재질 균일성 및 구멍확장성이 우수한 석출강화형 열연강판 및 그 제조방법
    7.
    发明申请
    재질 균일성 및 구멍확장성이 우수한 석출강화형 열연강판 및 그 제조방법 审中-公开
    材料均匀性和扩孔性优良的沉淀硬化型热轧钢板及其制造方法

    公开(公告)号:WO2017222343A1

    公开(公告)日:2017-12-28

    申请号:PCT/KR2017/006668

    申请日:2017-06-23

    摘要: 본 발명의 일 측면은 중량%로, C: 0.02~0.05%, Si: 0.01~0.3%, Mn: 1.0~1.6%, Ti: 0.04~0.1%, Nb: 0.01~0.05%, N: 0.008% 이하, 나머지 Fe 및 기타 불가피한 불순물을 포함하며, 하기 식(1)을 만족하고, 미세조직은 95면적% 이상의 페라이트 및 (Ti, Nb)C 복합석출물을 포함하고, 직경 10nm 이하의 (Ti, Nb)C 복합석출물 개수가 직경 10nm 초과의 (Ti, Nb)C 복합석출물 개수의 5배 이상으로 형성되어 있는 재질 균일성 및 구멍확장성이 우수한 석출강화형 열연강판에 관한 것이다. 식(1): 0.35 ≤ (Ti+Nb+V+Mo)/(C+N) ≤ 0.70 (단, 상기 식(1)에서 각 원소기호는 각 원소의 at. %를 의미하며, 강 중에 포함되지 않은 원소는 0으로 계산한다.)

    摘要翻译:

    以重量%计,本发明的一个方面,含有C:0.02〜0.05%以下,Si:0.01〜0.3%以下,Mn:1.0〜1.6%以下,Ti:0.04〜0.1%以下,Nb:0.01〜 0.05%,N:满足0.008%或以下,Fe和其它不可避免的包括杂质,平衡和下式(1),微结构包含至少95体积%的铁素体面积和的(Ti,Nb)的C复合析出物,并且直径 10nm以下的(Ti,Nb)的C复合析出物的复合析出物材料的均匀性和高的析出硬化型热轧钢板的孔放大能力的数目形成直径10nm的比(钛,铌)C更大的数作为至少5倍 会的。 (1):0.35≤(Ti + Nb + V + Mo)/(C + N)≤0.70其中各符号代表各元素的原子百分比, 元素被计为零。)

    METHOD FOR PRODUCING A HIGH STRENGTH STEEL SHEET HAVING IMPROVED DUCTILITY AND FORMABILITY, AND OBTAINED STEEL SHEET
    10.
    发明申请
    METHOD FOR PRODUCING A HIGH STRENGTH STEEL SHEET HAVING IMPROVED DUCTILITY AND FORMABILITY, AND OBTAINED STEEL SHEET 审中-公开
    生产具有改进的延展性和可成型性的高强度钢板的方法以及获得的钢板

    公开(公告)号:WO2017109542A1

    公开(公告)日:2017-06-29

    申请号:PCT/IB2015/059841

    申请日:2015-12-21

    申请人: ARCELORMITTAL

    IPC分类号: C21D9/46 C22C38/00

    摘要: A method for producing a steel sheet, the method comprising the following successive steps: providing a cold-rolled steel sheet, the chemical composition of the steel containing in weight %: 0.15% ≤ C ≤ 0.23%, 2.0 % ≤ Mn ≤ 2.8%, 1.0% ≤ Si ≤ 2.1%, 0.02% ≤ Al ≤1.0%, with 1.7% ≤ Si+Al ≤ 2.1%, 0 ≤ Nb ≤ 0.035 %, 0 ≤ Mo ≤ 0.3 %, 0 ≤ Cr ≤ 0.4 %, the remainder being Fe and unavoidable impurities, annealing the steel sheet at an annealing temperature T A so as to obtain a structure comprising at least 65% of austenite and up to 35% of intercritical ferrite, quenching the sheet at a cooling rate of at least 20°C/s from a temperature of at least 600°C down to a quenching temperature QT comprised between Ms-170°C and Ms- 80°C, heating the sheet up to a partitioning temperature PT between 350°C and 450°C and maintaining the sheet at this temperature for a partitioning time Pt comprised between 80s and 440s, immediately cooling the sheet down to the room temperature, the steel sheet having a final microstructure consisting of, in surface fraction: - between 40% and 70% of tempered martensite, - between 7% and 15% of retained austenite, - between 15% and 35% of ferrite, - at most 5% of fresh martensite, - at most 15% of bainite.

    摘要翻译: 一种用于生产钢板的方法,该方法包括以下连续步骤:提供冷轧钢板,钢的化学组成包含重量%:0.15%≤C≤0.23% ,2.0%≤Mn≤2.8%,1.0%≤Si≤2.1%,0.02%≤Al≤1.0%,1.7%≤Si+Al≤2.1%,0≤Nb≤0.035%,0≤Mo≤0.3%, 0≤Cr≤0.4%,其余为Fe和不可避免的杂质,在退火温度T℃下对钢板进行退火,以获得包含至少65%奥氏体和至多35% 以至少600℃的温度,以至少20℃/ s的冷却速率将片材淬火至包含在Ms-170℃和Ms-80℃之间的淬火温度QT,加热 将片材分成350℃和450℃之间的分配温度PT,并将片材在该温度下保持80s和440s之间的分配时间Pt,立即 将钢板冷却至室温,钢板具有最终的显微组织,其表面分数为:40%至70%的回火马氏体,7%至15%的残余奥氏体, - 15%至 35%的铁素体, - 最多5%的新鲜马氏体, - 最多15%的贝氏体。