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1. 发明专利

DE69725316D1 未知
公开(公告)号：DE69725316D1
公开(公告)日：2003-11-06
申请号：DE69725316
申请日：1997-12-25
申请人： NIPPON STEEL CORP
发明人： SHIMOMURA KENSUKE , SADACHIKA MASARU , TAKANO HIRONORI , OGAWA GAKU , ABE KENJI , OKIMORI MAYUMI , MAKINO NOBUYUKI , IWASAKI HIROSHI , TANAKA TOMOAKI , MORISHIGE HIROAKI
IPC分类号： C21C5/28 , C21C7/10 , C22B9/04
摘要： (Problem) To conduct dust collection in vacuum/reduced pressure refining treatment, using a low cost filter without causing the filter to damage, burn, etc. (Solving Means) Vacuum/reduced pressure refining vessel 1 is connected to dry type dust collector 3 using filter 2 by upstream duct 5, and dry type duct collector 3 is connected to reduced pressure evacuating apparatus 4 by downstream duct 6 and block valve 7 is provided in upstream duct 5. At the start of vacuum/reduced pressure refining treatment, a non-oxidizing gas is injected into the upstream duct upstream of block valve 7 to substantially replace the oxygen in the upstream duct and then hermetically close the upstream duct. After the hermetically closed state has been established in the upstream duct, block valve 7 is opened and dust collector 3 is started to operate. At the end of vacuum/reduced pressure refining treatment, block valve 7 is closed and only the non-oxidizing gas is injected into the upstream duct to return the pressure and then the upstream duct is made open to the atmospheric air, and preferably an open port siding with dust collector 3 is closed in a waiting period from the end of vacuum/reduced pressure refining treatment to the start of next vacuum/reduced pressure refining treatment.

2. 发明专利

DE69725316T2 未知
公开(公告)号：DE69725316T2
公开(公告)日：2004-07-22
申请号：DE69725316
申请日：1997-12-25
申请人： NIPPON STEEL CORP
发明人： SHIMOMURA KENSUKE , SADACHIKA MASARU , TAKANO HIRONORI , OGAWA GAKU , ABE KENJI , OKIMORI MAYUMI , MAKINO NOBUYUKI , IWASAKI HIROSHI , TANAKA TOMOAKI , MORISHIGE HIROAKI
IPC分类号： C21C5/28 , C21C7/10 , C22B9/04
摘要： (Problem) To conduct dust collection in vacuum/reduced pressure refining treatment, using a low cost filter without causing the filter to damage, burn, etc. (Solving Means) Vacuum/reduced pressure refining vessel 1 is connected to dry type dust collector 3 using filter 2 by upstream duct 5, and dry type duct collector 3 is connected to reduced pressure evacuating apparatus 4 by downstream duct 6 and block valve 7 is provided in upstream duct 5. At the start of vacuum/reduced pressure refining treatment, a non-oxidizing gas is injected into the upstream duct upstream of block valve 7 to substantially replace the oxygen in the upstream duct and then hermetically close the upstream duct. After the hermetically closed state has been established in the upstream duct, block valve 7 is opened and dust collector 3 is started to operate. At the end of vacuum/reduced pressure refining treatment, block valve 7 is closed and only the non-oxidizing gas is injected into the upstream duct to return the pressure and then the upstream duct is made open to the atmospheric air, and preferably an open port siding with dust collector 3 is closed in a waiting period from the end of vacuum/reduced pressure refining treatment to the start of next vacuum/reduced pressure refining treatment.

3. 发明公开

EP0913487A4 METHOD FOR VACUUM/REDUCED-PRESSURE REFINING AND FACILITY FOR VACUUM/REDUCED-PRESSURE REFINING 失效
标题翻译： VERFAHREN UND EINRICHTUNG ZUR VAKUUM / UNTERDRUCKRAPHATION
公开(公告)号：EP0913487A4
公开(公告)日：2000-03-01
申请号：EP97949234
申请日：1997-12-25
申请人： NIPPON STEEL CORP
发明人： SHIMOMURA KENSUKE , SADACHIKA MASARU , TAKANO HIRONORI , OGAWA GAKU , ABE KENJI , OKIMORI MAYUMI , MAKINO NOBUYUKI , IWASAKI HIROSHI , TANAKA TOMOAKI , MORISHIGE HIROAKI
IPC分类号： C21C5/28 , C21C7/10 , C22B9/04
CPC分类号： C21C7/10 , C21C5/28
摘要： Problem: dust collection in a vacuum/reduced-pressure refining process is conducted using an inexpensive filter without causing damage on and burn of the filter. Solving means: a vacuum/reduced-pressure refining vessel (1), a dry type dust collector (3) using a filter (2) and a reduced-pressure exhaust device (4) are connected sequentially by an upstream-side duct (5) and a downstream-side duct (6), and a gate valve (7) is provided to the upstream-side duct (5). At the time of starting the vaccum/reduced-pressure refining process, non-oxidizing gas is fed into the upstream side of the gate valve (7) and oxygen on the upstream side is replaced thereby substantially. Thereafter, the upstream side is closed gastightly, the gate valve (7) is opened after the closed state on the upstream side is accomplished, and the dust collector (3) is operated. It is preferable that after the vacuum/reduced-pressure refining process the gate valve (7) is closed, only the non-oxidizing gas is fed into the upstream side of the valve to recover the pressure, and then the vessel is opened to the atmosphere, and it is also preferable that after the vacuum/reduced-pressure refining process, an opening part on the duct collector (3) side is closed during the standby till the subsequent vacuum/reduced-pressure refining process is started.
摘要翻译：（问题）在真空/减压精炼处理中进行集尘，使用低成本的过滤器而不会导致过滤器损坏，燃烧等（解决方案）真空/减压精炼容器1连接到干式集尘器3 通过上游管道5使用过滤器2，干式管道收集器3通过下游管道6连接到减压排出装置4，并且在上游管道5中设置截止阀7.在真空/减压精炼处理开始时，将氧化气体注入到截止阀7上游的上游管道中，以基本上更换上游管道中的氧气，然后气密地关闭上游管道。在上游管道中建立了气密关闭状态之后，打开截止阀7，开始集尘器3的运转。在真空/减压精炼处理结束时，截止阀7关闭，只有非氧化性气体被注入上游管道以返回压力，然后使上游管道对大气敞开，优选地是开放的在从真空/减压精炼处理结束到下一次真空/减压精炼处理开始的等待期间，带有集尘器3的端口壁关闭。

4. 发明专利

JP2001181728A TREATING METHOD FOR INSOLUBILIZING CHROMIUM OXIDE IN DUST AND SLUDGE DEVELOPED DURING MANUFACTURE OF CHROMIUM- CONTAINING STEEL 失效
公开(公告)号：JP2001181728A
公开(公告)日：2001-07-03
申请号：JP36301999
申请日：1999-12-21
申请人： NIPPON STEEL CORP
发明人： NAKAO RYUJI , MORISHIGE HIROAKI , MATSUNAMI TADANORI
IPC分类号： C21C5/36 , C21C7/00 , C21C7/076
摘要： PROBLEM TO BE SOLVED: To make the insolubility of chromium oxide contained in dust and sludge. SOLUTION: After drying the dust and sludge, they are added into a furnace carrying out the melting and refining of the chromium-containing steel to form a molten slag, and successively, when the slag is separated and removed from the molten steel surface, a desulfurizing partition ratio (S)/[S] between the molten steel and the slag, is adjusted so as to satisfy the formula, log(S)/[S]>=0.08[-614/T+0.531[C]+0.413[Si]+0.616(T.CaO)/(SiO2)-0.047(Al2 O3)+0.0176(MgO)+0.0264(CaF2)+0.172] (wherein, T is the molten steel temperature ( deg.C); [C] is C concentration in the molten steel (mass %, the same shall apply hereinafter); [Si] is Si concentration in the molten steel; (T.CaO) is the conversion concentration of Ca in (CaO) and Ca in CaF2 in the slag into the CaO; (SiO2) is SiO2 concentration in the slag; (Al2O3) is Al2O3 concentration in the slag; (MgO) is MgO concentration in the slag; and (CaF2) is CaF2 concentration in the slag).

5. 发明专利

JPH0873924A METHOD FOR REFINING CHROMIUM-CONTAINING MOLTEN STEEL 失效
公开(公告)号：JPH0873924A
公开(公告)日：1996-03-19
申请号：JP21026294
申请日：1994-09-02
申请人： NIPPON STEEL CORP
发明人： NAKAO RYUJI , OKIMORI MAYUMI , IWASAKI HIROSHI , MORISHIGE HIROAKI
IPC分类号： C21C7/068 , C21C7/10
摘要： PURPOSE: To suppress the oxidation of the chromium in molten steel, to efficient ly execute decarburization at a high speed and to reduce the cost of a refining gas. CONSTITUTION: The molten steel is subjected to a decarburization treatment in a refining vessel 1 by supplying gaseous oxygen or a gaseous mixture composed of >=2 gases selected from this gaseous oxygen, an inert gas and air as a blowing gas into this vessel under the amt. pressure until the concn. [C] of the molten steels falls down to =2 kinds of the gases selected from the gaseous oxygen, the inert gas and the air as the blowing gas when the concn. [C] is >=0.05mass% and by supplying only the inert gas when the concn. [C] is below 0.05mass%. As a result, the decarburization rate is improved at the same amt. of the oxygen to be supplied and the consumption unit of the Si for reduction after the decarburization is decreased. Since the use of the inexpensive air is made possible, the refining cost is remarkably reduced.

6. 发明专利

JPH04333511A METHOD FOR DECARBONIZED-REFINING CHROMIUM-CONTAINING MOLTEN STEEL 失效
公开(公告)号：JPH04333511A
公开(公告)日：1992-11-20
申请号：JP5459291
申请日：1991-03-19
申请人： NIPPON STEEL CORP
发明人： NAKAO RYUJI , TANAKA SHIGENORI , MORISHIGE HIROAKI , TAKANO HIRONORI , TSUJINO RYOJI , HIRATA HIROSHI
IPC分类号： C21C7/00 , C21C7/068
摘要： PURPOSE:To restrain oxidization of chromium in molten steel and to efficiently execute decarbonization by keeping slag condition to the effective specific condition in decarbonized-refining to the chromium-containing molten steel having the specific carbon content. CONSTITUTION:In the decarbonized-refining to the chromium-containing molten steel having >=0.3% carbon, this refining is executed under condition of satisfying the inequalities I and II and the equation III to the slag condition. Wherein, (%MgO), (%Al2O3) and (%SiO2):(MgO), (Al2O3) and (SiO2) concns (wt.%) in the slag at the starting time of decarbonizing, [%Si] [Si] concn in the molten steel at the starting time of decarbonizing, WS: slag quantity (kg/T) per unit wt. of the molten steel existing at the starting time of decarbonizing, WCr2O3:Cr2 O3 quantity (kg/T) produced during decarbonizing, WF: added flux index (kg/T), WCaF2, WAl2O3, WSiO2, and WCaO: adding quantity of each flux of CaF2, Al2O3, SiO2 and CaO (kg/T) per unit wt. of the molten steel.

7. 发明专利

JPS59104420A Method for decarburizing chromium-containing molten steel 失效
标题翻译：用于脱铬含铬钢的方法
公开(公告)号：JPS59104420A
公开(公告)日：1984-06-16
申请号：JP21207582
申请日：1982-12-04
申请人： Nippon Steel Corp
发明人： IKEHARA YASUMASA , ARIYOSHI HARUKI , MORISHIGE HIROAKI
IPC分类号： C21C7/00 , C21C7/068 , C21C7/072
CPC分类号： C21C7/0685
摘要： PURPOSE:To make it possible to utilize an inexpensive small piece cooling material having good shape and to exclude a defect due to the interruption of decarburization while reduce the amount to be required of O2-gas, in a decarburizing stage for blowing O2-gas and dilution gas into molten steel, by adding metal oxide after the intermediate period during carburization. CONSTITUTION:For example, in performing decarburization by an AOD process for simultaneously blowing Ar as dilution gas and O2-gas into molten steel, metal oxide, for example, a chromium ore, NiO, scale or an iron ore is added after the intermediate period of decarburization. Herein, the intermediate period during decarburization means a stage wherein C in molten steel reaches about 0.25% or less. By this method, metal oxide is reduced by Cr in the molten steel and it is supported that the formed Cr2O3 in the molten steel is reacted with C in the molten steel and contributes to decarburization. Because the oxygen concn. (Cr2O3 concn.) in the molten steel is kept high by thus added metal oxide, decarburization can be performed at the same speed as a conventional process by stirring without blowing O2-gas but only with blowing dilution gas.
摘要翻译：目的：为了能够利用具有良好形状的便宜的小件冷却材料，并且在减少O2气体所需的量的同时减少由于脱碳中断而导致的缺陷，在用于吹入O 2气体的脱碳阶段和稀释气体进入钢水，通过在渗碳过程中间期后加入金属氧化物。构成：例如，在通过AOD法进行脱碳的同时，将Ar作为稀释气体和O 2气体同时吹入钢水中，在中间期之后添加金属氧化物，例如铬矿石，NiO，氧化皮，铁矿石脱碳。这里，脱碳期间是指钢水中的C达到约0.25％以下的阶段。通过这种方法，在钢水中金属氧化物被Cr还原，并且支撑钢水中形成的Cr 2 O 3在钢水中与C反应并有助于脱碳。因为氧气浓度（Cr 2 O 3浓度）通过这样添加的金属氧化物保持较高，通过搅拌而不用吹入O 2气体，但是仅用吹入的稀释气体，可以以与常规方法相同的速度进行脱碳。

8. 发明专利

JPH10183231A VACUUM-REDUCED PRESSURE REFINING METHOD AND VACUUM-REDUCED PRESSURE REFINING EQUIPMENT 失效
公开(公告)号：JPH10183231A
公开(公告)日：1998-07-14
申请号：JP35588896
申请日：1996-12-25
申请人： NIPPON STEEL CORP
发明人： SHIMOMURA KENSUKE , SADACHIKA MASARU , MORISHIGE HIROAKI , OGAWA TAKESHI
IPC分类号： C21C7/10
摘要： PROBLEM TO BE SOLVED: To execute the dust collection in vacuum-reduced pressure refining treatment by using a filter at a low cost without causing damage and burning, etc., of the filter. SOLUTION: A vacuum reduced pressure refining vessel 1, a drytype dust collector 3 using the filter 2 and a reduced pressure exhauster 4 are connected with an upstream side duct 5 and a downstream side duct 6, in order, and a gate valve 7 is arranged in the upstream side duct 5. At the time of starting the vacuum reduced pressure refining treatment, non-oxidizing gas is flowed at the upstream side from the gate valve 7, and after substantially replacing oxygen at the upstream side, the upstream side is closed, and after completing the closed condition at the upstream side, the gate valve 7 is opened and the dust collector 3 is worked. At the time of finishing the vacuum reduced pressure refining treatment, the gate valve 7 is closed and it is desirable to open to the atmosphere after receiving the pressure by flowing only the non-oxidizing gas into the upstream side, and further, to close the opening hole part at the dust collector 3 side at the time of waiting till starting the following vacuum reduced pressure refining treatment after finishing the vacuum reduced pressure refining treatment.

9. 发明专利

JPH0885815A METHOD FOR EFFECTIVELY REFINING MOLTEN CHROMIUM-CONTAINING STEEL USING DECARBURIZED SLAG 失效
公开(公告)号：JPH0885815A
公开(公告)日：1996-04-02
申请号：JP22223094
申请日：1994-09-16
申请人： NIPPON STEEL CORP
发明人： NAKAO RYUJI , OKIMORI MAYUMI , IWASAKI HIROSHI , MORISHIGE HIROAKI
IPC分类号： C21C7/00 , C21C5/28 , C21C7/068
摘要： PURPOSE: To reduce and recover produced chromium oxide in a method at a low cost in a decarburization-refining of molten chromium-containing steel and also, to effectively execute the reduction and the decarburization. CONSTITUTION: At the time of tapping the decarburization-refined molten steel in the decarburization-refining of the molten chromium-containing steel, the crude molten steel having >=1400 deg.C, >=0.2mass% [Si] concn. and >=1.2mass% [C] concn., is received under the condition of remaining slag containing 15-50mass% chromium oxide produced by the decarburization-refining in a furnace. In the case of being >=0.1mass% [Si] concn. in the crude molten steel, only inert gas is supplied from a bottom-blowing tuyere, and in the case of being

10. 发明专利

JPH0885811A METHOD FOR REFINING MOLTEN CHROMIUM-CONTAINING STEEL 失效
公开(公告)号：JPH0885811A
公开(公告)日：1996-04-02
申请号：JP22538194
申请日：1994-09-20
申请人： NIPPON STEEL CORP
发明人： NAKAO RYUJI , OKIMORI MAYUMI , IWASAKI HIROSHI , MORISHIGE HIROAKI
IPC分类号： C21C7/00 , C21C7/068 , C21C7/10
摘要： PURPOSE: To provide an effective reduction treatment method, in a refining method of molten chremium-containing steel to execute the vacuum refining after executing the atmospheric refining by using the same refining vessel. CONSTITUTION: At the time of executing the reduction treatment under the vacuum, the treatment is executed under the vacuum of =0.2Nm /min.ton of molten steel. By this method, CO2 gas can be used at the time of executing the reduction treatment and the consumption of expensive Ar gas can be reduced, and the component control to the objective [N] concn. is facilitated.

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