? Wuxi Duorunde Steel Tube Co., Ltd (My Answer); The manufacturing steps for small diameter precision steel tubes, precision tubes, alloy steel tubes, precision seamless steel tubes, precision rolled tubes, and precision steel tubes may vary, but they usually include some of the following major processes:
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1. Preparation of raw material: Selection of suitable pipe billet, usually ingot or continuous casting billet.?
2. Heating: the billet is heated to reduce the hardness of the material and increase the plasticity.
3. Punching: The heated billet is passed through a piercing needle to form a hollow tube blank.
4. Rolling: Processing the shape and size of the pipe blank using multiple rolling passes.
5. heat treatment: according to the needs of the steel pipe heat treatment to improve its mechanical properties and service life.
6. Non-destructive testing: Non-destructive testing is performed on the steel pipe to ensure that its internal and external quality meets the requirements.
7. Finishing: A series of cold working and finishing processes are carried out to obtain the required accuracy and surface quality.
8. Painting or plating: according to the needs, the steel pipe is painted or plated to increase its anti-corrosion properties and service life.
The following is a detailed description of these steps:
1. Preparation of raw materials: According to the material and specification of the required steel pipe, choose the suitable ingot or continuous casting billet. Ingots need to go through the process of melting and pouring, while continuous casting billets come directly from the process of continuous casting.
2. Heating: The raw material is heated, usually at a temperature of 1000-1200°C, to reduce the hardness of the material and increase the plasticity. This facilitates subsequent rolling and forming.
3. Punching: The heated billet is passed through a piercing needle to form a hollow tube blank. This process also includes the initial machining of the blank shape.
4. Rolling: The shape and size of the tube blank is processed using multiple rolling passes. This usually includes two stages of roughing and finishing, roughing is used to process the billet into close to the final shape and size of the billet, while finishing is used to accurately control the outer diameter of the pipe, wall thickness and other parameters.
5. Heat Treatment: According to the need, the steel pipe is heat treated to improve its mechanical properties and service life. This usually includes quenching, tempering, annealing and other treatment processes.
6. Non-destructive testing: Non-destructive testing is carried out on tubes to ensure that their internal and external quality meets the requirements. This is usually done using non-destructive testing methods such as ultrasonic testing, radiographic testing, and eddy current testing.
7. Finishing: A series of cold working and finishing processes are carried out to obtain the required accuracy and surface quality. This includes straightening, resharpening, polishing, and other processes.
8. Painting or plating: According to the needs of the steel pipe for painting or plating treatment, in order to increase its anti-corrosion properties and service life. This usually includes treatment processes such as applying antirust paint and galvanizing.
The above are the general steps for manufacturing small diameter precision steel tubes, precision tubes, alloy steel tubes, precision seamless steel tubes, precision rolled tubes and precision steel tubes. However, the actual production may be adjusted according to different materials and specifications. For example, for high-precision or special-shaped tubes, it may be necessary to use more advanced manufacturing processes and technologies, such as CNC machine tools and laser cutting. At the same time, in order to improve production efficiency and reduce costs, it is also necessary to continuously optimize the production process and management.