Shandong Chong has a strong technical force and professional production team, with an annual output of 50,000 ¢ 170mm-¢ 500mm ductile iron, steel top iron skirt and steel crown and aluminum skirt piston; 50,000 sets of nodular cast iron, vermicular cast iron cylinder head and 30000the only cylinder capacity and R & D, production and the strength of new products, and be able to fully meet the needs of users at home and abroad.