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Cold rolling forming technology of TC4 titanium alloy seamless tube

Titanium alloy has excellent corrosion resistance, low density, good fatigue strength and crack

resistance, and has broad application prospects in the fields of aviation, aerospace, automobile,

shipbuilding, energy and so on. Titanium excellent corrosion resistance and good specific strength, so that

the titanium tubethan other traditional titanium metal pipe fittings produced more thin, better heat transfer

 effect. TC4 titanium alloy is one of the most widely used titanium alloys. It has high strength and good

 corrosion resistance, but it is difficult to see seamless titanium tube of TC4 material at home and

abroad. TC4 titanium plate mainly dominated, market of TC4 tube with hot extrusion or oblique perforation 

method for the production of high strength thick wall tube based, Baoji Nonferrous Metal processing factory

 of sheep Yulan et al study of temperature and rolling method for manufacturing TC4 titanium alloy mill 

products, the warm rolling process needs to improve the traditional roll, namely in rolling tube machine on

 the installation of induction heating device, the structure of the processing equipment is complex,

 cumbersome process, the cost of production. The main reason for this situation is that the strength of TC4

 titanium alloy is high, and the forming of cold rolling is very difficult. In order to solve the key 

technology of TC4 seamless tube cold rolling, a series of studies were carried out. Such as the production

 of high strength  titanium alloy pipe  by direct cold rolling process, not only greatly reduce the

 cost of production, but also meet the requirements of high performance applications of titanium alloy.

The tube blank is rolled into a tube with a total deformation amount of 70% by two pass and three pass 

rolling, respectively. During the process of 800 c * 1H vacuum annealing, the cooling method for the furnace cooling to 500 degrees after the air cooled to room temperature, observe the change of its structure and performance. The conclusion is that:

Under the condition of small deformation, the wall thickness deviation is small, the surface roughness is gradually reduced, the large deformation of the blank, the wall thickness deviation is large, it will affect the wall thickness deviation of the tube.

In the case of the same total deformation, the number of rolling passes, the greater the elongation and hardness, the higher the strength. Good comprehensive performance.

Large rolling deformation when the material flow banded, small deformation the material flow bundles, in the road between the same heat treatment conditions and the subsequent rolling process, the large amount of deformation on billet obtained tube distortion more serious.

The small deformation has little effect on the anisotropy of the tube, and the anisotropy of the mechanical properties in the multi pass rolling has a certain fluctuation.

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