Construction quality steel works may variability problem with the extension of the outside world will change and the time and constantly evolving, quality defects gradually reflected. For example, the weld steel member changes due to stress, so they had no weld cracks cracks: As the role of hydrogen after welding activities can be delayed in the weld cracks. Another example is the component of long-term bear overload, the steel components to be produced under the arch bending deformation, resulting in problems. Frequent sex is due to our modern building with concrete structures mainly engaged in construction management and technical staff of the steel fabrication and construction technology is relatively unfamiliar to migrant workers mainly construction workers but do not know the specific steel works The scientific method of construction steel, resulting in the construction process, frequent accidents. Chemical treatment is a chemical treatment actual pickling rust method, with an acidic solution and the metal oxide (rust) a chemical reaction to produce salts steel metal housing, and out of the metal surface. Acidic solution commonly used are: sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid. Operation in the acidic solution is applied to the metal parts of rust and rust is removed and allowed to slowly react chemically. Rinse after application to remove rust steel design engineering, and the reaction solution with a weak base, wipe dry and then rinse after drying, to prevent rust quickly. For pickled need roughened metal surface treatment or phosphate treatment, mainly to increase the metal surface and the paint adhesion. When concentrated sulfuric acid diluted Dongguan steel material, should slowly poured sulfuric acid in water containers, and keep stirring, not vice versa, so as not to spill liquid sulfuric wounding. 10. Common lifting equipment: gantry crane tower crane crawler crane truck crane mobile cranes mast cranes hoisting machine turn jack hoist bridge crane. Dongguan steel structure design, Peng Jian steel (certified), Shenzhen, Dongguan City, the steel structure is provided by Peng Jian Steel Limited. Steel Co., Ltd., Dongguan City, Peng Jian (dgpengjian.cn) is Dongguan, steel leader, over the years, the company is implementing the 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 build a better future for steel.