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1. 发明专利

JP2001355014A METHOD FOR MELTING IRON-CONTAINING COLD MATERIAL 失效
公开(公告)号：JP2001355014A
公开(公告)日：2001-12-25
申请号：JP2000176925
申请日：2000-06-13
申请人： NIPPON STEEL CORP
发明人： KAMEI KOICHI , YAMAMOTO HIROAKI , KUMAZAWA HIROYUKI , TSUJI TAKASHI , ONUKI KAZUO
IPC分类号： C22B9/16 , C21B11/00 , C21C5/28 , C21C5/35
摘要： PROBLEM TO BE SOLVED: To provide a method for preventing the growth of material stuck to a top-blown lance in melting of an iron-containing cold material by using a converter. SOLUTION: In the melting method of the iron-containing cold material in molten iron continuously remaining system by using the converter having basic refractory structure in which the seed molten iron exists, basicity before tapping the molten iron is regulated to 1.1-1.4. The mixture of pulverized fine coal and lime powder containing 5-15 wt% pulverized fine coal as the whole or the main part is supplied by bottom blowing.

2. 发明专利

JPS6213406B2 失效
公开(公告)号：JPS6213406B2
公开(公告)日：1987-03-26
申请号：JP8959383
申请日：1983-05-21
申请人： NIPPON STEEL CORP
发明人： HIRAOKA TERUYOSHI , KASUYA YOSHUKI , NAGAO SHOJI , YAMAMOTO HIROAKI
IPC分类号： C21C5/28 , C21C5/36 , C22C33/04

3. 发明专利

JPS59215410A Method for refining high phosphorus steel in converter 失效
标题翻译：在转炉中精炼高磷钢的方法
公开(公告)号：JPS59215410A
公开(公告)日：1984-12-05
申请号：JP8959383
申请日：1983-05-21
申请人： Nippon Steel Corp
发明人： HIRAOKA TERUYOSHI , KASUYA YOSHIYUKI , NAGAO SHIYOUJI , YAMAMOTO HIROAKI
IPC分类号： C21C5/28 , C21C5/36 , C22C33/04 , C21C7/00
CPC分类号： C21C5/28
摘要： PURPOSE:To obtain high P steel at a low cost by adding a substance contg. carbon to a converter from an upper part in the last stage of blowing and by forcing P2O5 in slag to be reduced to increase the amount of P in steel. CONSTITUTION:When the decarburization efficiency of oxygen begins to decrease at a point CB after vigorous decarburization during refining in a converter by the top blowing of pure oxygen, the amount of FeO in slag is rapidly increased, and the oxidation of P and Mn is caused again, decreasing the amounts of P and Mn in molten iron. At this time powdery or lump substance contg. carbon such as lump coke is added to the slag from an upper part. P and Mn oxides are reduced, and P having a weak affinity for oxygen returns to steel.
摘要翻译：目的：通过添加物质来获得低成本的高P钢。碳从转炉的最后一段吹入转炉，并迫使渣中的P2O5还原，以增加钢中P的含量。构成：当通过顶吹纯氧在转炉精炼过程中，通过剧烈脱碳后的氧气脱碳效率开始下降，炉渣中FeO的量迅速增加，引起P和Mn的氧化再次降低铁水中的P和Mn的量。此时粉状或块状物质从上部向渣中加入诸如块状焦炭的碳。 P和Mn氧化物减少，对氧的亲和力弱的P返回到钢中。

4. 发明专利

JPH10147807A METHOD FOR MELTING IRON-CONTAINING COLD MATERIAL 失效
公开(公告)号：JPH10147807A
公开(公告)日：1998-06-02
申请号：JP30763196
申请日：1996-11-19
申请人： NIPPON STEEL CORP
发明人： ONUKI KAZUO , INUZUKA TAKAYUKI , YAMAMOTO HIROAKI , TSUJI TAKASHI , NAGAHAMA HIROSHI
IPC分类号： C21C5/28 , C21C5/36 , C21C5/56
摘要： PROBLEM TO BE SOLVED: To reduce consumption of protecting gas and non-oxidizing gas for cooling and the damaging velocity of furnace bottom refractory by specifying bottom-blown oxygen flow rate to top-blown total oxygen flow rate and the temp. of molten iron and the slag concn. in melting process and melting iron- containing cold material. SOLUTION: At the time of supplying and melting the iron-containing cold material into a converter incorporating molten iron, the bottom-blown oxygen flow rate is made 3-10% of the top-blown total flow rate to prevent the development of slopping. Further, the temp. of molten iron in the melting process is made to =3.5% to promote the reaction of iron oxide and manganese oxide in the slag. Further, the consumption of auxiliary raw material is controlled so that the slag composition in the melting process satisfies the inequality (CaO+MgO)/ SiO2 >=1.5. In the inequality, CaO, MgO and SiO2 are wt.% to each. By this method, even in the case of being

5. 发明专利

JPS60159105A METHOD FOR MELTING LOW-PHOSPHORUS STEEL IN FURNACE 失效
公开(公告)号：JPS60159105A
公开(公告)日：1985-08-20
申请号：JP1269784
申请日：1984-01-26
申请人： NIPPON STEEL CORP
发明人： KASUYA YOSHIYUKI , YAMAMOTO HIROAKI
IPC分类号： C21C5/28
摘要： PURPOSE:To melt easily and stably a low-phosphorus steel by performing slag control for the purpose of increasing the oxygen potential in slag in the end period of blowing in converter melting. CONSTITUTION:An oxygen-contg. solid material such as, for example, mill scale or the like in a granular or lump state is upward added to a molten steel so as to arrive at the slag layer and to increase the oxygen potential in the slag in the attenuating period of the decarburization reaction in the end period of blowing. Dephosphorization reaction is thus accelerated to obtain a low-phosphorus steel. Oxygen blowing is suspended in the midway of blowing if necessary and the slag contg. the phosphorus oxide is discharged to the outside of the furnace, then again the furnace is erected. An auxiliary raw material of CaO and the above- mentioned oxygen-contg. solid material are added to the furnace inside to manufacture slag having high oxygen potential in the end period of blowing. The blowing is continued to accelerate the dephosphorization reaction. The amt. of the phosphorus in the molten steel is further reduced by the above-mentioned method.

6. 发明专利

JPH10147808A METHOD FOR MELTING IRON-CONTAINING COLD MATERIAL 失效
公开(公告)号：JPH10147808A
公开(公告)日：1998-06-02
申请号：JP30763296
申请日：1996-11-19
申请人： NIPPON STEEL CORP
发明人： ONUKI KAZUO , INUZUKA TAKAYUKI , YAMAMOTO HIROAKI , TSUJI TAKASHI , AOKI RIICHI
IPC分类号： C21C5/28 , C21C5/36 , C21C5/44
摘要： PROBLEM TO BE SOLVED: To provide a melting method capable of drastically reducing the wear at the furnace bottom and a furnace wall refractory, at the time of melting the supplied iron-containing cold material in a converter having a top-blown lance and a bottom-blown tuyere, in which the molten seed metal exists. SOLUTION: The temp. of molten iron in the melting process is held at

7. 发明专利

JPH0320404A METHOD FOR PROTECTING IRON SHELL AT BOTTOM PART IN VACUUM DEGASSING APPARATUS 失效
公开(公告)号：JPH0320404A
公开(公告)日：1991-01-29
申请号：JP15634289
申请日：1989-06-19
申请人： NIPPON STEEL CORP
发明人： YAMAMOTO HIROAKI , HIZUKA NAOHISA , HASEGAWA KENJI
IPC分类号： C21C7/10
摘要： PURPOSE:To prevent red heat deformation for iron shell at bottom part in the apparatus by adding both of CaCO3 and MgO to molten slag layer before or during treating of vacuum degassing, cooling and solidifying the slag layer and reducing radiation heat from the slag layer. CONSTITUTION:At one or both of timings before and/or during treating, in executing the vacuum degassing treatment to molten steel in a ladle, both of CaCO3 and MgO are added to the molten slag layer. The CaCO3 gives cooling action to the slag layer in the ladle with decomposition endothermic reaction of the lime stone and stirring caused by CO2 gas at the time of decomposing the lime stone. The MgO changes the slag composition and raises m.p. of the slag. The slag layer is cooled and solidified with these actions and the radiation heat from the slag layer is reduced. In this result, protection of heat to the iron shell at the bottom part in the vacuum degassing apparatus is executed, and trouble of red heat deformation for the iron shell at the bottom part is reduced.

8. 发明专利

JP2001335822A METHOD FOR MELTING IRON-CONTAINED COLD MATERIAL 失效
公开(公告)号：JP2001335822A
公开(公告)日：2001-12-04
申请号：JP2000154105
申请日：2000-05-25
申请人： NIPPON STEEL CORP
发明人： ONUKI KAZUO , SAWAI TAKASHI , TAKEDA YASUO , YAMAMOTO HIROAKI , AOKI RIICHI , KUMAZAWA HIROYUKI , TSUJI TAKASHI , MANABE TADASHI
IPC分类号： C22B5/04 , C21C5/28 , C22B5/10
摘要： PROBLEM TO BE SOLVED: To provide a continuously remaining molten iron and slag type melting method for iron-contained cold material with which even in the case of using an inexpensive raw fuel having high sulfur content for reducing the production cost of high carbon molten iron, the high carbon molten iron having >=3.7% carbon concentration can be obtained without lowering the iron yield. SOLUTION: In the continuously remaining molten iron and slag type melting method for the iron-contained cold material, as the raw fuel, the cheap raw fuel having such a high sulfur content as >=0.9 kg/t S input unit in the raw material is used, and the desulfurizing treatment in a furnace, is performed to the whole high carbon molten iron obtained by carburization-melting the iron cold material before tapping or after tapping or to a part of the left high carbon molten iron to lower the sulfur concentration in the seed molten iron into =3.7%.

9. 发明专利

JPH02263910A METHOD FOR TREATING REMAINING MOLTEN METAL IN CONVERTER 失效
公开(公告)号：JPH02263910A
公开(公告)日：1990-10-26
申请号：JP8553989
申请日：1989-04-04
申请人： NIPPON STEEL CORP
发明人： YAMAMOTO HIROAKI , KOMATSU MICHIO , SANUKI MINORU
IPC分类号： C21C5/46
摘要： PURPOSE:To improve the yield of molten steel and to stabilize the operation at the next heat by tilting a converter, making upright state after discharging only a part of slag, shaking the furnace after adding coolant and discharging the whole remaining slag from a steel tapping hole after executing blow coating of the slag. CONSTITUTION:After tapping the molten steel from the converter 1, the furnace 1 is tilted toward slag-off side 4, and a part of the slag 7 is discharged without discharging the molten steel 5 and successively, the furnace 1 is made to the upright state, and after adding the coolant of lime stone, etc., into the furnace 1, the furnace 1 is shaked to sufficiently mix the molten steel 5, slag 7 and coolant. The slag 7 having good fluidity is adjusted into the slag 7 adequate to the below coating at the next process in the characteristic, and also by using the difference of solidifying point between the slag 7 and the molten steel 5, the molten steel 5 is solidified to make solidified material 6 of the molten steel 5 separated from the slag 7. By again tilting the furnace 1 toward the slag-off side 4, after executing the slag coating of the above slag 7 to the side wall with the blow coating device 9, the furnace 1 is tilted to the steel tapping side 3, and the remaining slag 7 is discharged from the steel tapping hole 2 under condition of remaining the above solidified material 6 in the furnace 1.

10. 发明专利

JPS6235445B2 失效
公开(公告)号：JPS6235445B2
公开(公告)日：1987-08-01
申请号：JP11649383
申请日：1983-06-28
申请人： NIPPON STEEL CORP
发明人： HIRAOKA TERUYOSHI , KASUYA YOSHUKI , ICHIKAWA KAORU , YAMAMOTO HIROAKI
IPC分类号： C21C5/28 , C21C5/32 , C21C5/36

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