Rolling bearing steel is used in the manufacture of rolling bearings of the rolling elements (ball, roller) and the inner and outer rings of the special steel can also be used to make precision measuring tools, Die, and Fuel Injection machine screw of precision coupling, such as needle body, piston and other wear-resistant parts. 1. Performance requirements of rolling bearing steel's main performance requirements are: ① high contact fatigue limit and elastic limit; ② high hardness and wear resistance; ③ appropriate toughness and corrosion resistance. 2. Composition characteristics of traditional low-carbon chromium bearing steel is steel, bearing steel, which is the main material, its composition characteristics: (1) carbon generally wc = 0.95% ~ 1.15%, to ensure the bearing steel hardness and wear resistance of high high; (2) alloying elements are generally low-alloy steel, the basic element is chromium, and wCr = 0.40% ~ 1.65%, its main role is to increase the hardenability of steel, and the formation of alloy cementite improve contact fatigue limit and wear resistance. (3) high purity, high uniformity 3. Common characteristics of bearing steel and heat treatment will have been satisfied international standards ISO683/Part the subject of bearing steel is divided into four categories: high-carbon chromium bearing steel (ie, all bearing steel hardenability), carburizing bearing steel, stainless steel and high temperature bearing bearing steel; our main bearing steel commonly used categories, brands, and performance of the main features shown in Table 12-11, the specific composition and heat treatment process described in the corresponding national standards. Carbon chromium bearing steel (such as GCr15) is the most commonly used bearing steel, the main heat treatment are: ① pre-heat treatment - annealing the ball, which aims to improve machinability and quenching for the organization and preparation; ② final heat treatment - quenching low-temperature tempering, which is the key to determine the performance of bearing steel, the purpose is to obtain high hardness (62 ~ 66HRC) and high wear resistance. In order to more completely eliminate residual austenite and the stress, stability, organization, improving the dimensional accuracy of the bearing, but also in the quenched after a cold treatment (-60 ℃ ~ -80 ℃), low temperature in the grinding time after treatment .
Complete specification material GCr18Mo
Origin / Manufacturer of domestic and imported diameter range
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