CS seamless pipe has a hollow section and is widely used as a pipeline for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, steel pipe is lighter in flexural and torsional strength. It is an economical section steel and is widely used in the production of structural parts and mechanical parts, such as oil drill pipes, car drive shafts, and bicycle frames. And steel scaffolding used in construction. Making ring parts with steel pipes can improve the utilization rate of materials, simplify the production process, save materials and processing time, such as rolling bearing rings, jack sets, etc., which have been widely used in steel production. Steel pipe is still an indispensable material for various conventional weapons, and the barrel, barrel, etc. must be made of steel pipe. Steel pipes can be divided into round pipes and special-shaped pipes according to the shape of the cross-sectional area. Because the area of the circle is the largest under the condition of equal perimeter, more fluid can be transported with a circular tube. In addition, when the ring section is subjected to internal or external radial pressure, the force is relatively uniform, so most steel pipes are round pipes.

Rust removal method

1) Tool rust removal. Mainly use tools such as wire brushes to grind the surface of steel, which can remove loose or raised oxide scale, rust, welding slag, etc. The rust removal of hand tools can reach Sa2 level, and the rust removal of power tools can reach Sa3 level. If the steel surface is adhered to a firm scale of iron oxide, the rust removal effect of the tool is not ideal, and the anchor pattern depth required for anti-corrosion construction cannot be achieved.

2) Spray (throwing) rust removal. Spraying (throwing) rust removal is to drive the spraying (throwing) blades to rotate at high speed through a high-power motor, so that abrasives such as steel sand, steel shot, iron wire segments, minerals, etc. are sprayed (throwing) on the surface of the steel pipe under the action of centrifugal force. , not only can completely remove rust, oxides and dirt, but also the steel pipe can achieve the required uniform roughness under the action of abrasive impact and friction; after spraying (throwing) rust removal, it can not only expand the surface of the pipe physical adsorption, and can enhance the mechanical adhesion between the anti-corrosion layer and the surface of the pipe. Therefore, spraying (throwing) rust removal is an ideal rust removal method for pipeline anticorrosion. Generally speaking, shot blasting (sand) derusting is mainly used for inner surface treatment of pipes, and shot blasting (sand) derusting is mainly used for outer surface treatment of pipes.

3) Sandblasting and rust removal. A rust removal method that uses high-pressure air to bring out the quartz sand and spray it to the surface of the component. The origins of quartz sand are: river sand, sea sand and artificial sand. The cost of sand is low and has a wide range of sources, but it pollutes the environment greatly; rust removal is completely dependent on manual operation, and the surface roughness of the components after rust removal is small, and it is difficult to meet the requirements of friction coefficient. Sea sand should be freed of its salts before use.

The above two rust removal methods require the environmental humidity to be less than 85%.

4) Pickling and rust removal. Pickling rust removal is also known as chemical rust removal. The principle is to use the acid in the pickling solution to chemically react with the metal oxide to dissolve the metal oxide and remove the rust and dirt on the surface of the steel. But pickling can't achieve or improve the surface roughness effect. And after pickling and rust removal, a lot of clean water must be cleaned and passivated; many waste water, waste acid and acid mist formed by it constitute environmental pollution. If it is not handled properly, it will also cause over-etching of the metal surface and cause pitting. It is rarely used now.

5) Technical and power rust removal. Things are simple and easy to construct. However, the labor intensity is high and the rust removal quality is poor. This method can only be selected under conditions that other methods do not have. For example, the trimming of a single component or some rust removal treatment at the equipment site. Its commonly used things are: grinder, blade, wire brush, emery cloth, etc.