Problems to be solved in building large straight seam welded pipe units in China

1, choose the right process
From the comparison of several large longitudinal welded pipe technology and the development analysis of large longitudinal welded pipe technology in the world, UOE is the main DSAW tube unit in the world to produce high strength pipeline steel pipe. Its production capacity is large and the quality of the product is good.  The developed countries in the world have established such a unit. China is a big iron and steel country. It is also a country with a large number of oil and gas pipelines. It is very necessary to build 1 or 2 advanced UOE devices in the world to produce high quality steel pipes for oil and gas pipelines. In addition, 2 to 3 sets of other double tube units can be constructed, such as C pressure molding and continuous forming (CFE). Although the output of these welded pipe units is low, they have less investment, quick construction and good flexibility. Good quality and strong ability to adapt to the market. In order to adapt to the development of the pipeline industry in China, the pipeline will gradually be DSAW tube, and the spiral welded pipe market is gradually transformed into the straight welded pipe market.  This indicates that the construction of large longitudinal welded pipe will have a good prospect.


2, determine the reasonable industrial layout
The layout of the large longitudinal welded pipe production line should take into account the pipeline layout and future development plan. At present, the construction of large pipelines is mainly concentrated in the western and northern parts of China. At the same time, we should also consider the transportation of raw material steel plates for large longitudinal welded pipes, so as to solve the transportation problem of ultra long and wide steel plates. Therefore, there are two choices for the layout of the production line of the large straight welded pipe. First, the position of the large straight welded pipe production line is as close to the pipeline construction area as possible. It is beneficial to the transport cost of the steel pipe due to the empty rate of the railway transportation pipeline, the transportation cost is astonishing and the transportation cost from the pipe plant to the pipeline site is reduced. It is an important reason for reducing the cost of the project. Prime. The other is a large straight welded pipe production line near the steel production base or port, so it can solve the problem of long and ultra wide steel transportation and facilitate the transportation of steel. The construction of the large straight welded pipe production line in China has just started, and reasonable layout and planning should be carried out to make the industrial layout reasonable. It is of great significance to the construction of large straight welded pipe technology and pipeline construction in our country.


3, providing high quality steel for raw materials
The main raw material for the production of large straight welded pipe is to produce broad steel plate by steel plate mill (except for steel plate less than 600mm), which can be produced by hot rolling mill, and the high quality steel is required. Oil and gas pipelines have higher strength, toughness, weldability, anti H2S corrosion and other aspects. Generally, low carbon microalloy controlled rolling plates are used.  Therefore, the production of advanced smelting equipment (especially refining equipment) with perfect rolling control performance and the production of large flat rolling mill with X60 to X75 grade hot rolled wide steel plate and large straight seam welded pipe set as raw materials are required to produce pipeline pipes that meet the standard of API to meet the needs of pipeline construction and development.


4, digesting innovation and realizing the localization of equipment
The construction of large longitudinal welded pipe production line should be based on advanced technology, good product quality, less investment, good efficiency and strong competitiveness. In other words, we must adopt the latest technology and equipment in the world to reach the international advanced level so as to produce high quality pipelines that meet the API standard. At the same time, we should reduce investment and investment costs, improve economic efficiency and enhance the competitiveness of enterprises. But the large longitudinal welded pipe mill, especially the UOE unit, costs up to more than US $100 million, so reducing equipment costs is to reduce investment and investment costs. This problem can be made from most of the domestic equipment to design and manufacture important equipment abroad. In China, a collaborative design is made or adopted. It is mainly made in China. A small number of key equipment or components are introduced to achieve large longitudinal seam welding domestic technology assembly, domestic equipment and top equipment.