The invention relates to a titanium alloy tube and a production method thereof. The steps of the method are as follows: heating in inclined bottom heating furnace → cross rolling perforation → sizing → temperature straightening → primary pickling → cold rolling → annealing → temperature straightening → secondary pickling. The titanium alloy pipe produced by this method has the following characteristics: for the titanium alloy pipe with an outer diameter of 60.32 ~ 88.90mm, the outer diameter tolerance is 0.0mm ~ +0.79mm, and the wall thickness tolerance is greater than or equal to -10%, which can meet the requirements of the design dimension tolerance of titanium alloy tubing; Yield strength 758 ~ 965MPa, tensile strength ≥862MPa, elongation ≥ 11.0%, in line with the performance of 110kSi steel grade.
Titanium alloy pipe is widely used in petroleum and petrochemical industry; Aerospace; Military enterprise products; Nuclear power industry; Pharmaceutical centrifuge, reactor, etc. Titanium alloy has good corrosion resistance, and a uniform and dense oxide film is formed on the surface of titanium in the atmosphere immediately, which has the ability to resist the erosion of a variety of media. Titanium generally has good corrosion resistance in oxidizing and neutral media, especially in sea water, wet chlorine and chloride solutions.
Titanium alloy tube, such as using a skew rolling heating furnace heating punch a rolling tube diameter must be a cooling bed cooling process, by the low temperature (1000 ° c), perforation capillary to mill at the front desk capillary temperature low (is in commonly 850 ~ 900 ° c, left, right), dairy, mandrel life is low, the titanium alloy tube surface defects of dairy, inspection qualified rate is low, It is difficult to repair and grind the inner surface of small titanium alloy.
The round billet made of titanium alloy is heated to 950 ~ 1030°C in the inclined bottom heating furnace, because if the heating temperature is too low, the deformation resistance of titanium alloy increases with the decrease of temperature, which is easy to lead to the load of the punch machine is too high or rolling card, so it needs a higher heating temperature to ensure the stability of the perforation process; On the contrary, if the heating temperature is too high, the plasticity of titanium alloy round billet will decrease, the thickness of the round billet gas layer will increase sharply, and the outer surface defects of the cross rolled perforated capillary are easy to occur. Therefore, considering the above factors, the round billet is heated to 950 ~ 1030°C in the inclined bottom heating furnace, and the holding time is 20 ~ 30min. According to the preferred implementation of the invention, the round billet is heated to a temperature of 970 ~ 1000.
