Cleaning And Rust Removal Of Steel Tube

In life, whether it is a ssaw steel pipe or a seamless steel pipe, it will rust if it is not properly maintained. Here we talk about the cleaning and rust removal of the steel pipe.

1. cleaningSolvents and emulsions are used to clean steel surfaces to remove oil, grease, dust, lubricants, and similar organics. However, they cannot remove rust, oxide scales, and welding flux on steel surfaces. Therefore, they are only used as an aid in antiseptic production.
2. tool rustThe main use of wire brush and other tools on the surface of the steel, can remove loose or tilt of the scale, rust, welding slag and so on. The manual tool derusting can reach Sa2 level, and the derusting of power tools can reach Sa3 level. If the steel plate surface is attached with a solid iron oxide scale, the rust removal effect of the tool is not ideal, and the depth of the anchoring lines required for anti-corrosion construction cannot be achieved.
3. picklingGeneral use of chemical and electrolytic methods for pickling, pipe anti-corrosion chemical pickling only, can remove oxide scale, rust, old coating, and sometimes can be used as a blasting rust after reprocessing. Although chemical cleaning can make the surface reach a certain degree of cleanliness and roughness, its anchorage is light and it is easy to cause pollution to the environment.
4. spray (throw) shot rustSpraying (throwing) shot rust removal is driven by a high-powered motor to rotate the jet (throwing) shot blade at a high speed so that abrasives such as steel grit, steel shots, wire segments, and minerals are sprayed on the surface of the steel pipe under centrifugal force. Not only can it thoroughly remove rust, oxides, and dirt, but it can also achieve the required uniform roughness under the abrasive impact of abrasive and frictional forces.

After spraying (throwing) shot rust removal, not only can the physical adsorption of the pipe surface be enlarged, but also the mechanical adhesion of the anti-corrosion layer to the pipe surface can be enhanced. Therefore, spraying (throwing) shot rust removal is the ideal rust removal method for pipeline anti-corrosion. In general, shot peening (sand) rust removal is mainly used for inner surface treatment of tubes. Shot peening (sand) rust removal is mainly used for outer surface treatment of tubes. There are several issues that need to be taken into account when using spray (throw) shot rust removal.

4.1 Rust levelFor steel pipe commonly used epoxy, vinyl, phenolic and other anti-corrosion coating construction process, it is generally required that the steel pipe surface reach near-white level (Sa2.5). Practice has proved that this kind of derusting grade can remove almost all scales, rust, and other contaminants. The depth of the anchoring pattern can reach 40~100?m, fully satisfying the adhesion requirements of the anticorrosion layer and the steel pipe, and spraying (throwing) the shot The rust process can achieve near-white (Sa2.5) technical conditions with lower operating costs and stable and reliable quality.

4.2 Spray (throw) Shot AbrasiveIn order to achieve the desired rust removal effect, the abrasive should be selected based on the hardness of the surface of the steel pipe, the degree of original rust, the required surface roughness, and the type of coating. For single-layer epoxy, two-layer or three-layer polyethylene coatings, Mixing abrasives of steel grit and steel pellets can achieve the ideal rust removal effect. Steel shots have the effect of strengthening the steel surface, while steel sand has the effect of etching the steel surface. Mixed abrasives of steel grit and steel shots (usually steel shots with a hardness of 40-50 HRC, steel grit with a hardness of 50-60 HRC can be used on various steel surfaces, even when used on grades C and D rusted steel surfaces, except The rust effect is also very good.

A worker from a steel pipe company, which is located in China.