Control of the material factors affecting bearings life

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Before hardening steel in order to make the material factors affecting bearing life at its best, you first need to control the original organization, technical measures that can be taken are: high temperature (1050 ℃) aus tenitizing speed cooling to 630 ℃ isothermal normalizing pseudoeutectoid Analysis fine pearlite or cold to 420 ℃ temperature processing, bainite. Rapid thermal annealing, fine granular pearlite unwrought waste heat can be used to ensure that small and evenly distributed carbides. Austenitizing original organization in this state quenching, in addition to the integration into the carbide in austenite and undissolved carbides will gather into a fine granular.bearing manufacturers

When the steel in the original tissue is constant, the amount of quenched martensite carbonaceous (i.e. quenching heated austenite carbon content), the amount of retained austenite and the amount of undissolved carbides depends primarily on the quenching temperature and holding time With the quenching temperature increased (a certain time), reduce the number of undissolved carbides in the steel (quenched martensite c arbon content increased), increased number of retained austenite, hardness first increases with increasing quenching temperature, reached a peak and then decreases as the temperature rises. When the quenching temperature is constant, with the extension of austenitizing time, the number of undissolved carbides reduce the number of retained austenite increased hardness increased, long time, this trend slowed. When the small original tissue carbide, carbide Ease into austenite, so that the hardness after quenching of the peak towards lower temperature and appears in the austenitizing time shorter.
(1) steel carbide in the original organization before quenching requires small, dispersed. Austenitizing 630 ℃, can be high temperature or high temperature of 420 ℃, unwrought waste heat to achieve rapid annealing process.

(2) For the GCr15 steel after quenching, the requirement to obtain the average carbon content of about 0.55% cryptocrystalline martensite, about 9% Ar and 7 percent were uniform, round state undissolved carbides microstructure. Quenching temperature and time to control this microstructure.

(3) low temperature parts quenching after tempering requires larger surface residual compressive stress, which helps to improve fatigue resistance. Quenching may be used the surface short carburizing or nitriding treatment process, making the large compressive residual stress on the surface.screw bearings

(4) manufacturing steel bearing parts, and requires a high level of purity, is to reduce the content of O2, N2, P, oxides and phosphides. The electroslag remelting can be used to vacuum smelting technology measures the material oxygen content ≤ 15PPM appropriate.