Welded Steel Pipe Categories

Welded steel pipes are produced by bending steel strips or plates into circular, square, and other shapes and then welding them onto the exterior surface of the pipe seam. Common types of焊接 steel pipes include Double Submerged Arc Welding (DSAW), High Frequency Welding (ERW), and Spiral Submerged Arc Welding (SSAW). DSAW pipes are formed using molding machines, creating pipes with holes, and then焊接 using double-sided submerged arc welding. These pipes are produced using high-frequency skin effect currents on steel. Narrow spiral submerged arc焊接 steel pipes are made from roller-shaped steel pipes and utilize submerged arc welding, spiral welding, with longer longitudinal weld lengths, allowing for the production of large-diameter pipes in various sizes. Welded steel pipes, also known as welded tubes, are pipes made by rolling and welding steel plates or strips. The production process for焊接 steel pipes is simple, with high efficiency, a wide variety of sizes, and minimal equipment investment, although their general strength is typically lower than that of seamless steel pipes. Classification: Welded steel pipes are categorized by their welding processes into furnace焊接 pipes, electric焊接 (resistance welding) pipes, and automatic arc welding pipes. They are also divided into straight seam焊接 pipes and spiral焊接 pipes based on their welding methods. They are further categorized by their end shapes into round焊接 pipes and non-standard (square, flat, etc.)焊接 pipes. Welded pipes are also divided into several types based on their materials and uses: GB/T3091-1993 (Galvanized Welded Steel Pipes for Low-Pressure Fluid Transportation) is primarily used for transporting water, gas, air, oil, and heating hot water or steam at low pressure fluids and other purposes. The representative material is Q235A级 steel. GB/T3092-1993 (Galvanized Welded Steel Pipes for Low-Pressure Fluid Transportation) is also used for transporting water, gas, air, oil, and heating hot water or steam at low pressure fluids and other purposes. The representative material is Q235A级 steel. GB/T14291-1992 (Welded Steel Pipes for Mine Fluid Transportation) is primarily used for mine ventilation, drainage, and shaft gas discharge using straight seam焊接 pipes. The representative materials are Q235A and B-grade steel. GB/T14980-1994 (Large Diameter Electric Welded Steel Pipes for Low-Pressure Fluid Transportation) is primarily used for transporting water, sewage, gas, air, heating steam, and other low-pressure fluids and other purposes. The representative material is Q235A级 steel. GB/T12770-1991 (Welded Steel Pipes for Mechanical Structures) is primarily used in machinery, vehicles, bicycles, furniture, hotel and restaurant decorations, and other mechanical components. The representative materials are 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc. GB/T12771-1991 (Welded Steel Pipes for Fluid Transportation) is primarily used for transporting low-pressure corrosive media. The representative materials are 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2, etc. Decorative welding stainless steel pipes, stainless steel welding pipes for building decoration, large diameter electric welding pipes for low-pressure fluid transportation, and焊接 steel pipes for heat exchangers. Straight seam焊接 pipes have a simple production process, high production efficiency, low cost, and rapid development. Spiral焊接 pipes generally have higher strength than straight seam焊接 pipes, can produce larger diameter pipes using narrower billets, and can also produce pipes of different diameters using the same width billets. However, compared to straight seam pipes of the same length, the weld length increases by 30-100%, and production speed is slower. Therefore, smaller diameter焊接 pipes mostly use straight seam welding, while larger diameter pipes generally use spiral welding. Additional information: Welded pipes are made from strips, so they originally do not hold a position as high as seamless pipes.