Use of ALUMINUM ALLOY INGOT All kinds of aircraft use aluminum alloy as the main structural material.The skins, beams, ribs, trusses, compartments and landing gear of aircraft can all be made of aluminum.The amount of aluminum used in an aircraft varies, depending on its purpose.The aluminum alloy used in Boeing 767 passenger plane accounts for about 81% of the body structure weight.For example, the f-15 high performance fighter with a maximum flight speed of Mach 2.5 only USES 35.5% aluminum alloy.Some aluminum alloys have good low temperature performance, at -183 ~ -253[2oc] is not cold and brittle, can work in liquid hydrogen and liquid oxygen environment, it does not react with concentrated nitric acid and partial dimethylhydrazine, has good welding performance, therefore it is a good material for making liquid rockets.The fuel tanks, oxidizer tanks, intertank, interstage, tail and instrument compartments of the Saturn 5 launch vehicle that launched the Apollo spacecraft were all made of ALUMINUM ALLOY INGOT. The crew compartment, forward fuselage, middle fuselage, aft fuselage, vertical tail, flaps, elevons, and horizontal tail are all made of aluminum.The main structural material of various man-made earth satellites and space probes is also aluminum.