PROCESS FOR PRODUCING HOT-ROLLED STEEL SHEET AND PROCESS FOR PRODUCING HOT-DIP GALVANIZED STEEL SHEET

WIPO Patent Application WO/2011/129465

A1

Disclosed is a process for producing a hot-rolled steel sheet, the process comprising a slab heating step in which a steel slab is heated in a slab heating furnace, a step in which the heated steel slab is hot-rolled with a rough roller and a finish roller to form a strip, and a winding step in which the strip is wound up with a wind-up machine. The series of steps ranging from the slab heating step to the winding step is conducted in a non-oxidizing atmosphere. The steel slab contains, in terms of mass%, 0.01-0.15% C, 0.1-1.8% Si, 1.0-2.7% Mn, 0.01-1.5% Al, 0.005-0.025% P, and up to 0.01% S. Also disclosed is a hot-dip galvanized steel sheet produced by pickling the hot-rolled steel sheet to remove the oxide scale, optionally cold-rolling the steel sheet, and thereafter plating the steel sheet with zinc by hot dipping.

SUZUKI, Yoshitsugu (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
鈴木　善継 (〒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)

JP2011/059768

October 20, 2011

April 14, 2011

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JFE STEEL CORPORATION (2-3Uchisaiwai-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)
SUZUKI, Yoshitsugu (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)

B21B9/00; B21B1/26; B21B3/00; C21D1/70; C21D1/76; C21D9/00; C21D9/46; C22C38/00; C22C38/06; C22C38/58; C23C2/06; C23C2/28

OCHIAI, Kenichiro (JFE TECHNO-RESEARCH CORPORATION7th Floor, Yanagiya building, 1-10, Nihonbashi 2-chome, Chuo-k, Tokyo 27, 〒1030027, JP)

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