JPH0824904A - Manufacture of metallic strip - Google Patents

Abstract

PURPOSE:To provide an efficient manufacture of a metallic strip having a variety of surface finish such as a high temper finish. CONSTITUTION:A stainless steel strip 1 is passed through a series of annealing, descaling and rolling equipment 20 and, after annealing and descaling treatment by an annealing device 5 and descaling device 6, a high-temper finish rolling is performed by an initial stage rolling mill 9, a second mill 10 and a third mill 11 which are constituted as a four stages rolling mill. Since annealing, descaling and high-temper finish rolling, which are conventionally performed separately, are now continuously performed on the same line, the manufacturing process is reduced for the high-temper finish stainless steel strip, thus enabling its efficient manufacturing. The initial stage rolling mill 9 can be switched to a two stages rolling mill and used as a temper rolling mill; and therefore, a variety of manufacturing patterns are realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an efficient method for producing metal strips such as stainless steel strips, high alloy steel strips and high alloy strips which are subjected to various surface finishes such as high temper finish.

[0002]

2. Description of the Related Art Metal strips, such as stainless steel strips, have various surface finishes, for example, those specified in JIS G 4306 "Hot rolled stainless steel strips" in order to meet various applications. No. 1 finish, No. 1 specified in JIS G4307 "Cold rolled stainless steel strip". 2B finish and N
o. 2D finish, high temper finish, etc. are applied to the surface and commercialized.

FIG. 6 is an explanatory view showing a simplified manufacturing process of a temper rolled finish stainless steel strip according to the prior art. The temper rolled stainless steel strip has No. No. 1 finish, No. 1 2B and No. Includes 2D finished stainless steel strips. No. The first finish is a hot-rolled stainless steel strip that has been heat-treated and descaled. No. The 2B finish is a cold-rolled stainless steel strip that is annealed, descaled, and then lightly cold-rolled by a bright roll so as to obtain an appropriate gloss. The 2D finish is done by lightly cold rolling with a matte roll.

No. In one finishing course, the hot-rolled stainless steel strip is passed through an annealing descaling process 31 and an annealing descaling process is performed. The annealing descaling is performed in a series of annealing descaling equipment including an annealing device and a descaling device as disclosed in, for example, Japanese Patent Laid-Open No. 59-41482. The descaling device is configured by combining mechanical processing and chemical processing. The stainless steel strip is passed through an annealing and descaling step 31 and then a temper rolling step 32. Temper rolling process 3
In 2, the surface rolling and shape correction of the stainless steel strip are performed by the temper rolling mill. The temper rolling step 32 may be omitted if necessary.

No. 2B and No. In the 2D course, the hot-rolled stainless steel strip is annealed and descaled in the annealing and descaling step 31, and then passed through a cold rolling step 33. In the cold rolling process 33, a cluster type rolling mill, for example, a Levers type Sendzimir mill is arranged. The Sendzimir mill includes a mill body and front and rear surface winding reels that alternately unwind or wind a stainless steel strip coil. The diameter of the work roll of the Sendzimir mill is 40 to 120 mm, which is extremely smaller than that of other rolling mills. Mineral oil is used as a rolling agent for the Sendzimir mill. Mineral oil is a straight oil of low viscosity mineral oil and has excellent surface gloss. In the cold rolling step 33, the stainless steel strip is repeatedly revers rolled by the mill body and the front and rear surface winding reels until the plate thickness reaches a predetermined value. The number of passes of revers rolling is about 10 passes. After the cold rolling step 33, the stainless steel strip is passed through a final annealing descaling step 34, and an annealing descaling process is performed. The equipment installed in the final annealing descaling step 34 is exactly the same as the equipment installed in the annealing descaling step 31. The stainless steel strip is passed through a final annealing and descaling step 34 and then a temper rolling step 35. No. Two
In the case of B-finished stainless steel strip, bright temper rolling is performed in the temper rolling step 35. Bright temper rolling is performed using a bright roll at a light reduction rate. Bright temper rolling imparts an appropriate surface gloss to the surface of the stainless steel strip. No. In the case of 2D finished stainless steel strip, dull temper rolling is performed in the temper rolling step 35. Dull temper rolling is performed at a light reduction rate using a matte roll. The dull temper rolling imparts a silver-white dull luster to the surface of the stainless steel strip.

FIG. 7 is an explanatory view showing a simplified manufacturing process of a high-tempered stainless steel strip according to the prior art. The high temper finish is a finish obtained by subjecting a stainless steel strip to cold rolling at a cold reduction ratio that satisfies the required characteristics after annealing and descaling. High tempered stainless steel strip is a high strength stainless steel strip reinforced by cold rolling. In the hot-rolled high temper finishing course, the hot-rolled stainless steel strip is annealed and descaled in the annealing and descaling step 31, and then passed through a high temper finishing and rolling step 36. In the high-temper finish rolling step 36, the revers type Sendzimir mill is arranged. The high-temper finish rolling is performed until a predetermined cold rolling rate is reached using mineral oil as a rolling agent. The stainless steel strip is passed through a high-temper rolling finishing step 36 and subsequently a shape correcting step 37. In the shape correction process 37, a temper rolling mill, a tension leveler, etc. are arranged. In the shape correction step 37, the shape of the high temper finished stainless steel strip is corrected. In the cold-rolled high temper finishing course, the hot-rolled stainless steel strip was the above-mentioned No. 2B and No. Two
The final annealing descaling process is performed in the final annealing descaling process 34 through the same manufacturing process as the D course. The cold-rolled steel strip that has been subjected to the final annealing and descaling treatment is subjected to high-temper finish rolling in the same process as the hot-rolled high-temper finishing course, and then its shape is corrected.

High-tempered stainless steel strips are used for rail vehicle materials and spring materials. A metastable austenitic stainless steel, for example, SUS301, in which high-tempered stainless steel strip has processing-induced martensite generated by cold rolling to improve strength.
-L and the like apply. Table 1 is an example of specifications of high tempered stainless steel for vehicles. The standards are classified according to strength level, and proof strength, tensile strength, elongation, steepness, etc. are specified. It can be seen from Table 1 that the higher the strength level, the lower the standard value for elongation and the larger the standard value for steepness.

[0008]

[Table 1]

FIG. 8 is a schematic diagram showing the definition of steepness.
FIG. 9 is a diagram showing the relationship between the mechanical properties of a stainless steel strip and the cold reduction rate. The steepness is an index showing the shape of the plate. FIG. 8 shows a shape defect, so-called edge extension, which occurs at the peripheral portion of the plate. The steepness Λ is defined by Λ = (M / L) × 100 (%) (1) where L is the pitch of the edge extension and M is the height of the edge extension. The larger the steepness Λ, the worse the shape. The steepness Λ is similarly defined for a shape defect that occurs at the center of the width of the plate, that is, so-called medium elongation. FIG. 9 shows the relationship between the cold reduction ratio of the stainless steel strip and the proof stress 41, the tensile strength 42 and the elongation 43. The type of stainless steel strip is SUS301-L. From FIG. 9, it can be seen that as the cold reduction increases, the yield strength 41 and the tensile strength 42 increase, but the elongation decreases. The cold reduction rate of high-temper finish rolling is determined from the relationship diagram between the cold reduction rate and the mechanical properties, which is obtained in advance for each steel type so as to satisfy the standard value. Applicable steel type is SUS3
In the case of 01-L, FIG. 9 is used.

[0010]

According to the prior art, in the production of stainless steel strip, the annealing descaling step and the high temper finish rolling step and the annealing descaling step and the temper rolling step are separate steps. , Not linked. Therefore, the number of steps in the entire manufacturing process increases, and the manufacturing process is complicated. The complex manufacturing process
Productivity and efficiency decrease. The amount of in-process steel strip coil during each process increases. The number of manufacturing days required increases.
There are many problems such as an increase in the amount of transportation of steel strip coils.

Further, according to the prior art, the stainless steel strip is subjected to high temper rolling and cold rolling by a Levers type Sendzimir mill in the high temper finishing rolling step and the cold rolling step. The Sendzimir mill is equipped with a small-diameter work roll having an extremely small diameter as described above, and uses mineral oil as a rolling agent. As the diameter of the work roll becomes smaller, the contact area with the stainless steel strip becomes smaller, so that the shape of the rolled stainless steel strip becomes worse. Deterioration of the shape of the stainless steel strip increases the load of the shape correction process. In particular, high-tempered stainless steel strip has high strength, so it is difficult to correct the shape and the load becomes very large. The cold rolling agent is required to have lubricity, roll cooling property, cleaning property and surface gloss property. Mineral oil has excellent surface gloss but extremely poor roll cooling. When cold rolling is performed using a rolling agent with poor roll cooling properties, it is not possible to suppress the temperature rise of the rolling rolls, leading to a decrease in lubricity,
Surface defects such as seizure, so-called heat scratch, are likely to occur. Therefore, when cold rolling is performed using mineral oil as a rolling agent, high speed high speed rolling cannot be performed. When high-speed high-speed rolling cannot be performed under high pressure, the Levers-type Sendzimir mill has a large number of rolling passes and a long rolling time per pass, resulting in a significant decrease in productivity.

The object of the present invention is to provide a stainless steel strip, a high alloy steel strip, which is subjected to various surface finishes such as high temper finish,
An object of the present invention is to provide an efficient method for producing a metal strip such as a high alloy strip.

[0013]

DISCLOSURE OF THE INVENTION The present invention continuously connects a hot-rolled metal strip or a cold-rolled metal strip to a series of equipment in which a plurality of multiple rolling mills are arranged after an annealing device and a descaling device. A method for producing a metal strip is characterized in that a sheet is subjected to annealing, descaling, and temper rolling.

In the present invention, the hot-rolled metal strip or the cold-rolled metal strip is continuously passed through a series of equipments in which a plurality of multiple rolling mills are subsequently arranged in an annealing device and a descaling device, and then annealed. And a high-temper finish rolling after the descaling treatment.

In the present invention, the hot-rolled metal strip or the cold-rolled metal strip is continuously passed through a series of equipments in which a plurality of multiple rolling mills are subsequently arranged in an annealing device and a descaling device, and then annealed. Further, it is a method for producing a metal strip, which is characterized in that after the descaling treatment, temper rolling or high temper finish rolling is switched and performed.

Further, according to the present invention, a rolling mill capable of switching the arrangement of rolling rolls to a double or quadruple state is used in the first stage of the plurality of multiple rolling mills, and the temper rolling is a double rolling mill. It is characterized by using the first-stage rolling mill switched to the state.

Further, in the present invention, a rolling mill capable of switching the arrangement of rolling rolls to a double or quadruple state is used in the first stage of the plurality of multiple rolling mills, and the high-temper finish rolling is quadruple rolling. It is characterized in that it is carried out by using the first-stage rolling mill switched to the above state and a plurality of rolling mills at the latter stage.

Further, the present invention is characterized in that the temper rolling and the high temper finish rolling use a solution liquid as a rolling agent.

The present invention is also characterized in that the work roll diameter of the first-stage rolling mill is 600 mm to 870 mm in the double state and 400 mm to 600 mm in the quadruple state.

[0020]

According to the present invention, the hot-rolled metal strip or the cold-rolled metal strip is continuously passed through a series of equipments in which a plurality of multiple rolling mills are subsequently arranged in the annealing device and the descaling device, and is annealed. And after descaling, temper rolling is performed. Since annealing and descaling treatment and temper rolling, which were conventionally performed individually, are continuously performed in the same line,
The temper rolling finish hot-rolled metal strip or the cold-rolled metal strip can be manufactured efficiently because the manufacturing process can be shortened. Further, since the cold-rolled metal strip has a long steel strip length, the effect of shortening the process is greater than that of the hot-rolled metal strip.

Further, according to the present invention, the hot-rolled metal strip or the cold-rolled metal strip is continuously passed through a series of annealing and descaling rolling equipment, and is subjected to high temper finish rolling after annealing and descaling. Since the annealing and descaling treatment and the high-temper finish rolling, which were conventionally performed individually, are continuously performed in the same line, the high-temper finish metal strip can shorten the manufacturing process and enable efficient manufacturing. . Further, the high-temper finish rolling, which was conventionally performed by the Lever's type Sendzimir mill having low productivity, is performed by the tandem type rolling mill having excellent productivity, so that the productivity and efficiency are improved. Since the cold-rolled metal strip has a long steel strip length, the effect of shortening the process is greater than that of the hot-rolled metal strip.

Further, according to the present invention, the hot-rolled metal strip or the cold-rolled metal strip is continuously passed through a series of annealing descaling rolling equipment, and after annealing and descaling, temper rolling or high temper finishing rolling is switched. Can be done by Therefore, it is possible to quickly and efficiently respond to the demand for high-mix low-volume production. In addition, since the manufacturing patterns can be combined in various ways, the same material can be centrally produced with minimum material switching, or the same rolling type can be centrally produced with minimal switching between temper rolling and high temper finish rolling. Can also be freely selected.

Further, according to the present invention, a rolling mill capable of switching the arrangement of rolling rolls to a double or quadruple state is used in the first stage of a plurality of multiple rolling mills, and the temper rolling is a double rolling mill. It is performed using the first-stage rolling mill switched to the state. Since the first-stage rolling mill can be switched to a double or quadruple state, various types of rolling such as temper rolling, high temper finish rolling and cold rolling can be performed on the same line. Further, since the double rolling mill can use a work roll having a large diameter, temper rolling can be performed using a work roll having a large diameter having a good shape.

According to the present invention, the high temper finish rolling is performed by using the first-stage rolling mill and the latter-stage rolling mill which are switched to the quadruple state. The high-temper finish rolling by the quadruple rolling mill and the multi-rolling mill at the subsequent stage can carry out rolling with a wide reduction ratio, so that high-temper finished products having various strength levels can be manufactured.

According to the present invention, the temper rolling and the high temper finishing rolling use the solution as a rolling agent. Since the same type of rolling agent is used in the temper rolling and the high temper finishing rolling, the temper rolling and the high temper finishing rolling can be easily switched.

According to the invention, the work roll diameter of the first rolling mill is 600 mm to 870 mm in the double state.
Since it is 400 mm to 600 mm in the quadruple state, the work roll diameter can be selected according to the purpose. Therefore, a large-diameter roll having excellent shape characteristics can be used during temper rolling, and a medium-diameter roll having excellent rolling characteristics can be used during high temper rolling.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front view showing a simplified overall structure of an example of a series of annealing descale rolling equipment according to the present invention. The stainless steel strip 1 is mounted on the payoff reels 2a and 2b for each coil, and the preceding coil is paid out from the payoff reel 2a. When the passage of the leading coil is completed, the trailing coil is delivered from the payoff reel 2b, and the tail end of the leading coil and the tip of the trailing coil are welded by the welding device 3. Stainless steel strip 1 may be a hot rolled stainless steel strip or a cold rolled stainless steel strip. An inlet looper device 4 is arranged downstream of the welding device 3. Since the entrance looper device 4 stores the steel strip length required for continuously passing the stainless steel strip 1 on the downstream side, welding can be performed without stopping the strip running on the downstream side. . An annealing device 5 is provided downstream of the entrance looper device 4.
And a descaling device 6 is provided.

The stainless steel strip 1 is heated in the annealing furnace 5a of the annealing device 5 and cooled in the cooling device 5b to complete the annealing treatment, and then the descaling device 6 removes the mechanical treatment and the chemical treatment in combination. Scaled. The stainless steel strip 1 that has been subjected to the descaling process is continuously passed through the bridle device 8 via the exit looper device 7. A first-stage rolling mill 9 is disposed downstream of the bridle device 8. The first-stage rolling mill 9 is a rolling mill whose roll arrangement can be changed to a double rolling mill or a quadruple rolling mill. When the stainless steel strip 1 is cold-rolled subsequent to the annealing treatment and the descaling treatment, the first stage rolling mill 9 is configured as a quadruple rolling mill. FIG. 1 shows a state in which the first stage rolling mill 9 is configured as a quadruple rolling mill. When the stainless steel strip 1 is temper-rolled after the annealing treatment and the descaling treatment, the first stage rolling mill 9 is configured as a double rolling mill and used as a temper rolling mill. A shearing machine 16 for shearing the welded portion is arranged downstream of the first-stage rolling mill 9, and a front winding reel 18 for winding the stainless steel strip 1 via a deflector roll 17 is arranged. Front winding reel 1
8 and shears 16 are used when the stainless steel strip 1 is temper rolled.

On the downstream side of the front take-up reel 18, two six-fold rolling mills are arranged in tandem from the upstream side to the second mill 10 and the third mill 11 via a centering device 19. The 2nd mill 10 and the 3rd mill 11 are completely the same structures, and form a latter stage rolling mill. The intermediate roll of the six-fold rolling mill can reciprocate in the axial direction to perform roll shift for shape correction. The centering device 19 is used when the stainless steel strip 1 is cold-rolled. The centering device 19 is provided for the stainless steel strip 1 between the first-stage rolling mill 9 and the second mill 10 having a large gap.
It is provided to prevent vibration and meandering of the. The stainless steel strip 1 is cold-rolled by the first mill 9, then centered by the centering device 19, and is passed through the second mill 10 and the third mill 11 to be cold-rolled. A tension applying device 12 including a pair of upper and lower rolls is arranged on the downstream side of the third mill 11. The tension applying device 12 applies tension to the stainless steel strip 1 and cleans stains on the steel strip. A shearing machine 1 for shearing the welded portion of the stainless steel strip 1 is provided downstream of the tension applying device 12.
3 is provided, and a rear surface take-up reel 15 for taking up the stainless steel strip 1 via the deflector roll 14 is provided. The tension applied to the rear surface take-up reel 15 is small because the tension applying device 12 is interposed. Even if the shearing machine 13 shears the welded portion, the tension required for rolling is
Secured by the tension applying device 12.

FIG. 2 is a front view showing in simplified form the condition rolling which is one embodiment of the present invention in the series of annealing descale rolling equipment shown in FIG. The parts corresponding to those in FIG. 1 are designated by the same reference numerals. The stainless steel strip 1 has a series of annealing descale rolling equipment 20 shown in FIG.
After being continuously passed through, and annealed and descaled,
It is passed through the bridle device 8 to the first-stage rolling mill 9 and temper-rolled. The first-stage rolling mill 9 can switch the arrangement of the rolling rolls to the double or quadruple state as described above.
FIG. 2 shows a state in which the first stage rolling mill 9 is configured as a double rolling mill and is used as a temper rolling mill. The diameter of the work roll of the first stage rolling mill 9 configured as a double rolling mill is 760 mm, which is larger than the diameter of the work roll of the Sendzimir mill. The diameter of the work roll is
The larger the diameter, the larger the contact area with the stainless steel strip 1, and the rolling load increases. However, since the contact area is large, rolling with a stable shape can be performed. Therefore, although the first-stage rolling mill 9 configured as a double rolling mill is difficult to perform high pressure rolling, it is suitable for low pressure temper rolling. The range of the reduction ratio of temper rolling is 2 to 3%. When temper rolling is performed by the first-stage rolling mill 9, a solution is used as the temper rolling agent. The solution liquid is a water-soluble rolling agent containing an organic acid and an organic amine as main components. Organic acid concentration is 8-15
%, And the concentration of organic amine is 5 to 10%. The components of the solution liquid are adjusted so that the friction coefficient does not change depending on the temper rolling speed. After being temper-rolled, the stainless steel strip 1 is wound by a front winding reel 18 via a shearing machine 16 and a deflector roll 17. The shearing machine 16 shears the tail end welded portion of the stainless steel strip 1.

FIG. 3 is an explanatory view showing a simplified manufacturing process of a temper-rolled finished stainless steel strip which is an embodiment of the present invention. No. In one finishing course, the hot-rolled stainless steel strip is passed through an annealing, descaling and temper rolling step 21 in which a series of continuous annealing descaling equipment 20 shown in FIG. 1 is arranged. In the annealing, descaling and temper rolling step 21, the rolling equipment is arranged as shown in FIG. 2, and the annealing and descaling treatment and the temper rolling are performed in the same line. Since the annealing and descaling treatment and the temper rolling, which have been individually performed conventionally, are continuously performed in the same line, No. 1 finish hot-rolled stainless steel strip can shorten the manufacturing process,
Efficient manufacturing can be performed. No. 2B and N
o. In the 2D finishing course, the hot-rolled stainless steel strip is passed through the annealing, descaling and rolling process 22 in which the series of annealing and descaling equipment 20 is arranged. In the annealing, descaling and rolling process 22, the rolling equipment is arranged as in FIG. 1 and the front take-up reel 18 is not used. In the annealing, descaling and rolling process 22, annealing and descaling treatment and tandem cold rolling are performed in the same line. The tandem cold-rolled stainless steel strip is passed through the annealing, descaling and rolling step 22 and is then passed through the annealing, descaling and temper rolling step 21. The annealing, descaling and temper rolling are performed in the same line. And are done. Further, the cold-rolled stainless steel strip that is passed through the annealing, descaling and temper rolling process 21 is No. 1 in FIG. Two
B and No. It may be manufactured by the same process as the 2D finishing course.

FIG. 4 is a simplified front view showing a situation in which high temper finish rolling which is another embodiment of the present invention is carried out in the series of annealing descaling rolling equipment shown in FIG. The parts corresponding to those in FIG. 1 are designated by the same reference numerals. The stainless steel strip 1 is continuously passed through a series of annealing descaling equipment 20 shown in FIG. 1, annealed and descaled, and then passed through a bridle device 8 to a first stage rolling mill 9. The first-stage rolling mill 9 can switch the arrangement of the rolling rolls to the double or quadruple state as described above. FIG. 4 shows a state in which the first stage rolling mill 9 is configured as a quadruple rolling mill. The diameter of the work roll of the first stage rolling mill 9 is 460 mm, which is smaller than the diameter of the work roll in the double state. The diameter of the work roll is
The smaller the diameter, the smaller the contact area with the stainless steel strip 1, and the rolling load decreases. Therefore, the first stage rolling mill 9 configured as a quadruple rolling mill can be used as a cold rolling mill. When the first-pass rolling mill 9 performs high-temper finish rolling in the first pass, a solution is used as the rolling agent. The solution liquid is a water-soluble rolling agent containing an organic acid as a main component. Organic acid concentration is 4 ~
8% and the concentration of organic amine is 1% or less. The reason for reducing the concentration of the organic amine contained in the temper rolling agent is to prevent the property of the rolling agent from being deteriorated due to the mixing of the organic amine and the rolling agent of the subsequent subsequent rolling mill. . Since the temper rolling agent and the solution of the same kind are used for the rolling agent, it is possible to easily switch between the temper rolling and the high temper finish rolling.

The stainless steel strip 1 is first-tempered by high-temper rolling in the first-stage rolling mill 9, and then, through the centering device 19, a second mill 10 forming a second-stage rolling mill.
Then, the steel sheet is passed through the third mill 11, and high-temper finish rolling for the second and third passes is performed. 2nd mil 10
And the diameter of the work roll of the third mill 11 is 230-
The diameter is 250 mm, which is smaller than the diameter of the work roll of the first rolling mill. As the diameter of the work roll becomes smaller, the contact area with the stainless steel strip 1 becomes smaller, so that the rolling load decreases. Therefore, if the rolling load is maintained at the conventional level, the reduction amount can be increased by the reduction amount of the rolling load, so that high pressure rolling can be performed.
However, as described above, the smaller the diameter of the work roll, the worse the shape of the rolled material. Therefore, the diameter of the work roll is determined by the balance between the two. As described above, the diameter of the work roll of the Sendzimir mill used in the prior art is 40 to 120 mm, which is extremely smaller than the diameter of the work roll of the first-stage rolling mill and the latter-stage rolling mill. Therefore, the rolled shape of the high temper finished stainless steel strip according to the method of the present invention is better than that according to the prior art.

As the rolling agent for the second mill 10 and the third mill 11, a soluble oil in which a high-viscosity rolling oil containing a synthetic ester as a base oil is dispersed in water to form an emulsion is used. Since the high-viscosity rolling oil has a large oil film thickness, the lubricity is improved and the rolling load is reduced. Soluble oil has good roll cooling, heat scratches are less likely to occur, and there is less risk of fire. Therefore, in the second mill 10 and the third mill 11, high-speed high-speed cold rolling can be performed, so that highly efficient rolling with excellent productivity can be performed. The stainless steel strip 1 is subjected to high-temper finish rolling by the first-stage rolling mill 9 and the second mill 10 and the third mill 11 forming the latter-stage rolling mill. The cold reduction rate of the high temper finish rolling is determined from the relationship diagram between the cold reduction rate and the mechanical properties which are previously obtained for each steel type so as to satisfy the standard value as described above. The range of reduction ratio of high temper finish rolling is 4 to 40%. The stainless steel strip 1 is subjected to high temper finish rolling, and then wound on the rear surface winding reel 15 via the tension applying device 12, the shearing machine 13 and the deflector roll 14 described above.

FIG. 5 is an explanatory view showing a simplified manufacturing process of a high tempered stainless steel strip which is another embodiment of the present invention. In the hot rolling high temper finishing course, the hot rolled stainless steel strip is passed through the annealing, descaling and high temper finishing rolling step 23 in which the series of annealing descaling rolling equipment 20 is arranged.
Annealing, descaling and high temper finish rolling process 2
In Fig. 3, the rolling equipment is arranged as shown in Fig. 4, and annealing and descaling treatment and high temper finish rolling are performed in the same line. Since the annealing and descaling treatments and the high-temper finish rolling, which have conventionally been performed individually, are performed in the same line, the manufacturing process of the high-temper finish stainless steel strip can be shortened. The stainless steel strip is passed through the annealing, descaling and high temper rolling steps 23, and subsequently the shape correction step 24.
In the shape correction process, a temper rolling mill, a tension leveler, etc. are arranged. In the shape correction process 24, the shape of the high tempered stainless steel strip is corrected. In the cold rolled high temper finishing course, the hot rolled stainless steel strip is subjected to the annealing, descaling and rolling steps 22.
And is annealed, descaled, and tandem cold rolled in the same line. In the annealing, descaling and rolling process 22, rolling equipment is arranged as shown in FIG. The tandem cold-rolled stainless steel strip is annealed, descaled, and high-temper finished rolling step 2 as in the hot-rolled high-temper finishing course.
After passing through 3, the plate is passed through the shape correction process 24. The cold-rolled stainless steel strip that is passed through the annealing, descaling, and high-temper finish rolling step 23 may be manufactured by the same process as the conventional cold-rolled high-temper finish course of FIG. 7.

The first-stage rolling mill 9 can switch the arrangement of the rolling rolls to the double or quadruple state as described above, and the temper rolling uses the first-stage rolling mill 9 switched to the double state. Is done. High-temper finish rolling is performed using the first-stage rolling mill 9 switched to the quadruple state and the latter-stage rolling mill. Since the same type of solution is used as the rolling agent in the first-stage rolling mill 9 in both the temper rolling and the high temper finish rolling, the temper rolling and the high temper finish rolling can be easily switched. .
Therefore, in the series of annealing and descaling rolling equipment 20, various manufacturing patterns can be selected depending on the combination of the strip material and the rolling type. Table 2 shows three typical manufacturing patterns. Case 1 is
This is a manufacturing pattern in which temper rolling and high-temper finish rolling are switched and used as a strip material for a cold-rolled stainless steel strip. In case 1, since the product using the cold rolled stainless steel strip can be intensively produced, the number of manufacturing days required for the product is shortened. In addition, by switching the rolling method, it is possible to quickly meet the demand for high-mix low-volume production. Case 2 is a manufacturing pattern in which temper rolling and high-temper finish rolling are switched and used as a strip material for a hot-rolled stainless steel strip. In Case 2, the same operational effect as in Case 1 is recognized. Case 3 is a manufacturing pattern in which the cold rolling stainless steel strip or the hot rolling stainless steel strip is used as a strip material by switching between temper rolling and high temper finish rolling. In case 3,
As an example, a case is shown in which the switching between temper rolling and high-temper finish rolling is reduced and material switching is frequently performed. In this case, the number of times the first-stage rolling mill is switched to double or quadruple is reduced, so that the work rate and the productivity are improved. Various combinations are conceivable for the case 3, and the same material can be centrally produced with minimal material switching, or the sheet passing material and the rolling method can be produced in a completely random combination. In the latter case, it is possible to quickly and efficiently meet the demand for high-mix low-volume production.

[0037]

[Table 2]

The work roll diameter of the first stage rolling mill is changed depending on the arrangement of the rolling rolls. As for the work roll diameter of the rolling roll, the rolling load decreases as the diameter decreases,
The shape of the rolled material deteriorates. Therefore, a large-diameter roll excellent in shape is used during temper rolling performed in a double state. The work roll diameter of the first-stage rolling mill used in a double state is 600 mm to 870 mm. Further, during high temper rolling performed in a quadruple state, a medium diameter roll having a good balance of rollability and shape is used. The work roll diameter of the first-stage rolling mill used in a quadruple state is 400 m
It is m to 600 mm.

[0039]

As described above, according to the present invention, the hot-rolled metal strip or the cold-rolled metal strip is used as a series of equipment in which a plurality of multiple rolling mills are subsequently arranged in the annealing device and the descaling device. It is continuously threaded, annealed and descaled, and then temper-rolled. Since the annealing and descaling treatment and the temper rolling, which were conventionally performed individually, are continuously performed in the same line, the temper rolling finish hot-rolled metal strip or cold-rolled metal strip shortens the manufacturing process. Therefore, efficient manufacturing is possible. Therefore, it is possible to reduce the amount of work in progress of the steel strip coil between each process, shorten the required number of manufacturing days by shortening the process, and reduce the amount of transportation processing of the steel strip coil. Further, since the cold-rolled metal strip has a long steel strip length, the effect of shortening the process is greater than that of the hot-rolled metal strip.

Further, according to the present invention, the hot-rolled metal strip or the cold-rolled metal strip is continuously passed through a series of annealing descaling rolling equipment and subjected to high temper finish rolling after annealing and descaling. Since the annealing and descaling treatment and the high-temper finish rolling, which were conventionally performed individually, are performed continuously in the same line, the high-temper finish metal strip can shorten the manufacturing process and enable efficient manufacturing. Become. Therefore, it is possible to reduce the amount of work in progress of the steel strip coil between the respective processes, shorten the required number of manufacturing days by shortening the process, and reduce the amount of transportation processing of the steel strip coil. Further, since the cold-rolled metal strip has a long steel strip length, the effect of shortening the process is greater than that of the hot-rolled metal strip. Furthermore, because the high-temper finish rolling that was conventionally performed by the cluster type rolling machine with the small diameter work roll is performed by the tandem type rolling machine with the medium diameter work roll, the rolling shape of the high-temper finishing metal strip is improved, and the shape correction process The load is reduced.

Further, according to the present invention, the hot-rolled metal strip or the cold-rolled metal strip is continuously passed through a series of annealing descaling rolling equipment, and after the annealing and descaling treatment, temper rolling or high temper finishing rolling is performed. It can be switched. Therefore, it is possible to quickly and efficiently respond to the demand for high-mix low-volume production. Furthermore, it is possible to reduce the amount of steel strip coil work in progress between each process and improve the physical distribution. Also, since the manufacturing patterns can be combined in various ways,
It is possible to freely select the centralized production of the same material with the minimum material changeover or the centralized production with the same rolling method with the minimum changeover between the temper rolling and the high temper finish rolling. In the former case, the required number of manufacturing days of the product is shortened, and in the latter case, the number of times of switching between temper rolling and high temper finish rolling is reduced, so that the work rate and the productivity are improved.

Further, according to the present invention, a rolling mill capable of switching the arrangement of the rolling rolls to a double or quadruple state is used in the first stage of the multiple rolling mill, and the double rolling is performed in the temper rolling. It is performed using the first-stage rolling mill switched to the state. Since the first-stage rolling mill can be switched to a double or quadruple state, various types of rolling such as temper rolling, high temper finish rolling and cold rolling can be performed on the same line. Therefore, it is possible to quickly and efficiently respond to the demand for high-mix low-volume production. Further, since the double rolling mill can use a work roll having a large diameter, temper rolling can be performed using a work roll having a large diameter having a good shape.

Further, according to the present invention, the high-temper finish rolling is carried out by using the first-stage rolling mill and the latter-stage rolling mill switched to the quadruple state. High-temper finish rolling with a quadruple rolling mill and a post-stage multiple rolling mill can perform rolling with a wide range of reduction ratios, so that it becomes possible to manufacture high-temper finished products having various strength levels.

According to the present invention, the temper rolling and the high temper finish rolling use the solution as a rolling agent. Since the same type of rolling agent is used in the temper rolling and the high temper finishing rolling, the temper rolling and the high temper finishing rolling can be easily switched. Further, since mixing of different rolling agents does not occur, deterioration of properties of the rolling agents can be prevented.

Further, according to the present invention, the work roll diameter of the first rolling mill is 600 mm to 870 m in the double state.
m, 400 mm to 600 mm in a quadruple state
Therefore, the work roll diameter can be selected according to the purpose. Therefore, a large-diameter roll having excellent shape characteristics can be used during temper rolling, and a medium-diameter roll having excellent rolling characteristics can be used during high temper rolling.

[Brief description of drawings]

FIG. 1 is a front view showing a simplified overall configuration of an example of a series of annealing descaling rolling equipment according to the present invention.

FIG. 2 is a front view showing, in a simplified manner, a situation in which temper rolling, which is an embodiment of the present invention, is carried out in the series of annealing descaling rolling equipment shown in FIG.

FIG. 3 is an explanatory view showing a simplified manufacturing process of a temper-rolled finished stainless steel strip which is an embodiment of the present invention.

FIG. 4 is a simplified front view showing a situation in which high temper finish rolling, which is another embodiment of the present invention, is carried out in the series of annealing descaling rolling equipment shown in FIG. 1.

FIG. 5 is an explanatory view showing a simplified manufacturing process of a high temper finished stainless steel strip which is another embodiment of the present invention.

FIG. 6 is an explanatory view showing a simplified manufacturing process of a temper-rolled finished stainless steel strip according to the prior art.

FIG. 7 is an explanatory view showing a simplified manufacturing process of a high-tempered stainless steel strip according to the prior art.

FIG. 8 is a schematic diagram showing the definition of steepness.

FIG. 9 is a diagram showing the relationship between the mechanical properties of a stainless steel strip and the cold reduction rate.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Stainless steel strip 5 Annealing device 6 Descaling device 9 First stage rolling mill 10 2nd mill 11 3rd mill 12 Tensioning device 20 A series of annealing descaling rolling equipment 21 Annealing, descaling and temper rolling processes 22 Annealing, descaling And rolling process 23 Annealing, descaling and high temper finish rolling process 24 Shape correction process

Claims (7)

[Claims] 1. A hot-rolled metal strip or a cold-rolled metal strip is continuously passed through a series of equipments in which a plurality of multiple rolling mills are subsequently arranged in an annealing device and a descaling device to perform annealing and descaling. A method for producing a metal strip, which comprises temper rolling after the treatment. 2. A hot-rolled metal strip or a cold-rolled metal strip is continuously passed through a series of equipments in which a plurality of multiple rolling mills are subsequently arranged in an annealing device and a descaling device to perform annealing and descaling. A method for producing a metal strip, characterized by performing high-temper finish rolling after the treatment. 3. A hot-rolled metal strip or a cold-rolled metal strip is continuously passed through a series of equipments in which a plurality of multiple rolling mills are subsequently arranged in an annealing device and a descaling device to perform annealing and descaling. A method for producing a metal strip, characterized in that temper rolling or high temper finish rolling is switched after the treatment. 4. A rolling mill capable of switching the arrangement of rolling rolls to a double or quadruple state is used in the first stage of the multiple rolling mills, and the temper rolling is switched to a double state. The method for producing a metal strip according to claim 3, wherein the first rolling mill is used. 5. A rolling mill capable of switching the arrangement of rolling rolls to a double or quadruple state is used at the first stage of the plurality of multiple rolling mills, and the high-temper finish rolling is performed in a quadruple state. The method for producing a metal strip according to claim 3, wherein the switching is performed by using the switched first-stage rolling mill and a plurality of latter-stage rolling mills. 6. The method for producing a metal strip according to claim 3, wherein the temper rolling and the high temper finish rolling use a solution liquid as a rolling agent. 7. The metal strip according to claim 4, wherein the work roll diameter of the first stage rolling mill is 600 mm to 870 mm in the double state and 400 mm to 600 mm in the quadruple state. Production method.