α alloy contains a certain amount of stable α phase elements, balanced state mainly by the α phase composition. α alloy with small specific gravity, good thermal strength, with good weldability and excellent corrosion resistance, the disadvantage is low room temperature, usually used as heat-resistant materials and corrosion-resistant materials. (Ti-8Al-1Mo-1V) and α-alloys (Ti-2.5Cu) with small amounts of compounds are usually divided into α-alloy (TA7), α-alloy (Ti-8Al-1Mo-1V)

 

Titanium alloy according to the composition of the phase can be divided into three categories: α alloy, (α + β) alloy and β alloy, China were TA, TC, TB said.

 

① α alloy contains a certain amount of stable α phase elements, balanced state mainly by the α phase composition. α alloy with small specific gravity, good thermal strength, with good weldability and excellent corrosion resistance, the disadvantage is low room temperature, usually used as heat-resistant materials and corrosion-resistant materials. (Ti-8Al-1Mo-1V) and α-alloys (Ti-2.5Cu) with small amounts of compounds are usually divided into α-alloy (TA7), α-alloy (Ti-8Al-1Mo-1V) (Α + β) alloy contains a certain amount of stable α phase and β phase elements, the balance of the alloy structure of the α phase and β phase. (α + β) alloy with moderate strength, and heat treatment to strengthen, but poor welding performance. (α + β) alloy widely used, in which Ti-6Al-4V alloy production in all titanium accounted for more than half.

 

③ β alloy contains a large number of stable β phase elements, the high temperature β phase can be retained to room temperature. β alloy can usually be divided into heat-treatable β alloy (metastable β alloy and near metastable β alloy) and thermally stable β alloy. The heat-treatable β alloy has excellent plasticity in the quenched state and can be made to have a tensile strength of 130 to 140 kgf / mm2 by aging treatment. The β alloy is usually used for high strength and high toughness materials. Disadvantages are greater than the cost, high cost, poor welding performance, cutting difficult.

 

skills requirement

 

1: Titanium and titanium alloy bar chemical composition should be consistent with GB / T 3620.1, the provisions of the need to repeat the time, the chemical composition of the allowable deviation should be consistent with the provisions of GB / T 3620.2.

 

2: The diameter or side length of the hot-worked bar and its permissible deviation shall meet the requirements of Table 1.

 

3: After thermal processing by the car (grinding) light bar and cold-rolled, cold-drawn bar diameter tolerance should be consistent with the provisions of Table II.

 

4: After the thermal processing by car (grinding) light bar of the roundness should not be greater than half the size of its tolerance.

 

5: The length of the bar is 300-6000mm. The length of the bar is 300-2000mm. The length of the length or length shall be within the length of the length of the bar. The allowable deviation of the length is +20mm ; The length of the foot should also be included in the bar of the cut, the amount of each cut 5mm. Length or length should be specified in the contract.

 

Titanium is an important structural metal developed in the 1950s. Titanium alloys have been widely used in various fields because of their high specific strength, good corrosion resistance and high heat resistance. Many countries in the world are aware of the importance of titanium alloy materials, have their research and development, and has been practical application. Titanium is the periodic table class IVB elements, the appearance of like steel, melting point of 1 672 ℃, is a refractory metal. Titanium in the crust is rich in content, much higher than Cu, Zn, Sn, Pb and other common metals. China's titanium resources are extremely rich, only Sichuan Panzhihua area found in large vanadium-titanium magnetite, associated titanium reserves of about 420 million tons, close to the sum of foreign reserves of titanium. Titanium alloy can be divided into heat-resistant alloy, high strength alloy, corrosion resistant alloy (titanium-molybdenum, titanium-palladium alloy, etc.), low temperature alloy and special functional alloy (titanium-iron hydrogen storage material and titanium-nickel memory alloy) The