One month after the successful launch of the Long March-3B carrier rocket carrying the "Beidou-3", at 12:41 on July 23, the Long March-5 Yaosi rocket lifted China's self-developed "Tianwen-1" Mars exploration The device lifted off smoothly. They compose the majestic overture of the symphony of China's aerospace power in space, and write the epic prologue of China's aerospace power. my country has not only become a world-leading aerospace power, but is also striding forward to a comprehensive aerospace power.
It is worth noting that no matter what kind of spacecraft, the structural materials and launch rocket structural materials used are mainly aluminum, titanium, high-temperature steel, composite materials, etc., but aluminum is used the most, accounting for more than 80% of the total material consumption. For example, the normal temperature propellant storage tank is welded with 5A06 and 2A14 aluminum alloys, and the liquid hydrogen and liquid oxygen storage tanks of Beidou-3’s last networked satellite are welded with 2219 aluminum alloy plates, which are produced by ZGLV Aluminum Technology Group The company provides that the rocket liquid oxygen kerosene fuel tank is also welded with 2219 aluminum alloy plates. Aluminum alloy has excellent low-temperature mechanical properties, and its strength and plasticity both increase with the decrease of temperature. This means that aluminum alloy has no low-temperature brittleness, and most structural steels have low-temperature brittleness.
2219 aluminum alloy is an aluminum-copper-manganese-titanium-vanadium-zirconium alloy. It is an American alloy. The production process is mature and stable. China has already mass-produced it. At present, China uses the third-generation aluminum alloy 2195 and 2197 alloy (they all contain lithium), and the fourth-generation 7055 and 7085 alloy in the structure of the carrier rocket compartment.
In recent years, my country's aluminum industry has provided a large number of key materials for national key aerospace projects such as the "Shenzhou" series of spacecraft, the "Chang'e" series of satellites, the "Long March" series of carrier rockets, the "Tiangong" series of target aircraft, and the C919 domestically produced large aircraft. While China has continuously made new achievements in the field of aerospace, it has also promoted the continuous innovation and development of China's high-end aluminum industry, making more aluminum materials fly into the blue sky, and helping my country advance toward a comprehensive aerospace power.