PBT Crimped Bristles
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Welded steel pipe
Welded steel pipe, also known as a welded tube, is a type of steel pipe manufactured by rolling steel plates or strips and then welding them together. This kind of pipe is widely used due to its simple production process, high manufacturing efficiency, diverse specifications, and relatively low equipment investment. However, it generally has lower strength compared to seamless steel pipes. Since the 1930s, with the development of continuous rolling technology for high-quality steel strips and improvements in welding and inspection techniques, the quality of welded joints has significantly improved. As a result, the variety and size range of welded steel pipes have expanded, making them increasingly popular in many applications that previously relied on non-ferrous metals.
Welded steel pipes are typically categorized into two main types: straight seam welded pipes and spiral welded pipes, based on the shape of the weld. Straight seam welded pipes are known for their straightforward manufacturing process, high productivity, and cost-effectiveness, which has led to rapid development in this area. On the other hand, spiral welded pipes usually offer higher structural strength. However, because the length of the weld is increased by 30% to 100% compared to straight seam pipes of the same length, their production speed tends to be slower. Therefore, smaller diameter pipes often use straight seam welding, while larger diameter pipes are more commonly made using the spiral welding method.
Welded steel pipes designed for low-pressure fluid transportation (GB/T 3091-2008) are also referred to as general welded pipes, commonly known as black pipes. These pipes are used for conveying fluids such as water, gas, air, oil, and steam at low pressures. The wall thickness can be either standard or reinforced, and the pipe ends can be either threaded or smooth. In addition to direct use in fluid transport, these pipes are frequently used as raw materials for galvanized welded steel pipes.
Galvanized welded steel pipes for low-pressure fluid transportation (GB/T 3091-2008), also called galvanized electric welded pipes or white pipes, are hot-dip galvanized steel pipes used for similar purposes. They come in standard or thickened wall types and can have threaded or unthreaded ends. Their sizes are expressed in nominal diameters (in millimeters), which are approximate inner diameters, often converted to inches like 1/2, 3/4, 1, 2, etc.
Other specialized types include ordinary carbon steel wire conduits used in electrical installations, metric electric welded pipes, thin-walled electric welded pipes, pressurized fluid transportation pipes, and high-frequency welded pipes. These pipes are used in various industries, from construction to oil and gas transportation, offering strong pressure resistance, good weldability, and high efficiency in fluid transport. Spiral-welded steel pipes are particularly useful for large-scale infrastructure projects such as bridges, piers, and foundation piles. With strict testing and quality control, they ensure safe and reliable performance in demanding environments.