Future development of steel structure industry 1. The upstream industry of steel structure is the material foundation of steel structure industry, the technological progress of steel industry has created favorable conditions for the application of steel structure. Some large enterprises in the domestic steel industry have started research development on the varieties technologies of structural steel for construction. They have successively developed high strength steel fire-resistant, weather-resistant, seawater-resistant, lamellar tear-resistant low temperature-resistant steels, as well as h-section steel, high-performance color-coated steel plate, cold-formed section steel, for the development of steel structure industry has laid a good foundation for the application. 2. The upstream downstream of steel structure is mainly steel industry, the fluctuation of steel product price directly affects the purchasing cost of the industry. As a whole, the upstream industry is a competitive industry, producing all kinds of steel plate, steel pipe, steel section, other steel products used in steel structure, among which h-beam plate are the most commonly used products in steel structure construction. Industry Insight Research data in 2011 crude steel output of 696 million tons, the output is relatively saturated, steel production of raw materials required to be able to obtain a stable supply. The downstream industry has a large traction driving effect on the development of steel structure industry, their demand changes directly determine the development of the industry in the future. Steel structure with its high strength, light weight, good seismic performance, high degree of industrialization, short construction cycle, strong plasticity, energy-saving environmental protection, other comprehensive advantages, it has been widely used in industrial buildings, municipal infrastructure construction, cultural sports construction, electric power, bridges, offshore oil engineer