公开(公告)号：US08597439B2

公开(公告)日：2013-12-03

申请号：US12640229

申请日：2009-12-17

Applicant: Shushi Ikeda ,  Yoichi Mukai ,  Hiroshi Akamizu ,  Koichi Makii ,  Koichi Sugimoto ,  Shunichi Hashimoto ,  Kenji Saito

Inventor： Shushi Ikeda ,  Yoichi Mukai ,  Hiroshi Akamizu ,  Koichi Makii ,  Koichi Sugimoto ,  Shunichi Hashimoto ,  Kenji Saito

IPC: C22C38/12

CPC classification number: C22C38/02 ,  C22C38/04 ,  C22C38/12

Abstract: A high-strength cold rolled steel sheet contains:0.10 to 0.28% of C,1.0 to 2.0% of Si,1.0 to 3.0% of Mn, and0.03 to 0.10% of Nb in terms of % by mass,Al is controlled to 0.5 or less, P is controlled to 0.15% or less, and S is controlled to 0.02% or less, and residual austenite accounts for 5 to 20%, bainitic ferrite accounts for 50% or more, and polygonal ferrite accounts for 30% or less (containing 0%), of the entire structure, and a mean number of residual austenite blocks is 20 or more as determined when the random area (15 μm×15 μm) is observed by EBSP (electron back scatter diffraction pattern).

Abstract translation: 高强度冷轧钢板包含：以质量％计，C：0.10〜0.28％，Si：1.0〜2.0％，Mn：1.0〜3.0％，Nb：0.03〜0.10％，Al： 以下，P为0.15％以下，S为0.02％以下，残留奥氏体为5〜20％，贝氏体铁素体为50％以上，多边形铁素体为30％以下 （含有0％），并且当通过EBSP（电子背散射衍射图）观察到随机面积（15mum×15mum））时，残留奥氏体块的平均数为20以上。

公开(公告)号：US06306527B1

公开(公告)日：2001-10-23

申请号：US09685096

申请日：2000-10-11

Applicant: Shushi Ikeda ,  Koichi Makii ,  Yosuke Shindo ,  Shunichi Hashimoto ,  Takahiro Kashima ,  Hiroshi Akamizu ,  Masahiro Nomura

Inventor： Shushi Ikeda ,  Koichi Makii ,  Yosuke Shindo ,  Shunichi Hashimoto ,  Takahiro Kashima ,  Hiroshi Akamizu ,  Masahiro Nomura

IPC: B32B1518

CPC classification number: C23C2/40 ,  C21D1/185 ,  C21D8/0273 ,  C21D2211/005 ,  C21D2211/008 ,  C23C2/02 ,  Y10S428/939 ,  Y10T428/12799

Abstract: A hot-dip galvanized steel sheet which is produced from a cold-rolled steel sheet, as a base steel sheet, consisting essentially of C: 0.010-0.06 wt %, Si: no more than 0.5 wt %, Mn: no less than 0.5 wt % and less than 2.0 wt %, P: no more than 0.20 wt %, S: no more than 0.01 wt %, Al: 0.005-0.10 wt %, N: no more than 0.005 wt %, Cr: no more than 1.0 wt %, Mn+1.3Cr: 1.9-2.3 wt %, Fe: remainder, and having a structure composed of ferrite and a second phase containing martensite, said second phase in the structure accounting for no more than 20% in terms of area and martensite in the second phase accounting for no less than 50%, and which has a zinc-plated layer formed on the surface thereof by hot-dip galvanizing or hot-dip galvannealing. A process for production of said hot-dip galvanized steel sheet. This steel sheet has a composite structure containing martensite and yet it has a low strength (no higher than 500 MPa) and also has good strength-ductility balance.

Abstract translation: 一种由冷轧钢板作为基本钢板制成的热浸镀锌钢板，其基本上由C：0.010-0.06重量％，Si：不大于0.5重量％，Mn：不小于0.5 重量％且小于2.0重量％，P：不大于0.20重量％，S：不大于0.01重量％，Al：0.005-0.10重量％，N：不大于0.005重量％，Cr：不大于1.0 重量％，Mn + 1.3Cr：1.9-2.3重量％，Fe：余量，并且具有由铁素体构成的结构和含有马氏体的第二相，所述结构中的所述第二相占面积不大于20％ 第二相中的马氏体不低于50％，并且通过热浸镀锌或热浸镀锌合金在其表面形成有镀锌层。 一种生产所述热浸镀锌钢板的方法。 该钢板具有包含马氏体的复合结构，但其强度低（不高于500MPa），并且还具有良好的强度 - 延展性平衡。

公开(公告)号：US09074272B2

公开(公告)日：2015-07-07

申请号：US11910029

申请日：2006-03-28

Applicant: Hiroshi Akamizu ,  Yoichi Mukai ,  Shushi Ikeda ,  Koichi Sugimoto

Inventor： Hiroshi Akamizu ,  Yoichi Mukai ,  Shushi Ikeda ,  Koichi Sugimoto

IPC: C22C38/04 ,  C22C38/02 ,  C21D8/02

CPC classification number: C22C38/04 ,  C21D8/0236 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C22C38/02

Abstract: A high-strength cold-rolled steel sheet excellent in uniform elongation, including in percent by mass: 0.10-0.28% of C; 1.0-2.0% of Si; and 1.0-3.0% of Mn, and the structures of the same having the space factors below to the entire structure: 30-65% of bainitic ferrite; 30-50% of polygonal ferrite; and 5-20% of residual austenite.

Abstract translation: 均匀伸长率优异的高强度冷轧钢板，以质量％计：0.10〜0.28％ 1.0-2.0％的Si; 和1.0-3.0％的Mn，其结构相对于整个结构的空间因子低：贝氏体铁素体的30-65％; 30-50％的多边形铁素体; 和5-20％的残余奥氏体。

公开(公告)号：US20090242085A1

公开(公告)日：2009-10-01

申请号：US12477299

申请日：2009-06-03

Applicant: Shushi IKEDA ,  Koichi Makii ,  Hiroshi Akamizu

Inventor： Shushi IKEDA ,  Koichi Makii ,  Hiroshi Akamizu

IPC: C21D8/02 ,  C22C38/00

CPC classification number: C21D1/20 ,  C21D8/02 ,  C21D8/0426 ,  C21D8/0436 ,  C21D8/0473 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12

Abstract: A dual phase steel sheet with good bake-hardening properties is provided. The steel sheet is characterized in containing (in terms of percent by mass) C: no less than 0.06% and less than 0.25%; Si+Al: 0.5 to 3%; Mn: 0.5 to 3%; P: no more than 0.15%; and S: no more than 0.02%; and also meeting the following condition (in terms of space factor) that retained austenite is at least 3%, bainite is at least 30%, and ferrite is no more than 50%, and further characterized in differing in stress larger than 50 MPa before and after application of 2% pre-strain and ensuing heat treatment for paint baking at 170° C. for 20 minutes. The steel sheet has well-balanced strength and workability, exhibits good bake-hardening properties at the time of paint baking, and offers good resistance to natural aging.

Abstract translation: 提供了具有良好烘烤硬化性能的双相钢板。 钢板的特征在于含有（以质量％计）C：不小于0.06％且小于0.25％; Si + Al：0.5〜3％ Mn：0.5〜3％ P：不超过0.15％; S：不大于0.02％; 并且还满足以下条件（以空间因子计），残留奥氏体为3％以上，贝氏体为30％以上，铁素体为50％以下，其特征在于应力大于50MPa以下 并在施加2％预应变之后，并在170℃下进行油漆烘烤20分钟。 钢板具有平衡的强度和加工性，在烤漆时具有良好的烘烤硬化性能，并且具有良好的耐自然老化性。

公开(公告)号：US20090238713A1

公开(公告)日：2009-09-24

申请号：US12159400

申请日：2006-12-28

Applicant: Junichiro Kinugasa ,  Fumio Yuse ,  Yoichi Mukai ,  Shinji Kozuma ,  Hiroshi Akamizu ,  Kouji Kasuya ,  Muneaki Ikeda ,  Koichi Sugimoto

Inventor： Junichiro Kinugasa ,  Fumio Yuse ,  Yoichi Mukai ,  Shinji Kozuma ,  Hiroshi Akamizu ,  Kouji Kasuya ,  Muneaki Ikeda ,  Koichi Sugimoto

IPC: C22C38/00 ,  C22C38/42 ,  C22C38/22 ,  C22C38/18 ,  C22C38/20 ,  C22C38/40 ,  C22C38/04

CPC classification number: C21D9/48 ,  C21D1/20 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/005 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/50

Abstract: The invention relates to an ultrahigh-strength thin steel sheet excellent in the hydrogen embrittlement resistance, the steel sheet including, by weight %, 0.10 to 0.60% of C, 1.0 to 3.0% of Si, 1.0 to 3.5% of Mn, 0.15% or less of P, 0.02% or less of S, 1.5% or less of Al, 0.003 to 2.0% of Cr, and a balance including iron and inevitable impurities; in which grains of residual austenite have an average axis ratio (major axis/minor axis) of 5 or more, the grains of the residual austenite have an average minor axis length of 1 μm or less, and the grains of the residual austenite have a nearest-neighbor distance between the grains of 1 μm or less.

Abstract translation: 本发明涉及耐氢脆性优异的超高强度薄钢板，该钢板以重量％计，C：0.10〜0.60％，Si：1.0〜3.0％，Mn：1.0〜3.5％，Mn：0.15％ 以下的P，0.02％以下的S，1.5％以下的Al，0.003〜2.0％的Cr，余量包括铁和不可避免的杂质; 其中残余奥氏体的晶粒的平均轴比（长轴/短轴）为5以上，残留奥氏体的平均短轴长度为1μm以下，残留奥氏体的晶粒为 1个或更少的颗粒之间的最邻近距离。

公开(公告)号：US07553380B2

公开(公告)日：2009-06-30

申请号：US11541748

申请日：2006-10-03

Applicant: Shushi Ikeda ,  Hiroshi Akamizu ,  Shunichi Hashimoto ,  Takahiro Kashima ,  Tatsuya Asai

Inventor： Shushi Ikeda ,  Hiroshi Akamizu ,  Shunichi Hashimoto ,  Takahiro Kashima ,  Tatsuya Asai

IPC: C22C38/04 ,  C22C38/06 ,  C21D8/00

CPC classification number: C22C38/38 ,  C21D1/185 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/04 ,  C22C38/06

Abstract: Disclosed is a dual-phase steel sheet having low yield ratio, excellent in the balance for strength-elongation and for strength-stretch flange formability, and also excellent in bake hardening property containing (on the mass % basis). C: 0.01-0.20%, Si: 0.5% or less, Mn: 0.5-3%, sol.Al: 0.06% or less (inclusive 0%), P: 0.15% or less (exclusive 0%), and S: 0.02% or less (inclusive 0″), and in which the matrix phase contains tempered martensite; tempered martensite and ferrite; tempered bainite; or tempered bainite and ferrite, and the second phase comprises 1 to 30% of martensite at an area ratio based on the entire structure.

Abstract translation: 公开了低屈服比，强度伸长率和强度拉伸凸缘成形性的平衡优异的双相钢板，并且含有（以质量％计）的烘烤硬化性也优异。 C：0.01-0.20％，Si：0.5％以下，Mn：0.5〜3％，sol.Al：0.06％以下（含0％），P：0.15％以下（不含0％），S： 0.02％以下（含0“），基质相含有回火马氏体; 回火马氏体和铁素体; 回火贝氏体; 或回火贝氏体和铁素体，并且第二相以基于整个结构的面积比为1〜30％的马氏体。

公开(公告)号：US07833363B2

公开(公告)日：2010-11-16

申请号：US11874516

申请日：2007-10-18

Applicant: Shushi Ikeda ,  Koichi Makii ,  Hiroshi Akamizu ,  Yoichi Mukai ,  Koh-ichi Sugimoto

Inventor： Shushi Ikeda ,  Koichi Makii ,  Hiroshi Akamizu ,  Yoichi Mukai ,  Koh-ichi Sugimoto

IPC: C21D8/00

CPC classification number: C22C38/02 ,  C21D7/13 ,  C21D8/005 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/008 ,  C22C38/04 ,  C22C38/06

Abstract: A high-strength forged part is disclosed which comprises a base phase structure, comprising 30% or more of ferrite in terms of a space factor, and a second phase structure, comprising bainite and/or martensite, and retained austenite having an average gain diameter of 5 μm or less and a content represented by 50X[C]

Abstract translation: 公开了一种高强度锻造部件，其包括基本相结构，其包含基于空间因子的铁素体的30％以上，以及包含贝氏体和/或马氏体的第二相结构和具有平均增益直径的残余奥氏体 为50×[C] <[VγR] <150×[C]表示的含量，[VγR]表示残留奥氏体的空间因子（γR），[C]表示C的质量％ 锻造部分。 此外，公开了一种高强度锻造部件，其包括基本相结构，其包含基于空间因子的回火贝氏体或回火马氏体的50％以上，以及包含马氏体和3％至30％保留的第二相结构 奥氏体以空间因子计，其中纵横比为2以下的残留奥氏体和马氏体的部分在空间因子方面为25％以下。

公开(公告)号：US07767036B2

公开(公告)日：2010-08-03

申请号：US11910013

申请日：2006-03-29

Applicant: Takahiro Kashima ,  Yoichi Mukai ,  Hiroshi Akamizu ,  Koichi Sugimoto

Inventor： Takahiro Kashima ,  Yoichi Mukai ,  Hiroshi Akamizu ,  Koichi Sugimoto

IPC: C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  B32B15/01

CPC classification number: C22C38/02 ,  C21D6/00 ,  C21D6/002 ,  C21D8/0405 ,  C21D8/0426 ,  C21D8/0436 ,  C21D8/0447 ,  C21D9/46 ,  C21D9/48 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C22C38/04 ,  C22C38/06 ,  C23C2/02 ,  C23C2/06 ,  Y10T428/12799

Abstract: A high-strength cold-rolled steel sheet exhibiting an excellent strength-workability balance, including in percent by mass: 0.10-0.25% of C; 1.0-2.0% of Si; 1.5-3.0% of Mn; 0.01% or less (not including 0%) of P; 0.005% or less (not including 0%) of S; 0.01-3.0% of Al; and remaining part consisting of iron and inevitable impurities, wherein the space factor of bainitic ferrite to the entire structure is 70% or more, the space factor of residual austenite to the entire structure is 5-20%, the hardness (HV) is 270 or greater, and the half-value width of an X-ray diffraction peak on a (200)-surface of α-iron is 0.220 degrees or smaller.

Abstract translation: 表现出优异的强度加工性平衡的高强度冷轧钢板，包括质量百分比：0.10-0.25％的C; 1.0-2.0％的Si; 1.5-3.0％的Mn; 0.01％以下（不含0％）P; 0.005％以下（不含0％）S; 0.01-3.0％的Al; 剩余部分由铁和不可避免的杂质组成，其中贝氏体铁素体对整个结构的空间因子为70％以上，残余奥氏体相对于整个结构的空间因子为5-20％，硬度（HV）为270 以上，α铁的（200）面的X射线衍射峰的半值宽度为0.220度以下。

公开(公告)号：US07591977B2

公开(公告)日：2009-09-22

申请号：US11044185

申请日：2005-01-28

Applicant: Shushi Ikeda ,  Hiroshi Akamizu ,  Koichi Makii ,  Yoichi Mukai ,  Koichi Sugimoto

Inventor： Shushi Ikeda ,  Hiroshi Akamizu ,  Koichi Makii ,  Yoichi Mukai ,  Koichi Sugimoto

IPC: C22C38/02 ,  C22C38/04 ,  C22C38/06

CPC classification number: C21D9/52 ,  C21D1/20 ,  C21D8/0273 ,  C21D2211/001 ,  C21D2211/002

Abstract: To provide a high strength and low yield ratio cold rolled steel sheet having high elongation property and high flange drawing property, or a plated steel sheet made by plating the same. The high strength and low yield ratio cold rolled steel sheet or the plated steel sheet made by plating the same has such a constitution as 0.10 to 0.25% of C, 1.0 to 2.0% of Si and 1.5 to 3.0% of Mn, are contained in terms of weight percentage, while other elements are controlled such as Al within 0.2%, P within 0.15% and S within 0.02%, with residual austenite occupying at least 5%, bainitic ferrite occupying at least 60% (preferably 80% or more), and polygonal ferrite within 20% (containing 0%), so that a tensile strength is 980 MPa or higher, while an elongation (El in %), a flange drawing property (λin %), a tensile strength (TS in MPa) and a yield strength (YP in MPa) satisfy the following inequality (1): [(El ×λ×TS)/YP]≧645.

Abstract translation: 为了提供具有高伸长率和高法兰拉拔性能的高强度和低屈服比的冷轧钢板，或通过电镀其制成的镀覆钢板。 高强度低屈服比的冷轧钢板或通过电镀钢板制成的镀覆钢板具有C：0.10〜0.25％，Si：1.0〜2.0％，Mn：1.5〜3.0％ 贝氏体铁素体占据至少60％（优选为80％以上）的贝氏体铁素体，而其他元素则控制在Al的0.2％以内，P在0.15％以内，S在0.02％以内，残留奥氏体占5％ ，多边形铁素体为20％以下（含有0％），拉伸强度为980MPa以上，伸长率（El％），凸缘拉伸性能（兰德因数％），拉伸强度（MPa） 屈服强度（YP，MPa）满足以下不等式（1）：[（El×lambdaxTS）/ YP]> = 645。

公开(公告)号：US20090145310A1

公开(公告)日：2009-06-11

申请号：US12330830

申请日：2008-12-09

Applicant: Hiroshi AKAMIZU ,  Jiro Iwaya

Inventor： Hiroshi AKAMIZU ,  Jiro Iwaya

IPC: B30B13/00

CPC classification number: B21D19/08 ,  B21D22/02 ,  Y10T29/49622 ,  Y10T29/49627

Abstract: The invention provides a press forming method which can prevent a stretch-flange crack while using conventional press forming equipment, at a time of press forming a formed member with flange. The method of the invention is characterized by a shape of a blank for press forming, and a blank in accordance with the invention is constructed by a base body blank portion corresponding to a flat base body of the formed member, and a concave flange blank portion formed by bending on a concave outer peripheral edge of the base body blank portion. The concave blank portion is constituted by a convex flange blank portion in which a stretch-flange deformation is generated, and an adjacent flange blank portion which is adjacent thereto. An outer peripheral edge of the convex flange blank portion is formed such that one end exists between c and e on a profile line corresponding to an outer peripheral edge of the adjacent flange blank portion, the other end exists between d and f, and the one end and the other end are smoothly connected between the straight lines cd and ef, as shown in FIG. 6.

Abstract translation: 本发明提供一种冲压成型方法，其可以在使用常规压制成形设备时，在用法兰压制成型件时，防止拉伸凸缘裂纹。 本发明的方法的特征在于用于压制成型的坯料的形状，根据本发明的坯件由对应于成形构件的平坦基体的基体坯件部分和凹形凸缘坯料部分构成 通过在基体坯料部分的凹入的外周边缘上弯曲而形成。 凹形坯料部分由凸缘凸缘部分形成，其中产生拉伸凸缘变形，以及相邻的凸缘坯料部分。 形成凸凸缘坯料部分的外周边缘，使其一端存在于与相邻凸缘坯料部分的外周边缘对应的轮廓线上的c与e之间，另一端存在于d与f之间 端部和另一端平滑地连接在直线cd和ef之间，如图3所示。 6。