There may be some rusting problems in the long-term storage of seamless honed steel tubes in the store. If the seamless steel pipe is rusted, it is not easy to sell it. So how can we remedy the rust of the seamless steel pipe?
1. Tool rust removal: The surface of the seamless steel pipe is mainly polished by using a wire brush and other tools to remove loose or raised scale, rust, welding slag, and the like. The 20G high pressure boiler tube has strict requirements on the steel grade used to manufacture the steel pipe. 20G high-pressure boiler tubes are often subjected to high temperature and high pressure conditions, and the tubes will oxidize and corrode under the action of high temperature flue gas and water vapor. Steel pipes are required to have high durability, high corrosion resistance and good structural stability. High-pressure boiler tubes are mainly used to manufacture superheater tubes, reheater tubes, air ducts, main steam tubes, etc. for high-pressure and ultra-high pressure boilers. The rust removal of the hand tool can reach the Sa2 level, and the rust removal of the power tool can reach the Sa3 level. If the surface of the seamless steel pipe is adhered to the iron oxide scale, the rust removal effect of the tool is not ideal, and the anchor depth required for the anti-corrosion construction cannot be achieved.
2, pickling: generally chemical and electrolytic two methods of pickling, pipeline anti-corrosion only chemical pickling, can remove oxide scale, rust, old coating, and sometimes can be used as sandblasting after rust removal. Although chemical cleaning can achieve a certain degree of cleanliness and roughness, its anchor pattern is shallow and it is easy to pollute the environment.
3, spray (throwing) shot derusting: spray (throwing) shot derusting is driven by high-power motor to spray (drow) the blade to rotate at high speed, so that the abrasive such as steel sand, steel shot, wire segment, minerals and so on under centrifugal force Spraying (polishing) the surface of the steel pipe not only completely removes rust, oxides and dirt, but also the seamless steel pipe can achieve the required uniform roughness under the action of abrasive violent impact and friction. Seamless steel tubes have hollow sections and are used in large quantities as pipes for transporting fluids, such as pipes for transporting petroleum, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, the steel pipe has a lighter weight when it has the same bending and torsional strength, and is an economical section steel.
4. Cleaning: use solvent (trait: transparent, colorless liquid), emulsion to clean the surface of seamless steel pipe to remove oil, grease, dust, lubricant and similar organic matter, but it can not remove the rust on the surface of seamless steel pipe , oxide scale, flux, etc., so it is only used as an auxiliary means in anti-corrosion production.