From the world's point of view, the past 15 years, the international industrial countries essentially no new seamless unit. In these countries, the proportion of steel pipe, seamless pipe about 30%, about 70% of pipe, welded pipe proportion is rising momentum. The number of products on our 2005 production was 15.67 million tons pipe, seamless pipe is 10.47 million tons, ranking first in the world; in product grade, high levels of seamless living, at the core, while living in the high-end pipe level, at the end edge of the core.
In OCTG, for example, continued to hold the leading position in seamless. Currently, the world production of ERW OCTG about 400 million tons, accounting for 50% of total oil casing. U.S. oil production process using ERW casing more than 50% of its total production, 76.8% of Japan's oil casing that can be used ERW pipe. At this stage, foreign ERW casing used, there has been a mature steel grade H40, J55, N89, L80, etc. In 2005, China produced about 1.8 million tons of oil well pipes, including seamless 1.62 million tons, accounting for 90%, ERW pipe 180,000 tons, accounting for 10%; and ERW pipe of steel grade is basically J55 level, great room for development .
As raw material production capacity greatly STRIP excess fierce market competition has become the impetus for innovation. High-speed broadband and domestic manufacturers are also in the pipeline, oil country tubular steel and weathering steel used in construction direction. Meanwhile, strip coil prices return to the rational, the current specifications of the same species ERW oil casing products cheaper than seamless pipe products about 800-1000 yuan per ton, profits also contributed to the spread of ERW pipe to the development of high-end products , which is bound to raise the level of technology of seamless pipes.
Seamless steel structure still dominated area, it is because the building is not only strength requirements tube, and has stiffness requirements. The advantage of having a thick-walled seamless pipe, can achieve stiffness requirements, round steel pipe To enter, they have to develop thick-walled tube. Currently, Φ114mmERW pipe wall thickness can reach the general 7mm. ERW welded pipe production rectangular tube wall thickness of less than 20mm in general, so the specifications for steel 400mm × 400mm-200mmx200mm-based, mostly as a steel rod.
In the field of boiler tubes, ERW pipe are seamless treatment process, still only restricted for low and medium pressure boiler tubes; seamless ranked high pressure boiler tube at this level, but would like the nuclear island tube, supercritical point ( such as pressure 24.2MPa, temperature 600 ℃) pipe direction. Pipe production process is "cold", and seamless production process is "thermal processing", pipe is more conducive to energy conservation and environmental protection. Hot-rolled seamless steel pipe production process 2-3 times to go through intermediate heating, a second piercing rolling, 1 and 1 finished blooming heat treatment, the process of energy consumption and environmental impact, as implemented Green metallurgical strategic objectives must address the issue. Therefore, to make seamless steel tube heat delivery technology, continuous casting round billet technology and even seamless shortened process technology research and development, independent innovation is an important issue. Only by doing so can we find significantly reduce the cost of production of seamless steel tubes, is also conducive to energy conservation and environmental protection, low-cost response to the challenges of pipe; Only by doing so can break a seamless technology with Chinese characteristics, the development of road.
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