How to remove rust of seamless steel pipe

Seamless steel pipe is a kind of circular, square and rectangular pipe with hollow section and no seam around. Seamless steel pipe is made of steel ingot or solid tube blank by piercing, then hot rolling, cold rolling or cold drawing. Generally, there are three ways to remove rust from seamless steel pipe. The following is a detailed introduction to the derusting method of seamless steel pipe.

1. Cleaning
Solvent and emulsion are used to clean seamless steel pipe surface to remove oil, grease, dust, lubricant and similar organic matters. However, it can not remove rust, oxide scale and welding flux on seamless steel pipe surface, so it is only used as auxiliary means in anticorrosion production.

2. Derusting tools
Steel wire brush and other tools are mainly used to polish the seamless steel pipe surface, which can remove loose or warped oxide scale, rust, welding slag, etc. Manual tool rust removal can reach Sa2 level, and power tool rust removal can reach Sa3 level. If the seamless steel pipe surface is firmly attached with oxide scale, the effect of tool rust removal is not ideal, and the depth of anchor pattern required by anti-corrosion construction can not be reached

3. Pickling
Generally, chemical and electrolytic methods are used for pickling treatment. Only chemical pickling is used for pipeline anti-corrosion, which can remove oxide scale, rust and old coating. Sometimes it can be used as the re-treatment after sand blasting. Although chemical cleaning can make the seamless steel pipe surface to a certain degree of cleanliness and roughness, but its anchor lines are shallow and easy to cause environmental pollution.