公开(公告)号：US20200277693A1

公开(公告)日：2020-09-03

申请号：US16753739

申请日：2018-10-19

申请人： ArcelorMittal

发明人： Anirban CHAKRABORTY ,  Hassan GHASSEMI-ARMAKI

IPC分类号： C23C2/02 ,  C23C2/06 ,  C23C2/40 ,  C23C28/02 ,  C21D9/46 ,  C21D6/00 ,  B32B15/01 ,  C22C19/03 ,  C22C38/38 ,  C22C38/34 ,  C22C38/22 ,  C22C38/06

摘要： Method for the manufacture of a coated steel sheet including the following step of A) the provision of a pre-coated steel sheet coating with a first coating including iron and nickel, B) the thermal treatment of such pre-coated steel sheet at a temperature between 600 and 1000° C., and C) the coating of the steel sheet obtained in step B) with a second coating based on zinc.

公开(公告)号：US20200270717A1

公开(公告)日：2020-08-27

申请号：US16089846

申请日：2017-01-16

申请人： JFE STEEL CORPORATION

发明人： Tatsuya NAKAGAITO ,  Yoshimasa FUNAKAWA ,  Yoshihiko ONO ,  Hiroshi HASEGAWA

IPC分类号： C21D9/46 ,  B32B15/01 ,  C22C38/38 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

摘要： A steel sheet having excellent fatigue resistance as a material for automobile parts and a TS of 590 MPa or more, and a method for producing the same. The steel sheet having a specified chemical composition and a microstructure of 50% or more and 90% or less of martensite, 10% to 50% of ferrite and bainite in total, in terms of an area ratio, and an average concentration of solute Mn in ferrite in a region from a surface of a base steel to a depth of 0.5 μm is 60% or more relative to an average concentration of solute Mn in ferrite at a location of ¼ in the thickness of the steel sheet.

公开(公告)号：US20200263283A1

公开(公告)日：2020-08-20

申请号：US16652933

申请日：2018-09-27

申请人： Salzgitter Flachstahl GmbH

发明人： Thomas Schulz

IPC分类号： C22C38/54 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C21D8/02 ,  C21D9/46 ,  C23C2/40 ,  C23C2/06

摘要： The invention relates to an ultrahigh strength multiphase steel having a minimum tensile strength of 980 MPa containing (in wt. %): C≥0.075 to ≤0.115; Si≥0.400 to ≤0.500; Mn≥1.900 to ≤2.350; Cr≥0.250 to ≤0.400; Al≥0.010 to ≤0.060; N≥0.0020 to ≤0.0120; P≤0.020; S≤0.0020; Ti≥0.005 to ≤0.060; Nb≥0.005 to ≤0.060; V≥0.005 to ≤0.020; B≥0.0005 to ≤0.0010; Mo≥0.200 to ≤0.300; Ca≥0.0010 to ≤0.0060; Cu≤0.050; Ni≤0.050; Sn≤0.040; H≤0.0010; and residual iron, including customary steel-accompanying smelting-related impurities, wherein the total content of Mn+Si+Cr is ≥1.750 to ≤2.250 wt. % with a view to a processing window which is as wide as possible during the annealing process, in particular during the continuous annealing process, of cold strips of said steel.

公开(公告)号：US10745775B2

公开(公告)日：2020-08-18

申请号：US15580002

申请日：2016-06-10

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Kohichi Sano ,  Jun Haga ,  Koutarou Hayashi ,  Hiroyuki Kawata ,  Riki Okamoto ,  Akihiro Uenishi

IPC分类号： C21D8/02 ,  C21D9/46 ,  C21D6/00 ,  C22C38/58 ,  C22C38/50 ,  C22C38/42 ,  C22C38/32 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C23C2/28 ,  C22C18/00 ,  C22C38/60 ,  C23C2/02 ,  C22C38/04 ,  C23C2/40 ,  C23C2/06 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/40 ,  C22C38/46 ,  C22C38/20 ,  C22C38/08 ,  C22C38/28 ,  C22C38/30 ,  C22C38/52 ,  C22C38/48 ,  C22C38/44 ,  C22C38/18 ,  C22C38/16 ,  C22C38/54 ,  B32B15/01 ,  B32B15/04 ,  B32B15/00 ,  B32B15/18 ,  C23C2/04 ,  C23C30/00 ,  C23C2/26

摘要： A steel sheet for galvannealed steel contains, by mass %, C: 0.25 to 0.70%, Si: 0.25 to 2.50%, Mn: 1.00 to 5.00%, Al: 0.005 to 3.50%, P: 0.15% or less, S: 0.03% or less, N £ 0.02%, O £ 0.01%, and optionally one or more selected from Ti, Nb, V, Cr, Mo, Cu, Ni, B, Ca, REM, Mg, W, Zr, Sb, Sn, As, Te, Y, Hf and Co, a balance being Fe and impurities. The microstructure consists of, by vol. %, retained g: 10.0 to 60.0%, high-temperature tempered martensite3 5.0%, low-temperature tempered martensite3 5.0%, fresh martensite £ 10.0%, a: 0 to 15.0%, P: 0 to 10.0%, a balance being bainite. Total volume ratio of tempered martensite and bainite is 30.0% or more, tensile strength is 1470 MPa or more, tensile strength×uniform elongation is 13000 MPa % or more, and tensile strength×local elongation is 5000 MPa % or more.

公开(公告)号：US20200232082A1

公开(公告)日：2020-07-23

申请号：US16486839

申请日：2018-02-09

申请人： JFE STEEL CORPORATION

发明人： Hirokazu KOBAYASHI

IPC分类号： C23C2/00 ,  C23C2/06 ,  C23C4/06 ,  C23C4/123

摘要： The disclosure provides a fully new method for hot-dip metal coating treatment, as a method for treating surfaces of a metal strip by hot-dip metal coating, by which inherent issues in conventional immersion coatings and spray coatings are avoided. In the disclosed method for hot-dip metal coating treatment, a surface of a metal strip is coated by discharging a droplet of a molten metal toward the surface of the metal strip, using a nozzle system configured to discharge the droplet of the molten metal from a nozzle due to an action of the Lorentz force generated on the molten metal by sending an electric current to the molten metal in a chamber, the chamber being applied with magnetic flux in a given direction, while the electric current sent in a direction perpendicular to the given direction.

公开(公告)号：US10718044B2

公开(公告)日：2020-07-21

申请号：US16092947

申请日：2016-07-15

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Takafumi Yokoyama ,  Kunio Hayashi ,  Masafumi Azuma ,  Eisaku Sakurada ,  Hiroyuki Kawata ,  Genki Abukawa

IPC分类号： C23C2/06 ,  C23C2/02 ,  C22C38/54 ,  C22C38/58 ,  C22C38/06 ,  C22C38/00 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C21D9/46 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/32 ,  C22C38/02 ,  C22C38/14 ,  C22C38/04 ,  C22C38/28 ,  C22C38/18 ,  C22C38/40 ,  C22C38/24 ,  C22C38/38 ,  C22C38/22 ,  C22C38/20 ,  C22C38/26 ,  C23C30/00 ,  C23C2/40 ,  C23C2/26 ,  C23C2/34 ,  B32B15/00 ,  B32B15/04 ,  B32B15/01 ,  B32B15/18

摘要： A hot-dip galvanized steel sheet includes: a predetermined chemical composition; and a steel structure represented by: in terms of area ratio, polygonal ferrite: 10% or less; upper bainite: 20% or less; retained austenite: 5% or less; and martensite: 70% or more, in which: martensite having Fe carbides at a number density of 1×106/mm2 or more is contained by 50% or more, in terms of area ratio, with respect to the entire amount of martensite; and the steel structure has an average effective crystal grain diameter of 5.0 μm or less.

公开(公告)号：US10711333B2

公开(公告)日：2020-07-14

申请号：US15516698

申请日：2015-10-29

申请人： JFE STEEL CORPORATION

发明人： Yoshiyasu Kawasaki ,  Hiroshi Matsuda ,  Takeshi Yokota ,  Takako Yamashita ,  Kazuhiro Seto

IPC分类号： C21D9/46 ,  C22C38/14 ,  C23C2/12 ,  C22C38/60 ,  C23C2/02 ,  C22C38/00 ,  C23C2/06 ,  C23C2/28 ,  B32B15/01 ,  B32B15/18 ,  B32B15/20 ,  C21D1/26 ,  C21D6/00 ,  C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C23C2/40 ,  C23F17/00 ,  C25D3/22

摘要： Disclosed is a steel sheet having a predetermined chemical composition and a steel microstructure that contains, in area ratio, 15% or more and 55% or less of polygonal ferrite and 15% or more and 30% or less of martensite, and that contains, in volume fraction, 12% or more of retained austenite, in which the polygonal ferrite, the martensite, and the retained austenite have a mean grain size of 4 μm or less, 2 μm or less, and 2 μm or less, respectively, and each have a mean grain aspect ratio of 2.0 or less, and in which a value obtained by dividing an Mn content in the retained austenite in mass % by an Mn content in the polygonal ferrite in mass % equals 2.0 or more.

公开(公告)号：US10704131B2

公开(公告)日：2020-07-07

申请号：US16082826

申请日：2017-03-24

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Koichi Nishizawa ,  Masaaki Omodaka

IPC分类号： C23C2/00 ,  C23C2/40 ,  C23C2/14 ,  C23C2/06

摘要： A continuous hot-dip plating machine includes: a sink roll provided in a plating bath and configured to upwardly change a transfer direction of the steel strip; a first support roll provided in the plating bath and located above the sink roll, the first support roll being in contact with a first surface of the steel strip in contact with the sink roll; and a second support roll provided in the plating bath and located above the first support roll, the second support roll being in contact with a second surface of the steel strip opposite the first surface. A diameter of the first support roll, a diameter of the second support roll, and a vertical distance between a rotation axis of the first support roll and a rotation axis of the second support roll satisfy specific conditions.

公开(公告)号：US10697052B2

公开(公告)日：2020-06-30

申请号：US15735337

申请日：2016-06-09

申请人： ArcelorMittal

发明人： Josee Drillet ,  Veronique Hebert

IPC分类号： C23C2/02 ,  C23C14/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/22 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  B32B15/01 ,  C21D8/04 ,  C21D9/46 ,  C21D9/48

摘要： The present invention provides a cold-rolled and annealed steel sheet of thickness between 0.7 mm and 2 mm, mechanical strength ranging from 1180 MPa to 1320 MPa, wherein the hole expansion ratio Ac % is greater than 20% and the bending angle is greater than or equal to 40°. The chemical composition includes, the contents being expressed as weight percent: 0.09%≤C≤0.11%, 2.6%≤Mn≤2.8%, 0.20%≤Si≤0.55%, 0.25%≤Cr

公开(公告)号：US10683561B2

公开(公告)日：2020-06-16

申请号：US15314934

申请日：2014-12-23

申请人： BAOSHAN IRON & STEEL CO.,LTD.

发明人： Jun Li ,  Ning Tan ,  Chuang Guan ,  Yuan Fang ,  Xinjian Ma

IPC分类号： C21D9/56 ,  B22D11/11 ,  C21D1/26 ,  C23C2/40 ,  C21D8/02 ,  C23C2/06 ,  C23C2/12 ,  B22D11/06 ,  C21D1/76 ,  C21D9/52

摘要： Method for directly producing a pickling-free hot-plated sheet strip product from molten steel comprising: obtaining a refined molten steel; thin strip continuous casting: a mixed gas of an inert gas and a reducing gas is used for protection in the billet casting process; hot rolling: the cast strip is levelled at a high temperature so as to improve the sheet shape and rolled to a suitable thickness so as to change the product specification, or provide a mechanical disruption action on the iron oxide skin on the surface of the cast strip; reduction annealing: a sectional reduction method is used to perform sectional reductions with the temperature held within two ranges, i.e., 450-600° C. and 700-1000° C., wherein the reduction is performed within a range of 450-600° C. for 1-5 minutes and within a range of 700-1000° C. for 1-3 minutes to remove the iron oxide skin produced in the previous procedure, the concentration of the reducing gas being not lower than 5%; and hot galvanization: after having been cooled in a protective atmosphere, the strip billet is brought into a zinc bath and hot-plated with zinc and other alloy, and then cooled and coiled. The present invention realizes a highly continuous production of a hot-plated product from molten steel with iron and steel, and hot plating with zinc or an alloy is directly performed without removing elementary iron produced by the reduction, so that the energy consumption in the middle stage can be saved and the recovery of metal reaches close to 100%.