GR5 titanium alloy is one of the most widely used titanium alloys. This grade of titanium alloy has high strength and good corrosion resistance. However, GR5's 64Ti seamless titanium tube is not common in the seamless titanium tube market at home and abroad.

GR5 titanium material is mainly made of sheet material, and GR5 titanium pipes on the market are mainly used to produce high-strength thick-walled pipes by hot extrusion or diagonal pull perforation. This kind of hot rolling process needs to improve the traditional roll, namely install induction heating device on the tube rolling mill. The processing equipment has a complicated structure, a complicated process and high production cost. This situation is mainly caused by the high strength of GR5 titanium alloy and the difficulty of cold rolling. In order to solve the key technology of GR5 seamless tube cold-rolling forming, for example, the direct cold-rolling process can not only greatly reduce the production cost, but also meet the requirements of high-performance titanium alloy applications.

The billeting method with different deformations is adopted, and the tube blank is rolled into a tube with a total deformation of 70% after two and three passes respectively. Carry out 800℃×1h vacuum annealing between passes. The cooling method is furnace cooling to 500℃ and then air cooling to room temperature to observe the changes in structure and properties.

In the case of billeting with small deformation, the wall thickness deviation is small and the surface length gradually decreases; for billeting with large deformation, the wall thickness deviation is large, which will affect the wall thickness deviation of the pipes obtained by subsequent passes.

When the total deformation is the same, the more rolling passes, the elongation, hardness, and strength of the pipe. Good overall performance.

When rolling with large deformation, the flow of material is strip-shaped, and when rolling with small deformation, the flow of material is bundled. Under the condition that the heat treatment conditions between passes are the same as the subsequent rolling process, the tube with large deformation is billeted The tissue distortion is more serious.

The small deformation billet has little effect on the carbonization of the pipe; there is a certain deviation in the mechanical properties in the multi-pass rolling

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