Titanium is developed in the 1950s as an important structural metals, titanium alloys due to high strength, good corrosion resistance, high heat resistance characteristics are widely used in various fields.
At moderate temperatures which can maintain the required strength, the temperature of 450 ~ 500 ℃ long-term work. Titanium in the humid atmosphere and seawater media work, which is far superior corrosion resistance of stainless steel; the pitting, etching, particularly strong resistance to stress corrosion; alkali, chloride, chlorine, organic materials, nitric acid, sulfuric acid etc. have excellent corrosion resistance. However, with the reduction of titanium oxide and chromium salts medium, poor corrosion resistance.
Titanium alloys at low and ultra-low temperatures, can still maintain its mechanical properties. Low temperature performance, low interstitial elements titanium, titanium is also an important temperature structural materials.
Titanium has a high strength and density and small, good mechanical properties, toughness and good corrosion resistance. In addition, the titanium process performance cutting processing difficulties in the thermal processing, is easy to absorb carbon hydrogen nitrogen and other impurities. There abrasion resistance is poor, complex production process. The density of titanium is generally 4.51g / cc or so units can be made out of high strength, rigidity, lightweight components. Currently aircraft engine components, skeleton, skin, so the use of titanium fasteners and landing gear. Development needs of the aviation industry, the titanium industry with an average annual growth rate of about 8% develop. World titanium alloy production reached 40,000 tons, nearly 30 kinds of titanium alloys. The most widely used titanium alloy is Ti-6Al-4V (TC4) and commercially pure titanium (TA1, TA2 and TA3).