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1. 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。

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.

4. 发明专利

JPH09316609A HIGH CLEANLINESS AUSTENITIC STAINLESS STEEL 失效
公开(公告)号：JPH09316609A
公开(公告)日：1997-12-09
申请号：JP15288596
申请日：1996-05-27
申请人： NIPPON STEEL CORP
发明人： NAKAO RYUJI , MIYAZAKI MASAFUMI , TAKANO HIRONORI , NAKANO TAKESHI , HATA KOKI , FUKUMA HIROMICHI
IPC分类号： F16B35/00 , C21C7/00 , C21C7/04 , C22C38/00 , C22C38/40 , F16F1/02
摘要： PROBLEM TO BE SOLVED: To produce an austenitic stainless steel excellent in wire drawability, heading property and fatigue strength as a screw material or a spring material. SOLUTION: This austenitic stainless steel is the one in which the concn. of [Ca] is regulated, by mass, to 0.0015 to 0.0050%, [Al] to 0.015 to 0.050% and [O] to 0.0015 to 0.0050%, and the main nonmetallic inclusions present in the steel are composed of multiple inclusions of CaO and Al2 O3 .

5. 发明专利

JPH09316523A HARDLY HYDRATING EXPANDABLE OR HARDLY POWDERING SLAG AND TREATMENT OF SLAG REMOVAL THEREOF 失效
公开(公告)号：JPH09316523A
公开(公告)日：1997-12-09
申请号：JP15913996
申请日：1996-05-31
申请人： NIPPON STEEL CORP , HAMADA JUKO
发明人： NAKAO RYUJI , TAKANO HIRONORI , MATSUNAMI TADANORI , NAKAYAMA MITSURU , HARADA EIJI , NAGAO YOSHIICHI
IPC分类号： C21C5/54 , F27D15/00
摘要： PROBLEM TO BE SOLVED: To prevent the hydrating expansion and the powdering of slag after removing the slag by adjusting the slag composition in the specific range according to a target, at the time of removing the slag produced in melting or refining of the chromium-containing steel. SOLUTION: At the time of separating and removing the slag produced in the melting process or the refining process of the chromium-containing steel, the slag composition is adjusted so that one side or both of a slag expansion index M and slag powdering index D defined in equations (1), (2) and (3) satisfy zero or lower. Each oxide and T.Fe in equations (1) to (3) show each concn. (mass%) and X shows CaO/SiO2 . The M and the D values are obtd. by executing the analysis of the slag composition. In the case only the M value exceeds zero, one side or both of Al2 O3 source and SiO2 source are added in the slag. In the case only the D value or both values of the M and the D exceed zero, SiO2 source is added in the slag. The slag, in which the M value and D value become zero or lower, is separated from the molten metal surface.

6. 发明专利

JPH09316520A CHROMIUM-CONTAINING STEEL SLAG AND TREATMENT OF SLAG REMOVAL THEREOF 失效
公开(公告)号：JPH09316520A
公开(公告)日：1997-12-09
申请号：JP15913796
申请日：1996-05-31
申请人： NIPPON STEEL CORP , HAMADA JUKO
发明人： NAKAO RYUJI , TAKANO HIRONORI , MATSUNAMI TADANORI , HARADA EIJI , NAKAYAMA MITSURU , NAGAO YOSHIICHI
IPC分类号： C21C5/36 , C21C7/00 , C22C38/18
摘要： PROBLEM TO BE SOLVED: To prevent the hydrating-expansion of slag after removing the slag by adjusting the slag composition in a specific range, at the time of separating and removing the slag produced in melting or refining of a chromium-containing steel from the molten steel surface. SOLUTION: At the time of separating and removing the slag produced in the melting process or the refining process of the chromium-containing steel from the molten steel surface, the slag composition is adjusted so that slag expanding index M defined with equalities (1), (2) satisfies zero or lower. In equality (1), CaO, SiO2 , MgO, Cr2 CO3 , Al2 O3 and T.Fe show each concns. (mass%) and X in equation (2) shows CaO/SiO2 . The adjustment of the slag components obtains the M value in equality (1) by executing the analysis of the slag composition. In the case the M value exceeds zero, Al2 O3 source or SiO2 source or both of these sources are added into the slag, and the M value is adjusted so as to become zero or lower to make a hardly hydrating expandable slag.

7. 发明专利

JPH08295917A METHOD FOR MAKING CHROMIUM OXIDE IN DUST AND SLUDGE GENERATED AT THE TIME OF PRODUCING CHROMIUM-CONTAINING STEEL INSOLUBLE 失效
公开(公告)号：JPH08295917A
公开(公告)日：1996-11-12
申请号：JP10414395
申请日：1995-04-27
申请人： NIPPON STEEL CORP
发明人： NAKAO RYUJI , TAKANO HIRONORI , YAMAMOTO TETSUYA , MATSUNAMI TADANORI
IPC分类号： C21C5/28 , C21C7/00 , C21C7/064 , F27D17/00
摘要： PURPOSE: To make chromium oxide included in dust and sludge generated at the time of producing chromium-containing steel insoluble. CONSTITUTION: When molten slag is separated or removed from a surface of a molten steel bath by adding dried dust and sludge to form molten slag in a furnace executing melting or refining of chromium-containing steel desulfurization distribution ratio (S)/[S] between molten steel and slag is adjusted so as to satisfy a formula described hereunder: (S)/[S]>=10 , where X=(CaO)/(SiO2 ). Further, in order to promote desulfurization, melt-refining time is made longer or a deoxidizer such as Si and Al is added thereto. Thereby elution of hexavalent chromium from discharged slag is eliminated, to make chromium oxide in dust and sludge insoluble is attained and dust and sludge can be utilized as resources.

8. 发明专利

JPS5913889A Method of preheating raw material in electric furnace 失效
标题翻译：在电炉中预热原料的方法
公开(公告)号：JPS5913889A
公开(公告)日：1984-01-24
申请号：JP12347782
申请日：1982-07-15
申请人： Nippon Steel Corp
发明人： TAKAO MASAO , TAKANO HIRONORI
IPC分类号： F27D13/00 , F27B3/08

9. 发明专利

JPH10152718A METHOD FOR MELTING CHROMIUM-CONTAINING STEEL 失效
公开(公告)号：JPH10152718A
公开(公告)日：1998-06-09
申请号：JP32800396
申请日：1996-11-25
申请人： NIPPON STEEL CORP
发明人： NAKAO RYUJI , KANEKAWA MASARU , TAKANO HIRONORI
IPC分类号： C21C5/52
摘要： PROBLEM TO BE SOLVED: To shorten molten time, to reduce the unit requirement of electric power and to drastically improve productivity and cost by blowing a special quantity of mixed gas of the air and the oxygen having a specific oxygen ratio per ton of molten steel into the molten steel. SOLUTION: The air or the mixed gas is blown into the molten steel 3 from a bottom-blown nozzle 6 arranged at the bottom part of an electric furnace 1 or from a lance inserted from a furnace belly part into the furnace. In the case of melting a chromium-containing steel by this method, into the molten steel at the time of melting unmelting raw material 4 charged in the electric furnace 1 at >=80vol%, the air or the mixed gas of the air and the oxygen having 21-50vol% oxygen ratio is blown at 0.3Nm /min.ton of the molten steel. Then, [Si] concn. in the raw material and the oxygen ratio in the mixed gas are adjusted according to a target [Si] concn. in the molten steel. By this method, the hitting of the target [Si] concn. after melting can easily be obtd. by adjusting gas blowing condition, etc.

10. 发明专利

JPH1062077A METHOD FOR PREVENTING LOCAL MELTING LOSS OF FURNACE WALL REFRACTORY MATERIAL OF ARC FURNACE 失效
公开(公告)号：JPH1062077A
公开(公告)日：1998-03-06
申请号：JP22158496
申请日：1996-08-22
申请人： NIPPON STEEL CORP
发明人： TSUKAMOTO RYUTA , HOSOI YOSHIRO , YANO HIROSHI , TAKANO HIRONORI
IPC分类号： H05B7/144 , F27B3/08 , F27D11/08 , F27D21/00 , H05B7/148
摘要： PROBLEM TO BE SOLVED: To equalize the quantity of fusing damage of a hot spot refractory material by simultaneously adjusting phase currents of three phase based on a correction factor obtained by calculation from the equivalent circuit of an arc furnace. SOLUTION: In a three-phase AC arc furnace 3, the remaining thickness of each hot spot refractory material is actually measured every time only one phase current is adjusted, and the fusing damage speed of the refractory material is obtained based on the number of times of melting. Arc resistance in the equivalent circuit of the AC arc furnace 3 is arbitrarily applied so that each phase current is inversely calculated according to a prescribed procedure and the fusing damage factor of the refractory material as a parameter most correlative to the refractory material fusing damage speed of each phase is obtained. After the special furnace of the AC arc furnace 3 is repaired upon high power operation, a phase current correction factor is obtained from the relation between the refractory material fusing damage factor and the refractory material fusing damage speed for each of the three phases, and the phase currents of three phase are simultaneously set based on this value. As a result, the quantity of three phase refractory material fusing damage is substantially equalized. Thus, since a phase current balance is adjusted suitably for an actual operation, a local refractory material fusing damage is efficiently suppressed, and the life of the furnace can be thus effectively extended.

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