High-frequency induction seamless special-shaped titanium welded pipe and production method

Abstract

The invention relates to the field of seamless special-shaped titanium welded pipes, in particular to a high-frequency induction seamless special-shaped titanium welded pipe and a production method thereof, which are characterized in that a mother pipe is subjected to first-pass straight-drawing cold-drawing hole shrinkage, second-pass special-shaped pipe pre-forming straight-drawing cold-drawing and heat treatment, and then subjected to third-pass special-shaped pipe fine-forming straight-drawing cold-drawing to obtain the high-frequency induction seamless special-shaped titanium welded pipe. And finally, the inner core is hydraulically shaped. The seamless special-shaped titanium welded pipe produced through the method is very uniform in wall thickness and outer diameter, the size precision is + / -0.03 mm to 0.05 mm, the process route that the thin-wall seamless special-shaped titanium pipe is directly prepared from the raw material strip coil through welding and cold drawing is achieved, and the production cost is greatly reduced.

Description

technical field [0001] The invention relates to the field of seamless special-shaped titanium welded pipes, in particular to a high-frequency induction seamless special-shaped titanium welded pipe and a production method thereof. Background technique [0002] At present, titanium tubes can only produce round tubes (seamless tubes and fusion welded tubes). Due to the characteristics of the seamless rolling process, special-shaped titanium tubes cannot be produced by rolling. Due to the low precision of the fusion welding process, there is still a lower limit for the thinnest wall thickness when welding titanium tubes. The high temperature causes the weld zone and the heat-affected zone to be too wide, and there is a large difference between the metallographic microstructure and the base metal, so it cannot be directly made into a seamless profile by welding. Titanium welded pipe. The production of special-shaped tubes by cold drawing process, the cost of choosing thin-walle...

AI Technical Summary

Problems solved by technology

Due to the characteristics of the seamless rolling process, special-shaped titanium tubes cannot be produced by rolling

Due to the low precision of the fusion welding process, there is still a lower limit for the thinnest wall thickness when welding titanium tubes. The high temperature causes the weld zone and the heat-affected zone to be too wide, and there is a large difference between the metallographic microstructure and the base metal, so it cannot be directly made into a seamless profile by welding. Titanium welded pipe

The production of special-shaped tubes by cold drawing process, the cost of choosing thin-walled seamless titanium tubes is too high, and the fusion-welded titanium tubes also need to be annealed and cold-rolled to make the weld seam and heat-affected zone consistent with the metallographic structure of the base metal, and the cost is also not low. Moreover, the production of special-shaped titanium tubes is still subject to various restrictions such as deformation, symmetry, extubation medium, and mold opening accuracy, and there are few successful cases.

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