[China Aluminum] Wang Yawei, Minister of Civil Aviation Department of China Aviation Industry Group Corporation, made a brief introduction to the use of aluminum in the aviation category at the 2005 Aluminum World Symposium in China: Aluminum alloys are usually divided into four generations, the first generation of 7075, 2024, used for the first generation of regional airliners in the 1980s. Since the 1980s, with the development of aluminum alloy skills, second-generation aluminum alloys 7050, 7475, 7175 and 2124, 2224, 2324, etc., whose functions have been significantly improved, have been used on second- and third-generation regional aircrafts in succession. The third generation of new-style aluminum alloy 7150-T77, 7055-T77, 7085 high-strength and high-strength and 2524-T3 damage tolerance aluminum alloy has been widely used in Boeing 777, A380 and other large civilian passenger aircraft, but not found in regional passenger aircraft use. Domestic aluminum alloys such as LY12 (equivalent to U.S. 2024) and LC4 (equivalent to U.S. 7075), which are used in domestic transportation 7 (including the new boat 60), transportation 8 and transport 10, etc. For the second-generation aluminum alloys that have been greatly improved, at present during the research and development of high-purity aluminum alloys such as 2124 and 7050, some key skills are not restrained by equipment conditions, and they cannot be supplied at home. In order to satisfy the needs of Chinese regional passenger aircraft, aviation aluminum alloys are necessary to break the key skills of aluminum alloy casting skills, fine heat treatment skills, fine rolling and extrusion technologies. At present, due to the fact that casting equipment and other batch production equipment are not yet available and demand for imports is in the period of negotiation, it is completely unsatisfactory to approve production requirements, let alone collect airworthiness certificates. The CUPC Handmade Kitchen Sink,Single Bowl Kitchen Sink,Large Single Bowl Kitchen Sink,Single Bowl Sink Zhongshanshi JiaBaoLu Kitchen And Bathroom Products Co., Ltd , https://www.gabalusink.com