The ball is the important basic parts, especially the precision industrial ball plays a great role in national economic development. In some special conditions, the ball often need special materials, to complete the different environment to achieve the desired function. In fact, some special material ball has been widely used in various fields of the national economy, including the 9Cr18, 3Cr13 stainless steel, copper, aluminum, titanium alloy steel, agate, glass, Tao Ciqiu etc.. Application of them, not only to promote the development of steel industry, but also to promote the technology development of relevant industries and the progress of science and technology.
