Definition of Galvanized Steel Pipe in Reinforcement Engineering Knowledge
2013-12-17
GalvanizedSteel pipeDivided into cold galvanized pipes and hot galvanized pipes, the former has been banned, while the latter is still temporarily advocated for use by the state.
Hot galvanized pipe is produced by making molten metal react with the iron substrate to form an alloy layer, thus combining the substrate and the coating.Steel pipeFirst, it undergoes acid pickling to removeSteel pipethe surface's iron oxide. After acid pickling, it is cleaned in a solution of ammonium chloride or zinc chloride or a mixed solution of ammonium chloride and zinc chloride, and then sent to the hot dip galvanizing tank. Hot galvanizing has advantages such as uniform coating, strong adhesion, and long service life.Steel pipeThe substrate undergoes complex physical and chemical reactions with the molten plating liquid to form a corrosion-resistant tightly structured zinc-iron alloy layer. The alloy layer integrates with the pure zinc layer andSteel pipethe substrate. Therefore, its corrosion resistance is strong.
Cold galvanized pipe refers to electro-galvanized pipe, which has a very low amount of galvanization, only 10-50g/㎡. Its own corrosion resistance is much worse than that of hot galvanized pipes. Regular galvanized pipe manufacturers mostly do not use electro-galvanization (cold galvanizing) to ensure quality. Only small enterprises with outdated equipment use electro-galvanization; of course, their prices are relatively cheaper. Currently, the Ministry of Construction has officially issued a document to eliminate outdated cold galvanized pipes and prohibits their use for water and gas pipelines in the future.Steel pipeThe cold galvanized coating is an electroplated layer where the zinc layer is independent fromSteel pipethe substrate in separate layers. The zinc layer is thin and simply adheres toSteel pipethe substrate, making it easy to fall off. Therefore, its corrosion resistance performance is poor. In newly built residences, using cold galvanizedSteel pipeas water supply pipes is prohibited.
Shenyang Tengfei Iron Corporation
Shenyang Tengfei Steel Pipe Co., Ltd.
Address: No.6 A 3, No.13 Road, Economic and Technological Development Zone, Shenyang City, Liaoning Province
E-mail:tfwelcome@163.com
Focus on us
