Steel is a new kind of economic construction steel. H beam cross-section shape of economic rationality, good mechanical properties, rolling cross-section extends over all the points on a uniform internal stress is small, compared with the ordinary I-beam, with a section modulus, light weight, saving advantages of the metal, construction can structure to reduce 30-40%; and its parallel inner and outer legs, leg-side is the right angles, assembled into composite components, saving welding, riveting work amounted to 25%. Commonly used in the required commitment cut capacity, good stability, a large section of building (such as factories, high-rise buildings, etc.), as well as bridges, ships, hoisting and conveying machinery, equipment foundation, frame, foundation piles. H-beam steel by the word developed from the optimization of the mechanical properties of a section of the economy more good cross-section of steel, especially in cross-section with the letters "H" the same as the name. Its characteristics are as follows: → flange width, lateral stiffness. Bending ability. → flange allows connection of two parallel surfaces, processing, and ease of installation. Compared with the I-beam welding → photo, low cost, high precision, residual stress, without the expensive welding and weld testing, saving about 30% of the cost of steel production. → load the same section. Hot-rolled H steel weight than conventional steel 15% -20%. → compared with the concrete structure, hot-rolled H steel can increase the use of an area of 6%, and reduce the structure weight of 20% to 30% reduction in structural design of internal forces. T → H beam can be processed into steel, the cellular beam can be formed by the combination of various cross section forms, great to meet engineering design and production needs. H section steel is mainly used for engineering, plant equipment, machinery, bridges, highways, houses, etc.; mechanical and physical properties of good, solid, energy conservation and environmental effects. Steel H-section steel is an economical, widely used in industry, buildings, bridges, oil rigs, etc., according to forecast 2005 demand of approximately 250 million tons H section steel, the demand for 500 million tons in 2010, but China H beam production capacity of 120 tons, the market demand is very huge.