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TC4 titanium alloy is one of the most widely used titanium alloys with high strength and good corrosion resistance.

TC4 titanium is mainly made of plate, and TC4 titanium pipe on the market is mainly made of high-strength thick-wall pipe produced by means of hot extrusion or oblique perforation, etc. The warm rolling process needs to improve the traditional roll, that is, induction heating device is installed on the tube rolling machine. This kind of processing equipment has complex structure, tedious process and high production cost.The main reason for the present situation is the high strength of TC4 titanium alloy and the difficulty of cold rolling forming.In order to solve the key technology of TC4 seamless tube cold rolling forming, a series of studies have been carried out by school and enterprise.For example, adopting direct cold rolling forming process to produce high strength titanium alloy tubes can not only greatly reduce the production cost, but also meet the requirements of high performance application of titanium alloy.

The billet is rolled into 70% of the tube by two and three passes respectively.Vacuum annealing was carried out at 800 ° c ×1h between passes. The cooling method was as follows: the furnace was cooled to 500 ° c and the air cooled to room temperature.The conclusion is:

Under the condition of small deformation, the wall thickness deviation is small and the surface roughness is gradually reduced.The wall thickness deviation will affect the wall thickness deviation of the tubes after rolling.

Under the condition of the same total deformation, the more rolling passes, the greater elongation, hardness and strength of the pipe.Good comprehensive performance.

The flow of material is strip when large amount of deformation is rolled, while the flow of material is bundle when small amount of deformation is rolled.

Small amount of deformation has little effect on the anisotropy of the pipe.The anisotropy of mechanical properties in multi-pass rolling has a certain fluctuation.

Editor : Carrie Qi (rowlynti@rowlyn.com)