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1. 发明专利

JPH05200535A INSTRUMENT FOR TESTING NOZZLE REFRACTORY FOR MOLTEN METAL 失效
公开(公告)号：JPH05200535A
公开(公告)日：1993-08-10
申请号：JP3720792
申请日：1992-01-28
申请人： NISSHIN STEEL CO LTD , RIYOOSEN ENGINEERS KK
发明人： HIRAGA YUTAKA , TANIE MASAFUNE
IPC分类号： B22D11/10 , B22D41/50 , G01N33/38
摘要： PURPOSE:To execute a performance test of a nozzle refractory for molten metal by making a testing environment based on the actual process of continuous casting, etc. CONSTITUTION:The nozzle 20 for uptake and the nozzle 70 for down-take are fitted as the nozzle refractory for performance test to a vacuum vessel 10 connected with an evacuating device 50 through a gas exhaust pipe 51. In the inner part of the nozzle 20 for uptake, a gas blowing pipe 60 is opened. Further, an auxiliary vessel 80, leak valve, etc., can be arranged between the vacuum vessel 10 and the evacuating device 50. Lifting action by circulating gas blown from the gas blowing pipe 60 is added to the molten metal 40 sucked from a molten metal vessel 30 by reducing the pressure in the vacuum vessel 10, and the molten metal is flowed in the unidirection along the circulating flow passage of the molten metal vessel 30 the nozzle 20 for uptake the vacuum vessel 10 the nozzle 70 for downtake the molten metal vessel 30. In this result, clogging phenomenon of an immersion nozzle, etc., sticking phenomenon of inclusions into the inner surface of the nozzle, eroding phenomenon of the nozzle, etc., can be simply reproduced in high accuracy.

2. 发明专利

JP2013253290A OPERATION METHOD OF CONVERTER 审中-公开
公开(公告)号：JP2013253290A
公开(公告)日：2013-12-19
申请号：JP2012129418
申请日：2012-06-07
申请人： NISSHIN STEEL CO LTD
发明人： UMAE TADAICHI , HIRAGA YUTAKA
IPC分类号： C21C5/28
摘要： PROBLEM TO BE SOLVED: To provide an operation method of a converter, whereby occurrence of slopping can be reduced without using any additional auxiliary materials or modifying equipment.SOLUTION: An operation method of a converter comprises: introducing molten iron into the converter; subsequently performing blowing; and, after blowing is started, charging an iron oxide source and a CaO source comprising limestone and quicklime. Here, a portion of the iron oxide source is separately charged after slopping is completed so as to reduce the amount of the iron oxide source charged before the occurrence of slopping, and the amounts of limestone and quicklime in the CaO source are adjusted so that their amounts calculated in terms of CaO are kept constant and that cooling power can be increased, thereby reducing the iron oxide source charged with the CaO reduction by the amount corresponding to the increase of the cooling power.

3. 发明专利

JPH10219334A DECOPPERIZING AND DETINNING METHOD FROM MOLTEN STEEL 失效
公开(公告)号：JPH10219334A
公开(公告)日：1998-08-18
申请号：JP2705197
申请日：1997-02-10
申请人： NISSHIN STEEL CO LTD
发明人： HIRAGA YUTAKA
IPC分类号： C21C7/00 , C21C7/10
摘要： PROBLEM TO BE SOLVED: To increase an evaporation rate and to rapidly decopperize and detin molten steel by blowing a hydrogen-contg. gas to the surface of the molten steel at the time of incorporating oxygen into the molten metal of iron scrap contg. copper and tin as impurities and evaporating away copper and tin as suboxide. SOLUTION: At the time of reutilizing the iron scrap contg. the copper and tin as the impurities respectively at >=0.05wt.%, the oxygen quantity in the melt of the iron scrap is so prepd. as to attain >=1000ppm and the molten steel is vacuum treated under a vacuum degree of /min per 1 ton molten steel to generate steam and to put the molten steel into a boiling state, thereby increasing the surface area of the molten steel and increasing the evaporation rate of the suboxide of the copper and tin, by which the copper and tin are rapidly evaporated away from the molten steel.

4. 发明专利

JPH06240327A PRODUCTION OF LOW SI-LOW S-HIGH MN MOLTEN IRON ACCOMPANIED WITH SMELTING REDUCTION OF MN ORE 失效
公开(公告)号：JPH06240327A
公开(公告)日：1994-08-30
申请号：JP5004993
申请日：1993-02-16
申请人： NISSHIN STEEL CO LTD
发明人： HIRAGA YUTAKA , YAMAMOTO ATSUO , YOSHIOKA KAZUYA , NAKAJIMA YOSHIO
IPC分类号： C21C1/02 , C21C1/04
摘要： PURPOSE:To obtain a low Si.low S.high Mn molten iron by executing smelting reduction to a Mn ore, increasing Mn concn. in the molten iron and progressing desiliconizing and desulfurizing reactions at the same time. CONSTITUTION:Into the high Si molten iron tapped from a blast furnace, lime is added at 4-10kg/ton of molten iron in a unit requirement from the upper part. Further, the mixed material of the lime and powdery Mn ore so as to be 2.5-4.0 basicity including the lime is blown into the molten metal together with carbonaceous material, and the smelting reduction of the Mn ore with Si in the molten iron is progressed at the same time of the desulfurizing treatment. The mixed material of the lime and the powdery Mn ore, and the carbonaceous material are blown by using a lance for blowing immersed into the molten iron from the upper part and/or a nozzle for blowing arranged at the bottom part or the side wall of a vessel. To the reduction of Mn ore, Si in the molten iron is used and the Mn concn. in the molten iron can be increased without using expensive ferro-manganese. Further, desiliconizing and desulfurizing reactions are also quickly progressed.

5. 发明专利

JPH05239510A 失效
公开(公告)号：JPH05239510A
公开(公告)日：1993-09-17
申请号：JP7817892
申请日：1992-02-28
申请人： NISSHIN STEEL CO LTD
发明人： HIRAGA YUTAKA , YAMAMOTO ATSUO , GENNAI KIYOTAKA , YOSHIOKA KAZUYA
IPC分类号： C21B3/00
摘要： PURPOSE:To execute preliminary refining of deisliconizing, dephosphorizing and desulfurizing for a molten iron by blowing pulverized iron ore, quick lime as a slag forming agent and pulverized carbon, as required, into the molten iron. CONSTITUTION:Pulverized oxide iron ore and pulverized quick lime as a slag forming agent are blow into the molten iron produced from blast furnace. The oxidizing power of Fe2O3 in the iron ore desiliconizes Si in the molten iron into SiO2, and together with the added quick lime forms a high basic slag with >=1.5 basicity (CaO/SiO). Also, P in the molten iron is oxidized into P2O5 by the Fe2O3 in the iron ore to be stably fixed in CaO in the high basic slag. The residue of Fe2O3 in the iron ore is reduced into Fe by the saturated carbon in the molten iron to increase molten iron quantity. By promoting the reduction of iron ore with simultaneously adding pulverized carbon as required and facilitating the removal of S in the molten iron to make the basicity at reduction below 3.0 by reducing the content of Fe2O3 in the molten slag, the molten iron of a lower content of Si P and S can be produced.

6. 发明专利

JPH03243258A NOZZLE FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH03243258A
公开(公告)日：1991-10-30
申请号：JP3719890
申请日：1990-02-20
申请人： NISSHIN STEEL CO LTD
发明人： HIRAGA YUTAKA , YASHIMA YUKIO , NAKAJIMA YOSHIO
IPC分类号： B22D11/10 , B22D41/54 , C04B35/04 , C04B35/043 , C04B35/10 , C04B35/101 , C04B35/48
摘要： PURPOSE:To enable stable continuous casting operation by inserting the specific composition of cylindrical sleeve into inner hole of a submerged nozzle. CONSTITUTION:Into one side or both sides of inner faces of the submerged nozzle 3 for continuously pouring molten steel in a tundish into a mold 1 and an intermediate nozzle connected with upper part of this nozzle 1, the cylindrical sleeve 10 constituted with the following refractory material is inserted. This is constituted with the refractory material combining one or more kinds of a: carbonless high alumina refractory containing 90wt.% Al2O3, b: carbonless high magnesia refractory containing 90wt.% MgO and c: carbonless high zirconia refractory 90wt.% ZrO2.

7. 发明专利

JP2014210942A 鉄資源の再生処理方法有权
标题翻译：铁矿资源再生方法
公开(公告)号：JP2014210942A
公开(公告)日：2014-11-13
申请号：JP2013086251
申请日：2013-04-17
申请人：日新製鋼株式会社 , Nisshin Steel Co Ltd
发明人： TAKEDA KIMIYOSHI , HIRAGA YUTAKA , DANJIYOU TAKAYOSHI
IPC分类号： C22B1/248 , B09B3/00
CPC分类号： B09B3/00 , C22B1/24
摘要：【課題】十分な強度のペレット又はブリケットを得ることができる鉄資源の再生処理方法を提供する。【解決手段】酸化鉄が主成分であって油分及び水分を含有する含油含水スケールに生石灰を混合して第一生成物を生成する第一混合工程100と、第一生成物にバインダーを混合して第二生成物を生成する第二混合工程200と、第二生成物を加圧してペレット又はブリケットに製団加工する製団工程300を備える鉄資源の再生処理方法であって、生石灰の粒度が1mm以下であり、しかも第二混合工程200において、油分を含有しないスケールをバインダーとともに混合する。【選択図】図1
摘要翻译：要解决的问题：提供一种能够获得具有足够强度的颗粒或团块的铁资源再生方法。解决方案：一种铁资源再生方法，包括：将生石灰与含铁的含铁水垢混合的第一混合步骤100 氧化物作为主要成分并且还含有油和水以产生第一产物; 将粘合剂与第一产品混合以产生第二产品的第二混合步骤200; 以及压块步骤300，其将第二产品加压以将其压块成颗粒或团块。生石灰的粒径为1mm以下。此外，在第二混合步骤200中，不含油的标尺与粘合剂混合在一起。

8. 发明专利

JP2013253289A EVALUATION METHOD OF SLOPPING 审中-公开
公开(公告)号：JP2013253289A
公开(公告)日：2013-12-19
申请号：JP2012129417
申请日：2012-06-07
申请人： NISSHIN STEEL CO LTD
发明人： UMAE TADAICHI , HIRAGA YUTAKA
IPC分类号： C21C5/28
摘要： PROBLEM TO BE SOLVED: To provide an evaluation method which can determine presence or absence of slopping or scale of slopping during converter blowing without depending on visual observation of an operator.SOLUTION: An evaluation method of slopping comprises the steps of: defining a point located in an outflow region of slag overflowing from a converter as a measuring point (a) and measuring temperature at the measuring point (a); and determining a slopping index SLI represented by &Sgr;td wherein td is the difference between the temperature ti measured at the measuring point (a) when slopping occurs and the temperature tc measured before the occurrence of slopping and evaluating the degree of slopping based on the SLI value.

9. 发明专利

JPH111718A DECOPPERING AND DETINNING METHOD FROM MOLTEN STEEL 失效
公开(公告)号：JPH111718A
公开(公告)日：1999-01-06
申请号：JP14914597
申请日：1997-06-06
申请人： NISSHIN STEEL CO LTD
发明人： HIRAGA YUTAKA
IPC分类号： C21C7/00
摘要： PROBLEM TO BE SOLVED: To rapidly remove copper and tin from a molten steel by blowing the specified grain size range of powdered coal material against the surface of the molten steel from the upper side with a carrier gas while executing a vacuum treatment after regulating the quantity of oxygen in the molten steel. SOLUTION: The increase of an evaporative reaction boundary area is advantageous in order to increase the evaporating speed of copper and tin in the molten steel. For this purpose, the powdered coal material of 10-100 μm in grain size is blown against the surface of the molten steel from the upper side with the gas to form a suboxide, the reaction between oxygen and carbon existing in supersaturation on the surface is made to progress in parallel together with the evaporating reaction. By this way, the surface of the molten steel becomes a disturbing state with the generation of a large quantity of CO gas and the evaporative reaction boundary area of the suboxide is increased. The blowing quantity of powdered coal material is specified to be 0.1-5.0 kg/min per wt. ton of the molten steel. Also, the blowing carrier gas is specified to be nitrogen or argon and the quantity of the gas is preferably 0.1-1.0 Nm /min a wt. ton of the molten steel.

10. 发明专利

JPH10152713A METHOD FOR DEPHOSPHORIZING AND DESULFURIZING MOLTEN IRON 失效
公开(公告)号：JPH10152713A
公开(公告)日：1998-06-09
申请号：JP32485596
申请日：1996-11-21
申请人： NISSHIN STEEL CO LTD
发明人： TATEYAMA MASAYUKI , GENNAI KIYOTAKA , HIRAGA YUTAKA , OKIMURA TOSHIAKI
IPC分类号： C21C1/02
摘要： PROBLEM TO BE SOLVED: To efficiently realize the desulfurization of molten iron to low concn. range without needing long time to the dephosphori-zation by continuously feeding a linear solid desulfurizing agent containing metallic Mg in its axial direction from the bath surface into the bath at a prescribed speed while injecting dephos-phorizing agent into the molten iron. SOLUTION: The desulfurization and the dephosphorization are simultaneously treated to the molten iron 2 in a vessel 1. While injecting the dephosphorizing agent into the molten iron 2 by using an immersion lance 3, simultaneously, the linear solid de-sulfurizing wire agent 4 containing the metallic Mg is continuously fed from the bath surface into the bath at the prescribed speed. The immersion lance 3 is provided with a blowing hole 5 at the top part of a tubular body protected with a refractory. The injection of the dephosphorizing agent is executed by carrying the powdery dephosphorizing agent 6 with carrier gas 7. By this method, the desulfurization and the dephosphorization can efficiently and simultaneously be executed in good operatability.

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