The hardness and basic knowledge of titanium alloy Pipe

Titanium alloy Pipe

The hardness and basic knowledge of titanium alloy Pipe
Titanium pipe with light weight, high strength, excellent mechanical performance. It is widely used in the heat exchange equipment, such as the calandria heat exchanger, coil heat exchanger, coiled pipe type heat exchanger, condenser, evaporator and pipelines etc.. At present, a lot of nuclear power industry to the titanium tube as the standard of its units.
Titanium tube in accordance with the requirements and performance of the different implementation of two national standards: ASTM GB/T3624-1995GB/T3625-1995 337338
Supply brands: TA0, TA1, TA2, TA9, TA10, BT1-00, BT1-0, Gr2, Gr1
Supply specifications: diameter 4~114mm
Wall thickness Delta 0.2~4.5mm
Within the length of 15m
Titanium alloy is a titanium alloy which is made of titanium. Titanium has two kinds of homogeneous crystals: 882 of the following is a dense row of six square structure a titanium, 882 for the body centered cubic titanium.
The alloy elements can be divided into three categories according to their effects on the phase transition temperature:
The stability of alpha phase, the increase of the temperature of the phase change element is a stable element, there are aluminum, carbon, oxygen and nitrogen, etc.. The aluminum is the main alloy element, which has obvious effect on improving the normal temperature and high temperature strength, reducing specific gravity and increasing the elastic modulus of the alloy.
The stability of the beta phase, reduce the temperature of phase change elements as beta stable elements, and can be divided into two types of isomorphous and eutectoid. The former have molybdenum, niobium, vanadium, etc.; the latter have chromium, manganese, copper, iron, silicon, etc..
The elements that have little effect on the phase transition temperature are neutral elements, such as zirconium, tin, etc..
Oxygen, nitrogen, carbon and hydrogen are the main impurities in titanium alloy. Oxygen and nitrogen in the alpha phase have a greater solubility, the titanium alloy has a significant strengthening effect, but it makes the plastic drop. The content of oxygen and nitrogen in titanium is usually specified in the following 0.15 ~ 0.2% and 0.04 ~ 0.05%. The solubility of hydrogen in the alpha phase is small, and the hydrogen in the titanium alloy will produce a hydride, which makes the alloy brittle. The content of hydrogen in titanium alloys is controlled at 0.015%. Dissolution of hydrogen in titanium is reversible and can be removed by vacuum annealing.
Classification of titanium alloys
Titanium is isomer, the melting point of 1720 DEG C, in 882 DEG C below a close packed hexagonal lattice structure, said alpha titanium. 882 DEG C in a body centered cubic lattice structure, known as beta titanium. With the different characteristics of the two kinds of structures of titanium, adding appropriate alloying elements, the phase change temperature and phase change of the titanium alloy (alloys titanium) are gradually changed. At room temperature, there are three kinds of titanium alloys, which are divided into the following three categories: alpha alloy, (alpha + beta) and beta alloys. China, respectively, TC, TB, TA said.
Titanium alloy
It is a single-phase alloy, which is a solid solution of a phase, whether it is in the normal temperature or in the higher practical application temperature, the structure is stable, and the wear resistance is higher than that of pure titanium, and the oxidation resistance is strong. At the temperature of 500 to 600, the strength and creep resistance, but no heat treatment, and the room temperature strength of the heat treatment are not high.
Beta titanium alloy
It is a single phase alloy of beta phase solid solution, which has high strength, quenching and aging, and can be further strengthened, the room temperature strength can reach 1372 ~ 1666 MPa, but the thermal stability is poor, it is not suitable for use at high temperature.