1results about How to "Improve internal and external surface quality" patented technology

This invention relates to the field of metal pipe manufacturing technology, and discloses a method for manufacturing large-diameter, thin-walled TA31 titanium alloy seamless pipes, comprising the following steps: mixing sponge titanium and an intermediate alloy and then melting to obtain a TA31 ingot; forging the ingot into a titanium billet and processing it into a bright rod; and detecting the β transformation temperature T of the bright rod. β Heat the light bar to T β A thick-walled tube blank is obtained by piercing once at 30-80 ℃; the thick-walled tube blank is then heated to T. β The thin-walled tube blank is obtained by extending and piercing at 20-50 °C. This invention combines a single β-region large-wall-thickness piercing with a single α-β two-phase region large-deformation extension piercing, which can produce tube blanks with superior microstructure and properties, providing good initial conditions for subsequent processing. It not only significantly improves product performance but also has high production efficiency and added value, resulting in good social and economic benefits.