Application of stainless steel forgings in shipbuilding, aerospace and aviation

Ships in the water for a long time, especially maritime transport, its working environment is harsh, corrosive, so stainless steel is widely used in ships, as early as the 1950s, speedboat propeller shaft has been forged with 20Crl3 martensitic stainless steel, manufacturing. Later, large ships began to use 06Crl7Nil2M02, austenitic stainless steel, 06Cr25Ni5Mo2 duplex stainless steel and 07Crl7Ni7Al precipitate hardened stainless steel to manufacture propeller; Marine engine exhaust system is made of 06Crl7Nil2Mo2 steel; Turbine blades are made of 12CrMo and 05Crl7Ni4Cu4Nb precipitate hardened steel; The non-magnetic engine is made of Cr-Ni austenitic stainless steel. Kitchen equipment is made of 06Crl9Nil0 and 06Crl7 steel; Made of 06Crl8Ni9 and 06CH7 steel for food, chemical and refrigerated ships; Cr-ni austenitic stainless steel with good low temperature performance; Minesweeper submarines are made of 022Cr21Nil7Mo2N and 022Cr22Nil3Mo3N steel; Marine shaft and heat exchanger are made of 022Cr22Nil3Mo2N steel. Patrol boat propeller, propeller shaft, rudder, etc. are made of 06Cr25Ni6Mo3CuN steel.



The environment of aerospace and aviation is harsh and corrosive, so stainless steel is widely used in aerospace and aviation industry. Most parts of aircraft and spacecraft are made of stainless steel. In the aerospace industry, austenitic stainless steel 06Crl8Ni9, 12Crl7Ni7, 06Crl8NillNb, 06Crl8Nil0Ti, 06Cr21Ni6Mn9N can be used for large liquid launch vehicles, high-strength low-temperature pressure vessels and low-pressure fluid vessels. Martensitic stainless steel 12Crl3, 20Crl3, 14Crl7Ni2 and 102Crl7Mo (9Crl8Mo) can be used for exhaust channel around the engine, rocket fuel storage tank and high hardness parts (such as rod, claw, pin, etc.).

In the aviation industry, precipitated hardened stainless steel is widely used in the mechanical system of aircraft, such as 04Crl3Ni8Mo2Al, 05Crl5Ni5CuNb, 05Crl7Ni4Cu4Nb, AM350, A-286, etc. Xb-70 large aircraft wing truss uses 05Crl5Ni5CuNb steel. 20Crl3Mn9Ni4, 06Crl9Nil0NbN and other austenitic stainless steel forgings can be used in aero-engine exhaust main pipe, branch pipe and turbine compressor hot gas pipe. The austenitic stainless steel such as 12Crl8Ni9Ti can be replaced by cr-Ni duplex stainless steel such as 12021 NiSTi in aircraft engine housing, combustion chamber wall of rocket engine and aircraft parts.