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    MOLTEN STEEL DENITRIFICATION METHOD, SIMULTANEOUS DENITRIFICATION AND DESULFURIZATION TREATMENT METHOD, AND STEEL PRODUCTION METHOD
    1.
    发明公开
    MOLTEN STEEL DENITRIFICATION METHOD, SIMULTANEOUS DENITRIFICATION AND DESULFURIZATION TREATMENT METHOD, AND STEEL PRODUCTION METHOD 审中-实审

    公开(公告)号：EP4353845A1

    公开(公告)日：2024-04-17

    申请号：EP22819992.3

    申请日：2022-05-12

    申请人： JFE Steel Corporation

    发明人： NEGISHI, Hidemitsu ,  YAMADA, Rei ,  TADA, Chikashi

    IPC分类号： C21C7/00 ,  C21C7/072 ,  C21C7/10

    CPC分类号： C21C7/10 ,  C21C7/00 ,  C21C7/072 ,  Y02P10/20

    摘要： Proposed is a method in which a denitrification treatment that allows an extremely low nitrogen concentration range to be stably and quickly reached is performed, or further this denitrification treatment and a desulfurization treatment are performed within a single treatment, such that denitrification, or denitrification and desulfurization, of molten steel can be efficiently performed. This molten steel denitrification method is a molten steel denitrification treatment in which CaO-and-Al2O3-containing slag 4 is formed on top of molten steel 3 charged in a vessel 1 and an oxygen-containing gas is blown from above the slag, while the slag and the molten steel are brought into contact with each other to remove nitrogen in the molten steel. This method is characterized in that an Al concentration in the molten steel is kept at or higher than a value determined by Formula (1) according to a stirring power density, and that the oxygen-containing gas is blown such that a ratio between a thickness Ls0 of the slag and a depth Ls of a depression in the slag resulting from blowing of the oxygen-containing gas meets Ls/Ls0 ≥ 1: Al concentration (mass%) in molten steel = -0.072 × ln (stirring power density (W/t)) + 0.5822 ···· (1)

    NON-ORIENTED ELECTROMAGNETIC STEEL SHEET AND METHOD FOR PRODUCING SAME
    3.
    发明公开
    NON-ORIENTED ELECTROMAGNETIC STEEL SHEET AND METHOD FOR PRODUCING SAME 审中-公开
    非取向电磁钢板及其制造方法

    公开(公告)号：EP3243921A1

    公开(公告)日：2017-11-15

    申请号：EP15876961.2

    申请日：2015-11-17

    申请人： JFE Steel Corporation

    发明人： NAKANISHI Tadashi ,  NAKAJIMA Hiroaki ,  OKUBO Tomoyuki ,  ODA Yoshihiko

    IPC分类号： C22C38/00 ,  C21D8/12 ,  C22C38/06 ,  C22C38/60 ,  H01F1/16 ,  C21C7/00 ,  C21C7/04

    CPC分类号： C22C38/002 ,  C21C7/00 ,  C21C7/04 ,  C21D8/1205 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1272 ,  C22C38/00 ,  C22C38/001 ,  C22C38/004 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/16 ,  C22C38/18 ,  C22C38/34 ,  C22C38/60 ,  H01F1/16 ,  H01F1/342

    摘要： When a non-oriented electrical steel sheet is produced by hot rolling a slab containing, by mass%, C: not more than 0.0050%, Si: 1.5-5.0%, Mn: 0.20-3.0%, sol. Al: not more than 0.0050%, P: not more than 0.2%, S: not more than 0.0050% and N: not more than 0.0040% to form a hot rolled sheet, cold rolling the hot rolled sheet without conducting a hot band annealing and then subjecting to a finish annealing, a compositional ratio of CaO in oxide-based inclusions existing in the slab defined by CaO/ (SiO 2 + Al 2 O 3 + CaO) is set to not less than 0.4 and/or a compositional ratio of Al 2 O 3 defined by Al 2 O 3 / (SiO 2 + Al 2 O 3 + CaO) is set to not less than 0.3, and a coiling temperature in the hot rolling is set to not lower than 650 °C, whereby the non-oriented electrical steel sheet having an excellent recyclability, a high magnetic flux density and a low iron loss is obtained.

    摘要翻译： 通过将以质量％计含有C：0.0050％以下，Si：1.5〜5.0％，Mn：0.20〜3.0％的溶胶的板坯通过热轧制成无取向电工钢板时， Al：不超过0.0050％，P：不超过0.2％，S：不超过0.0050％，N：不超过0.0040％，以形成热轧板，冷轧该热轧板而不进行热带退火 然后进行最终退火，将由CaO /（SiO 2 + Al 2 O 3 + CaO）定义的板坯中存在的氧化物系夹杂物中的CaO的组成比设定为不小于0.4，和/或由 Al 2 O 3 /（SiO 2 + Al 2 O 3 + CaO）设定为0.3以上，将热轧时的卷取温度设定为650℃以上，由此得到再利用性优异的无方向性电磁钢板， 获得了磁通密度和低铁损。

    HIGH CLEANLINESS MOLTEN STEEL PRODUCTION METHOD AND REFINING DEVICE
    4.
    发明公开
    HIGH CLEANLINESS MOLTEN STEEL PRODUCTION METHOD AND REFINING DEVICE 审中-公开
    HERSTELLUNGSVERFAHRENFÜRHOCHREINE STAHLSCHMELZE UND RAFFINATIONSVORRICHTUNG

    公开(公告)号：EP2851439A1

    公开(公告)日：2015-03-25

    申请号：EP13790587.3

    申请日：2013-05-13

    申请人： Posco

    发明人： CHOI, Ja Yong ,  HAN, Seung Min ,  KIM, Sun Koo ,  LEE, Hee Ho ,  JUNG, Sang Yuel ,  SEO, Young Jong

    IPC分类号： C21C7/00

    CPC分类号： C21C7/00 ,  B22D1/00 ,  B22D11/116 ,  B22D11/118 ,  B22D41/00 ,  B22D41/08 ,  C21C7/0075 ,  C21C7/06 ,  C21C7/076 ,  Y02P10/242

    摘要： The present invention relates to a method and a refining device for producing molten steel of outstanding cleanliness, and more particularly provides a method and device for refining inclusions by forming droplets from molten steel and dropping same into slag during preprocessing in a continuous casting process in a steel-making process. Also, the present invention provides a method for producing high cleanliness molten steel comprising a molten-steel supply device for supplying molten steel and a molten-steel refining device for containing and refining molten steel poured into the molten-steel supply device, wherein the method comprises: a molten-steel pouring step in which molten steel is poured from the molten-steel supply device into the molten-steel refining device; a droplet-forming step in which the molten steel which has been poured in is formed into droplets in the molten-steel refining device; a slag-pass-through step in which the molten steel which has been formed into droplets is dropped so as to pass through slag; and an inclusion-removing step in which residual inclusions in the molten steel, which has been formed into droplets, are removed while passing through the slag.

    摘要翻译： 本发明涉及一种具有优异清洁度的钢水生产方法和精炼装置，更具体地说，提供了一种用于在连续铸造工艺中在预处理过程中从钢水中形成液滴并将其滴入炉渣中来精炼夹杂物的方法和装置 炼钢工艺。 另外，本发明提供一种高清洁度钢水的制造方法，其特征在于，包括供给钢水的钢水供给装置和钢水供给装置的钢水精炼装置， 包括：钢水浇注步骤，其中钢水从钢水供应装置注入钢水精炼装置; 液滴形成步骤，其中已经注入的钢水在钢水精炼装置中形成液滴; 通过使通过炉渣而成形为液滴的钢水落渣的渣渣通过工序; 以及夹杂物除去工序，其中已经形成为液滴的钢水中的残留夹杂物在通过炉渣时被除去。

    Gas blowing plug and manufacturing method therefor
    8.
    发明公开
    Gas blowing plug and manufacturing method therefor 有权
    天然气吹气塞及其制造方法

    公开(公告)号：EP1077266A3

    公开(公告)日：2002-11-13

    申请号：EP00115729.6

    申请日：2000-07-21

    申请人： TOKYO YOGYO KABUSHIKI KAISHA

    发明人： Aramaki, Keizo, c/o Tokyo Yogyo K.K. ,  Yoshida, Tsuyoshi, c/o Tokyo Yogyo K.K.

    IPC分类号： C21C7/072 ,  B22D1/00 ,  C21C5/48

    CPC分类号： B22D1/005 ,  C21C5/48 ,  C21C7/00

    摘要： There are provided a gas blowing plug with a long life and a manufacturing method therefor. The gas blowing plug for blowing gas from the bottom of a molten metal vessel comprises a slit-shaped gas passage ranging from the bottom to the top of the plug. The gas passage is formed by a continuous or discontinuous slit-shaped gas passage in the horizontal cross section of the plug, and is formed by a slit-shaped gas passage continuous from the bottom to the top of the plug and a discontinuous slit-shaped gas passage in the vertical cross section of the plug. The cross-sectional shape of a tubular body can be a star shape, for example.