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Production process of niobium titanium capillary tube

The production process of niobium titanium capillary tube mainly includes the following key steps:
1. Extrusion to make tube billet
The titanium-niobium alloy ingot is prepared by vacuum consumable arc melting method. After forging and blanking, the round ingot is extruded into tube billet on the extruder. The diameter of the tube billet is generally 60-90mm and the wall thickness is 10-30mm.

2. Rolling and shrinking
The tube billet is rolled and reduced twice by a three-roll planetary rolling mill. During rolling, the tube billet is induction heated online. The temperature is generally controlled at 800-1000℃. The first rolling reduces the diameter of the tube billet to 30-40mm, and the second rolling reduces the diameter to 12-15mm, and the wall thickness is correspondingly thinned.

3. Rolling and shrinking again
The tube billet is further rolled to a smaller diameter (such as 5-6mm) by a three-roll finishing tube mill. The deformation rate of a single pass is about 30% or more. Vacuum annealing is required many times during the process to eliminate internal stress and restore the structure.

4. Drawing forming
The rolled tube blank is drawn into the final capillary tube using a precision tube drawing machine, with a diameter of 1-3mm and a wall thickness of 0.1-0.3mm. A carbon fiber rod is used as the mandrel during drawing. Multiple vacuum annealing is also required during the drawing process to ensure the mechanical properties and dimensional accuracy of the tube. This process ensures that the niobium-titanium capillary tube has high strength, low elastic modulus, high ductility and good biocompatibility, which is suitable for medical and high-end industrial applications.