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Bearing steel is a steel with strict quality requirements. The current requirements for bearing steel are: user-free processing and inspection, quality improvement, specification refinement and dimensional accuracy, etc., and the importance of these requirements is getting higher and higher. To meet these requirements, JFE Steel uses a variety of equipment to ensure product quality and finish machining to produce bearing steel. These devices, combined with newly developed quality-enhancing technologies, can produce heat-treated and hot-rolled bearing steels with a wide range of sizes, high quality, and high added value.
KOYO bearing parts are of stable dimensions. After quenching, they should be cold-treated at -60 to 80°C, and the holding time is 2 to 4 hours. After cold treatment, the parts are returned to room temperature and tempered within 4 hours to prevent the parts from cracking.
Residual stresses that are not completely eliminated during low temperature tempering will be redistributed after grinding. These two kinds of stress will cause the size of the part to change, and even crack. To this end, supplementary tempering should be performed again, the tempering temperature is 120 ~ 160 ℃, heat preservation 5 ~ 10h or longer.
(2) Tool and mold GCr15 heat treatment: Because this steel is prone to white spot defects, heat treatment of large tool and mold is easy to crack. Slow heating or 690 ℃ long time (more than 5h) section isothermal can reduce the probability of cracking, austenitizing temperature selection 810℃±10℃, heat preservation coefficient a=1.6~0.9min/mm. Workpieces larger than 60mm in diameter require water-oil dual-liquid quenching.
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