The technology development of titanium tube for cold rolling
TC4 titanium alloy is one of the most widely used titanium alloy, its strength is high, the corrosion resistance is good, however, at present, it's difficult to see TC4 material seamless titanium tube in domestic and foreign seamless titanium tube market.
The plate material is the main material of TC4 titanium material, TC4 titanium tube is mainly the thick wall tube with high strength produced by hot extrusion or oblique perforation method, the warm rolling process needs to improve the traditional roller, namely the heating device should be installed in the rolling tube machine, and the processing equipments have complex structure, cumbersome process and high production cost and other feathers. The main cause of this situation is that the strength of TC4 titanium alloy is high, and the difficulty of cold rolling is high. In order to solve the key technology of TC4 seamless tube cold rolling, a series of research is carried out. For example, high strength titanium alloy tube produced by direct cold rolling not only can greatly reduce the production cost, but also meet the requirements of high performance application for titanium alloy.
It adopts different ways of opening blanks, the tube blank is rolled into the tube materials with 70%of the total deformation through respectively two pass and three pass rolling. he 800℃×1h vacuum annealing were performed among the passes, and the coding measure is that you can observe the microstructure and properties after the furnace cooling to 500℃ and then air cooling to the room temperature. The conclusion is: in the situation of small deformation bloom, the wall thickness deviation is smaller, surface roughness decreased gradually; cogging deformation, the wall thickness deviation will larger, which will affect the wall thickness deviation of pipe materials by subsequent rolling.
The plate material is the main material of TC4 titanium material, TC4 titanium tube is mainly the thick wall tube with high strength produced by hot extrusion or oblique perforation method, the warm rolling process needs to improve the traditional roller, namely the heating device should be installed in the rolling tube machine, and the processing equipments have complex structure, cumbersome process and high production cost and other feathers. The main cause of this situation is that the strength of TC4 titanium alloy is high, and the difficulty of cold rolling is high. In order to solve the key technology of TC4 seamless tube cold rolling, a series of research is carried out. For example, high strength titanium alloy tube produced by direct cold rolling not only can greatly reduce the production cost, but also meet the requirements of high performance application for titanium alloy.
It adopts different ways of opening blanks, the tube blank is rolled into the tube materials with 70%of the total deformation through respectively two pass and three pass rolling. he 800℃×1h vacuum annealing were performed among the passes, and the coding measure is that you can observe the microstructure and properties after the furnace cooling to 500℃ and then air cooling to the room temperature. The conclusion is: in the situation of small deformation bloom, the wall thickness deviation is smaller, surface roughness decreased gradually; cogging deformation, the wall thickness deviation will larger, which will affect the wall thickness deviation of pipe materials by subsequent rolling.
