Manufacturing method of cold drawn welded pipe for honing pipe

- Nov 21, 2020-

The present invention belongs to the technical field of steel pipe preparation, and specifically relates to a method for manufacturing cold drawn welded pipes for honing pipes.

In the prior art, the production process of honing pipes generally uses hot-rolled seamless steel pipes, using a combined cutting process of boring and rolling. Since the defect of seamless steel pipes is uneven wall thickness, the main reasons are Uneven heating of the tube billet, instability of the centering roll caused by the uncorrected rolling line of the piercing machine, wear of the plug, eccentricity of the back hole of the plug, incorrect centering hole of the tube billet, excessive bending of the tube billet, etc., need one by one It is difficult to solve all the above-mentioned reasons. Therefore, the yield of seamless steel pipes is relatively low; seamless steel pipes are also prone to defects such as inward folding, internal scarring, warping, internal straightness, internal bulging, and dents. As a result, in the process of subsequent processing into a cylinder, cutting is required. A large amount of metal is cut into chips, which is wasted, and a lot of energy is consumed. The blank of seamless steel pipe is continuously cast, which is prone to blisters. Cause defects in the steel pipe matrix. Moreover, the non-metallic inclusions (mainly sulfides and oxides, and silicates) inside the steel are easily pressed into thin sheets, and delamination occurs, which greatly deteriorates the tensile properties of the steel in the thickness direction. In addition, The precision of seamless steel pipes is difficult to control, and there will be a certain negative difference after cooling. The wider the width of this negative difference, the more obvious the thicker the thickness. Therefore, the edge width, thickness, length, angle, and edge line of seamless steel pipes cannot be too precise. Using this method to manufacture the cylinder body of the hydraulic cylinder has slow production speed, high energy waste, low metal utilization, and low yield.