In addition to being used for oil exploration, the appearance of
oil casing can also be used as a pipeline for transporting raw materials. To enhance the quality of
oil casing, every link in the production process is particularly important, especially the temperature control during the period, which must be strictly followed. Regulations to master. Under normal circumstances, the sub-temperature quenching method is used for the
oil casing, instead of the ordinary quenching method, because the ordinary quenching method will cause a large amount of residual stress inside the workpiece, thereby expanding the brittleness, and the 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 of 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 selected at 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 has been 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 on the results of heat treatment. Therefore, all manufacturers have very strict requirements for the process of heat treatment, and they dare not be neglected. Sometimes it can also 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 can process the
oil casing into raw materials more suitable for the later process. Therefore, the current achievements of
petroleum casing are inseparable from heat treatment. Since the processing of heat treatment, the impact toughness, damage resistance, and tensile strength of
petroleum casing have been greatly improved. improve.
