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Industry News

In recent years, the rapid development of steel areas

Source: Time:2016-01-19 08:53:34 frequency:

At present, China is undergoing a massive capital construction, many large and complex steel works, including the 2008 Olympic venue construction projects are underway. Select Advanced and reasonable structure system, both to meet the architectural needs, but also to achieve technologically advanced, economical and reasonable, safe application, to ensure the quality is very important. Currently there is a pursuit of architectural style novelty, weird, but at the most bulky waste steel structure

With the continuous development and progress of human society, in the economy and in science and technology, in steel we have also made a lot of new developments.

 First, new developments in steel steel
  Abroad made in the application of high-performance steel many new progress, including high-strength steel high-performance, low yield point steel and the development and application of fire-resistant steel and so on.

  China's new steel design specification revision added the excellent performance of the Q420 steel, the steel (15MnVN) has been successfully applied in the construction of Jiujiang Yangtze River Bridge in. Also China's metallurgical sector to develop the industry standard YB4104-2000 "high-rise building structure with steel," which is designed for high-rise steel buildings and other important buildings (structures) for the production of thick plate welding section beam.

  Its performance is similar to the Japanese building structure with steel, but also on the quality improved. Some of our companies are pilot production yield point 15 reaches 100N / mm2 * 1 The low yield point steel, the equivalent of Japan's LY100 steel, can be used for energy component seismic structure. Some companies are developing fire-resistant steel, the steel even when heated to 6000C can be maintained at room temperature for more than two-thirds strength.

  Japan enacted a new special steel structures spec "building structural rolled steel (JSG3136) SN Standards" in 1994. Quality level is no longer the kind of steel by Charpy (Charpy) impact test classification, but by the use of the site, tips on need to be classified. As SN400A (equivalent to our Q235A) can only be used in the secondary members in the elastic range, in principle, non-welded components or parts; SN400B and SN490B (close to the strength of Q345 grade) is to ensure that the plastic deformation and welding properties steel used in structural components and parts in the earthquake; SN400C and SN490C has very good resistance to lamellar tearing properties, mainly used as an external plate of box column performance and other needs in the thickness direction (Z direction performance) components and parts in. SNB, Class C steel are on the upper limit of the yield point to make provision to prevent the plastic deformation energy dissipation member need not enter the site of plastic yield; and be strictly limited carbon equivalent phosphorus, and sulfur cap. SNC class on the sulfur content of steel made more stringent restrictions, and provides manufacturers an obligation to carry out ultrasonic flaw detection test, in order to ensure the performance of the thickness direction. Currently 70% of Japan's domestic construction steel plate for SN steel. Japan has developed a copper LY225, LY100 steel and other low-yield point steel and fire-resistant steel (FR steel). Aspects of the development and application of the United States and Europe and other countries are also high-strength steel and other high performance made a lot of contributions. As US production of steel plate by quenching and tempering of the A514, its yield point up to 690N / mm2, it can be used for welding.

  Relatively speaking, the type and quality of steel and industrialized countries are not. How is the research and development of new and efficient steel

  Placed in front of China's metallurgical front of scientists is an important task.

  Second, the application and development of new steel System
  In recent years, the country built a large number of large-span structures, grid and shell structure has been popular in the country, Zhang chord truss, suspension structure, there are many application examples; directly welded steel structure, light steel gantry just Tapered frame, arched corrugated metal roof and other light steel has also been everywhere; steel high-rise buildings are springing up in many cities; suitable for China's steel-concrete composite structures and hybrid structure has also been widely used; now many place in the construction and architectural sketches canopy cable-membrane structure; ....... It is no exaggeration to say that our country has become a testing ground for exhibition and various steel systems.

  Various structural systems have their own strengths, but strong vitality architecture has the following characteristics:

  (1) must be immutable geometry (except suspension, film and other tensile structures) space as a whole, under the effect of various types of action to maintain stability, the necessary bearing capacity and stiffness;
  (2) the strength of the structural materials should be fully utilized, so that the weight reclined to a minimum;
  (3) can take advantage of the strengths of the material, avoiding overcome its weaknesses;
  (4) make the structure of space and architectural space coordination, unity;
  (5) can be suited to their situation, production, ease of installation, good overall efficiency.

  At present, China is undergoing a massive capital construction, many large and complex steel works, including the 2008 Olympic venue construction projects are underway. Select Advanced and reasonable structure system, both to meet the architectural needs, but also to achieve technologically advanced, economical and reasonable, safe application, to ensure the quality is very important. Currently there is a pursuit of architectural style novelty, weird, but at the most bulky waste steel structure tendency is alarming.

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