The invention relates to a preparation method of large-size tantalum plate, which includes the following steps: 1, surface repair grinding treatment; 2, stress relief annealing treatment; 3, multi-pass finished product rolling;4. The finished product is annealed to obtain the large-size tantalum sheet with thickness of 0.5mm ~ 2mm, width of 1000mm ~ 1300mm and length of 1400mm ~ 2100mm. The invention has the advantages of simple technological process, strong controllability of technological parameters and easy realization of industrial large-scale production. The invention USES the first on the processing technology of finished products after rolling, rolling, based on the control and optimization of rolling technology and annealing system, finally get the good surface quality, high flatness and excellent mechanical properties of big size of tantalum sheet, solves the existing process can not be continuously and steadily in the production of large size tantalum sheet technology bottleneck, strongly promote the development of tantalum material.
Because of its high melting point, corrosion resistance and good processing performance, tantalum metal is increasingly widely used in chemical industry, electronics, aerospace, weapon assembly and other fields, mainly used in the manufacture of capacitors, heat exchangers, coolers, pipes, gas turbine seals and armor piercing shells. For the chemical industry, which requires high corrosion resistance of materials, despite the high cost of a single investment, tantalum is still developing in the fierce competition with special steel, lead, glass, ceramics, enamel and plastic coatings due to its excellent durability and reliability. On the other hand, tantalum remains one of the largest and most widely used materials in the chemical industry due to its low maintenance and repair costs and long equipment life.
There is a great demand for large-size tantalum sheet with width greater than 1000mm and length greater than 1400mm, which is mainly used to prepare loose lining or chemical pipes for large chemical containers. The advantage of wide plate compared with narrow plate is that the weld number of container or pipe prepared by wide plate is less, so as to reduce the rupture failure in long-term corrosion environment and improve its service life. However, due to the limitation of domestic equipment and technology, tantalum sheet with width less than 1000mm and length less than 1400mm can only be produced at present, which brings a lot of inconvenience in the later use and greatly hinders the development and application of tantalum material.
