Method for hot rolling of large-opening-diameter titanium and titanium alloy thin-wall seamless pipe through jacket core bar

Abstract

The invention discloses a method for hot rolling of a large-opening-diameter titanium and titanium alloy thin-wall seamless pipe through a jacket core bar. According to the method, a vacuum self-consuming arc furnace is used for secondary smelting to form a casting ingot; the casting ingot is subject to two-heating-number forging to form the bar; scaling machining is carried out; three-roller (or two-roller) skew rolling punching is used for making a seamless pipe blank; for pipe materials with the special property needs, the pipe blank subject to sand blasting, acid pickling, polishing and grinding and the like is subject to further cold rolling and other deep machining, a finished product pipe with the more excellent property is obtained, the pipe is subject to acid pickling treatment, and the large-opening-diameter thin-wall seamless pipe is obtained; finally, the finished product pipe is subject to vacuum annealing treatment and polishing fixed-size packaging. The large-opening-diameter thin-wall titanium and alloy seamless pipe manufactured through the method is excellent in mechanical property, the method is mainly used for fields of pressure containers, industrial pipelines, condensers, well drilling parts and the like in the industries of petroleum, chemical engineering, ocean and the like, and the needs of the anti-corrosion pipe can be met.

Description

technical field [0001] The invention relates to the field of metal products, in particular to a method for manufacturing large-caliber titanium and titanium alloy thin-walled seamless pipes. Background technique [0002] As a metal material, although titanium is not as early known as copper, iron, and aluminum, it has the advantages of high specific strength, good corrosion resistance, and non-magnetic properties. Due to their excellent comprehensive mechanical properties, titanium and titanium alloys have been widely used in aerospace, shipbuilding, chemical industry, transportation vehicles, architectural decoration, marine architecture, sporting goods, daily necessities, etc. Metal”, “Ocean Metal”, “Smart Metal”, etc. [0003] The 1950s was the pioneering period of my country's titanium production, the 60s to 70s was the construction period, and the 80s to 90s was the initial development period. In the new century, thanks to the sustained and rapid development of the na...

AI Technical Summary

Problems solved by technology

[0004] There are currently two types of processing methods for large-diameter thin-walled pipes of titanium and titanium alloys: one is to use plates, molded by a plate rolling machine or a hydraulic press, and then welded into round pipes, which are rounded and straightened to make seams. Welded pipes; the other type is made by boring large-diameter hollow thick-walled seamless pipes (or using super-large pipe rolling machines), because it is difficult to directly obtain thin-walled pipes with large diameter-to-thickness ratios by hot perforation seamless pipe

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