Steel Building is composed of steel material structure, is one of the main building structure type. The structure is mainly composed of steel and steel plate, steel column, steel truss and other components, the components or components are usually used between the weld, bolts or rivets connected. Because of its relatively light weight, and the construction is simple, widely used in large factories, venues, high-level areas.
Although China has outstanding achievements in the early iron structure, but long stay in the level of iron buildings. Until the end of the 19th century, China began to use modern Steel Building. After the founding of new China, the application of steel has been a great development, both in quantity and quality are far more than in the past. Light Steel Building of the floor by the cold-formed thin-walled steel frame or composite beam, floor OSB structural plate, support, connectors and other components. The materials used are oriented particleboard, cement fiberboard, and plywood. On these light floors can withstand 316 to 365 kg per square meter of load.
The number of Steel Buildings, marking a country or an area of economic strength and economic development. After 2000, China's national economy has increased significantly, the national strength has been significantly enhanced, steel production has become a world power, in the building proposed to "actively and rationally with steel", from the "restricted steel" shackles, steel Construction in economically developed areas gradually increased. In particular, around 2008, driven by the Olympic Games, there has been a boom in steel construction, strong market demand, to promote the rapid development of Steel Building, built a large number of Steel Buildings, airports, stations and high-rise buildings, of which some Steel construction in the production and installation technology has a world-class level, such as the Olympic Games national stadium and other buildings.
After the Olympic Games, steel construction has been popularized and sustainable development, Steel Building is widely used in construction, railways, bridges and residential areas, tens of thousands of steel enterprises of all sizes, the world's advanced steel processing equipment is basically complete, such as Multi-dimensional multi-dimensional drilling machine, multi-dimensional cross-line pipe cutting machine, corrugated plate automatic welding machine. And now hundreds of steel enterprises in the production level of the world's advanced level, such as the production of steel and super-level enterprises. In recent years, steel production each year up to more than 600 million tons, steel varieties can fully meet the building needs. Steel Building design specifications, Steel Building materials standards, Steel Building construction quality acceptance norms, as well as a variety of professional norms and basic laws and regulations. 
Steel industry downstream industry on the development of steel industry has a greater traction and driving role, their demand changes directly determine the future development of the industry.
1. Steel upstream industry for steel and other raw materials supply industry
Iron and steel industry is the material basis for the development of steel industry, the steel industry's technological progress for the application of Steel Building to create favorable conditions. Some large enterprises in the domestic steel industry have already started research and development of steel varieties and technologies for building structures. They have developed high strength steel and refractory, weather resistant, resistant to seawater, anti-layered tear, low temperature resistant steel, and H Performance Caitu steel, cold-formed steel, etc., for the development of steel industry has laid a good application base.
2, the impact of the upstream and downstream on the industry
The upstream Steel Building is mainly the steel industry, steel product price fluctuations directly affect the procurement costs of the industry. On the whole, the upstream industry is basically a competitive industry, the production of steel for the various types of steel, steel, steel and other steel, which H-beam and plate is the most commonly used Steel Building products. Industry insight research data 2011 crude steel production reached 696 million tons, the output is relatively saturated, steel production of raw materials required to obtain a stable supply.
Downstream industry on the development of steel industry has a greater traction and driving role, their demand changes directly determine the future development of the industry. Steel Building with its high strength, light weight, good seismic performance, high degree of industrialization, short construction period, plasticity, energy saving and environmental protection and other comprehensive advantages in industrial plants, municipal infrastructure construction, cultural and educational construction, electricity, bridges, offshore oil Engineering, aerospace and other industries have been widely used, the market gradually expand the space. In addition, once the residential steel market to achieve a breakthrough, and gradually replace the traditional architectural form into the field of residential construction, steel industry will lead to explosive growth.