JP2634991B2 - Manufacturing method of surface treated stainless steel sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a surface-treated stainless steel sheet, and more particularly to a cold rolled stainless steel having fine irregularities formed on the surface used for interior and exterior materials of buildings, exterior materials of vehicles and home electric appliances, and the like. The present invention relates to a method for manufacturing a surface-treated stainless steel sheet, which is suitable for manufacturing a steel sheet or the like.

[0002]

2. Description of the Related Art Cold rolled stainless steel sheets used as interior and exterior materials for buildings and exterior materials for vehicles and home electric appliances are manufactured by various methods such as polishing, dulling and embossing in accordance with the intended use. Finishing has been done.

[0003] In particular, in the polishing finish, different surface finish conditions can be obtained depending on the difference in the grain size of the polishing belt used and the polishing method, and it is easy to perform correction after forming, for example, repair of welding marks. For reasons such as possible
Most commonly done.

[0004]

However, the conventional polishing finish is a processing method in which the surface of a stainless steel plate is provided with a long polishing line in the same direction as the rotation direction of the polishing belt. There is a problem that there is a glaring luster along the surface and therefore, a uniform matte surface such as dull finish is not obtained.

[0005] The above-mentioned polishing and finishing method has a drawback that work hardening is caused by polishing the obtained product, and a drawback that the corrosion resistance is generally inferior to that of 2B material due to the formation of a minute bent portion on the surface. doing.

[0006] In addition, the above dull finish has a problem that, although a uniform matte surface is obtained as described above, it is not easy to correct it after molding.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and has the characteristics of a polished eye which can be easily corrected after molding, and has almost no glaring metallic luster along the polished eye. Another object of the present invention is to provide a method for producing a surface-treated steel sheet capable of producing a cold-rolled stainless steel sheet or the like having a matte surface close to a dull finish and, for example, excellent corrosion resistance equivalent to that of a 2B material.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a method for producing a surface-treated stainless steel sheet for producing a stainless steel sheet having a surface with fine irregularities, wherein the surface of the stainless steel sheet is polished to a predetermined surface roughness by belt polishing. After polishing, the stainless steel plate is formed by the belt polishing.
First work roll having a surface roughness smaller than the surface roughness
And then larger than the first work roll
The object has been achieved by rolling with a second work roll having a surface roughness .

[0009]

According to the present invention, in the method for producing a surface-treated stainless steel sheet, the stainless steel sheet formed by belt polishing has a surface roughness Ra (A) of 0.2 to 0.4.
μm, surface roughness of the first work roll: Ra (B)
However, the surface roughness of the second work roll: Ra (C) is approximately equal to Ra (A), which is 1/2 to 1/3 of Ra (A).

[0011]

In the present invention, the surface of a stainless steel sheet is
After polishing to a predetermined surface roughness by belt polishing, the stainless steel plate is rolled by a work roll having a specific surface roughness, so that the metallic luster formed in one direction by belt polishing is reduced. As a result, antiglare properties can be imparted to the steel sheet surface.

The degree to which the surface roughness of the work roll used for rolling is transferred to the steel sheet is affected by the rolling reduction in the rolling pass, the deformability of the steel sheet, and the rolling conditions (speed, presence or absence of lubricating oil, etc.). Although the relationship between the surface roughness of the work roll used and the surface roughness (polished surface roughness) Ra (A) of the steel sheet formed by belt polishing cannot be strictly defined, the polished surface roughness of the steel sheet However, when there is a significant difference from the surface roughness of the work roll to be used (for example, the polished surface roughness Ra (A) is 20 to 40 μm and the roll surface roughness Ra of the initial rolling pass is 0.5 to 1 μm). Except for the case where the rolling ratio in finish rolling is set to, for example, 10 to 20%, good antiglare property can be obtained.

[0013] Here, the rolling ratio is determined before rolling and after rolling (2
In the case of pass rolling, after the second pass rolling)
When t ₀ and _{t n, {(t 0 -} t n) / t 0} × 1
This is a value given by 00 (%).

When the rolling ratio is 10% or less, the transfer of the surface roughness of the work roll is insufficient, and when the rolling ratio is 20% or more, not only is it unnecessary to obtain a desired surface state, but also the material is processed. Since curing proceeds, heat treatment for softening is indispensable.

[0015] In the present invention, after the belt polished steel plates, and the rolling of the first pass in the first work roll having a small surface roughness than the surface roughness formed by the belt polishing, furthermore, the so as to rolling the second pass in a second work roll having a larger surface roughness than 1 work rolls
ing. Therefore , the roughness of the first work roll, which has been slightly finely finished in the first pass of finish rolling, is transferred to the polishing eye formed of long irregularities aligned in one direction caused by belt polishing, and then the second work having a large roughness is transferred. By rolling using a roll, the unidirectionality of the polished eyes can be disturbed, so that the glittering metallic luster along the polished eyes can be reliably reduced.

This will be described in more detail. First, in order to give a surface roughness required as a matte surface to a polishing surface,
The surface of the steel plate is polished to a predetermined surface roughness by belt polishing.

However, in this state of the polished surface, as described above, the directionality of the polished eyes is remarkable, so that the polished surface is insufficient as a matte surface. Therefore, first, in the first pass, rolling is performed under light pressure using a first work roll having a relatively finely finished surface roughness. That is, the first work roll is appropriately rolled to smooth the polished surface while leaving a relatively deep portion in the polished eyes formed by the belt polishing, thereby dividing the long polished eyes, The fine polishing marks on the roll surface can be transferred to the polishing surface.

Thereafter, the steel sheet is rolled using a second work roll that is finished coarser than the first work roll in the second pass,
By transferring the polished eyes of the rough roll to the polished surface,
It is possible to further divide the long polished stitches formed by the previous belt polishing and to provide appropriate irregularities.

By performing the above-described processing, the divided deep grooves (the belt-polishing line and the coarse second-work-roll-side polishing line (surface roughness)) can be formed based on the belt-polishing line. A transfer surface) and a fine unevenness (a transfer portion of a finely polished stitch (surface roughness) of the first work roll) are combined, so that a calm matte surface with less directivity is obtained.

As a result of a detailed study by the present inventor, it has been found that it is sometimes preferable that the following relationship be established between each roughness combination in order to obtain good surface properties.

Surface roughness of steel sheet surface formed by belt polishing: Ra (A) Ra (A) = 0.2-0.4 μm, Surface roughness of first work roll (fine roll): Ra
(B) Ra (B) = (1/2/3) × Ra (A) Surface roughness of the second work roll (coarse roll): Ra
(C) Ra (C) ≒ Ra (A)

The relationship between the respective surface roughnesses is an optimum range empirically obtained by evaluating the antiglare property and the stain removal property, and the like. If the surface roughness is too fine, the antiglare property is inferior. If it is too coarse, it is easily stained, and the stain removal property during washing is poor.

When the roughness is transferred by the two-stage rolling, it is effective to set the minimum rolling ratio in each of the first and second passes to 5%.

According to the present invention described in detail above, the polished surfaces formed by belt polishing and aligned in one direction are once smoothed by the first
The work roll smoothes the polished surface of the steel sheet, and furthermore, the second work roll having a large surface roughness is used for the basis weight, so that the belt polishing line is cut off, and the polished surface characteristics due to the belt polishing are reduced, and as a result, the directionality is reduced. A surface with little anti-glare properties can be obtained.

On the other hand, Japanese Unexamined Patent Application Publication No. 55-94705
The method disclosed in is a method of transferring fine roll polishing irregularities by temper rolling on the slope of the polishing grain by the belt formed on the polishing surface of the steel sheet, the obtained steel sheet by belt polishing Glittering surface properties remain strong.

Further, the surface-treated stainless steel sheet obtained by the present invention has an advantage in maintenance that dirt attached to the surface is easily removed because the belt polishing property is reduced.

In general, a polished finish is inferior in corrosion resistance,
Since the present invention is a combination of steps for reducing the influence of coil polishing, there is also an advantage that deterioration of corrosion resistance is small.

[0028]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing processing steps applied to a method of manufacturing a surface-treated stainless steel sheet according to one embodiment of the present invention.

In this embodiment, according to the processing steps shown in FIG. 1, sheet rolling (intermediate rolling) is performed in the same manner as a normal stainless steel sheet.
In step 10, the steel sheet is rolled to a predetermined thickness, then in an annealing / pickling step 12, the steel sheet is softened and recrystallized, and the surface thereof is cleaned. Polish.

Thereafter, in the finish rolling step 16, finish rolling is performed to give predetermined irregularities to the steel sheet surface, the steel sheet after the finish rolling is degreased in the degreasing step 18, the flatness is adjusted in the flatness correction step 20, and the shearing step is performed. Shearing is performed to a predetermined size at 22 to obtain a target surface-treated stainless steel plate (product).

In this embodiment, in the belt polishing step 14,
On the surface of a stainless steel plate, for example, a roughness Ra (A) ≒ 0.
2 to 0.4 μm and finish rolling step 16
The feature is that the polished steel sheet is subjected to the first pass rolling by the first work roll and the second pass rolling by the second work roll.

Next, specific results according to the present embodiment will be described.

In the belt polishing step 14 shown in FIG. 4 Finishing (belt polishing), and then, in a finish rolling step 16, the stainless steel plate is rolled with a first work roll having a surface roughness Ra (B) of 0.2 μm in the first pass, and further two passes. The eye will use it for surface roughness Ra
(C) = Rolled on a second work roll of 0.4 μm.

FIG. 2 shows the surface condition (roughness profile) of the cold-rolled stainless steel sheet obtained by the above-described embodiment, and shows the surface roughness, the number of peaks (the number of peaks of 0.5 μm or more) and Each state value of the whiteness is shown in Table 1 below.

Table 1 shows the surface condition of the stainless steel sheet manufactured by one No. 4 finish and one dull finish by the conventional method, respectively, for comparison, as shown in FIGS. 3 and 4. And the measured surface state values are also shown. In Table 1, the L direction is a direction parallel to the rolling direction, and the C direction is a direction perpendicular to the rolling direction.

In the conventional No. 4 finish, the flatness is corrected following the annealing and pickling treatment, and then the belt is polished.
4 Finishing, shearing it into a product,
The dull finish is substantially the same as that of the present embodiment except that dulling is performed as finish rolling without performing belt polishing.

[0038]

[Table 1]

From the above Table 1, it can be seen that the surface roughness of the steel sheet obtained in this example is close to the No. 4 finish, but the whiteness is close to the dull finish, and the directionality is reduced. You can see that. This fact is also apparent when comparing FIG. 2 showing the roughness profile with FIGS. 3 and 4.

Actually, the matte surface has the characteristics of the polished eyes which can be easily corrected after the forming process, has almost no glaring metallic luster along the polished eyes, and has a dull finish.
A cold-rolled stainless steel sheet having the same corrosion resistance as the 2B material could be obtained.

[0041]

As described above, according to the present invention, while having the characteristics of the polished eyes which can be easily corrected after the forming process, there is almost no glaring metallic luster along the polished eyes, and a dull finish is obtained. A surface-treated steel sheet such as a cold-rolled stainless steel sheet having a close matte surface and excellent corrosion resistance can be manufactured.

[Brief description of the drawings]

FIG. 1 is a block diagram showing processing steps applied to an embodiment according to the present invention.

FIG. 2 is a diagram showing a surface roughness profile of a stainless steel sheet manufactured by the method of the present invention.

FIG. 3 is a diagram showing a surface roughness profile of a stainless steel plate with a conventional No. 4 finish.

FIG. 4 is a diagram showing a steel plate roughness profile on a stainless steel surface by a conventional dull finish.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Plate rolling process 12 ... Annealing and pickling process 14 ... Belt polishing process 16 ... Finish rolling process 18 ... Degreasing process 20 ... Flatness correction process 22 ... Shearing process

Claims (2)

(57) [Claims] 1. A method of manufacturing a surface-treated stainless steel sheet for manufacturing a stainless steel sheet having a surface with fine irregularities, comprising: polishing the surface of a stainless steel sheet to a predetermined surface roughness by belt polishing; The surface formed by the belt polishing
Pressure is applied to the first work roll having a surface roughness smaller than the roughness.
And then further increase the surface roughness greater than the first work roll.
A method for producing a surface-treated stainless steel sheet, comprising rolling with a second work roll. 2. The stainless steel sheet formed by belt polishing according to claim 1, wherein the surface roughness Ra (A) is 0.2 to 0.4 μm, and the surface roughness Ra of the first work roll is Ra (B ) Is 1 / of Ra (A)
2/3, and the surface roughness of the second work roll: Ra
(C) is substantially equal to Ra (A).