公开(公告)号：EP3348665A4

公开(公告)日：2018-07-25

申请号：EP16843920

申请日：2016-09-01

申请人： JFE STEEL CORP

发明人： KASAI SHOJI ,  DOI TAKASHI ,  NISHIDE MASATOSHI

IPC分类号： C23C10/08 ,  C21D9/46 ,  C21D9/56 ,  C23C10/44 ,  C23C10/46

CPC分类号： C21D9/46 ,  C21D9/56 ,  C23C10/08 ,  C23C10/44 ,  C23C10/46

摘要： A high-silicon steel strip having an excellent surface quality is manufactured with high reaction efficiency. A basic configuration includes partition plates 2 arranged in the longitudinal direction of a furnace to extend from a position in the vicinity of respective gas nozzles 1 to be in parallel to the pass line of the steel strip, and obstacles 3 arranged to face partition-plate rear edges 20 in the longitudinal direction of the furnace to obstruct the flow of the gas along the steel strip so that siliconizing spaces s surrounded by the steel strip, the partition plates 2, and the obstacles 3 are formed; and gaps e a between the partition-plate rear edges 20 and the obstacles 3 and so forth which form exhaust passages e through which gas is discharged from the siliconizing spaces s to other spaces inside the furnace so that treatment gas which has been sprayed from the gas nozzles 1 onto a surface of the steel strip to flow through the siliconizing spaces s is discharged through the exhaust passages e. The relationship between the volume of the siliconizing spaces s and the area of the exhaust passages e is optimized in the basic configuration under a certain condition in accordance with the amount of the steel strip in the siliconizing spaces s.

公开(公告)号：EP3266533A4

公开(公告)日：2018-07-25

申请号：EP16758649

申请日：2016-03-03

申请人： JFE STEEL CORP

发明人： OKITA YASUAKI ,  IKEDA RINSEI ,  NAKAJIMA SEIJI ,  NAKAGAWA KOICHI

IPC分类号： B21D22/20 ,  B23K9/16 ,  B23K9/167 ,  B23K9/23 ,  B23K10/02 ,  B23K26/21 ,  B23K26/322 ,  B23K26/348 ,  B23K31/00 ,  C21D1/18 ,  C21D9/00 ,  C22C18/00 ,  C22C18/04 ,  C22C38/00 ,  C22C38/60 ,  C23C2/06 ,  C23C2/40

CPC分类号： C21D9/50 ,  B21D22/20 ,  B21D22/208 ,  B21D53/88 ,  B23K9/16 ,  B23K9/167 ,  B23K9/23 ,  B23K10/02 ,  B23K26/21 ,  B23K26/348 ,  B23K31/00 ,  B23K2203/08 ,  C21D1/18 ,  C21D9/00 ,  C22C18/00 ,  C22C18/04 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  C22C38/60 ,  C23C2/06 ,  C23C2/40

摘要： A hot-pressed member is formed using a tailored blank material obtained by butt joining respective ends of two or more coated steel sheets. The hot-pressed member has two or more sites formed by the respective coated steel sheets and at least one joining portion between the sites. Depending on a type of a coated layer of each of the coated steel sheets, t w /t 0 is appropriately controlled where t w is a thickness of a thinnest portion in the joining portion and t 0 is a thickness of a thinnest site of the sites. A tensile strength of each of the sites is 1180 MPa or more.

公开(公告)号：EP3336212A4

公开(公告)日：2018-07-04

申请号：EP16834824

申请日：2016-08-10

申请人： JFE STEEL CORP

发明人： TSUZUMI KENJI ,  KAWASAKI YOSHIYASU ,  MIKI YUJI

IPC分类号： C22C38/00 ,  B22D11/00 ,  B22D11/124 ,  C21D6/00 ,  C21D8/02 ,  C21D8/04 ,  C21D9/46 ,  C22C38/14 ,  C22C38/60 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40 ,  C23C28/02

CPC分类号： B22D11/124 ,  B22D11/00 ,  B22D11/001 ,  B22D11/22 ,  C21D6/005 ,  C21D8/021 ,  C21D8/0226 ,  C21D8/041 ,  C21D8/0426 ,  C21D8/0436 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/14 ,  C22C38/60 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40 ,  C23C28/02

摘要： A high strength steel sheet having excellent surface quality and formability with a tensile strength of 980 MPa or more and a TS-El balance of 30000 MPa% or more is provided. A high strength steel sheet comprises: a chemical composition containing C: 0.08 % to 0.30 %, Si: 2.0 % or less, Mn: more than 3.0 % and 10.0 % or less, P: 0.05 % or less, S: 0.01 % or less, Al: 1.5 % or less, Ti: 0.010 % to 0.300 %, and N: 0.0020 % to 0.0100 % in a range satisfying 1.1 ‰¤ (Ti + Mn 1/2 /400)/(0.01 + 5N) ‰¤ 6.0; and a microstructure including a retained austenite phase and a ferrite phase, wherein a ratio ³Mn/±Mn of an average Mn concentration (³Mn) of the retained austenite phase to an average Mn concentration (±Mn) of the ferrite phase is 1.5 or more.

公开(公告)号：EP3330016A4

公开(公告)日：2018-06-27

申请号：EP16830013

申请日：2016-07-05

申请人： JFE STEEL CORP

发明人： NAKAJIMA SEIJI ,  ANDO SATORU

IPC分类号： B21D22/20 ,  B21D22/26 ,  C21D8/02 ,  C21D9/46 ,  C23C2/06 ,  C23C2/26 ,  C23C2/40 ,  C25D5/26 ,  C25D5/48

CPC分类号： B21D22/20 ,  B21D22/26 ,  C21D8/0278 ,  C21D9/46 ,  C23C2/06 ,  C23C2/26 ,  C23C2/40 ,  C25D5/48

摘要： Provided is a method for manufacturing a hot-pressed member excellent in terms of surface appearance with which it is possible to stably manufacture a hot-pressed member having a homogeneous and good surface appearance without causing a significant increase in cost. A method for manufacturing a hot-pressed member includes heating a zinc-based coated steel sheet to a temperature range from the Ac3 transformation temperature to 1000°C, performing hot pressing work, and performing cooling, in which a surface-cleaning treatment is performed on the zinc-based coated steel sheet before the heating is performed. A method for manufacturing a hot-pressed member includes performing cold pressing work on a zinc-based coated steel sheet, heating the zinc-based coated steel sheet to a temperature range from the Ac3 transformation temperature to 1000°C, and cooling the heated steel sheet, in which a surface-cleaning treatment is performed on the zinc-based coated steel sheet before the heating is performed. It is preferable that the zinc-based coated steel sheet be a Zn-Ni-alloy-coated steel sheet having a coating layer on one or both sides of the Zn-Ni-alloy-coated steel sheet, and the coating layer have a chemical composition containing 10 mass% to 25 mass% of Ni and the balance being Zn and inevitable impurities and a coating weight per side of 10 g/m 2 to 90 g/m 2 .

公开(公告)号：EP3332888A4

公开(公告)日：2018-06-13

申请号：EP16832759

申请日：2016-07-20

申请人： JFE STEEL CORP

发明人： OKABE SEIJI ,  IMAMURA TAKESHI ,  TAKAJO SHIGEHIRO

IPC分类号： B22D11/06

CPC分类号： B22D11/0611 ,  B22D11/0665 ,  B22D11/0697

摘要： A single roll type apparatus for manufacturing a metal thin strip by injecting a molten metal onto an outer peripheral face of a cooling roll rotating at a high speed and rapidly solidifying it to manufacture a metal thin strip, wherein an airflow blocking device for blocking the airflow along the surface of the cooling roll is provided at an upstream side of a molten metal injection nozzle for injecting the molten metal in a rotation direction of the cooling roll, and a carbon dioxide gas injection nozzle for forming a flow of carbon dioxide gas on an outer peripheral surface of the cooling roll between the airflow blocking device and the molten metal injection nozzle or forming a carbon dioxide atmosphere on the surface of the cooling roll between the airflow blocking device and the molten metal injection nozzle is disposed, and a foreign material removal device for removing foreign material attached to the surface of the cooling roll is disposed at an upstream side of the airflow blocking device in the rotation direction of the cooling roll, whereby a metal thin strip having a good surface quality can be manufactured stably even in the continuous operation for a long time.

公开(公告)号：EP3315584A4

公开(公告)日：2018-05-30

申请号：EP16814205

申请日：2016-06-13

申请人： JFE STEEL CORP

发明人： FUJIMOTO HIDEKAZU ,  ANYASHIKI TAKASHI ,  SHIOZAWA TORU

IPC分类号： C10B53/08 ,  C10B57/06

CPC分类号： C10B53/08 ,  C10B57/06

摘要： [Task] It is to propose a method for producing a molded product for ferrocoke, wherein a high-strength molded product for ferrocoke can be produced advantageously without making particular investment in facilities and inviting the operating troubles. [Solution] In a method for producing a molded product for ferrocoke by molding a mixed starting material of coal, an iron-source material, a high-softening point binder having a softening point of not lower than 150°C, and a low-softening point binder having a softening point of lower than 150°C, at least one of the iron-source material and the high-softening point binder is previously heated to not less than a temperature lower by 20°C than a softening point of the high-softening point binder to perform molding of the mixture.

公开(公告)号：EP3290146A4

公开(公告)日：2018-05-16

申请号：EP16786122

申请日：2016-04-15

申请人： JFE STEEL CORP

发明人： SAWANISHI CHIKAUMI ,  MATSUDA HIROSHI ,  IKEDA RINSEI

IPC分类号： B23K11/24 ,  B23K11/11 ,  B23K11/25 ,  B23K101/18 ,  B23K103/04

CPC分类号： B23K11/11 ,  B23K11/115 ,  B23K11/25 ,  B23K11/257 ,  B23K11/258 ,  B23K2201/18 ,  B23K2203/04

摘要： A stored time variation curve and cumulative amount of heat generated of each step are each used as a target. In the case where a time variation of an instantaneous amount of heat generated per unit volume differs from the time variation curve in any of the steps, a current passage amount is controlled in order to compensate for the difference within a remaining welding time in the step so that a cumulative amount of heat generated per unit volume in actual welding matches the stored cumulative amount of heat generated in the test welding. Further, in the case where expulsion is detected in any of the steps, then in subsequent welding, the cumulative amount of heat generated per unit volume used as the target is reduced, and the current passage amount is adjusted in accordance with the reduced cumulative amount of heat generated per unit volume.

公开(公告)号：EP3266897A4

公开(公告)日：2018-03-28

申请号：EP16761275

申请日：2016-03-01

申请人： JFE STEEL CORP

发明人： KIZU TARO ,  TOYODA SHUNSUKE ,  KIDO AKIMASA ,  TADANI TETSUSHI

IPC分类号： C22C38/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58 ,  C22C38/60

CPC分类号： C21D9/46 ,  C21D8/0205 ,  C21D8/0226 ,  C21D2211/005 ,  C22C38/00 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58 ,  C22C38/60 ,  Y02P10/212

摘要： A high strength steel sheet having high strength such as a tensile strength of 780 MPa or more and having excellent blanking workability and stretch flangeability and a manufacturing method therefor are provided. A high strength steel sheet comprises: a chemical composition containing, in mass%, C: 0.05% to 0.30%, Si: 0.6% to 2.0%, Mn: 1.3% to 3.0%, P: 0.10% or less, S: 0.030% or less, Al: 2.0% or less, N: 0.010% or less, and one or more of Ti, Nb, and V: 0.01% to 1.0% each, with a balance being Fe and incidental impurities; a ferrite microstructure of 50% or more in area ratio; an amount of precipitated Fe of 0.04 mass% or more; and a precipitate with a particle size of less than 20 nm, wherein C* defined by the following Expression (1) and C* p defined by the following Expression (2) meet conditions of the following Expressions (3) to (5): C * = Ti / 48 + Nb / 93 + V / 51 + Mo / 96 + Ta / 181 + W / 184 × 12 C * p = Ti p / 48 + Nb p / 93 + V p / 51 + Mo p / 96 + Ta p / 181 + W p / 184 × 12 C * ‰¥ 0.035 ˆ’ 0.015 ‰¤ C ˆ’ C * ‰¤ 0.03 C * p / C * ‰¥ 0.3

公开(公告)号：EP3276020A4

公开(公告)日：2018-03-21

申请号：EP15887393

申请日：2015-03-27

申请人： JFE STEEL CORP

发明人： OTA SHUSAKU ,  SHIMAMURA JUNJI ,  ISHIKAWA NOBUYUKI ,  ENDO SHIGERU

IPC分类号： C22C38/00 ,  C21D8/02 ,  C21D8/10 ,  C21D9/46 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/28 ,  C22C38/44 ,  C22C38/50 ,  C22C38/58

CPC分类号： C21D9/08 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/02 ,  C21D8/10 ,  C21D8/105 ,  C21D9/46 ,  C21D2211/002 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58

摘要： Provided is a technique with which it is possible to achieve a tensile strength of 620 MPa or more (API grade X80 or higher) which is required for a steel pipe of API grade X80 or higher even after long-term aging in a mid-temperature range. The high-strength steel has a specified chemical composition, in which parameter P eff is 0.050% or more, satisfies the relationship (TS 0 - TS)/TS 0 ‰¤ 0.050, where TS is defined as tensile strength determined at a temperature of 350°C after aging has been performed under the condition of a Larson-Miller Parameter (LMP) of 15700, and where TS 0 is defined as tensile strength determined at a temperature of 350°C before the aging is performed, and has toughness represented by a vE -20 of 100 J or more in a weld heat-affected zone, which is formed when welding is performed.

公开(公告)号：EP3257973A4

公开(公告)日：2018-03-21

申请号：EP16748883

申请日：2016-02-01

申请人： JFE STEEL CORP

发明人： SUEHIRO RYUICHI ,  TERASHIMA TAKASHI

IPC分类号： C25F3/06 ,  C21D8/12 ,  C22C38/00 ,  C22C38/06 ,  G03F7/023 ,  G03F7/027 ,  G03F7/031 ,  G03F7/033 ,  G03F7/038 ,  G03F7/039 ,  G03F7/40 ,  H01F1/16

CPC分类号： G03F7/039 ,  C21D6/005 ,  C21D6/008 ,  C21D8/005 ,  C21D8/12 ,  C21D8/1266 ,  C21D8/1272 ,  C21D8/1277 ,  C21D8/1294 ,  C21D9/46 ,  C21D2201/05 ,  C22C38/00 ,  C22C38/001 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C25F3/06 ,  G03F7/022 ,  G03F7/023 ,  G03F7/027 ,  G03F7/031 ,  G03F7/033 ,  G03F7/038 ,  G03F7/20 ,  G03F7/325 ,  G03F7/40 ,  H01F1/16

摘要： Provided is a manufacturing method for a grain-oriented electrical steel sheet with which it is possible to achieve both good iron loss and high productivity. In groove formation for magnetic domain refinement, a resist containing a photosensitive resin is applied, photoexposed, and developed to form an exposed steel substrate portion having a linear shape. Subsequently, electrolytic etching is performed at current density Á = I / S of 7.5 A/cm 2 or more with respect to the exposed steel substrate portion, where I represents current supplied to an electrode and S represents surface area of the exposed steel substrate portion in a steel sheet surface of equal surface area to the electrode.