How to do the surface treatment of spiral submerged arc welded steel pipe

1, cleaning:

Application of solvents, emulsions to clean the appearance of steel to achieve the removal of oil, grease, dust, smoothing agents and similar organic matter, Liaoning spiral pipe, but it can not remove the appearance of steel rust, oxidized skin, welding flux, and so on, and therefore in the anti-corrosion production is only used as a complementary measure.

2, tool rust:

The primary use of wire brushes and other tools on the steel surface grinding, you can remove loose or warped oxide, rust, welding slag and so on. Hand tools to remove rust can reach Sa2 level, power tools to remove rust can reach Sa3 level, if the steel exterior attached solid iron oxide, tools to remove rust results are not ideal, not up to the depth of the anchor pattern required by the anticorrosion construction.

3、Acid washing:

Commonly use chemical and electrolysis two ways to do pickling disposal, pipeline anticorrosion only chemical pickling, can remove the oxide skin, rust, old coatings, sometimes available as a sandblast rust removal after re-disposal. Chemical cleaning can certainly make the appearance to reach a certain degree of cleanliness and roughness, but its anchor pattern is shallow, and easy to form pollution to the situation.

4、Spray (throw) injection descaling:

Spray (throw) shooting rust removal is driven by a high-power motor spray (throw) shooting blade high-speed twisting, so that the steel sand, steel shot, wire segments, minerals and other abrasives in the centrifugal force effect of the steel pipe appearance for spray (throw) shooting disposal, not only can purge rust, oxides and dirt, and steel pipe in the abrasive ferocious impact and friction under the effect of the average roughness of the demand can also be reached.

After spraying (throwing), it can not only extend the physical adsorption effect on the appearance of the pipe, but also strengthen the mechanical adhesion effect between the anticorrosion layer and the appearance of the pipe. Therefore, spraying (throwing) descaling is the ideal descaling method for pipe anticorrosion. Generally speaking, shot blasting (sand) descaling is mainly used for the disposal of the inner appearance of the pipe, and shot blasting (sand) descaling is mainly used for the disposal of the surface of the pipe.