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1. 发明专利

JPH03140406A METHOD FOR DESILICONIZING MOLTEN IRON 失效
公开(公告)号：JPH03140406A
公开(公告)日：1991-06-14
申请号：JP27804889
申请日：1989-10-25
申请人： NIPPON STEEL CORP
发明人： KASHIWABARA TSUKASA , NAKAGAWA JUNICHI , KUGIMIYA SADAJI , KOMORI TOSHIYA
IPC分类号： C21C1/04
摘要： PURPOSE:To efficiency execute pre-desiliconized refining with a small quantity of total oxygen in a short treating time by executing desiliconization by making ratio of gas oxidizer and solid oxidizer as Si oxidizer the specific ratio after lowering temp. of molten iron by adding the specific quantity of cold material at the time of executing the predesiliconizing refining to the molten iron. CONSTITUTION:Before refining the molten iron tapped from a blast furnace into molten steel, Si is oxidized to be converted into slag beforehand and steel making refining efficiency in a converter is improved. In this case, as oxidizing desiliconizing reaction of Si in the molten iron is further improved in the effect thereof as the temp. of molten iron is lower, in order to lower the temp. of molten iron, by adding the cold iron raw material with the quantity Sc shown in the equation 1 the temp. of molten iron is lowered to the suitable temp. the desiliconizing reaction. Successively, under condition of gaseous oxygen ratio [gaseous oxygen quantity/(gaseous oxygen quantity + oxygen quantity in iron oxide) X 100] shown in the equations 2, 3, the desiliconizing treatment is executed to the molten iron. The desiliconizing treatment in the molten iron can be efficiently executed with a small quantity of the oxidizer in a short time and temp. adjustment at the time of steelmaking refining in the converter subsequent to this is facilitated.

2. 发明专利

JPS63307211A METHOD FOR RESTRAINING STICKING OF SLAG TO SUBMERGED FREE BOARD FOR PRETREATING MOLTEN IRON 失效
公开(公告)号：JPS63307211A
公开(公告)日：1988-12-14
申请号：JP14009187
申请日：1987-06-05
申请人： NIPPON STEEL CORP
发明人： KUGIMIYA SADAJI , IMI TETSUO , HAYASHI FUMIO , NAKANO ISAO
IPC分类号： C21C1/00
摘要： PURPOSE:To prevent sticking of slag to inside of a submerged free board at the time of executing pretreatment by inserting a lance into the molten iron from center part of submerged free board by blowing oxygen on upper part of molten iron and burning generated gas. CONSTITUTION:The lower end of the submerged free board 3 is submerged into the molten iron 1 and the lance 4 is inserted into the molten iron 1 from center part of the submerged free board 3. The prescribed treating agent is injected from the lance 4 to execute the pretreatment of the molten iron 1. Then, gas such as air, containing oxygen is blown to the intermediate part of the submerged free board 3 through plural tuyeres 9 from a common piping 8. CO generated during pretreatment of the molten iron is burnt with this oxygen. The inner wall of the submerged free board 3 is heated with high temp. exhaust gas generated with combustion and the sticking of the slag is prevented. Further, the slag once stuck is removed by remelting.

3. 发明专利

JPS6146360A Continuous casting method 失效
标题翻译：连续铸造方法
公开(公告)号：JPS6146360A
公开(公告)日：1986-03-06
申请号：JP16853484
申请日：1984-08-10
申请人： Nippon Steel Corp
发明人： SHIRAI TOKIYA , TSUNEOKA SATOSHI , SEZE AKIFUMI , KUGIMIYA SADAJI
IPC分类号： B22D11/124 , B22D11/12 , B22D11/128
CPC分类号： B22D11/1206
摘要： PURPOSE:To eliminate the macro and micro segregation and center porosity of a billet by maintaining the surface temp. of the billet on the side nearer the mold side than the unsolidified front end at a prescribed temp. and reducing the part near the unsolidified front end according to the rate of shrinkage on solidification and making face support. CONSTITUTION:The billet 3 conducted from a mold 1 of a continuous casting machine to guide rolls 2... is passed through a walking bar type face supporting member 4 and while the part near the unsolidified front end of the billet 3 is grasped by the face, the billet is reduced according to the volume which shrinks on solidification. The surface temp. of the billet on the side nearer the mold than the unsolidified front end is maintained at 600-900 deg.C from about 1 minuet when the increasing to the rigidity to permit the uniform dispersion of the face supporting pressure over the entire shell surface can be expected to about 7 minutes when the expectation of the effective recuperation of the billet after the completion of the solidification under the face support is difficult. The casting of the ingot having no macro and micro segregation and center porosity is thus made possible.
摘要翻译：目的：通过维持表面温度消除钢坯的宏观和微观偏析和中心孔隙度。比未固化的前端更靠近模具侧的钢坯。根据固化收缩率和面部支撑，减少未固化前端附近的零件。构成：从连续铸造机的模具1向引导辊2 ...穿过的坯料3通过行走型面支撑构件4，并且当坯料3的未固化前端附近的部分被根据凝固时收缩的体积，钢坯减少。表面温度的钢坯比未固化的前端更靠近模具的钢坯从约1分钟保持在600-900℃，当增加到刚性以允许在整个壳体表面上的面支撑压力的均匀分散可以是预计大约7分钟后，在面部支撑下凝固完成后有效恢复钢坯的期望是困难的。因此，铸造不具有宏观和微观偏析和中心孔隙的铸锭成为可能。

4. 发明专利

JPH07216421A TUYERE FOR BLAST FURNACE 失效
公开(公告)号：JPH07216421A
公开(公告)日：1995-08-15
申请号：JP1176694
申请日：1994-02-03
申请人： NIPPON STEEL CORP
发明人： KAWAMURA TAKUSHI , NAKAGAWA KOICHIRO , KUGIMIYA SADAJI , INOUE YOSHIHIRO
IPC分类号： C21B7/16
摘要： PURPOSE:To improve the cooling capacity of a tuyere only at the inside of a furnace and to drastically prolong the average service life of the tuyere by providing plural curving grooves along the end surface side of the tuyere tip part in the inner wall of the tip cooling water passage for cooling the tuyere tip part. CONSTITUTION:The curved grooves 4 are externally provided and communicated on the inner wall of the water passage 3 along the longitudinal direction of the water passage 3 for cooling the tip part of the tuyere A for blast furnace. When the depth and width of the groove 4 are defined as L and B respectively, the L/B is made to be >=0.5, and the tip part 4a and the base part 4b of the groove 4 are made to form the round curved surface. Further, the grooves 4 are preferably provided at the outer side from the straight line (Z) with which the center part (Y) of the cross sectional surface of the tip cooling water passage 3 is connected to the tip part (X) of the outer periphery of an inner cylinder of the tuyere A, i.e., at the outer cylinder side. By this method, the periodical exchanging term of the tuyere A can be prolonged.

5. 发明专利

JPH0657315A OPERATION OF BLAST FURNACE BASED ON HYDROGEN GAS UTILIZING RATIO 失效
公开(公告)号：JPH0657315A
公开(公告)日：1994-03-01
申请号：JP21403292
申请日：1992-08-11
申请人： NIPPON STEEL CORP
发明人： KAWAMURA TAKUSHI , INOUE YOSHIHIRO , KUGIMIYA SADAJI , NAITO MASAAKI
IPC分类号： C21B5/00
摘要： PURPOSE:To make the length of a low temp. region proper and to improve the utilizing ratio of reducing gas by measuring furnace gas composition at plural points in the radius direction of a blast furnace, calculating a hydrogen gas utilizing ratio and adjusting the distribution of charged materials at the furnace top based on the calculation. CONSTITUTION:By using sondes 8, 9 at plural positions in the height direction of a bulky zone part 6 in the blast furnace shaft part, the composition and the quantity of the furnace gas are measured and the hydrogen gas utilizing ratio is calculated based on these measured values. By obtaining the difference between these hydrogen gas utilizing ratios and based on the difference, the distribution of the charged materials at the furnace top is adjusted to improve the gas ventilation. By this method, the length of low temp. region in the blast furnace is kept so as to be suitable and the stabilized operation can be continued.

6. 发明专利

JPH04202614A MANGANESE ORE PELLET FOR STEELMAKING REFINING 失效
公开(公告)号：JPH04202614A
公开(公告)日：1992-07-23
申请号：JP33515190
申请日：1990-11-30
申请人： NIPPON STEEL CORP
发明人： KANEKO TOSHIYUKI , KUGIMIYA SADAJI , NAITO MASAAKI
IPC分类号： C21C5/28 , C22B1/14
摘要： PURPOSE:To perform the addition of Mn for steelmaking refining in high yield at a low cost by exerting Mn addition by using Mn ore pellets with a specific composition at the time of subjecting a preliminarily dephosphorized molten pig iron to steelmaking refining in a converter. CONSTITUTION:At the time of producing a molten steel by charging a molten pig iron after preliminary dephosphorizing refining into a converter and exerting decarburizing refining by means of oxygen blowing, Mn addition is performed by using Mn ore pellets consisting of, by weight, 40-60% T.Mn, 6-30% CaO, 2-10% SiO2, 0.5-10% Al2O3, 2-15% T.Fe, and =3, and having 20-40% porosity, or further, one or >=2 kinds among Na2O, NaCl, NaF, K2O, CaF2, CaCl2, and B2O3 are incorporated as a reduction accelerator for MnO by 0.3-5.0%, or, C is further added as a reducing agent for MnO by 5-30% in the case of a raw material with low Mn content. By this method, Mn ore pellets capable of performing Mn addition in high Mn yield at a low cost can be obtained.

7. 发明专利

JPH02179810A METHOD FOR OPERATING TOP AND BOTTOM BLOWING CONVERTER 失效
公开(公告)号：JPH02179810A
公开(公告)日：1990-07-12
申请号：JP33382588
申请日：1988-12-28
申请人： NIPPON STEEL CORP
发明人： TAKAMOTO HISASHI , YONEZAWA KIMITOSHI , KUGIMIYA SADAJI , OCHI KIYOSHI
IPC分类号： C21C5/35
摘要： PURPOSE:To improve Mn yield and to reduce iron content in slag and eroding rate of furnace wall refractory by specifying a bottom blowing gas flow ratio at inner and outer of the fire point in operation of a large-scaled converter specifying the total bottom blowing gas flow rate and gas flow ratio of top blowing and bottom blowing. CONSTITUTION:Stirring gas is blown into molten steel from a single or double tube bottom blowing tuyere at furnace bottom in the large-scaled top and bottom blowing converter having 4000-8000mm furnace bottom diameter and 250-380 Ton/ch at >=0.1Nm /t.min and also O2 gas jet is injected on the molten steel surface with a water cooled top blowing multi-holes lance. Then, this gas flow ratio of the top blowing and the bottom blowing is made to 0.05-0.20. In this operation, the gas flow rate from the bottom blowing tuyere at inside of fire point projecting plane under condition of the lance height at end period of the blowing, is made to 1.2-2.0 ratio to the total gas flow rate from the tuyere at outside.

8. 发明专利

JPH04160108A MANGANESE SINTERED ORE FOR STEEL REFINING AND ITS PRODUCTION 失效
公开(公告)号：JPH04160108A
公开(公告)日：1992-06-03
申请号：JP28561690
申请日：1990-10-23
申请人： NIPPON STEEL CORP
发明人： KANEKO TOSHIYUKI , KUGIMIYA SADAJI , NAITO MASAAKI
IPC分类号： C21C5/28
摘要： PURPOSE:To produce manganese sintered ore which gives high Mn yield for less slag blowing in a converter by specifying the compounding amts. of manganese ore, lime stone, etc., and coke. CONSTITUTION:The manganese ore to be compounded contains =80% of Mn ore is 0.5-5mm grain size, about >=80% of lime stone or quick lime is 0.05-1mm grain size, and about >=80% of coke is 0.5-5mm grain size.

9. 发明专利

JPH03219006A METHOD FOR ADDING MN INTO MOLTEN IRON AND MN AGENT FOR ADDITION 失效
公开(公告)号：JPH03219006A
公开(公告)日：1991-09-26
申请号：JP30020089
申请日：1989-11-18
申请人： NIPPON STEEL CORP
发明人： KANEKO TOSHIYUKI , MATSUZAKI TAKAFUMI , KUGIMIYA SADAJI , NAKANO SHINYA
IPC分类号： C21C5/28 , C21C5/52
摘要： PURPOSE:To improve Mn yield and to reduce the adding cost in producing Mn by using Mn ore having a specific value or less of contained decomposable oxygen content at the time of adding Mn into molten iron. CONSTITUTION:At the time of adding Mn into the molten iron, the Mn ore contg. =560 deg.C is used or the Mn ore containing in one or plural kinds of MnO2, Mn2O3, Mn3O4 and sintered at >=1000 deg.C, is used. By this method, Mn can be added with high Mn yield and at a low adding cost.

10. 发明专利

JPH0379710A METHOD AND APPARATUS FOR TREATING DESILICONIZATION IN MOLTEN IRON 失效
公开(公告)号：JPH0379710A
公开(公告)日：1991-04-04
申请号：JP21288989
申请日：1989-08-21
申请人： NIPPON STEEL CORP
发明人： TAKAMOTO HISASHI , HONDA KIYOYUKI , KUGIMIYA SADAJI , TABUCHI SATOSHI
IPC分类号： C21C1/04
摘要： PURPOSE:To enable stable operation even if oxygen feeding velocity is raised by improving nozzle structure of a lance for blowing gaseous oxygen and oxidizing material submerging into in a reaction vessel and giving gaseous oxygen circular flow. CONSTITUTION:The oxidizing material of iron ore, dust, lime, etc., from a hopper 14 is injected into the lance 3 through N2 as carrier gas and at the same time, the gaseous oxygen is injected, too. Desiliconizing material is blown into the molten iron 2 charged in a torpedo car 1 from an injection nozzle 4 at tip part of the lance 3 to treat the molten iron. In the injection nozzle 4, outer circumferential face of a blade part 10-1 in an inner nozzle 8 is fitted to inner face of an outer nozzle 5 and a spiral-state injection member 12 is fixed to the inner face of the nozzle 5. The oxidizing material from the lance 3 is injected into the molten iron 2 from blade gap part 10-2 constituted with the nozzle 5 and 8. On the other hand, the gaseous oxygen is injected into the molten iron 2 while circulating as spiral-state from a gap part 13 constituted with inner face of the nozzle 8 and a member 12.

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