Derusting method of S690QL steel plate

Pickling: The process of using acid solution to remove scale and rust on the surface for S690QL steel plate is called pickling. It is a method of cleaning the metal surface ,which is usually carried out together with pre-passivating treatment.

Shot blasting: Shot blasting is a cold treatment process, which is divided into shot blasting cleaning and shot blasting strengthening. As the name implies, shot blasting cleaning is to remove impurities such as surface oxide skin to improve the appearance quality of S690QL steel plate.

Shot blasting strengthening is to use high-speed moving projectile flow to continuously impact and strengthen the surface of the workpiece for S690QL steel plate, forces the surface and surface layer of S690QL steel plate to undergo changes such as microstructure modification during the cyclic deformation process, this can improve the fatigue fracture resistance of the material/part for S690QL steel plate, prevent fatigue failure, plastic deformation and brittle fracture, and increase the fatigue life.

Polishing: A processing method that reduces the surface roughness of the workpiece by mechanical, chemical or electrochemical action to obtain a bright and smooth surface of S690QL steel plate. Polishing does not improve the dimensional accuracy or geometric shape accuracy of the workpiece, but for the purpose of obtaining a smooth surface or mirror gloss, and sometimes to eliminate gloss (matting).

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