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Hot rolled electrical steel sheet excellent in magnetic characteristics and corrosion resistance and method for production thereof UPDATE

外国特許コード F110003301
整理番号 A061-08EP
掲載日 2011年6月22日
出願国 欧州特許庁(EPO)
出願番号 00931586
公報番号 1116798
公報番号 1116798
出願日 平成12年5月26日(2000.5.26)
公報発行日 平成13年7月18日(2001.7.18)
公報発行日 平成17年8月3日(2005.8.3)
国際出願番号 JP2000003398
国際公開番号 WO2000073524
国際出願日 平成12年5月26日(2000.5.26)
国際公開日 平成12年12月7日(2000.12.7)
優先権データ
  • 特願1999-148325 (1999.5.27) JP
  • 2000WO-JP03398 (2000.5.26) WO
発明の名称 (英語) Hot rolled electrical steel sheet excellent in magnetic characteristics and corrosion resistance and method for production thereof UPDATE
発明の概要(英語) (EP1116798)
A method for producing a hot-rolled electrical steel sheet excellent in magnetic characteristics and corrosion resistance, characterized in that the method comprises providing heating a super high purity iron having the composition: Fe: 99.95 mass % or more, C + N + S: 10 mass ppm or less, 0: 50 mass ppm or less, and balance: inevitable impurities, heating the iron to the gamma region thereof, carrying out a hot rolling at the gamma region under a condition wherein a total draft is 50 % or more and the friction coefficient between a roll and a rolled material is 0.3 or less at least in one pass, and then cooling the rooled iron under a condition wherein the average cooling speed in the range of Ar3 transformation point to 300 DEG C is 0.5 to 150 DEG C/min, thereby forming orientation grains having <100> axes integrated to the direction perpendicular to a sheet plane.
特許請求の範囲(英語) [claim1]
1. A hot rolled electromagnetic steel sheet consisting of a super-high purity iron comprising Fe: not less than 99.95 mass%, C+N+S: not more than 10 mass ppm, O: not more than 50 mass ppm and the remainder being inevitable impurity, and having excellent magnetic properties and corrosion resistance.
[claim2]
2. A method of producing a hot rolled electromagnetic steel sheet having excellent magnetic properties and corrosion resistance, characterized in that a super-high purity iron comprising Fe: not less than 99.95 mass%, C+N+S: not more than 10 mass ppm, O: not more than 50 mass ppm and the remainder being inevitable impurity is heated to gamma -zone and subjected in this gamma -zone to hot rolling at a total rolling reduction of not less than 50% and under condition that at least one pass is a friction coefficient between roll and rolling material of not more than 0.3 and thereafter cooled at an average cooling rate of 0.5~150 DEG.C over Ar3 transformation point ~300 DEG.C.
[claim3]
3. A method of producing a hot rolled electromagnetic steel sheet having excellent magnetic properties and corrosion resistance, characterized in that a super-high purity iron comprising Fe: not less than 99.95 mass%, C+N+S: not more than 10 mass ppm, O: not more than 50 mass ppm and the remainder being inevitable impurity is heated to gamma -zone and subjected in this gamma -zone to hot rolling at a total rolling reduction of not less than 50% and under condition that at least one pass is a friction coefficient between roll and rolling material of not more than 0.3 and a strain rate of not less than 150 l/second and thereafter cooled at an average cooling rate of 0.5~150 DEG.C over Ar3 transformation point 300 DEG.C.
  • 出願人(英語)
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • 発明者(英語)
  • ABIKO KENJI
国際特許分類(IPC)
欧州特許分類/主・副
  • C21D008/12D2
  • C22C038/00B
  • C22C038/00D
指定国 (EP1116798)
Contracting States: DE FR GB IT NL SE
参考情報 (研究プロジェクト等) CREST Phenomena of Extreme Conditions AREA
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