In the industrial production process, the leftover materials (new materials) from shearing and stamping, including some directly usable pipes, rods, plates, etc., are in small quantities. Urban landscape projects mainly use stainless steel welded pipes. In the automotive industry, ferritic stainless steel 409 is mainly used for automotive exhaust pipes. In other industries such as urban water supply projects, environmental protection, petrochemical, and power industries, a considerable amount of stainless steel scrap is also generated. Pumps and containers for oil, gas, and acids are a large market that generates a large number of stainless steel scrap tanks, pipes, pumps, and valves. The main steel type is 1cr13 stainless steel.