Galvanized Steel Pipes

• Long-Term Corrosion Protection & High Durability: The thick zinc coating provides excellent sacrificial protection, granting the pipes a lifespan of several decades in humid or mildly corrosive environments, significantly reducing maintenance and replacement costs.

• Reliable Structural Integrity: Retains the high strength and load-bearing capacity of carbon steel. The coating comprehensively covers both internal and external surfaces, ensuring structural reliability in critical applications like plumbing, fire systems, and structural supports.

• Cost-Effectiveness & Immediate Installation: While the initial cost may be slightly higher, the exceptional longevity and lack of need for on-site painting result in massive long-term savings and faster project installation times.

• Broad Application Versatility: Available in a wide range of specifications and standards, suitable for municipal infrastructure, HVAC systems, agricultural irrigation, and industrial fluid transport, making it an extremely versatile piping solution.

Our galvanized steel pipes are produced using a continuous hot-dip galvanizing process to ensure strong coating adhesion and long-lasting corrosion protection.

1. Surface Preparation (Pickling & Cleaning)
   The base steel pipes (ERW or seamless) are immersed in an acid solution (HCl or H₂SO₄) to remove mill scale, rust, and impurities, ensuring a clean surface for coating.

2. Rinsing & Fluxing
   After cleaning, the pipes are rinsed and treated with a flux solution (ZnCl₂–NH₄Cl) to prevent oxidation before galvanizing and improve coating bonding.

3. Hot-Dip Galvanizing
   Pipes are immersed in molten zinc at approximately 450°C, forming a metallurgical zinc-iron alloy layer that provides both barrier and sacrificial protection.

4. Coating Thickness Control
   Excess zinc is removed using air knives, ensuring uniform coating thickness (e.g., Z100–Z500) according to international standards.

5. Cooling & Passivation
   The pipes are cooled and may undergo passivation treatment to enhance corrosion resistance and prevent white rust.

6. Inspection & Testing
   Final products are tested for coating thickness, adhesion, and uniformity through methods such as copper sulfate testing and mechanical impact testing.

   
   

This advanced process ensures excellent corrosion resistance, strong coating adhesion, and consistent product quality.

• Building Water Supply and Drainage Systems: Indoor and outdoor cold water transmission pipes, fire sprinkler systems.

• Gas Transmission: Low-pressure natural gas and coal gas inlet pipes for buildings.

• Outdoor Facilities: Street light poles, traffic sign poles, guardrails, fences, greenhouse frames.

• Power & Telecommunications: Conduits for cable threading, telecommunication tower structures.

Our galvanizing process strictly adheres to ASTM A123 and A53 standards. We conduct rigorous tests on coating thickness, uniformity, and adhesion (e.g., copper sulfate test, hammer test). Products are ISO9001 certified, and galvanizing quality certificates are provided.

We offer various processing services before and after galvanizing:

• Cut-to-length

• Threading (with galvanized protector coupling)

Products are bundled and packaged, wrapped with anti-rust paper and plastic film, and secured with sturdy wooden cradles, suitable for land and sea transportation. We work with professional and reliable logistics partners to ensure the products arrive safely at your designated port of destination. Shipments are available from major ports like Shanghai, Tianjin, delivering globally.