公开(公告)号：US20130048161A1

公开(公告)日：2013-02-28

申请号：US13583407

申请日：2011-02-28

Applicant: Hiroshi Matsuda ,  Yoshimasa Funakawa ,  Yasushi Tanaka

Inventor： Hiroshi Matsuda ,  Yoshimasa Funakawa ,  Yasushi Tanaka

IPC: C21D8/02 ,  C22C38/04 ,  C22C38/38 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/02 ,  C22C38/06

CPC classification number: C21D8/0247 ,  C21D1/22 ,  C21D8/0205 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

Abstract: A high strength press-formed member includes a steel sheet constituting the member including a composition including by mass %, C: 0.12% to 0.69%, Si: 3.0% or less, Mn: 0.5% to 3.0%, P: 0.1% or less, S: 0.07% or less, Al: 3.0% or less, N: 0.010% or less, Si+Al: at least 0.7%, and remainder as Fe and incidental impurities, wherein a microstructure of the steel sheet includes martensite, retained martensite, and bainite containing bainitic ferrite, an area ratio of said martensite with respect to the entire microstructure of the steel sheet is 10% to 85%, at least 25% of said martensite is tempered martensite, content of retained austenite is 5% to 40%, area ratio of said bainitic ferrite in said bainite with respect to the entire microstructure of the steel sheet is at least 5%, total of area ratios of said martensite, said retained austenite, and said bainitic ferrite in said bainite with respect to the entire microstructure of the steel sheet is at least 65%, and average carbon concentration in the retained austenite is at least 0.65 mass %.

Abstract translation: 高强度压力成形构件包括构成该构件的钢板，该钢板包括质量％C：0.12％〜0.69％，Si：3.0％以下，Mn：0.5〜3.0％，P：0.1％ S：0.07％以下，Al：3.0％以下，N：0.010％以下，Si + Al：0.7％以上，剩余部分作为Fe和附带杂质，其中，钢板的显微组织包括马氏体， 所含马氏体的贝氏体含有贝氏体铁素体，所述马氏体相对于钢板整体的面积比为10％〜85％，所述马氏体的回弹马氏体的至少25％为回火马氏体，残留奥氏体含量为5％ 至所述贝氏体中所述贝氏体铁素体相对于钢板整体的面积比至少为40％，所述贝氏体中的所述马氏体，所述残留奥氏体和所述贝氏体铁素体的面积率为所述贝氏体的面积率的至少5％ 钢板的整个微观结构至少为65％，平均碳浓度为 残留奥氏体中的残留率为0.65质量％以上。

公开(公告)号：US20110146852A1

公开(公告)日：2011-06-23

申请号：US13060115

申请日：2009-09-04

Applicant: Hiroshi Matsuda ,  Yoshimasa Funakawa ,  Yasushi Tanaka

Inventor： Hiroshi Matsuda ,  Yoshimasa Funakawa ,  Yasushi Tanaka

IPC: C23C2/02 ,  C21D8/02 ,  C23C2/28 ,  C23C2/06 ,  C22C38/18 ,  C22C38/00 ,  C22C38/16 ,  C22C38/08 ,  B32B15/01

CPC classification number: C22C38/04 ,  C21D6/00 ,  C21D8/0205 ,  C21D8/04 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/02 ,  C22C38/06 ,  C23C2/02 ,  C23C2/28

Abstract: A high-strength steel sheet has good ductility and stretch-flangeability and has a tensile strength (TS) of 980 MPa or more. The steel sheet contains 0.17%-0.73% C, 3.0% or less Si, 0.5%-3.0% Mn, 0.1% or less P, 0.07% or less S, 3.0% or less Al, and 0.010% or less N, in which Si+Al is 0.7% or more.

Abstract translation: 高强度钢板具有良好的延展性和拉伸凸缘性，拉伸强度（TS）为980MPa以上。 该钢板含有0.17％〜0.73％C，3.0％以下Si，0.5％-3.0％Mn，0.1％以下P，0.07％以下S，3.0％以下Al和0.010％以下N Si + Al为0.7％以上。

公开(公告)号：US20110030854A1

公开(公告)日：2011-02-10

申请号：US12865527

申请日：2009-01-29

Applicant: Hiroshi Matsuda ,  Reiko Mizuno ,  Yoshimasa Funakawa ,  Yasushi Tanaka ,  Tatsuya Nakagaito ,  Saiji Matsuoka

Inventor： Hiroshi Matsuda ,  Reiko Mizuno ,  Yoshimasa Funakawa ,  Yasushi Tanaka ,  Tatsuya Nakagaito ,  Saiji Matsuoka

IPC: C21D11/00 ,  C22C38/00 ,  C21D8/02 ,  C22C38/04 ,  C22C38/18 ,  C22C38/12 ,  C22C38/02 ,  C22C37/06 ,  C22C38/60

CPC classification number: C23C2/06 ,  C21D1/25 ,  C21D6/005 ,  C21D8/0426 ,  C21D8/0436 ,  C21D8/0447 ,  C21D8/0468 ,  C21D2211/002 ,  C21D2211/004 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/04 ,  C23C2/02 ,  C23C2/28

Abstract: A high strength steel sheet has a tensile strength of 900 MPa or higher that can achieve both high strength and good formability and a composition including, on a mass basis, C: 0.1% or more and 0.3% or less; Si: 2.0% or less; Mn: 0.5% or more and 3.0% or less; P: 0.1% or less; S: 0.07% or less; Al: 1.0% or less; and N: 0.008% or less, with the balance Fe and incidental impurities. The steel sheet microstructure includes, on an area ratio basis, 5% or more and 80% or less of ferrite, 15% or more of autotempered martensite, 10% or less of bainite, 5% or less of retained austenite, and 40% or less of as-quenched martensite; the mean hardness of the autotempered martensite is HV≦700; and the mean number of precipitated iron-based carbide grains each having a size of 5 nm or more and 0.5 μm or less and included in the autotempered martensite is 5×104 or more per 1 mm2.

Abstract translation: 高强度钢板的拉伸强度为900MPa以上，能够实现高强度和良好的成形性，并且以质量计含有C：0.1％以上且0.3％以下的组合物。 Si：2.0％以下; Mn：0.5％以上3.0％以下， P：0.1％以下; S：0.07％以下 Al：1.0％以下; N：0.008％以下，余量为Fe和杂质。 钢板微结构以面积比为基准，5％以上且80％以下的铁素体，15％以上的自回火马氏体，10％以下的贝氏体，5％以下的残留奥氏体和40质量％ 或更少的淬火马氏体; 自回火马氏体的平均硬度为HV＆nlE; 700; 并且包含在自回火马氏体中的尺寸为5nm以上且0.5μm以下的析出铁素体的平均粒子数为5×104以上。

公开(公告)号：US20130133786A1

公开(公告)日：2013-05-30

申请号：US13583295

申请日：2011-02-28

Applicant: Hiroshi Matsuda ,  Yoshimasa Funakawa ,  Yasushi Tanaka

Inventor： Hiroshi Matsuda ,  Yoshimasa Funakawa ,  Yasushi Tanaka

IPC: C21D6/00 ,  C23C2/02

CPC classification number: C21D6/008 ,  C21D1/22 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D8/00 ,  C21D8/02 ,  C21D8/0205 ,  C21D9/46 ,  C21D2211/002 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/02 ,  C23C2/28

Abstract: A method for manufacturing a high strength steel sheet includes heating a steel sheet containing at least 0.10 mass % of carbon to either a temperature in an austenite single phase region or a temperature in an (austenite+ferrite) two-phase region; cooling the steel sheet to a cooling stop temperature as a target temperature set within a cooling temperature region ranging from Ms to (Ms−150° C.) to allow a portion of non-transformed austenite to proceed to martensitic transformation; retaining a coldest part in a sheet widthwise direction of the steel sheet at a temperature in a temperature range from the cooling stop temperature as the target temperature to (the cooling stop temperature+15° C.) for 15 seconds to 100 seconds; and heating the sheet to a temperature to temper said martensite, wherein “Ms” represents martensitic transformation start temperature and said cooling temperature region is exclusive of Ms and inclusive of (Ms−150° C.).

Abstract translation: 一种高强度钢板的制造方法包括将奥氏体单相区域的温度或（奥氏体+铁素体）两相区域的温度为至少0.10质量％的碳钢的钢板进行加热; 将钢板冷却至冷却停止温度，作为设定在Ms〜（Ms-150℃）以下的冷却温度范围内的目标温度，使一部分未转化奥氏体进行马氏体相变; 在从作为目标温度的冷却停止温度到（冷却停止温度+ 15℃）的温度范围内的温度下，在钢板的宽度方向上保持最冷部分15秒至100秒; 并将片材​​加热至回火马氏体的温度，其中“Ms”表示马氏体相变开始温度，所述冷却温度区域不包括Ms，（Ms-150℃）。

公开(公告)号：US20130087253A1

公开(公告)日：2013-04-11

申请号：US13583013

申请日：2011-02-28

Applicant: Hiroshi Matsuda ,  Yoshimasa Funakawa ,  Yasushi Tanaka

Inventor： Hiroshi Matsuda ,  Yoshimasa Funakawa ,  Yasushi Tanaka

IPC: C21D8/02 ,  C23C2/02 ,  C22C38/00 ,  C22C38/34 ,  C22C38/02 ,  C22C38/38 ,  C22C38/40 ,  C22C38/58 ,  C22C38/20 ,  C22C38/24 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  B32B15/01

CPC classification number: C21D8/0205 ,  B32B15/013 ,  C21D1/22 ,  C21D6/002 ,  C21D6/005 ,  C21D8/0226 ,  C21D8/0236 ,  C21D9/46 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/40 ,  C22C38/58 ,  C23C2/02 ,  C23C2/28

Abstract: A high strength steel sheet has tensile strength of at least 1470 MPa and (tensile strength×total elongation) of at least 29000 MPa·% with a composition including, by mass %, C: 0.30% to 0.73%, Si: 3.0% or less, Al: 3.0% or less, Si+Al: at least 0.7%, Cr: 0.2% to 8.0%, Mn: 10.0% or less, Cr+Mn: at least 1.0%, P: 0.1% or less, S: 0.07% or less, N: 0.010% or less, and remainder as Fe and incidental impurities; and processing the steel sheet such that microstructure satisfies area ratio of martensite with respect to the microstructure of 15% to 90%; content of retained austenite of 10% to 50%; at least 50% of the martensite is constituted of tempered martensite and area ratio of the tempered martensite with respect to the microstructure is at least 10%; and area ratio of polygonal ferrite with respect to the microstructure is 10% or less.

Abstract translation: 高强度钢板的拉伸强度为至少1470MPa，（拉伸强度×总伸长率）为29000MPa·％以上，按质量％计含有C：0.30〜0.73％，Si：3.0％ 少于Al：3.0％以下，Si + Al：0.7％以上，Cr：0.2〜8.0％，Mn：10.0％以下，Cr + Mn：1.0％以上，P：0.1％以下，S ：0.07％以下，N：0.010％以下，剩余部分为Fe及杂质; 并且对钢板进行处理，使得微结构满足马氏体相对于微观结构的面积比为15〜90％。 残余奥氏体含量为10％〜50％; 至少50％的马氏体由回火马氏体构成，回火马氏体相对于微观结构的面积比为10％以上。 多边形铁素体相对于微结构的面积率为10％以下。

公开(公告)号：US20110048589A1

公开(公告)日：2011-03-03

申请号：US12865542

申请日：2009-01-29

Applicant: Hiroshi Matsuda ,  Reiko Mizuno ,  Yoshimasa Funakawa ,  Yasushi Tanaka

Inventor： Hiroshi Matsuda ,  Reiko Mizuno ,  Yoshimasa Funakawa ,  Yasushi Tanaka

IPC: C21D8/02 ,  C22C38/04 ,  C22C38/26 ,  C22C38/32 ,  C22C38/14

CPC classification number: C23C2/06 ,  C21D1/18 ,  C21D8/04 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/02 ,  C23C2/28

Abstract: An ultra-high strength steel sheet has a tensile strength of 1400 MPa or higher that can achieve both high strength and good formability and an advantageous method for manufacturing the steel sheet and includes a composition including, on a mass basis C: 0.12% or more and 0.50% or less; Si: 2.0% or less; Mn: 1.0% or more and 5.0% or less; P: 0.1% or less; S: 0.07% or less; Al: 1.0% or less; and N: 0.008% or less, with the balance Fe and incidental impurities. The steel microstructure includes, on an area ratio basis, 80% or more of autotempered martensite, less than 5% of ferrite, 10% or less of bainite, and 5% or less of retained austenite; and the mean number of precipitated iron-based carbide grains each having a size of 5 nm or more and 0.5 μm or less and included in the autotempered martensite is 5×104 or more per 1 mm2.

Abstract translation: 超高强度钢板的拉伸强度为1400MPa以上，能够实现高强度和良好的成形性，并且制造钢板的优选方法包括以质量计C：0.12％以上的组合物 和0.50％以下; Si：2.0％以下; Mn：1.0％以上且5.0％以下; P：0.1％以下; S：0.07％以下; Al：1.0％以下; N：0.008％以下，余量为Fe和杂质。 所述钢微观结构以面积比为基准，具有80％以上的自回火马氏体，小于5％的铁素体，10％以下的贝氏体和5％以下的残留奥氏体， 并且包含在自回火马氏体中的尺寸为5nm以上且0.5μm以下的析出铁素体的平均粒子数为5×104以上。

公开(公告)号：US08992697B2

公开(公告)日：2015-03-31

申请号：US13583407

申请日：2011-02-28

Applicant: Hiroshi Matsuda ,  Yoshimasa Funakawa ,  Yasushi Tanaka

Inventor： Hiroshi Matsuda ,  Yoshimasa Funakawa ,  Yasushi Tanaka

IPC: C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/38 ,  C21D8/06 ,  C21D8/02 ,  C21D1/22 ,  C21D9/46 ,  C22C38/00

CPC classification number: C21D8/0247 ,  C21D1/22 ,  C21D8/0205 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

Abstract: A high strength press-formed member includes a steel sheet constituting the member including a composition including by mass %, C: 0.12% to 0.69%, Si: 3.0% or less, Mn: 0.5% to 3.0%, P: 0.1% or less, S: 0.07% or less, Al: 3.0% or less, N: 0.010% or less, Si+Al: at least 0.7%, and remainder as Fe and incidental impurities, wherein a microstructure of the steel sheet includes martensite, retained martensite, and bainite containing bainitic ferrite, an area ratio of said martensite with respect to the entire microstructure of the steel sheet is 10% to 85%, at least 25% of said martensite is tempered martensite, content of retained austenite is 5% to 40%, area ratio of said bainitic ferrite in said bainite with respect to the entire microstructure of the steel sheet is at least 5%, total of area ratios of said martensite, said retained austenite, and said bainitic ferrite in said bainite with respect to the entire microstructure of the steel sheet is at least 65%, and average carbon concentration in the retained austenite is at least 0.65 mass %.

Abstract translation: 高强度压力成形构件包括构成该构件的钢板，该钢板包括质量％C：0.12％〜0.69％，Si：3.0％以下，Mn：0.5〜3.0％，P：0.1％ S：0.07％以下，Al：3.0％以下，N：0.010％以下，Si + Al：0.7％以上，剩余部分作为Fe和附带杂质，其中，钢板的显微组织包括马氏体， 所含马氏体的贝氏体含有贝氏体铁素体，所述马氏体相对于钢板整体的面积比为10％〜85％，所述马氏体的回弹马氏体的至少25％为回火马氏体，残留奥氏体含量为5％ 至所述贝氏体中所述贝氏体铁素体相对于钢板整体的面积比至少为40％，所述贝氏体中的所述马氏体，所述残留奥氏体和所述贝氏体铁素体的面积率为所述贝氏体的面积率的至少5％ 钢板的整个微观结构至少为65％，平均碳浓度为 残留奥氏体中的残留率为0.65质量％以上。

公开(公告)号：US09200343B2

公开(公告)日：2015-12-01

申请号：US13583013

申请日：2011-02-28

Applicant: Hiroshi Matsuda ,  Yoshimasa Funakawa ,  Yasushi Tanaka

Inventor： Hiroshi Matsuda ,  Yoshimasa Funakawa ,  Yasushi Tanaka

IPC: C21D1/22 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/40 ,  C22C38/58 ,  C23C2/02 ,  C23C2/28 ,  B32B15/01

CPC classification number: C21D8/0205 ,  B32B15/013 ,  C21D1/22 ,  C21D6/002 ,  C21D6/005 ,  C21D8/0226 ,  C21D8/0236 ,  C21D9/46 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/34 ,  C22C38/38 ,  C22C38/40 ,  C22C38/58 ,  C23C2/02 ,  C23C2/28

Abstract: A high strength steel sheet has tensile strength of at least 1470 MPa and (tensile strength ×total elongation) of at least 29000 MPa·% with a composition including, by mass %, C.: 0.30% to 0.73%, Si: 3.0% or less, Al: 3.0% or less, Si+Al: at least 0.7%, Cr: 0.2% to 8.0%, Mn: 10.0% or less, Cr+Mn: at least 1.0%, P: 0.1% or less, S: 0.07% or less, N: 0.010% or less, and remainder as Fe and incidental impurities; and processing the steel sheet such that microstructure satisfies area ratio of martensite with respect to the microstructure of 15% to 90%; content of retained austenite of 10% to 50%; at least 50% of the martensite is constituted of tempered martensite and area ratio of the tempered martensite with respect to the microstructure is at least 10%; and area ratio of polygonal ferrite with respect to the microstructure is 10% or less.

Abstract translation: 高强度钢板的拉伸强度为至少1470MPa，（拉伸强度×总伸长率）为29000MPa·％以上，质量％为0.30质量％〜0.73％，Si：3.0％ 以下，Al：3.0％以下，Si + Al：0.7％以上，Cr：0.2〜8.0％，Mn：10.0％以下，Cr + Mn：1.0％以上，P：0.1％ S：0.07％以下，N：0.010％以下，余量为Fe及杂质; 并且对钢板进行处理，使得微结构满足马氏体相对于微观结构的面积比为15〜90％。 残余奥氏体含量为10％〜50％; 至少50％的马氏体由回火马氏体构成，回火马氏体相对于微观结构的面积比为10％以上。 多边形铁素体相对于微结构的面积率为10％以下。

公开(公告)号：US09121087B2

公开(公告)日：2015-09-01

申请号：US13060115

申请日：2009-09-04

Applicant: Hiroshi Matsuda ,  Yoshimasa Funakawa ,  Yasushi Tanaka

Inventor： Hiroshi Matsuda ,  Yoshimasa Funakawa ,  Yasushi Tanaka

IPC: C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60 ,  C22C38/00 ,  C21D6/00 ,  C21D8/02 ,  C21D8/04 ,  C21D9/46 ,  C23C2/02 ,  C23C2/28

CPC classification number: C22C38/04 ,  C21D6/00 ,  C21D8/0205 ,  C21D8/04 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/02 ,  C22C38/06 ,  C23C2/02 ,  C23C2/28

Abstract: A high-strength steel sheet has good ductility and stretch-flangeability and has a tensile strength (TS) of 980 MPa or more. The steel sheet contains 0.17%-0.73% C, 3.0% or less Si, 0.5%-3.0% Mn, 0.1% or less P, 0.07% or less S, 3.0% or less Al, and 0.010% or less N, in which Si+Al is 0.7% or more.

Abstract translation: 高强度钢板具有良好的延展性和拉伸凸缘性，拉伸强度（TS）为980MPa以上。 该钢板含有0.17％〜0.73％C，3.0％以下Si，0.5％-3.0％Mn，0.1％以下P，0.07％以下S，3.0％以下Al和0.010％以下N Si + Al为0.7％以上。

公开(公告)号：US08840834B2

公开(公告)日：2014-09-23

申请号：US12865542

申请日：2009-01-29

Applicant: Hiroshi Matsuda ,  Reiko Mizuno ,  Yoshimasa Funakawa ,  Yasushi Tanaka

Inventor： Hiroshi Matsuda ,  Reiko Mizuno ,  Yoshimasa Funakawa ,  Yasushi Tanaka

IPC: C22C38/04 ,  C21D8/02 ,  C22C38/14

CPC classification number: C23C2/06 ,  C21D1/18 ,  C21D8/04 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/02 ,  C23C2/28

Abstract: An ultra-high strength steel sheet has a tensile strength of 1400 MPa or higher that can achieve both high strength and good formability and an advantageous method for manufacturing the steel sheet and includes a composition including, on a mass basis C: 0.12% or more and 0.50% or less; Si: 2.0% or less; Mn: 1.0% or more and 5.0% or less; P: 0.1% or less; S: 0.07% or less; Al: 1.0% or less; and N: 0.008% or less, with the balance Fe and incidental impurities. The steel microstructure includes, on an area ratio basis, 80% or more of autotempered martensite, less than 5% of ferrite, 10% or less of bainite, and 5% or less of retained austenite; and the mean number of precipitated iron-based carbide grains each having a size of 5 nm or more and 0.5 μm or less and included in the autotempered martensite is 5×104 or more per 1 mm2.

Abstract translation: 超高强度钢板的拉伸强度为1400MPa以上，能够实现高强度和良好的成形性，并且制造钢板的优选方法包括以质量计C：0.12％以上的组合物 和0.50％以下; Si：2.0％以下; Mn：1.0％以上且5.0％以下; P：0.1％以下; S：0.07％以下; Al：1.0％以下; 和N：0.008％以下，余量为Fe和杂质。 所述钢微观结构以面积比为基准，具有80％以上的自回火马氏体，小于5％的铁素体，10％以下的贝氏体和5％以下的残留奥氏体， 并且包含在自回火马氏体中的尺寸为5nm以上且0.5μm以下的析出铁素体的平均粒子数为5×104以上。