Present situation of application of hot rolled h-section steel in China
Use of hot-rolled h-section steel in China As China's economy continues to grow, national steel production increased year by year. Within this overall trend, steels for steel structures is the rise will be the maximum growth of China's iron and steel industry over the next few decades, its architectural style and high performance-cost ratio, comprehensive benefits, and so on, we can reflect the demands of the times. H has a broad, ever-increasing user base. According to statistics from China construction metal structure Association, national steel processing company now has more than 2000, with annual processing capacity of more than 20,000 t enterprises has more than 400 branches, most of these companies are the last 3-5 years growing up, and in 1998, less than 300 national Steel Corporation. H suppliers has been Foundation, deep, hot-rolled h-section steel promotional work. As towards government industry sex Guide file of issued, and modified hot h steel national standards, and developed hot h steel design manual, from regional, and industry two article line starts with, for h steel of user group----construction party, and design territories, and construction units,, has continuous number years for vigorously promotion, take Conference promotion, and engineering track, and door visit, way, to makes national h steel user group basically understand has hot h steel, user initial tentative using hot h steel Hou, received better economic and social benefits. Hot-rolled h-section steel abroad is one of main steel structure material, has a mature technology in China until 1998, but school textbooks of steel structures, steel structure design software, involved in making steel welded h-section steel, hot-rolled h-beam upon birth, by the industry's attention. As the hot rolling h section specification support in 4 years, mass production, with the design profession's awareness of this, along with the hot rolling h section price became identified by the investor, designer, with steel structure buildings, factories, bridges and other emerging, multiple hot-rolled h-beam production growth, contrary to the concrete buildings with reduced. 1. steel structure industrial building Steel structure building speed, low cost, convenience, and more "tall, light" and other advantages, and gradually occupied the industrial plant construction in this area. Multi-layer, heavy plant and heavy equipment support, device platforms, pipe rack support and other areas, such as the Yangtze ethylene project, Shanghai SMIC's multiple plant of Chongqing iron and steel to 300,000 t stainless steel project, maanshan iron and steel moved into engineering, involved and applied to other materials of hot-rolled h-section steel. 2. large urban public facilities Rapid urban construction, large office buildings and other landmarks of the city have sprung up, in the field of architecture, steel became synonymous with edgy and fashionable. Beijing China Millennium Monument, exhibition center, Xiamen, Chengdu shuangliu airport, theatre, Hangzhou, Changsha Convention and Exhibition Center, Guangzhou International Conference Exhibition Center, and application of hot rolled h-section steel industry attention and recognition.
3. civil buildings Includes residential, commercial office buildings, supermarkets and other buildings. Steel structure residential building system in its structural parts light design, high degree of prefabrication, easy to implement standardized, stereotyped, construction mechanization, Assembly production plant and short construction period as well as, in the building materials market showed a wide application and development prospect. Abroad, the steel used for steel structure housing accounted for a large proportion. In Japan, 1998 building reaches 8 million t of steel. In the United States, the proportion of the steel structure of the House from the early 90 's has grown to around 25% now 5%. China is basically empty, the difference is obvious. It is predicted that if developed countries per-capita steel consumption levels in China, consumption of h-beam steel structure and the House as a whole will reach 1 million t. To this end, the Ministry of construction after several years of promotion, decided to establish steel structure residence in around 2005 the corresponding norms, as well as supporting mature material system. 4. urban transport Urban transportation facilities, including subways, light rail and highway systems. Hot-rolled h-section steel play an increasing role in city construction, applied to the urban hub of steel truss bridges, light rail, Metro stations, maintenance garage, underground, and Foundation construction of temporary supports and foundations, Foundation pit engineering, show h-high scientific and technological content, short construction period, has a sound quality assurance system and so on. In Shenzhen, Guangzhou, Beijing, Nanjing and other cities, subways, railway stations, platforms, maintenance garage, power scaffolds and overpasses, pedestrian bridges, gas stations, billboards, etc, are of h-shape. Hot h steel has success application in Guangzhou Ya give sand bridge (beam contact beam used specifications 400x400H steel), and Wuhan shipyard contractors of Myanmar bridge of subject structure Shang (specifications for hot h steel 250x250, and 390x300, total dosage about more than 500 more tons, material for has must low temperature impact toughness requirements of Q345C steel), highway of overpass (double lane, 7 meters row frame of longitudinal, and beam, respectively using four support 600x200, and 500x200 composite transverse frames and stringers), upstream of the reservoir in Aksu in Xinjiang three-bridge truss structure, traffic in 2000 after making 200 combat bridge structure, trussed beams used hot-rolled h-section steel (specification 600x200) instead of the large beams. In addition, the construction of large bridges, docks platform, trestle currently has been hot-rolled h-section steel, Wuqiao, Qingdao ore terminal of the Qiantang River. Design and construction of deep Foundation pit of high-rise buildings, has always been an important subject in civil engineering industry. H (steel sheet piles) support system is very common in foreign countries, with the further development of urban building density, urban construction space is cramped, h-beam support system of deep Foundation pit will develop rapidly. In Metro based Ming dug construction in the, on used has specifications 700x300 of hot h steel (as Nanjing basaltic Lake tunnel, and Shenzhen Metro,, great play has this 700x300 steel has of resistance side to soil, and water pressure and caused of powerful of bent stress), this construction method, more concrete continuous wall price cheap 30%~40%, duration also fast near 1 time times, in national the big city based construction in the, are quickly get promotion.
5. mechanical processing Japan and application of hot rolled h-section steel in machined housing steel structure, as the two biggest application area. In our country, precisely these two areas is weak. Recently three years of practice proved, h steel in mechanical aspects completely is better than welding h steel; in oil lifting mechanical, and power boiler, and turbine, and power unit bracket, and metallurgical coke oven, and car, water process equipment platform, and power bracket, and large Lane, and overload car, and train flatbed, and shipbuilding, and large machine, aspects, h steel has price especially quality Shang of advantage, recently years annual 350,000 t dosage, future with application breadth and depth of changes, this aspects of using volume will gradually rose. The first half of 1999, h-section steel production plant in China developed JIS SM400B 512x202x12x22 specification h is used on railway flat car XN17A, Q345T600x200x11x17H steel XN17B flatbed, is now serving more than 20,000 tons, assembled in the country's more than 10,000 on multiple-beam flat cars. Meanwhile, large truck chassis, also in phase in the 500x200 series of hot-rolled h-section steel, full of hot-rolled h-shaped steel excellent fatigue resistance properties. 6. the shipbuilding industry In 2000, the steel hot rolling h-German Lloyd classification society quality certification. At present, domestic shipyards had used steel produces hot rolled h-cut t-shape steel ribs, deck supports fully reflects the weld material in its malleability, resistance to fatigue strength of the superiority of.
Source:http://www.jnsteelpipe.com/
