Titanium Alloy L- Type Section Bar

Titanium alloy materials have many advantages: low density, lightweight, high specific strength, good low-temperature and high-temperature performance, and excellent corrosion resistance. With the expanding application of titanium and alloys, titanium alloy profiles have been applied in many industries, from spectacles frames and watch covers and chains, to aviation, aerospace, marine, chemical, etc. Titanium alloys are easy to be contaminated by gas elements such as H, O, and N in the production, causing high processing resistance and a narrow range of hot forming temperatures, it is difficult to produce large-sized and variable cross-section profiles, resulting in high production costs.

Currently, China mainly produces some special-shaped materials and variable cross-section titanium alloy profiles through mechanical processing, resulting in huge processing volumes, low metal utilization, and raw material waste. By comparison, the hot extrusion process conducted in a closed extrusion tube has become an advanced method for producing titanium alloy profiles.

At present, the research and production of titanium alloy profiles in China mainly focus on titanium alloy materials such as TA7 (Ti-5Al-2.5Sn), TA15 (Ti-6.5Al-1Mo-1V-2Zr-0.15Si), TC2 (Ti-4Al-1.5Mn), TC4 (Ti-6Al-4V), TC10 (Ti-6Al-6V-2Sn-0.5Cu-0.5Fe), and have been practically applied.

(1) Since the 1970s, China has conducted exploratory research on the hot rolling process and hot extrusion process of titanium and titanium alloy profiles. Compared with foreign countries that had mastered the production technology of hot extruded titanium alloy complex cross-section profiles in the 1960s, China has long mainly focused on the research of simple cross-section titanium alloy section bars such as "L", "T", and "U".

(1) Titanium alloy profiles, as a semi-finished component with near-final shape, have low machining allowance, high structural efficiency, excellent comprehensive performance, and great market potential.

(2) At present, some titanium alloy profiles for civil use in China can be localized, but for aerospace and aviation titanium alloy profiles with strict service conditions, mainly rely on imports and are easily constrained by various conditions. With the rapid development of China's aviation and aerospace industry, it is urgent to establish a stable production process for the mass production of titanium alloy profiles required for key components and to establish unified production standards and quality judgment inspection requirements.

(3) based on mastering the production technology of some simple section titanium alloy profiles, China should focus on researching the lubrication conditions, metal strain state, and flow behavior during hot extrusion deformation of complex section titanium alloy section bars.

(4) Recently, China has been enthusiastic about developing new alloys and expanding new processes in the manufacturing of titanium alloys. However, the continuous exploration of the performance potential of old-brand titanium alloys is insufficient. In the process of product development and upgrading, difficulties will be encountered, and there are also shortcomings in controlling their comprehensive performance.

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