公开(公告)号：US08657970B2

公开(公告)日：2014-02-25

申请号：US12934039

申请日：2008-11-12

Applicant: Naoki Yoshinaga ,  Masafumi Azuma ,  Yasuharu Sakuma ,  Naoki Maruyama

Inventor： Naoki Yoshinaga ,  Masafumi Azuma ,  Yasuharu Sakuma ,  Naoki Maruyama

IPC: C22C38/00 ,  C22C38/08 ,  C21D8/02 ,  C22C38/14

CPC classification number: C22C38/14 ,  C21D8/0426 ,  C21D8/0463 ,  C21D9/46 ,  C21D9/48 ,  C21D2211/004 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/02 ,  C23C2/28

Abstract: This hot-rolled steel sheet contains, in terms of mass %, C: 0.015% or more to less than 0.040%; Si: less than 0.05%; Mn: 0.9% or more to 1.8% or less; P: less than 0.02%; S: less than 0.01%; Al: less than 0.1%; N: less than 0.006%; and Ti: 0.05% or more to less than 0.11%, with the remainder being Fe and inevitable impurities, wherein Ti/C is in a range of 2.5 or more to less than 3.5, Nb, Zr, V, Cr, Mo, B and W are not included, a microstructure includes a mixed microstructure of polygonal ferrite and quasi-polygonal ferrite in a proportion of greater than 96%, a maximum tensile strength is 520 MPa or more and less than 720 MPa, an aging index AI is more than 15 MPa, a product of a hole expansion ratio (λ) % and a total elongation (El) % is 2350 or more, and a fatigue limit is 200 MPa or more.

Abstract translation: 该热轧钢板以质量％计含有C：0.015％以上且小于0.040％ Si：小于0.05％; Mn：0.9％以上至1.8％以下; P：小于0.02％; S：小于0.01％; Al：小于0.1％; N：小于0.006％; 和Ti：0.05％以上至小于0.11％，其余为Fe和不可避免的杂质，其中Ti / C在2.5以上且小于3.5的范围内，Nb，Zr，V，Cr，Mo，B 并不包括W，微结构包括多数铁素体和准多边形铁素体的混合微结构，其比例大于96％，最大拉伸强度为520MPa以上且低于720MPa，老化指数AI更多 超过15MPa时，孔膨胀率（λ）％和总伸长率（E1）％的乘积为2350以上，疲劳极限为200MPa以上。

公开(公告)号：US08163108B2

公开(公告)日：2012-04-24

申请号：US12736154

申请日：2009-03-26

Applicant: Masafumi Azuma ,  Naoki Yoshinaga ,  Naoki Maruyama ,  Noriyuki Suzuki ,  Yasuharu Sakuma

Inventor： Masafumi Azuma ,  Naoki Yoshinaga ,  Naoki Maruyama ,  Noriyuki Suzuki ,  Yasuharu Sakuma

IPC: C22C38/00 ,  C22C38/18 ,  C22C38/04 ,  C22C38/14

CPC classification number: C22C38/32 ,  C21D8/0226 ,  C21D8/04 ,  C21D8/0426 ,  C21D8/0436 ,  C21D8/0473 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/002 ,  C22C38/02 ,  C22C38/28 ,  C22C38/38 ,  C23C2/02 ,  C23C2/04 ,  C23C2/26 ,  C23C2/28 ,  Y10T428/12799

Abstract: This cold-rolled steel sheet includes, in terms of mass %, C: not less than 0.05% and not more than 0.095%, Cr: not less than 0.15% and not more than 2.0%, B: not less than 0.0003% and not more than 0.01%, Si: not less than 0.3% and not more than 2.0%, Mn: not less than 1.7% and not more than 2.6%, Ti: not less than 0.005% and not more than 0.14%, P: not more than 0.03%, S: not more than 0.01%, Al: not more than 0.1%, N: less than 0.005%, O: not less than 0.0005% and not more than 0.005%, and contains as the remainder, iron and unavoidable impurities, wherein the microstructure of the steel sheet includes mainly polygonal ferrite having a crystal grain size of not more than 4 μm, and hard microstructures of bainite and martensite, the block size of the martensite is not more than 0.9 μm, the Cr content within the martensite is 1.1 to 1.5 times the Cr content within the polygonal ferrite, and the tensile strength is at least 880 MPa.

Abstract translation: 该冷轧钢板以质量％计含有C：0.05％以上0.095％以下的Cr：0.15％以上2.0％以下，B：0.0003％以上， 0.01％以下，Si：0.3％以上2.0％以下，Mn：1.7％以上2.6％以下，Ti：0.005％以上0.14％以下，P： 不大于0.03％，S：不大于0.01％，Al：不大于0.1％，N：小于0.005％，O：不小于0.0005％，不大于0.005％，其余为铁 和不可避免的杂质，其中钢板的组织主要包括晶粒尺寸不大于4μm的多边形铁素体，贝氏体和马氏体的硬质组织，马氏体的块尺寸不大于0.9μm，Cr 马氏体内的含量为多边形铁素体中的Cr含量的1.1〜1.5倍，拉伸强度为880MPa以上。

公开(公告)号：US10023947B2

公开(公告)日：2018-07-17

申请号：US13508779

申请日：2010-11-30

Applicant: Masafumi Azuma ,  Noriyuki Suzuki ,  Naoki Maruyama ,  Akinobu Murasato ,  Yasuharu Sakuma ,  Hiroyuki Kawata ,  Chisato Wakabayashi

Inventor： Masafumi Azuma ,  Noriyuki Suzuki ,  Naoki Maruyama ,  Akinobu Murasato ,  Yasuharu Sakuma ,  Hiroyuki Kawata ,  Chisato Wakabayashi

IPC: C21D8/00 ,  C22C38/04 ,  C22C38/02 ,  C23C2/06 ,  C21D9/46 ,  C22C38/00 ,  C22C38/06 ,  C23C2/28 ,  C25D5/36 ,  C23C2/40

Abstract: High strength steel plate with an ultimate tensile strength of 900 MPa or more which is excellent in hydrogen embrittlement resistance characterized in that, in the structure of the steel plate, (a) by volume fraction, ferrite is present in 10 to 50%, bainitic ferrite and/or bainite in 10 to 60%, and tempered martensite in 10 to 50%, and (b) iron-based carbides which contain Si or Si and Al in 0.1% or more are present in 4×108 (particles/mm3) or more.

公开(公告)号：US08962149B2

公开(公告)日：2015-02-24

申请号：US13390493

申请日：2010-08-30

Applicant: Hatsuhiko Oikawa ,  Hideki Hamatani ,  Masafumi Azuma ,  Noriyuki Suzuki ,  Fuminori Watanabe ,  Naoki Maruyama ,  Hiroyuki Kawata

Inventor： Hatsuhiko Oikawa ,  Hideki Hamatani ,  Masafumi Azuma ,  Noriyuki Suzuki ,  Fuminori Watanabe ,  Naoki Maruyama ,  Hiroyuki Kawata

IPC: B32B15/01 ,  B32B15/04 ,  B32B15/18 ,  B23K11/11 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  B23K11/16

CPC classification number: B23K11/115 ,  B23K11/16 ,  B23K11/166 ,  B23K2101/18 ,  B23K2101/34 ,  B23K2103/04 ,  B32B15/011 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  Y10T428/12347 ,  Y10T428/12965

Abstract: Provided is a spot welded joint (10) which includes at least one thin steel plate with a tensile strength of 750 MPa to 1850 MPa and a carbon equivalent Ceq of equal to or more than 0.22 mass % to 0.55 mass % and in which a nugget (3) is formed in an interface of the thin steel plates (1A, 1B). In a nugget outer layer zone, a microstructure consists of a dendrite structure in which an average value of arm intervals is equal to or less than 12 μm, an average grain diameter of carbides contained in the microstructure is 5 nm to 100 nm, and a number density of carbides is equal to or more than 2×106/mm2.

Abstract translation: 提供了一种点焊接头（10），其包括至少一个拉伸强度为750MPa至1850MPa的薄钢板和等于或大于0.22质量％至0.55质量％的碳当量Ceq，并且其中熔核 （3）形成在薄钢板（1A，1B）的界面中。 在熔核外层区域中，微观组织由臂间隔的平均值等于或小于12μm的枝晶结构构成，微观结构中所含的碳化物的平均粒径为5nm〜100nm， 碳化物的数密度等于或大于2×10 6 / mm 2。

公开(公告)号：US20140178712A1

公开(公告)日：2014-06-26

申请号：US14236371

申请日：2012-08-08

Applicant: Naoki Maruyama ,  Naoki Yoshinaga ,  Masafumi Azuma ,  Yasuharu Sakuma ,  Atsushi Itami

Inventor： Naoki Maruyama ,  Naoki Yoshinaga ,  Masafumi Azuma ,  Yasuharu Sakuma ,  Atsushi Itami

IPC: C22C38/50 ,  C22C38/48 ,  C22C38/42 ,  C22C38/16 ,  C22C38/00 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C21D8/02 ,  C22C38/14

CPC classification number: C22C38/50 ,  C21D8/0263 ,  C21D8/0426 ,  C21D8/0473 ,  C21D8/0484 ,  C21D9/56 ,  C21D2211/002 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/42 ,  C22C38/48 ,  C23C2/02 ,  Y10T428/12972

Abstract: Hot rolled steel sheet which has a maximum tensile strength of 600 MPa or more and has an excellent low temperature impact energy absorption and HAZ softening resistance and a method of production of the same are provided, that is, sheet which contains, by mass %, C: 0.04 to 0.09%, Si: 0.4% or less, Mn: 1.2 to 2.0%, P: 0.1% or less, S: 0.02% or less, Al: 1.0% or less, Nb: 0.02 to 0.09%, Ti: 0.02 to 0.07%, and N: 0.005% or less, where 2.0≦Mn+8[% Ti]+12[% Nb]≦2.6, has a balance of Fe and unavoidable impurities, has an area percentage of pearlite of 5% or less, has a total area percentage of martensite and retained austenite of 0.5% or less, has a balance of a metal structure of ferrite and/or bainite, has an average grain size of ferrite and bainite of 10 μm or less, has an average particle size of alloy carbonitrides with incoherent interfaces which contain Ti and Nb of 20 nm or less, and has a yield ratio of 0.85 or more.

Abstract translation: 具有最大抗张强度为600MPa以上且具有优异的低温冲击能量吸收和HAZ耐软化性的热轧钢板及其制造方法，即以质量％计， C：0.04〜0.09％，Si：0.4％以下，Mn：1.2〜2.0％，P：0.1％以下，S：0.02％以下，Al：1.0％以下，Nb：0.02〜0.09％，Ti ：0.02〜0.07％，N：0.005％以下，其中2.0＆nlE; Mn + 8 [％Ti] +12 [％Nb]＆nlE; 2.6，其余为Fe和不可避免的杂质，具有珠光体的面积百分比 为5％以下，具有0.5％以下的马氏体和残留奥氏体的总面积百分比，铁素体和/或贝氏体的金属结构的平衡，铁素体和贝氏体的平均粒径为10μm以下 具有包含Ti和Nb为20nm以下的非相干界面的合金碳氮化物的平均粒径，并且屈服比为0.85以上。

公开(公告)号：US20110024004A1

公开(公告)日：2011-02-03

申请号：US12736417

申请日：2009-04-09

Applicant: Masafumi Azuma ,  Noriyuki Suzuki ,  Naoki Maruyama ,  Naoki Yoshinaga ,  Akinobu Murasato

Inventor： Masafumi Azuma ,  Noriyuki Suzuki ,  Naoki Maruyama ,  Naoki Yoshinaga ,  Akinobu Murasato

IPC: C21D8/02 ,  C22C38/00 ,  C22C38/18 ,  C22C38/16 ,  C22C38/08

CPC classification number: C23C2/28 ,  C21D8/0236 ,  C21D8/0273 ,  C21D9/46 ,  C21D9/48 ,  C21D2201/05 ,  C21D2211/004 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C23C2/02 ,  C23C2/06

Abstract: The invention is directed to providing, for application in automobiles, construction materials, household appliances and the like, high-strength sheets excellent in formability properties such as hole expansibility and ductility, and also in fatigue resistance, characterized in comprising, in specified contents expressed in mass %, C, Si, Mn, P, S, Al, N and O and a balance of iron and unavoidable impurities, and having a steel sheet structure composed mainly of ferrite and hard structures, a crystal orientation difference between some ferrite adjacent to hard structures and the hard structures of less than 9°, and a maximum tensile strength of 540 MPa or greater.

Abstract translation: 本发明旨在提供在汽车，建筑材料，家用电器等中的应用，具有优异的成型性能如扩孔性和延展性以及耐疲劳性的高强度片材，其特征在于，在特定内容中表达 以质量％计，C，Si，Mn，P，S，Al，N和O以及铁和不可避免的杂质的平衡，并且具有主要由铁素体和硬质结构组成的钢板结构，一些铁素体相邻的晶体取向差异 硬结构和硬结构小于9°，最大拉伸强度为540MPa或更大。

公开(公告)号：US20090272467A1

公开(公告)日：2009-11-05

申请号：US12456120

申请日：2009-06-10

Applicant: Nobuhiro Fujita ,  Masafumi Azuma ,  Manabu Takahashi ,  Yasuhide Morimoto ,  Masao Kurosaki ,  Akihiro Miyasaka

Inventor： Nobuhiro Fujita ,  Masafumi Azuma ,  Manabu Takahashi ,  Yasuhide Morimoto ,  Masao Kurosaki ,  Akihiro Miyasaka

IPC: C23C2/02 ,  C23C2/06

CPC classification number: C23C2/40 ,  C23C2/02 ,  C23C2/28 ,  Y10S428/939 ,  Y10T428/12799

Abstract: The present invention provides: a high-strength high-ductility hot-dip galvanized steel sheet and hot-dip galvannealed steel sheet having high fatigue resistance and corrosion resistance; a high-strength hot-dip galvanized steel sheet excellent in ductility, which improves non-plating defects and plating adhesion after severe deformation, and a method of producing the same; a high-strength and high-ductility hot-dip galvanized steel sheet having high fatigue resistance and corrosion resistance; a high-strength hot-dip galvanized steel sheet and hot-dip galvannealed steel sheet having superior appearance and workability, which suppresses the generation of non-plating defects, and a method of producing the same; and a high-strength hot-dip galvannealed steel sheet and a high-strength hot-dip galvanized steel sheet, which suppress non-plating defects and surface defects and have both corrosion resistance, in particular corrosion resistance in an environment containing chlorine ion, and high ductility, and a method of producing the same.

Abstract translation: 本发明提供：具有高耐疲劳性和耐腐蚀性的高强度高延展性热浸镀锌钢板和热浸镀锌钢板; 延展性优异的高强度热浸镀锌钢板及其制造方法，其改善了非电镀缺陷和电镀附着力。 具有高耐疲劳性和耐腐蚀性的高强度和高延展性热浸镀锌钢板; 具有优异的外观和加工性的高强度热浸镀锌钢板和热浸镀锌钢板，其抑制非电镀缺陷的产生及其制造方法。 以及抑制非电镀缺陷和表面缺陷并且在含有氯离子的环境中具有耐腐蚀性，特别是耐腐蚀性的高强度热浸镀锌锌钢板和高强度热浸镀锌钢板，以及 高延展性及其制造方法。

公开(公告)号：US20080035247A1

公开(公告)日：2008-02-14

申请号：US11893935

申请日：2007-08-16

Applicant: Nobuhiro Fujita ,  Masafumi Azuma ,  Manabu Takahashi ,  Yasuhide Morimoto ,  Masao Kurosaki ,  Akihiro Miyasaka

Inventor： Nobuhiro Fujita ,  Masafumi Azuma ,  Manabu Takahashi ,  Yasuhide Morimoto ,  Masao Kurosaki ,  Akihiro Miyasaka

IPC: C21D9/46 ,  B22D25/02 ,  C22C38/00

CPC classification number: C23C2/40 ,  C23C2/02 ,  C23C2/28 ,  Y10S428/939 ,  Y10T428/12799

Abstract: The present invention provides: a high-strength high-ductility hot-dip galvanized steel sheet and hot-dip galvannealed steel sheet having high fatigue resistance and corrosion resistance; a high-strength hot-dip galvanized steel sheet excellent in ductility, which improves non-plating defects and plating adhesion after severe deformation, and a method of producing the same; a high-strength and high-ductility hot-dip galvanized steel sheet having high fatigue resistance and corrosion resistance; a high-strength hot-dip galvanized steel sheet and hot-dip galvannealed steel sheet having superior appearance and workability, which suppresses the generation of non-plating defects, and a method of producing the same; and a high-strength hot-dip galvannealed steel sheet and a high-strength hot-dip galvanized steel sheet, which suppress non-plating defects and surface defects and have both corrosion resistance, in particular corrosion resistance in an environment containing chlorine ion, and high ductility, and a method of producing the same.

Abstract translation: 本发明提供：具有高耐疲劳性和耐腐蚀性的高强度高延展性热浸镀锌钢板和热浸镀锌钢板; 延展性优异的高强度热浸镀锌钢板及其制造方法，其改善了非电镀缺陷和电镀附着力。 具有高耐疲劳性和耐腐蚀性的高强度和高延展性热浸镀锌钢板; 具有优异的外观和加工性的高强度热浸镀锌钢板和热浸镀锌钢板，其抑制非电镀缺陷的产生及其制造方法。 以及抑制非电镀缺陷和表面缺陷并且在含有氯离子的环境中具有耐腐蚀性，特别是耐腐蚀性的高强度热浸镀锌锌钢板和高强度热浸镀锌钢板，以及 高延展性及其制造方法。

公开(公告)号：US09109275B2

公开(公告)日：2015-08-18

申请号：US13392455

申请日：2010-08-31

Applicant: Yasuhide Morimoto ,  Nobuhiro Fujita ,  Akihiro Miyasaka ,  Kazuhiko Honda ,  Masafumi Azuma ,  Noriyuki Suzuki ,  Toshiki Nonaka

Inventor： Yasuhide Morimoto ,  Nobuhiro Fujita ,  Akihiro Miyasaka ,  Kazuhiko Honda ,  Masafumi Azuma ,  Noriyuki Suzuki ,  Toshiki Nonaka

IPC: C23C2/28 ,  C23C2/06 ,  B22D11/115 ,  C21D1/74 ,  C21D1/76 ,  C21D9/46 ,  C22C18/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/26 ,  B32B15/01 ,  C22C38/12 ,  C22C38/14 ,  C22C7/00 ,  B22D27/02 ,  B32B15/00

CPC classification number: C23C2/06 ,  B22D11/115 ,  B32B15/013 ,  C21D1/74 ,  C21D1/76 ,  C21D9/46 ,  C21D2211/004 ,  C22C18/04 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C23C2/02 ,  C23C2/26 ,  Y10T428/12799

Abstract: Provided is a galvanized steel sheet having a tensile strength of 770 MPa or more including a steel sheet portion, and a plated layer formed on the surface of the steel sheet portion, in which the plated layer is a galvanized plated layer or an galvannealed plated layer, the steel sheet portion has a soft layer that directly adjoins the interface with the plated layer and an inside layer that is other than the soft layer, the thickness D of soft layer is 0.001% to 5% of thickness t of the steel sheet portion, and, when the hardness of the soft layer measured by nano-indentation method is indicated by H1, and the representative hardness of the steel sheet portion measured by the nano-indentation method is indicated by Ha in cross section that goes along the thickness direction of the steel sheet portion, H1 is 5% to 75% of Ha.

Abstract translation: 本发明提供一种抗拉强度为770MPa以上的镀锌钢板，其特征在于，包括钢板部，以及形成在钢板部的表面上的镀层，镀层为镀锌层或镀锌层 钢板部具有与镀层的界面直接相邻的软层和软质层以外的内层，软质层的厚度D为钢板部的厚度t的0.001〜5％ ，并且当通过纳米压痕法测量的软质层的硬度由H1表示时，通过纳米压痕法测量的钢板部分的代表性硬度由沿着厚度方向的横截面Ha表示 的钢板部分，H1为Ha的5〜75％。

公开(公告)号：US20110017360A1

公开(公告)日：2011-01-27

申请号：US12934039

申请日：2008-11-12

Applicant: Naoki Yoshinaga ,  Masafumi Azuma ,  Yasuharu Sakuma ,  Naoki Maruyama

Inventor： Naoki Yoshinaga ,  Masafumi Azuma ,  Yasuharu Sakuma ,  Naoki Maruyama

IPC: C21D8/02 ,  C22C38/00 ,  B32B15/01 ,  C22C38/02 ,  C22C38/04

CPC classification number: C22C38/14 ,  C21D8/0426 ,  C21D8/0463 ,  C21D9/46 ,  C21D9/48 ,  C21D2211/004 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/02 ,  C23C2/28

Abstract: This hot-rolled steel sheet contains, in terms of mass%, C: 0.015% or more to less than 0.040%; Si: less than 0.05%; Mn: 0.9% or more to 1.8% or less; P: less than 0.02%; S: less than 0.01%; Al: less than 0.1%; N: less than 0.006%; and Ti: 0.05% or more to less than 0.11%, with the remainder being Fe and inevitable impurities, wherein Ti/C is in a range of 2.5 or more to less than 3.5, Nb, Zr, V, Cr, Mo, B and W are not included, a microstructure includes a mixed microstructure of polygonal ferrite and quasi-polygonal ferrite in a proportion of greater than 96%, a maximum tensile strength is 520 MPa or more and less than 720 MPa, an aging index AI is more than 15 MPa, a product of a hole expansion ratio (A) % and a total elongation (El) % is 2350 or more, and a fatigue limit is 200 MPa or more.

Abstract translation: 该热轧钢板以质量％计含有C：0.015％以上且小于0.040％ Si：小于0.05％; Mn：0.9％以上至1.8％以下; P：小于0.02％; S：小于0.01％; Al：小于0.1％; N：小于0.006％; 和Ti：0.05％以上至小于0.11％，其余为Fe和不可避免的杂质，其中Ti / C在2.5以上且小于3.5的范围内，Nb，Zr，V，Cr，Mo，B 并不包括W，微结构包括多数铁素体和准多边形铁素体的混合微结构，其比例大于96％，最大拉伸强度为520MPa以上且低于720MPa，老化指数AI更多 孔膨胀率（A）％和总伸长率（E1）％的乘积为15MPa以上，疲劳极限为200MPa以上。