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

JPH0931526A METHOD FOR CLOSING NOZZLE FOR BLOWING GAS INTO MOLTEN METAL 失效
公开(公告)号：JPH0931526A
公开(公告)日：1997-02-04
申请号：JP17622095
申请日：1995-07-12
申请人： KAWASAKI STEEL CO
发明人： HIRAOKA HISASHI , TAKEUCHI HIDEJI , BESSHO NAGAYASU
IPC分类号： C21C7/072
摘要： PROBLEM TO BE SOLVED: To provide a method for closing a nozzle to allow inexpensive washing with short washing time without an increase in nozzle diameter and without the local occurrence of abnormal erosion at the time of washing a nozzle for blowing gas with gaseous oxygen. SOLUTION: Gas which reacts with the molten metal 7 or induces endothermic reaction by decomposing of itself is passed in the nozzle 5 disposed at the bottom or flank of a vessel for holding the molten metal 7 to form a mushroom at the front end of the nozzle at the point of the end time of the refining operation to blow the gas or a mixture composed of the gas and powder into the molten metal via the nozzle 5. The flow rate of the gas is then gradually lowered until the front end of the nozzle is closed. Gaseous hydrogen, gaseous nitrogen, gaseous ammonia and gaseous hydrogen are advantageously used as the gas for closing the nozzle.

2. 发明专利

JPH07224315A METHOD FOR DENITRIFYING MOLTEN IRON 失效
公开(公告)号：JPH07224315A
公开(公告)日：1995-08-22
申请号：JP31466294
申请日：1994-12-19
申请人： KAWASAKI STEEL CO
发明人： TAKEUCHI HIDEJI , HIRAOKA HISASHI , BESSHO NAGAYASU
IPC分类号： C21C7/00 , C21C7/076 , C21C7/10
摘要： PURPOSE:To efficiently and economically denitrify molten iron by adding a flux consisting of metallic aluminum, calcium oxide, etc., to the molten iron in an atmosphere substantially free from N2 and O2. CONSTITUTION:A flux contg. at least metallic aluminum, aluminum oxide and calcium oxide to be added is dropped by gravity or blown on the surface of molten iron in an atmosphere substantially free from N2 and O2, or the flux is added into the molten iron by the injection method. In this case, the molten iron should be placed under reduced pressure, and the flux is effectively supplied into the molten iron kept under

3. 发明专利

JPH07310112A PREVENTION OF ROCKING OF MOLTEN METAL IN REFINING VESSEL HAVING BOTTOM-BLOWING NOZZLE 失效
公开(公告)号：JPH07310112A
公开(公告)日：1995-11-28
申请号：JP4862195
申请日：1995-03-08
申请人： KAWASAKI STEEL CO
发明人： ABE MASAMICHI , HIRAOKA HISASHI , TAKEUCHI HIDEJI
IPC分类号： C21C5/34
摘要： PURPOSE:To prevent the rocking of molten metal and to improve the refining efficiency by bottom-blowing of stirring gas from plural nozzles at the bottom part of a refining vessel and changing the flow rate and the kind of this gas with mutually different cycles in the every nozzles. CONSTITUTION:The stirring gas is bottom-blown from plural nozzles 2 arranged at the bottom part of a molten steel ladle 1 for refining to execute the refining to the molten steel 3 incorporated therein. In the molten metal refining apparatus, the flow rate and/or the kind of bottom-blowing gas are changed with mutually different cycles in the every nozzles. At this time, the bottom-blowing nozzles 2 arranged so as to be unsymmetrical to the center point of the bottom part of the molten steel ladle 1 or lean to the one side half range of the axes 4, 5 are desirable. Further, adjustment of the cycle change of bottom-blowing gas flow rate in each nozzle is preferably performed by detecting the rocking state of molten steel surface is relation to the change in the bottom-blowing gas flow rate. Further, as one of the bottom-blowing gas, N2 and/or H2 being soluble to the molten steel can be used.

4. 发明专利

JPH01212718A HEAT TREATMENT OF HIGH CHROMIUM WORK ROLL 失效
公开(公告)号：JPH01212718A
公开(公告)日：1989-08-25
申请号：JP13134587
申请日：1987-05-29
申请人： KAWASAKI STEEL CO
发明人： HIRAOKA HISASHI , WATANABE YASUO
IPC分类号： B21B27/00 , C21D5/00 , C22C37/00 , C22C37/08
摘要： PURPOSE:To improve the wear and surface roughening resistances of a high Cr work roll by casting stock for the roll having a prescribed compsn., holding the outer layer at a prescribed temp. in the subsequent cooling stage and carrying out soln. heat treatment. CONSTITUTION:Stock for a high Cr work roll having an outer layer consisting of, by weight, 1-3.2% C, 0.4-1.5% Si, 0.4-1.5% Mn,

5. 发明专利

JPH09166407A DEVICE FOR MEASURING LAYER THICKNESS OF MELTED SLUG AND MEASURING METHOD USING THE DEVICE 失效
公开(公告)号：JPH09166407A
公开(公告)日：1997-06-24
申请号：JP32669495
申请日：1995-12-15
申请人： KAWASAKI STEEL CO
发明人： OKUYAMA GORO , YAMAGUCHI KIMIHARU , HIRAOKA HISASHI
IPC分类号： G01B7/06
摘要： PROBLEM TO BE SOLVED: To very accurately measure the layer thickness of a melted slug. SOLUTION: Electrodes 4a and 4b of a probe 4 are inserted into the layer of a melted slug 3 a non-contact distance meter 5 is instructed to start a measurement at the time point when the electrodes 4a and 4b have passed the layer of the melted slug 3 and the tip has reached the interface between the melted slug 3 and a melted metal 2. The distance to the upper surface of the melted slug 3 is measured by the non-contact distance meter 5 based on the instruction and the layer thickness of the melted slug is calculated from the distance measurement value and the length of the electrodes 4a and 4b which are given previously, thus accurate measuring of the layer thickness of the melted slug is realized.

6. 发明专利

JPH0925509A METHOD FOR MELTING EXTRA-LOW NITROGEN CHROMIUM-CONTAINING STEEL 失效
公开(公告)号：JPH0925509A
公开(公告)日：1997-01-28
申请号：JP17604095
申请日：1995-07-12
申请人： KAWASAKI STEEL CO
发明人： HIRAOKA HISASHI , TAKEUCHI HIDEJI
IPC分类号： C21C7/10
摘要： PROBLEM TO BE SOLVED: To produce an extra-low nitrogen Cr-containing steel in short time and at a low cost by adding Al into molten Cr-containing steel after roughly decarburizing in a reduced-pressure vessel, raising the temp., blowing H2 gas and thereafter, vacuum-decarburizing into an extra-low carbon range. SOLUTION: Aluminum is added into the molten Cr-containing steel in the reduced-pressure vessel after roughly decarburizing, and oxidized into Al2 O3 , and the temp. of the molten steel is raised to a prescribed temp. by this oxidation heat. In this temp. raising stage, H2 gas is blown into the molten steel, desirably at >=2.0Nm /hr of flow rate per molten steel ton. By this method, fine H2 gas bubbles are acted as denitrification reaction site without rising the C concn. at the initial stage to effectively execute the denitrification. Thereafter, the dacarburization is executed to the desired extra-low carbon range by the ordinary vacuum decarburizing treatment. By this method, the decarburizing time is shortened, and the erosion of refractory and the labor can be reduced. Further, the extra-low carbon and extra-low nitrogen steel having

7. 发明专利

JPH0875374A BLOWING METHOD OF GAS OR POWDER FOR REFINING INTO MOLTEN METAL AND HOLDING VESSEL OF THE METAL 失效
公开(公告)号：JPH0875374A
公开(公告)日：1996-03-19
申请号：JP21614994
申请日：1994-09-09
申请人： KAWASAKI STEEL CO
发明人： ABE MASAMICHI , HIRAOKA HISASHI , BESSHO NAGAYASU
IPC分类号： C22B9/05 , C21C7/072 , F27D3/16 , F27D3/18
摘要： PURPOSE: To completely melt with small power by forming a nozzle of conductive heat generating material, heating and melting solidified metal in the nozzle by energizing the material, and then blowing gas or mixture the gas and the powder. CONSTITUTION: Heating electrodes 4, 5 made of conductive heat generating materials are disposed at two positions, the one electrode 4 is installed on the outer periphery of a nozzle 3 of a furnace bottom of a ladle 2, and the other electrode 5 is installed under the nozzle 3. The electrodes 4, 5 are energized to be heated to heat and melt solidified metal 10. In this case, whether the solidified metal 10 in the nozzle 3 is melted or not is judged according to the large or small temperature of a slide gate 7 by using a thermocouple 11 installed at the gate 7. When the melting is confirmed, the opening 9 of the gate 7 is set to the open state of the nozzle 3 to match the nozzle 3, and gas or mixture of the gas and the powder is blown. Thus, it can be completely melted by the small power.

8. 发明专利

JPH06212229A METHOD FOR MELTING IRON SCRAP 失效
公开(公告)号：JPH06212229A
公开(公告)日：1994-08-02
申请号：JP1937393
申请日：1993-01-11
申请人： KAWASAKI STEEL CO
发明人： HIRAOKA HISASHI , TAKEUCHI HIDEJI
IPC分类号： C21B13/00 , F27B1/08
摘要： PURPOSE:To improve a ventilation and productivity in a cupola by using a formed hollow cake or iron core inserted formed coke as the coke used at the time of operating the cupola. CONSTITUTION:At the time of producing molten iron by using the cupola and steel scrap as the main raw material, the steel scrap and lamp coke are alternately fed into the cupola as layer-state, and by blowing the air from a lower tuyere, the steel scrap is melted by combustion heat of the coke to produce the molten iron by carburizing with the coke and the molten iron is tapped off. In this case, by using the formed coke having venting holes penetrating the inner part or the formed coke having the iron core penetrating the coke as the lump coke, the ventilation of coke layer is improved by the venting hole of the coke and the hollow Part by melting and flowing out the iron core. Therefore, the small granules having no ventilation which can not ordinarily be used, can be used as the steel scrap, and high pressure operation can be executed and blending ratio of the steel scrap in a low cost is improved and the molten iron can be produced in good productivity and the low cost.

9. 发明专利

JPH06100920A METHOD FOR DEPHOSPHORIZING AND DESULFURIZING CR-CONTAINING MOLTEN IRON 失效
公开(公告)号：JPH06100920A
公开(公告)日：1994-04-12
申请号：JP25113492
申请日：1992-09-21
申请人： KAWASAKI STEEL CO
发明人： AIDA KIMIHARU , HIRAOKA HISASHI
IPC分类号： C21C1/02
摘要： PURPOSE:To reduce the oxidizing loss of Cr and to efficiently execute de-P and de-S in molten iron by separating an oxygen--containing gas blowing position onto the upper surface of a Cr-containing molten iron at a place keeping a prescribed distance from the tip position of an injection lance for flux. CONSTITUTION:The flux is injected to the molten iron containing >=3% Cr, and also, by blowing the oxygen-containing gas onto the upper surface of the slag, the de-P and the de-S in the molten iron are executed. Then, the blowing position (d) of the oxygen-containing gas is set to (dc) value or more obtd. with the equation dc=0.25H+0.65D (H: distance from the tip part of the oxygen- containing gas blowing lance onto the molten iron surface (m), D: vertical depth below the molten iron surface at the tip part of the flux injection lance (m)) and the tip part position of the flux injection lance is set to the position being apart from the upper surface position of the slag, at whose vertically underposition the tip part is contained. At this positional relation, the oxygen- containing gas is blown onto the upper surface of the slag remained on the molten iron surface.

10. 发明专利

JPH01254363A PRODUCTION OF ROLL FOR ROLLING 失效
公开(公告)号：JPH01254363A
公开(公告)日：1989-10-11
申请号：JP8221588
申请日：1988-04-05
申请人： KAWASAKI STEEL CO
发明人： HIRAOKA HISASHI
IPC分类号： B22D23/00 , B22D13/02 , B22F3/115
摘要： PURPOSE:To improve wear resistance and surface roughening resistance of a roll by injecting molten metal as foggy in inner circumference of casting metallic mold and executing centrifugal casting to outer shell layer of the roll. CONSTITUTION:In the inner circumference of cylindrical mold rotating at high speed, the molten metal for forming the roll outer shell layer is injected as foggy to deposit under semi-melting state. Then, intense centrifugal force is acted to the deposited metal layer, and blow hole between drips of the semi- melting metal is crushed, to fill up the molten metal. As pressure is raised with the centrifugal force, generation of gas at the time of solidification of the molten metal is restrained. By this method, the development of blow hole defect in the outer shell layer of the roll is prevented and the casting structure in the deposited layer is made to fine. Successively, core material is cast in inner part of the outer shell layer to form the roll. As the fine structure having uniform thickness is obtd. and the development of the blow hole defect can be prevented, the wear resistance and the surface roughening resistance of the roll are improved.

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