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1. (IN2979/KOLNP/2012) HIGH STRENGTH STEEL SHEET HAVING EXCELLENT WARM STAMP FORMABILITY AND METHOD FOR MANUFACTURING THE SAME

官庁 : インド
出願番号: 2979/KOLNP/2012 出願日: 05.10.2012
公開番号: 2979/KOLNP/2012 公開日: 21.06.2013
公報種別: A
PCT 関連事項: 出願番号:PCTJP2011059459 ; 公開番号:WO2011126154 クリックしてデータを表示
IPC:
C22C 38/00
C21D 9/46
C22C 38/14
C 化学;冶金
22
冶金;鉄または非鉄合金;合金の処理または非鉄金属の処理
C
合金
38
鉄合金,例.合金鋼
C 化学;冶金
21
鉄冶金
D
鉄系金属の物理的構造の改良;鉄系もしくは非鉄系金属または合金の熱処理用の一般的装置;脱炭,焼もどし,または他の処理による金属の可鍛化
9
特定の品物に用いられる熱処理,それに用いる炉,例.焼なまし,硬化,焼入れ,焼もどし(炉一般F27)
46
金属薄板用
C 化学;冶金
22
冶金;鉄または非鉄合金;合金の処理または非鉄金属の処理
C
合金
38
鉄合金,例.合金鋼
14
チタンまたはジルコニウムを含有するもの
出願人: JFE STEEL CORPORATION
発明者: FUNAKAWA Yoshimasa
優先権情報:
発明の名称: (EN) HIGH STRENGTH STEEL SHEET HAVING EXCELLENT WARM STAMP FORMABILITY AND METHOD FOR MANUFACTURING THE SAME
要約:
(EN) Disclosed are: a high-strength steel sheet having excellent hot rolling workability; and a process for producing the steel sheet. A steel material having a chemical composition, comprising in mass%, 0.01 to 0.2% of C, 0.5% or less of Si 2% or less of Mn 0.03% or less of P 0.01% or less of S 0.07% or less of Al and 0.01% or less of N and additionally containing at least one component selected from Ti Nb V Mo W and B is subjected to a hot rolling step and a heat treatment step sequentially wherein the hot rolling step comprises carrying out the hot rolling in which the steel material is heated at a temperature falling within an austenite single phase temperature range and the finish rolling termination temperature is increased to 860°C or higher and winding the steel sheet at a winding temperature of not lower than 400°C and lower than 600°C and the heat treatment step comprises carrying out a heat treatment at a temperature of 650 to 750°C. In this manner it becomes possible to produce a steel sheet having excellent hot rolling woakability which has both such an elongation property that the local elongation is larger than the uniform elongation at a test temperature of 400°C or higher and such an elongation property that the ratio of the uniform elongation to the entire elongation is 40% or more at a test temperature of lower than 400°C and which has a structure that is composed of a matrix comprising substantially only a ferrite single phase and an alloy carbide having a size of less than 10 nm and dispersed and precipitated in the matrix without requiring the choice of any variant.
また、:
EP2557193CN102834539US20130192725CA2795714KR1020120135521KR1020150127298
TH137163WO/2011/126154