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公开(公告)号：EP3992314A1
公开(公告)日：2022-05-04
申请号：EP20831485.6
申请日：2020-06-26
摘要： A steel sheet including a steel micro-structure containing, in volume fraction,
tempered martensite: 85% or more, retained austenite: 5% or more to less than 15%, and ferrite, pearlite, bainite, and as-quenched martensite being less than 10% in total, when contents of Mn and C in the retained austenite are denoted by Mn A and C A , and when contents of Mn and C in a matrix are denoted by Mn M and C M , respectively, following Formulas (1) to (3) are satisfied, and
the number of carbides having an equivalent circle radius of 0.1 µm or more is 100 or less in a region measuring 20000 µm 2 , and the steel sheet has a tensile strength of 1100 MPa or more. The steel sheet is excellent in crash resistance and formability. M n A / M n M ≥ 1.2 C A / C M ≤ 5.0 C A ≤ 1.0-
公开(公告)号：EP3922739A1
公开(公告)日：2021-12-15
申请号：EP20751943.0
申请日：2020-02-06
摘要： Provided are a hot dip galvanized steel sheet comprising a base steel sheet wherein the base steel sheet has a predetermined composition and contains ferrite: 0% to 50%, retained austenite: 0% to 30%, tempered martensite: 5% or more, fresh martensite: 0% to 10%, and pearlite and cementite in total: 0% to 5%, remaining structures consist of bainite, when defining a region having a hardness of 90% or less of the hardness at a position of 1/4 thickness to the base steel sheet side from an interface of the base steel sheet and a hot dip galvanized layer as a "soft layer", there is a soft layer having a thickness of 10 µm or more at the base steel sheet side from the interface, the soft layer contains tempered martensite, and an increase rate in a thickness direction of an area% of tempered martensite from the interface to the inside of the base steel sheet inside the soft layer is 5.0%/µm or less, and a method for producing the same.
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公开(公告)号：EP3778953A1
公开(公告)日：2021-02-17
申请号：EP18912425.8
申请日：2018-03-30
发明人： SANO, Kohichi , KAWATA, Hiroyuki , YAMAGUCHI, Yuji , UCHIDA, Satoshi , IMAI, Yoshinori , OKAMOTO, Riki
摘要： A steel sheet includes a hot-dip galvanized layer or a galvannealed layer on a surface of the steel sheet, the steel sheet including: in mass%, C: 0.06% or more and 0.22% or less; Si: 0.50% or more and 2.00% or less; Mn: 1.50% or more and 2.80% or less; Al: 0.02% or more and 1.00% or less; P: 0.001% or more and 0.100% or less; S: 0.0005% or more and 0.0100% or less; N: 0.0005% or more and 0.0100% or less; and a balance: Fe and impurities, wherein: a microstructure in a range of a 1/8 sheet thickness to a 3/8 sheet thickness centering on a 1/4 sheet thickness in a sheet thickness direction from the surface of the steel sheet includes, in area ratio, ferrite: 15% or more and 85% or less, retained austenite: less than 5%, martensite: 15% or more and 75% or less, perlite: 5% or less, and a balance (including 0%): bainite; the number of ferrite agglomerates each having a thickness in the sheet thickness direction of 20 µ m or less is 50% or more of the total number of ferrite agglomerates; a decarburized layer having a thickness of 10 µ m or more and 150 µ m or less is formed in a surface layer part of the steel sheet; and a grain size of ferrite in the decarburized layer is 30 µ m or less, and a percentage of martensite grains each having an aspect ratio of 5 or more among martensite grains is 50 % or less.
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公开(公告)号：EP2530179A1
公开(公告)日：2012-12-05
申请号：EP11737032.0
申请日：2011-01-26
发明人： SANO, Kohichi , WAKABAYASHI, Chisato , KAWATA, Hiroyuki , OKAMOTO, Riki , YOSHINAGA, Naoki , KAWASAKI, Kaoru , SUGIURA, Natsuko , FUJITA, Nobuhiro
CPC分类号： C22C38/02 , C21D8/0436 , C21D8/0473 , C21D9/48 , C21D2211/001 , C21D2211/002 , C21D2211/008 , C22C38/04 , C22C38/06 , C23C2/04 , C23C2/26 , C23C2/28
摘要： A high-strength cold-rolled steel sheet includes, by mass%, C: 0.10% to 0.40%, Mn: 0.5% to 4.0%, Si: 0.005% to 2.5%, Al: 0.005% to 2.5%, Cr: 0% to 1.0%, and a balance of iron and inevitable impurities, in which an amount of P is limited to 0.05% or less, an amount of S is limited to 0.02% or less, an amount ofN is limited to 0.006% or less, the microstructure includes 2% to 30% of retained austenite by area percentage, martensite is limited to 20% or less by area percentage in the microstructure, an average particle size of cementite is 0.01 µm to 1 µm, and 30% to 100% of the cementite has an aspect ratio of 1 to 3.
摘要翻译： 高强度冷轧钢板以质量％计含有C：0.10〜0.40％，Mn：0.5〜4.0％，Si：0.005〜2.5％，Al：0.005〜2.5％，Cr：0 ％以上且1.0％以下，余量为铁和不可避免的杂质，将P量限制在0.05％以下，S量限制在0.02％以下，N量限制在0.006％以下 微观组织以面积率计含有2％〜30％的残留奥氏体，组织中的马氏体的面积率为20％以下，渗碳体的平均粒径为0.01μm〜1μm，以及30％〜100％ 的渗碳体具有1至3的纵横比。
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公开(公告)号：EP3950975A1
公开(公告)日：2022-02-09
申请号：EP20785386.2
申请日：2020-03-12
摘要： Provided are: a steel sheet having a high strength and excellent hydrogen embrittlement resistance; and a method of producing the same. The steel sheet has prescribed chemical composition and structure, in which a standard deviation σ of Mn concentration satisfies σ ≥ 0.15 Mn ave (wherein, Mn ave represents an average Mn concentration) and a region with a Mn concentration of higher than (Mn ave + 1.3σ) has a circle-equivalent diameter of less than 10.0 µm. The method of producing the steel sheet includes: the hot rolling step that includes finish rolling a slab having a prescribed chemical composition under prescribed conditions; the step of coiling the thus obtained hot-rolled steel sheet at a coiling temperature of 450 to 700°C; and the step of cold rolling the hot-rolled steel sheet and subsequently annealing this steel sheet at 800 to 900°C.
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公开(公告)号：EP3922745A1
公开(公告)日：2021-12-15
申请号：EP20752477.8
申请日：2020-02-06
摘要： Provided are a hot dip galvanized steel sheet comprising a base steel sheet and a hot dip galvanized layer on at least one surface of the base metal steel sheet, wherein the base steel sheet has a predetermined chemical composition, and contains, by volume fraction, ferrite: 0% to 50%, retained austenite: 0% to 30%, tempered martensite: 5% or more, fresh martensite: 0% to 10%, and pearlite and cementite in total: 0% to 5%, when there are remaining structures, the remaining structures consist of bainite, a concentration of B atoms at prior austenite grain boundaries is 2.0 atm% or more, and an average effective crystal grain size is 7.0 µm or less, and a method for producing the same.
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公开(公告)号：EP3922740A1
公开(公告)日：2021-12-15
申请号：EP20752571.8
申请日：2020-02-06
摘要： Provided are a hot dip galvanized steel sheet comprising a base steel sheet wherein the base steel sheet has a predetermined chemical composition, and contains ferrite: 50% or less, retained austenite: 30% or less, tempered martensite: 5% or more, fresh martensite: 10% or less, and pearlite and cementite in total: 5% or less, remaining structures consist of bainite, and a number ratio of tempered martensite with a Mn concentration profile satisfying [Mn] b /[Mn] a >1.2 and [Mn] a /[Mn] a is the average Mn concentration in the tempered martensite, and [Mn] b is the Mn concentration at the interfaces of different phases of the tempered martensite and ferrite phase and bainite phase) is 0.2 or more with respect to the total number of tempered martensite, and a method for producing the same.
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公开(公告)号：EP2738283B1
公开(公告)日：2020-06-24
申请号：EP12820655.4
申请日：2012-07-27
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公开(公告)号：EP2474381B8
公开(公告)日：2019-07-24
申请号：EP10812061.9
申请日：2010-08-30
发明人： OIKAWA, Hatsuhiko , HAMATANI, Hideki , AZUMA, Masafumi , SUZUKI, Noriyuki , WATANABE, Fuminori , MARUYAMA, Naoki , KAWATA, Hiroyuki
IPC分类号： B23K11/11 , B23K11/16 , B23K11/24 , B23K11/36 , B23K31/00 , B23K103/04 , B32B15/01 , C22C38/00 , C22C38/04 , C22C38/06 , B23K101/18 , B23K101/34 , C22C38/02
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公开(公告)号：EP4394071A1
公开(公告)日：2024-07-03
申请号：EP21955078.7
申请日：2021-08-27
摘要： Adopted are a steel sheet contains, as a chemical composition, by mass%, C: 0.040% to 0.105%, Mn: 1.00% to 2.30%, Si: 0.005% to 1.500%, Al: 0.005% to 0.700%, P: 0.100% or less, S: 0.0200% or less, N: 0.0150% or less, O: 0.0100% or less, and a remainder: Fe and impurities, in which ΔC that is calculated from C20, which is a C content at a 20 µm depth position from a surface, C60, which is a C content at a 60 µm depth position from the surface, and the following expression (1) is in a range of 0.20 to 0.90 mass%/mm, and a press-formed article that is obtained by press-forming the steel sheet. ΔC=C60−C20/0.04
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