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1. Raw material preparation: precision seamless tube's raw materials are generally high-quality carbon steel and alloy steel, which need to be selected, cleaned and straightened for subsequent processing.
2. Smelting and continuous casting: after the raw materials are prepared, they are put into a smelting furnace for smelting to form molten steel. Then the molten steel is poured into a billet by a continuous casting machine for subsequent rolling.
3. Heating and rolling: the billet is heated, and then it is rolled by a high-pressure rolling mill for many times, so that the outer diameter and wall thickness of the tube blank are gradually reduced until it reaches the required pipe diameter and wall thickness.
4. Finishing and straightening: The rolled steel pipe needs finishing treatment, including deburring, port trimming and straightening. These processes can ensure the appearance quality and straightness of steel pipes and meet the requirements of high precision.
5. Cold rolling annealing: For some high-precision, thin-walled precision seamless tube, cold rolling annealing is needed. Cold rolling can further reduce the outer diameter and thickness of steel pipe and improve its accuracy; Annealing treatment can eliminate the internal stress produced during cold rolling and improve the mechanical properties of steel pipes.
6. NDT: NDT the finished precision seamless tube to ensure its internal and external quality meets the requirements. Non-destructive testing generally uses ultrasonic testing, ray testing, magnetic particle testing and other methods to detect internal and external defects and cracks of steel pipes.
7. Inspection and packaging of finished products: After nondestructive testing, precision seamless tube should conduct comprehensive quality inspection, including dimensional accuracy, wall thickness, surface quality and other indicators, so as to ensure that the requirements of customers are met. Finally, the qualified steel pipes are packed to avoid damage during transportation.
? During the manufacturing process in precision seamless tube, the following points should be noted:
1. Quality of raw materials: The quality of raw materials has a vital impact on the performance and quality of the final product. It is necessary to select high-quality carbon steel, alloy steel and other raw materials that meet the requirements, and strictly control the chemical composition and temperature during smelting and continuous casting.
2. Heating and rolling process control: Heating and rolling are one of the key links in precision seamless tube manufacturing. The parameters such as heating temperature and time, rolling pressure and speed must be strictly controlled to ensure the dimensional accuracy and mechanical properties of steel pipes.
3. Finishing and straightening: Finishing and straightening is an important link to ensure the straightness and appearance quality of precision seamless tube. It is necessary to use professional straightening equipment and technology to straighten and adjust the steel pipe for many times to ensure that its straightness and tolerance range meet the requirements.
4. nondestructive testing technology: nondestructive testing is one of the key links to ensure the internal and external quality of precision seamless steel pipes. It is necessary to use advanced nondestructive testing equipment and testing technology to conduct a comprehensive inspection of steel pipes in order to find their internal and external defects and cracks.
5. Personnel training and technical management: precision seamless tube's manufacturing needs professional technicians to operate and manage. Regular training and technical exchanges are needed for technicians to improve their skill level and experience accumulation, and to ensure the quality and safety in the production process. The manufacturing process in precision seamless tube needs careful operation and management of multiple processes. From raw material preparation to finished product packaging, all parameters and quality standards need to be strictly controlled to ensure that the quality and stability of the final product meet customer requirements.