Heat treatment is the most important process in the processing of oil casing. Whether the performance and quality of the finished product can meet the standard depends mostly on the results of heat treatment. Therefore, various manufacturers have very strict requirements on the heat treatment process and dare not be negligent. Sometimes it can also be quenched by low-temperature quenching. Low-temperature quenching can effectively remove the residual stress of the petroleum casing, not only reduces the degree of deformation of the workpiece after quenching but also can process the petroleum casing into a more suitable raw material for the later process. Therefore, the current achievements of oil casing pipes are inseparable from heat treatment. Since the process of heat treatment, whether it is impact toughness, damage resistance, or tensile strength of oil casing pipes, they have greatly improved.