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1.发明公开
公开(公告)号：EP3828298A1
公开(公告)日：2021-06-02
申请号：EP19873058.2
申请日：2019-08-06
发明人： HIRASHIMA Takuya , ONO Yoshihiko
IPC分类号： C22C38/00 , C21D9/46 , C22C38/06 , C22C38/60 , C21D1/19 , C21D1/22 , C21D8/02 , C21D8/04 , C21D9/48 , C22C38/02 , C22C38/04 , C25D3/22 , C25D5/00 , C21D6/00 , C21D6/02 , C22C38/12 , C22C38/14 , C22C38/32 , C22C38/34 , C22C38/38 , C22C38/16
摘要： An object is to provide a high-yield-ratio high-strength electrogalvanized steel sheet having excellent bendability and a method for manufacturing the steel sheet.
A high-yield-ratio high-strength electrogalvanized steel sheet having an electrogalvanized coating layer formed on a surface of a base steel sheet, in which the base steel sheet has a chemical composition containing, by mass%, C: 0.14% or more and 0.40% or less, Si: 0.001% or more and 2.0% or less, Mn: 0.10% or more and 1.70% or less, P: 0.05% or less, S: 0.0050% or less, Al: 0.01% or more and 0.20% or less, N: 0.010% or less, and a balance of Fe and inevitable impurities, a steel microstructure, in which a total area fraction of one or both of bainite containing carbides having an average grain diameter of 50 nm or less and tempered martensite containing carbides having an average grain diameter of 50 nm or less is 90% or more in the whole of the steel microstructure, and in which a total area fraction of one or both of bainite containing carbides having an average grain diameter of 50 nm or less and tempered martensite containing carbides having an average grain diameter of 50 nm or less is 80% or more in a region from the surface of the base steel sheet to a position located at 1/8 of a thickness of the base steel sheet, and diffusible hydrogen in steel in an amount of 0.20 mass ppm or less.-
公开(公告)号：EP3971308A1
公开(公告)日：2022-03-23
申请号：EP20805261.3
申请日：2020-05-12
发明人： HIRASHIMA Takuya , KANEKO Shinjiro
摘要： An object of the present invention is to provide a high strength member having excellent delayed fracture resistance, a method for manufacturing the high strength member, and a method for manufacturing a steel sheet for the high strength member.
A high strength member 10 according to the present invention is the high strength member 10 having a bending ridge line portion 12 formed from a steel sheet 11, the member having a tensile strength of 1470 MPa or higher, a residual stress of 300 MPa or lower in an end surface 13 of the bending ridge line portion 12, and a Vickers hardness (HV) of 200 or higher and 450 or lower in the end surface 13 of the bending ridge line portion 12.-
公开(公告)号：EP3409807B1
公开(公告)日：2020-03-04
申请号：EP17744285.2
申请日：2017-01-26
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公开(公告)号：EP3875625A1
公开(公告)日：2021-09-08
申请号：EP19880423.9
申请日：2019-09-25
摘要： An object of the present invention is to provide a high-strength member having excellent delayed fracture resistance, a method for manufacturing a high-strength member, and a method for manufacturing a steel sheet for a high-strength member.
A high-strength member 10 of the present invention having a bent ridge portion 12 obtained by using a steel sheet 11 has a tensile strength of 1470 MPa or more; an edge surface 13 of the bent ridge portion 12 has a residual stress of 800 MPa or less; and a longest crack among cracks that extend from the edge surface 13 of the bent ridge portion 12 in a bent ridge direction D1 has a length of 10 µm or less.-
公开(公告)号：EP3875623A1
公开(公告)日：2021-09-08
申请号：EP19878653.5
申请日：2019-09-25
摘要： An object of the present invention is to provide a high-strength steel sheet having high delayed fracture resistance and a method for manufacturing the high-strength steel sheet.
A high-strength steel sheet according to the present invention has a predetermined element composition. Relative to the whole microstructure of the steel sheet, the total area fraction of one or two of bainite containing carbide grains having an average grain size of 50 nm or less and martensite containing carbide grains having an average grain size of 50 nm or less is 90% or more. The average number of inclusions having an average grain size of 5 µm or more that are present in a section perpendicular to a rolling direction is 5.0/mm 2 or less.-
公开(公告)号：EP3744869A1
公开(公告)日：2020-12-02
申请号：EP19743740.3
申请日：2019-01-24
发明人： HIRASHIMA Takuya , ONO Yoshihiko
IPC分类号： C22C38/00 , C21D9/46 , C22C38/06 , C22C38/54 , C21D8/02 , C22C38/02 , C22C38/04 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/18 , C23C2/02
摘要： Provided are a high-ductility high-strength steel sheet having excellent close-contact bendability and a production method thereof.
The steel sheet has a specific component composition adjusted and a steel microstructure containing, by an area percentage, 50% or more of a ferrite phase, 5% to 30% of a pearlite phase, and 15% or less in total of bainite, martensite, and retained austenite, in which the area percentage of ferrite grains each containing three or more cementite grains having an aspect ratio of 1.5 or less is 30% or less, and the number of inclusions having a particle size of 10 µm or more present in a portion extending from a surface to a 1/4 thickness position is 2.0 particles/mm 2 or less.-
公开(公告)号：EP3409807A1
公开(公告)日：2018-12-05
申请号：EP17744285.2
申请日：2017-01-26
发明人： YOSHITOMI Hiromi , HIRASHIMA Takuya , MASUOKA Hiroyuki , TSUDA Seisuke , KOBA Masaki , NISHIMURA Yasuhiro , NAKAGAITO Tatsuya
CPC分类号： C23C2/02 , B32B15/013 , C21D8/0226 , C21D8/0236 , C21D8/0247 , C21D8/0442 , C21D9/46 , C21D9/561 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C22C18/04 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/48 , C22C38/50 , C22C38/54 , C22C38/58 , C22C38/60 , C23C2/06 , C23C2/26 , C23C2/28 , C23C2/40
摘要： Provided are a high-yield-ratio high-strength galvanized steel sheet that includes a Mn-containing steel sheet serving as a base material and that has high yield strength, good coating appearance, good corrosion resistance, and good exfoliation resistance during severe forming, and a production method therefor.
The high-yield-ratio high-strength galvanized steel sheet includes a steel sheet having a specific composition and a metallographic structure including, by area percentage, 20% or less ferrite, 40% or more in total of bainite and tempered martensite, and 60% or less as-quenched martensite, the bainite having an average grain size of 6.0 µm or less, and a coated layer arranged on the steel sheet, the coated layer having a coating weight per side of 20 to 120 g/m 2 and having a Mn content of 0.05 g/m 2 or less, in which the high-yield-ratio high-strength galvanized steel sheet has a yield ratio of 65% or more and a tensile strength of 950 MPa or more.-
公开(公告)号：EP4001447A1
公开(公告)日：2022-05-25
申请号：EP20856777.6
申请日：2020-08-25
发明人： HIRASHIMA Takuya , YOSHIOKA Shimpei , KANEKO Shinjiro , YOSHIMOTO Soshi , HASHIMUKAI Tomohiro , ONO Yoshihiko
摘要： An object of the present invention is to provide a steel sheet and a member that have a high strength, excellent shape uniformity, and excellent delayed fracture resistance and methods for producing the steel sheet and the member.
A steel sheet according to the present invention includes a steel microstructure including, by area, martensite: 20% or more and 100% or less, ferrite: 0% or more and 80% or less, and the balance: 5% or less. A residual stress generated at the transverse center of the steel sheet when the steel sheet is subjected to a V-bending process is 800 MPa or less. A residual stress generated at the transverse end of the steel sheet when the steel sheet is subjected to a V-bending process is 90% or more and 110% or less of the residual stress generated at the transverse center of the steel sheet. The maximum amount of warpage of the steel sheet sheared to a length of 1 m in the longitudinal direction is 15 mm or less.-
公开(公告)号：EP3919637A1
公开(公告)日：2021-12-08
申请号：EP19912317.5
申请日：2019-12-19
IPC分类号： C21D9/46 , C22C38/00 , C22C38/06 , C22C38/58 , C21D8/02 , C21D8/04 , C22C38/02 , C22C38/04 , C23C2/06 , C23C2/40 , C21D6/00
摘要： Provided are a high-strength steel sheet having a low yield ratio and a method for producing the same. In the present invention, a high-strength steel sheet has a chemical composition containing, in mass%, C: 0.06% or greater and 0.120% or less, Si: 0.3% or greater and 0.7% or less, Mn: 1.6% or greater and 2.2% or less, P: 0.05% or less, S: 0.0050% or less, Al: 0.01% or greater and 0.20% or less, and N: 0.010% or less, with the balance being Fe and incidental impurities, and the high-strength steel sheet has a microstructure in which ferrite is present as a major phase, and martensite is present in an area fraction of 10% or greater and less than 50% relative to an area of an entirety of the microstructure, wherein the martensite has an average grain diameter of 3.0 µm or less; in an entirety of the martensite, a proportion of martensite having an aspect ratio of 3 or less is 60% or greater; and the martensite having an aspect ratio of 3 or less has a carbon concentration of 0.30% or greater and 0.90% or less in mass%.
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10.发明公开
公开(公告)号：EP3828299A1
公开(公告)日：2021-06-02
申请号：EP19873988.0
申请日：2019-08-06
发明人： HIRASHIMA Takuya , KANEKO Shinjiro
IPC分类号： C22C38/00 , C21D9/46 , C22C38/06 , C22C38/60 , C21D1/19 , C21D1/22 , C21D8/02 , C21D8/04 , C21D9/48 , C22C38/02 , C22C38/04 , C25D3/22 , C25D5/00 , C21D6/00 , C21D6/02 , C25D5/50 , C22C38/12 , C22C38/14 , C22C38/32 , C22C38/34 , C22C38/38 , C22C38/16
摘要： Provided are a high-ductility, high-strength electrolytic zinc-based coated steel sheet having excellent bendability and a method for producing the same.
A high-ductility, high-strength electrolytic zinc-based coated steel sheet includes an electrolytic zinc-based coating on a surface of a base steel sheet, in which the base steel sheet has a predetermined component composition and a steel microstructure in which the total area percentage of one or two of martensite containing a carbide having an average particle size of 50 nm or less and bainite containing a carbide having an average particle size of 50 nm or less is 90% or more in the entire steel microstructure, the total area percentage of one or two of the martensite containing a carbide having an average particle size of 50 nm or less and the bainite containing a carbide having an average particle size of 50 nm or less is 80% or more in a region extending from the surface of the base steel sheet to a depth of 1/8 of the thickness of the base steel sheet, and the total perimeter of individual carbide particles having an average particle size of 50 nm or less in the martensite containing a carbide having an average particle size of 50 nm or less and the bainite containing a carbide having an average particle size of 50 nm or less present in the region is 50 µm/mm 2 or more, in which the amount of diffusible hydrogen in steel is 0.20 ppm or less by mass.
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