Why is the wall thickness in the circumferential direction of seamless steel pipes inconsistent, and sometimes the difference is quite large?

The main reasons for inconsistent wall thickness in seamless steel tubes during the production process are as follows: 1. Quality of raw materials: If the uniformity of the original round steel material is poor, it will directly affect the consistency of the wall thickness after the tube is processed. 2. Uneven heating: If the heating before the rolling process is uneven, it will result in varying plasticity levels of the material, thereby affecting the uniformity of the wall thickness. 3. Rolling process: Rolling is a key step in the manufacturing of seamless steel pipes. If the rolling mill is not adjusted properly or the rollers wear unevenly, it will result in uneven wall thickness of the finished steel pipes. 4. Drawing process: During the drawing process, uneven drawing forces or uneven wear of the die can also lead to uneven wall thickness in the steel pipe. 5. Cooling rate: During the cooling process, uneven cooling rates and distribution of the cooling medium can also affect the consistency of the tube wall thickness. Due to the combined effect of these factors, it is difficult to ensure a completely uniform wall thickness in the production of seamless steel pipes, especially in the manufacturing of pipes of large sizes and made from special materials. Therefore, when purchasing and using seamless steel pipes, it is very important to choose manufacturers with a good reputation and stable quality. .

This post was last edited by CHANGBAISHI on 2024-8-20 06:42. Should measurements be taken at the cut surface? It is necessary to grind and smooth that area before taking accurate measurements. If the obtained value is as stated, it is recommended to replace it or return it; it is better to purchase from well-known, reputable brands. For reference.

If it exceeds the allowed tolerance range, return can be considered

Inconsistent wall thickness is caused by various factors during the manufacturing process; therefore, standards specify allowable deviation ranges for wall thickness. Values within these ranges are considered acceptable and can be used, while those exceeding the specified range are deemed unacceptable and can be returned or used at a lower grade.

Everyone upstairs has said very insightful things; I’ve also learned from it. Thank you all