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1. 发明专利

JPH0741827A METHOD FOR VACUUM-REFINING MOLTEN STEEL 失效
公开(公告)号：JPH0741827A
公开(公告)日：1995-02-10
申请号：JP17569593
申请日：1993-07-15
申请人： NIPPON STEEL CORP
发明人： ONUKI KAZUO , NAGAHAMA HIROSHI , HOSHIJIMA YOSUKE , IGUCHI MASAO , FUKUDA KAZUHISA , MIFUKU HIROKI
IPC分类号： C21C7/04 , C21C7/10
摘要： PURPOSE:To restrain the lowering of molten steel temp. and to improve the refining efficiency by heating the molten steel surface with a burner, at the time of vacuum-refining the molten steel while injecting oxide powder in the molten steel surface. CONSTITUTION:The molten steel in a ladle 1 is sucked and circulated into the vacuum treating appartus 2 arranged on the ladle 1 to execute the vacuum treatment. The oxide powder of silicon, manganese or iron is injected on the molten steel surface while restraining the lowering of the molten steel temp. by using the burner in a lance 7 arranged at the upper part of the vacuum treating apparatus 2 during treating to execute the decarburization, denitrogenization and dehydrogenization. The reaction between the oxide powder and the molten steel can be promoted because the molten steel surface is made into high temp. by heating with the burner and the injected oxide powder is also heated before reaching the molten steel surface. Further, there is no necessity to make the molten steel temp. high beforehand in consideration for the calory to conduct the heat with the oxide powder.

2. 发明专利

JP2001316712A METHOD FOR RECOVERING CHROMIUM FROM CHROMIUM CONTAINING SLAG 失效
公开(公告)号：JP2001316712A
公开(公告)日：2001-11-16
申请号：JP2000133622
申请日：2000-05-02
申请人： NIPPON STEEL CORP
发明人： OGAWA YUJI , NAGAHAMA HIROSHI , KITAMURA SHINYA
IPC分类号： C22B5/04 , C21C5/28 , C21C5/52 , C22B5/10 , C22B7/04 , C22B34/32
摘要： PROBLEM TO BE SOLVED: To provide a method of treating chromium containing slug by which chromium is efficiently recovered into a low content by reduction and also the chromium containing slag is made harmless just as the slag of a plain carbon steel is and the effective utilization of the slag as a road-bed material and a civil landfill material can be attained without developing the environmen tal contamination. SOLUTION: In a process for heating, refining or producing molten steel by forming an arc between electrodes and the molten steel or scrap, one or more electrodes are made into a hollow electrode and the chromium containing slag containing >=0.5 mass% Cr and a reducing agent are blown into the arc by carrying them with inert gas through the hollow electrode, and the chromium oxide in the chromium containing slag is reduced to recover the chromium into the molten steel. Further, as the reducing agent, carbonaceous material, aluminum ash, aluminum dross, Fe-Si, Al or a mixture of two or more species thereof is used.

3. 发明专利

JP2000234114A METHOD FOR MELTING SCRAP 失效
公开(公告)号：JP2000234114A
公开(公告)日：2000-08-29
申请号：JP3350999
申请日：1999-02-10
申请人： NIPPON STEEL CORP
发明人： OGAWA YUJI , NAGAHAMA HIROSHI , IDEMOTO YOJI
IPC分类号： C22B9/16 , C21B11/00 , C21B11/06 , C21B11/10 , C21B13/14 , C21C5/28 , F27D13/00
摘要： PROBLEM TO BE SOLVED: To provide a method for preventing slopping and efficiently realizing scrap melting in a scrap melting furnace. SOLUTION: In the method for melting the scrap and producing molten steel having

4. 发明专利

JPH10185902A INCLUSION EVALUATION METHOD 失效
公开(公告)号：JPH10185902A
公开(公告)日：1998-07-14
申请号：JP34072996
申请日：1996-12-20
申请人： NIPPON STEEL CORP
发明人： ISONO TAKAHIRO , NAGAHAMA HIROSHI
IPC分类号： G01N15/02 , G01N33/20
摘要： PROBLEM TO BE SOLVED: To quickly and accurately evaluate the particle diameters and shape distribution of non-metallic inclusion in steel by casting illumination from one direction of the inclusion extracted and separated from the steel, and image- analyzing silhouette of inclusion particles which is formed by the transmission light. SOLUTION: Inclusion extracted from steel is collected, for instance, by a cellulose filter, which is stuck on a preparation 1, and reacted with acetone or the like to make it transparent. The transparent preparation (observation sample) 1 is disposed on a movable stage 4 so as to be at a right angle on the straight line on which a light source 2 and a TV camera 3 are connected, and light from the light source 2 is applied to obtain the silhouette image of inclusion particles. The particle diameters, shape and the number of the inclusion in the steel are measured and evaluated by image-analyzing the silhouette. Thereby, quality of the steel material can be quickly and accurately evaluated.

5. 发明专利

JPH07292411A VACUUM DEGASSING APPARATUS 失效
公开(公告)号：JPH07292411A
公开(公告)日：1995-11-07
申请号：JP8343094
申请日：1994-04-21
申请人： NIPPON STEEL CORP
发明人： KAKIZOE HIDEKAZU , NAGAHAMA HIROSHI , ONUKI KAZUO , MIFUKU HIROKI , ITO KIYOHARU
IPC分类号： C21C7/10
摘要： PURPOSE:To efficiently execute the decarburizing treatment with a single blowing of oxygen by using only one piece of top-blowing lance, to efficiently heat molten steel by burning the combustion gas and the oxygen, to prevent the stickiness of metal in a vessel and to sufficiently heat the inner wall from the low temp. condition in the vessel. CONSTITUTION:A tip nozzle part of the top blowing lance 1 arranged by hanging down so as to be possible to ascend/descend is formed to a Laval type and is arranged with an oxygen blowing part composed of a throat part 2 arranged at the axis and a sectional part 3 successively arranged at the lower part of the throat part 2 and a fuel supplying hole 4 arranged on the sectorial surface of the sectorial part 3 and directed to the throat part. By this constitution, at the time of single blowing the oxygen, the supersonic blowing is executed and the contacting efficiency of the oxygen onto the molten steel is improved and further, the stable combustion can be obtd. by efficiently mixing the combustion gas and the oxygen.

6. 发明专利

JPH0741828A METHOD FOR VACUUM-REFINING MOLTEN STEEL 失效
公开(公告)号：JPH0741828A
公开(公告)日：1995-02-10
申请号：JP17569693
申请日：1993-07-15
申请人： NIPPON STEEL CORP
发明人： ONUKI KAZUO , NAGAHAMA HIROSHI , HOSHIJIMA YOSUKE , IGUCHI MASAO , FUKUDA KAZUHISA , MIFUKU HIROKI
IPC分类号： C21C7/072 , C21C7/10
摘要： PURPOSE:To provide a vacuum-refining method for molten steel, by which the sticking of the molten steel in a vacuum-refining apparatus can be prevented and the vacuum treatment can continuously be executed and the molten steel temp. can be compensated. CONSTITUTION:The method for refining molten steel by blowing oxygen- containing gas on the molten steel surface or into the molten steel is characterized by heating the molten steel with a burner while supplying a carbon source into the molten steel under the reduced pressure.

7. 发明专利

JPS6027460A SYNCHRONOUS ROTATION TYPE CONTINUOUS CASTING METHOD 失效
公开(公告)号：JPS6027460A
公开(公告)日：1985-02-12
申请号：JP13518983
申请日：1983-07-26
申请人： NIPPON STEEL CORP
发明人： KIYOUJIMA YOSHIYUKI , NAGAHAMA HIROSHI , ARAMAKI HIROMI
IPC分类号： B22D11/16 , B22D11/06 , B22D11/12 , B22D11/20
摘要： PURPOSE:To produce a billet having stable and high quality by comparing and operating the measured shell thickness value of a continuous casting billet and a set value with a computer and moving an electromagnetic stirrer to the optimum solidifying position of the billet according to the result of the comparison. CONSTITUTION:A molten steel is poured into a casting mold formed of a casting wheel 6 and a belt 9 and the solidified shell formed by the mold is drawn to the outside of the mold in synchronization with the wheel 6 and is straightened by a leading-out knife 13 and straightening rolls 14. The continuous casting billet 1 cooled by coolers 10, 15 are passed through an electromagnetic stirrer 17 and drawing pinch rolls 16 to a movable electromagnetic stirrer 19. The measuring data of a device 20 for measuring the shell thickness is fed to a computer for control and the stirrer 19 is moved to a desired position in the drawing direction of the billet by the signal thereof to suppress the movement of the thickened molten steel toward the central part of the billet 1. The stirrer 17 is preferably provided in the position of about 40-50% solidifying rate of the sectional area and the stirrer 19 in the position of about 60-70%.

8. 发明专利

JP2005226149A Refining agent and method of use thereof 审中-公开
标题翻译：精炼剂及其使用方法
公开(公告)号：JP2005226149A
公开(公告)日：2005-08-25
申请号：JP2004038511
申请日：2004-02-16
申请人： Nippon Steel Corp , Hideaki Suito , 新日本製鐵株式会社 , 英昭水渡
发明人： SASAKI NAOTO , NAGAHAMA HIROSHI , OGAWA YUJI , SUITO HIDEAKI , INOUE AKIRA
IPC分类号： C21C1/02 , C21C5/36
摘要： PROBLEM TO BE SOLVED: To provide a refining agent with which highly efficient treatment with high productivity is actualized using a little quantity of the refining agent by considering a sold phase in slag and the optimization of both solid and liquid phases, and to provide a method of use thereof.
SOLUTION: In the refining agent, each of average compositions of three components of at least CaO, SiO
2 and Fe
t O is adjusted so that a range in which either or both of 2CaO-SiO
2 and CaO exist as the solid phase is obtained at a temperature after refining-treatment.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供一种精炼剂，通过考虑在炉渣中的销售相和固相和液相的优化，使用少量的精制剂实现高生产率的高效处理，以及优化固相和液相提供其使用方法。解决方案：在精炼剂中，调节至少CaO，SiO 2 和Fe O 3的三种组分的平均组成，其中，由于在精炼处理后的温度下获得固相，因此存在2CaO-SiO 2 SB 2和CaO中的任一种或两种。版权所有（C）2005，JPO＆NCIPI

9. 发明专利

JP2004195514A Surface layer reforming device for steel cast slab 有权
公开(公告)号：JP2004195514A
公开(公告)日：2004-07-15
申请号：JP2002367198
申请日：2002-12-18
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： FUJI TAKEHIKO , HARADA HIROSHI , NAGAHAMA HIROSHI , OHASHI WATARU , OHASHI TETSUO
IPC分类号： B22D11/12 , B22D45/00
CPC分类号： B22D11/12
摘要： PROBLEM TO BE SOLVED: To provide a device in which the surface layer of a steel cast slab is reformed by adding an additional element by stably melting the surface layer of the steel cast slab.
SOLUTION: The surface layer reforming device for the steel cast slab is composed of an induction heating coil arranged to go around the steel cast slab, a conductive segment vessel installed inside the coil and having a cooling function, and an additional element feeder. The conductive segment vessel has a clearance. Also, a pair of the conductive segment vessels are arranged in the longitudinal direction of the cast slab.
COPYRIGHT: (C)2004,JPO&NCIPI

10. 发明专利

JP2004195513A Surface layer reforming method for steel cast slab containing copper, reformed cast slab, and processed product 有权
公开(公告)号：JP2004195513A
公开(公告)日：2004-07-15
申请号：JP2002367197
申请日：2002-12-18
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： FUJI TAKEHIKO , HARADA HIROSHI , NAGAHAMA HIROSHI , OHASHI WATARU , OHASHI TETSUO
IPC分类号： B22D11/00 , B22D11/10 , B22D11/12 , B22D11/16 , C23C4/06 , C23C4/14 , C23C26/00
摘要： PROBLEM TO BE SOLVED: To inexpensively and surely reform the surface layer of a steel cast slab containing copper and to prevent the occurrence of cracking during hot working. SOLUTION: The surface layer of the steel cast slab containing copper is melted by either of the induction heating or the plasma heating or by both of them. A pure metal containing nickel or an alloy containing nickel is added to the molten surface layer part of the steel cast slab, Also, a pure metal containing an amount of nickel to satisfy the following formula or an alloy containing the same is added to the molten surface layer part of the steel cast slab. [%Cu]+8×[%Sn] 0[%Sn]≥0, α>0, and [%Cu], [%Sn], and [%Ni] show the mass % of the content of each element in the steel. COPYRIGHT: (C)2004,JPO&NCIPI

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