Why bearing steel after high temperature tempering can improve high temperature resistant function

High temperature tempering is to put the parts after quenching bai, to du heating to 500 ~ 650 ℃, usually heated to zhipsk line ( The critical point Ac1) A certain temperature, heat preservation dao after a period of time, with appropriate cooling speed. High temperature tempering are a mixture of fine ferrite + granular cementite, namely the tempering sorbite arrangement. With excellent mechanical properties, more for structural parts of tempering after quenching, such as connecting rod, bolts, gears and shaft. High temperature quenching + tempering is called conditioning. Subsequent processing is commonly used in quenching, quenching and high temperature tempering, known as conditioning treatment, has wide application in industrial production. Tempering temperature range is 500 - 650 degrees Celsius, which is beneficial to eliminate internal stress, improve the metal plasticity and patience, is generally selected tempering cooling in the air. Generally between 25 ~ 35 HRC hardness, arrangements for tempering sorbite after tempering. First applied in the carbon content is 0. 3% - 0. 5% of the carbon steel and alloy steel manufacture all kinds of connection and the structure of the transmission parts. High temperature tempering is intended to get the strength, plasticity and patience are good mechanical properties. The previous: discern between true and false under the high temperature resistant bearing a: bearing axial locating method