Title:
HIGH-STRENGTH HOT-ROLLED STEEL PLATE AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2011/111758
Kind Code:
A1
Abstract:
An inclusion, the major diameter of which is 3.0 µm or greater in a cross section having the plate width direction of a high-strength hot-rolled steel plate as the normal, wherein the maximum value of the major diameter/minor diameter ratio represented by (the major diameter of the inclusion)/ (the minor diameter of the inclusion) is 8.0 or less, and the sum of the rolling direction length per 1 mm2 cross-section of a predetermined inclusion group consisting of a plurality of inclusions, the major diameter of which is 3.0 µm or greater, and a predetermined extended inclusion, the length in the rolling direction of which is 30 µm or greater is 0.25 mm or less. The plurality of inclusions constituting the predetermined inclusion group are clustered at an interval of 50 µm or less with one another in both of the rolling direction and a direction perpendicular to the rolling direction. The predetermined extended inclusion is spaced at an interval of exceeding 50 µm from all inclusions, the major diameter of which is 3.0 µm or greater in at least one of the rolling direction or the direction perpendicular thereto.
Inventors:
TAKAHASHI, Yuzo (6-1 MARUNOUCHI 2-CHOME, CHIYODA-K, Tokyo 71, 〒1008071, JP)
高橋 雄三 (〒71 東京都千代田区丸の内二丁目６番１号 新日本製鐵株式会社内 Tokyo, 〒1008071, JP)
HAJI, Junji (6-1 MARUNOUCHI 2-CHOME, CHIYODA-K, Tokyo 71, 〒1008071, JP)
高橋 雄三 (〒71 東京都千代田区丸の内二丁目６番１号 新日本製鐵株式会社内 Tokyo, 〒1008071, JP)
HAJI, Junji (6-1 MARUNOUCHI 2-CHOME, CHIYODA-K, Tokyo 71, 〒1008071, JP)
Application Number:
JP2011/055556
Publication Date:
September 15, 2011
Filing Date:
March 09, 2011
Export Citation:
Assignee:
NIPPON STEEL CORPORATION (6-1 MARUNOUCHI 2-CHOME, CHIYODA-KU Tokyo, 71, 〒1008071, JP)
新日本製鐵株式会社 (〒71 東京都千代田区丸の内二丁目６番１号 Tokyo, 〒1008071, JP)
TAKAHASHI, Yuzo (6-1 MARUNOUCHI 2-CHOME, CHIYODA-K, Tokyo 71, 〒1008071, JP)
高橋 雄三 (〒71 東京都千代田区丸の内二丁目６番１号 新日本製鐵株式会社内 Tokyo, 〒1008071, JP)
新日本製鐵株式会社 (〒71 東京都千代田区丸の内二丁目６番１号 Tokyo, 〒1008071, JP)
TAKAHASHI, Yuzo (6-1 MARUNOUCHI 2-CHOME, CHIYODA-K, Tokyo 71, 〒1008071, JP)
高橋 雄三 (〒71 東京都千代田区丸の内二丁目６番１号 新日本製鐵株式会社内 Tokyo, 〒1008071, JP)
International Classes:
C22C38/00; B21B3/00; C21D9/46; C22C38/58
Attorney, Agent or Firm:
KOKUBUN, Takayoshi (5th Floor, NBF Ikebukuro City Building 17-8, Higashi-Ikebukuro 1-chome, Toshima-k, Tokyo 13, 〒1700013, JP)
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Claims: