A method for the production of corrosion-resistant seamless tubes made from titanium alloy.

摘要

PURPOSE:To produce a highly corrosion resistant seamless Ti alloy tube having high quality without deteriorating chemical and mechanical properties by using, as a stock, a titanium alloy which has a composition containing relatively small amounts of one or more platinum group elements, and also containing proper amounts of Ni or/and Co, etc. CONSTITUTION:A stock of an alloy having a composition consisting of 0.01-0.14%, in total, of one or =2 kinds among platinum group elements, either or both of 0.1-2.0% each of Ni and Co, =0.35% oxygen, =0.30% iron, and the balance essentially Ti is heated in a temp. region from 650 deg.C to (beta-transformation point + 100 deg.C) and formed into a billet by means of hot working. This billet is heated from 600 deg.C up to (beta-transformation point + 50 deg.C) by using an electric furnace, an electric induction furnace, a gas or fuel oil fired furnace, etc. After heating the billet, a glass lubricant is applied to the outside surface, the inside surface, and the front (the end face at the time of inserting into a press) of the billet, and this billet is put into a horizontal press and extruded into tubular state, followed by annealing at 500-850 deg.C.