Casting bearing steel technology

Around the world use continuous casting pouring way, more bearing steel continuous casting technology generally should include: 1) To control the liquid steel with low superheat for the main purpose of tundish heating technology, make continuous casting bearing steel casting superheat may control within 5 ~ 10 ℃, the tundish plasma heating technology has been in Japan, the United States, Germany, France and other countries meaning of steel industrial large-scale applications. 2) The slag detection, steel operations. Germany GMH, France Ascomeral ladle, intermediate tank has certain steel, installed in the bottom of the ladle AMEPA device, detection of ladle slag quantity. 3) No oxidation protection casting. GMH factory in Germany to protect controls the flow of blow N pouring, and USES the tundish nozzle blow N technology, to prevent the nozzle blocking; French Ascomeral between ladle and tundish, the use of resistant material to protect casing, tundish and mold in inert atmosphere between the O2 0 or less. 2%. 4) Mould liquid level automatic control, the French Ascomeral pouring of mould level closely monitored, and the inspection after pouring nozzle and stuffed with erosion degree. 5) Small amplitude of high frequency mould. 6) End of the mold and secondary cooling electromagnetic stirring, in order to obtain large and very uniform center equiaxial crystal area, almost all of the continuous casting bearing steel manufacturers to adopt two kinds of electromagnetic stirring device, thereby gaining the crystallization of uniform structure, no center loose organization. 7) To control the solidification process of continuous casting billet solidification end as the main purpose of light pressure technology, make the degree of central segregation of casting bearing steel billet on-line control, thus to solve the problem of center carbon segregation of casting bearing steel provides a effective way. Table 1 characteristics of typical manufacturer of bearing steel production equipment