| |
|
|
| Details |
Current location: Home >> News >> Details |
|
|
| China's stainless steel pipes to be healthy development |
| |
With the rapid development of China's economic construction, stainless steel consumption continues to increase, the demand for stainless steel also is widening, and the market prospects. However, at present made of stainless steel tubes in variety, size, quantity, quality, etc. There is a gap with market demand. Varieties, made of stainless steel seamless pipe still eliminated 1Gr18Ni9Ti abroad mainly made of urea-class, high-precision stainless steel quality is also very difficult to guarantee; power station boiler heat exchanger tubes, pipes and so on urea fertilizer devices rely mainly on imports; with Good corrosion resistance of duplex stainless steel tube, very little domestic production. Product specifications, large-caliber, high demand for stainless steel pipe and long tubes, etc., the gap is relatively large; general-purpose small-caliber stainless steel production capacity greater than the market demand. The number of products, higher standards of industrial pipe, particularly in demanding industrial pipe is basically empty, ordinary stainless steel production and the overall market demand balance, common seamless pipe production capacity surplus, medium, low-level standard stainless steel decoration pipe oversupply.
Over the past decade, with the rapid expansion of application fields, the domestic right of different materials, different specifications, different varieties for different uses surge in demand for stainless steel pipe; with stainless steel pipes to attract high value-added, production of stainless steel pipe business from 80 years When more than a dozen to the current more than 400 integrated production and processing capacity of more than 1 million tons, the actual production from 1989 to 5 million tonnes in 1999 to 39 million tons; output reached 5,000 tons of standard business small, Most annual output of 1,000 tons of small factories. Of steel from a single austenite into martensite and the development of ferritic dual-phase steel, high alloy steel; product varieties, including seamless steel pipe cold trombone, cold pipe, hot-extruded tubes, centrifugal casting tubes, spin pressure pipe; welded pipes, including: plasma welding, argon arc welding, submerged arc, the speed of light and high-frequency welding, pipe welding, can produce stainless steel tube basically covers the countries of the world-standard varieties of specifications, stainless steel Rectangular pipe specification varieties also have reached more than 100 kinds of products used in industrial and civil and many other fields. Some developed countries in the world's total output of stainless steel welded stainless steel pipe output 65% ~ 75%. China stainless steel welded pipe capacity is incompatible with the domestic market demand, forecasting the 21st century, the domestic market demand for stainless steel welded pipes for at least year 6 million tons of imported products need to make up.
Mainly in the domestic stainless steel pipe production units and UOE forming a continuous method of production. Welding methods are based on the inert gas shielded arc welding, continuous molding unit, in the production of thin-walled steel tube process to configure a single gun in general welding, pipe wall thickness 2-3.2 mm tubes for industrial production welding gun are also 3-4, but also plus three gun shot plasma arc welding and other welding methods. As the high-energy plasma of deep penetration ability. In less than 6 mm wall thickness steel pipes, has been using the plasma welding, single-sided welding double-sided molding. UOE method is mainly produce large diameter, thick-walled stainless steel tube, commonly used argon arc welding, plasma welding 10. Now, the domestic industry can produce high-quality stainless steel welded pipe, steel pipe inside and outside surface of the bead smoothed. To weld and parent metal body has the same performance. In order to ensure the quality of industrial pipe, advanced seam tracking, weld Finishing and other advanced technologies have been adopted. At present, the domestic production of stainless steel pipe generally still use off-line processing method. Heat treatment for stainless steel heat treatment furnace Most gas-fired continuous roller hearth furnace, in addition to an electric heating continuous roller hearth furnace, three fuel continuous roller hearth furnace, two box-type furnace. At present, advanced on-line heat treatment has also been applied, the domestic production line has five straight in use. Muffle tube light treatment furnace, roller hearth bright protective atmosphere heat treatment furnace has also been used. At present, the domestic seamless steel tube tube, mainly in the steel Wu Chang, Taiyuan, Daye, Fushun, Xining, Nantong, Nova Scotia and other plants, there are some areas of production tube furnace charge back through the use of intermediate frequency furnace melting scrap. The domestic industry of steel pipe is the main origin of TISCO, Zhangjiagang Pohang, Ningbo Bao new, three on the steel plant, also using some imported raw material. Landscape architectural decoration materials imported raw materials as a thin strip, but also by the cold-rolled to produce hot-rolled narrow-band of raw materials, as well as intermediate frequency furnace production of slabs, produced by forging a narrow hot rolled band, cold-rolled and then the production of narrow-band . At present, the domestic production of stainless steel seamless pipe of varying quality.
The statistical analysis and probability analysis, in the last year of 7 million tons, the production, 25% can be reliably applications in petroleum, chemical, fertilizer, boiler and aerospace, nuclear power and other industries. Around 60% can be used in food, brewing, pharmaceutical, paper making, printing and dyeing, urban environmental protection and other industries. There are about 20% can be used for the nonconforming product or goods, the main problems is the chemical composition of steel beyond the allowable deviation; steel purity not containing impurities exceeded, resulting in unsatisfactory grain size; can not be produced by heat-treatment system, resulting in intergranular corrosion failure; inside and outside surface defects serious, heavy skin, clip residue, within the fold is not removed, serious side walls and so on. Industrial Welded Pipe and fewer defects; medium and large diameter pipe industry there is roundness and straightness of less than satisfactory; decorative pipe there is ultra-poor composition, diameter and the wall ultra-poor bear a serious problem.
At present, China's chemical fertilizer industry in the gap 30 million tons per year. It is learned that the relevant state departments plans to invest 5.0 billion, a new 10 sets of large-scale fertilizer plant. It is understood that only a 52-tons of urea and 30 tons of synthetic ammonia required for large-scale urea plant process piping, heat exchanger tubes, "Urea-class" special tubes, duplex stainless steel pipes and a variety of other steel Total 2018.5 tons . The development of petrochemical industry the demand for stainless steel is also a great, a polyolefin-phenol plant maintenance required to replace the stainless steel tube of 99.1 tons, of which Φ108-630mm large diameter seamless pipe stainless steel accounted for 53.79%. Expected that by 2005, demand for ethylene equivalent of about 15 million tons, five synthetic resin demand for 25 million ~ 27 million tons, acetic acid, vinyl acetate, maleic anhydride, ethylene oxide, phenol, acetone, phthalic anhydride and other 14 kinds of major organic raw material demand will reach 560 million tons. Beginning of this century, China's power generation capacity will reach 260 million -3.0 million kilowatts and 5 million kilowatts of nuclear power to be completed, under construction, five million kilowatts, and will gradually build 10 600,000 kilowatts of nuclear power stations. A 60 MW boiler pipe 455 tons of various specifications. Each block 600,000 kilowatts of nuclear power plants need to use the evaporator "U" shaped heat pipes 100 tons. In addition, there are a large number of pile elements stainless steel precision tubes and control rods, nuclear fuel packages casing and so on. Real needs of this century, a total of about a variety of more than 6000 tons of nuclear pipe. Long stainless steel tube in the boiler tubes, and so totally dependent on imports, such as, Φ16mm × 2.11-2.05mm, length 22-24m and Φ16mm × 1.2-3.0mm, length of 12.5-18.0m are the annual demand of 7,000 tons. The automotive industry demand for a lot of stainless steel pipes. It is estimated that only BUICK cars produced by Sino-US joint venture Shanghai Volkswagen's Santana and B5 luxury car five or six thousand tons of annual consumption of stainless steel pipes. Aviation and aerospace industry a need for precision stainless steel tube and high-temperature whole FSC 200 tons. Electronics, instrumentation, and metallurgical industries are required every year 5,000 tons of stainless steel pipes. Beverages, alcohol, food, textile, printing and dyeing and other light industry and medical pharmaceutical industry, for equipment manufacturing and maintenance, the annual consumption of more than 20,000 tons of stainless steel pipes. Stainless steel pipes and water equipment, is the world's most advanced infrastructure of water purification materials, water and gas in some cities such as fluid transport have also begun to use stainless steel pipe. Invested heavily in Wuhan, the widespread use of stainless steel piping and equipment, 13 water main water pipes and water tanks have been updated set of transformation, but also in the shortest possible time, in new high-rise residential and office space, the stainless steel piped water. Ningbo, Daqing and other places, some residents of the water supply pipes, stainless steel pipe has also started. Civilian area of the future will be a huge market for stainless steel tube.
The industry believes that the disorder in stainless steel industry development and competitiveness of the need to be taken seriously and norms, from production to sales of all enterprises should exercise self-discipline, so that China's stainless steel pipe manufacturing industry can be healthy and vigorous manner. |
|
|
|
|
