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Tubing is a pipeline that transports crude oil and natural gas from an oil and gas layer to the surface after drilling is completed, and it is used to withstand the pressure generated during the extraction process.

Quilted pipe is a kind of high-precision steel pipe material after cold drawing or hot rolling. Because the inner and outer walls of precision steel pipes have no oxide layer, withstand high pressure without leakage, high precision, high finish, cold bending without deformation, flaring, flattening without cracks, etc., so it is mainly used to produce pneumatic or hydraulic components, such as cylinders or cylinders, can be seamless pipes. The chemical composition of quilted pipe is carbon C, silicon Si, manganese Mn, sulfur S, phosphorus P, chromium Cr.

The cylinder tube adopts rolling processing, which helps to close the surface microcracks and hinders the expansion of erosion due to the residual compressive stress left on the surface layer. This improves the surface corrosion resistance and delays the generation or expansion of fatigue cracks, thereby improving the fatigue strength of the quilted tube. Through roll forming, a cold work hardening layer is formed on the rolling surface, which reduces the elastic and plastic deformation of the contact surface of the grinding pair, thereby improving the wear resistance of the inner wall of the quilted tube and avoiding burns caused by grinding. After rolling, the surface roughness value decreases, which can improve the mating properties.

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