The production and manufacturing process of small-diameter thick-walled seamless steel pipes
Small-diameter thick-walled seamless steel pipe is a kind of metal pipe with excellent performance, which is widely used in petroleum, chemical, electric power, construction and other fields. The manufacturing process involves many links, and the following will introduce the production and manufacturing process of small-diameter thick-walled seamless steel pipes in detail.
1. Preparation of raw materials.
The production of small-diameter thick-walled seamless steel pipes requires high-quality raw materials, including high-quality steel billets, steel pipe billets, etc. Before production, the raw materials need to be inspected for quality to ensure that their quality meets the standard requirements. At the same time, it is necessary to carry out reasonable material preparation according to production needs to ensure the raw materials in the production process.
2. Heating. Heating is an important part of the production of small-diameter thick-walled seamless steel pipes, the purpose of which is to soften the steel tube billet for subsequent forming and welding. During the heating process, it is necessary to pay attention to controlling the heating temperature and time to avoid over-burning and oxidation. At the same time, it is necessary to adopt suitable heating methods, such as electric induction heating, gas heating, etc., to improve heating efficiency and quality.
3. Molding. The forming of small-diameter thick-walled seamless steel pipes adopts the roll forming process, and the steel pipe blanks are gradually formed into the required shape size and wall thickness through multiple rolls and adjusting the roller spacing. In the molding process, it is necessary to control the rolling speed, pressure and other parameters to ensure the molding quality. At the same time, care needs to be taken to keep the molding tools clean and maintained to avoid affecting the quality of the product.
Fourth, welding. The welding of small-diameter thick-walled seamless steel pipes adopts high-strength welding technology, such as laser welding, plasma arc welding, etc. During the welding process, it is necessary to control the welding speed, current, voltage and other parameters to ensure the welding quality. At the same time, it is necessary to pay attention to the treatment of welded joints to avoid welding defects and stress concentration.
5. Heat treatment.
Heat treatment is an important part of the production of small-diameter thick-walled seamless steel pipes, and its purpose is to improve its mechanical properties and corrosion resistance by changing the microstructure of steel pipes. Heat treatment can be quenched, tempered, annealed and other ways, according to different use requirements to choose the appropriate heat treatment process. At the same time, it is necessary to pay attention to controlling the temperature and time of heat treatment to avoid overheating and oxidation.
6. Surface treatment.
The surface treatment of small-diameter thick-walled seamless steel pipes can be sprayed, electroplating, hot-dip plating and other methods to improve their corrosion resistance and aesthetics. In the process of surface treatment, it is necessary to control the processing temperature, time, coating thickness and other parameters to ensure the quality of surface treatment. At the same time, it is necessary to pay attention to the environmental protection of surface treatment and take appropriate treatment measures to reduce pollution.
7. Quality inspection.
The quality inspection of small-diameter thick-walled seamless steel pipes is an important part of the production process, including appearance inspection, size inspection, non-destructive testing and other methods. In the process of quality inspection, it is necessary to strictly control the testing standards and testing methods to ensure that the product quality meets the standard requirements. At the same time, it is necessary to pay attention to the maintenance and update of testing equipment to improve the accuracy and reliability of detection.
8. Packaging and transportation.
The packaging and transportation of small-diameter thick-walled seamless steel pipes need to be reasonably designed and arranged according to customer requirements and transportation methods. During the packaging process, suitable packaging materials and technologies need to be used to ensure that the product is not damaged during transportation. At the same time, it is necessary to pay attention to the identification and traceability of products, and establish a sound product traceability system.
To sum up, the production and manufacturing process of small-diameter thick-walled seamless steel pipes involves multiple links, each of which has its own special technical requirements and quality standards. In order to produce high-quality small-diameter thick-walled seamless steel pipes, it is necessary to strengthen the technology research and development and quality control in the production process to improve production efficiency and product quality.