Performance and Applications of Gr4 Titanium Plate

In China, commercially pure titanium is divided into four grades according to the amount of impurity elements it contains, namely TA1, TA2, TA3, and TA4. They basically correspond to Gr.1, Gr.2, Gr.3, and Gr.4 of American titanium grades respectively.

As the purity decreases, the strength and hardness of commercially pure titanium increase, while the plasticity, impact toughness, and fatigue resistance decrease. When high strength, hardness, and wear resistance are required, TA3 and TA4 can be selected. When better formability is required, TA1 and TA2 can be used.

TA4 titanium alloy is an α - type titanium alloy. This type of alloy is in an α - type single - phase state at room temperature and operating temperature and cannot be strengthened by heat - treatment (annealing is the only heat - treatment form), mainly relying on solid - solution strengthening.

The room - temperature strength of TA4 is generally lower than that of β - type and α + β - type titanium alloys (but higher than that of commercially pure titanium), while its strength and creep strength at high temperatures (500 - 600 °C) are the highest among the three types of titanium alloys. It also has stable microstructure, good antioxidant and welding properties, good corrosion resistance and machinability, but low plasticity (thermal plasticity is still good) and poor room - temperature stamping performance. Among them, TA7 is the most widely used. It has medium strength and sufficient plasticity in the annealed state, good weldability, and can be used below 500 °C. When the content of interstitial impurity elements (oxygen, hydrogen, nitrogen, etc.) is extremely low, it also has good toughness and comprehensive mechanical properties at ultra - low temperatures and is one of the excellent ultra - low - temperature alloys.

The tensile strength of TA4 is slightly higher than that of commercially pure titanium and can be used as a structural material in the medium - strength range. It is mainly used as a welding wire in China and is more widely used in the high - end electroplating hanger industry abroad.