公开(公告)号：US20220324017A1

公开(公告)日：2022-10-13

申请号：US17639848

申请日：2020-09-17

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Shinichi FUKUNAGA ,  Takuya OKADA ,  Toshio KAKU ,  Hiroki FURUKAWA

IPC: B22D41/58 ,  B22D41/16 ,  B22D11/11 ,  B22D1/00

Abstract: A tundish upper nozzle structure and a continuous casting method make it possible to cause inclusions to float within a tundish. A flange-shaped member having an outside dimension greater than that of an upper end of a tundish upper nozzle is provided along a part or the entirety of the circumference of the upper end of the tundish upper nozzle, and one or more gas discharge holes are provided in one or more of the following surfaces: a lower surface, an outer peripheral surface and a top surface of the flange-shaped member, and a region of an outer peripheral surface of the tundish upper nozzle below the flange-shaped member. A length in the tundish upper nozzle structure is adjusted to cause almost all gas to float upwardly, or to adjust the flow rate of gas flowing downwardly toward the inner bore of the tundish upper nozzle, and the flow rate of gas floating upwardly.

公开(公告)号：US20220134420A1

公开(公告)日：2022-05-05

申请号：US17424301

申请日：2020-01-15

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Shinichi FUKUNAGA ,  Kazuhisa KATSUKI ,  Junya YANO ,  Hiroki FURUKAWA

IPC: B22D41/50

Abstract: It is intended to provide a flat immersion nozzle capable of stabilizing a molten steel discharge flow to stabilize an in-mold bath surface, i.e., reduce the fluctuation of the in-mold bath surface. Provided is an immersion nozzle having a flat portion whose inner bore has a thickness and a width greater than the thickness, wherein two lateral protrusions each protruding in a thickness direction are provided on each of opposed walls of the flat portion extending in a width direction. The lateral protrusions are arranged at axial symmetrical positions with respect to a longitudinal central axis of the width-directionally extending walls, in pairs, such that each of them extends obliquely downwardly in the width direction, wherein two pairs of the lateral protrusions are arranged, respectively, on the opposed width-directionally extending walls, in opposed relation.

公开(公告)号：US11235384B2

公开(公告)日：2022-02-01

申请号：US16475174

申请日：2017-12-08

Applicant: KROSAKIHARIMA CORPORATION ,  NIPPON STEEL CORPORATION

Inventor： Shinichi Fukunaga ,  Kouji Kawarada ,  Kohei Tani ,  Masashi Oikawa

IPC: B22D41/24 ,  B22D11/10 ,  B22D41/42

Abstract: In a sliding nozzle comprising three plates consisting of an upper plate, an intermediate plate capable of a sliding movement, and a lower plate, it is intended to suppress adhesion and deposition of metal oxides and others on wall surfaces of inner bores of the three plates. The intermediate plate has: a first inclined portion whose surface defines a slidingly closing directional leading-side wall surface of an inner bore thereof and extends obliquely downwardly in a diametrically contracting direction; a second inclined portion whose surface defines an upper part of a slidingly closing directional trailing-side wall surface of the inner bore thereof and extends obliquely downwardly in a diametrically contracting direction, and a third inclined portion whose surface defines a lower part of the slidingly closing directional trailing-side wall surface of the inner bore thereof and extends obliquely downwardly in a diametrically expanding direction.

公开(公告)号：US20210001398A1

公开(公告)日：2021-01-07

申请号：US16978270

申请日：2019-02-13

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Kouji KAWARADA ,  Kouichi TACHIKAWA

IPC: B22D41/56

Abstract: Provided is a sealing block installation structure capable of preventing the occurrence of a gap between a nozzle or plug installed in a bottom portion of a molten metal vessel and a plate or the like located on the lower side of the nozzle or plug, and a gap between the nozzle or plug and a sealing block located on the upper side of or on the outer peripheral side of the nozzle or plug. In the seating block installation structure, a seating block 2 disposed to surround a nozzle for discharging therethrough molten metal downwardly from the bottom portion of the molten metal vessel or a plug is fixed to a shell of the bottom portion of the molten metal vessel by a connecting member 3.

公开(公告)号：US10799950B2

公开(公告)日：2020-10-13

申请号：US16070934

申请日：2016-11-09

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Shinichi Fukunaga ,  Takahiro Kuroda ,  Takashi Sadano ,  Takuya Okada ,  Arito Mizobe

IPC: B22D41/50 ,  B22D11/10

Abstract: A nozzle structure for discharging molten steel with improved sealing performance. The nozzle structure comprises: a molten steel discharge path having an inner bore; and one or more joints through which the molten steel discharge path is divided at one or more positions in a orthogonal direction with respect to an upward-downward direction of discharge of molten steel, and which join the molten steel discharge path. An inner bore sleeve is formed of a refractory material, and provided on an inner bore surface of the nozzle structure to extend in the upward-downward direction across at least one of the joints.

公开(公告)号：US10125051B2

公开(公告)日：2018-11-13

申请号：US15566818

申请日：2016-04-01

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Jun Sugawara

IPC: C04B35/195

Abstract: A cordierite-based sintered body comprises cordierite as a primary crystal phase and LaMgAl11O19 as a secondary crystal phase, wherein a ratio ILMA (114)/IMAS (004) is in the range of 0.01 to 0.8, where the ILMA (114) denotes a peak intensity of a (114) plane of LaMgAl11O19 as measured by powder X-ray diffractometry, and the IMAS (004) denotes a peak intensity of a (004) plane of cordierite as measured by powder X-ray diffractometry. The disclosure is intended to enhance mechanical property and improve complex and fine processability for a cordierite-based sintered body without compromising low thermal expansibility, high dimensional long-term stability, high stiffness (high elastic modulus) and precision polishing characteristic.

公开(公告)号：US09821371B2

公开(公告)日：2017-11-21

申请号：US14777909

申请日：2014-03-19

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Katsumi Morikawa ,  Akinari Sasaki ,  Taro Makino ,  Ling Li

IPC: B22D41/08 ,  B22D41/54 ,  C04B35/01 ,  C04B35/043 ,  C04B35/106 ,  C04B35/482

CPC classification number: B22D41/54 ,  C04B35/013 ,  C04B35/043 ,  C04B35/0435 ,  C04B35/106 ,  C04B35/482 ,  C04B2235/3206 ,  C04B2235/3217 ,  C04B2235/3225 ,  C04B2235/3232 ,  C04B2235/3244 ,  C04B2235/34 ,  C04B2235/3409 ,  C04B2235/3418 ,  C04B2235/3821 ,  C04B2235/3826 ,  C04B2235/401 ,  C04B2235/402 ,  C04B2235/422 ,  C04B2235/425 ,  C04B2235/428 ,  C04B2235/5427 ,  C04B2235/5436 ,  C04B2235/5445 ,  C04B2235/5472 ,  C04B2235/72 ,  C04B2235/9607

Abstract: A refractory material contains: 40 mass % or more of MgO; 4 to 30 mass % of a free carbon component; and one or more of B2O3, P2O5, SiO2 and TiO2, in a total amount of 0.3 to 3 mass %, with the remainder being at least one other type of additional refractory component. A void layer exists in an interface between a carbon-containing matrix microstructure residing at least on opposite sides of a maximum-size one of a plurality of MgO-containing particles in the refractory material, and the maximum-size MgO-containing particle. A sum of respective thicknesses of the void layer at two positions on the opposite sides is 0.2 to 3.0% of a ratio with respect to particle size of the maximum-size MgO-containing particle. An inorganic compound of MgO and the one or more of B2O3, P2O5, SiO2 and TiO2 exists entirety or partially in a surface of each of the MgO-containing particles.

公开(公告)号：US09718128B2

公开(公告)日：2017-08-01

申请号：US14414208

申请日：2012-12-12

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Arito Mizobe ,  Kento Furukawa ,  Tetsuo Tsuduki ,  Masaki Yamamoto ,  Joji Kurisu

IPC: B22D41/50 ,  B22D41/08 ,  B22D41/58

CPC classification number: B22D41/50 ,  B22D41/08 ,  B22D41/58

Abstract: With a view to adding, to an upper nozzle formed with a bore having a shape capable of creating a less energy loss or smooth (constant) molten steel flow to suppress the occurrence of adhesion of inclusions and metals in molten steel, a gas injection function to thereby further suppress the occurrence of the adhesion, the present invention provides a method of using an upper nozzle configured to have a cross-sectional shape of a wall surface defining the bore, taken along an axis of the bore, comprising a curve represented by the following formula: log(r (z))=(1/n)×log((H+L)/(H+z))+log(r (L)) (n=1.5 to 6), where: L is a length of the upper nozzle; H is a calculational hydrostatic head height; and r (z) is an inner radius of the bore at a position downwardly away from an upper edge of the bore by a distance z. The method comprises using the upper nozzle in such a manner as to satisfy the following relationship: RG≦4.3×VL, where RG is a gas rate defined as a volume ratio of a flow rate QG (Nl/s) of injection gas to a flow rate QL (l/s) of molten steel flowing through the bore (RG=(QG/QL)×100(%)), and VL is a flow speed of the molten steel at a lower edge of the upper nozzle.

公开(公告)号：US20160297003A1

公开(公告)日：2016-10-13

申请号：US14777909

申请日：2014-03-19

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Katsumi MORIKAWA ,  Akinari SASAKI ,  Taro MAKINO ,  Ling LI

IPC: B22D41/54 ,  C04B35/01 ,  C04B35/043

CPC classification number: B22D41/54 ,  C04B35/013 ,  C04B35/043 ,  C04B35/0435 ,  C04B35/106 ,  C04B35/482 ,  C04B2235/3206 ,  C04B2235/3217 ,  C04B2235/3225 ,  C04B2235/3232 ,  C04B2235/3244 ,  C04B2235/34 ,  C04B2235/3409 ,  C04B2235/3418 ,  C04B2235/3821 ,  C04B2235/3826 ,  C04B2235/401 ,  C04B2235/402 ,  C04B2235/422 ,  C04B2235/425 ,  C04B2235/428 ,  C04B2235/5427 ,  C04B2235/5436 ,  C04B2235/5445 ,  C04B2235/5472 ,  C04B2235/72 ,  C04B2235/9607

Abstract: Provided is a refractory material having both excellent erosion/corrosion resistance and thermal shock resistance, which has hardly been obtainable by conventional techniques, and a casting nozzle using the refractory material. The refractory material of the present invention contains: MgO in an amount of 40 mass % or more; a free carbon component in an amount of 4 to 30 mass %; and one or more selected from the group consisting of B2O3, P2O5, SiO2 and TiO2, in a total amount of 0.3 to 3 mass %, with the remainder being at least one other type of additional refractory component, wherein a void layer exists in an interface between a carbon-containing matrix microstructure residing at least on opposite sides of a maximum-size one of a plurality of MgO-containing particles in the refractory material, and the maximum-size MgO-containing particle, wherein a sum of respective thicknesses of the void layer at two positions on the opposite sides is 0.2 to 3.0% in terms of a ratio with respect to a particle size of the maximum-size MgO-containing particle, and wherein an inorganic compound comprised of MgO and the one or more selected from the group consisting of B2O3, P2O5, SiO2 and TiO2 exists in an entirety or a part of a surface of each of the plurality of MgO-containing particles.

Abstract translation: 本发明提供耐腐蚀性，耐热冲击性优异的耐火材料，通过现有技术难以获得的耐火材料，以及使用该耐火材料的铸造用喷嘴。 本发明的耐火材料含有：40质量％以上的MgO， 4质量％以上的游离碳成分; 和选自B 2 O 3，P 2 O 5，SiO 2和TiO 2的一种或多种，​​总量为0.3〜3质量％，其余为至少一种其它类型的附加难熔成分，其中空隙层存在于 位于至少位于耐火材料中的多个含MgO颗粒中的最大尺寸的一个的相对侧上的含碳基体微结构和最大尺寸的含MgO颗粒之间的界面，其中， 在相对侧的两个位置的空隙层的比例相对于最大尺寸的含MgO颗粒的粒径的比率为0.2〜3.0％，其中由MgO组成的无机化合物和选自 从由B 2 O 3，P 2 O 5，SiO 2和TiO 2组成的组中，存在于多个含MgO颗粒中的每一个的整个或部分表面。

公开(公告)号：US20150196954A1

公开(公告)日：2015-07-16

申请号：US14414208

申请日：2012-12-12

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Arito Mizobe ,  Kento Furukawa ,  Tetsuo Tsuduki ,  Masaki Yamamoto ,  Joji Kurisu

IPC: B22D41/50 ,  B22D41/08

CPC classification number: B22D41/50 ,  B22D41/08 ,  B22D41/58

Abstract: With a view to adding, to an upper nozzle formed with a bore having a shape capable of creating a less energy loss or smooth (constant) molten steel flow to suppress the occurrence of adhesion of inclusions and metals in molten steel, a gas injection function to thereby further suppress the occurrence of the adhesion, the present invention provides a method of using an upper nozzle configured to have a cross-sectional shape of a wall surface defining the bore, taken along an axis of the bore, comprising a curve represented by the following formula: log(r (z))=(1/n)×log((H+L)/(H+z))+log(r (L)) (n=1.5 to 6), where: L is a length of the upper nozzle; H is a calculational hydrostatic head height; and r (z) is an inner radius of the bore at a position downwardly away from an upper edge of the bore by a distance z. The method comprises using the upper nozzle in such a manner as to satisfy the following relationship: RG≦4.3×VL, where RG is a gas rate defined as a volume ratio of a flow rate QG (Nl/s) of injection gas to a flow rate QL (l/s) of molten steel flowing through the bore (RG=(QG/QL)×100(%)), and VL is a flow speed of the molten steel at a lower edge of the upper nozzle.

Abstract translation: 为了向形成有具有能够产生较少能量损失或平滑（恒定）钢水流的形状的孔的上部喷嘴添加，以抑制钢水中夹杂物和金属粘附的发生，气体注入功能 从而进一步抑制粘附的发生，本发明提供了一种使用上部喷嘴的方法，所述上部喷嘴被构造成具有沿孔的轴线截取的限定孔的壁表面的横截面形状，包括由 log（r（z））=（1 / n）×log（（H + L）/（H + z））+ log（r（L））（n = 1.5〜6） L是上喷嘴的长度; H是计算静压头高度; 并且r（z）是在距离孔的上边缘向下远离距离z的位置处的孔的内半径。 该方法包括以满足以下关系式的方式使用上喷嘴：RG＆nlE; 4.3×VL，其中RG是气体速率，其定义为喷射气体的流量QG（Nl / s）的体积比 流过孔的钢水的流量QL（l / s）（RG =（QG / QL）×100（％）），VL是上喷嘴下边缘的钢水的流速。