Significance of oil casing heat treatment process

In addition to being used for oil extraction, the emergence of oil casing can also be used as a pipeline for transporting raw materials. To enhance the quality of the oil casing, every link in the production process is particularly important, especially the temperature control during the period must be strictly by Regulations mastery. Usually, oil casing adopts the sub-temperature quenching method instead of the ordinary quenching method, because after the ordinary quenching method is adopted, there will be a large amount of residual stress inside the workpiece, thereby expanding the brittleness, and subsequent processing is not so convenient. The sub-temperature quenching is to prevent the excessive brittleness of the oil casing from affecting the subsequent process. The main operation method is to first select the heating temperature for sub-temperature quenching, usually between 740-810°C, and the heating time is generally about 15 minutes. After quenching, tempering is carried out. The heating time for tempering is 50 minutes, and the temperature should be 630°C. Of course, each steel has its heating temperature and time during heat treatment. As long as the performance of the workpiece can be improved and improved, then heat treatment The purpose is achieved.

Heat treatment is the most important process in the processing of petroleum casing. Whether the performance and quality of the finished product can meet the standard depends mostly on the result of heat treatment. Therefore, all manufacturers have very strict requirements for the heat treatment process and dare not neglect it. Sometimes it can be quenched by low-temperature quenching. Low-temperature quenching can effectively remove the residual stress of the oil casing, which not only reduces the degree of deformation of the workpiece after quenching but also processes the oil casing into raw materials that are more suitable for later processes. Therefore, the current achievements of oil casing are inseparable from heat treatment. Since the processing of heat treatment, whether it is the impact toughness, anti-destruction performance, or tensile strength of oil casing, there has been a great improvement. improve.