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1. 发明专利

JPH11239847A INGOT-MAKING APPARATUS FOR MOLTEN METAL 失效
公开(公告)号：JPH11239847A
公开(公告)日：1999-09-07
申请号：JP4238598
申请日：1998-02-24
申请人： DAIDO STEEL CO LTD
发明人： KOBAYASHI KATSUTOSHI , MIZUGUCHI KEIICHI , MORITA HIROTAKA
IPC分类号： B22D7/12 , B22D9/00
摘要： PROBLEM TO BE SOLVED: To provide an ingot-making apparatus for molten metal, by which vacuum induction melting can be executed in high vacuum degree and the defective inclusion and the deterioration of the ingot surface state are not brought into. SOLUTION: Relating to this ingot-making apparatus of the molten steel, a melting chamber containing a vacuum induction melting furnace 2 and a casting camber 9 containing a molten steel pouring tube 3 and a casting base board 5 provided with a mold 4 are connected with a passage 10 provided with a passage shut-off mechanism 11 and in this passage, a launder 12 reciprocatively movable between the melting chamber 8 and the casting chamber 9 is disposed, a ladle 13 which opens at the upper part, and has a molten steel pouring hole 13a at the bottom part and closes this molten steel pouring hole 13a with a stopper rod 15 vertically movable, is interposed between the launder 12 and the molten steel pouring tube 3.

2. 发明专利

JPH11197796A INGOT-MAKING APPARATUS FOR MOLTEN STEEL 失效
公开(公告)号：JPH11197796A
公开(公告)日：1999-07-27
申请号：JP316698
申请日：1998-01-09
申请人： DAIDO STEEL CO LTD
发明人： KOBAYASHI KATSUTOSHI , MIZUGUCHI KEIICHI , MORITA HIROTAKA
IPC分类号： B22D39/04 , B22D7/00 , B22D7/06 , B22D41/20
摘要： PROBLEM TO BE SOLVED: To provide an ingot-making apparatus, in which inclusion defective in the obtd. steel ingot is reduced and the surface condition of the steel ingot is improved and further, the development of a pipe-shaped defect is restrained. SOLUTION: A casting steel plate 3 provided with a mold 5 and a molten steel pouring tube 4 is laid on a frame base 2 through load cells 9 in a vacuum chamber 1. A vessel 10 which has an opening part at the upper part and a molten steel flowing-out hole 10b at the bottom part is arranged above the molten steel pouring tube 4, and the molten steel flowing-out hole 10b is closed with a vertically movable stopper rod 11. A tiltable vacuum induction melting furnace 7 for pouring the molten steel 8 into the vessel 10 is arranged near the upper opening part 10a of the vessel 10.

3. 发明专利

JPH0617145A IMPROVEMENT OF DESCALING PROPERTY OF HEAT-TREATED STEEL MATERIAL 失效
公开(公告)号：JPH0617145A
公开(公告)日：1994-01-25
申请号：JP22930692
申请日：1992-08-04
申请人： DAIDO STEEL CO LTD
发明人： HIROSE SHUJI , IKEI FUMIO , MIZUGUCHI KEIICHI
IPC分类号： B21B45/00 , B21B45/02 , C21D9/52
摘要： PURPOSE:To easily remove scale on the surface of heat-treated steel material by starting cooling in a specific temp. range after executing the heat treatment of the hot-rolled steel material and rapidly cooling in the transformation temp. range of the wustite generation on the interface of iron matrix. CONSTITUTION:The hot-rolled steel material or the drawn steel material is heat-treated. The cooling is started for the heat treated steel material at the temp. or lower where the temp. near the surface caused no oxidative decarburization, and in the range of the temp. where no magnetite is generated in the interface of the iron matrix in the steel material. The steel material starting the cooling is rapidly cooled at least in the transformation temp. range of the wustite generated on the interface of the iron matrix. The scale stuck to the surface of the steel material starting the cooling and rapidly cooled, has the wustite on the interface of the iron matrix. On the surface of this wustite, the magnetite caused by oxidizing thereof is deposited and many deep cracks reaching the wustite on the interface of the iron matrix are generated. This scale can easily be removed by pickling and mechanical peeling.

4. 发明专利

JPS61204078A DETOXICATING TREATMENT FOR DEPHOSPHORIZATION SLAG 失效
公开(公告)号：JPS61204078A
公开(公告)日：1986-09-10
申请号：JP4615985
申请日：1985-03-08
申请人： DAIDO STEEL CO LTD
发明人： MIZUGUCHI KEIICHI , INAGAKI YOSHIO
IPC分类号： B09B3/00
摘要： PURPOSE:To treat safely and surely the carbide slag used for the dephosphorization of a molten steel so that said slag is made harmless by mixing the slag with slag having low basicity in a molten state, adding iron oxide thereto and blowing an oxygen-contg. gas to the mixture thereby stirring the slag. CONSTITUTION:The carbide slag used for the dephosphorization of the molten steel is mixed in the molten state with the slag of the low basicity used in arc furnace steel making and the iron oxide such as scale generated in a working stage is added thereto, then the oxygen-contg. gas is blown thereto to stir the slag, by which the phosphorus existing in the carbide slag is converted to a phosphoric acid. More specifically, the carbide slag of the dephosphorization can be treated to be made harmless without increasing the consumption. The treatment is executed by making use of the slag and scale produced in the stage for steel making, etc. in the more preferable embodiment and therefore the effective utilization of waste is made possible. Since the heat inertia of the slag having the low m.p. and viscosity is utilized, there is no energy consumption and the approximately thorough oxidation of phosphorus is executed in a short period of time. The sure detoxicating treatment is thus made possible.

5. 发明专利

JP2000146457A VACUUM INDUCTION FURNACE FACILITY 失效
公开(公告)号：JP2000146457A
公开(公告)日：2000-05-26
申请号：JP32188398
申请日：1998-11-12
申请人： DAIDO STEEL CO LTD
发明人： KOBAYASHI KATSUTOSHI , MIZUGUCHI KEIICHI , MORITA HIROTAKA
IPC分类号： F27D7/06 , F27D11/06
摘要： PROBLEM TO BE SOLVED: To provide an induction furnace facility, or a vacuum induction furnace facility which is capable of achieving the connection work for the power supply and water feed to a furnace body and a furnace body facility in a short time, and dispensing with workers for the connection work. SOLUTION: In a vacuum induction furnace facility which comprises a furnace body facility 2 with a furnace body 3 and a chamber 4 placed on a plurality of movable trucks 7 integrated with each other, an upper lid of the furnace body which is not placed on the trucks 7, a casting device and an evacuation device and is capable of alternately using a plurality of furnace bodies 2, a power reception device 17 of a power receiving facility capable of achieving the quick automatic connection, a power supply port 10 connected to the power reception device 17 and the furnace body facility 2, one joint of a quick automatic pipe joint for water passage and a water feed port 13 connected to one joint 20 and the furnace body facility 2 are installed on the same truck as the truck 7 with each furnace body facility 2 placed thereon, and a power supply facility to be quickly connected to the power reception device and the other joint of the quick automatic pipe joint are installed outside the truck.

6. 发明专利

JPS63145709A METHOD AND APPARATUS FOR REFINING OF STEEL 失效
公开(公告)号：JPS63145709A
公开(公告)日：1988-06-17
申请号：JP29259386
申请日：1986-12-10
申请人： DAIDO STEEL CO LTD
发明人： SUGIURA SABURO , NAKADA HIROYA , OKAMOTO TETSUO , INAGAKI YOSHIO , MIZUGUCHI KEIICHI , ISHII ATSUSHI
IPC分类号： C21C7/068 , C21C5/28
摘要： PURPOSE:To shorten decarbonizing time, to reduce oxidation loss of available metal and additional quantity of reducing agent for the above metal re-reduction and to shorten reduction time, by executing the refining while executing transfer and supply of heat to the molten steel surface which the heat receiving area is enlarged by the forced stirring with combustion burner. CONSTITUTION:By blowing O2 gas and Ar gas at the same time to molten steel 1 in a furnace 2 by a tuyere 4, the molten steel 1 is forcedly stirred. Injecting flame 7 to the molten steel surface from the combustion burner 6 supplying fuel source, such as heavy oil, fine powdery coal, natural gas, etc., and O2 source is aimed to enlarge the heat receiving area, to raise the molten steel 1 temp., to compensate the necessary heat during refining, to reduce C content at initial period and to shorten the decarbonized time. By restraining oxidation of the available metal such as Cr, etc., the necessary Si quantity for the reduction of the above metal is reduced, generated slag quantity is reduced, slag-off time is shortened and unit consumption of energy is improved.

7. 发明专利

JPS62247017A SIDE-BLOWN SMELTING VESSEL 失效
公开(公告)号：JPS62247017A
公开(公告)日：1987-10-28
申请号：JP8970686
申请日：1986-04-18
申请人： DAIDO STEEL CO LTD
发明人： MIZUGUCHI KEIICHI
IPC分类号： C21C5/44 , C21C5/48
摘要： PURPOSE:To considerably extend the life of refractory bricks near tuyeres while maintaining the inside volume of a smelting vessel as it is by projecting the sheath shell near the tuyeres of the vessel to the outside and increasing the thickness of the refractory bricks near the tuyeres. CONSTITUTION:The sheath shell 1 near the tuyeres 3 in the inverted circular truncated cone part provided with the tuyeres 3 of the vessel forms the projecting part 5 which projects to the part of a cylindrical belly part 4 in the upper part of the tuyeres. The refractory bricks 2 are lined to the inside of the projecting part 5 of the shell 1. The refractory bricks 2 lined to the projecting part 5 can be, therefore, increased in thickness by as much as the shell 1 projects. As a result, the operation can be continued without the need for replacing the bricks even if the surface part of the refractory bricks 2 is slightly worn by a molten metal at the time of the smelting operation.

8. 发明专利

JP2512919B2 失效
公开(公告)号：JP2512919B2
公开(公告)日：1996-07-03
申请号：JP29259386
申请日：1986-12-10
申请人： DAIDO STEEL CO LTD
发明人： SUGIURA SABURO , NAKADA HIROYA , OKAMOTO TETSUO , INAGAKI YOSHIO , MIZUGUCHI KEIICHI , ISHII ATSUSHI
IPC分类号： C21C7/068 , C21C5/28

9. 发明专利

JPH0673437A METHOD FOR UNIFORMIZING CARBIDE GRAIN IN SPHEROIDIZING ANNEALING OF HIGH CARBON CHROMIUM BEARING STEEL WIRE ROD 失效
公开(公告)号：JPH0673437A
公开(公告)日：1994-03-15
申请号：JP12560492
申请日：1992-04-17
申请人： DAIDO STEEL CO LTD
发明人： MIZUGUCHI KEIICHI , ISHIHAMA KATSUNORI
IPC分类号： C21D1/32 , C21D6/00
摘要： PURPOSE:To shorten working time for a bearing steel, to reduce the unevenness of the working time, to reduce the difference between the temp. history at the inner part and that at the outer part of a wire rod coil by preventing the coarsening and the unevenness of carbide in the spheroidizing annealing of a high carbon chromium bearing steel wire rod. CONSTITUTION:In the spheroidizing annealing by heating the wire rod coil of the high carbon chromium bearing steel to a prescribed temp. higher than transformation temp. (AC1) and slowly cooling after soaking, a heat treatment furnace prepared so as to be possible to use for heating by convection and provided with a stirring fan 18 is used and the heating operation is executed while flowing from the inner part to the outer part of the wire rod coil 20 by forced convection of the atmosphere in the furnace. Further, the carbide in made fine and uniformly distributed so that the heating velocity in the temp. range of the transformation temp. (AC1)+ or -50 deg.C becomes >=70 deg.C/hr.

10. 发明专利

JPS6363554A MOLTEN METAL POURING DEVICE 失效
公开(公告)号：JPS6363554A
公开(公告)日：1988-03-19
申请号：JP20997486
申请日：1986-09-05
申请人： DAIDO STEEL CO LTD
发明人： MIZUGUCHI KEIICHI , NAKADA HIROYA , YAJIMA TADAMASA , OMA HIDEYUKI
IPC分类号： B22D7/12
摘要： PURPOSE:To prevent the development of boiling in a mold caused by the air contamination and the enclosure of the air into the molten metal by shutting out the outside air by surrounding a molten metal flowing passage between a molten metal vessel and pouring tube by a fibrous forming body having heat resistance. CONSTITUTION:The fibrous forming body 7 is arranged at a gap between the bottom part of molten metal vessel 1 and the upper end of pouring tube 5, and the molten metal flowing passage formed at the gap between the molten metal vessel 1 and pouring tube 5 is surrounded by the fibrous forming body 7 to shut off the outside air. In this way, the oxidation caused by bringing the molten metal 3 into contact with the air is prevented, and also the development of boiling in the ingot making mold caused by enclosure of the air is prevented and the ingot having excellent quality is obtd.

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