Large-diameter straight-slit submerged arc pipes are mainly responsible for pipeline transportation of marine and onshore oil and gas, petroleum and natural gas, coal and mineral propellant and other media. They are especially suitable for the "West-East Gas Transmission" project currently under construction in my country, and can also be used for export and import. Germany's SMSMEER (formerly the internationally renowned Mannesmann) Company, Japan's NKK Company, Japan's 0.T.K (Osaka Special Steel Pipe Factory), India's WELSPVN Pipe Making Company, South Korea's Hyundai Heavy Industries and Seiya Company all have their own unique pipe making technologies , are all elites in the international pipe manufacturing industry.
International pipe making technology, process methods and characteristics
The forming methods for producing large-diameter straight seam submerged arc welded pipes abroad include: UOE method, CFE row forming method, RBE roll bending forming method, JCOE forming method, C forming method, PFP stepwise bending forming method, etc. A brief introduction is as follows:
1.The UOE method first presses the pre-bent steel plate into a U shape in the forming die of a U press, and then presses it into an O shape in the forming die of a 0 press and welds it into a pipe and then expands the overall diameter. The UOE method is one of the most advanced forming methods in the world. So far, there are nearly 30 sets of this forming welded pipe unit in the world. The UOE method is famous for its high production efficiency and good product quality, but it is not expensive and has a large investment scale.
2. The roller forming machine of the CFE method consists of a preforming frame, a flat roller frame, an edge bending roller and a small row of rollers. Since many identical small rows of rollers are installed, the trajectory of the edge of the steel plate during the forming process is almost Straight line, avoiding the "edge stretching" phenomenon. The CFE method has good forming quality, and its product quality is no different from that of the UOF method. This method uses hot rolled steel coils as raw materials, which is different from other forming methods. It is mainly suitable for the production of large batches and single varieties of steel pipes, but it is difficult to produce high-strength thick-walled steel pipes and large-diameter steel pipes.
3. The RBE roll bending forming method rolls the steel plate multiple times between three or four rollers. The welded pipe produced by this method is close to the UOE welded pipe in terms of performance and reliability. The RBE method has low investment, fast factory construction, moderate output, greater flexibility, and strong market adaptability. In recent years, this method has been applied in some developing countries. However, since this forming method has no support in the middle of the upper roller, and is limited by its stiffness, the diameter of the formed steel pipe cannot be less than 508mm (20in), which reduces the market share. The diameter of many pipes in my country is below 508mm.
5. The C forming method uses two C forming machines to replace the U press and 0 press in the UOE unit. The forming process is: the pre-bent steel plate is first formed into half of the steel plate on the first press, and then on the other The other half of the steel plate is formed on a press to obtain an O-shaped round tube. The welded pipe produced by the C forming method has suitable size, moderate output, and low production line price.
The continuous development of large-diameter straight seam submerged arc welded pipe manufacturing technology is of great significance for improving the quality, production efficiency and production safety of steel pipes. With the advancement of science and technology and the continuous innovation of processes, this manufacturing technology will become more mature and efficient.
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