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Recently, the National Steel Standardization Technical Committee of GB / 20492-2006 "zinc -5% Aluminum - rare earth alloy coated steel wire strand," the national standard Publicizing and product seminar held in Tianjin. Meeting of the National Steel Standardization Technical Committee organized ring bell Tianjin Steel Co., Tianjin Liaoyuan Strand plant, Baosteel Group Shanghai-Steel Limited has undertaken.
Conference sent out an important message: China's power grid lines with a steel wire and strand need replacement. Promote the use of "Zinc -5% Aluminum - rare earth alloy coated steel wire strand" products to replace our galvanized steel wire for power lines, strand, for the conservation of resources and improve the overall economic benefits of great and far-reaching significance.
According to statistics, China's annual power line for about 30 million metric tons of steel, overhead ground wire (strand) used are more than 200,000 tons. As we all know, the atmosphere in the aluminum industry, wire design life of 30 years, the Eiffel Tower and other ancillary equipment after repair, maintenance, and can reach 30 years, but is currently used for galvanized steel wire (overhead ground wire) life span of only 10 years or so. Meanwhile, ACSR with galvanized steel wire is difficult to ensure that there is 30 years of life. Thus in the 30-year life of the wire, especially EHV Transmission Lines laid in the mountains, the distance, the condition is more severe, galvanized steel cable needs to be replaced more than twice. This will not only spend more, and the time required to replace the wires and the attendant waste of project impact and resource costs of astonishing. Therefore, how to improve the power grid lines with a steel wire and strand corrosion resistance and service life has become urgent need to resolve key issues.
The experts pointed out that seek efficient corrosion protection plating (coating) to withstand harsh natural environment and atmosphere engulfed the steel issue, is the world's industrial production hot spots need to be resolved. Eighties of the last century, the successful development of foreign Zn-5% Al- mixed rare earth alloy coating, causing great concern around the world. Zn-5% Al- mixed rare earth alloy coating (GALFAN®) patent belonging to International Lead and Zinc Organization (ILZRO) all, since 1983, Zn-5% Al- mixed rare earth alloy coated steel (including plate, wire, pipe) began formal commercial production. So far, Zn-5% Al- mixed rare earth alloy coating has been patented in over 30 countries around the world, there are 60 production lines around the world to buy a Zn-5% Al- mixed rare earth alloy coating (GALFAN®) from (ILZRO) production of patent license, the right to produce Zn-5% Al- mixed rare earth alloy coating (GALFAN®) plate, wire, pipe. Approximately 48% of the Zn-5% Al- world mixed rare earth alloy coating (GALFAN®) products manufactured in Japan, 42% in European production, 8% in North American producers. Most of Japan's electric power industry has been using the Zn-5% Al- mixed rare earth alloy coating products to replace the ordinary galvanized products.
Experts profoundly expounded, Zn-5% Al- performance superiority mixed rare earth alloy coating products mainly reflected in:
1. with high corrosion resistance, corrosion resistance of their products is about 2-3 times that of ordinary galvanized. Whether at home, in a humid environment, or in the marine climate and other harsh environments, the alloy coated steel wire corrosion resistance than ordinary galvanized, electro-galvanized location;
2. The alloy coated steel wire ductility and deformability is very strong, even beyond it protects the steel substrate. It can withstand strong deformation process conditions in winding, bending test, without having to worry coating cracking and falling;
3. The alloy coated steel wire and galvanized steel wire superior weldability;
4. The zinc alloy coated steel wire - aluminum structure provides a uniform surface with an excellent, compared to other coatings, its essence is an excellent alloy plating pretreatment substrate and adhesive applicator such excellent characteristics can improve the smear after cracking, corrosion and foaming.
Experts said that China from the late 1980s there were many manufacturers research and development, pilot production, thus recognizing and validating the Zn-5% Al- mixed rare earth alloy plating excellent overall performance. In practice, the manufacturers of production technology and equipment through a process of gradual improvement, product quality continues to improve. At the same time, the product market of galvanized circulation of various products, such as zinc and aluminum coated steel wire strand, aluminum and zinc coated steel wire strand rare earth, rare earth zinc-coated steel wire and strand, etc., using the identification and product performance standards are inconsistent. This brings a lot of inconvenience to the design units and users. Specification Zn-5% Al- mixed rare earth alloy coating product standards and production is imperative.
China issued the appropriate industry standards YB in the year 2000 / T179, YB / T180. With the development of national economy and market demand, China's further integration with the international economic and technological fields in urgent need to develop a new and higher level of national standards, ring the bell wire Tianjin Metallurgical Industry Co., Ltd. entrusted by the Information Standards Institute, Drafting "Zinc -5% Aluminum - rare earth alloy coated steel wire strand," the national standard. And in December 2004, he held a "zinc -5% Aluminum - rare earth alloy coated steel wire strand" in Tianjin national standard seminars; in June 2005 was held in Chengdu, "zinc -5% aluminum - mischmetal coated steel wire strand national standard "validation will be; in May 2006 submitted to the National Standardization Management Committee for approval; September 2006, the State Administration of Quality Supervision, Inspection and Quarantine, approved by the National Standardization Management Committee and published" Zinc -5% Aluminum - rare earth alloy coated steel wire strand, "the national standard, the standard number of GB / T20492-2006, and in 2007 the 2nd 1 officially implemented.
The experts stressed that the current zinc -5% Aluminum - rare earth alloy coated steel wire, steel wire products in China to promote the best time for a wide range of applications. One is with the national standards with international standards as the basis; the other is the product of production management, quality management, product management and after-sales service has accumulated more mature experience, saying about "decade sword," now The product is a "two decade sword"; the third is that the product has been applied in the project, and achieved good results; the fourth is good value. The production costs and the price is just higher than that of galvanized steel wire about 8%, compared with the aluminum-clad steel wire and strand, aluminum-clad steel price is only 60% -70%. Experts stressed that: the product due to the corrosion resistance, high overall economic efficiency, its market prospects will be very broad.