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1. 发明专利

JPH05169210A DISCHARGING TREATMENT APPARATUS FOR PLUGGING SAND IN LADLE AND REMAINED STEEL SLAG IN TUNDISH IN CONTINUOUS CASTER 失效
公开(公告)号：JPH05169210A
公开(公告)日：1993-07-09
申请号：JP34067691
申请日：1991-12-24
申请人： KAWASAKI STEEL CO
发明人： MATSUKAWA TOSHITANE , UMADA HAJIME
IPC分类号： B22D11/10 , B22D43/00
摘要： PURPOSE:To facilitate an exchange of a pot from a discharging treatment apparatus even if metal is burning-stuck to the charging/ discharging pot for discharging plugging sand in a ladle and carrying. CONSTITUTION:The pot 18 supported through pot shafts 22 to open type shaft receivers 21 opening the upper parts of brackets 17 fitted to a lifting frame 14 at the upper end part of a guide frame 8, is waited. At the time of discharging the plugging sand filled in a steel discharging hole in the ladle 1 into the pot 18, by driving a driving device 16, a wire is wound back and the pot 18 is descended and laid on a shifting carriage 27 in the lower end part. Then the pot shafts 22 are automatically detached from the open type shaft receiver 21. As the pot shafts 22 are supported on the open type shaft receiver 21 opening the upper parts, even if the pot 18 can not be used because the metal is burning- stuck, the exchange with the spare pot is facilitated.

2. 发明专利

JPH03226516A VACUUM DEGASSING DEVICE FOR PRODUCTION EXTRA-LOW CARBON STEEL AND OPERATING METHOD THEREOF 失效
公开(公告)号：JPH03226516A
公开(公告)日：1991-10-07
申请号：JP2144490
申请日：1990-01-31
申请人： KAWASAKI STEEL CO
发明人： NOGUCHI KATSUHIRO , UMADA HAJIME
IPC分类号： C21C7/10
摘要： PURPOSE:To smelt an extra-low carbon steel with high efficiency by forming a vacuum degassing chamber and up- and down immersing pipes to elliptical shapes in the direction perpendicular to each other and blowing high-pressure gases from the perforated fine pipes in the lower part of the up immersing pipe while top blowing oxygen. CONSTITUTION:The up- and down immersing pipes 4, 6 in the lower part of the vacuum degassing chamber 2 having a top blowing lance 30 pendent through an upper cap 28 are immersed into the molten steel 8 in a ladle 3. The inside of this vacuum degassing chamber 2 is evacuated to a vacuum and a reflux gas is blown from the lower part of the up immersing pipe 4. The reflux of the molten steel is thereby caused and the oxygen and/or inert gas is blown from the above-mentioned top blowing lance 30 into this molten steel. All of the vacuum degassing chamber 2 and immersing pipes 4, 6 of the above-mentioned vacuum degassing device are formed to the elliptical shapes and are combined by intersecting the major axes thereof with each other. Further, the plural perforated fine pipes 14 are erected on a refractory bridge 12 provided at the center in the lower part of the up immersing pipe 4. The high-pressure gases and, if necessary, powdery oxides are blown therefrom. The stagnation area of the reflux is eliminated in this way and the reaction boundary area is increased. The extra-low carbon steel of about

3. 发明专利

JPH03221247A METHOD FOR REPLACING AIR TO NON-OXIDIZED ATMOSPHERE IN TUNDISH FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH03221247A
公开(公告)日：1991-09-30
申请号：JP1616890
申请日：1990-01-29
申请人： KAWASAKI STEEL CO
发明人： SEKIGUCHI HIROSHI , UMADA HAJIME
IPC分类号： B22D11/10
摘要： PURPOSE:To efficiently replace air to non-oxidized atmosphere and to improve working ratio of a continuous casting machine by inserting a reverse T shaped gas blowing pipe into near bottom face of a tundish from an opening hole for gas burner and softly blowing argon gas to the horizontal direction from the tip part thereof. CONSTITUTION:The reverse T shaped gas blowing pipe 3 connected and supported with a gas supplying pipe 11 through combustible material of a paper- made connecting cylinder 9 from the opening hole 6 for burner in a tundish cover 2 is inserted into near the bottom face of tundish body 1, and gap between the opening hole 6 for burner and the gas supplying pipe 3 is sealed with a sealing material 13. The Ar gas is supplied from the gas supplying pipe 11 and at the time of softly blowing the Ar gas to the horizontal direction from the tip part of reverse T shaped gas blowing pipe 3, the Ar gas having sp. gr. larger than that of the air, is spread to lower space of the tundish body 1 and stayed. Therefore, the Ar gas efficiently replaces the air into the non- oxidized atmospheric condition with piston model, which the air having small sp. gr. is gradually pushed out to the upper space in the tundish body 1.

4. 发明专利

JPH01215951A METHOD FOR REFINING CHROMIUM-CONTAINING STEEL 失效
公开(公告)号：JPH01215951A
公开(公告)日：1989-08-29
申请号：JP3972088
申请日：1988-02-24
申请人： KAWASAKI STEEL CO
发明人： NABESHIMA YUKI , TAOKA KEIZO , YAMADA SUMIO , UMADA HAJIME
IPC分类号： C21B11/00 , C21B13/00 , C21C7/068 , C22C33/04
摘要： PURPOSE:To shorten refining time for chromium-containing steel of low C and N content by specifying slag basicity, C concentration, etc., at the time of smelting-reduction refining, recovering chromium oxide in slag after rough decarburizing refining, and then carrying out finish decarburizing refining. CONSTITUTION:Chromium-containing oxide, such as chromium ore and semireduced chromium pellet, is subjected to smelting-reduction refining in a refining furnace equipped with a top blowing function. At this time, respective conditions of 2.1-3.5 slag basicity(CaO/SiO2), >=10wt.% residual carbon in slag, >=4.0% carbon in molten iron, and >=1500 deg.C molten iron temp. are satisfied. After the resulting chromium-containing molten iron is subjected to rough decarburizing refining, chromium oxide in the slag is reduced and recovered so that Si content in molten steel is regulated to 0.05-0.10%. Subsequently, finish decarburizing refining is carried out, by which the chromium-containing steel of low C and N content is refined. By this method, operating time can be shortened and productivity can be improved.

5. 发明专利

JPH01215949A SMELTING-REDUCTION REFINING METHOD FOR CR OXIDE 失效
公开(公告)号：JPH01215949A
公开(公告)日：1989-08-29
申请号：JP4060188
申请日：1988-02-25
申请人： KAWASAKI STEEL CO
发明人： TADA MUTSUMI , YAMADA SUMIO , TAOKA KEIZO , UMADA HAJIME
IPC分类号： C22B34/32 , C22C33/04
摘要： PURPOSE:To improve Cr yield in molten iron by putting the prescribed amount of slag into a converter prior to the smelting reduction of Cr oxide at the time of manufacturing Cr-containing molten iron. CONSTITUTION:Slag is put at least by 50kg/t into a top-blown converter in which iron bath is previously held. Subsequently, Cr oxide is supplied to undergo smelting/reduction refining, by which Cr-containing melted iron can be manufactured. By this method, the generation of dust causing reduction in Cr yield can be inhibited. Further, dust clogging in an OG hood, trouble, in OG dust collection water treatment equipment, etc., can be removed or reduced.

6. 发明专利

JPH01215912A MANUFACTURE OF MOLTEN CHROMIUM-CONTAINING PIG IRON 失效
公开(公告)号：JPH01215912A
公开(公告)日：1989-08-29
申请号：JP3971988
申请日：1988-02-24
申请人： KAWASAKI STEEL CO
发明人： YAMADA SUMIO , TADA MUTSUMI , TAOKA KEIZO , UMADA HAJIME
IPC分类号： C21B11/00 , C21B13/00 , C21C5/00 , C21C5/35
摘要： PURPOSE:To manufacture molten chromium-containing pig iron at high Cr yield by dividing the whole process into scrap melting period, temp. raising period and Cr ore addition, melting and reducing period at the time of manufacturing the molten Cr-containing iron for raw material of stainless steel by oxygen-blowing in an oxygen top blowing converter while using stainless steel scrap, molten iron and chromium ore as raw material. CONSTITUTION:After charging the stainless steel scrap, pre-dephosphorized molten iron, slag making agent of lime, etc., and carbonic material in the oxygen top blowing converter (or combined blowing converter), the stainless steel scrap is melted by oxygen-blowing with a top blowing lance. Successively, the oxygen-blow is continued to rapidly raise the molten metal temp. and at the same time of reaching to >=1,500 deg.C the prescribed temp., the Cr ore and the carbonic material are added to reduce Cr2O3 in the Cr ore into Cr carbide with the carbonic material. Then, by changing carbon content [C] into [C]>=4.03+0.084[Cr] ([Cr] is Cr content in the molten metal), the molten chromium iron for raw material of the stainless steel is manufactured at high reducing recovery ratio of Cr in the Cr ore under little erosion of the converter refractory for short time.

7. 发明专利

JPH01205056A MELTING-REDUCING REFINING METHOD FOR CR ORE 失效
公开(公告)号：JPH01205056A
公开(公告)日：1989-08-17
申请号：JP2775388
申请日：1988-02-10
申请人： KAWASAKI STEEL CO
发明人： NABESHIMA YUKI , YAMADA SUMIO , TAOKA KEIZO , UMADA HAJIME
IPC分类号： C22B34/32 , C22C33/04
摘要： PURPOSE:To easily recover Cr content in ores in high yield by using Cr ores while blending Cr ores in which the value of the ratio of MgO to Al2O3, as gangue components in the ores, is high and those in which the above value is low at the time of recovering Cr from the Cr ores by adding Cr ores to melted iron to reduce Cr2O3 in the ores. CONSTITUTION:At the time of charging Cr ores into molten iron in a refining furnace, such as top and bottom blown converter, and recovering Cr2O3 by reducing Cr2O3 in the ores by means of C in the molten iron or a separately added carbonaceous reducing agent, the ores in which the ratio of MgO to Al2O3 in gangue minerals in the Cr ores is regulated to >=1 are used in combination with those in which the above value is regulated to

8. 发明专利

JPS6376812A RECYCLING METHOD FOR DOUBLE PIPE TUYERE 失效
公开(公告)号：JPS6376812A
公开(公告)日：1988-04-07
申请号：JP21980586
申请日：1986-09-19
申请人： KAWASAKI STEEL CO
发明人： NOMURA HIROSHI , UMADA HAJIME
IPC分类号： C21C5/48
摘要： PURPOSE:To easily recycle worn tuyere at low cost by taking out an inner pipe when the tip part of tuyere retreats from the refractory level by melting loss, inserting it in an outer pipe after plugging the tip part thereof by refractory and eliminating the tip part containing the refractory in the inner pipe by continuation of refining. CONSTITUTION:When the tip part of double pipe tuyere retreats from the outskirt of refractory level by melting-loss caused by burnback phenomenon, the inner pipe 3 is once taken out and the tip opening part is perfectly plugged by disk-like iron-plate 4, and further bar-like refractory 6 coated by mortar 5 on the outside thereof is pushed into the inner pipe 3. Then, the inner pipe 3 is plugged by refractory 6 up to a position, of at least about 5mm (l>=5mm) apart from the tip part position of outer pipe 1 toward outside direction. This inner pipe 3 is inserted in the outer pipe 1 and the pipes 3, 1 are connected with the gas introducing pipe respectively, to reopen the blowing. In this way, at first, the tip part of outer pipe 1 is eliminated in the few heats of blowing and then the cooling gas starts to flow, and next, the tip part of inner pipe containing the refractory 6 is eliminated in few heats of blowing and normal gas flow is recovered at each inner and outer pipes 3, 1.

9. 发明专利

JPS6213513A REFINING METHOD IN REFINING FURNACE PROVIDED WITH TOP BLOWING LANCE 失效
公开(公告)号：JPS6213513A
公开(公告)日：1987-01-22
申请号：JP15122085
申请日：1985-07-11
申请人： KAWASAKI STEEL CO
发明人： KAMEYAMA KYOICHI , UMADA HAJIME , YAMADA SUMIO , ISODA NAOSHI , EMOTO KANJI
IPC分类号： C21C5/32 , C21C5/30 , C21C5/35 , C21C5/46
摘要： PURPOSE:To prevent the acceleration of the local corrosion of bricks forming the wall of a refining furnace when refining is carried out with a top blowing lance having a main nozzle for refining and sub-nozzles for secondary combustion at the tip part, by rotating the top blowing lance during refining. CONSTITUTION:A top blowing lance 2 having a main nozzle for refining and sub-nozzles for secondary combustion is put in a converter 1 to refine molten steel 6. At this time, the top blowing lance 2 is repeatedly rotated and stopped with a prescribed rotating mechanism for rotating the lance 2 in an arbitrary direction at an arbitrary speed. The lance 2 is vertically movable. Thus, the formation of a hot spot on the wall 10 of the converter 1 by local overheating is prevented.

10. 发明专利

JPS58119444A SEALING METHOD OF LONG NOZZLE IN INITIAL PERIOD OF CHARGING OF MOLTEN STEEL 失效
公开(公告)号：JPS58119444A
公开(公告)日：1983-07-15
申请号：JP175382
申请日：1982-01-11
申请人： KAWASAKI STEEL CO
发明人： UMADA HAJIME , KAKIHARA SETSUO
IPC分类号： B22D11/10 , B22D41/50
摘要： PURPOSE:To prevent the degradation in the quality of molten steel during the time until the bottom end of a long nozzle for charging molten steel is immersed in the molten steel by sticking a cylinder made of a material which is eroded or annihilates to the bottom end of said nozzle. CONSTITUTION:In starting charging of molten steel from a ladle 1 into a tundish 3 for continuous casting, a cylinder 5 made of an eroding material such as thin iron sheet or a material such as carboard or the like which burns away is stuck by means of a band or the like to the bottom end of a long nozzle 4 to extend the nozzle 4 temporarily downward. The charging flow 2a of the molten metal is kept sealed until the body of the nozzle 4 is immersed in the molten steel, whereby the quality of the molten steel is protected.

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