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Galvanized Steel Pipes
A galvanized steel pipe is a steel pipe that has been coated with a protective layer of zinc. This process, known as galvanization, is done to prevent the pipe from rusting and corroding. The zinc coating acts as a sacrificial layer, meaning it will corrode before the steel beneath it, extending the pipe’s lifespan.
BAOLAI manufactures two types of galvanized steel pipes: hot-dipped galvanized steel pipes and pre-galvanized steel pipes. Hot-dipped and pre-galvanized steel pipes are both coated with a layer of zinc to prevent corrosion, but their key difference lies in the timing of the galvanization process.
Galvanized Steel Pipe Products
Galvanized Steel Pipe Manufacturing Process
FAQs
1. What Is Galvanized Steel Pipe Used For?
▼Galvanized steel pipe is used for water distribution, fire protection, irrigation, fencing, scaffolding, handrails, outdoor structures, and general industrial piping. Its zinc coating helps protect the steel from corrosion in humid or exposed environments.
2. Is Hot-Dipped Galvanized the Same as Pre-Galvanized?
▼No. Hot-dip galvanized pipe is coated after the pipe has been formed, producing a thicker and more complete zinc layer. Pre-galvanized pipe is manufactured from steel sheet or coil that was coated before forming, so cut edges and welded areas may require additional protection.
3. What Are the Disadvantages of Hot-Dip Galvanizing?
▼Hot-dip galvanizing can increase initial cost and produce a less uniform surface than pre-galvanizing. The heat may distort thin components, while excess zinc can affect threads or small openings. Cutting or welding hot-dip galvanized pipe after coating also exposes bare steel that must be repaired.
4. What Is the ASTM for Galvanized Pipe?
▼ASTM A53/A53M is the most common standard for welded and seamless galvanized pipe used in mechanical and pressure applications. ASTM A795 applies to galvanized steel pipe for fire protection, while other structural products may follow different ASTM standards.
5. What Are Standard Galvanized Pipe Sizes?
▼ASTM A53 covers galvanized steel pipe sizes from NPS 1/8 to NPS 26. Commonly ordered sizes include NPS 1/2, 3/4, 1, 1 1/2, 2, 4, 6, and 8, with wall thicknesses such as Schedule 10, 40, and 80. Actual availability depends on the standard, manufacturer, and application.