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 and considered with some data: 1, weight lifting plant road : not less than 25 tons, can be considered as a heavy steel. 2, the amount of steel per square meter: greater than or equal 50KG / M2, can be considered heavy steel. 3, plate thickness main components: greater than or equal 10MM steel construction design, lightweight steel less useful. Another installation of steel structures, there are some reference value: if the cost per square meter of steel, the maximum component weight, the maximum span, structure, higher eaves, whether when these heavy steel or lightweight steel can provide empirical data to determine the plant, of course, Now many buildings are light and heavy steel are. But there is something we can be more sure that heavy steel: such as: petrochemical plant facilities, power plants factories, large span of stadiums, exhibition centers, high-rise or super high-rise steel structures. Anti-corrosion coating on steel processing research in recent years, the extraordinarily rapid development of steel construction. Steel also revealed wide application range of shortcomings, the more serious is the corrosion of steel. Corrosion protection of steel structures were reviewed. With the extensive application of steel construction, steel due to its own characteristics, and based on the construction of safety and durability, corrosion of steel structures has become increasingly prominent problem. At present, the world each year due to the economic losses caused by corrosion of the steel structure has been up to hundreds of billions of dollars; and steel due to an accident caused by corrosion of steel structure endanger the safe operation of the welder, the corrosion caused by a catastrophic accident has a lot to see. For welded steel and steel to withstand greater stress situations and under stress, the corrosion will be faster. Steel construction design, Huizhou steel structure, steel structure built by Peng Peng Jian Steel Co., Ltd., Dongguan City. Steel Co., Ltd., Dongguan City, Peng Jian (dgpengjian.cn) strong, credible, in Dongguan, Guangdong steel industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Peng built into the brilliant steel and you work for a better future!