Edit austenitic low temperature steel austenitic steel with high toughness at low temperatures, generally do not ductile - brittle transition temperature. Press alloy composition can be divided into three series: ①Fe-Cr-Ni system Fe-Cr-Ni system. Mainly 18-8 chromium-nickel acid-resistant stainless steel. The steel temperature toughness, corrosion resistance and manufacturability are good, it has been applied to varying degrees of various cryogenic (-150 ~ 269 ℃) technology. ②Fe-Cr-Ni-Mn Fe-Cr-Ni-Mn-N system Fe-Cr-Ni-Mn and Fe-Cr-Ni-Mn-N system and. Such steels with manganese, nitrogen instead of part of the nickel to stabilize the austenite. Nitrogen also strengthen the role of the steel with high toughness, low permeability and stable austenite, suitable for ultra-low temperature non-magnetic (ie, low permeability material). As 0Cr21Ni6Mn9N and 0Cr16Ni22Mn9Mo2 etc. for non-magnetic structural components in -269 ℃. ③Fe-Mn-Al austenitic cold non-magnetic Fe-Mn-Al non-magnetic austenitic cold. Is developed by China save chromium, nickel new steel grades, such as 15Mn26Al4 etc. can partially replace chrome-nickel austenitic steels, used in very low temperatures below -196 ℃ region. If it can improve the chemical resistance of steel, but also to expand its scope of application.