process for producing corrosion-resistant welded tubes made of titanium alloy.

摘要

A process for manufacturing welded titanium alloy tubes and pipes having good corrosion resistance and good mechanical properties from a titanium alloy which consists essentially, by weight, of one or more of the platinum group metals in a total amount of 0.01 - 0.14%, at least one of Ni and Co each in an amount of 0.1% - 2.0%, not more than 0.35% of oxygen, not more than 0.30% of iron, optionally at least one of Mo, W, and V each in an amount of 0.1% - 2.0%, and a balance of Ti. The process comprises preparing a slab by hot working from an ingot of the titanium alloy after heating in a temperature range of from 750 DEG C to a temperature 200 DEG C above the beta-transus point, hot-rolling the slab with a finishing temperature of not lower than 400 DEG C to form a hot-rolled strip after heating in a temperature range of from 650 DEG C to a temperature 150 DEG C above the beta-transus point, optionally performing annealing in a temperature range of from 550 DEG C to a temperature 20 DEG C above the beta-transus point, and/or cold-rolling followed by such annealing, forming and welding the strip to form a tube or pipe, and optionally heat-treating the welded tube or pipe in a temperature range of from 400 DEG C to a temperature 20 DEG C above the beta-transus point.