Commonly used heat treatment methods for
titanium tubes include annealing, solution and aging treatment. Annealing is to eliminate internal stress, improve plasticity and organizational stability, and obtain better comprehensive properties.
The heat treatment process of titanium tube can be summarized as:
(1) Solution treatment and aging: The purpose is to improve its strength. Alpha titanium tubes and stable beta titanium tubes cannot be subjected to strengthening heat treatment, and only annealing is carried out in production. α+β titanium tubes and metastable β titanium tubes containing a small amount of α phase can be further strengthened by solution treatment and aging.
(2) Complete annealing: the purpose is to obtain good toughness, improve processing properties, facilitate reprocessing and improve the stability of size and structure.
(3) Stress relief annealing: The purpose is to eliminate or reduce the residual stress generated during processing. Prevent chemical attack and reduce deformation in some corrosive environments.
In addition, in order to meet the special requirements of the workpiece, industrial titanium tubes also adopt metal heat treatment processes such as double annealing, isothermal annealing, beta heat treatment, and deformation heat treatment.
Titanium tubes are mainly used to make aircraft engine compressor parts, followed by structural parts of rockets, missiles and high-speed aircraft. In the mid-1960s, titanium and its alloys have been used in general industry for making electrodes in the electrolysis industry, condensers in power stations, heaters in petroleum refining and seawater desalination, and environmental pollution control devices. Titanium and its alloys have become a corrosion-resistant structural material. In addition, it is also used in the production of hydrogen storage materials and shape memory alloys.
Titanium tube has high strength and low density, good mechanical properties, good toughness and corrosion resistance. In addition, the process performance of titanium tube is poor, cutting is difficult, and it is very easy to absorb impurities such as hydrogen, oxygen, nitrogen and carbon during hot processing. There is also poor wear resistance and complex production process.
