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    HIGH STRENGTH STEEL SHEET HAVING EXCELLENT FORMABILITY
    1.
    发明申请
    HIGH STRENGTH STEEL SHEET HAVING EXCELLENT FORMABILITY 审中-公开
    具有优异的可塑性的高强度钢板

    公开(公告)号：US20070196685A1

    公开(公告)日：2007-08-23

    申请号：US11627192

    申请日：2007-01-25

    申请人： Yuichi Futamura ,  Katsuhiro Yamamoto ,  Masaaki Miura

    发明人： Yuichi Futamura ,  Katsuhiro Yamamoto ,  Masaaki Miura

    IPC分类号： C22C38/22

    CPC分类号： C22C38/38 ,  B32B15/013 ,  C21D6/008 ,  C21D8/0226 ,  C21D8/0236 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/18 ,  C22C38/22 ,  C22C38/34 ,  Y10T428/12799

    摘要： A high strength steel sheet contains, in percent by mass, 0.03 to 0.2% of C, 0.5 to 2.5% of Si, 1 to 3.0% of Mn, 0.01 to 0.5% of Cr, 0.01 to 0.5% of Mo, 0.02 to 0.15% of Al, 0.15% or less of Ti, 0.15% or less of No, and 0.15% or less of V; wherein the remainder includes Fe and inevitable impurities, and the content of Si satisfies the following formula (1), α−4.1≦[Si]≦α−2.4,   (1) provided, α=6.9×([C]+[Mn]/6+[Cr]/5+[Mo]/4+[Ti]/15+[Nb]/17+[V]/14)1/2 is given, wherein [ ] shows the quantity (mass percent) of each element contained in the steel sheet. The high strength steel sheet is improved in formability (particularly, elongation), and excellent in balance between strength and elongation.

    摘要翻译： 高强度钢板以质量计含有0.03〜0.2％的C，0.5〜2.5％的Si，1〜3.0％的Mn，0.01〜0.5％的Cr，0.01〜0.5％的Mo，0.02〜0.15 ，Al的0.15％以下，Ti：0.15％以下，V：0.15％以下， 其中余量包括Fe和不可避免的杂质，Si的含量满足下式（1），<？in-line-formula description =“In-line formula”end =“lead”？> alpha-4.1 <= [ Si] <=α-2.4，（1）<？in-line-formula description =“In-line Formulas”end =“tail”？>提供，<？in-line-formula description =“In-line Formulas” α= 6.9×（[C] + [Mn] / 6 + [Cr] / 5 + [Mo] / 4 + [Ti] / 15 + [Nb] / 17 + [V] 给出了“直线公式”end =“tail”？>，其中[]表示每个元素的数量（质量百分比） 包含在钢板中。 高强度钢板的成型性（特别是伸长率）提高，强度和伸长率之间的平衡优异。

    High-strength cold-rolled steel sheet excellent in workability and shape freezing property
    5.
    发明授权
    High-strength cold-rolled steel sheet excellent in workability and shape freezing property 有权
    高强度冷加工性能优良的冷轧钢板

    公开(公告)号：US08349471B2

    公开(公告)日：2013-01-08

    申请号：US12718397

    申请日：2010-03-05

    申请人： Michitaka Tsunezawa ,  Yuichi Futamura ,  Masaaki Miura

    发明人： Michitaka Tsunezawa ,  Yuichi Futamura ,  Masaaki Miura

    IPC分类号： B32B15/04 ,  B32B15/18 ,  C22C38/00

    CPC分类号： C22C38/00 ,  Y10T428/12799 ,  Y10T428/12972

    摘要： A high-strength cold-rolled steel sheet with improved TS-EL balance, springback value, workability and shape freezing properties having: a steel content including 0.10-0.20 mass % C, 0.5-2.5 mass % Si, 0.5-2.25 mass % Mn, and 0.01-0.10 mass % Al; a structure comprising (A) a mother phase structure of ferrite and (B) a second phase structure of retained austenite optionally including martensite; and satisfying the following expressions (1) and (2): (Vf×Vγ×Cγ×dis)/dia≧300  (1), dis≧1.0 μm  (2); where Vf (%) is the volume fraction of the ferrite, Vγ (%) is the volume fraction of the retained austenite, Cγ (mass %) is the carbon content in the retained austenite, dis (μm) is the shortest distance between the second phase structures, and dia (μm) is the average grain size of the second phase structures.

    摘要翻译： 具有TS-EL平衡，回弹值，可加工性和形状冷冻性能改善的高强度冷轧钢板，其具有：含有0.10-0.20质量％C，0.5-2.5质量％Si，0.5-2.25质量％Mn的钢含量 ，0.01-0.10质量％Al; 包括（A）铁素体的母相结构和（B）任选包括马氏体的残余奥氏体的第二相组织的结构; 满足以下表达式（1）和（2）：（Vf×Vγ×Cγ×dis）/dia≥300（1），dis≥1.0μm（2）; 其中Vf（％）是铁素体的体积分数，Vγ（％）是残留奥氏体的体积分数，Cγ（质量％）是残留奥氏体中的碳含量，dis（μm）是 第二相结构，dia（μm）是第二相结构的平均晶粒尺寸。

    High yield ratio and high-strength hot-dip galvanized steel sheet excellent in workability and production method thereof
    6.
    发明授权
    High yield ratio and high-strength hot-dip galvanized steel sheet excellent in workability and production method thereof 有权
    高产率和高强度热浸镀锌钢板，其加工性和制造方法优异

    公开(公告)号：US08133330B2

    公开(公告)日：2012-03-13

    申请号：US12571753

    申请日：2009-10-01

    申请人： Yuichi Futamura ,  Masaaki Miura

    发明人： Yuichi Futamura ,  Masaaki Miura

    IPC分类号： C21D11/00 ,  C22C38/00

    CPC分类号： C22C38/04 ,  C21D6/001 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0405 ,  C21D8/0447 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/02 ,  C22C38/08 ,  C22C38/16 ,  C22C38/22 ,  C23C2/02 ,  C23C2/28

    摘要： A high-strength hot-dip galvanized steel sheet excellent in workability according to the present invention: contains C, Si, Mn and other elements; has a dual phase structure containing ferrite and martensite as the metallographic structure; and, in the ferrite structure, satisfies the expression 0.2≦(Lb/La)≦1.5 when the length per unit area of the grain boundaries of crystal grains the crystal orientation differences of which are 10 degrees or more is defined as La and the length per unit area of the grain boundaries of crystal grains the crystal orientation differences of which are less than 10 degrees is defined as Lb, and further satisfies the requirements that the average value of D is 25 μm or less and the area ratio of crystal grains satisfying the expression D≦30 μm in the ferrite grains surrounded by the grain boundaries of crystal grains the crystal orientation differences of which are 10 degrees or more is 50% or more when the circle equivalent diameter of each of ferrite grains surrounded by the grain boundaries of crystal grains the crystal orientation differences of which are 10 degrees or more is defined as D; and has a tensile strength of 980 MPa or more.

    摘要翻译： 本发明的加工性优异的高强度热浸镀锌钢板含有C，Si，Mn等元素; 具有含有铁素体和马氏体作为金相结构的双相结构; 并且在铁素体结构中，当晶体取向差为10度以上的晶粒的晶界的每单位面积的长度被定义为La时，铁素体结构满足表达式0.2＆nlE;（Lb / La）＆nlE; 1.5 将晶体取向差小于10度的晶粒的晶界的单位面积的长度定义为Lb，进一步满足D的平均值为25μm以下，晶体的面积比 满足表达式D＆nlE的晶粒;当晶粒包围的铁素体晶体的圆当量直径由晶粒包围的晶体取向差为10度以上时，由晶粒边界包围的铁素体晶体中的30μm为30％以上 其晶体取向差为10度以上的晶粒边界定义为D; 拉伸强度为980MPa以上。

    High-strength cold-rolled steel sheet excellent in bending workability
    7.
    发明授权
    High-strength cold-rolled steel sheet excellent in bending workability 有权
    弯曲加工性优异的高强度冷轧钢板

    公开(公告)号：US08460800B2

    公开(公告)日：2013-06-11

    申请号：US12708109

    申请日：2010-02-18

    申请人： Tetsuji Hoshika ,  Sae Mizuta ,  Yuichi Futamura ,  Masaaki Miura ,  Yukihiro Utsumi ,  Hiroaki Matsumoto ,  Hiroki Ohta

    发明人： Tetsuji Hoshika ,  Sae Mizuta ,  Yuichi Futamura ,  Masaaki Miura ,  Yukihiro Utsumi ,  Hiroaki Matsumoto ,  Hiroki Ohta

    IPC分类号： B32B15/01 ,  B32B15/04 ,  B32B15/18

    CPC分类号： C22C38/04 ,  C22C38/001 ,  C22C38/02 ,  C22C38/06 ,  C22C38/18 ,  Y10T428/12799 ,  Y10T428/12972 ,  Y10T428/2495

    摘要： Disclosed is a cold-rolled steel sheet having a specific steel composition and having a composite steel structure including a ferrite structure and a martensite-containing second phase. In a surface region of the steel sheet from the surface to a depth one-tenth the gage, the number density of n-ary groups of inclusions determined by specific n-th determinations is 120 or less per 100 cm2 of a rolling plane, in which the distance in steel sheet rolling direction between outermost surfaces of two outermost particles of the group of inclusions is 80 μm or more. Also disclosed is a cold-rolled steel sheet having a specific steel composition and having a steel structure of a martensite single-phase structure. In the surface region, the number density of groups of inclusions, in which the distance between the outermost surfaces is 100 μm or more, is 120 or less per 100 cm2 of a rolling plane.

    摘要翻译： 公开了一种具有特定钢组成并具有包括铁素体组织和含马氏体的第二相的复合钢结构的冷轧钢板。 从表面到表面十分之一的钢板的表面区域中，通过特定的第n次测定确定的夹杂物的n元组的数密度为每100平方厘米的轧制平面为120以下， 其中夹杂物组中两个最外层颗粒的最外表面之间的钢板轧制方向的距离为80μm以上。 还公开了具有特定钢组成并具有马氏体单相结构的钢结构的冷轧钢板。 在表面区域中，最外表面之间的距离为100μm以上的夹杂物组的数密度为每100平方厘米的轧制平面为120以下。

    HIGH-STRENGTH COLD-ROLLED STEEL SHEET EXCELLENT IN WORKABILITY AND SHAPE FREEZING PROPERTY
    9.
    发明申请
    HIGH-STRENGTH COLD-ROLLED STEEL SHEET EXCELLENT IN WORKABILITY AND SHAPE FREEZING PROPERTY 有权
    高强度冷轧钢板优良的可加工性和形状冷冻性能

    公开(公告)号：US20100247958A1

    公开(公告)日：2010-09-30

    申请号：US12718397

    申请日：2010-03-05

    申请人： Michitaka TSUNEZAWA ,  Yuichi Futamura ,  Masaaki Miura

    发明人： Michitaka TSUNEZAWA ,  Yuichi Futamura ,  Masaaki Miura

    IPC分类号： C25D5/10 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

    CPC分类号： C22C38/00 ,  Y10T428/12799 ,  Y10T428/12972

    摘要： A high-strength cold-rolled steel sheet according to the present invention: satisfies the requirement of a prescribed chemical composition; has a structure comprising a mother phase structure of ferrite and a second phase structure of retained austenite and martensite (the martensite may not be included); and satisfies the following expressions (1) and (2) when the volume fraction of the ferrite in the whole structure is represented by Vf (%), the volume fraction of the retained austenite in the whole structure is represented by Vγ (%), the carbon content in the retained austenite is represented by Cγ (mass %), the shortest distance between the second phase structures is represented by dis (μm), and the average grain size of the second phase structures is represented by dia (μm), (Vf×Vγ×Cγ×dis)/dia≧300  (1), dis≧1.0 μm  (2). By such a configuration, the improvement of TS-EL balance and the reduction of a springback value are attained in a high strength region of about 550 to 900 MPa class and excellent workability and shape freezing property are obtained.

    摘要翻译： 本发明的高强度冷轧钢板满足规定的化学成分要求; 具有铁素体的母相结构和残留奥氏体和马氏体的第二相结构（不包含马氏体）的结构; 满足下述式（1）和（2），将整个结构体的铁素体的体积分数用Vf（％）表示，整体结构中的残留奥氏体的体积分率由Vγ（％）表示， 残留奥氏体中的碳含量由Cγ（质量％）表示，第二相结构之间的最短距离由dis（μm）表示，第二相结构的平均粒径由dia（μm）表示， （Vf×Vγ×Cγ×dis）/dia≥300（1），dis≥1.0μm（2）。 通过这样的结构，可以在约550〜900MPa等级的高强度区域获得TS-EL平衡的改善和回弹值的降低，并获得优异的加工性和形状冻结性。