Who is the only domestic supplier of aluminum in domestically produced large aircrafts?

On April 11th, China Commercial Aircraft Co., Ltd. (hereinafter referred to as “China Commercial Aircraft”), which shoulders the mission of making domestic large aircrafts, issued a 7050 thick plate engineering approval certificate to Chinalco Southwest Aluminum, marking that from this moment, Chinalco Southwest Aluminum 7050 aluminum alloy pre-stretched slab officially passed the airworthiness certification of China Civil Aviation, and was authorized by China Commercial Aircraft to enter the C919 qualified product catalog, becoming the only qualified domestic aluminum supplier（Aluminum coil manufacturer china） for large airplanes.
"Acquiring China Commercial Aircraft's authorized certification has become the only qualified supplier of aluminum in Shangfei, which is the largest recognition of Chinalco Southwest Aluminum's R&D and innovation capabilities, and has far-reaching strategic significance in promoting the localization of aviation aluminum. Li Yong, general manager of Chinalco Southwest Aluminum, said that relying on innovation, the 7050 aluminum alloy（Aluminum plate 7075/ 6061/2024） pre-stretching plate produced by Chinalco Southwest Aluminum was successfully equipped with the domestic large-scale aircraft C919, breaking the monopoly of foreign technologies and completely reversing the advanced aluminum alloy materials in China. Long-term dependence on imported passive situation.

According to Zhang Siping, product engineer of Chinalco Southwest Aluminum Technical Quality Department, the 7050 aluminum alloy （Aluminum coated strip 3003-O）pre-stretched slab is the most widely used aluminum alloy material in the aerospace field. The material is high-strength, high-toughness, fatigue-resistance, and damage-resistance. It is an indispensable key material for various key structural parts in the aerospace field. Its pre-stretched thick plate products can maintain overall straightness even after asymmetrical machining. No deformation characteristics. Due to high technical content and high added value, long-term implementation of foreign technology blockades has led to the long-term reliance on imports of 7050 aluminum alloy pre-stretched slabs, seriously restricting the research and development of key models such as domestic large aircrafts.

In order to improve aviation's urgent need for aluminum protection capabilities, it seized the initiative in the field of civil aviation. Chinalco Aluminium aims at aviation new aluminum alloy material requirements. At the initial stage of the domestic large aircraft project, it participated in the development of materials driven by COMAC. In the past 10 years, Chinalco Southwest Aluminium has given full play to its advantages in technology, equipment, and talents, and has broken through the key core technical problems such as the ultra-large-size ingot molding of 7050 alloy, metallurgical quality control, strong deformation rolling, and toughness heat treatment to meet the needs of commercial aviation in China. Filled the domestic blank.