The production of stainless steel bars is rising with the development of stainless steel. As the application range of stainless steel bars is more and more extensive, such as the foundation of high-rise buildings in cold areas, the isolation net beside the highway, household necessities, etc., the hot rolling production of stainless steel bars has been greatly developed, 30% of our stainless steel products, foreign countries only account for 8%-10%. With the rapid development of cutting-edge technologies such as petroleum, chemical industry, energy and atomic energy, aerospace, and Marine development, higher comprehensive performance requirements have been put forward for stainless steel, which not only requires good corrosion resistance, but also requires high strength, high temperature and high pressure resistance, radiation protection, low temperature resistance and other properties, so that the varieties and types of stainless steel have been further developed.