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21. 发明专利

JPS6384750A CONTINUOUS CASTING NOZZLE 失效
公开(公告)号：JPS6384750A
公开(公告)日：1988-04-15
申请号：JP22990086
申请日：1986-09-30
申请人： NIPPON STEEL CORP
发明人： ISHII AKIO , ISHIKAWA ATSUSHI , NAKAMURA YUKIHIRO
IPC分类号： B22D11/10 , B22D41/54 , C04B35/581 , C04B35/583
摘要： PURPOSE:To prevent the deposit by sticking inclusion to an inner face of nozzle by blending boron nitride, aluminum nitride and graphite at the specific ratio and forming the nozzle for continuous casting having low wettability to molten steel and composition series for supplying no oxygen into the molten steel. CONSTITUTION:By blending 20-70wt% parts boron nitride, 10-40pts.wt. aluminum nitride and 10-30pts.wt. graphite, the nozzle for continuous casting having low wettability to the molten steel and composition series for supplying no oxygen into the molten steel is formed. In this way, the deposit by sticking the inclusion to the inner face of nozzle is prevented. This nozzle is particularly suitable to the continuous casting for Al deoxidizing steel.

22. 发明专利

JPS6134112A Converter blowing method capable of varying capacity 失效
标题翻译：具有改变容量的转换器吹扫方法
公开(公告)号：JPS6134112A
公开(公告)日：1986-02-18
申请号：JP15345084
申请日：1984-07-24
申请人： Nippon Steel Corp
发明人： YAMAMOTO ZENSAKU , INOUE TAKASHI , HARIGAI YUJI , ISHIKAWA ATSUSHI , KUDO ICHIRO
IPC分类号： C21C5/28 , C21C5/30 , C21C5/35
CPC分类号： C21C5/35 , C21C5/30
摘要： PURPOSE:To perform blowing operation efficiently, by specifying the range of a shape factor (steel bath depth / bath surface diameter), and fixing total stirring force per unit molten steel quantity, at blowing in the same converter at every lot with varying variously refining molten steel quantity. CONSTITUTION:At molten steel blowing by converter, the shape factor L0/D0 defined from L0 and D0 as steel bath depth and bath surface diameter respectively is adjusted to 0.15-0.50. Thus all respective times for slag and metal reaction, uniform mixing and gas and metal reaction are shortened. In case said factor is varied in actual operation, control of blowing condition is required for ensuring suitable stirring force. Namely, independently of molten steel quantity charged into converter, the control is necessary by obtaining oxygen passing rate, distance between lance and bath surface, blowing gas quantity for maintaining fixed total stirring force per unit molten steel quantity, while protecting furnace wall.
摘要翻译：目的：通过指定形状因子（钢槽深度/浴面直径）的范围，并且固定每单位钢水量的总搅拌力，通过改变各种精炼在每个批次的同一转炉中吹塑来进行吹塑操作钢水量。构成：在转炉熔炼钢水中，由L0和D0定义的形状因子L0 / D0分别作为钢浴深度和浴面直径调整为0.15-0.50。因此，渣和金属反应，均匀混合和气体和金属反应的所有时间都缩短了。在实际操作中所述因素变化的情况下，为了确保合适的搅拌力，需要控制吹送状态。即，独立于投入转炉中的钢水量，通过获得氧气通过率，喷枪和熔池表面之间的距离，吹送气体量来维持每单位钢水量的固定的总搅拌力，同时保护炉壁，需要进行控制。

23. 发明专利

JP2000178637A LADLE REFINING APPARATUS AND LADLE REFINING METHOD USING THIS APPARATUS 失效
公开(公告)号：JP2000178637A
公开(公告)日：2000-06-27
申请号：JP36281898
申请日：1998-12-21
申请人： NIPPON STEEL CORP
发明人： KIMURA HIDEAKI , ISHIKAWA ATSUSHI , ISHII HIROMI , ARAI MASAYUKI , AOKI ATSUSHI
IPC分类号： B22D1/00 , C21C7/10 , F27D3/16
摘要： PROBLEM TO BE SOLVED: To provide a ladle refining apparatus, in which the stickiness of skull on a vessel is restrained and the stirring of molten steel, the reformation of slag and the degassing are efficiently executed, and a ladle refining method using this apparatus. SOLUTION: In the apparatus for executing the refining of the molten steel by directly connecting a vacuum-reduced pressure vessel 2 with the upper part of the ladle 1 and blowing stirring gas 6 with inert gas into the ladle, the inner diameter in the vacuum-reduced pressure vessel is formed as the inner diameter at the upper end part of the ladle or shorter and the diameter D of the projecting cross sectional surface of rising portion 7 on the molten steel surface develope with the stirring gas 6 blown in the ladle or longer.

24. 发明专利

JPH0871706A COATING BELT FOR TYPE CONTINUOUS CASTER 失效
公开(公告)号：JPH0871706A
公开(公告)日：1996-03-19
申请号：JP21583594
申请日：1994-09-09
申请人： NIPPON STEEL CORP
发明人： SAITO TATSUKI , TANNO HITOSHI , KANAI NORIYUKI , MATSUO SHINJI , ISHIKAWA ATSUSHI
IPC分类号： B22D11/04 , B22D11/059 , B22D11/06
摘要： PURPOSE: To provide the coating belt for belt type continuous caster capable of preventing peeling of heat insulating layer and sticking of fusion coating material to insulating layer. CONSTITUTION: In the coating belt for belt type continuous caster, in which a heat insulating layer 2 and fusion coating layer 4 are formed on the molten steel side of a metal made belt main body 1, a reaction suppressing layer 3 to suppress reaction is formed between the heat insulating layer 2 and fusion coating layer 4. The reaction suppressing layer 3 prevents sticking/penetrating of secondary cooling water for cast slab and belt cooling water to the heat insulating layer, chemical reaction between the heat insulating layer and fusion coating material and sticking of fusion coating material to the heat insulating layer 2.

25. 发明专利

JPH0833954A TWIN BELT TYPE CONTINUOUS CASTING METHOD 失效
公开(公告)号：JPH0833954A
公开(公告)日：1996-02-06
申请号：JP16836794
申请日：1994-07-20
申请人： NIPPON STEEL CORP
发明人： KAJITANI TOSHIYUKI , WAKAO MASAMITSU , ONO TAKEMASA , MATSUO SHINJI , ISHIKAWA ATSUSHI
IPC分类号： B22D11/124 , B22D11/06 , B22D11/22
摘要： PURPOSE:To prevent the development of a crack to be a defect by controlling an air gap quantity developed in a long wall side at the corner part of a mold by the position of fins in a fin roll nearest to the short wall to make the solidifying speeds of molten steel in the long wall and the short wall of the mold almost equal to each other. CONSTITUTION:The mold 9 formed of a pair of belts 7a, 7b synchronously shifted with the speed of the cast slab endlessly and having the back surface thereof supported with fin rolls 11 arranged on a cooling box 10 and of a pair of shifting short side blocks 8a, 8b composed of plural blocks, is used. The air gap quantity (ag) developed on the long side at the corner part 9c of the mold is controlled by the position of a fin 11n of the fin rolls 11 nearest to the short side to make the solidifying speeds of the molten steel in the long side and the short side of the mold almost equal to each other. By this method, the air cap quantity developed in the corner part of the mold can be controlled and the solidifying speeds of the long side and the short side are made almost equal to prevent the development of the crack to be the defect in the edge parts on the sides of the long side and the short side of the cast slab.

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