The most commonly used in the process of oil drilling is the API oil casing supplied by Hunan Great Steel Pipe Co., Ltd. It is also used in conjunction with drill pipes, drill collars, core pipes, and small-diameter drilling steel pipes. The main function of API oil casing is to support the oil well wall during the entire drilling process and after completion, which can ensure the normal operation of the entire oil well.

The API oil casing pipe supplied by Hunan Great Steel Pipe Co., Ltd is a kind of pipeline that transports petroleum and other raw materials. The technical requirements for the API oil casing pipe supplied by Hunan Great Steel Pipe Co., Ltd are also quite strict. Among them, the most stringent requirement is temperature, which requires a corresponding temperature in each processing stage. For example, the AC1 of 27MnCrV steel corresponds to a temperature of 736 degrees Celsius. The heating temperature should be controlled between 740-810 degrees Celsius during sub-temperature quenching. Ensure that the sub-temperature quenching temperature is 780 degrees, and the heating time is more than 15 minutes; the squandering temperature of the API oil casing supplied by Hunan Great Steel Pipe Co., Ltd after quenching should be controlled at 630 degrees, and tempering should be controlled. The time should be above 50 minutes. If you want to improve the toughness of the API oil casing, the heating temperature should be controlled between α + γ, and it is required to quench the API oil casing while retaining part of the dissolved ferrite. Therefore, API oil casing is heat-treated by sub-temperature quenching, which can better improve the tensile strength of API oil casing, and improve the impact toughness and damage resistance of API oil casing.

Strict control should be carried out during the heat treatment of API oil casing pipe supplied by Hunan Great Steel Pipe Co., Ltd. Only in this way can the quality of the API oil casing pipe supplied by Hunan Great Steel Pipe Co., Ltd be guaranteed. It has super toughness and other performance during use. The API oil casing supplied by Hunan Great Steel Pipe Co., Ltd adopts a cryogenic quenching processing method to reduce the stress change during quenching. Generally, the temperature of such cryogenic quenching is lower than normal temperature, so it is not easy to cause Hunan during quenching. The deformation of API oil casing supplied by Great Steel Pipe Co., Ltd. Using this treatment method can not only ensure normal production but also provide raw materials for subsequent wire processing.