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    Thick high-strength steel plate having superior brittle-crack propagation-stopping characteristic and manufacturing method therefor
    51.
    发明专利
    Thick high-strength steel plate having superior brittle-crack propagation-stopping characteristic and manufacturing method therefor 有权
    厚度高的钢板，具有优异的裂纹扩展停止特性及其制造方法

    公开(公告)号：JP2008248382A

    公开(公告)日：2008-10-16

    申请号：JP2008049849

    申请日：2008-02-29

    Applicant: Nippon Steel Corp ,  新日本製鐵株式会社

    Inventor： SHIRAHATA HIROYUKI ,  FUJIOKA MASAAKI ,  KOJIMA AKIHIKO ,  TANAKA YOICHI

    IPC: C22C38/00 ,  C21D8/02 ,  C22C38/14 ,  C22C38/58

    CPC classification number: C21D6/001 ,  C21D8/021 ,  C21D8/0226 ,  C21D9/46 ,  C21D2201/05 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/009

    Abstract: PROBLEM TO BE SOLVED: To provide a thick high-strength steel plate having superior brittle-crack propagation-stopping characteristics, which shows -10°C or lower as a temperature of Kca=6,000 N/mm
    1.5 though having a plate thickness of 50 mm or more, and a YP of a 390 to 460 MPa grade, and to provide a manufacturing method therefor.
    SOLUTION: This steel plate is made from a Ni-containing steel, mainly has a bainite structure and contains pearlite of 5% or less by fraction. In front and backside surface layer regions of 5% plate thickness, coarse ferrite with a circle-equivalent diameter exceeding 25 μm occupies 10% or less by fraction, and cementite has an average circle-equivalent diameter of 0.5 μm or smaller. When the interior region excluding the above surface layer regions in the C-cross-section is divided into isotropic areas, and measurement lines are drawn in the C-direction according to a sectioning method, and when two of a plurality of isotropic areas continuously adjacent to each other on the measurement line, though isotropic areas having circle-equivalent diameters smaller than 8 μm are excluded, of which the angle formed by the axes closest to the C-direction among their axes is less than 20°, are regarded as one equal crack-propagation resistive area, the equal crack-propagation resistive area shows the average circle-equivalent diameter expressed by the formula d=(7.11×[Ni%]+11)×(1.2-t/300)(μm) or smaller.
    COPYRIGHT: (C)2009,JPO&INPIT

    Abstract translation: 要解决的问题：为了提供具有优异的脆性裂纹扩展停止特性的厚的高强度钢板，其Kka = 6000N / mm的温度<1.5>为-10℃或更低， / SP>，其厚度为50mm以上，YP为390〜460MPa等级，并提供其制造方法。 解决方案：该钢板由含Ni的钢制成，主要具有贝氏体组织，并含有5％以下的珠光体。 在板厚为5％的正面和背面表面层区域，圆当量直径超过25μm的粗铁素体的分数占10％以下，渗碳体的平均圆当量直径为0.5μm以下。 当除了C面截面中的上述表层区域以外的内部区域被划分为各向同性区域时，根据切片方法在C方向上绘制测量线，并且当多个各向同性区域中的两个连续相邻 尽管不排除圆当量直径小于8μm的各向同性区域，其轴线<001>最靠近其轴线<001>之间的C方向的角度小于20° 被认为是一个相等的裂纹扩展电阻面积，相等的裂纹扩展电阻面积表示由公式d =（7.11×[Ni％] + 11）×（1.2-t / 300）表示的平均圆当量直径 ）（μm）以下。 版权所有（C）2009，JPO＆INPIT

    Method for producing high magnetic flux density grain-oriented silicon steel sheet
    52.
    发明专利
    Method for producing high magnetic flux density grain-oriented silicon steel sheet 有权
    用于生产高磁导率密度晶粒的硅钢板的方法

    公开(公告)号：JP2008069391A

    公开(公告)日：2008-03-27

    申请号：JP2006247674

    申请日：2006-09-13

    Applicant: Nippon Steel Corp ,  Akira Sakakura ,  Hiroshi Takechi ,  昭 坂倉 ,  新日本製鐵株式会社 ,  弘 武智

    Inventor： SAKAKURA AKIRA ,  TAKECHI HIROSHI

    IPC: C21D8/12 ,  B21B3/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/60 ,  H01F1/16

    CPC classification number: H01F1/14775 ,  B21B1/46 ,  C21D8/1205 ,  C21D8/1211 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D9/56 ,  C21D9/70 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/001 ,  C22C38/02 ,  C22C38/06 ,  H01F41/0233

    Abstract: PROBLEM TO BE SOLVED: To solve such problem as to have the point at issue to be improved as an industrially large difficult point, in which the high temperature heating (≥1350°C) of a slab obtained with a blooming or a continuous casting, is dispensable factor from conventionally metallurgical necessity to the production of a grain-oriented silicon steel sheet. SOLUTION: A middle thickness bar is cast with a continuous casting-hot-rolling continuous facility, and this bar is made to reach to the inlet of a hot-finish rolling during the temperature exceeding 1200°C to the bar under a solid-solution state of AlN, and the bar is hot-rolled and rapidly cooled, and thus, fine AlN is precipitated, that is, a method for efficiently producing a high magnetic flux density grain-oriented silicon steel sheet, at a low cost, is provided without completely performing the high temperature heating to the bar. COPYRIGHT: (C)2008,JPO&INPIT

    Abstract translation: 要解决的问题为了解决这个问题，作为一个工业上很大的困难点，需要改进的问题是这样一个问题，其中通过喷雾获得的板坯的高温加热（≥1350℃）或 连续铸造是从常规冶金需要到生产晶粒取向硅钢片的可分配因素。

    解决方案：使用连续铸造 - 热轧连续设备铸造中厚度棒，并且该棒在超过1200℃的温度下到达棒下方的热精轧入口 AlN的固溶态，热轧并快速冷却，从而以低成本沉淀出细小的AlN，即有效地制造高磁通密度晶粒取向硅钢板的方法 ，而没有完全对棒进行高温加热。 版权所有（C）2008，JPO＆INPIT

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