First, raw material control The raw material of 20# precision seamless steel pipe is high-quality billet, so it is necessary to choose the appropriate steel grade and material, and at the same time ensure that the chemical composition, microstructure and surface quality of billet meet the requirements. When selecting billet, you should pay attention to the following points:
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Selection of steel grade and material: according to the purpose and performance requirements of the precision seamless steel pipe to be manufactured, choose the appropriate steel grade and material to ensure that the manufactured steel pipe has excellent mechanical properties and corrosion resistance.
Surface quality: the surface quality of billet has an important influence on the quality of steel pipe. Therefore, steel billets with good surface quality must be selected to avoid defects such as cracks and inclusions in the manufacturing process. ?
Chemical composition: the chemical composition of billet also has an important influence on the performance of steel pipe. Therefore, it is necessary to select steel billets whose chemical composition meets the requirements to ensure that the manufactured steel pipes have excellent mechanical properties and corrosion resistance.
II. Perforation process Perforation is the first process for manufacturing precision seamless steel pipes. It passes solid round steel through a special perforator to form a capillary. In this process, we need to pay attention to the following points:
Perforation speed and temperature: the control of perforation speed and temperature has an important influence on the diameter and shape of capillary. Therefore, it is necessary to choose the appropriate perforation speed and temperature to ensure that the diameter and shape of the capillary meet the requirements.
Capillary wall thickness: Capillary wall thickness has an important influence on steel pipe quality. Therefore, it is necessary to control the wall thickness of capillary in the process of perforation to ensure that the manufactured steel pipe has excellent mechanical properties and corrosion resistance.
3. Rolling process Rolling is one of the key links in the production of precision seamless steel pipes. It rolls the capillary through several rolling mills to make its diameter and shape meet the requirements. In this process, we need to pay attention to the following points:
Rolling temperature and speed: The control of rolling temperature and speed has an important influence on the precision and quality of steel pipes. Therefore, it is necessary to control the rolling temperature and speed in the rolling process to ensure that the manufactured steel pipe has excellent mechanical properties and accuracy.
Precision and synchronization of rolling mill: The precision and synchronization of rolling mill have an important influence on the quality of steel pipe. Therefore, it is necessary to ensure the accuracy and synchronization of each rolling mill, so as to ensure that the manufactured steel pipe has excellent accuracy and quality.
Fourth, the straightening process? Straightening is one of the important links in manufacturing precision seamless steel pipes. It straightens the steel pipe by straightener, eliminates stress and improves straightness. In this process, we need to pay attention to the following points:
Straightening temperature: the control of straightening temperature has an important influence on the quality of steel pipe. Therefore, it is necessary to control the straightening temperature in the straightening process to ensure that the manufactured steel pipe has good straightness and stability.
Straightening speed: the control of straightening speed also has an important influence on the quality of steel pipe. Therefore, it is necessary to control the straightening speed in the straightening process to ensure that the manufactured steel pipe has good straightness and stability.
Five, pickling passivation process? Pickling passivation is one of the important links in the production of precision seamless steel pipe. It uses acid solution and passivation solution to treat the surface of steel pipe to remove scale and dirt, and improve the corrosion resistance and service life of steel pipe. In this process, we need to pay attention to the following points:
Pickling solution selection and concentration control: Pickling solution selection and concentration control have an important influence on pickling effect. Therefore, it is necessary to choose the appropriate type and concentration of pickling solution to ensure good pickling effect and not damage the surface of steel pipe. ?