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1. 发明专利

JPH09195028A HOT DIP COATING DEVICE 失效
公开(公告)号：JPH09195028A
公开(公告)日：1997-07-29
申请号：JP2606396
申请日：1996-01-20
申请人： NIPPON STEEL CORP
发明人： SAITO TAKEHIKO , SUGIYAMA SEIJI
IPC分类号： C23C2/20 , C23C2/30
摘要： PROBLEM TO BE SOLVED: To provide a hot dip coating device with which the surfaces of a steel sheet are made clean, uniform plating layers are formed thereon, the moving speed of the steel sheet is increased and workability and mass productivity are improved. SOLUTION: This hot dip coating device A has a flux vessel 12 in which the suspended fluxes 18 floating in a plating bath 19 at the time of immersing the steel sheet 17 coated with the fluxes into this bath are gathered and which is internally sealed with a non-oxidizing gas. The device described above has a throat 20 which is arranged in the steel sheet 17 charging section of this flux vessel 12, encloses the steel sheet 17 charged therein and has a prescribed length and non-oxidizing gas blowing means 21 which blow the non-oxidizing gases to the steel sheet 17 passing this throat 20.

2. 发明专利

JPH0770722A CONTINUOUS GALVANIZING METHOD 失效
公开(公告)号：JPH0770722A
公开(公告)日：1995-03-14
申请号：JP21624693
申请日：1993-08-31
申请人： NIPPON STEEL CORP
发明人： NAGAI KAZUNORI , SAITO TAKEHIKO , SUGIYAMA SEIJI
IPC分类号： C23C2/00 , C23C2/06
摘要： PURPOSE:To prevent the degradation in the efficiency of a plating operation by bottom dross and the degradation in the quality of a plating surface by gathering the bottom dross formed in a galvanizing tank to the bottom of a plating tank. CONSTITUTION:The plating tank 1 is separated by a partition wall 3 to a galvanizing bath tank 4 and a reaction treating tank 5 and an open part 7 is disposed between the bottom end of the partition wall 3 and the bottom of the plating tank 1 at the time of galvanizing a steel strip, etc. The bottom dross BD of a heavy sp. gr. is produced by the Fe eluted from the steel strip and molten Zn during the galvanizing operation of the steel strip. The bottom dross accumulates on the inclined bottom face of the bottom of the plating tank 1 and fills the open part 7, thereby forming a reaction treating vessel part 5 on the right side of the partition wall 3. Al is added to the part and the galvanizing bath in the plating tank 1 is transferred thereto by a pump 8. The Al-rich Zn bath in the reaction treating vessel 5 is diffused into the bottom dross BD and is floated as the top dross TD of a low sp. gr. which is then easily removed. The degradation in the quality of the galvanized steel sheet by integration of the bottom dross BD is prevented.

3. 发明专利

JPH0853741A DEVICE FOR REMOVING FOREIGN MATTER ON BATH SURFACE WITHIN SNOUT IN HOT DIP COATING 失效
公开(公告)号：JPH0853741A
公开(公告)日：1996-02-27
申请号：JP18749494
申请日：1994-08-09
申请人： NIPPON STEEL CORP
发明人： SAITO TAKEHIKO , NAGAI KAZUNORI
IPC分类号： C23C2/00
摘要： PURPOSE:To efficiently remove foreign matter on the bath surface in a snout with this device arranged with nonoxidizing gas ejecting nozzles by specifically providing the inside wall on the snout bath with these nozzles. CONSTITUTION:A strip S passes the snout 1 disposed along its feed-in plane and advances into a plating bath B, where this strip passes along an in-bath roll 2 and is carried out perpendicularly. This device is provided with the perforated nozzles 3 for ejecting gaseous N2 in both side directions of the fed-in strip S over the entire width of the strip S downward by providing the nozzles with a gradient of a prescribed angle theta1 with the strip S. The gases ejected out of the nozzles 3 form the gaseous flow G1 ejected in the pass direction of the strip. These gases flow on the plating bath surface along both surfaces of the strip S, and further, flow toward the direction opposite to the strip S on the bath surface. Consequently, the foreign matter on the bath surface within the snout suspended on the bath surface is moved to the wall side of the snout and is parted from the point where the strip and S are fed in. The part near the contact point of the strip S and the bath is thus cleaned.

4. 发明专利

JPH0762508A CONTINUOUS HOT DIP GALVANIZING METHOD 失效
公开(公告)号：JPH0762508A
公开(公告)日：1995-03-07
申请号：JP20971393
申请日：1993-08-24
申请人： NIPPON STEEL CORP
发明人： NAGAI KAZUNORI , SAITO TAKEHIKO , SUGIYAMA SEIJI
IPC分类号： C23C2/00 , C23C2/06
摘要： PURPOSE:To simplify the control of aluminum addition in preventing the generation of dross flaws in hot dip galvanizing to reduce dross to zinc by adding aluminum into the dross and to eliminate the influence of the addition of the aluminum to the galvanizing bath. CONSTITUTION:This continuous hot dip galvanizing method comprises dividing a galvanizing bath cell 1 by a partition wall 3 opened in the lower part to a plating cell part 4 and a reaction cell part 5, forming the base of this plating cell part 4 to a slope downgrading toward this reaction cell part 5 and adding the aluminum to the dross in this reaction cell, thereby removing the dross in the galvanizing bath. The open part in the lower part of the partition wall 3 is packed and sealed by the dross, by which the diffusion of the aluminum to the galvanizing bath vessel is prevented. As a result, the restriction of maintaining the amt. of the aluminum to be added to the reaction chamber in the equil. state at all times is eliminated. The addition of the large amt. of the aluminum is thus possible, insofar as the sealing by the bottom dross is maintained. The adjustment of the amt. of the addition is thus facilitated.

5. 发明专利

JPH108229A PRODUCTION OF PLATED STEEL STRIP 失效
公开(公告)号：JPH108229A
公开(公告)日：1998-01-13
申请号：JP18552196
申请日：1996-06-25
申请人： NIPPON STEEL CORP
发明人： SAITO TAKEHIKO , KATAOKA TAKEHARU , MIZUGUCHI MASAYOSHI
IPC分类号： C23C2/02 , C23C2/30 , C23C2/40
摘要： PROBLEM TO BE SOLVED: To provide a method for producing a plated steel strip capable of preventing the remaining of flux in a plated steel strip and thus capable of improving the appearance properties and corrosion resistance of the plated steel strip. SOLUTION: This method for producing a plated steel strip is the one in which the surface of a continuously fed steel strip 11 is coated with flux 22, after that, it is passed through the inside of a hot dip metal bath 13, and hot dip metal 13a is adhered to the surface of the steel strip 11, by which the surface of the steel strip 11 is coated with plating coating. In this case, the hot dip metal 13a is sprayed on the lower face of the steel strip 11 obliquely infiltrated into the hot dip metal bath 13, by which the flux 22 adhered to the lower face of the steel strip 11 is removed.

6. 发明专利

JPH08318306A DESCALING DEVICE FOR HOT ROLLING STOCK 失效
公开(公告)号：JPH08318306A
公开(公告)日：1996-12-03
申请号：JP12544795
申请日：1995-05-24
申请人： NIPPON STEEL CORP
发明人： SAITO TAKEHIKO
IPC分类号： B08B3/02 , B21B45/08
摘要： PURPOSE: To provide a descaling device with which pealability is improved as compared to conventional descaling, scales are almost peeled by one pass, productivity is raised and thermal loss is reduced. CONSTITUTION: In the descaling device for hot rolled steel sheets, descaling nozzles for spraying water jets in the reverse direction to the passing direction are provided in double-stage in front of a roughing mill, spray angles of the respective nozzles are taken as [the spray angle (θ1 ) of the prestage nozzle]

7. 发明专利

JPH0949068A PRODUCTION OF HOT DIP COATED STEEL SHEET 失效
公开(公告)号：JPH0949068A
公开(公告)日：1997-02-18
申请号：JP20371095
申请日：1995-08-10
申请人： NIPPON STEEL CORP
发明人： SUGIYAMA SEIJI , SAITO TAKEHIKO , NAGAI KAZUNORI
IPC分类号： C23C2/02 , C23C2/06 , C23C2/08 , C23C2/10 , C23C2/30
摘要： PROBLEM TO BE SOLVED: To suppress the adhesion of a deteriorated flux to a steel sheet, to prevent the formation of bite flaws and to improve the yield of products by lowering the oxygen concn. of the flux deposited and suspended on a plating bath surface at the time of plating. SOLUTION: A small amt. of the flux is applied on the steel sheet A after annealing, degreasing, pickling, pre-electroplating and pre-flux treating by a flux applying device 23 prior to hot dip coating and, thereafter, the steel sheet is immersed into a plating bath 13. At this time, a nonoxidizing gas is injected into the plating bath 13 from a nonoxidizing gas introducing pipe 25 disposed in a flux vessel 12 on the surface of the plating bath, by which the oxygen concn. in the flux vessel 12 and the oxygen concn. on a flux 12' floating on the plating bath surface are kept at

8. 发明专利

JPH07188999A PREPARATION OF PLATING SOLUTION 失效
公开(公告)号：JPH07188999A
公开(公告)日：1995-07-25
申请号：JP33836693
申请日：1993-12-28
申请人： NIPPON STEEL CORP
发明人： NAGAI KAZUNORI , SAITO TAKEHIKO
IPC分类号： C25D3/56 , C25D21/14 , C25D21/18
摘要： PURPOSE:To continuously supply a highly clean plating soln. by introducing a plating soln. discharged from a plating tank into an aq. sob. contg. metallic salts and passing the soln. alternately through two or more impurity removing devices packed with activated carbon. CONSTITUTION:Metallic Zn and a metallic salt such as NiSO4 are dissolved in a tank 1, and a plating soln. discharged from a plating tank and contg. impurities is introduced into the prepared soln. The soln. is circulated successively through a buffer tank 2, an impurity removing device 3, a main tank 4 and the buffer tank 2 and purified. The purified plating soln. is sent to a plating tank 5. Two or more impurity removing devices 3 are provided and alternately used. The device 3 is packed with activated carbon, a heater is furnished, an inert gas is supplied, and the impurties in the plating soln. are effectively removed. The time and labor to exchange the activated carbon are saved since two or more devices 3 are used. The activated carbon having adsorbed impurities is heated in an inert gas atmosphere, and the adsorbed impurities are discharged into the gas.

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