Welded steel tube is a steel pipe made of steel plate or strip steel after being crimped and welded, generally with a length of 6 meters. The production process of welded steel pipe is simple, the production efficiency is high, there are many varieties and specifications, and the investment in equipment is small, but the general strength is lower than that of seamless pipe.
The basic requirements for anti-corrosion construction of welded steel pipes include
1. The processed components and finished products should be checked and accepted before they can be treated on the outside.
2. The burrs, electric welding coating, welding nodules, spatter, dust and scale on the surface of welded steel pipes should be cleaned before rust removal, and loose oxide scales and thicker rust layers should be removed at the same time.
3. If there is oil and grease on the surface of the welded steel pipe, it should be cleaned before derusting. If there is oil and grease only on a part of the area, local treatment methods can usually be used; if there is a large area or the entire area, solvent or hot alkali can be used for cleaning.
4. When there are acids, alkalis and salts on the surface of welded steel pipes, hot water or steam can be used to wash them off. However, attention should be paid to the disposal of waste water so as not to pollute the environment.
5. Some newly rolled stainless steel pipes are coated with maintenance paint in order to avoid corrosion during short-term storage and transportation. For stainless steel pipes coated with curing paint, it should be disposed of according to the specific situation. If the curing paint adopts a two-component coating cured by a curing agent, and the coating is basically intact, it can be treated with abrasive cloth, stainless steel tube velvet or lightly sprayed, and the next process can be carried out after the dust is cleaned. .
6. For the maintenance coating of shop primer or general primer on the surface of welded steel pipes, the treatment method should be determined according to the current situation of the coating and the next matching paint. Those that cannot be used for further coating or affect the adhesion of the next coating should be completely removed. Special attention should be paid when selecting stainless steel pipes to construct fireproof coatings.
The basic requirements for anti-corrosion construction of welded steel pipes include
1. The processed components and finished products should be checked and accepted before they can be treated on the outside.
2. The burrs, electric welding coating, welding nodules, spatter, dust and scale on the surface of welded steel pipes should be cleaned before rust removal, and loose oxide scales and thicker rust layers should be removed at the same time.
3. If there is oil and grease on the surface of the welded steel pipe, it should be cleaned before derusting. If there is oil and grease only on a part of the area, local treatment methods can usually be used; if there is a large area or the entire area, solvent or hot alkali can be used for cleaning.
4. When there are acids, alkalis and salts on the surface of welded steel pipes, hot water or steam can be used to wash them off. However, attention should be paid to the disposal of waste water so as not to pollute the environment.
5. Some newly rolled stainless steel pipes are coated with maintenance paint in order to avoid corrosion during short-term storage and transportation. For stainless steel pipes coated with curing paint, it should be disposed of according to the specific situation. If the curing paint adopts a two-component coating cured by a curing agent, and the coating is basically intact, it can be treated with abrasive cloth, stainless steel tube velvet or lightly sprayed, and the next process can be carried out after the dust is cleaned. .
6. For the maintenance coating of shop primer or general primer on the surface of welded steel pipes, the treatment method should be determined according to the current situation of the coating and the next matching paint. Those that cannot be used for further coating or affect the adhesion of the next coating should be completely removed. Special attention should be paid when selecting stainless steel pipes to construct fireproof coatings.
