Title:
METHOD FOR CONTINUOUSLY CASTING STEEL AND PROCESS FOR PRODUCING STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2011/111858
Kind Code:
A1
Abstract:
Provided is a method for continuously casting an ultralow-carbon steel, the method including using a continuous casting machine equipped with a pair of upper magnetic poles, a pair of lower magnetic poles, and an immersion nozzle having a molten-steel ejection angle of 10-30º, excluding 30º, to produce the steel while controlling the flow of molten steel by means of direct-current magnetic fields to be applied respectively to the upper magnetic poles and the lower magnetic poles. The contents of chemical components of the ultralow-carbon steel are regulated so as to be within given ranges determined while taking account of the interfacial-tension gradient present in a concentration boundary layer formed in the front surface of the solidified shell. According to the width of the slab to be cast and to the casting speed, the intensities of the direct-current magnetic fields to be applied respectively to the upper magnetic poles and the lower magnetic poles are optimized. Thus, a high-quality cast slab having few defects caused by the inclusion of air bubbles, nonmetallic particles, or a mold flux can be obtained.
Inventors:
MIKI, Yuji (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
三木 祐司 (〒11 東京都千代田区内幸町二丁目２番３号JFEスチール株式会社知的財産部内 Tokyo, 〒1000011, JP)
MURAI, Takeshi (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
三木 祐司 (〒11 東京都千代田区内幸町二丁目２番３号JFEスチール株式会社知的財産部内 Tokyo, 〒1000011, JP)
MURAI, Takeshi (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
Application Number:
JP2011/056122
Publication Date:
September 15, 2011
Filing Date:
March 09, 2011
Export Citation:
Assignee:
JFE STEEL CORPORATION (2-3 Uchisaiwai-cho 2-chome, Chiyoda-ku Tokyo, 11, 〒1000011, JP)
JFEスチール株式会社 (〒11 東京都千代田区内幸町二丁目２番３号 Tokyo, 〒1000011, JP)
MIKI, Yuji (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
三木 祐司 (〒11 東京都千代田区内幸町二丁目２番３号JFEスチール株式会社知的財産部内 Tokyo, 〒1000011, JP)
JFEスチール株式会社 (〒11 東京都千代田区内幸町二丁目２番３号 Tokyo, 〒1000011, JP)
MIKI, Yuji (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
三木 祐司 (〒11 東京都千代田区内幸町二丁目２番３号JFEスチール株式会社知的財産部内 Tokyo, 〒1000011, JP)
International Classes:
B22D11/115; B21B1/22; B22D11/00; B22D11/10; B22D11/11; B22D11/18; C22C38/00; C22C38/14; C22C38/60
Attorney, Agent or Firm:
OCHIAI, Kenichiro (7th floor Yanagiya building, 1-10, Nihonbashi 2-chome, Chuo-k, Tokyo 27, 〒1030027, JP)
Download PDF:
Claims: