公开(公告)号：US20230323492A1

公开(公告)日：2023-10-12

申请号：US18132521

申请日：2023-04-10

Applicant: United States Steel Corporation

Inventor： Yun Li ,  David L. Runner ,  Jonathan D. Youngblood ,  Scott R. Story

IPC: C21C7/068 ,  C21C5/52 ,  C21C7/00 ,  C21C7/06 ,  C21C7/064 ,  C22C38/00

CPC classification number: C21C7/068 ,  C21C5/52 ,  C21C7/0075 ,  C21C7/06 ,  C21C7/064 ,  C22C38/004

Abstract: The present disclosure provides a method of making non-grain oriented (NGO) electrical steel. The method includes tapping the liquid steel out of a primary steelmaking furnace. Deoxidizing the liquid steel before or after transferring the deoxidized liquid steel to a ladle metallurgy furnace. Removing sulfur at the ladle metallurgy furnace (LMF). Adding fluxes and deoxidizer to the ladle slag and/or skimming off ladle slag to prevent sulfur reversion. Transferring the liquid steel from the ladle metallurgy furnace to an RH degasser for carbon removal by blowing oxygen. Adding fluxes at the RH before oxygen blowing to fortify the bottom layer of the ladle slag to prevent sulfur reversion. The removal of oxygen and sulfur prior to transferring the liquid steel to the RH degasser facilitates nitrogen removal and prevents carbon pick up during the step of adding fluxes and arcing for sulfur removal if sulfur removal is carried out at the LMF after carbon removal at the RH degasser in the conventional process. Oxygen blowing at the RH also lowered the titanium pickup from the earlier desulfurization process. The ultra low levels of carbon, nitrogen, sulfur, and titanium in the NGO steel made using this method enabled the excellent magnetic properties achieved in the finishing NGO products.

公开(公告)号：US11732337B2

公开(公告)日：2023-08-22

申请号：US17325619

申请日：2021-05-20

Applicant: NORTHEASTERN UNIVERSITY

Inventor： Huabing Li ,  Zhouhua Jiang ,  Hao Feng ,  Lingfeng Xia ,  Hongchun Zhu ,  Shucai Zhang ,  Weichao Jiao

IPC: C22C38/00 ,  C21D6/00 ,  C22B9/18 ,  C21C7/00

CPC classification number: C22C38/001 ,  C21C7/0075 ,  C21D6/002 ,  C21D6/005 ,  C22B9/18 ,  C21D2211/001

Abstract: The present disclosure provides a method for producing a high nitrogen steel by a duplex melting process of a pressurized ladle refining and a pressurized electroslag remelting, which relates to the technical field of high nitrogen steel melting. In the present disclosure, the molten steel is subjected in sequence to a nitrogen alloying, a deep deoxidation and a deep desulfurization by adding a nickel-magnesium alloy and rare earth in the pressurized ladle furnace, and a combination of a blowing nitrogen from the bottom of the pressurized ladle and a pressurized nitriding at the interface of gas and the molten steel is used to achieve a high-efficiency nitrogen alloying, a uniform nitrogen distribution, and a decreased impurity content in the ingot; then the ingot is subjected to a pressurized electroslag remelting to obtain a high nitrogen steel.

公开(公告)号：US20180202012A1

公开(公告)日：2018-07-19

申请号：US15550821

申请日：2016-02-15

Applicant: Guram KASHAKASHVILI ,  Irakli JORDANIA ,  Irakli KASHAKASHVILI

Inventor： Guram KASHAKASHVILI ,  Irakli JORDANIA ,  Irakli KASHAKASHVILI

IPC: C21C5/52 ,  C21C7/00 ,  F27B3/18 ,  F27D3/12

CPC classification number: C21C5/52 ,  C21B13/0013 ,  C21C5/5217 ,  C21C7/0006 ,  C21C7/0025 ,  C21C7/0037 ,  C21C7/0075 ,  C21C7/076 ,  F27B3/18 ,  F27D3/12 ,  F27D3/16 ,  F27D3/18 ,  Y02P10/143 ,  Y02P10/216

Abstract: The invention relates to the field of metallurgy and can be used in the making of steel in a single installation that encompasses all of the stages of the making and refining of steel as well as the casting of steel from the installation. The present installation comprises: a casting ladle with two slide gates; a water-cooled roof with electrodes, which is docked to the ladle and is connected to a gas cleaner; a slag runner; dosing bins for adding fluxes and deoxidizers; charging pipes for adding charge materials; a hot metal pouring-in funnel; a jet for injecting natural gas and air or oxygen, which is comprised of coaxial pipes and is mounted in pouring nozzle of the slide gate which is intended for melting process; and, connected to an injection apparatus, a tubule for injecting slag-forming reagents together with an inert gas or nitrogen. The installation is provided with a conveyor, which has a fuel burner and is connected to the roof. In the installation, cavities formed during melting are filled by the adding of grinded scrap and/or pre-reduced pellets, which are heated by furnace exhaust gases and/or additional natural gas flames during their motion on the conveyor covered by the roof and water-cooled. The invention makes it possible to avoid heat loss, reduce fuel consumption and also increase the stability of the process of melting and treating a metal in a single modernized installation under automated conditions without deactivating the installation and removing the furnace roof.

公开(公告)号：US20180029111A1

公开(公告)日：2018-02-01

申请号：US15662977

申请日：2017-07-28

Applicant: AIDA ENGINEERING, LTD.

Inventor： Masaharu MURAMATSU ,  Shogo SHIBASAKI ,  Masataka YAHARA

IPC: B22D11/115 ,  B22D11/00

CPC classification number: B22D11/115 ,  B22D1/00 ,  B22D11/003 ,  B22D11/11 ,  B22D27/02 ,  C21C7/0075 ,  F27D27/00 ,  F27D2003/0054

Abstract: There is provided a metal molded body manufacturing apparatus for electromagnetically stirring metallic molten metal and molding a metal molded body. The metal molded body manufacturing apparatus includes: a die having an inclined side wall; and a moving magnetic field generation section that stirs the molten metal in the die, wherein the moving magnetic field generation section includes a magnetic body, and a coil wound around the magnetic body as a center, and an end surface of the magnetic body is disposed in parallel to an inner surface of the side wall.

公开(公告)号：US09752202B2

公开(公告)日：2017-09-05

申请号：US14400908

申请日：2013-05-13

Applicant: POSCO

Inventor： Ja Yong Choi ,  Seung Min Han ,  Sun Koo Kim ,  Hee Ho Lee ,  Sang Yuel Jung ,  Young Jong Seo

IPC: B22D41/00 ,  C21C7/00 ,  C21C7/076 ,  B22D11/118 ,  B22D41/08 ,  B22D1/00 ,  B22D11/116 ,  C21C7/06

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

Abstract: Provided are 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 pre-processing in a continuous casting process in a steel-making process. Also, provided is 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.

公开(公告)号：US20170247773A1

公开(公告)日：2017-08-31

申请号：US15592693

申请日：2017-05-11

Applicant: JFE STEEL CORPORATION

Inventor： Satoshi KINOSHIRO ,  Toshiyuki ITO ,  Ryo KAWABATA ,  Toshiro ISHIGE ,  Kyoko FUJIMOTO ,  Masao INOSE

IPC: C21C7/064 ,  G01N33/00 ,  C21C7/06 ,  G01N21/64 ,  C21C7/00 ,  C21C7/10

CPC classification number: C21C7/0645 ,  C21C1/02 ,  C21C7/0006 ,  C21C7/0037 ,  C21C7/0075 ,  C21C7/0087 ,  C21C7/06 ,  C21C7/064 ,  C21C7/10 ,  C21C2007/0093 ,  C21C2300/08 ,  F27D19/00 ,  F27D21/00 ,  G01N21/64 ,  G01N21/645 ,  G01N33/0042 ,  Y02A50/248

Abstract: A method for desulfurizing molten steel comprising taking a sample out from molten steel after tapping from a converter or during secondary refining and analyzing the sample rapidly with high accuracy by a method comprising a high frequency induction heating step wherein the sample is combusted and oxidized under the high frequency induction heating in an oxygen atmosphere having an oxygen purity of 99.5 vol % or more to convert S in the sample into SO2 and an analyzing step wherein SO2-containing gas produced in the high frequency induction heating step is analyzed through an ultraviolet fluorescence method to quantify S concentration of the sample.

公开(公告)号：US20160369361A1

公开(公告)日：2016-12-22

申请号：US15183020

申请日：2016-06-15

Applicant: Larry J Epps

Inventor： Larry J Epps

IPC: C21C7/00 ,  F27D3/16 ,  F27D3/00 ,  C21C7/064 ,  C21C7/072

CPC classification number: C21C7/0037 ,  C21C5/4613 ,  C21C7/0075 ,  C21C7/064 ,  C21C7/072 ,  F27D3/0033 ,  F27D3/16 ,  F27D2003/169

Abstract: A coaxial material-stirring lance (40) and method used to treat molten metal in a ladle, the lance having a stirring gas chamber (48), and a plurality of gas permeable ports (50 52) arranged as upper and lower port arrays along a length of the gas chamber, and at least one material chamber (43) positioned inside and coaxial with the gas chamber and terminating in at least one material ports (60). In another embodiment, a second material chamber is included inside the gas chamber, parallel to and immediately adjacent the material chamber. In use, the coaxial material-stirring lance is lowered into the ladle of molten metal, and gas and material are both introduced into a respective chamber. Gas mixes material through the molten metal, causing impurities to be removed from the metal.

Abstract translation: 一种用于处理钢包中的熔融金属的同轴材料搅拌枪（40）和方法，所述喷枪具有搅拌气室（48），以及多个气体渗透口（5052），其布置为沿上下端口阵列 所述气室的长度以及至少一个材料室（43），所述至少一个材料室位于所述气室的内部并与所述气室同轴并且终止于至少一个材料端口（60）。 在另一个实施例中，第二材料室包括在气室内部，平行于并且紧邻材料室。 在使用中，同轴材料搅拌喷枪下降到熔融金属的钢包中，并且气体和材料都被引入到相应的室中。 气体通过熔融金属混合材料，导致从金属中除去杂质。

公开(公告)号：US20130305880A1

公开(公告)日：2013-11-21

申请号：US13920172

申请日：2013-06-18

Applicant: SINVENT AS

Inventor： Oystein GRONG ,  Casper VAN DER EIJK ,  Gabriella Maria TRANELL ,  Leiv Olav KOLBEINSEN

IPC: B22D1/00 ,  B22D11/116

CPC classification number: B22D1/00 ,  B22D11/108 ,  B22D11/11 ,  B22D11/111 ,  B22D11/116 ,  C21C7/0006 ,  C21C7/0037 ,  C21C7/0056 ,  C21C7/0075

Abstract: The present invention concerns a new type of grain refiners for steel, in the form of a particulate composite material, containing a high volume fraction of tailor-made dispersed particles, with the purpose of acting as potent heterogeneous nucleation sites for iron crystals during solidification and subsequent thermo-mechanical treatment of the steel. The material comprises a position of particles of XaSb or XaOb and the element(s) X, where X is one or more elements selected from the group Ce, La, Pr, Nd, Y, Ti, Al, Zr, Ca, Ba, Sr, Mg, Si, Mn, Cr, V, B, Nb, Mo and Fe, and S is sulphur, (O is oxygen), wherein said material additionally contains oxygen, sulphur, carbon and nitrogen, wherein the sulphur (or oxygen) content is between 2 and 30% by weight of said material, while the total content of oxygen (or sulphur), carbon and nitrogen and said other elements selected from the group X is between 98 and 70% by weight of said material, and the said material contains a high volume fraction of finely dispersed XaSb or XaOb particles embedded in a metallic matrix X. The invention further concerns methods for production and use of the composite material.

Abstract translation: 本发明涉及一种新型的用于钢的晶粒细化剂，其为颗粒状复合材料形式，其含有大量的定制分散颗粒，其目的是作为固化期间铁晶体的有效非均相成核位点，以及 随后对钢的热机械处理。 该材料包括XaSb或XaOb颗粒的位置和X元素，其中X是选自Ce，La，Pr，Nd，Y，Ti，Al，Zr，Ca，Ba， Sr，Mg，Si，Mn，Cr，V，B，Nb，Mo和Fe，S为硫，（O为氧），其中所述材料另外含有氧，硫，碳和氮， ）含量在所述材料的2至30重量％之间，而氧（或硫），碳和氮以及选自X组的所有其它元素的总含量为所述材料的98至70重量％，以及 所述材料含有高体积分数的嵌入金属基体X中的精细分散的XaSb或XaOb颗粒。本发明还涉及复合材料的生产和使用方法。

公开(公告)号：US08486175B2

公开(公告)日：2013-07-16

申请号：US12227826

申请日：2007-05-31

Applicant: Øystein Grong ,  Casper Van Der Eijk ,  Gabriella Maria Tranell ,  Leiv Olav Kolbeinsen

Inventor： Øystein Grong ,  Casper Van Der Eijk ,  Gabriella Maria Tranell ,  Leiv Olav Kolbeinsen

IPC: C22C29/00 ,  C22C32/00 ,  C22C38/60 ,  C22B9/10 ,  B22D11/10

CPC classification number: B22D1/00 ,  B22D11/108 ,  B22D11/11 ,  B22D11/111 ,  B22D11/116 ,  C21C7/0006 ,  C21C7/0037 ,  C21C7/0056 ,  C21C7/0075

Abstract: The present invention concerns a new type of grain refiners for steel, in the form of a particulate composite material, containing a high volume fraction of tailor-made dispersed particles, with the purpose of acting as potent heterogeneous nucleation sites for iron crystals during solidification and subsequent thermo-mechanical treatment of the steel. The material comprises a composition of particles of XaSb or XaOb and the element(s) X, where X is one or more elements selected from the group Ce, La, Pr, Nd, Y, Ti, Al, Zr, Ca, Ba, Sr, Mg, Si, Mn, Cr, V, B, Nb, Mo and Fe, and S is sulphur, (O is oxygen), wherein said material additionally contains oxygen, sulphur, carbon and nitrogen, wherein the sulphur (or oxygen) content is between 2 and 30% by weight of said material, while the total content of oxygen (or sulphur), carbon and nitrogen and said other elements selected from the group X is between 98 and 70% by weight of said material, and the said material contains a high volume fraction of finely dispersed XaSb or XaOb particles embedded in a metallic matrix X. The invention further concerns methods for production and use of the composite material.

Abstract translation: 本发明涉及一种新型的用于钢的晶粒细化剂，其为颗粒状复合材料形式，其含有大量的定制分散颗粒，其目的是作为固化期间铁晶体的有效非均相成核位点，以及 随后对钢的热机械处理。 该材料包含XaSb或XaOb的颗粒组合物和X元素，其中X是选自Ce，La，Pr，Nd，Y，Ti，Al，Zr，Ca，Ba， Sr，Mg，Si，Mn，Cr，V，B，Nb，Mo和Fe，S为硫，（O为氧），其中所述材料另外含有氧，硫，碳和氮， ）含量在所述材料的2至30重量％之间，而氧（或硫），碳和氮以及选自X组的所有其它元素的总含量为所述材料的98至70重量％，以及 所述材料含有高体积分数的嵌入金属基体X中的精细分散的XaSb或XaOb颗粒。本发明还涉及复合材料的生产和使用方法。

公开(公告)号：US20120304820A1

公开(公告)日：2012-12-06

申请号：US13572759

申请日：2012-08-13

Applicant: Ichiro Sato ,  Kaichiro Ishido ,  Tomomi Mori ,  Toshihiro Irie ,  Kazuya Kodama ,  Kiyoshi Kawakami ,  Shuhei Kitano

Inventor： Ichiro Sato ,  Kaichiro Ishido ,  Tomomi Mori ,  Toshihiro Irie ,  Kazuya Kodama ,  Kiyoshi Kawakami ,  Shuhei Kitano

IPC: C21C5/52

CPC classification number: C21C7/0075 ,  C21C7/04 ,  C21C7/06 ,  C21C7/10

Abstract: A process for producing a high-cleanliness steel which can produce, without relying upon a high-cost remelting process, steel products having cleanliness high enough to satisfy requirements for properties of mechanical parts used under severe environmental conditions. The production process comprises the steps of: transferring a molten steel produced in an arc melting furnace or a converter to a ladle furnace to refine the molten steel; subjecting the molten steel to circulation-type degassing; and casting the molten steel into an ingot, wherein, in transferring the molten steel to the ladle furnace, a deoxidizer including aluminum and silicon, is added to previously deoxidize the molten steel, that is, to perform tapping deoxidation before refining in the ladle refining furnace.

Abstract translation: 一种高清洁度钢的制造方法，其能够在不依赖于高成本重熔工艺的情况下生产具有足够高的清洁度的钢产品，以满足在恶劣环境条件下使用的机械部件的性能要求。 该生产方法包括以下步骤：将在电弧熔化炉或转炉中生产的钢水转移到钢包炉中以精炼钢水; 对钢水进行循环型除气; 并将钢水铸造成锭，其中，在将钢水转移到钢包炉中时，添加包括铝和硅的脱氧剂，以预先使钢水脱氧，即在钢包精炼中精炼之前进行脱水脱氧 炉。