_ Peng Jilin steel truss steel construction steel _ Maintenance Ltd., Dongguan City, Peng was built by steel. Steel Co., Ltd., Dongguan City, Peng Jian (dgpengjian.cn) Guangdong Dongguan, steel leader, over the years, the company is implementing scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Peng leader in steel construction with the staff warmly welcome all inquiries negotiations to create Peng Jian Steel a better future. Determination of heavy steel structure and light steel does not have a uniform standard, a lot of experienced designers and project managers are often not fully say it, but we can be judged by considering and to some of the data: 1, weight lifting plant traffic : not less than 25 tons of glass curtain wall steel frame, can be considered as a heavy steel. 2, the amount of steel per square meter: not less than 50KG / M2 steel truss installation, can be considered heavy steel. 3, the plate thickness main components: greater than or equal 10MM, light steel less useful. Also, there are reference values: If the cost per square meter, the maximum component weight, the maximum span, structure, higher eaves, whether when these heavy steel or lightweight steel for the judge to provide empirical data on the plant, of course, many of the buildings are now light and heavy steel are. But there is something we can be more sure that heavy steel: such as: petrochemical plant facilities, plant plants, large-span stadiums, exhibition centers, senior or super high-rise steel structures. Steel plant how to corrosion? Steel design requirements indicated in the intensity level of steel, connecting material model, form and weld seam quality level and construction requirements. A grade of steel is not guaranteed impact toughness, the carbon content of omission delivery conditions, it can not be used for earthquake-proof and welded structures (This statement is not accurate, but the design people can accept, in fact, can not weld or solder, is the carbon equivalent decision Steel truss maintenance, rather than the carbon content); in the actual project, in addition to the lower flange of large-span heavy duty crane girder docking, as well as large-span steel bridge docking tension member of this very quality requirements weld seam of high-level requirements for steel, other occasions rarely used level. Generally require two. For fillet welds, except in the case of penetration requirements (eg for a large fillet wheel pressure on the crane beam flange and web connections), its quality grade requirements two outside, usually with three other occasions level.