Manufacturing process of cold rolled seamless tube

Cold-rolled seamless tube is a type of seamless tube. Seamless tube is a long strip of steel with a hollow section and no seams around it. Compared with welded steel pipes, cold-drawn seamless tubes are steel processed through a series of cold drawing, cold bending and other processes in a normal temperature environment. Compared with cold-rolled seamless tubes, hot-rolled seamless tubes are steel types processed above the recrystallization temperature.

Raw material selection:

The selection of raw materials for cold-rolled seamless tubes is the most basic link in the manufacturing process. Under normal circumstances, the raw materials selected should be high-quality carbon structural steel or alloy structural steel. The quality of raw materials directly affects the quality and performance of the finished pipes, so the material selection needs to be very careful.

Cold rolled seamless tube processing technology:
1. Pickling of steel pipe blanks: pickling the raw materials to remove surface oxide scale, rust and other impurities.
2. Heating treatment: Heating the billet to a certain temperature to ensure that subsequent cold rolling processing can proceed smoothly. According to different steel types and different pipe specifications, the heating temperatures are also different.
3. Cold rolling processing: The billet is continuously rolled on a cold rolling mill. After multiple cold rollings, the raw material is continuously stretched to form a seamless steel tube with precise specifications and high quality.
4. Heat treatment: In order to eliminate the stress generated during cold working and improve the mechanical properties of seamless steel pipes, heat treatment is usually performed. The specific method is to heat the steel pipe to a certain temperature, then keep it warm for a certain period of time, and finally gradually cool it.

Inspection and quality control of cold-rolled seamless tubes:
In order to ensure the quality of cold-rolled seamless tubes, strict inspection and quality control are required. It mainly includes the following aspects:
1. Appearance inspection: Conduct appearance quality inspection on the surface of the steel pipe. Mainly check the surface flatness, roundness, outer diameter, wall thickness, etc. of the pipe.
2. Chemical composition analysis: Analyze the chemical composition of the steel pipe to ensure compliance with relevant standards.
3. Mechanical performance testing: Test the strength, toughness and other mechanical properties of the steel pipe to determine whether the quality of the steel pipe meets the standard requirements.
4. Penetration testing: Penetration testing is performed on the internal and external surfaces of the steel pipe to detect whether there are cracks, bubbles and other defects.

The above content is a detailed introduction to the cold-rolled seamless tube process. I believe readers have learned about some key links and technical indicators in the manufacturing process of cold-rolled seamless tubes. During this process, special attention needs to be paid to raw material selection and quality control to ensure the production of high-quality seamless tubes.

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