ã??Founded in 1943, CSZY(Original Changsha Zhengyuan Engine Parts Factory), the first manufacturer of pistons and piston rings in ***** factory ranked the 158th among the 500 biggest machine building enterprises in China issued by the State Statistic Bureau in 1993, according to their profit and tax. ã?? Its annual output of piston rings from Φ32-Φ840mm has reached 30 million(including 12 million pieces of chromium plated rings), making up 9% of the market ***** types include plan, keystone tapered, stepped, Mapier, single-piece oil control ring , multipiece steel rail ring, steel ring and inlaid ring, with the materials of alloy cast iron, nodular cast iron, malleable iron, semi-malleable iron.and hot resistant ***** surface treatments are as follows:chromium-plating, phosphating, ionitriding, molybdeum-spraying and laser processing. The factory is a part supplier of more than 100 OEMs and over 1100 after-sale service fittings ***** three kinds of piston rings for Santana, CA488, and Cummins engines have received part production licences granted by ShangHai Volkswagen AG, the First Motor Plan of China, and Chongqing Automobile Eingine Plant after strict test and appraisal at home and abroad.Since regular supply relations with the famous Chinese enterprises(Guangxi ***** inc, The first Motor Plant, Shanghai Volkswagen AG, Chongqing Automobile Eingine Plant and Shanghai Diesel Engine Stock inc, ., ect.)have been established, its marketiong area is getting wider and wider. By the year of 2000, the factory have supplied 70% of its production for the automobile industry and become a important production base of automobile parts in China.Hunan Zhengyuan Engine Parts Factory with a history of 60 years will change beyond recognition.