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1. 发明公开

EP3868909A1 THIN STEEL SHEET AND METHOD FOR MANUFACTURING SAME 审中-公开
公开(公告)号：EP3868909A1
公开(公告)日：2021-08-25
申请号：EP19874333.8
申请日：2019-10-15
申请人： JFE Steel Corporation
发明人： KOHSAKA Noriaki , TOBATA Junya , KANEKO Shinjiro , KITANI Yasushi , ONO Yoshihiko , CHIBA Tadachika
IPC分类号： C22C38/00 , C21D9/46 , C22C38/06 , C21D1/19 , C21D1/22 , C21D1/25 , C21D6/00 , C21D8/02 , C21D8/04 , C21D9/48 , C22C38/02 , C22C38/04 , C22C38/12 , C22C38/14 , C22C38/60
摘要： A thin steel sheet having a tensile strength of 980 MPa or higher and good formability is provided, and a method for manufacturing the same is provided.
A thin steel sheet has a specific chemical composition. The thin steel sheet has a microstructure in which ferrite is present in an area fraction of 4% or less (including 0%), as-quenched martensite is present in an area fraction of 10% or less (including 0%), retained austenite is present in an amount of 7% or more and 20% or less, and upper bainite, lower bainite, and tempered martensite are present in a total area fraction of more than 71% and less than 93%; and BCC iron that has a misorientation of 1° or less and surrounds retained austenite having an equivalent circular diameter of 1 µm or less is present in an area fraction of 4% or more and 50% or less, and BCC iron that has a misorientation of more than 1° is present in an area fraction of 25% or more and 85% or less.

2. 发明公开

EP3845674A1 STEEL SHEET AND MANUFACTURING METHOD THEREFOR 审中-公开
公开(公告)号：EP3845674A1
公开(公告)日：2021-07-07
申请号：EP19874690.1
申请日：2019-10-16
申请人： JFE Steel Corporation
发明人： ONO Yoshihiko , TOBATA Junya , AKIMOTO Hiroyuki , MATSUI Yoichiro , KANEKO Shinjiro
IPC分类号： C21D9/46 , C22C38/00 , C22C38/06 , C22C38/60
摘要： A steel sheet and a method for producing the steel sheet are provided. The present invention provides a steel sheet with a specific composition, wherein a steel microstructure contains ferrite: 5% by area percentage or less, a microstructure composed of one or two or more of upper bainite, fresh martensite, tempered martensite, lower bainite, and retained γ: 95% to 100% by area percentage, and retained γ: 5% to 20% by volume percentage, retained γ UB with a grain width in the range of 0.25 to 0.60 µm, a grain length in the range of 1.0 to 15 µm, and an aspect ratio in the range of 3.1 to 25 has an area percentage S γUB in the range of 0.2% to 7.0%, retained γ LB with a grain width in the range of 0.08 to 0.24 µm, a grain length in the range of 0.6 to 15 µm, and an aspect ratio in the range of 4 to 40 has a distribution number N γLB in the range of 10 to 120 per 100 µm 2 , fresh martensite with an equivalent circular grain diameter of 0.5 µm or more and less than 1.3 µm and an aspect ratio of 3 or less and/or retained γ grains with an equivalent circular grain diameter of 0.5 µm or more and less than 1.3 µm and an aspect ratio of 3 or less has a total area percentage S γFine in the range of 1% to 10%, and fresh martensite with an equivalent circular grain diameter in the range of 1.5 to 20 µm and an aspect ratio of 3 or less and/or retained γ grains with an equivalent circular grain diameter in the range of 1.5 to 20 µm and an aspect ratio of 3 or less have a total area percentage S γBlock of 5% or less (including 0%).

3. 发明公开

EP3981892A1 HIGH-STRENGTH STEEL SHEET, HIGH-STRENGTH MEMBER, AND METHODS RESPECTIVELY FOR PRODUCING THESE PRODUCTS 有权
公开(公告)号：EP3981892A1
公开(公告)日：2022-04-13
申请号：EP20848649.8
申请日：2020-07-29
申请人： JFE Steel Corporation
发明人： HIRASHIMA Takuya , HASHIMOTO Yu , KANEKO Shinjiro , ONO Yoshihiko
IPC分类号： C21D9/46 , C22C38/00 , C22C38/14 , C22C38/58
摘要： Issues of the present invention are to provide a high strength steel sheet and a high strength member having high yield ratio and excellent material uniformity, and methods for manufacturing the same.
The high strength steel sheet of the present invention has a specific chemical composition, and contains, in terms of area fraction relative to an entire steel microstructure, 30% or more and 100% or less ferrite, 0% or more and 70% or less martensite, and less than 20% in total of pearlite, bainite and retained austenite, a total content of Nb and Ti contained in a precipitate having a particle size of smaller than 20 nm is 25 mass ppm or more and 220 mass ppm or less, and the difference between the maximum value and the minimum value of the total content of Nb and Ti contained in the precipitate having a particle size of smaller than 20 nm, in the longitudinal direction of the steel sheet, is smaller than 20 mass ppm.

4. 发明授权

EP3508601B1 HIGH-STRENGTH STEEL PLATE AND PRODUCTION METHOD THEREOF 有权
公开(公告)号：EP3508601B1
公开(公告)日：2020-03-18
申请号：EP17846479.8
申请日：2017-08-29
申请人： JFE Steel Corporation
发明人： MINAMI Hidekazu , KANEKO Shinjiro , SUGIHARA Reiko , TAHARA Kazunori , MORI Kazuma
IPC分类号： C22C38/00 , C21D9/46 , C22C38/04 , C22C38/60 , C21D8/02 , C21D1/18 , C21D1/20 , C21D1/25 , C22C38/02 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/34 , C22C38/38 , C23C2/06 , C22C38/36 , C23C2/00

5. 发明公开

EP3584342A1 HIGH-STRENGTH STEEL PLATE AND METHOD FOR MANUFACTURING SAME 有权
公开(公告)号：EP3584342A1
公开(公告)日：2019-12-25
申请号：EP18754114.9
申请日：2018-02-09
申请人： JFE Steel Corporation
发明人： MINAMI Hidekazu , KOBAYASHI Takashi , KANEKO Shinjiro , TANAKA Yuji
IPC分类号： C22C38/00 , C21D9/46 , C22C38/06 , C22C38/60 , C23C2/02 , C22C18/04
摘要： There are provided a high-strength steel sheet and a method for producing the high-strength steel sheet. The high-strength steel sheet has a predetermined component composition, the balance being Fe and incidental impurities. The steel microstructure contains 20.0% or more and 60.0% or less ferrite in terms of area percentage, 40.0% or more and 80.0% or less of a hard phase composed of bainitic ferrite, tempered martensite, fresh martensite, and retained austenite in terms of total area percentage, 35.0% or more and 55.0% or less bainitic ferrite with respect to the entire hard phase in terms of area percentage, 20.0% or more and 40.0% or less tempered martensite with respect to the entire hard phase in terms of area percentage, 3.0% or more and 15.0% or less fresh martensite with respect to the entire hard phase in terms of area percentage, and 5.0% or more and 20.0% or less retained austenite with respect to the entire hard phase in terms of area percentage, in which the retained austenite has a C content of 0.6% or more by mass, and the ratio of the C content of the tempered martensite to the C content of the fresh martensite is 0.2 or more and less than 1.0.

6. 发明公开

EP3581670A1 HIGH-STRENGTH STEEL PLATE AND MANUFACTURING METHOD THEREFOR 有权
公开(公告)号：EP3581670A1
公开(公告)日：2019-12-18
申请号：EP18750760.3
申请日：2018-02-09
申请人： JFE Steel Corporation
发明人： MINAMI Hidekazu , SHIIMORI Fusae , KANEKO Shinjiro , KOBAYASHI Takashi , TANAKA Yuji
IPC分类号： C22C38/00 , C21D9/46 , C22C38/06 , C22C38/60 , C22C18/04
摘要： There are provided a high-strength steel sheet having a tensile strength of 1,180 MPa or more and a method for producing the high-strength steel sheet. The high-strength steel sheet has a predetermined component composition, the balance being Fe and incidental impurities, and a steel microstructure containing, by area, 75.0% or more tempered martensite, 1.0% or more and 20.0% or less fresh martensite, and 5.0% or more and 20.0% or less retained austenite, in which the hardness ratio of the fresh martensite to the tempered martensite is 1.5 or more and 3.0 or less, the ratio of the maximum KAM value in the tempered martensite in the vicinity of the heterophase interface between the tempered martensite and the fresh martensite to the average KAM value in the tempered martensite is 1.5 or more and 30.0 or less, and the average of ratios of grain sizes of prior austenite grains in the rolling direction to those in the thickness direction is 2.0 or less.

7. 发明公开

EP3971308A1 HIGH-STRENGTH MEMBER, METHOD FOR MANUFACTURING HIGH-STRENGTH MEMBER, AND METHOD FOR MANUFACTURING STEEL SHEET FOR HIGH-STRENGTH MEMBER 有权
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
申请人： JFE Steel Corporation
发明人： HIRASHIMA Takuya , KANEKO Shinjiro
IPC分类号： C21D9/00 , C21D9/46 , C22C38/00 , C22C38/06 , C22C38/60 , C21D1/30
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.

8. 发明公开

EP3845673A1 STEEL SHEET AND MANUFACTURING METHOD THEREFOR 审中-公开
公开(公告)号：EP3845673A1
公开(公告)日：2021-07-07
申请号：EP19873398.2
申请日：2019-10-16
申请人： JFE Steel Corporation
发明人： ONO Yoshihiko , TOBATA Junya , AKIMOTO Hiroyuki , MATSUI Yoichiro , KANEKO Shinjiro
IPC分类号： C21D9/46 , C22C38/00 , C22C38/06 , C22C38/60
摘要： A steel sheet and a method for producing the steel sheet are provided. The present invention provides a steel sheet with a specific composition, wherein a steel microstructure contains ferrite: 5% by area percentage or less, a microstructure composed of one or two or more of upper bainite, fresh martensite, tempered martensite, lower bainite, and retained γ: 95% to 100% by area percentage, and retained γ: 4% to 15% by volume percentage, retained γ UB with a grain width in the range of 0.25 to 0.60 µm, a grain length in the range of 1.0 to 15 µm, and an aspect ratio in the range of 3.1 to 25 has an area percentage S γUB in the range of 0.2% to 7.0%, retained γ LB with a grain width in the range of 0.08 to 0.24 µm, a grain length in the range of 0.6 to 15 µm, and an aspect ratio in the range of 4 to 40 has a distribution number N γLB in the range of 10 to 120 per 100 µm 2 , fresh martensite with an equivalent circular grain diameter in the range of 0.4 to 1.0 µm and an aspect ratio of 3 or less and/or retained γ grains with an equivalent circular grain diameter in the range of 0.4 to 1.0 µm and an aspect ratio of 3 or less have a total area percentage S γFine in the range of 0.4% to 5.0%, and fresh martensite with an equivalent circular grain diameter in the range of 1.2 to 20 µm and an aspect ratio of 3 or less and/or retained γ grains with an equivalent circular grain diameter in the range of 1.2 to 20 µm and an aspect ratio of 3 or less have a total area percentage S γBlock in the range of 4% or less (including 0%).

9. 发明授权

EP3508600B1 PRODUCTION METHOD OF HIGH-STRENGTH STEEL PLATE 有权
公开(公告)号：EP3508600B1
公开(公告)日：2020-06-24
申请号：EP17846478.0
申请日：2017-08-29
申请人： JFE Steel Corporation
发明人： MINAMI Hidekazu , KANEKO Shinjiro
IPC分类号： C22C38/00 , C21D9/46 , C22C38/04 , C22C38/60 , C21D8/02 , C21D1/18 , C21D1/20 , C21D1/25 , C22C38/02 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/34 , C22C38/38 , C23C2/06 , B32B15/01 , C21D6/00 , C23C2/00

10. 发明公开

EP3508601A1 HIGH-STRENGTH STEEL PLATE AND PRODUCTION METHOD THEREOF 有权
公开(公告)号：EP3508601A1
公开(公告)日：2019-07-10
申请号：EP17846479.8
申请日：2017-08-29
申请人： JFE Steel Corporation
发明人： MINAMI Hidekazu , KANEKO Shinjiro , SUGIHARA Reiko , TAHARA Kazunori , MORI Kazuma
IPC分类号： C22C38/00 , C21D9/46 , C22C38/04 , C22C38/60 , C21D8/02 , C21D1/18 , C21D1/20 , C21D1/25 , C22C38/02 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/34 , C22C38/38 , C23C2/06 , C23C2/00
CPC分类号： C22C38/60 , C21D1/185 , C21D1/20 , C21D1/25 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0273 , C21D9/46 , C21D2211/001 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C22C18/04 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/34 , C22C38/36 , C22C38/38 , C23C2/06 , C23C2/40
摘要： A high-strength steel sheet having a TS of 780 MPa or more, excellent stretch flangeability, and excellent in-plane anisotropy of TS is provided. A high-strength steel sheet comprises: a predetermined chemical composition; a steel microstructure including, in area fraction, ferrite: 20 % or more and 50 % or less, lower bainite: 5 % or more and 40 % or less, martensite: 1 % or more and 20 % or less, and tempered martensite: 20 % or less, and including, in volume fraction, retained austenite: 5 % or more, the retained austenite having an average grain size of 2 µm or less; and a texture having an inverse intensity ratio of γ-fiber to α-fiber of 3.0 or less.

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