JP2713064B2 - Descaling device for hot rolled steel strip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to stainless steel, silicon
The present invention relates to a descaling device for a hot-rolled steel strip comprising a pickling device capable of descaling a hot-rolled steel strip of various types such as steel and carbon steel .

[0002]

2. Description of the Related Art As shown in FIG. 4, a pickling line for a hot-rolled hot-rolled steel strip is connected to a steel strip 52 unwound by a pay-off reel 51 and a preceding steel strip 54 by a welder 53. After passing through the entrance loop car 55, No. 1 tension bridle 56, tension leveler 57, no. After being introduced into a pickling tank 59 through a two-tension bridle 58 and contacting with the pickling liquid to be descaled, the pickling liquid is washed and removed in a rinsing tank 60, dried by a drier 61, and removed from the exit side loop car 62. After that, it is wound on the tension reel 63.

A pickling line for a carbon steel strip is generally pickled with hydrochloric acid. A mechanical leveling device, such as a tension leveler, a skin pass mill, a brush roll, a shot blast, etc., is arranged on the inlet side of the pickling tank. Techniques such as improving the scale performance are progressing. In addition, in order to improve the agitation property of the acid solution, a spray pickling method and a jet pickling method in which the tank is made shallow have been developed to improve the descaling effect.

[0004] On the other hand, the descaling stainless steel strip, scales Cr oxides of the steel sheet surface caused by the hot rolling and annealing, because made of Fe oxides, other oxides, generated carbon steel strip surface Since it is denser and firmer than the scale to be removed, even if it is directly removed by pickling, the penetration of acid is suppressed, the dissolution of the base metal is limited, and the descalability is extremely low. For this reason, as a mechanical descaling device, a shot blast, a grinding brush, etc. are arranged, and the acid solution used in the pickling tank is also a combination of sulfuric acid, hydrofluoric acid and neutral salt electrolysis and various kinds of pickling tanks. Is required. Therefore, hot rolling of conventional carbon steel
The descaling equipment for the steel strip and the stainless steel hot-rolled steel strip required independent lines.

[0005] pickling method in combination grinding brushes of the hot rolled strip is, Ji raw cracks in the scale layer of the steel strip in the pickling solution by a plurality of folding rollers provided in the pickling bath
Is allowed Rutotomoni total bending promote the penetration of pickling solution processing is added and then a method of polishing process of brushing the strip surface in the pickling solution (JP-B 57-51469 discloses), with respect to stainless steel strip A scale breaker for imparting a surface strain of 10% or more, and two or more pickling tanks for pickling a steel strip treated by the scale breaker,
Apparatus in which a grinding brush is provided at least at one position between the pickling tanks (JP-A-59-41482), a shot blasting mechanism, a neutral salt electrolytic pickling mechanism, a sulfuric acid pickling mechanism, a hydrofluoric acid pickling mechanism, and the like. (E.g., Japanese Patent Application Laid-Open No. 3-207879) in which a grinding brush mechanism is provided for each mechanism described above, and a cleaning brush mechanism and a drying mechanism are connected to the grinding brush mechanism of the hydrofluoric acid pickling mechanism. Proposed.

[0006]

Problems to be Solved by the Invention
According to the method disclosed in Japanese Patent No. 469, in order to rotate the brush roll in the pickling liquid, it is necessary to treat the bearing, the drive transmission system and the support base with acid resistance, which increases the equipment cost and the maintainability. Also have some difficulties and are not practical. Further, in the apparatus disclosed in Japanese Patent Application Laid-Open No. 59-41482, the brush roll stand can be installed independently of the pickling tank, so that the acid resistance treatment is compared with the method in which the brush roll is immersed in the pickling liquid. However, the acid solution used requires sulfuric acid, hydrofluoric acid, hydrofluoric acid, etc., and the acid solution treatment for each acid solution is also required independently. Further, even when cut acid solution the steel strip surface with a ringer over roll or the like between different acid tank, the cooling water used in a brush roll stand, because the scale and the thin acid solution is mixed separately brush roll stand It is necessary to treat the cooling water used in the above. Further, JP-A-3-207
The apparatus disclosed in Japanese Patent Publication No. 879 is disclosed in
The brush roll stand can be installed independently of the pickling tank as in the apparatus disclosed in Japanese Patent Application Publication No. JP-A-2006-209, so that the acid resistance treatment can be simplified as compared with a method of immersing the brush roll in a pickling solution. The acid solution to be used is a neutral salt electrolyte, sulfuric acid, and hydrofluoric acid. Naturally, the acid solution treatment for each acid solution is also required independently. Further, even when cut acid solution the steel strip surface with a ringer over roll or the like between different acid tank, the cooling water used in a brush roll stand, because the scale and the thin acid solution is mixed separately brush roll stand It is necessary to treat the cooling water used in the above. In addition, Japanese Patent Application Laid-Open No. Sho 59-41482
The descaling technique for stainless steel strips disclosed in Japanese Patent Application Laid-Open No. HEI 3-207879 and the like becomes complicated in terms of equipment when applied to a hydrochloric acid pickling line where pickling of carbon steel strip is performed. It is not a good idea because the cost rises.

It is an object of the present invention, not rent if carbon steel,
An object of the present invention is to provide a descaling apparatus capable of descaling hot rolled steel strips of a wide variety of steel types including stainless steel and silicon steel in an pickling line.

[0008]

Means for Solving the Problems The present inventors have intensively studied and studied to achieve the above object. As a result, pickling tanks jet type or Zupure pickling line before ringer over rolls of the partition zones between shallow for pickling tanks and pickling tank, placing a grinding brush roll having a cooling acid solution spray It is possible to simplify the acid resistance treatment of the bearing part of the grinding brush roll, and to change the brush wire diameter of the grinding brush roll to perform heavy grinding, medium grinding, and light grinding from the upstream side of the steel strip. not rent if steel, stainless steel, to hot rolled strip of silicon steel-mix concluded that a sufficient cope and reached to the present invention.

[0009] Namely the present invention, even Mashimashi hot rolled strip of multi varieties <br/> mixed a descaling device having a tension leveler to descaling capable inlet side, nozzle-type or spray type A plurality of pickling tanks, a pair of retractable upper and lower rotary grinding rolls disposed in a partition zone between the pickling tank and an adjacent pickling tank, and a pickling nozzle for injecting a pickling liquid to the rotary grinding rolls And the brush wire diameter of the rotary grinding roll is for heavy grinding, medium grinding, and light grinding from the upstream side of the steel strip. In addition, a jet-type or spray-type acid solution spray nozzle or an acid solution spray nozzle is used in combination with an acid solution nozzle that sprays a pickling solution onto a rotary grinding roll. Further, the reduction amount of the rotary grinding roll is made variable, and the reduction amount is controlled according to the steel type of the hot-rolled steel strip to be pickled.

[0010]

The descaling apparatus according to the present invention comprises a pair of upper and lower revolvable rotary grinders in a partition zone between adjacent pickling tanks of a plurality of jet or spray pickling tanks having a tension leveler on an inlet side. By placing the roll,
Repeated bending and elongation by the tension leveler on the entry side improve the descaling property and improve the flatness of the plate, and the descaling due to the collision between the hot-rolled steel strip and the pickling solution in the pickling tank continues. Grinding with the rotary grinding rolls, with heavy, medium and light grinding from the upstream side of the hot rolled steel strip, is repeated from the upstream side of the hot rolled steel strip, and if the rolling reduction of the rotary grinding roll is controlled, the hot rolled steel strip becomes stainless steel, Carbon steel like silicon steel
May de-scale is difficult steels compared, it can be descaled thoroughly by hydrochloric acid pickling.

Further, since the freely retracted rotating grinding rolls, stainless steel as hot rolled strip is carbon steel, when descaling is easy steels compared to the silicon steel, a large adhesion of scale In some cases, it is better to use a partly rotating grinding roll with high-temperature winding material, but usually it is necessary to open the rotating grinding roll gap and operate it to prevent increase in pickling loss and deterioration of surface shape, It is preferable to prevent wear of the brush of the rotary grinding roll.

In the present invention, the pickling tank is of the jet type or the spray type because the steel strip and the pickling liquid collide with each other, so that the pickling tank is excellent in descaling property, and the pickling tank is shallow, so that the pickling tank is adjacent to the pickling tank. The rotating grinding roll can be installed in the partition zone between the washing tanks, and the bearing of the rotating grinding roll is not immersed in the pickling liquid, so that acid-resistant treatment is easy, and the cooling spray to the rotating grinding roll is pickled. This is because it can be used by branching from the middle of the liquid pipe, and the number of pumps required can be reduced.

Further, in the present invention, since the pickling solution in the pickling tank is used as a cooling spray solution for the rotary grinding roll, the pickling solution is not diluted, and additional acid treatment can be performed. It becomes unnecessary. Furthermore, as a brush roll of the rotary grinding roll, for example, a brush containing abrasive grains made of nylon is used, and the steel strip surface is ground by rotating at 800 to 1200 rpm. The brush roll can prevent the increase in pickling loss and the deterioration of surface shape by sequentially changing the brush wire diameter and abrasive grain diameter so that heavy grinding, medium grinding and light grinding are performed from the upstream side of the steel strip. it can.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to FIGS. 1 is an overall explanatory diagram when applied to a spray pickling apparatus, FIG. 2 is an overall explanatory diagram when applied to a jet pickling apparatus, and FIG. 3 is an enlarged main part when applied to a jet pickling apparatus. It is an outline sectional view. In FIG. 1, 1 is a hot-rolled steel strip, 2 is No. No. 1 pickling tank, No. 3
No. 2 pickling tank, No. 4 3 Hot-rolled steel strip 1 repeatedly bent and stretched by a tension leveler (not shown) in a pickling tank
Is No. 1 pickling tank 2, no. 2 Pickling tank 3, No. 3 While passing through the pickling tanks 4 in order, the hydrochloric acid solution sprayed from the spray nozzles 5 provided at the front and rear ends of the pickling tanks 2, 3 and 4 onto the surface of the hot-rolled steel strip 1 and each pickling tank 2 Contact with hydrochloric acid solution in 3,4. No. 6 is a partition zone between the pickling tanks 2, 3, and 4 and No. 6; No. 1 Pickling tank 2 inlet and No. 1 3 Ringer rolls provided on the outlet side of the pickling tank 4;
In 3,4 retreat freely pair of upper and lower rotating grinding rolls arranged in front of the wringer roll 6 of the partition zones, hot rolled strip 1
When carbon steel is used, the operation is performed with the rotary grinding roll gap open to prevent increase in pickling loss and deterioration of the surface shape. Numeral 8 denotes a cooling pickling liquid spray nozzle of each rotary grinding roll 7, which is attached to a branch pipe (not shown) that branches off from the pickling liquid supply pipe (not shown) to the spray nozzle 5 of the pickling tank.
When the rotary grinding rolls 7 are used, a pickling solution for cooling is sprayed to each rotary grinding roll 7.

[0015] By the construction as described above, hydrochloric acid hydrochloric acid solution is sprayed from the spray nozzles 5 and in each pickling tanks 2, 3, 4 provided at the front and rear ends of each pickling tanks 2, 3, 4 The hot-rolled steel strip 1 that has been descaled in contact with the liquid is then mechanically brought into contact with the brush roll of a pair of upper and lower rotary grinding rolls 7 provided in a partition zone between the pickling tanks 2, 3, and 4. Since descaling is performed, descaling due to contact with the hydrochloric acid solution and mechanical descaling due to contact with the brush roll of the pair of upper and lower rotating grinding rolls 7 are alternately performed. In addition, a pair of upper and lower rotary grinding rolls 7 provided in a partition zone between the pickling tanks 2, 3, and 4 are provided with a brush wire diameter so that heavy grinding, medium grinding, and light grinding can be sequentially performed from the upstream side.
By sequentially changing the grain diameter of the abrasive grains, the grinding strength is changed according to the descaling amount of the surface of the hot-rolled steel strip 1, and the pickling loss and deterioration of the surface shape can be prevented. Moreover, descaling is poor grades, such as hot rolled strip 1 is stainless steel, rolling reduction of the brush roll pair of upper and lower rotating grinding rolls 7 provided in the partition zone between the pickling tanks 2, 3, 4 Is controlled to about 1 to 4 mm, sufficient descaling performance can be obtained.

2 and 3, reference numeral 11 denotes a hot-rolled steel strip, 1
No. 2 is No. No. 1 pickling tank; 2 pickling tank, 14 is N
o. No. 3 hot-rolled steel strip 11 repeatedly bent and given elongation by a tension leveler (not shown) in a pickling tank. 1 pickling tank 12, no. No. 2 pickling tank 13, No. While passing through the three pickling tanks 14 in order, they come in contact with hydrochloric acid solution sprayed from jet nozzles 15 provided above and below the front and rear ends of the pickling tanks 12, 13, and 14. Reference numeral 16 denotes a partition zone between the pickling tanks 12, 13, and 14, and No. 16; No. 1 pickling tank 12 inlet and no. 3
Ringer rolls 17 provided on the exit side of the pickling tank 14 are a pair of retractable upper and lower rotary grinding rolls disposed in front of the ringer rolls 16 in the partition zones of the respective pickling tanks 12, 13, 14. The pickling solution spray for cooling of each rotary grinding roll 17 is supplied from the acid solution tank 21 of the pickling tank to the jet pump 22.
Since the pickling liquid is supplied to the jet nozzle 15 in front of the rotary grinding roll 17, a hole is provided in the jet nozzle 15 so that a part of the pickling liquid is also jetted to the rotary grinding roll 17 side, and the cooling acid is supplied to each rotary grinding roll 17. The washing liquid is configured to be sprayed. Reference numeral 23 denotes an acid solution inflow pipe from the pickling tank to the acid solution tank 21.

[0017] By the construction as described above, the jet nozzles 15 provided in the front and rear ends of each pickling tanks 12, 13, 14
The heat descaled in contact with hydrochloric acid solution to be injected from the
The steel strip 11 is then mechanically descaled by contact with the brush rolls of a pair of upper and lower rotary grinding rolls 17 provided in a partition zone between the pickling tanks 12, 13, and 14, so that the hydrochloric acid solution and , And mechanical descaling alternately due to contact between the pair of upper and lower rotating grinding rolls 17 and the brush rolls. A pair of upper and lower rotary grinding rolls 17 provided in a partition zone between the pickling tanks 12, 13, and 14 are provided with a brush wire diameter and an abrasive grain diameter so that heavy grinding, medium grinding, and light grinding can be sequentially performed from the upstream side. Are sequentially changed, the grinding strength is changed according to the descaling amount of the surface of the hot-rolled steel strip 11, and the pickling loss and the deterioration of the surface shape can be prevented. Further, the hot-rolled steel strip 11 is made of stainless steel.
For steel grades with poor descalability , such as
The amount of reduction of the brush roll of the pair of upper and lower rotary grinding rolls 17 provided in the partition zone between 2, 13, and 14 is 1 to 4 mm.
If it is controlled to a sufficient degree, sufficient descaling performance can be obtained. Further, the hot-rolled steel strip 11 is made of carbon, which is easy to descaling.
In the case of steel, if the rotary grinding roll 17 is used, the pickling loss is increased and the surface shape is also deteriorated. Therefore, the brush roll gap is operated in an open state to prevent the pickling loss and the surface shape from being deteriorated.

[0018]

As described above, the descaling apparatus according to the present invention can be used for a wide variety of heat types including stainless steel.
Pickling of rolled steel strip is possible, and carbon steel and stainless steel, silica
Since it can be used as a descaling device for raw steel , and because the pickling liquid in the pickling tank is used for cooling the rotary grinding roll, there is no need to treat the cooling liquid, and the equipment cost can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is an overall explanatory diagram when the present invention is applied to a spray-type pickling apparatus .

FIG. 2 is an overall explanatory diagram when the present invention is applied to a jet pickling apparatus.

FIG. 3 is an enlarged schematic cross-sectional view of main parts when the present invention is applied to a jet pickling apparatus.

FIG. 4 is an explanatory diagram of a normal hot-rolled steel strip pickling line.

[Explanation of symbols]

1, 11 hot-rolled steel strip 2, 12 No. No. 1 pickling tank 3, 13 No. 2 Pickling tank 4, 14 No. 3 Pickling tank 5 Spray nozzle 6, 16 Ringer roll 7, 17 Rotary grinding roll 8 Pickling solution spray nozzle for cooling 15 Jet nozzle 21 Acid solution tank 22 Jet pump 22 23 Acid solution inflow pipe 51 Payoff reel 52 Steel strip 53 Welder 54 Leading steel strip 55 Entry loop car 56 No. 1 tension bridle 57 tension leveler 58 No. 2 tension bridle 59 pickling tank 60 rinse tank 61 dryer 62 outgoing loop car 63 tension reel

Claims (3)

(57) [Claims] [Claim 1] even if the hot-rolled steel strip of multi-varieties Mashimashi mixed de-scale
A Le is capable descaling device, a plurality of pickling tanks of nozzle-type or spray type, and retreat freely rotating grinding rolls arranged in the partition zone between the pickling tanks and the adjacent acid pickling tanks, said A hot-rolled steel strip comprising an acid solution nozzle for injecting a pickling solution onto a rotary grinding roll, and setting the brush wire diameter of the rotary grinding roll to heavy grinding, medium grinding, light grinding from the upstream side of the steel strip. Descaling device. 2. The hot rolling according to claim 1, wherein a jet or spray type acid solution spray nozzle or an acid solution spray nozzle is used in combination with an acid solution nozzle for spraying a pickling solution onto a rotary grinding roll. Descaling device for steel strip. 3. The reduction amount of a rotary grinding roll is made variable,
3. The descaling device for a hot-rolled steel strip according to claim 1, wherein the reduction amount is controlled according to the steel type of the hot-rolled steel strip to be pickled.