and alkalis. Their excellent biocompatibility also allows their use in medical and dental applications.
Technical Specifications
1. Grades
ZR60702
ZR60705
2. Standards
ASTM B658
GB/T 26283
3. Dimensions
Outer Diameter (OD): 6.0–108 mm
Wall Thickness: 1.0–4.5 mm
Length: 2000–6000 mm
4. Straightness
≤ 3 mm per meter
Testing & Requirements
6. Flaring Test
Zr-1 zirconium tubes for heat exchangers must undergo a flaring test using a 60° tapered tool. After a 15% inner diameter expansion, the sample must show no cracking at the end.
7. Ultrasonic Testing
All tubes must be inspected by ultrasonic flaw detection. Acceptance criteria for standard U-shaped defects must comply with GB/T 12969.1.
8. Metallographic Structure
Recrystallised and annealed ZR1 tubes must have an average grain size no coarser than Grade 7, as specified in GB/T 6394-2002.
Chemical Composition (wt%)
| Element |
R60702 |
R60704 |
R60705 |
| Zr + Hf, min |
99.2 |
97.5 |
95.5 |
| Hafnium, max |
4.5 |
4.5 |
4.5 |
| Fe + Cr |
0.2 max |
0.2–0.4 |
0.2 max |
| Tin |
— |
1.0–2.0 |
— |
| Hydrogen, max |
0.005 |
0.005 |
0.005 |
| Nitrogen, max |
0.025 |
0.025 |
0.025 |
| Carbon, max |
0.05 |
0.05 |
0.05 |
| Niobium |
— |
— |
2.0–3.0 |
| Oxygen, max |
0.16 |
0.18 |
0.18 |
Mechanical Properties
| Property |
R60702 |
R60704 |
R60705 |
| Tensile Strength, min (MPa) |
380 |
415 |
550 |
| Yield Strength, min (MPa) |
205 |
240 |
380 |
| Elongation (50 mm or 2 in), min (%) |
16 |
14 |
16 |
Applications of Zirconium 705 Tube
Zirconium 705 alloy pipes are widely used in industries requiring extreme corrosion resistance, high purity, and durability, including:
Industrial Applications
Nuclear power systems
Chemical processing plants
Heat exchangers and condensers
Pressure vessels and reactor components
Piping systems transporting highly corrosive chemicals
Salt production and seawater equipment
High-Tech Applications
Aerospace and aviation components
Marine engineering
Electronics manufacturing
Medical & Biotech
Medical implants
Dental components
Surgical equipment
Key Performance Advantages
Outstanding corrosion and erosion resistance
Non-magnetic and non-sparking
High temperature resistance
Long service life and reliability
Excellent structural stability
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