HIGH-CARBON HOT-ROLLED STEEL SHEET HAVING EXCELLENT FINE BLANKING PROPERTIES AND PROCESS FOR PRODUCTION THEREOF

WIPO Patent Application WO/2012/011598

A1

Provided are a high-carbon hot-rolled steel sheet which exhibits excellent fine blanking properties until the steel sheet is wound after hot-rolling and a process for producing the high-carbon hot-rolled steel sheet. Specifically provided is a high-carbon hot-rolled steel sheet having excellent fine blanking properties, which is characterized by having a composition comprising, in mass%, 0.10-040% of C, 1.0% or less of Si, 2.0% or less of Mn, 0.03% or less of P, 0.03% or less of S, 0.01% or less of N, 0.10% or less of Al, and a remainder made up by Fe and unavoidable impurities, wherein the area ratio of a proeutectoid ferrite phase in the entire structure is 10% or less and the steel sheet has a microstructure having a carbide spheroidizing ratio of 50% or more.

NAKAMURA, Nobuyuki (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
中村　展之 (〒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)
KOBAYASHI, Takashi (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)

JP2011/066789

January 26, 2012

July 19, 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)
NAKAMURA, Nobuyuki (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
中村　展之 (〒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)

C22C38/00; B21B3/00; B21B45/00; C21D9/46; C22C38/06; C22C38/60

OCHIAI, Kenichiro (JFE TECHNO-RESEARCH CORPORATION 7th floor, Yanagiya building, 1-10, Nihonbashi 2-chome, Chuo-k, Tokyo 27, 〒1030027, JP)

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