We have recently completed the delivery of the second batch of seamless zirconium tubes for an industrial power plant maintenance project in South Korea. The customer placed a repeat order several months after the first delivery. This decision was based not only on the quality of the initial products but also on the professional technical support and reliable supply chain services provided. This batch of R60705 (Zr-2.5Nb) alloy tubes is designated for use in corrosion-resistant piping systems operating under high temperature and pressure within the power plant.

1. Project Background and Customer Requirements

The South Korean customer is a specialised maintenance service provider for industrial power plants. Pipes carrying highly corrosive media inside the plant are exposed to harsh conditions of high temperature and pressure. Consequently, the requirements for corrosion resistance and dimensional stability of the tube materials are extremely stringent.

Customer feedback after the first cooperation:

"The first batch of tubes performed perfectly during installation and operation, especially the non-destructive testing results. This directly led to the repeat order."

2. Product Specifications

This delivery strictly complies with the Chinese national standard GB/T 28283-2010, titled Seamless Zirconium and Zirconium Alloy Tubes, which applies to cold-rolled seamless tubes used in general industrial applications and heat exchangers.

The detailed specifications of this delivery are as follows:

Parameter	Value / Standard	Remarks
Product Name	Seamless Zirconium Tube	Manufactured by cold rolling
Applicable Standard	GB/T 28283-2010	Chinese National Standard
Material / Grade	R60705 (Zr-2.5Nb)	Zirconium-Niobium alloy, high strength
Dimension	Φ112.08 mm x 4.34 mm	Custom size
Length per Piece	6500.00 mm	Cut to length
Quantity	4 pieces	Repeat the order after the trial
Total Weight	263.00 kg	Actual net weight
Application	Industrial power plant maintenance	Replacement of aged, corroded pipelines

3. Key Properties and Inspection Reports

For R60705 zirconium tubes, all inspections were strictly performed according to the standard to ensure safety in the industrial power plant environment.

Chemical Composition (wt%)
Impurity elements such as Fe and O were strictly controlled to guarantee corrosion resistance. Key composition parameters are as follows:

Zirconium + Hafnium (Zr+Hf) : Remainder

Niobium (Nb): 2.0% – 2.8% (strengthening element)

Oxygen (O): ≤ 0.16%

Iron + Chromium (Fe+Cr) : ≤ 0.2%

Mechanical Properties
This batch demonstrated excellent mechanical performance with adequate strength and ductility:

Tensile Strength (Rm) : ≥ 480 MPa (actual values met the high requirement)

Yield Strength (Rp0.2) : ≥ 345 MPa

Elongation after fracture (A) : ≥ 16%

Quality Inspection
Each tube was subjected to rigorous inspection, accompanied by a bilingual (Chinese/English) mill test certificate:

Non-destructive testing (NDT): 100% ultrasonic testing passed (in accordance with GB/T 44760-2024).

Hydrostatic test: Each tube was hydrostatically tested with no leakage or deformation.

Surface and dimension check: Inner and outer surfaces were clean, free from cracks or folds. Dimensional tolerances met the agreed requirements.

4. Why the Customer Selected Our Company

Faced with the high standards of the South Korean customer, we ensured the success of this project through the following measures:

Standard alignment capability: Although the customer was familiar with ASTM standards, we demonstrated the equivalence and reliability of GB/T 28283-2010 (comparable to ASTM B523). Mutual recognition of standards was achieved, reducing communication effort.

Customised production: The required dimension Φ112.08 x 4.34 mm is not a standard stock size. By adjusting the cold rolling process, we met the customer's precise requirements for wall thickness tolerance.

Service details :

Packaging: Export-standard wooden cases with internal moisture-proof partitions suitable for sea freight.

Documentation: Bilingual mill test certificate, packing list, commercial invoice, and certificate of origin were provided, enabling smooth customs clearance.

5. Customer Testimonial

Mr Kim, Procurement Manager:
"This is our second purchase of zirconium tubes from this Chinese supplier. The first batch was tested by a KS-certified inspection agency in South Korea. The yield strength and ultrasonic test results fully met our industrial requirements. Delivery lead time was even shorter than expected. This is a reliable partner."

6. Conclusion and Contact Information

From a trial order of 263 kg to a stable repeat order, we have demonstrated that Chinese-made zirconium products not only comply with national standards but also meet the demands of international industrial markets.

If you are looking for seamless zirconium or titanium tubes in grades such as R60702 or R60705 (Zr-2.5Nb) and require strict compliance with GB/T 28283-2010 or ASTM B523, please contact us for the latest quotation and technical support. Email: linhui@lhtitanium.com