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41. 发明专利

JPH10195520A THOROUGH CLEANING METHOD OF AL-CONTAINING STAINLESS STEEL 失效
公开(公告)号：JPH10195520A
公开(公告)日：1998-07-28
申请号：JP196797
申请日：1997-01-09
申请人： KAWASAKI STEEL CO
发明人： OKUYAMA GORO , TAKEUCHI HIDEJI , BESSHO NAGAYASU , HIROTA AKIHITO , NOMURA HIROSHI
IPC分类号： C21C7/04 , C21C7/06 , C21C7/076
摘要： PROBLEM TO BE SOLVED: To provide a thorough cleaning method of an Al-containing stainless steel which make harmless non-metallic inclusion harmless more strongly than that in the conventional method. SOLUTION: At the time of deoxidizing and reducing by adding Al into the molten stainless steel under existence of CaO-SiO2 -Al2 O3 -MgO base molten slag consisting essentially of 5-20wt.% MgO and >20wt.% Al2 O3 , the reduction of MgO in the molten slag is restrained and the basicity CaO/SiO2 of the slag is made to

42. 发明专利

JPH10156505A METHOD FOR OSCILLATING MOLD FOR VERTICAL TYPE CONTINUOUS CASTING 失效
公开(公告)号：JPH10156505A
公开(公告)日：1998-06-16
申请号：JP31338096
申请日：1996-11-25
申请人： KAWASAKI STEEL CO
发明人： ITOYAMA SEIJI , MOCHIDA TETSUO , BESSHO NAGAYASU , KUROKAWA KATSUMI , TOZAWA KOICHI
IPC分类号： B22D11/16
摘要： PROBLEM TO BE SOLVED: To prevent the surface crack in the longitudinal direction on the long side surface at the time of applying a horizontal oscillation casting method. SOLUTION: At the time of executing a vertical oscillation of a mold for a vertical type continuous casting, forming a casting space with two pairs of the casting surfaces and also, a horizontal oscillation of one pair of the molding surface advancing/retreating to the solidified shell in the horizontal direction at the same period as the vertical oscillation period, the product of the number of oscillation and amplitude of the horizontal oscillation is controlled to a critical value or lower decided with cast metal and casting condition. Further, the critical value is desirable to use a value obtd. in pre-experiment.

43. 发明专利

JPH09176724A METHOD FOR VACUUM-DECARBURIZING MOLTEN STEEL 失效
公开(公告)号：JPH09176724A
公开(公告)日：1997-07-08
申请号：JP33466995
申请日：1995-12-22
申请人： KAWASAKI STEEL CO
发明人： ABE MASAMICHI , HIRAOKA HISASHI , BESSHO NAGAYASU
IPC分类号： C21C7/068 , C21C7/10
摘要： PROBLEM TO BE SOLVED: To execute decarburizing-refining of molten steel without developing splash by blowing inert gas from the bottom part of a ladle incorporating the molten steel under vacuum atmosphere forming a recessed surface having a specific depth on the surface of the molten steel and blowing gaseous oxygen onto the surface. SOLUTION: The molten steel 3 is changed into the ladle 2 provided with bottom-blown plugs 4 and a top-blown lance 1 under the vacuum atmosphere and the inert gas of Ar, etc., is blown from the bottom-blown plugs 4 to stir the molten steel 3. The oxygen is blown from the top-blown lance 1 and carbon in the molten steel is burnt to execute the decarburizing-refining of the molten steel. At this time, the shape of a naked molten steel surface, on which slag does not exist, is formed to the recessed surface state having 10-50mm depth by using plural pieces of the bottom-brown plugs 4. The gaseous oxygen is jetted on the naked molten steel surface having the recessed surface state from the top-blown lance 1. The development of the splash is little by interfering the top-blown oxygen jet and the bottom-blown inert gas and the decarburizing refining of the molten steel 3 is executed in excellent decarburizing oxygen efficiency.

44. 发明专利

JPH09164455A METHOD FOR REMOVING NON-METALLIC INCLUSION IN MOLTEN METAL 失效
公开(公告)号：JPH09164455A
公开(公告)日：1997-06-24
申请号：JP32701495
申请日：1995-12-15
申请人： KAWASAKI STEEL CO
发明人： SAKAI SHIGEO , MIKI YUJI , BESSHO NAGAYASU , NARA MASAKATSU
IPC分类号： B22D11/10 , B22D11/11 , B22D11/112 , B22D11/116 , B22D11/117 , B22D43/00 , C21C7/00
摘要： PROBLEM TO BE SOLVED: To reduce non-metallic inclusion in molten metal and also, the erosion of a porous plug in a gas injecting part. SOLUTION: In an intermediate holding vessel having the pouring-in and the pouring-out functions of the molten metal, the pouring-in of the molten metal is executed from the upper part of the intermediate holding vessel through a pouring nozzle 2. Further, gas injecting holes are arranged on the circular periphery with the bottom part of the intermediate holding vessel just below the pouring nozzle 2 as a center. Gas is injected from the gas injecting holes toward the center direction of the circle, and the molten metal ascending flow by this gas injection and the molten metal descending flow by the pouring-in are collided.

45. 发明专利

JPH0978120A METHOD FOR PREVENTING ABSORPTION OF NITROGEN INTO MOLTEN STEEL FOR AN EXTRA-LOW NITROGEN CHROME-CONTAINING STEEL 失效
公开(公告)号：JPH0978120A
公开(公告)日：1997-03-25
申请号：JP24174795
申请日：1995-09-20
申请人： KAWASAKI STEEL CO
发明人： HIRAOKA HISASHI , BESSHO NAGAYASU
IPC分类号： C21C7/00 , C21C7/04
摘要： PROBLEM TO BE SOLVED: To prevent the absorption of nitrogen at the time of tapping molten steel for an extra-low nitrogen Cr-containing steel decarbirize-refined in a converter, etc., and in a ladle. SOLUTION: In a process for tapping the molten steel for the extra-low nitrogen Cr-containing steel decarburize-refined in the converter, etc., and pouring into the ladle and transporting, one or more kinds among CaCO3 , MgCO3 or compounds thereof are added into the molten steel and this addition is executed by charging into molten steel tapping flow and/or by beforehand laying in the ladle. Further, as necessary, this additive is additionarily added into the molten steel during transporting, and it is desirable to add 0.07Nm / t-steel.min as CO2 generated quantity in the total added quantity of CaCO3 and MgCO3 .

46. 发明专利

JPH0961058A METHOD FOR OPERATING VERTICAL SCRAP MELTING FURNACE 失效
公开(公告)号：JPH0961058A
公开(公告)日：1997-03-07
申请号：JP21620595
申请日：1995-08-24
申请人： KAWASAKI STEEL CO
发明人： IIJIMA HIROMASA , TAKEUCHI HIDEJI , BESSHO NAGAYASU
IPC分类号： C21B11/02 , F27B1/16
摘要： PROBLEM TO BE SOLVED: To prevent a shelf hanging in a vertical scrap melting furnace and improve an energy holding efficiency of coal material. SOLUTION: Either one of coal material 3 and iron source 2 is placed at a central part of a vertical scrap melting furnace and the other at a furnace wall side and loaded into the vertical scrap melting furnace, air is blown into the furnace at tuyere 4, and concurrently tuyeres 12, 13 opened at an iron source layer region and a blowing position of a lance 9 which can be moved up and down are adjusted in a vertical direction, a secondary combustion is promoted and then generated CO is completely ignited up to CO2 .

47. 发明专利

JPH0941013A OPERATION OF VERTICAL TYPE SCRAP MELTING FURNACE 失效
公开(公告)号：JPH0941013A
公开(公告)日：1997-02-10
申请号：JP19198195
申请日：1995-07-27
申请人： KAWASAKI STEEL CO
发明人： TAKEUCHI HIDEJI , TAKAHASHI YUKIO , BESSHO NAGAYASU
IPC分类号： C21B11/02 , F27B1/20
摘要： PROBLEM TO BE SOLVED: To execute a stable scrap melting operation having low unit requirement of carbonaceous material without hanging by using a vertical type scrap melting furnace. SOLUTION: The carbonaceous material 11 for melting and carburizing is charged at 50-80% into the center part in a horizontal cross section of the melting furnace 1 and the remained carbonaceous material is charged into the part contacting with the inner wall of the melting furnace 1 to operate the vertical type scrap melting furnace.

48. 发明专利

JPH08333666A PRODUCTION OF HOT-DIP METAL PLATED STEEL SHEET 失效
公开(公告)号：JPH08333666A
公开(公告)日：1996-12-17
申请号：JP13789395
申请日：1995-06-05
申请人： KAWASAKI STEEL CO
发明人： KATO CHIAKI , MOCHIZUKI KAZUO , BESSHO NAGAYASU , UNNO SHIGERU , AKAOKA KAZUO
IPC分类号： C23C2/06
摘要： PURPOSE: To efficiently produce a galvanized steel sheet and an alloyed galvannealed steel sheet with tight adhesion. CONSTITUTION: A galvanizing bath having 0.1 to 1.0wt.% Al concn., and the balance Zn with inevitable impurities is used. For 0.2 to 2sec immediately after the impregnation of a steel sheet into a plating bath, a magnetic field with magnetic flux density (T) satisfying the inequality, T>3.61×10 /[Al]+1.39×10 (where [Al] denotes the concn. wt.% of the dissolved Al) is vertically applied to the face of the steel sheet to produce the hot-dip metal plated steel sheet.

49. 发明专利

JPH08229653A METHOD FOR CONTINUOUSLY CASTING STEEL 失效
公开(公告)号：JPH08229653A
公开(公告)日：1996-09-10
申请号：JP3981095
申请日：1995-02-28
申请人： KAWASAKI STEEL CO
发明人： IDOKAWA SATOSHI , NARA MASAKATSU , BESSHO NAGAYASU , FUJII TETSUYA
IPC分类号： B22D11/04 , B22D11/10 , B22D11/115
摘要： PURPOSE: To extremely reduce the entrapment of inclusion and gas bubble, etc., caused by molten steel spouted flow by arranging an AC superconducting magnet to the back surface of a mold, impressing shifting magnetic field and executing the flowing control of molten steel. CONSTITUTION: The molten steel M is poured into the mold 2 from an immersion nozzle 3. The AC superconducting magnet 1 is arranged to the back surface of the mold 2 to execute the flowing control of molten steel M. Since the electro-magnet is made to use the superconducting magnet 1, the intensity of the magnetic field can drastically be improved. The electromagnetic force F generated by impressing the shifting magnetic field is F= σ.B .τ.f, and wherein, σis electric conductivity of the molten steel, B is magnetic flux density, τ is the pitch of poles and (f) is the frequency of advancing magnetic field. When the magnetic flux density B becomes 10 times, the electro-magnetic force F becomes 100 times. Since the damping of the magnetic field is developed through the mold 2, the frequency (f) of an electric source is made to be 1-10Hz. The intensive electromagnetic force F can be acted to the spouted flow of the molten steel M from the immersion nozzle 3. A cast slab having good quality can stably be supplied.

50. 发明专利

JPH08229651A APPARATUS FOR CONTINUOUSLY CASTING STEEL AND METHOD THEREOF 失效
公开(公告)号：JPH08229651A
公开(公告)日：1996-09-10
申请号：JP3981595
申请日：1995-02-28
申请人： KAWASAKI STEEL CO
发明人： BESSHO NAGAYASU , NARA MASAKATSU , IDOKAWA SATOSHI , FUJII TETSUYA
IPC分类号： B22D11/04 , B22D11/10 , B22D11/115
摘要： PURPOSE: To increase the number of oscillations in the oscillation of a mold and to reduce the depth of an oscillation mark by using an air-core coil in an electro-magnet for executing the flowing control of molten steel in a mold and lightening. CONSTITUTION: Water-cooling copper plates 1 are supported with backup plates 2 to form long wall members of the mold. The molten steel 5 is supplied from an immersion nozzle 4. The molten steel 5 is prevented from the oxidation with powder 6 and cooled with the water-cooling copper plates 1 in the lubricating condition. Simultaneously, the mold is oscillated through an oscillation table, and solidified shell 7 is continuously formed and also, grown to obtain a continuously cast slab. The electro-magnets 8a arranged at the backs of the backup plates 2 control the flowing of molten steel in the mold. The electro- magnet 8a is constituted with the coil 9a which does not use an iron core but forms with a copper-made wire. The wt. of the electro-magnet 8a becomes 1/5 of the conventional magnet by using the air-core type. Superconducting coil 9a is desirable to be used to the electro-magnet 8a in order to obtain the sufficient magnetic flux density.

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