The free carbon content is not more than 5%. This company produces the parts heat treatment process is not stable, high rejection rate, rising costs, need experienced professionals to help the company to solve this difficult casting aluminum alloy, the capacity of radial stable heat treatment process and control within 5% rejection rate, ensure that the mechanical properties and microstructure, hardness control around HBS220, both can satisfy product requirements, large casting manufacturer and convenient for machining. At present, the production of stress line clamp using the traditional cutting, cutting and saw cutting methods, manual operation, low efficiency, high cost, it is necessary to design an automatic production line of punching and shearing machinery, to achieve automatic continuous production of flat iron pad and saw pipe, improve efficiency. To R & D, production, sales as one of the internal combustion engine piston ring products. The forced seal oil ring products independently innovated by the company have been patented in China, the United States, Japan, Canada, the European Union and many other regions. In line with the industrial policy, it has been mass produced at present, and the aluminum casting process products are in short supply. In 2009, it sold a total of 290,000 sets, with sales revenue of 34.19 million yuan and profit of 9.05 million yuan.