The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 23, 1977
Filed:
Dec. 09, 1975
Katashi Saito, Yokohama, JA;
Toshio Matsumoto, Yokohama, JA;
Nobuhisa Hasebe, Yokohama, JA;
Tatsuo Kobatake, Yokohama, JA;
Nippon Kokan Kabushiki Kaisha, Tokyo, JA;
Abstract
In a type of continuous casting of steel in which a straight mold is employed and a cast strand is guided while being bent, molten steel is continuously teemed into said straight mold; an unsolidified cast strand with a solidified shell formed on it is guided substantially vertically downward within a range from 3 to 7m from the meniscus of molten steel in said straight mold; then, said unsolidified cast strand being in the vertical position is guided within a range from 1 to 4m while being bent at multiple points by gradually decreasing the radius of curvature of said cast strand for each of successively arranged pairs of bending rollers; then the solidification of said unsolidified cast strand thus bent at multiple points is completed before a spot-straightening point while further guiding said cast strand along a constant curvature, the track length of said constant curvature guide being within a range from 35 to 85% of the length from said meniscus of molten steel in said straight mold up to said spot-straightening point; then, said cast strand is reduced, near its solidification completing point, at a draft of 0.1 to 2.0% per pair of reduction rolls; and then, said reduced cast strand is straightened in a substantially horizontal direction at a single point at said spot-straightening point; whereby a continuously cast strand free from or with remarkably decreased inner and outer defects is obtained.