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We all know that heat treatment technology, then the number of people who use a real understanding of it? Today, I put the application of bearing heat treatment technology to explain to you.
(1) to expand the scope of application of GCr15 steel, GCr15 steel generally quenched ring when the effective wall thickness of 12mm below, but BL quenching due to strong cooling capacity of nitrate, if the use of mixing, rolling, water and other measures, Effective wall thickness can be expanded to about 28 mm.
(2) hardness is stable, good uniformity
As the BL change is a slow process, the general GCr15 steel to be 4h, GCr18Mo steel to be 5h, ferrule in the nitrate for a long time isothermal, the surface of the heart of the organization changes almost simultaneously, so the hardness is stable, uniformity, the general GCr15 steel BL After quenching hardness of 59 ~ 61HRC, uniformity ≤ 1 HRC, unlike the quenching when the ring wall thickness slightly larger on the emergence of low hardness, soft spots, uniformity and other issues.
(3) reduce the quenching, grinding cracks
In the production of railway and rolling mill bearings, because of the large size and heavy weight of the rolling mill, the M-structure is brittle in the quenching of the steel. In order to obtain the high hardness after quenching, the strong cooling measures are often adopted. As a result, the microcracks are quenched. BL structure is much better than M organization toughness, while the surface of the formation of up to -400 ~ -500MPa compressive stress, greatly reducing the tendency of quenching crack; grinding in the surface stress to offset part of the grinding stress, the overall stress level Down, greatly reducing the grinding cracks.
(4) bearing life increased
For the large impact load of the railway, rolling mill bearings, etc., after the use of M quenching when the main form of failure: assembly when the sleeve cracking, the use of the process by the impact of the outer ring block off the block, inner ring fragmentation, and isothermal quenching bearings As the impact toughness is good, the surface compressive stress, regardless of the assembly when the sleeve cracking, or the use of the process of jacket out of the block, the sleeve tuff tends to greatly reduce, and can reduce the edge of the roller stress concentration. Therefore, after the isothermal quenching than the M quenching after the average life expectancy and reliability.


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