Preparation method of titanium and titanium alloy large-specification seamless pipe

Abstract

The invention provides a preparation method of a titanium and titanium alloy large-specification seamless pipe. According to the preparation method, an electromagnetic casting hollow pipe blank is adopted, a two-roller or three-roller skew rolling process is adopted to conduct cogging on the pipe blank for 2-3 passes, then warm rolling-cold rolling-cold stretching or warm rolling-cold stretching or warm rolling-expanding stretching is conducted, and the stretched pipe is subjected to inspection, fixed-length sawing, surface cleaning and finished product annealing and then is packaged and put in storage. By means of the preparation method, the problems of uneven wall thickness, unstable quality, unsuccessful perforation and the like of a pierced billet in the traditional skew rolling-perforation process are avoided; the process link of repeatedly heating and repeatedly rolling a cast ingot in the traditional process is omitted, so that the heating time is shortened, and oxidation of the pipe blank which sucks air after heating is relieved; annealing and pickling procedures and pickling metal loss are reduced; and large-specification seamless pipes with the diameter ranging from 80mm to 424mm and the wall thickness ranging from 2mm to 30mm can be produced to meet market requirements.

Description

technical field [0001] The invention relates to titanium and titanium processing, and belongs to the technical field of nonferrous metal pressure processing, in particular to a method for preparing large-scale seamless pipes of titanium and titanium alloys. Background technique [0002] Titanium and titanium alloys have outstanding advantages such as high specific strength, corrosion resistance, non-magnetism, low damping, and good high and low temperature performance. They are widely used in aerospace, submarine ships, thermal power nuclear power, ocean engineering, and metallurgy and chemical industries. Large-diameter, thick-walled, seamless titanium alloy pipes are required in the fields of chemical equipment, rocket engine fuel pipelines, submarine shipbuilding, marine engineering, offshore oil, geothermal and deep well natural gas pipelines. [0003] The existing processing methods of titanium and titanium alloy seamless pipes include three kinds of cross-rolling pierc...

AI Technical Summary

Problems solved by technology

The production of titanium and titanium alloy seamless pipes by the existing process has the disadvantages of low production efficiency, long process flow, low utilization rate of raw materials and high production cost.

And the seamless titanium and titanium alloy pipes currently produced and used have small product specifications, the pipe diameter generally does not exceed Ф80mm, and the large-scale, thick-walled, super-long seamless pipes with a diameter of 80mm-424mm and a wall thickness of 3mm-40mm are extremely Difficult to produce and cannot meet the requirements of use

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