Use titanium sponge instead of stainless steel high pressure

 As another example, the SR - 71 high speed scout (flight Mach number is 3, altitude 26212 meters), titanium accounted for 93% of the plane structure weight, so-called "titanium sponge" aircraft. When aeroengine in esteem than increased from 4 to 6 to 8 ~ 10, compressor outlet temperature accordingly increased to 500 from 200 ~ 300 ° C to 600 ° C, originally made of aluminium low-pressure compressor disk and blade must use titanium alloy material, or use titanium sponge instead of stainless steel high pressure compressor disk and blade, in order to reduce the structure weight. In the 70 s, the dosage of titanium alloy in the aircraft engine generally accounts for 20% ~ 30% of total weight structure, mainly used in the manufacture of compressor parts, such as forging of titanium fan, compressor disk and blade, titanium compressor casing, intermediate Titanium casting, bearing housing, etc. Spacecraft, which make use of the specific strength of titanium alloy, corrosion resistance and low temperature resistance to manufacture all kinds of pressure vessel, fuel tank, fasteners, instrument strap, architecture and rocket shell. Artificial earth satellite, the lunar module, manned spacecraft and space shuttle USES titanium alloy plate weldments. Titanium‬ precision castings,‪#‎Titanium_castings‬ Sunrui‪ Titanium‬ precision castings,‪Titanium castings‬  www.sunrui-titanium.com