Date: 2013-08-20

The degree of control of the rolling bearing material

   (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.
    (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.

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