Seamlless carbon steel pipe is an important type of steel pipe in production and life. It is an important steel that is relatively strong and durable among steel pipes. Carbon steel seamless pipes will also encounter bending deformation in use. When the bending and deformation of Carbon steel seamless pipes are encountered, as long as the Carbon steel seamless pipes can be corrected, the Carbon steel seamless pipes can continue to be used, otherwise the Carbon steel seamless pipes will be There are effects of use.
Control the bending degree of seamless pipe during quenching, which can be carried out from the following aspects:
①Adopt a step-by-step cooling process of first spraying outside and then spraying inside. Since the internal water spray of the Carbon steel seamless pipe flows from one end of the Carbon steel seamless pipe to the other end, the cooling rate of the Carbon steel seamless pipe at both ends is different, which causes the Carbon steel seamless pipe to bend. Therefore, the external spray water cooling can be used first, so that the surface layer of the Carbon steel seamless pipe will undergo structural transformation first, and then the internal spray water cooling method can be used to avoid the bending distortion of the Carbon steel seamless pipe. ~10s.
②Reduce the length of the overhanging end of the Carbon steel seamless pipe on the rotating wheel. Through reasonable rotating wheel layout and seamless steel tube length control, the overhang of the seamless steel tube end is controlled to ≤600 mm, which can effectively reduce the centrifugal force during quenching and reduce the bending degree of the seamless steel tube end.
③Reasonably control the rotation speed of the rotating wheel.
④Control the center of the water quenching rotating wheel. The deviation of the center of the rotating wheel has a great influence on the curvature of the Carbon steel seamless pipe during quenching. After research, the center range of the rotating wheel should be controlled within 0 ~ 5 mm.
⑤Control the amount and uniformity of internal and external spray water. When oil well pipe quenching and cooling adopts outer surface laminar cooling and internal axial spray, the size and uniformity of the external water spray, the internal water spray and the centering degree of the internal nozzle are also An important factor influencing the curvature of Carbon steel seamless pipes during water quenching.