Medium Diameter Straight Seam ERW Unit
1. ERW steel pipe has gradually gained market recognition due to its low cost and high efficiency, and its production equipment and production process technology have been rapidly developed. Nippon Steel, JFE, Manlesman, Kaulitz (Greece), Shiya (Korea) and other world-famous straight seam welded pipe production plants have been able to produce X80 steel grade line pipes for land or marine use. In terms of casing production in oil fields, Nippon Steel has been able to produce N80-I steel grade casings without heat treatment in full pipe according to API standards.
The 16" medium-diameter straight-seam ERW unit built by Nippon Steel Nagoya Steel Works in 1986 has been developed through years of technological development and equipment transformation, using various newly developed equipment technologies and proprietary technologies developed in the world. Tough material, Uniform properties, Free from defects (TUF) oil well pipe.
Because such welded oil well pipes have acid resistance, high strength, high toughness and high pressure collapse performance, they can be used in gas wells, deep wells and offshore oil fields with poor geological conditions, and the price is lower than that of seamless steel pipes, so it has broad application prospects.. Nippon Steel named this straight seam welded pipe T.U.F oil well pipe and formed an NT series different from the API product series: Nippon Steel T.U.F oil well pipe series (Nippon Steel T.U.F for OCTG). All performance indicators are higher than the API standard. The NT series products are the high-end products of oil well pipes in the world today, and are also unique products of Nippon Steel.
The welding forming line of the ERW610 unit of Baosteel Pipe Plant introduces the equipment technology developed by SMS-Meer and is equipped with the world's most advanced non-destructive testing equipment, high-frequency welding equipment and weld heat treatment equipment. After production, through the accumulation of process production technology and experience, and through scientific research and development, in the first half of 2006, it has mass-produced and supplied nearly 50,000 tons of pipeline pipes, casings and structural pipes, and in the API standard series N80, P110 casing. Make a breakthrough.
At present, it is developing and producing X80 steel grade pipelines (onshore and marine pipelines) and various types of TUF casings to fill the gap of China's straight seam welded pipe products, and will become a strong competitor of seamless steel pipes in the world steel pipe market.. 2. Development status of the world's medium diameter straight seam welded pipe technology2.1 Status of technology developmentThe development of welded steel pipe plant technology is accompanied by advances in competition with seamless steel pipe products. Welded steel pipes in many areas to replace seamless steel pipes, the key is the quality of the products and lower production costs. The improvement of the quality of welded steel pipe products mainly depends on three aspects of technological progress. The first is steel smelting technology, the second is the improvement of hot-rolled strip technology, and the third is the improvement of pipe-making technology.
Therefore, most of the world's high-quality welded steel pipes are produced by the most advanced large-scale steel joint ventures, which can easily control the quality of steel smelting, coiling and welded steel pipe production. Avoid the problem of eating "100 meals" and unable to control the quality of raw materials. Table 1. Comparison of the process and product steel grades of the world famous straight seam medium diameter welded steel pipe enterprises. 2.2 Technical characteristics of world-class medium-diameter straight seam welded pipe unitsa. Seamless steel pipe factory enterprises have consistent quality control. The quality of the hot rolled coil directly determines the performance indicators of the steel pipe body. Especially in the production of cutting-edge products, consistent quality management is one of the decisive roles.
An important reason why Nippon Steel can produce all kinds of welded steel pipes is that the company implements the "special alloy design" required for pipe production, and produces qualified steel billets through steel mills. The coils with high dimensional accuracy, acid resistance, high toughness and high pressure collapse performance are rolled through the hot rolling mill. These coils are then used to produce high quality line pipes and T.U.F oil well pipes. JFE Kawasaki Steel Works is also managed by quality, so the line pipe of Kawasaki Steel Works can provide strong support for pipe production from alloy composition design to quality control. Coupled with the development of its pipe-making technology, the quality and variety of the line pipe produced can meet the requirements of users. The raw material coils of the Manresmann Welded Pipe Plant have a single source of supply and are supplied by the Thyssen Hot Rolling Mill. Due to the long-term cooperative relationship, it is easier to control the quality of products from hot rolled coils at the source. Therefore, its production status is similar to JFE.