Low temperature resistant imported bearing steel

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In aerospace technology, imports of liquid fuel rocket turbopump bearings operation of liquid oxygen and liquid hydrogen. Temperature and liquefied equal. Ordinary import bearing steel martensite, originally toughness is not ideal, there are low-tempera ture brittleness, such as for the low temperature of -5 ~ -200 ℃, in fact, due to the condensation of moisture in the air in imports bearing surface rust , it should be made of stainless steel. Generally martensitic stainless steel cryogenic treatment, to ensure that their organizations do not change. Liquid oxygen (boiling point of -183 ℃) the used SUS4400 steel imports radial ball bearings and cylindrical roller the imported bearings made running test results show that the imported bearings addition to the wall surface some wear no special abnormal, can withstand up to 20,000 rpm / min of speed, but then imported bearing cage must be manufactured using special materials. Low temperature resistant imported bearing cage itself is also useful stainless steel, commonly used austenitic SUS304 steel and martensitic steel of SUS440V former is easy to process, use more.
In short, the key technology of low temperature resistant import bearing steel is no low-temperature b rittleness and corrosion resistance to condensed water, and can achieve the surface hardness of the martensitic SUS4400 of HRC56 ~~ 60, lower than the commonly used imported bearing steel, so the basic static load rating and basic dynamic load rating, or its life than the same sizes used the same basic model imported bearing steel imports bearing lower, it must be noted. thrust roller bearing