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1. 发明专利

JPH09111430A METHOD FOR REGENERATING HOT DIP METAL COATING BATH AND EQUIPMENT THEREFOR 失效
公开(公告)号：JPH09111430A
公开(公告)日：1997-04-28
申请号：JP26386795
申请日：1995-10-12
申请人： HITACHI LTD
发明人： KANI YASUNORI , NAKAMURA TSUNEO , YAMAGUCHI TERUO , MABUCHI KATSUMI
IPC分类号： C22B7/00 , C23C2/00
摘要： PROBLEM TO BE SOLVED: To eliminate the need for suspending a hot dip metal coating bath for the purpose of recovering the dross suspended on a coating bath surface by heating and continuously regenerating the dross in a reducing atmosphere, then supplying the dross to the coating bath. SOLUTION: A stainless strip 1 is immersed into molten zinc 13 and is continuously galvanized. Air is ejected from gas wiping nozzles 7 to the steel strip 1 after the galvanizing to adjust the coating weight of the galvanizing. The molten zinc is oxidized by the air injection and is made into zinc oxide. The zinc oxide is light and, thereafter, floats on the surface of the molten zinc 13, thereby forming the dross 8. Flow is generated on the surface of the molten zinc 13 by an electromagnet pump 9 to gather the dross 8 to one point. The dross 8 is charged into a reduction heating furnace 11 by a transporting device 10. The coke in this reduction heating furnace 11 is burned to CO, which reduces the dross 8 to zinc. The zinc is returned to a coating bath cell 5 by a supply pipe 12. Since the dross 8 is continuously removed, the high-quality coating is obtd. without intrusion of the dross 8 into the plating layer.

2. 发明专利

JP2585444B2 失效
公开(公告)号：JP2585444B2
公开(公告)日：1997-02-26
申请号：JP32849689
申请日：1989-12-20
申请人： HITACHI LTD
发明人： ITO MASAHIKO , MIDORIKAWA HEIHACHIRO , OONAKA NORYUKI , YAMAGUCHI TERUO , NAKAMURA TSUNEO
IPC分类号： C25F1/06 , C23G1/08 , C23G3/02 , C25F7/00

3. 发明专利

JPH08319600A METHOD FOR DESCALING STAINLESS STEEL STRIP AND DEVICE THEREFOR 失效
公开(公告)号：JPH08319600A
公开(公告)日：1996-12-03
申请号：JP13796296
申请日：1996-05-31
申请人： HITACHI LTD
发明人： ITO MASAHIKO , MIDORIKAWA HEIHACHIRO , ONAKA NORIYUKI , YAMAGUCHI TERUO , NAKAMURA TSUNEO
IPC分类号： C25F1/06 , C23G1/08 , C23G3/02
摘要： PURPOSE: To remove the scale on the surfaces of a stainless steel strip subjected to cold rolling and annealing in dissolving cells at a high speed by successively electrolyzing the chromium and iron in the oxide scale formed on the surfaces of the stainless steel strip and specifying the moving speed of the steel strip. CONSTITUTION: The stainless steel strip 1 subjected to cold rolling, annealing and cooling is introduced into the electrolytic cell 2 contg. an aq. neutral salt soln. The aq. soln. of Na2 SO4 , etc., having pH of about 6 is filled in the electrolytic cell 2 where the chromium in the scale is dissolved in the form of Cr2 O7 . The steel strip 1 is washed in a water washing tank 4 and is thereafter introduced into the electrolytic cell 6 contg. an aq. alkaline soln. The aq. soln. of NaOH, etc., is filled in this electrolytic cell 6 where the chromium oxide in the scale is dissolved away in the form of CrO4 . The steel strip 1 is introduced into the electrolytic cell 10 contg. an aq. nitric acid soln. after the water washing. The Fe(III) in the scale is converted to Fe(II) which is eluted as Fe in the soln. The scale on the surfaces of the stainless steel strip 1 are completely removed by three kinds of such electrolytic treatments. The moving speed of the steel strip 1 is specified to >=100m/min.

4. 发明专利

JPH0826444B2 失效
公开(公告)号：JPH0826444B2
公开(公告)日：1996-03-13
申请号：JP7436188
申请日：1988-03-30
申请人： HITACHI LTD
发明人： HONMA MASATOSHI , YAMAGUCHI TERUO , HASEGAWA TSUNENORI
IPC分类号： C23C2/00 , C23C2/20 , C23C2/40

5. 发明专利

JPH06248407A OPERATING METHOD FOR PLATING EQUIPMENT 失效
公开(公告)号：JPH06248407A
公开(公告)日：1994-09-06
申请号：JP3813593
申请日：1993-02-26
申请人： HITACHI LTD
发明人： KAJIWARA TOSHIYUKI , YAMAGUCHI TERUO , OGOSHI HITOSHI , NAKAMURA TSUNEO
IPC分类号： B21C47/26 , B21B1/28 , B21B13/02 , B21B31/10 , C23C2/02 , C23C2/40 , C23G1/00
摘要： PURPOSE:To provide the operating method for plating equipment capable of promptly producing many kinds of plated steel sheets desired by users at a low cost approximate to the cost for production of hot rolled and plated materials without rolling light-gaged steel sheets which are difficult to be rolled with hot strip mills. CONSTITUTION:Uncoiling machines 50a, 50b, a strip welding machine 2, a pickling device 5, a heating and reducing furnace 12, a plating bath cell 13 and a coiling machine 51 are arranged in this order. At least one stands of rolling mills 7 are arranged between the pickling device 5 and the heating and reducing furnace 12. A first stage for setting the rolling mills 7 open and, idly passing the strips through these mills and subjecting the strips to the plating treatment straight in the plating bath cell 13 and a second stage for subjecting the strips to cold rolling with the rolling mills 7 then to the plating treatment in the plating bath cell 13 are selectively executed according to the kinds of the plated products. The first stage is selected for the plated products of a thick sheet thickness and the second stage for the products of a thin sheet thickness.

6. 发明专利

JPH0313529A METHOD FOR ANNEALING STAINLESS STEEL 失效
公开(公告)号：JPH0313529A
公开(公告)日：1991-01-22
申请号：JP14566389
申请日：1989-06-08
申请人： HITACHI LTD
发明人： HONMA MASATOSHI , YAMAGUCHI TERUO
IPC分类号： B21B45/00 , C21D9/56 , C25F1/06
摘要： PURPOSE:To produce the annealed stainless steel strip which is free from scale by heating the cold rolled stainless steel strip in a direct fire furnace of a reducing heating gas, then subjecting the steel strip to an anodic electrolysis in an aq. neutral salt soln. and further to a cathodic electrolysis in a nitric acid ion-contg. pickling soln. at the time of annealing the above-mentioned stainless steel strip to soften the material quality. CONSTITUTION:After the stainless steel strips 6 which are provided with work hardening and work strains by the cold rolling are successively welded by a welding machine 2, the steel strips are heated to and held at >=810 deg.C in the high-temp. atmosphere of a high temp. of >=1400 deg.C in which the air for combustion is reduced to the quantity lower than the theoretical quantity and the content of the reducing gas, such as CO and H2 in the combustion gas is regulated to 3 to 6% and the content of O2 to 0% to provide a reducing property. The steel strip is thereafter cooled down to ordinary temp. in a cooling zone 8. The steel strip is then subjected to the anodic electrolysis treatment in an electrolytic tank 9 contg. an aq. soln. dissolved with Na2SO4 as a neutral salt and thereafter, the steel strip is cathodically electrolyzed, in a tank 13 of nitric acid or mixture composed of the nitric acid and hydrofluoric acid, by which the scale on the surface of the stainless steel strip 6 is completely removed and the annealed stainless steel strip having the excellent surface quality is produced.

7. 发明专利

JPH02122099A METHOD AND EQUIPMENT FOR DESCALING STAINLESS STEEL 失效
公开(公告)号：JPH02122099A
公开(公告)日：1990-05-09
申请号：JP27196088
申请日：1988-10-29
申请人： HITACHI LTD
发明人： ITO MASAHIKO , MIDORIKAWA HEIHACHIRO , IZUMITANI MASAKIYO , YAMAGUCHI TERUO
IPC分类号： B21B45/06 , C23G1/08 , C25F1/06 , C25F7/00
摘要： PURPOSE:To quickly descale a stainless steel strip by anodically electrolyzing the stainless steel strip which has been continuously annealed after cold rolling and has oxidized scale on the surface in a neutral salt aq. soln. and anodically electrolyzing the stainless steel strip in an alkali aq. soln. or immersing this steel strip therein and thereafter cathodically electrolyzing the stainless steel strip in a nitric acid aq. soln. or immersing this steel strip in the mixed aq. soln. of nitric acid and hydrofluoric acid. CONSTITUTION:Oxidized scale formed at a time of annealing exists on the surface of a stainless steel strip 1 which has been continuously annealed after cold rolling and therefore the oxidized scale is removed. The stainless steel strip 1 is passed through the middle part between the negative electrodes 3, 3' in an electrolytic cell 2 housing a neutral salt aq. soln. contg. Na2SO4 dissolved therein and impressed with positive voltage and anodically electrolyzed. This stainless steel strip is passed through a water-washing vessel 4 and thereafter immersed in an electrolytic cell 6 housing an alkali aq. soln. contg. an NaOH aq. soln. introduced thereinto or anodically electrolyzed as an anode between the cathodes 7, 7'. In this case, treatment of either the neutral salt aq. soln. or the alkali aq. soln. may be previously performed. Then the stainless steel strip is passed through a water-washing vessel 8 and thereafter catholically electrolyzed between the anodes 11, 11' in an electrolytic cell 10 housing a nitric acid aq. soln. or immersed in the mixed aq. soln. of nitric acid and hydrofluoric acid. The descaled stainless steel strip excellent in surface luster is obtained.

8. 发明专利

JPH0220618A ROLLER LEVELER 失效
公开(公告)号：JPH0220618A
公开(公告)日：1990-01-24
申请号：JP16674988
申请日：1988-07-06
申请人： HITACHI LTD
发明人： FURUZONO YOSHIHISA , KOJIMA TATSUJI , YAMAGUCHI TERUO
IPC分类号： B21D1/05
摘要： PURPOSE:To prevent bending damages of work rollers and burr of the front end of the stock by disposing plural backup rollers backward work rollers arranged zigzag upward and downward, reducing the diameter of several ones on the central part to expand fixing positions and magnifying the embracing angle. CONSTITUTION:The straightening load is received by the large diameter backup rollers 4 through the work rollers 2, the lateral load is received by the small diameter backup rollers 5 embracing the work rollers 2 widely to prevent that the work rollers 2 are not to be pushed out of the outlet side, even if the front end of the stock thrusts into the drums of the work rollers. Further, when a large rolling reduction is loaded by miss rolling reduction, etc., its lateral load is received by a stopper 6 set up between the work rollers 2 to prevent the moving of the work rollers 2.

9. 发明专利

JPH0215155A CONTINUOUS TYPE HOT DIPPING DEVICE 失效
公开(公告)号：JPH0215155A
公开(公告)日：1990-01-18
申请号：JP16502888
申请日：1988-07-04
申请人： HITACHI LTD
发明人： HONMA MASATOSHI , YAMAGUCHI TERUO , HASEGAWA TSUNENORI
IPC分类号： C23C2/20
摘要： PURPOSE:To reform and uniformize a plating layer on a steel strip by providing a weir which maintains the bath level of a hot dipping liquid and a device for changing the height thereof, etc., to the part above a sink roller and varying the height of the weir upward and downward. CONSTITUTION:A guide roller 10 which can move upward and downward is provided above the sink roller 9 disposed to a hot dipping tank and below gas wiping nozzles 13, 13'. A hot dipping liquid injecting device 16, the weir 18 which maintains the bath level, a driving machine 17 which changes the height thereof, and a controller which commands the driving of said machine are provided between this roller 10 and the steel strip 1. The height of the above-mentioned weir 18 is changed upward and downward in accordance with the vertical movement of the roller 10. The plating liquid 7 sticking to the steel strip wound around the roller 9 is wiped away by the above-mentioned nozzles 13, 13' of this device, by which the plating layer is reformed and uniformized.

10. 发明专利

JPS62161425A TIP LEADING DEVICE FOR PAYOFF REEL 失效
公开(公告)号：JPS62161425A
公开(公告)日：1987-07-17
申请号：JP339886
申请日：1986-01-13
申请人： KAWASAKI STEEL CO , HITACHI LTD
发明人： SONOYAMA KOKICHI , SUZUKI HIROKATSU , TAKAHASHI NORIO , TOYOSAKA HIDEO , SAGA HIROSHI , WATANABE MINORU , YAMAGUCHI TERUO
IPC分类号： B21C47/00 , B21C47/26 , B21C47/32 , B21C47/34
摘要： PURPOSE:To ensure the actuation of a device by providing the lower clamp roll and upper clamp freely ascendably and descendably on a truck and by fitting the noze bending roll which bends the coil tip to the upper part to the lower clamp roll as well. CONSTITUTION:The bed plate 30 of a truck is made freely movably via wheels 10, 10' on a rail 9 and a guide rod 35 is arranged on the truck freely ascendably and descendably by a rack 36, pinion 34 as well. The lower clamp roll 41 is provided via a bearing 43 at the lower end of the rod 35, moreover, the knife 44 scooping the coil tip E is engaged to the bearing 43 side. The tip of the knife 44 and clamp roll 41 are brought into contact with the coil 1 by descending both guide rods 35 by fitting the coil 1 to reel A. Then, the coil tip E is led to a pinch roll B by moving the truck by turning the reel A. In this way, the leading and feed-in works of the coil tip E can be ensured.

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