Finishing method of titanium alloy seamless pipe

Abstract

The invention relates to a titanium alloy seamless pipe finishing method, and belongs to the technical field of titanium alloy seamless pipe. The invention aims to provide a method for finishing titanium alloy seamless pipe. The method comprises the following steps in sequence: step a, heat treatment: filling a titanium alloy seamless pipe with aluminum silicate fibers, and then carrying out a heat treatment, wherein the heat treatment temperature is 700 to 930 DEG C, and the residual oxygen content in the heat treatment furnace is controlled at 3% or less; step b, primary straightening: straightening the titanium alloy seamless pipe at a temperature of 500 to 600 DEG C for the first time, and then cooling to the room temperature; step c, secondary straightening: straightening the titanium alloy seamless pipe at a room temperature for a second time, and then washing the pipe with acid so as to obtain the titanium alloy seamless pipe. The provided finishing method can adjust the flexibility of a titanium alloy seamless pipe, at the same time the oxide scale on the surface of the titanium alloy seamless pipe is removed, the technology is simplified, the titanium metal consumption is reduced, and the effect on removing the oxide scale on the inner / outer surfaces of a titanium alloy seamless pipe is better.

Description

technical field [0001] The invention relates to a finishing method for a titanium alloy seamless pipe, and belongs to the technical field of the titanium alloy seamless pipe. Background technique [0002] Due to its low density, high strength and good corrosion resistance, titanium is widely used in petroleum, chemical industry, coastal power station and seawater desalination and other fields. In recent years, the requirements for titanium seamless pipes required in these fields have become higher and higher, and the strength of the required pipes has increased, making the pipes develop from pure titanium to titanium alloys. Usually, after the titanium alloy seamless pipe is rolled, it needs to be straightened to make the product have a conforming shape and reduce its curvature. In addition, after hot rolling or heat treatment of the titanium alloy seamless pipe, an oxide layer will be formed on the inner and outer surfaces, and the finished titanium alloy seamless pipe req...

AI Technical Summary

Problems solved by technology

These methods all have the defect of large loss of titanium metal. In addition, the effect of removing the oxide layer by sand blasting + pickling method is uneven, which will cause the oxide layer to be removed in some places, but not removed in some places, which will affect the performance of the product. ; The method of grinding wheel grinding + pickling has a good removal effect, but the loss of titanium metal is greater

It can be seen that the existing process for removing the oxide layer on the surface of titanium alloy seamless pipe has shortcomings such as poor effect and high loss of titanium metal.

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