Method for manufacturing high carbon chromium bearing steel

Abstract

The invention relates to a method for manufacturing high carbon chromium bearing steel, and belongs to the field of steel manufacturing. The method comprises the following steps that electromagnetic stirring at the head end and electromagnetic stirring at the tail end are separately carried out in the process of molten steel crystallization, the total amount of reduction in the soft reduction zoneis controlled at the tail end of molten steel solidification, then, a slab is heated in a heating furnace, the temperature of the core and surface of the slab is homogenized, so that a segregation structure in the slab is effectively diffused, and the slab is subjected to be rolled directly after being discharged from the furnace. In the example, the condensation process of the molten steel, theheating process of the slab in the heating furnace and the rolling process can be selectively adjusted, so that the cold working performance and hot working performance of the obtained steel are improved and the fatigue life of the bearing is also prolonged.

Description

technical field

[0001] The present application relates to the field of steel manufacturing, in particular, to a method for producing high-carbon chromium bearing steel. Background technique

[0002] The slab of high-carbon chromium bearing steel will undergo crystallization segregation when it is cooled and solidified, and it will extend along the rolling direction to form carbide-rich bands during hot rolling deformation. These carbide-rich bands are called carbide bands. The presence of carbide bands will directly affect the cold and hot workability of steel, thereby reducing the fatigue life of bearings.

[0003] For the problem of carbide strips, at present, the occurrence of the above problems is mainly suppressed by high-temperature diffusion treatment of the billet. Specifically, the carbide band shape is improved by prolonging the holding time of the high temperature section. This method can improve the banding quality, but it cannot stably control the carbide ban...

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