Control method of network carbide of GCr15 bearing steel wire rod
A network carbide and control method technology, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of reducing bearing fatigue life and difficult elimination, and achieve the effect of improving processing performance and prolonging fatigue life
Active Publication Date: 2013-12-25
ANGANG STEEL CO LTD
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Problems solved by technology
The more serious network carbides in the wire rod structure are not easy to eliminate during the spheroidizing annealing process of the bearing steel wire rod. After the bearing is made, it is easy to form cracks at the network carbides during the service process of the bearing, thereby reducing the bearing's wear resistance. fatigue life
Method used
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Embodiment Construction
[0012] The control method of GCr15 bearing steel wire rod reticular carbide in the present invention, the section size of the continuous casting bloom is 280×380mm, and the electromagnetic stirring at the end of the crystallizer and the solidification end is used in the continuous casting process to reduce the segregation of the continuous casting slab and use a relatively large current The strength and low stirring frequency improve the electromagnetic stirring effect; the high temperature diffusion annealing process is adopted in the continuous rolling process to further reduce the segregation of the continuous rolling billet; the wire rolling process changes the traditional air cooling process and adopts the water cooling process to speed up the cooling speed of the wire rod.
[0013] Embodiment and comparative example process parameter and network carbide control effect are shown in the following table:
[0014] Embodiment, comparative example process parameter and network ...
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The invention provides a control method of network carbide of a GCr15 bearing steel wire rod. A soaking temperature of a continuous rolling billet is 1200-1250 DEG C, the total time in a furnace is 10-14 h, and a final rolling temperature is not less than 950 DEG C; the billet is rolled to a wire rod after being heated, a spinning temperature of the wire rod is controlled to 880-930 DEG C, a water cooling speed is 15-40 DEG C / s, a water cooling time is 10-50 s, and a coiling temperature is controlled to 200-400 DEG C. After the control method provided by the invention is applied in production, the tissue grade of the network carbide of the GCr15 bearing steel wire rod can be decreased from not more than 2.0 grades to 0.6 grades, thereby improving the processing performance of the bearing steel wire rod and facilitating the prolonging of the fatigue service life of the bearing.
Description
technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for controlling network carbides in GCr15 bearing steel wire rods. Background technique [0002] High-quality bearing steel wire rod needs to have a good service fatigue life, which requires to eliminate the network carbide in the wire rod structure as much as possible, or make the network carbide in the wire rod structure as slight as possible. The more serious network carbides in the wire rod structure are not easy to eliminate during the spheroidizing annealing process of the bearing steel wire rod. After the bearing is made, it is easy to form cracks at the network carbides during the service process of the bearing, thereby reducing the bearing's wear resistance. fatigue life. [0003] Wuhan Iron and Steel (Group) Company's invention patent titled "Method for Reducing the Carbide Network Level of Bearing Steel Wire Rod" is as follows: first, heat up t...
Claims
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Login to View More IPC IPC(8): C21D8/02C21D9/70C21D9/52
Inventor 郭大勇任玉辉王秉喜高航
Owner ANGANG STEEL CO LTD