公开(公告)号：US20200299797A1

公开(公告)日：2020-09-24

申请号：US16089138

申请日：2017-03-17

Applicant: JFE Steel Corporation

Inventor： Noriaki Kohsaka ,  Yoshimasa Funakawa

IPC: C21D9/46 ,  B32B15/01 ,  C21D8/02 ,  C21D6/00 ,  C22C38/60 ,  C22C38/50 ,  C22C38/48 ,  C22C38/42 ,  C22C38/14 ,  C22C38/12 ,  C22C38/10 ,  C22C38/04 ,  C22C38/58 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C23C2/02 ,  C23C2/06 ,  C22C18/00 ,  C23C2/40

Abstract: Provided are a coated steel sheet and so forth, the coated steel sheet having a tensile strength of 590 MPa or more and good stretch-flangeability. The coated steel sheet includes a specific component composition, in which the area fraction of a ferrite phase is 80% or more and 98% or less, the area fraction of a martensite phase of 2% or more and 15% or less, ferrite grains have an average thickness of 3.0 μm or less in the sheet-thickness direction, the martensite phase has an average grain size of 2.0 μm or less, and a Nb-containing carbide precipitated in the ferrite grains has an average grain size of 8 nm or less, and in which the steel sheet has a tensile strength of 590 MPa or more.

公开(公告)号：US20200299795A1

公开(公告)日：2020-09-24

申请号：US16895061

申请日：2020-06-08

Applicant: GREER STEEL COMPANY

Inventor： DOUGLAS B. CAMPBELL ,  TODD DAENZER

IPC: C21D9/16 ,  C22C38/58 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C23C2/26 ,  C23C2/06 ,  C23C2/02 ,  F42B5/32 ,  F42B33/00

Abstract: The present invention relates generally to steel compositions, methods of manufacturing the compositions and using the compositions to produce rimfire ammunition cartridges. The steel compositions for use in the rimfire cartridges are processed through cold-rolling and annealing steps to create suitable physical properties.

公开(公告)号：US20200255916A1

公开(公告)日：2020-08-13

申请号：US16859729

申请日：2020-04-27

Applicant: ThyssenKrupp Steel Europe AG ,  ThyssenKrupp AG

Inventor： Janko Banik ,  Ulrich Etzold ,  Norbert Rössler ,  Manuela Ruthenberg ,  Thiemo Wuttke

IPC: C21D9/00 ,  C23C2/40 ,  C22C38/32 ,  C22C38/28 ,  C22C38/22 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C21/02 ,  C21D8/00 ,  C23C2/12 ,  B32B15/01 ,  B32B15/04 ,  B32B15/18 ,  C21D8/02 ,  C22C21/06 ,  C22C21/16 ,  C22C21/12 ,  C22C21/08 ,  C23C28/00 ,  C23C2/06 ,  C23C30/00 ,  C23C2/02 ,  C23C2/26 ,  C21D1/673

Abstract: A flat steel product for hot forming may be produced from a steel substrate that includes a steel comprising 0.1-3% by weight Mn and up to 0.01% by weight B, along with a protective coating that is applied to the steel substrate. The protective coating may be based on Al and may contain up to 20% by weight of other alloy elements. Also disclosed are methods for producing such flat steel products, steel components, and methods for producing steel components. Absorption of hydrogen is minimized during heating necessary for hot forming. This is achieved at least in part through an alloy constituent of 0.1-0.5% by weight of at least one alkaline earth or transition metal in the protective coating, wherein an oxide of the alkaline earth or transition metal is formed on an outer surface of the protective coating during hot forming of the flat steel product.

公开(公告)号：US20200248294A1

公开(公告)日：2020-08-06

申请号：US16652196

申请日：2018-09-13

Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)

Inventor： Kazuya KIMIJIMA ,  Seiji MORISHIGE ,  Shinobu NAKAYAMA ,  Ryo SASAKI ,  Mikato TAKEDA

IPC: C23C2/02 ,  C21D9/46 ,  C22C38/02 ,  C23C2/06 ,  C23C2/40

Abstract: The present invention is a production method of a hot-dip galvanized steel sheet including annealing a belt-shaped steel sheet having a Si content of greater than or equal to 0.2% by mass, wherein the annealing is continuously carried out using an annealing furnace having an oxidation heating zone and a reduction heating zone in this order, while the steel sheet is fed using rollers. The annealing includes oxidizing a surface of the steel sheet in the oxidation heating zone at a temperature at which roll pickup does not occur and reducing an iron oxide layer, formed by the oxidizing, in the reduction heating zone before the iron oxide layer reaches an initial roller in the reduction heating zone.

公开(公告)号：US20200232083A1

公开(公告)日：2020-07-23

申请号：US16633529

申请日：2017-07-31

Applicant: NIPPON STEEL CORPORATION

Inventor： Atsushi MORISHITA ,  Taihei KANETO ,  Satoshi UCHIDA ,  Tatsuya NAKADA ,  Yuji YAMAGUCHI

IPC: C23C2/06 ,  B32B15/01 ,  C21D9/48 ,  C21D8/04 ,  C21D6/00 ,  C23C2/40 ,  C23C2/02 ,  C22C38/06 ,  C22C38/04 ,  C22C38/00 ,  C22C38/02

Abstract: A hot-dip galvanized steel sheet including: a hot-dip galvanizing layer on at least one side of a base steel sheet, wherein the hot-dip galvanizing layer has a Fe content of more than 0% and 3.0% or less and an Al content of more than 0% and 1.0% or less, the hot-dip galvanized steel sheet including: a Fe—Al alloy layer provided on an interface between the hot-dip galvanizing layer and the base steel sheet, the Fe—Al alloy layer having a thickness of 0.1 μm to 2.0 μm, and a difference between a maximum value and a minimum value of the thickness of the Fe—Al alloy layer in a width direction of the base steel sheet being within 0.5 μm; and a fine-grain layer provided in the base steel sheet and directly in contact with the Fe—Al alloy layer, the fine-grain layer having an average thickness of 0.1 μm to 5.0 μm, the fine-grain layer including a ferrite phase with an average grain diameter of 0.1 μm to 3.0 μm, the fine-grain layer containing oxides of one or more out of Si and Mn, a maximum diameter of the oxides being 0.01 μm to 0.4 μm, and a difference between a maximum value and a minimum value of the thickness of the fine-grain layer in the width direction of the base steel sheet being within 2.0 μm.

公开(公告)号：US10669603B2

公开(公告)日：2020-06-02

申请号：US15509167

申请日：2015-08-26

Applicant: ThyssenKrupp Steel Europe AG ,  ThyssenKrupp AG

Inventor： Janko Banik ,  Ulrich Etzold ,  Norbert Rössler ,  Manuela Ruthenberg ,  Thiemo Wuttke

IPC: C21D8/00 ,  C21D9/00 ,  C23C2/40 ,  C23C2/12 ,  C22C38/32 ,  C22C38/22 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/28 ,  C22C21/02 ,  C21D1/673 ,  C23C2/26 ,  C23C30/00 ,  C23C28/00 ,  C23C2/02 ,  C23C2/06 ,  C22C21/08 ,  C22C21/12 ,  C22C21/16 ,  C22C21/06 ,  C21D8/02 ,  B32B15/04 ,  B32B15/18 ,  B32B15/01

Abstract: A flat steel product for hot forming may be produced from a steel substrate that includes a steel comprising 0.1-3% by weight Mn and up to 0.01% by weight B, along with a protective coating that is applied to the steel substrate. The protective coating may be based on Al and may contain up to 20% by weight of other alloy elements. Also disclosed are methods for producing such flat steel products, steel components, and methods for producing steel components. Absorption of hydrogen is minimized during heating necessary for hot forming. This is achieved at least in part through an alloy constituent of 0.1-0.5% by weight of at least one alkaline earth or transition metal in the protective coating, wherein an oxide of the alkaline earth or transition metal is formed on an outer surface of the protective coating during hot forming of the flat steel product.

公开(公告)号：US20200157670A1

公开(公告)日：2020-05-21

申请号：US16191710

申请日：2018-11-15

Applicant: PSITEC OY

Inventor： Pertti SIPPOLA

IPC: C23C2/06 ,  C23C2/00 ,  C23C2/02

Abstract: A method and arrangement for manufacturing hot dip galvanized rolled high strength steel product is presented. The method comprises providing a rolled steel product, heating and annealing the rolled steel product for creating a layer of iron oxide on the surface of the rolled steel product, cooling the rolled steel product, having the iron oxide layer, in a first cooling step to a temperature in a temperature range of 560-600° C. and holding for 3-10 seconds, quenching said rolled steel product, covered with the layer of iron oxide, in a second cooling step by immersing it into a zinc bath comprising aluminium and having a temperature between 440-450° C. for 1-5 seconds and cooling the rolled steel product in a third cooling step to room temperature. An arrangement for implementing the method is also presented.

公开(公告)号：US10655194B2

公开(公告)日：2020-05-19

申请号：US15561365

申请日：2016-03-18

Applicant: JFE STEEL CORPORATION

Inventor： Yuma Honda ,  Yoshimasa Funakawa ,  Kozo Harada

IPC: C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C22C38/54 ,  C22C38/48 ,  C22C38/16 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C23C2/28 ,  B32B15/01 ,  C22C38/12 ,  C23C2/06 ,  C23C2/40 ,  C23C2/02 ,  C23C30/00 ,  C22C38/20 ,  C23C2/26 ,  C23C28/00 ,  C22C38/18 ,  C22C38/26 ,  C23C2/04 ,  C22C38/08 ,  B32B15/04 ,  B32B15/18 ,  B32B15/00

Abstract: A high-strength steel sheet having a high yield ratio and excellent stretch flangeability, and a method for producing the high-strength steel sheet. The high-strength steel sheet has a composition containing, by mass: C: 0.02% or more and less than 0.10%, Si: less than 0.10%, Mn: less than 1.0%, P: 0.10% or less, S: 0.020% or less, Al: 0.01% or more and 0.10% or less, N: 0.010% or less, Nb: 0.005% or more and less than 0.070%, and the balance being Fe and inevitable impurities; and a microstructure including, by area: ferrite: 85% or more, pearlite: 0% to 15%, and a total of martensite, retained austenite and cementite: 0% to 3%. The average crystal grain diameter of the ferrite is 15.0 μm or less. The grain diameter of a Nb carbide is 5 to 50 nm. The amount of Nb carbide precipitate is 0.005% to 0.050% in terms of volume fraction.

公开(公告)号：US20200095652A1

公开(公告)日：2020-03-26

申请号：US16496115

申请日：2018-03-22

Applicant: FIVES STEIN

Inventor： Michel CLIN ,  Florent CODE ,  Loïc PHILIPPE ,  Eric MAGADOUX

IPC: C21D9/573 ,  C21D1/60 ,  C21D11/00 ,  C23C2/02 ,  C21D1/613

Abstract: Cooling section for a steel strip continuous annealing or galvanizing line arranged to handle a metal strip (1), said section comprising at least one area (2) for dry cooling set up to project gas on said steel strip and at least one wet cooling area (5) set up to project a liquid or a mixture of gas and liquid on said steel strip.

公开(公告)号：US10597764B2

公开(公告)日：2020-03-24

申请号：US15323165

申请日：2015-08-11

Applicant: Kobe Steel, Ltd.

Inventor： Minoru Chida ,  Hiroshi Irie

IPC: C23C2/06 ,  C23C2/40 ,  C23C2/02 ,  C21D9/46 ,  C21D6/00 ,  C21D1/26 ,  C22C38/38 ,  C22C38/32 ,  C22C38/22 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B32B15/01 ,  C22C38/34 ,  C22C38/26 ,  C22C38/28 ,  C21D1/76 ,  C23C2/26 ,  C23C30/00 ,  C23C2/04 ,  B32B15/04 ,  C23C2/12 ,  C23C2/28 ,  B32B15/18 ,  C21D1/74

Abstract: Provided is a technique in which a reduction annealing method is used to efficiently produce a high-strength hot-dip galvanizing substrate or high-strength hot-dip galvannealing substrate, which is useful as a raw material for producing a high-strength plated steel sheet suppressed in the occurrence of bare spot. The substrate for hot-dip galvanizing or hot-dip galvannealing of the present invention satisfies the following condition: when the mapping intensity of Fe, which is obtained by using an electron probe microanalyser in a measurement field of view of 33.6 μm×41.4 μm on the surface after reduction annealing, of 0 to 240 is divided into 16 parts at an interval of 15, the area occupied by a mapping intensity of 195 or more has 70% or more.