Bearing inner ring and outer ring, roller and cage what material is used, what heat treatment?
Quenching adopts 840 degree, tempering adopts 155~165 degree, and precision bearing adopts cold treatment. Other chromium bearing steel heat treatment process in principle and GCr15 the same, but the specific process parameters are different.2 carburizing bearing steel: carburizing, high temperature tempering, two times quenching + low temperature tempering. The specific process is different depending on the steel used.3, stainless bearing steel: after forging annealing, quenching, cold treatment, low temperature tempering. Such as 9Cr18 steel using annealing 850~870 degrees, quenching 1050~1100, - 75 degrees cold treatment (of course, can also be used cryogenic treatment), 150~160 low temperature tempering.4, high temperature bearing steel: this kind of steel by annealing, quenching and tempering, quenching temperature according to the different tempering steel, usually by more than 500 degrees, that is to say, the tempering temperature must be higher than the temperature.
3, stainless bearing steel: in need of corrosion resistance places, such as sulfuric acid, hydrochloric acid, fertilizer and other industries bearing needs stainless steel bearings, generally use high carbon, high chromium stainless steel, such as 9Cr18 steel.4, high temperature bearing steel: need high temperature place of bearing, need high temperature bearing steel, this kind of steel adopts high speed steel, 18-4-1, 6-5-4-2, Cr4Mo4V and Cr15Mo4 steel.The heat treatment of bearing steel is different according to the material, application, type, size and technical requirement of the bearing. Usually through the following heat treatment:1, chromium bearing steel: spheroidizing annealing, quenching + low temperature tempering. For example, GCr15, annealing temperature is 770~810 degrees, furnace cooling.
Bearings can be classified into small, medium, large, or oversize types according to their performance and size.Bearing inner ring, outer ring and roller are made of special bearing steel, and the cage is made of carbon steel, usually carbon steel No. 20.1 chromium bearing steel: this kind of steel is specially used for making bearing, and it has special requirement for inclusion and grain size.General small bearings can use GCr9, GCr15, medium-sized bearings using GCr15, GCr15SiMn, large use of GCr15SiMn, and large bearings, because of hardenability problems, using carburizing bearing steel.2, carburizing bearing steel: steel rolling machinery or mining machinery and other problems that need impact resistance of carburizing bearing steel, small bearings with 20Cr, 20CrMo, 20CrMnMo, 20Cr2Ni4A, 20Cr2Mn2MoA carburizing steel, making use of large and oversize.
