Heat Treatment Technology for Oil Casing Pipe

Heat treatment methods for oil casing pipe

Oil casing pipe can effectively improve its impact resistance, tensile strength, and destructive performance through heat treatment, ensuring good value in use.

Oil casing pipe is an essential pipe material for drilling oil and gas, requiring good performance during use. Different temperature controls are chosen for different temperature ranges of the oil casing. Heating is produced according to a certain temperature. AC1=736℃, AC3=810℃ for 27MnCrV steel. After quenching, the tempering temperature is selected at 630℃, and the holding time is 50 minutes. For subcritical quenching, the heating temperature is selected between 740-810℃.

The heating temperature for subcritical quenching is 780℃, and the holding time for quenching heating is 15 minutes. As subcritical quenching is heated in the α+γ dual-phase zone where partial undissolved ferrite is quenched, the toughness increases while maintaining high strength.

Strict implementation of heat treatment for oil casing pipe

To ensure the production of high-quality and high-performance oil casing pipe, it is necessary to adhere to higher strength and toughness while performing heat treatment in different ways.

Meanwhile, low-temperature quenching is lower than conventional temperature, reducing quenching stress and deformation, which ensures smooth operation of heat treatment production for oil casing pipe and provides good raw materials for subsequent threading.

Currently, this process has been applied to different pipe processing plants with quality assurance data showing that the tensile strength of steel pipes after heat treatment is Rm910-940MPa, the yield strength is Rt0.6820-860MPa, and the destructive performance is 100% qualified. The impact toughness is Akv65-85J. Data shows that 27MnCrV steel pipe is already a high-quality oil casing pipe. On the other hand, it also demonstrates that subcritical quenching technology is an excellent method to avoid high-temperature brittleness in steel product production.

With the continuous development and growth of the company in recent years, many types of water well mud pumps, mud pumps, grout pumps, and cement grout pumps have been developed. They are widely used in water well drilling, mining, geological drilling, coal mining, railways, highways, water conservancy and hydropower, bridges, high-rise buildings, foundation reinforcement engineering, non-excavation, oil, natural gas, shale gas, and other industries.

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