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    CONTINUOUS STEEL CASTING METHOD
    2.
    发明公开
    CONTINUOUS STEEL CASTING METHOD 审中-公开

    公开(公告)号：EP3488947A1

    公开(公告)日：2019-05-29

    申请号：EP17853092.9

    申请日：2017-09-20

    申请人： JFE Steel Corporation

    发明人： ARAMAKI Norichika ,  FURUMAI Kohei ,  MIKI Yuji

    IPC分类号： B22D11/04 ,  B22D11/059 ,  B22D11/128 ,  B22D11/16 ,  B22D11/20

    摘要： Surface cracking caused by nonuniform cooling of a solidifying shell at the initial stage of solidification is prevented, and the occurrence of center segregation in a thicknesswise central portion of a strand is reduced.
    Metal-filled portions with different thermal conductivity filled with a metal having a thermal conductivity that differs by at least 20% from the thermal conductivity of a mold copper plate of a continuous casting mold are disposed on an inner wall surface of the mold copper plate in a region extending from a position at least 20 mm above the position of a meniscus to a position at least 50 mm and at most 200 mm below the position of the meniscus. The area fraction of the total area of the metal-filled portions with different thermal conductivity relative to the area of the inner wall surface on which the plurality of metal-filled portions with different thermal conductivity are disposed is from 10% to 80% inclusive. A distance (D1) and an oscillation mark pitch (OMP) that is derived from the frequency of oscillation (f) and a casting speed (Vc) satisfy formula (1) below, and a distance (D2) satisfies formula (2) below. D 1 ≤ OMP = Vc × 1000 / f D 2 ≤ 4 ⁢ r In formula (2), r is the radius (mm) of a circle having a center at the center of gravity of one of the metal-filled portions with different thermal conductivity and having the same area as the one of the metal-filled portions with different thermal conductivity.

    METHOD FOR OXYGEN TRANSMISSION SMELTING OF MOLTEN IRON, AND TOP-BLOW LANCE
    4.
    发明公开
    METHOD FOR OXYGEN TRANSMISSION SMELTING OF MOLTEN IRON, AND TOP-BLOW LANCE 审中-公开

    公开(公告)号：EP3730632A1

    公开(公告)日：2020-10-28

    申请号：EP18893243.8

    申请日：2018-11-08

    申请人： JFE Steel Corporation

    发明人： ODA Nobuhiko ,  OKUYAMA Goro ,  AMANO Shota ,  NAKASE Kenji ,  TAKAHASHI Yukio ,  HINO Yuta ,  KIKUCHI Naoki ,  MIKI Yuji

    IPC分类号： C21C5/32 ,  C21C5/46

    摘要： In a method for oxygen-blowing refining of molten iron, an oxygen-containing gas as a main supply gas is supplied from an inlet side of a blowing nozzle for the oxygen-containing gas passing through an outer shell of the top-blowing lance and blown from the blowing nozzle while a control gas is jetted toward inside of the blowing nozzle for at least part of a period of the oxygen-blowing refining from a spout arranged in a side face of the nozzle at a site where the cross-sectional area of the nozzle minimum takes the minimum in the axial direction of the nozzle or a neighborhood thereof so that at least part of the spout exists in each space formed by dividing into two portions by an arbitrary plane passing through a central axis of the nozzle.

    METHOD FOR REFINING MOLTEN STEEL IN VACUUM DEGASSING EQUIPMENT
    6.
    发明公开
    METHOD FOR REFINING MOLTEN STEEL IN VACUUM DEGASSING EQUIPMENT 审中-公开

    公开(公告)号：EP3421620A1

    公开(公告)日：2019-01-02

    申请号：EP17756317.8

    申请日：2017-02-15

    申请人： JFE Steel Corporation

    发明人： FUJII Yusuke ,  NAKAI Yoshie ,  KIKUCHI Naoki ,  SHIBUTA Naoya ,  NAGAI Shinichi ,  MAEDA Takahiko ,  MIKI Yuji

    IPC分类号： C21C7/10 ,  C21C7/04 ,  C21C7/064 ,  C21C7/072 ,  C21C7/00 ,  C21C7/068

    摘要： In a refining method using vacuum degassing equipment in which powders such as manganese ore and a CaO-based desulfurization agent are heated with a flame formed at the leading end of a top blowing lance and are thus thrown to molten steel, the yield of the addition of the powders and the heat transfer efficiency are enhanced.
    A molten steel refining method of the present invention includes throwing a powder to molten steel 3 while heating the powder with a flame formed by combustion of a hydrocarbon gas at the leading end of a top blowing lance 13. The lance height of the top blowing lance (the distance between the static bath surface of the molten steel and the leading end of the lance) is controlled to 1.0 to 7.0 m, and the dynamic pressure P of a jet flow ejected from the top blowing lance calculated from equation (1) below is controlled to 20.0 kPa or more and 100.0 kPa or less. P = ρ g × U 2 /2 ··· (1) wherein P is the dynamic pressure (kPa) of the jet flow at an exit of the top blowing lance, ρ g the density (kg/Nm 3 ) of the jet flow, and U the velocity (m/sec) of the jet flow at the exit of the top blowing lance.

    STEEL CONTINUOUS CASTING METHOD
    9.
    发明公开
    STEEL CONTINUOUS CASTING METHOD 审中-公开

    公开(公告)号：EP3572163A1

    公开(公告)日：2019-11-27

    申请号：EP17903688.4

    申请日：2017-03-29

    申请人： JFE Steel Corporation

    发明人： ODAGAKI Tomoya ,  ARAMAKI Norichika ,  MIKI Yuji ,  KIKUCHI Naoki

    IPC分类号： B22D11/20

    摘要： A strand is produced in which centerline segregation is negligible and which, therefore, can meet the recent rigorous demands for the quality of steel products.
    A continuous steel casting method includes producing a strand. The producing of the strand includes pouring molten steel into a mold of a continuous casting machine and withdrawing a solidified shell from the mold, the solidified shell being a solidified portion of the molten steel. The method includes applying a static magnetic field to at least a portion of a region of the strand, the strand being in the continuous casting machine, the region being a region where a solid fraction fs at a thickness-wise middle position of the strand is in a range of formula (1) below, the static magnetic field having a magnetic field strength of greater than or equal to 0.15 T and being in a direction orthogonal to a direction in which the strand is withdrawn, the static magnetic field being applied at an application time ratio of greater than or equal to 10%, the application time ratio being defined by formula (2) below. Application time ratio % = Time period during which static magnetic field is applied to strand min × 100 / Time period from time at which solid fraction at thickness-wise middle position of strand exceeds 0 to time at which solid fraction reaches 0.3 min

    CONTINUOUS CASTING MOLD AND METHOD FOR CONTINUOUS CASTING OF STEEL
    10.
    发明公开
    CONTINUOUS CASTING MOLD AND METHOD FOR CONTINUOUS CASTING OF STEEL 审中-公开

    公开(公告)号：EP3530373A1

    公开(公告)日：2019-08-28

    申请号：EP17861714.8

    申请日：2017-10-16

    申请人： JFE Steel Corporation

    发明人： FURUMAI Kohei ,  ARAMAKI Norichika ,  MIKI Yuji

    IPC分类号： B22D11/04 ,  B22D11/059 ,  B22D11/22

    摘要： In a continuous casting mold including dissimilar material-filled layers formed of a metal or nonmetal having a thermal conductivity different from that of a mold copper plate, which are disposed on an inner wall surface of the mold, the number of usable times is extended.
    A continuous casting mold according to the present invention includes recessed portions disposed partially or entirely in a region of an inner wall surface of a water-cooled copper mold from at least a position located at a meniscus to a position located 20 mm lower than the meniscus, and dissimilar material-filled layers formed by filling the corresponding recessed portions with a metal or nonmetal having a thermal conductivity different from that of a mold copper plate constituting the water-cooled copper mold, in which the shape of each of the recessed portions at a surface of the mold copper plate, at an arbitrary position of the recessed portion, is a curved surface having a curvature in every direction.