Zhengzhou Top Rolling Technology Co., Ltd, established in 1995, is a state-level new and high technology enterprise integrated with scientific research, industry and trade，which is specialized in research，design，and manufacture of XGK rolling mill. The company, dominating by XGK series rolling mill technology, which is invented by Mr. Zheng Hongzhuan and has gained over 21 items of patent protection rights in 62 countries and regions in the world, specializes in engineering design of “cold and hot rolling strip steel”, developing and transferring of rolling technology, design and manufacturing of XGK series patent rolling technology and equipment for rolling production line and precise cold and hot rolling strip products, etc. At present, XGK rolling mill technology, which is in the leading position in the world, has developed to the sixth generation. The company has established long-term friendly cooperation relationship with over 30 universities, which provides powerful technical support and strong development impetus for the implementation of the project, such as University of Science and Technology Beijing, Wuhan University of Science & Technology, Beijing Steel Research Institute, Tsinghua University, Henan Metallurgy Design Institute, America Morgan Company, America Estun Company, Germany EMG Company, Italy Ansaldo Company, Anshan lron & steel Group, China First Heavy Industries, China Second Heavy Industries, Luoyang Mining Machinery Manufactory, Taiyuan Mining Machinery Manufactory, and Shanxi Calendering Equipment Manufactory. We has been in researching of XGK rolling mill for more than 20 years from 1987. The first patent was declared in 1989, and 107 patents have been declared in 62 countries & regions , and 57 patents for invention have been authorized currently in America, Japan, Germany, Italy, Korea, France, etc. Other patens are pending. In Jane., 2005, the international patent of XGK Rolling Mill back-up roller unit won a gold medal of Eureka World Invention; in May, 2005, complete equipments of XGK-LD1400 twenty-high rolling mill precision strip steel production line were listed in National Key Torch Program Project, and certificate have been issued to them; in May, 2006, international patent of two dimension control bending rolling mill won a gold medal of the ninth patent golden prize issued by World Intellectual Property Organization and State Intellectual Property Office.