The role of steel shot in the surface treatment of steel pipe

　　With the development of economy, the steel pipe is widely used in the transportation industry of various chemical substances. The surface treatment of steel pipe is one of the key factors to determine the service life of the transportation pipe. In addition to coating type, coating quality and construction environment, the surface treatment of steel pipe also has a great influence on the life of anticorrosive layer. This is the steel ball, steel sand will come in handy.

　　Spray derusting is driven by high power motor jet blade high-speed rotation, so that abrasive sand, steel ball under the action of centrifugal force on the surface of the steel pipe spraying (throwing) treatment, so that not only can completely remove rust, oxides and dirt, but also under the action of abrasive fierce impact and friction force, steel pipe can also achieve the required uniform roughness. The mechanical adhesion between the anticorrosive layer and the surface of the pipe is enhanced not only by enlarging the physical adsorption on the surface of the steel pipe but also by spraying the steel pipe. Jetting is an ideal way to remove rust in pipeline. Shot blasting (sand) rust removal is mainly used for pipe inner surface treatment, shot blasting (sand) rust removal is mainly used for pipe outer surface treatment. Several problems should be paid attention to when using spray to remove rust.

　　Abrasives can be selected according to the hardness of the surface of the steel pipe, the original degree of rust, the required surface roughness, the coating type, etc. The mixture of steel sand and steel pellets is easier to achieve the ideal effect of rust removal. Steel shot can strengthen the steel surface, and steel sand can etch the steel surface. The abrasive mixture of steel sand and steel shot, usually the hardness of steel shot is 40 ~ 50HRC, the hardness of steel sand is 50 ~ 60HRC can be used for all kinds of steel surface, even if it is used in C and D grade rust steel surface, the rust removal effect is also very good.

　　The surface treatment of the steel pipe seriously affects the service life of the pipe, is also the most simple and direct treatment method, so we should strictly comply with the requirements of the anticorrosive layer specification on the surface of the steel pipe, and constantly explore, summarize and improve the surface treatment method of the steel pipe.