Aerospace-Aero Titanium Industry Inc (Aero Ti. US)-Aero Titanium Industry Inc (Aero Ti. US)

Titanium Alloys for Aircraft Structures

Titanium alloys for aircraft structures are mainly used in aircraft frames, hatches, hydraulic pipelines and joints, landing gear, skins, rivets, hatches, spars, etc. In the 1950s, the United States first used titanium alloys on the F-84 bomber as non-load-bearing components such as rear fuselage heat shields, wind deflectors, and tail covers. Since the 1960s, the use of titanium alloys in military aircraft has increased rapidly, accounting for 20% to 25% of the weight of the aircraft structure. Important load-bearing components such as flap slide rails.
Since the 1970s, civil aircraft have also begun to use a large number of titanium alloys. For example, the amount of titanium alloy used in Boeing B747 passenger aircraft is more than 3640kg. The service temperature of titanium alloys used in aircraft structures is generally not higher than 350°C, and it has higher requirements in terms of specific strength, toughness, fatigue resistance, and welding process performance. Titanium alloys widely used in aircraft fuselage include β-21S (Ti-15Mo-3Al2.7Nb-0.2Si), Ti-10-2-3 (Ti-10V-2Fe-3Al), Ti-15-3 (Ti-15V-3Cr-3Al-3Sn)[67], Ti-3Al-8V-6Cr-4Mo-4Zr, etc.

Titanium Grade9 Tube/Pipe for Aerospace Application

Titanium Grade9 (Ti-3Al-2.5V) has 20-50% higher strength than pure titanium at room temperature and high temperature. It not only has good room temperature and high temperature mechanical properties and corrosion resistance, but also has excellent cold and hot processing plasticity formability and weldability. The alloy is not sensitive to notches and has good corrosion resistance, making it the material of choice for aerospace piping systems.
The strengthening method of titanium grade9 is mainly through cold working deformation. After cold working, different heat treatment systems can make the pipes reach different strength levels. The most commonly used are the two typical representatives of the medium strength grade in the annealed state (Rp0.2≥620MPa) and the high strength grade in the stress-relieved annealed state (Rp0.2≥860MPa). Among them, the medium-strength pipes in the annealed state are mainly used in engine piping systems, and the high-strength pipes in the stress relieved annealed state are mainly used in piping systems such as aircraft hydraulic pressure.
Titanium Grade9 is used in hydraulic piping systems, which can not only meet high strength requirements, but also meet the needs of aerospace and other fields for lightweight components, so it has long been valued and widely used abroad. In the middle of the 20th century, the United States developed titanium grade9 pipes for aircraft pipeline hydraulic systems, which have been used in F-14A, F-15, B-1 and Boeing 747, 757, 767 and other aircraft. Promote and apply in hydraulic and fuel pipeline systems. At present, Titanium Grade9 has been widely used in pipe fittings in military engineering (including helicopters), and has become the material of choice for military and civil aircraft piping systems.