Control method for improving plasticity of bearing steel wire rod

Abstract

The invention discloses a control method for improving the plasticity of a bearing steel wire rod, belonging to the control field of a steel rolling process of bearing steel. The method adopts processes of temperature control rolling, low-temperature finish rolling, two-stage alternate control water cooling, low-temperature spinning and air cooling control; the low-temperature finish rolling is performed at 820-850 DEG C in an austenite single-phase re-crystallization region so that 95% of net carbide-level small-specification net carbon of the original wire rod of bearing steel is reduced to below the level 1, the tensile strength is 1,180-1,460Mpa, and the percentage reduction of area is improved to 20-25%; 90% of the net carbon level of a large-specification wire rod is reduced to below the level 1.0, the tensile strength is 1,200-1,350Mpa, and the percentage reduction of area is improved to 15-20%. By adopting the method disclosed by the invention, the net carbide of bearing steel is reduced, the percentage reduction of area of the bearing steel is improved, the service life of the bearing steel wire rod can be prolonged, the wear resistance of the steel is enhanced, the probability of brittle failure of the bearing steel is remarkably reduced, and the product yield is improved.

Description

technical field [0001] The invention relates to a control method for improving the comprehensive performance of bearing steel wire rods, belonging to the field of bearing steel rolling process control. It is suitable for reducing the level of reticular carbides in bearing steel and improving the plastic properties of bearing steel, especially for the production process control of improving the comprehensive mechanical properties of bearing steel. Background technique [0002] Bearing steel wire is the main material used to manufacture bearing rolling elements and various bearing parts. The mechanical properties of bearing steel, including plasticity indicators such as reticular carbide and area shrinkage, directly affect the wear resistance of rolling elements and various bearings. performance, fatigue cycle and other service life. [0003] The control of network carbides has always been a problem that technicians have worked hard to explore so far. The formation of network...

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Problems solved by technology

[0004] The ubiquitous problem of high-carbon steel, especially high-carbon bearing steel, is that brittle fracture occurs after rolling or within a period of aging. %, the fracture is basically brittle

[0006] The above two methods have improved the service life of the bearing steel to varying degrees and reduced the carbide level of the bearing steel, but the disadvantage is that the first method has higher requirements for the capacity of the equipment rolling mill, and requires the equipment to have the ability of ultra-low temperature rolling. The second method has a greater contribution to the carbon network of bearing steel, but the plasticity index does not mention

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