TC4 titanium alloy seamless tube and production method thereof

Abstract

The invention provides a TC4 titanium alloy seamless tube and a production method thereof. The method comprises the steps of heating a round billet of a TC4 titanium alloy to 920-980 DEG C; conducting on-line hot centering on the round billet; conducting cross piercing, wherein controlling the total diameter reduction rate to be 9-16%, controlling the before-head reduction rate to be 2.5-11%, controlling the ovality coefficient to be 1.13-1.20, and controlling the punching rate to be 0.2-0.5m / s; conducting precise skew rolling to form a pierced billet, enabling the total diameter reduction rate to be 12-18%, enabling the ovality coefficient to be 1.08-1.15, enabling the tube rolling rate to be 0.3-0.4m / s; controlling the temperature of the pierced billet to be 860-940 DEG C, sizing and conducting air cooling to obtain the TC4 titanium alloy seamless tube. By means of the production method, the TC4 titanium alloy seamless tube with the excellent mechanical property can be obtained, production efficiency is high, mass production can be achieved, and the yield can reach 90% and more.

Description

technical field [0001] The invention belongs to the technical field of production of titanium alloy seamless pipes, and specifically relates to a TC4 titanium alloy seamless pipe and a production method thereof. Background technique [0002] Generally speaking, the performance of TC4 alloy is mature and stable, and it is the most widely used titanium alloy at present, accounting for more than 60% of the amount of titanium alloy. The production methods of TC4 titanium alloy seamless pipe mainly include extrusion molding, bar drilling and boring, and cold rolling and cold drawing after skew rolling and piercing. The extrusion molding production method has low yield, poor dimensional accuracy, and high production cost; the production method of bar drilling and boring has better dimensional accuracy, but the processing cost is high and the yield is low, especially for large-diameter thin-walled pipes; skew rolling piercing Although the production method of post-cold rolling and...

AI Technical Summary

Problems solved by technology

The extrusion molding production method has low yield, poor dimensional accuracy, and high production cost; the production method of bar drilling and boring has better dimensional accuracy, but the processing cost is high and the yield is low, especially for large-diameter thin-walled pipes; skew rolling piercing Although the production method of post-cold rolling and cold drawing has a high yield, the alloy has high strength and poor plasticity at room temperature, and the deformation resistance of cold rolling and cold drawing is large, requiring multiple passes of repeated annealing, resulting in low production efficiency and high production costs.

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