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    A METHOD FOR THE MODIFICATION OF PRIMARY CARBIDE PRECIPITATES IN CAST IRON ALLOYS
    2.
    发明公开
    A METHOD FOR THE MODIFICATION OF PRIMARY CARBIDE PRECIPITATES IN CAST IRON ALLOYS 审中-公开

    公开(公告)号：EP4428259A1

    公开(公告)日：2024-09-11

    申请号：EP23165618.2

    申请日：2023-03-30

    申请人： Akademia Gorniczo-Hutnicza im. Stanislawa Staszica w Krakowie

    发明人： TECZA, Grzegorz ,  SZCZESNY, Andrzej

    IPC分类号： C22C33/08 ,  C21C1/08 ,  C21C1/10 ,  C22C33/10 ,  C22C38/00 ,  C22C37/04

    CPC分类号： C22C33/10 ,  C21C1/08 ,  C21C1/105 ,  C22C33/08 ,  C22C38/00 ,  C22C37/04

    摘要： The present invention relates to a method of modifying primary carbide precipitates in casting iron alloys, wherein: a) charge material in the form of metallurgical pig iron of known composition or other scrap, or a mixture thereof, is supplied to the furnace; b) the charge material is melted by heating to the temperature required to melt all the components, stirred until the temperature is equalized throughout the liquid metal, then deoxidized, after which the chemical composition of the melted charge material is determined; c) if differences are found between the chemical composition of the charge material and the preset chemical composition of the casting material, the chemical composition of the liquid metal in the furnace is supplemented to the desired preset composition, gradually entering into the deoxidized liquid metal, so as not to lower its temperature, the required alloying additives in appropriate amounts, excluding carbide-forming elements including Ti, Nb, V, W, Zr, Hf and Ta, and after melting all the components, the metal volume in the furnace is stirred until the temperature is equalized; d) a magnesium modifier is added in such a selected amount that the Mg content in the liquid metal is 0.01 - 0.05 wt%; e) at least one carbide-forming element, selected from Ti, Nb, V, W, Zr, Hf and Ta, is gradually introduced into the liquid metal, so as not to lower its temperature, in an amount corresponding to the preset chemical composition of the cast metal; f) after introducing the last portion of at least one carbide-forming element and thus obtaining the preset chemical composition, the liquid metal is soaking in the furnace to equalize the chemical composition in its entire volume and to obtain a uniform temperature of the metal draining into the ladle; g) the draining of the metal into the ladle is carried out; h) magnesium modifier is added again to the liquid metal in the ladle in such a selected amount that the Mg content in the liquid metal is 0.01 - 0.05 wt%; and i) the liquid metal of the specified chemical composition is cast from the ladle into a mold.

    IRON-BASED ALLOY AND METHOD FOR PRODUCING IRON-BASED ALLOY
    7.
    发明公开
    IRON-BASED ALLOY AND METHOD FOR PRODUCING IRON-BASED ALLOY 审中-公开

    公开(公告)号：EP3848478A1

    公开(公告)日：2021-07-14

    申请号：EP19857077.2

    申请日：2019-09-02

    申请人： Tohoku University

    发明人： YAMANAKA Kenta ,  CHIBA Akihiko

    IPC分类号： C22C38/00 ,  C21D6/00 ,  C22C37/08 ,  C22C38/22 ,  C22C38/44

    摘要： Provided are an iron-based alloy having excellent corrosion resistance and high strength and a method of manufacturing the iron-based alloy. The iron-based alloy includes Cr: 10 to 22 mass%, W: 1 to 12 mass%, and C: 0.1 to 2.3 mass%, with the remainder being unavoidable impurities and Fe, and is composed of a cast material having a structure composed mainly of austenite or a quenched material having a structure composed mainly of martensite and in which carbides are precipitated. The iron-based alloy may further include Cu: 0.5 to 6 mass% and/or Ni: 0.5 to 2.5 mass%, and may further include at least one of Al, Mo, and Si in an amount of 1 to 3 mass%.