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Application of Heat Treatment Technology

Author: langfeng Time: 2017-10-20

Application of Heat Treatment Technology

(1) expanded the scope of application of GCr15 steel
Generally GCr15 steel M quenching ring effective wall thickness below 12mm, but BL quenching due to nitrate cooling capacity, if the use of mixing, trolling, adding water and other measures, ring effective wall thickness can be expanded to about 28mm.
(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 salt for a long time isothermal, the surface of the central tissue changes almost simultaneously, so the hardness is stable, uniformity is good, the general GCr15 steel BL After quenching hardness of 59 ~ 61HRC, uniformity ≤ 1HRC, 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, resulting in quenching microcracks. 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.
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