专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JP2002361384A MANUFACTURING METHOD FOR SEAMLESS STEEL PIPE 审中-公开
公开(公告)号：JP2002361384A
公开(公告)日：2002-12-17
申请号：JP2002040741
申请日：2002-02-18
申请人： KAWASAKI STEEL CO
发明人： ITOYAMA SEIJI , KISHIMOTO YASUO , NISHIGORI MASANORI , TAWARA EIJI , MIYATA YUKIO , OZAKI SEIJI , TOYOOKA TAKAAKI , KIMURA MITSUO
IPC分类号： B22D11/22 , B21B19/04 , B21B19/06 , B22D11/00 , B22D11/124
摘要： PROBLEM TO BE SOLVED: To provide a manufacturing method for a seamless steel pipe excellent in an inner surface and inner quality property. SOLUTION: A round billet, which is formed into a round billet by hot rolling a slab made by continuous casting, and whose segregation parting degree W(%) is 20% or more defined by the formula W(%)=(Δw/D)×100 (where, P: parting degree of segregation (%), Δw: parting width of segregation at the center of round billet thickness (distance between final solidified positions) (mm), D: total thickness (outer diameter) (mm) of round billet)), is used, and heated to the predetermined temperature to form a hollow raw pipe by boring and rolling, then drawn/rolled or further restricted/rolled to form a predetermined sized steel pipe. The slab made by the continuous casting is preferably cast by using a molten steel whose degree of superheat of the molten steel is made to be 25-65 deg.C, the secondary cooling water amount in the central part of the slab width during the casting is made larger compared to the secondary cooling water amount in the vicinity in the direction of the slab width, and the secondary cooling water ratio up to complete solidification is made to be 1.2-2.0 l/kg-steel to obtain the cast slab.

2. 发明专利

JPH08295923A DECARBURIZE-REFINING METHOD 失效
公开(公告)号：JPH08295923A
公开(公告)日：1996-11-12
申请号：JP10507295
申请日：1995-04-28
申请人： KAWASAKI STEEL CO
发明人： WASHIO MASARU , NISHIKAWA HIROSHI , KUGA MASAAKI , NISHIGORI MASANORI , ISHIZUKA HARUHIKO
IPC分类号： C21C7/068 , C21C7/072 , C21C7/10
摘要： PURPOSE: To reduce a stuck quantity of metal to an upper cover without obstructing decarburization by using a pair of top-blowing lance and specifying a factor of oxygen invading depth in each lance at the time of executing a decarburize-refining in a vacuum refining furnace. CONSTITUTION: At the time of executing the decarburize-refining of molten steel in the vacuum refining furnace 1, two pieces of the lance 8 for decarburizing and the lance 9 for secondary combustion as the top-blowing lances are used, and the oxygen is blown so that the factor of oxygen invading depth in one side lance becomes =0.10. Moreover, the factor of oxygen invading depth shows in the equation [wherein, Q is an oxygen flow rate (Nm /min), Pa is the degree of vacuum (Torr), θis an incline angle of lance hole, (n) is the number of lance holes, (d) is a nozzle diameter (mm) and (h) is a lance height (m)]. By this method, the stuck quantity of metal to the upper cover can be reduced.

3. 发明专利

JPH07316630A DETECTION OF END PART OF WIRE IN WIRE ADDING DEVICE AND METHOD FOR CONTROLLING DRIVE 失效
公开(公告)号：JPH07316630A
公开(公告)日：1995-12-05
申请号：JP11552394
申请日：1994-05-27
申请人： KAWASAKI STEEL CO
发明人： AIZAWA KANJI , NABESHIMA YUKI , ITO HITOSHI , NISHIGORI MASANORI , YOSHIDA TAKAYUKI
IPC分类号： C21C7/04
摘要： PURPOSE:To provide a detecting method of the end part of a wire having high reliability at a low cost, at the time of adding a coil-state wire into molten metal, and a drive control method for a wire adding device. CONSTITUTION:In a wire adding device for adding a component adjusting element and a refining agent into the molten metal, the wire 1 wound in the coil- state is drawn out with pinch rolls 2 in order and fed into the molten metal through a guide pipe 3. At this time, the neighborhood 13 of the end part of the coil-state wire 1 is beforehand interposed between electric conduction measuring electrodes 12a, 12b to detect the electrical variation. Further, the drive control method for the wire adding device for stopping the rotation of the pinch rolls 2 with the signal is provided.

4. 发明专利

JPH06346131A VACUUM-DEGASSING AND DECARBURIZING OF MOLTEN STAINLESS STEEL 失效
公开(公告)号：JPH06346131A
公开(公告)日：1994-12-20
申请号：JP14082493
申请日：1993-06-11
申请人： KAWASAKI STEEL CO
发明人： NISHIKAWA HIROSHI , NISHIGORI MASANORI
IPC分类号： C21C7/10
摘要： PURPOSE:To restrain the oxidation of Cr and the temp. drop of molten steel and to promote the dacarburization by adjusting [%N]/[%Cr] of the molten steel before starting treatment to a specific value and blowing oxidizing gas on the molten steel surface in a specific condition at the time of executing the treatment. CONSTITUTION:At the time of vacuum-degassing and decarburizing of molten stainless steel melted in a steelmaking furnace, while foaming the molten steel before starting the treatment in the vacuum vessel, the oxidizing gas is blown to adjust the [%N]/[%Cr] of the molten steel to >=3.0X10- . Successively, at the time of executing the treatment, the oxidizing gas is blown to the molten steel surface in the vacuum- degassing treating vessel through a top-blowing lance so that alpha defined with the equation becomes 1-4. In the equation, LH is the height from the static molten steel surface in the vacuum-degassingtreating vessel to the tip part of the top blowing lance (m), PV is the vacuum degree in the vacuum-degassing treating vessel after supplying the oxidizing gas (Torr), Ss, the area of nozzle throat part in the top blowing lance (mm ), So, the area of nozzle discharging part in the top blowing lance (mm ), Q, the flow rate of oxygen (Nm /min).

5. 发明专利

JPH06116625A METHOD FOR DEGASSING AND DECARBURIZING MOLTEN STAINLESS STEEL 失效
公开(公告)号：JPH06116625A
公开(公告)日：1994-04-26
申请号：JP26865392
申请日：1992-10-07
申请人： KAWASAKI STEEL CO
发明人： NISHIKAWA HIROSHI , NISHIGORI MASANORI , OSUGI HITOSHI
IPC分类号： C21C7/10 , C21C20060101
摘要： PURPOSE:To promote decarburizing reaction and to profitably prevent the oxidation of Cr and the lowering of temp. by injecting the oxidizing gas on the surface of molten stainless steel controlled in C+N in a specific condition under vacuum. CONSTITUTION:The molten stainless steel smelted in a steel-making furnace is subjected to vacuum degassing and decarburizing treatment in a vacuum degassing treating vessel. Then, C+N in the molten steel before the treatment is controlled at >=0.14wt.%. Further, on the molten steel surface in the treating vessel, the oxidizing gas is injected in the range of 1-4 of alpha defined with the equation alpha=-0.808(LH) +0.00191(PV)+0.00388(D2/D1) Q+2.97 (wherein, LH is height from the static surface of the molten steel to the tip part of a top- blowing lance in the vacuum degassing treating vessel (m), PV is vacuum degree in the vessel after supplying the oxidizing gas (Torr), D1 is nozzle throat diameter of the top-blowing lance (mm), D2 is nozzle opening diameter of the top- blowing lance (mm)).

6. 发明专利

JP2000219907A METHOD FOR OPENING POURING NOZZLE AND DEVICE THEREFOR 失效
公开(公告)号：JP2000219907A
公开(公告)日：2000-08-08
申请号：JP2203199
申请日：1999-01-29
申请人： KAWASAKI STEEL CO
发明人： NISHIGORI MASANORI , OSUGI HITOSHI , TATENO SHIGEO
IPC分类号： B22D41/44 , C21C5/46
摘要： PROBLEM TO BE SOLVED: To start the supplying of molten steel by simply and quickly opening a hole in the case of non-opening the hole of a pouring nozzle. SOLUTION: When the supply of a molten steel is started into a vessel arranged at a lower part by disposing a filling material for plugging flowing path in the flowing path of a pouring nozzle 2 disposed at a bottom part of a steel receiving vessel 1 or the range from the flowing path to the bottom part of the steel receiving vessel and then, discharging the filling material, in the case of non-opening the hole of the nozzle causing to be impossible to supply the molten steel by forming the sintered layer of the filling material, a gas blowing tube 5 is inserted through an opening/closing door of a seal member 4 for holding the range from the pouring nozzle to a vessel disposed at the lower part of the steel receiving vessel in the inert gas atmosphere. Then, O2 gas is blown into the flowing path of the pouring nozzle from this gas blowing tube to fuse the sintered layer.

7. 发明专利

JPH11217616A METHOD FOR DESILICONIZING AND DEPHOSPHORIZING MOLTEN IRON 失效
公开(公告)号：JPH11217616A
公开(公告)日：1999-08-10
申请号：JP1704698
申请日：1998-01-29
申请人： KAWASAKI STEEL CO
发明人： TAWARA EIJI , NISHIGORI MASANORI , NISHIKAWA HIROSHI , KISHIMOTO YASUO
IPC分类号： C21C1/04
摘要： PROBLEM TO BE SOLVED: To provide a desiliconizing and dephosphorizing method of molten iron winch can improve the reaction efficiency of top-blown oxygen added from the upper part of the molten iron surface and also, can reduce the wear of refractory in a torpedo car and further, effective in reducing the consumption unit of flux. SOLUTION: In a method for executing the desiliconization and the dephosphorization of molten iron by injecting an oxidizer and refining flux into the molten iron in a torpedo car with an injection lance using geseous oxygen and/or nitrogen as a carrier gas, in only a desiliconizing period progressed prior to the dephosphorization, the supply of the oxygen is executed from the upper part of the molten iron through a top-blown lance separately provided, simultaneously, in this desiliconizing period, the injection from the injection lance is executed only with the oxidizer and in a mainly deposphorizing treatment period after completing the desiliconizing treatment, the injection of the refining flux is concentrated executed.

8. 发明专利

JPH07331323A METHOD FOR CONDUCTING HEAT INTO MOLTEN STEEL AT THE TIME OF EXECUTING VOD TREATMENT 失效
公开(公告)号：JPH07331323A
公开(公告)日：1995-12-19
申请号：JP12353494
申请日：1994-06-06
申请人： KAWASAKI STEEL CO
发明人： ASAHO RYUICHI , TAOKA KEIZO , NABESHIMA YUKI , NISHIGORI MASANORI
IPC分类号： C21C7/10
摘要： PURPOSE:To efficiently conduct the heat to molten steel and to prevent the lowering of temp. of the molten steel during refining by blowing and burning combustible gas from out of a system of a VOD vacuum vessel into a VOD ladle while executing the secondary refining to molten crude stainless steel by using the VOD equipment. CONSTITUTION:A lance 10 for blowing the combustible gas which can blow CO gas, etc., into the ladle 2 from out of the system at the time of executing the VOD treatment is arranged on the upper cover of the vacuum vessel 1 of the VOD equipment. The combustible gas is blown into the VOD ladle 2 by using the lance during the VOD treatment and at the same time, the excess oxygen gas used at the time of executing the decarburizing treatment to forcedly progress the exothermic reaction of the combustible gas. The generated heat is conducted to the molten crude stainless steel 6 in the VOD ladle 2 to mitigate the lowering of the temp. As the blowing combustible gas, it is desirable to use CO gas of a blast furnace-recovered gas, converter-recovered gas and coke oven-recovered gas, etc.

9. 发明专利

JPH0610024A METHOD FOR REFINING ULTRALOW CARBON AND ULTRALOW SULFUR CHROMIUM-CONTAINING MOLTEN STEEL 失效
公开(公告)号：JPH0610024A
公开(公告)日：1994-01-18
申请号：JP16965192
申请日：1992-06-26
申请人： KAWASAKI STEEL CO
发明人： NISHIGORI MASANORI , NISHIKAWA HIROSHI
IPC分类号： C21C7/00 , C21C7/064 , C21C7/076 , C21C7/10
摘要： PURPOSE:To easily obtain an ultralow carbon and ultralow sulfur chromium- containing molten steel without lowering the workability with a VOD by executing decarburization with SiO2-less slag in a refining using the VOD and using reducing and deoxidizing agent except Si under reduced pressure. CONSTITUTION:[%C] is decarburized to 0.20-0.40% in a rough decarburizing furnace and Cr oxide produced in the carburization is reduced and recovered by using FeSi, and [%Si] in the molten steel is adjusted to

10. 发明专利

JPH04224617A PRODUCTION OF STAINLESS STEEL BY CR ORE SMELTING REDUCTION 失效
公开(公告)号：JPH04224617A
公开(公告)日：1992-08-13
申请号：JP40698290
申请日：1990-12-26
申请人： KAWASAKI STEEL CO
发明人： NISHIGORI MASANORI , TADA MUTSUMI , NISHIKAWA HIROSHI , ASAHO RYUICHI
IPC分类号： C21C1/02 , C21C7/068
摘要： PURPOSE:To produce a stainless steel having the prescribed Cr content at the prescribed timing without using expensive ferro-chromium alloy by using two sets of refining furnaces having top-bottom combined blowing function, executing smelting reduction to Cr ore in one side of the furnace and executing decarbonizing and finish-refining to the molten raw metal obtd. in the other side of furnace in the process for producing the stainless steel. CONSTITUTION:The molten raw metal obtd, by the smelting reduction of Cr ore is once stored in a molten metal storing vessel of mixing furnace or torpedo ladle car, etc., and by suitably discharging this into the decarbonizing and finish- refining furnace if need, the reduction of Cr ore in the smelting reduction furnace is sufficiently executed, and the molten raw metal having stable composition can be supplied into the decarbonizing and finish-refining furnace at the desired timing.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式