Welded steel pipes are categorized into various types based on their applications and manufacturing processes. These include general welded pipe, galvanized welded pipe, oxygen welding tube, metric system welded tube, transformer tube, welding thin wall pipe, and spiral welded pipe.
General Welded Pipe
General welded pipes are made from Q195A, Q215A, and Q235A mild steel. They are primarily used for transporting low-pressure fluids. These pipes undergo several tests, including water pressure, bending, and flattening tests, and must meet specific surface quality standards. They are typically delivered in lengths ranging from 4 to 10 meters. The specifications of welded pipes in nominal diameter often differ from the actual size. Depending on wall thickness, these pipes are classified as either common steel pipes or thickened steel pipes.
Galvanized Welded Pipe
To enhance corrosion resistance, general welded pipes are often galvanized with a protective zinc layer. There are two types of galvanized steel pipes:
Hot Dip Galvanized Pipe: Features a thick zinc layer, providing superior corrosion resistance.
Electro-Galvanized Pipe: Has a thinner zinc layer and is more cost-effective.
Metric System Welded Pipe
The metric system welded tube is made from common carbon steel, quality carbon steel, or low alloy steel, using hot and cold welding or hot welding followed by cold welding. The specifications follow the seamless steel pipe format, indicated as outside diameter * wall thickness (mm). These tubes are commonly used as structural elements such as axles or for fluid transport. Thin-walled tubes are used in the manufacture of furniture, lamps, and lanterns. Manufacturers must ensure the strength and bending resistance of the steel pipes during processing.
Spiral Welded Pipe
Spiral welded tubes are made from low carbon structural steel or low alloy structural steel strips, rolled into a tube billet at a specific helix angle (forming angle) and then welded at the joints. This method allows the use of narrow strip steel to produce large diameter steel pipes. Spiral welded tubes are widely used in oil and natural gas pipelines and come in single-side or double-sided welding variations.
Conclusion
Welded steel pipes are versatile and essential in various industries. Each type—whether general, galvanized, metric system, or spiral welded—has specific applications and advantages. Understanding these differences helps in selecting the appropriate pipe for a given purpose, ensuring efficiency, durability, and cost-effectiveness in their use.
United Steel Industry As the most important steel pipe manufacturer and exporter in China, in the past 20 years, we have completed more than 100 projects, with partners in more than 100 countries, and established relationships with oil and gas and EPC companies in many countries business relationship.
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