According to recent sources from the China Machinery Industry Federation and Chinese Mechanical Engineering Society, "Application of High-strength High-elongation Ductile Cast Iron Crankshaft", a project of Guangxi Yulin Yuchai Parts Manufacturing Co., Ltd. (YPM), has won the second prize of 2013 China Machinery Industry Technology Award. This is also the highest national honor for R & D project won by the company since its establishment.
The material technology of QT800-6 ductile cast iron crankshaft is independent intellectual property owned by YPM, has won a patent for invention (A Production Method of Ductile Cast Iron, Patent No. 03119014.6). QT800-6 material can still maintain high ductility and plasticity in high-strength conditions, and has been up to plastic material standards. As the material overcomes the weaknesses of low ductility and plasticity of common ductile iron materials while retaining advantages of traditional ductile iron materials over steel materials such as high yield ratio, high hardness, high torsional strength, good abrasive resistance and good processing performance, its macro fracture toughness and fatigue strength have been increased significantly.
The success of QT800-6 ductile cast iron crankshaft has changed people's traditional concept that "iron is inferior to steel", filled a gap in "dual-high" ductile cast iron at home and abroad, and developed new application fields of ductile cast iron. It is innovative and be of great significance to economic development and technological progress.
(Wu Zhihua/Tao Qianzhao)