Recently, “titanium alloy hot rolled seamless tube production technology” technology project through the evaluation of scientific and technological achievements. The technology is mainly aimed at improving the traditional hot rolling process of seamless steel tubes, and transplanted to the production of titanium seamless tubes. Compared with the traditional process of “extrusion forming, bar drilling and boring, cold rolling and cold drawing after oblique rolling perforation”, the tube yield is significantly increased, up to 97%.
Through the characteristics of titanium alloy pipe, the project has carried out targeted improvement in the production process and method, and installed insulation tunnel and fast transfer device in the main motor power, which are innovative to some extent, and can produce large titanium alloy pipe with a diameter of 273mm and a length of 12m.
Titanium and titanium alloy pipe cutting should be mechanical method, cutting speed should be low speed is appropriate; Titanium pipe grinding wheel cutting or grinding, should use special grinding wheel; Do not use flame cutting. The groove should be machined by mechanical method. Titanium alloy processing welding should be inert gas welding or vacuum welding, can not use oxygen – acetylene welding or carbon dioxide gas welding, also can not use ordinary manual arc welding. Titanium and titanium alloy pipes shall not be installed with iron tools and materials percussion and extrusion; Rubber plate or soft plastic plate should be padded between carbon steel support, hanger and titanium and titanium alloy pipeline, so that it is not in direct contact with titanium and titanium alloy pipeline.
The titanium and titanium alloy pipes shall be equipped with bushing when they pass through the wall and floor, the gap shall not be less than 10mm, and the insulation shall be filled, and the insulation shall not contain iron impurities. Titanium pipe is not suitable for direct welding and connection with other metal pipes. When a connection is required, a looper flange connection can be used. The non-metallic gasket used is generally rubber or plastic gasket, and the chloride content should not exceed 25ppm.
Post time: Aug-31-2022