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 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. Besides the 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 rust removal is driven by a high-power motor jet blade high-speed rotation, so that the steel sand, steel ball and other abrades under the action of centrifugal force on the surface of the steel pipe spraying (throwing) treatment, so that not only can completely remove rust, oxide and dirt, but also under the action of abrasive impact and friction force, steel pipe can also achieve the required uniform roughness. After the rust removal by spraying, not only the physical adsorption of the steel tube surface is expanded, but also the mechanical adhesion between the anticorrosive layer and the pipe surface is enhanced. Spraying is an ideal way to remove rust in pipeline. Shot peening (sand) is mainly used for pipe inner surface treatment, shot peening (sand) 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 steel tube surface, the original degree of rust, the required surface roughness, the type of coating, etc. The mixture of steel sand and steel pellets is easier to achieve the ideal effect of rust removal. Steel pellets can strengthen the steel surface, while steel sand can etch the steel surface. The mixed abrasive of steel sand and steel pellets, usually the hardness of steel pellets is 40 ~ 50HRC, the hardness of steel sand is 50 ~ 60HRC can be used for various steel surfaces, even if it is used on the surface of grade C and grade D corroded steel, 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 for the steel pipe surface, and constantly explore, summarize and improve the surface treatment method of the steel pipe.