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1. (CN102834539) High-strength steel sheet having excellent hot rolling workability, and process for production thereof

官庁 : 中華人民共和国
出願番号: 201180018211.2 出願日: 11.04.2011
公開番号: 102834539 公開日: 19.12.2012
特許番号: 102834539 特許付与日:
公報種別: A
(国内移行後) 元 PCT 国際出願 出願番号: ; 公開番号:2011126154 クリックしてデータを表示
CPC:
C21D 8/0263
B32B 15/013
C21D 1/673
C21D 6/00
C21D 8/0426
C21D 2211/005
C21D 2211/008
C22C 38/001
C22C 38/002
C22C 38/02
C22C 38/04
C22C 38/06
C22C 38/12
C22C 38/14
C23C 2/00
C23C 2/02
C23C 2/26
C23C 2/28
出願人: Jfe Steel Corp.
発明者: Funakawa Yoshimasa
代理人: jin longhe mu dejun
優先権情報:
発明の名称: (EN) High-strength steel sheet having excellent hot rolling workability, and process for production thereof
(ZH) 温加工性优良的高强度钢板及其制造方法
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 DEG C or higher and winding the steel sheet at a winding temperature of not lower than 400 DEG C and lower than 600 DEG C and the heat treatment step comprises carrying out a heat treatment at a temperature of 650 to 750 DEG 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 DEG 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 DEG 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.
(ZH)

本发明提供温加工性优良的高强度钢板及其制造方法。依次实施:热轧工序,将具有如下组成的钢原材加热至奥氏体单相温度区后,实施终轧结束温度为860℃以上的热轧,在卷取温度为400℃以上且低于600℃下卷取,其中,所述钢原材的组成为,以质量%计,含有C:0.01~0.2%、Si:0.5%以下、Mn:2%以下、P:0.03%以下、S:0.01%以下、Al:0.07%以下、N:0.01%以下,还含有选自Ti、Nb、V、Mo、W、B中的一种或两种以上;和热处理工序,在650~750℃的温度区实施热处理。由此,得到温加工性优良的钢板,兼具有在试验温度为400℃以上时局部伸长率大于均匀伸长率的拉伸特性、和在试验温度低于400℃时均匀伸长率相对于总伸长率的比率为40%以上的拉伸特性,还具有实质上为铁素体相单相的基质、和在该基质中尺寸小于10nm的合金碳化物以无变量选择的状态分散析出的组织。


Also published as:
EP2557193US20130192725CA2795714KR1020120135521KR1020150127298TH137163
IN2979/KOLNP/2012WO/2011/126154