To improve the performance of the sheet metal, usually by heat treatment process, through the different annealing, tempering and quenching, change the plate inside the atomic distribution, in the forging and stamping process, cold processing, thereby improving the performance of the sheet metal. The flange is usually the most widely used to start from here, to improve the metal performance of flange by different processing.
Flange manufacture is a kind of forging industry, because the forging industry is environmental pollution, such as production will emit a lot of poisonous and harmful gas, will also release a lot of dust, in some advanced countries, requirements and regulations for the production is more, as a result, such as flange production forging industry mostly focused on developing a large number of production more. But in the international market, the demand for flange is larger, so the flange import export become one of the "industry in the world.
