Process for the production of semi-finished articles of hard steels using a continuous casting operation
Patent 4617067 Issued on October 14, 1986. Estimated Expiration Date: 
October 14, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 14, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3430684 Manufacture of grinding members of ferrous alloys Method of working steel machine parts including machining during quench cooling Grinding members Patent #: 4221612 InventorAssigneeApplicationNo. 06/290529 filed on 08/06/1981US Classes:148/541, Continuous casting148/639, Localized or zone heating or cooling164/263, Associated with continuous casting means164/476, With metal working164/477, With diverse treatment164/486Directly applying liquid coolant to productExaminersPrimary: Rutledge, L. DewayneAssistant: Yee, Deborah Attorney, Agent or FirmInternational ClassesC21D 8/00 (20060101)C21D 9/00 (20060101) C21D 8/10 (20060101) C21D 9/40 (20060101) AbstractThe present invention is directed to a continuous casting process for the production of semi-finished articles or blanks of hard steels such as bars, wires or tubes having a carbon content higher than 0.75%. In this process, the blank obtained by continuous casting is submitted to a secondary cooling under the mold, cut and within three minutes after cutting, introduced into a reheating furnace in which its temperature is brought to a level slightly lower than the solidus temperature, maintained for a short period, and finally elongated in the hot condition. In a preferred embodiment, the liquid steel is stirred during the continuous casting operation by means of magnetic fields induced in the steel by electromagnetic coils disposed around the blank thereby facilitating dissolution of carbides contained within the liquid steel.Other References
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