Surface cleaning method for seamless steel pipe

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Surface cleaning method for seamless steel pipe

Surface cleaning method for seamless steel pipe

1. cleaning

Solvents and emulsions are used to clean the surface of steel to remove oil, grease, dust, lubricants and similar organic matter, but it cannot remove rust, scale (corrosion products formed by oxidation), welding flux, etc. on the surface of steel, so Used only as an aid in antiseptic production.

 

2. tool derusting

The surface of steel is mainly polished with tools such as wire brushes, which can remove loose or raised oxide scale, rust, welding slag, etc. The rust removal of manual tools can reach Sa2 level, and the rust removal of power tools can reach Sa3 level. If the steel surface is firmly adhered to the iron oxide scale, the rust removal effect of the tool is not ideal, and it cannot reach the depth of anchor pattern required for anticorrosion construction.

 

3. Pickling

Generally, chemical and electrolytic methods are used for pickling. Pipeline anticorrosion only uses chemical pickling, which can remove scale, rust, and old coatings. Sometimes it can be used as a reprocessing after sandblasting and rust removal. Although chemical cleaning can make the surface reach a certain degree of cleanliness and roughness, its anchor pattern is shallow and it is easy to cause pollution to the environment.

 

4. spray (polishing) derusting

Spraying (polishing) rust removal is to drive the spraying (polishing) blades to rotate at high speed by a high-power motor, so that abrasives such as steel sand, steel shots, wire segments, minerals, etc. are sprayed (polished) 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 tube can achieve the required uniform roughness under the action of the violent impact and friction of the abrasive. Seamless steel pipe has a hollow cross 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 weight when it has the same bending and torsional strength, and it is an economical section steel.