Description of Zr702 Plate
Zr702 Plate refers to a Zr702 alloy plate, which is known for its high mechanical strength and corrosion resistance, particularly in chloride seawater environments. The "702" refers to a specific grade of the alloy as per ASME and ISO standards. Zr702 Plate, or Zircaloy-702 as it is also called, is primarily used in the nuclear industry for the components that are within the core of a nuclear reactor due to the severe conditions of the reactor.
Zirconium 702 plate is a plate material rolled from industrial pure zirconium (UNSR60702, Zr+Hf≥99.2%) Fisher . It possesses extremely high corrosion resistance along with mechanical properties. This material becomes a crucial sctructure part in severe worlking conditions such chemical and nuclear power industry.
Features of Zr702 Plate
- Corrosion Resistance: Due to immersion of fuel rods in coolant water, Zr702 Plates possess high corrosion resistance, which makes them suitable for application in nuclear reactors.
- Strength: The alloy shows good strength, which maintains certain structural integrity and withstands pressure.
- Stability at High Temperatures: Some reactor designs strongly use materials, resistant to corrosion and can withstand high temperatures, which makes Zr702 Plate desirable.
- Thermal Conductivity: The plate's thermal conductivity enables Zr702 Plate to aid in effective heat transfer within the reactor.
- Radiation Resistance: Zr702 Plate is exposed to radiation in the nuclear environment, which raises concern for deflection; however, Zr702 plate shows good deflection resistance to this harmful exposure.
Applications of Zr702 Plate
Components of Nuclear Reactors: Zr702 Plate is used by the nuclear industry for the construction of subpressure vessels, fuel channels, and other complex components due to its metallurgical properties.
Also, due to its Zr702 Plate's thermal resistance and corrosion, it is used in high-temperature and high-pressure heat exchange vessels.
Zr702 Plate is useful for piping and vessels with aggressive corrosive fluids because of the high-strength corrosion-resistant materials used.
Specifications for Zr702 Plate
|
Item Name |
Zirconium Sheet / Zirconium plate |
|
Material |
R60702, R60704, R60705 |
|
Size |
0.3mm-50mm T x 100-1000mm W x 100-2000mm L |
|
Specification |
ASTM B551/551M-07 |
|
Surface |
Pickled, Sandblasted, Shiny |
Chemical composition for Zr702 Plate
|
Grade |
Zr+Hf |
Hf |
Fe+Cr |
Sn |
H |
N |
C |
O |
Nb |
|
R60702 |
99.2% |
<4.5% |
<0.20% |
– |
<0.005% |
<0.015% |
<0.030% |
<0.15% |
– |
|
R60704 |
97.5% |
<4.5% |
0.2-0.4% |
1.0-2.0% |
<0.005% |
<0.015% |
<0.030% |
<0.16% |
– |
|
R60705 |
95.5% |
<4.5% |
<0.2% |
– |
<0.005% |
<0.015% |
<0.050% |
<0.16% |
2.0-3.0% |
FAQ for Zr702 Plate
1. What are the properties of the zirconium 702 plate?
Composition: Zr+Hf≥99.2\% , Fe≤0.2\%
Density: 6.51 g/cm^3
Melting: 1852\degreeC
Thermal Conductivity: 22 W/(m·K)
Coefficient of thermal expansion: 5.8×10^{-6}/^{\circ}C (20 ≤ T < 100)
2. Why use zirconium 702 plate as opposed to other materials?
✅ Irreplaceable corrosion resistance.
Only one metal material that can sustain boiling hydrochloric acid for a long time.
Corrosion rate in 70\% Sulfuric acid → < 0.1 mm/year.
✅ Nuclear grade performance
Low value of thermal neutron absorption cross section: 0.18b.
Excellent radiation resistance.
✅ Cost-effectiveness
Although the initial cost is greater than that of stainless steel, the service life surpasses 10 times
3. In what fields is the Zirconium 702 plate mainly used?
🔹 Medical: Orthopedic surgical implants, surgical tools.
🔹 Marine: Deep-sea technologies and seawater desalting systems.
🔹 Chemical Industry: Pickling machinery, electrolyzers, and reactors.
🔹 Nuclear Power: Structural constituents of fuel assemblies and core support plates.
4. What issues must be dealt with concerning the works performed on Zirconium 702 plates?
⚠️ Important notes:
Welding: Must employ Tungsten Inert Gas (TIG) welding.
Argon must be of ≥99.999% purity.
Welds must undergo extensive clean-up processes post-weld.
Cleansers or cutting fluids that contain fluorine are not permitted.
Pressing: Requires preheating to 200-300 degrees Celsius.
Cutting: water jet or carbide tools are preferred.
5. Compare and contrast Zirconium 702 plates with Titanium plates.
Resistance against hydrochloric acid Zr702 plates possesses tolerance against boiling hydrochloric acid.
Strength: Zirconium 702 plates hold a higher tensile strength than the Titanium Grade 2 plate, which in neutral waters only resists weak acid <35 degrees Celsius and holds a tensile strength of 345 MPa.
6. Surface finishing methods of Zirconium 702 plate include:
Optional coatings, such as palladium plating, to enhance corrosion protection.
Electrolytic polishing for improved corrosion resistance.
Sandblasting increases adhesion to the surface.
Passive state:
reducing annealing (RA)
bright annealing (BA)
7. In what ways can we assess the adequacy of zirconium 702 plates?
🔍 Key indicators:
Material Mark /Grade: Zr + Hf ≥ 99.20%
Mechanical Properties: 380 MPa ≤ tensile strength, 20% ≤ elongation
Surface Imperfection: absence of cracks, folds, tenderness, etc.
Corrosive Resistance: referred to the ASTM G2 standard
8. Storage requirements of the zirconium 702 plate?
📦 Best practices:
Store in a dry environment (relative humidity <60%)
Avoid direct contact with carbon steel
It is recommended to wrap with anti-rust paper
Regular inspection of surface status is required for long-term storage
9. The available and known standard requirements – specifications of zirconium 702 plates are defined by:
Thickness: 0.5 mm up to 50 mm (most common 1mm/3mm/5mm/10mm)
Width: 500 mm to 1500 mm
Length: 1000 mm to 6000 mm
Upon the customer's request, ultra-thin (0.3 mm) and custom ultra-thick (>50 mm) plates are also available
10. Price factors of zirconium 702 plate?
💰 Main influencing factors:
Plate thickness (the thinner, the higher the unit price)
Dimensions (non-standard size premium)
Surface treatment requirements
Purchase quantity (bulk discount)
11. What is the delivery cycle of the zirconium 702 plate?
⏳ Normal situation:
Standard specifications: 4-8 weeks
Special specifications: 8-12 weeks
Expedited service: negotiable (extra cost required)
12. What are the key points of the zirconium 702 plate welding process?
⚡ Key parameters:
Shielding gas: high-purity argon (≥99.999%)
Welding wire: ERZr2 or ERZr3
Welding current: 20-30% lower than stainless steel
Post-weld treatment: Pickling must be performed to remove the oxide layer
13. What is the service life of the zirconium 702 plate?
⏳ Typical scenarios:
Chemical equipment: 15-20 years
Nuclear power plant: 4-6 years (depending on fuel consumption)
Medical implants: lifelong use
Marine environment: >30 years
Testing and RD
Packing
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