JP2000355781A - Production of titanium sheet or titanium alloy sheet having beautiful surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformize the glosiness inter-sheet or intra-sheet by operating a continuous annealing and pickling line or a pickling line so that a titanium sheet or a titanium alloy sheet is passed through a pickling tank provided with an immersion roll plural times and is also passed through the pickling tank to be properly inversed. SOLUTION: Since the surface side of a titanium sheet is made in contact with an immersion roll arranged at a pickling tank thereby shotening the pickling time therefor, the titanium sheet is passed through a pickling tank plural times and further is passed through the tank to be properly inversed to obtain the titanium sheet having beautiful surfaces with homogeneous glosses in front/ rear surfaces. For inversing the titanium sheet, the sheet is coiled in a direction inverse to the coiling direction at the inlet side of a pickling line, and is moved to the inlet side of the pickling tank and is again passed through the pickling tank. Also, even when the operation is executed so that the concn. of the titanium ions in the pickling tank desirably is 2 to 80 g/l, the titanium sheet with homogeneous glosses can be obtd. If necessary, the level of the glosiness can freely be controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of manufacturing a titanium plate or a titanium alloy plate continuously in a continuous processing line in which only annealing and pickling or pickling is performed. And a useful method for homogenizing the glossiness of the inside.

[0002]

2. Description of the Related Art In recent years, with the progress of waterfront development and the occurrence of acid rain, the environment surrounding buildings such as buildings has become severer. In addition, maintenance costs are rising. For these reasons, attention has been paid to maintenance-free building materials that are excellent in corrosion resistance, have a long service life, and are maintenance-free. Under such circumstances, the amount of building materials composed of titanium plates and titanium alloy plates (hereinafter sometimes referred to as “titanium plates”) has been steadily increasing recently.

The main reason for this tendency is that titanium has extremely excellent corrosion resistance and is hardly corroded in the air environment. However, titanium has a unique silver-white color and has various designs due to surface treatment. Is also a factor that favors titanium. Further, as the application of titanium to buildings has increased, the requirements for surface design have been diversified, and in particular, control of surface glossiness has been increasingly required.

By the way, as a surface finishing method of a pure titanium plate for building materials, vacuum annealing finishing and pickling finishing are known roughly. Of these, the titanium plate obtained by vacuum annealing has a glare because it has a surface skin as rolled,
The aesthetic appearance is impaired, and it is difficult to control the glossiness, which often causes a problem due to differences in glossiness depending on parts in an actual article. In contrast to the vacuum annealing finish, the pickling finish is often preferred because the surface glossiness can be set to a relatively low level and the reflection of light can be suppressed.

When a titanium plate of a pickling finish is industrially obtained, a continuous annealing pickling line having the structure shown in FIG. 1 is generally used. In this line, an air annealing furnace, a salt bath, and an acid pickling tank are arranged in series, and a titanium plate (strip) is sequentially passed through these devices to anneal and descale a cold-rolled pure titanium plate for building materials. Can be performed continuously. Of these steps, atmospheric annealing is performed for the purpose of removing strain generated by cold rolling and adjusting the structure to obtain desired mechanical properties.

[0006] The immersion in the salt bath is carried out to make it easy to remove scales generated by the air annealing by pickling.
About 5 mainly containing sodium hydroxide and sodium nitrate
When the titanium plate after the air annealing is immersed in a high-temperature salt bath of 00 ° C., a part of the scale is dissolved and the scale is cracked by thermal shock. Thereafter, when pickling is performed using nitric hydrofluoric acid, the pickling liquid permeates through the cracks to the base metal, and the interface between the scale and the base metal is dissolved. As a result,
Complete scale removal and metallic luster. Since the continuous annealing and pickling line has multiple steps as described above, the relationship between each processing condition and glossiness is not sufficiently clarified, and the glossiness between titanium plates or within the same titanium plate is not uniform. It is difficult, though not as good as in vacuum annealing. Also, no clear method has been established for obtaining the glossiness required by the user.

For example, JP-A-8-296071 discloses a method for producing a titanium material having reduced gloss and excellent anti-glare properties. In this technique, the gloss between titanium plates or within the same titanium plate is reduced. There is a problem that uniformity cannot be achieved. Japanese Patent Application Laid-Open No. 9-3573 also discloses a titanium material having excellent antiglare properties and a method for producing the same. However, in reality, the glossiness between titanium plates or within the same titanium plate cannot be made uniform.

[0008]

SUMMARY OF THE INVENTION The present invention has been made under such a circumstance, and an object of the present invention is to provide a continuous annealing pickling line or a line for performing only pickling, in which a titanium plate or a titanium alloy plate is used. An object of the present invention is to provide a method capable of homogenizing the glossiness between plates or within the same plate when performing pickling finish.

[0009]

Means for Solving the Problems The method of the present invention which has attained the above-mentioned object is that a dipping roll is used when a titanium plate or a titanium alloy plate is pickled in a continuous annealing pickling line or a pickling line. A method for producing a titanium plate or a titanium alloy plate having a gist in that the pickling tank is passed through a plurality of times, and the titanium plate or the titanium alloy plate is turned upside down and passed through the pickling tank to operate. .

The above object can also be achieved by adopting any one of the following constitutions (1) to (3).
It is also effective to use them in combination if necessary. As such a method, for example, the above configuration and the following (3)
The method of simultaneously satisfying the configurations (1) and (3), the method of simultaneously satisfying the following configurations (2) and (3), and the like are effective. It is also effective to simultaneously satisfy the above configuration and all of the following configurations (1) to (3). (1) When performing a pickling finish on a titanium plate or a titanium alloy plate having a different plate width in a continuous annealing pickling line or a pickling line, the difference between the width of the preceding plate and the width of the succeeding plate is 50 times the width of the preceding plate. %. (2) When performing a pickling finish on a titanium plate or a titanium alloy plate in a continuous annealing pickling line or a pickling line,
The operation is performed such that the concentration of titanium ions in the pickling liquid is 0.1 g / l or more. (3) When performing continuous pickling finishing of a titanium plate or a titanium alloy plate in a continuous annealing pickling line, the operation is performed such that the oxygen content in the furnace atmosphere in the annealing furnace is 1% by volume or more.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In order to achieve the above object, the present inventors have studied the relationship between the operating conditions and conditions of a continuous annealing pickling line or a pickling line and the glossiness of a coil after pickling from various angles. did. As a result, the following was clarified.
First, it was found that the glossiness of the front and back surfaces of a titanium plate (or a titanium alloy plate) which had been passed only once in a continuous annealing pickling line or a pickling line was greatly different. The reason why this phenomenon occurs can be considered as follows.

FIG. 2 shows the state of immersion of the titanium plate in the pickling tank.
As shown in the figure, the pickling conditions for the front and back surfaces of the titanium plate in the pickling tank, that is, the contact time (immersion time) with the pickling solution and the stirring conditions are different, so that the pickling amount on the front and back surfaces is different, which is the gloss on the front and back surfaces. It is thought to appear as a difference in degree. For example, a pickling tank is generally provided with a dipping roll for dipping the titanium plate, but as shown in FIG. 2, the front side of the titanium plate comes into contact with the dipping roll, The pickling time is shortened by the minute. Therefore, when performing pickling finishing of a titanium plate in a continuous annealing pickling line or a pickling line, the pickling tank having a dip roll is passed through a plurality of times, and the titanium plate is appropriately inverted to remove the pickling tank. If the operation was performed so as to pass through, a beautiful titanium plate (or titanium alloy plate) having a uniform gloss on both sides was obtained.

The method of inverting the titanium plate is not particularly limited. Typically, however, the winding direction when winding the titanium plate once passed through the pickling tank into a coil shape is devised. Can be achieved. That is, as shown in FIG. 3, it is taken up in the direction opposite to the inlet side of the continuous annealing pickling line (or pickling line), moved to the inlet side of the pickling tank, and passed through the pickling tank again. You can make it happen.

FIG. 4 schematically shows the relationship between the gloss change and the pickling amount (reduction in sheet thickness after pickling). The gloss increases in the early stage of pickling, and changes gradually thereafter. Become.
Therefore, even after passing through the line twice while reversing the titanium plate as described above, even if the titanium plate is passed again for further fine adjustment of the glossiness and removal of scratches, the gloss difference between the front and back surfaces of the titanium plate is thereby reduced. It does not grow. As will be described later, the glossiness is affected not only by the pickling amount but also by the average crystal grain size described later, and the graph shown in FIG.
This is when the thickness is about 25 μm.

The present inventors have found that when a plurality of titanium plates are continuously pickled in a continuous annealing pickling line or a pickling line, the difference between the width of the preceding plate and the width of the succeeding plate is always the width of the preceding plate. It has also been found that a titanium plate having a uniform surface and a beautiful surface can be obtained if the operation is performed so as to be 50% or less.

In this method, when the sheet width difference exceeds 50%, the amount of oxygen in the annealing furnace fluctuates greatly between the preceding sheet and the succeeding sheet (because the amount of oxygen consumed in the oxidation reaction differs). The densities of the scales are different, and consequently the easiness of dropping the scales by pickling is different, and the pickling amount is different between coils. If the difference in plate width is too large, the reaction area changes greatly, so that the temperature of the pickling liquid differs for each titanium plate. As a result, the pickling amount differs for each titanium plate, and this appears as a difference in glossiness.

Furthermore, it has been found that the above object can be achieved even if the following configuration is adopted. That is, when performing a pickling finish on a titanium plate in a continuous annealing pickling line or a pickling line, the titanium ion concentration in the pickling solution is always 0.1%.
Even when the operation was carried out at g / l or more, a beautiful titanium plate having a uniform gloss and a beautiful surface was obtained. The reason that the above-described effect is obtained by such a configuration can be considered as follows.

Titanium ions have an oxidizing property by nature and have an effect of increasing the pickling rate, but if the content exceeds a certain amount, they have an action of decreasing the pickling rate. This threshold is 0.1 g /
l. Therefore, if the pickling solution is pickled with a titanium ion concentration of less than 0.1 g / l (including 0 g / l), the pickling reaction is not stable, and the pickling amount is partially different, As a result, it is considered that a difference in glossiness occurs. On the other hand, if the concentration of titanium ions in the pickling solution is too high, the titanium ions greatly inhibit the pickling reaction, making it difficult for the pickling reaction to proceed. Therefore, the upper limit is preferably 100 g / l. The preferred range of the titanium ion concentration in the pickling solution is about 2 to 80 g / l.

The inventors of the present invention have found that when performing pickling finishing of a titanium plate in a continuous annealing pickling line or a pickling line, the oxygen content in the furnace atmosphere during annealing is always at least 1% by volume. It has also been found that a fine titanium plate having a uniform surface and a beautiful surface can be obtained by operating it. If the oxygen concentration in the furnace atmosphere at the time of annealing is less than 1% by volume, a very fine scale is formed, and this is not completely removed by salt immersion. Cause a difference in gloss. Note that a preferable lower limit of the oxygen amount in the furnace atmosphere is 3% by volume, and a preferable upper limit is 20% by volume (atmospheric atmosphere).

As a method of controlling the oxygen concentration in the furnace atmosphere at the time of annealing, for example, Japanese Patent Application Laid-Open No. 5-222558 discloses a technique in which the amount of oxygen in the furnace is set to 1 to 10% by volume in the annealing of austenitic stainless steel. Is disclosed.
However, this technique is described because the scale thickness is increased when the oxygen content in the furnace is out of the above range, and it is difficult to remove the scale in the subsequent pickling. On the other hand, in the case of titanium, unlike the case of stainless steel, the thickness of the scale is determined by temperature and time without depending on the oxygen concentration. That is, in the case of titanium, the difference in scale removal due to the difference in oxygen concentration is due to the nature of the scale as described above.

On the other hand, the present inventors, when performing pickling finishing of a titanium plate in a continuous annealing pickling line or a pickling line, when the pickling amount is represented by the reduction in thickness after pickling, this amount It has also been found that operating with a pickling amount such that the particle size is 1 μm or more is effective in obtaining a beautiful titanium plate having a uniform gloss and a beautiful surface.

The reason why such an effect is obtained is as follows.
This can be explained from the relationship between the pickling amount and the gloss (FIG. 4). That is, as shown in FIG. 4, the region where the pickling amount is less than 1 μm is a region where the glossiness sharply changes due to the pickling, and a slight difference in the pickling amount depending on the portion is a difference in the glossiness. reflect. On the other hand, in the region where the pickling amount is 1 μm or more, the glossiness does not change rapidly due to the pickling, so that the difference in the glossiness due to the difference in the pickling amount does not significantly occur,
A uniform luster will be obtained.

The amount of this pickling can be controlled by the time of immersing the titanium plate in the pickling tank, the concentration of the pickling solution and the temperature. The upper limit of the pickling amount is not limited, but if it is too large, it becomes impractical.
About 200 μm is appropriate. In addition, it is considered that the same effect can be obtained between the case where the titanium plate is passed a plurality of times without annealing and the case where the titanium plate is passed only once if the total pickling amount is the same.

Further, the present inventors, when performing continuous pickling finishing of a titanium plate in a continuous annealing pickling line, control the average crystal grain size of the titanium plate in the range of 5 to 60 μm by devising annealing conditions. It has been found that performing pickling after that is effective in obtaining a beautiful titanium plate having a uniform gloss and a beautiful surface.

If the average crystal grain size is less than 5 μm, the macrostructure of the material is conspicuous, and this results in uneven gloss. On the other hand, if the average crystal grain size exceeds 60 μm, it becomes mirror-like due to pickling, and subtle undulations (eaves, middle elongation, etc.) of the material will cause a local difference in glossiness. .

FIG. 5 shows the effect of the pickling amount and the average crystal grain size on the glossiness. As is apparent from FIG. 5, it is necessary to adjust the pickling amount and the average crystal grain size within an appropriate range. Means that the gloss level can be adjusted freely.

Hereinafter, the present invention will be described in more detail with reference to examples. However, the following examples do not limit the present invention. It is included in the technical scope.

[0028]

EXAMPLE 1 In a continuous annealing pickling line having the structure shown in FIG.
Table 1 below shows a cold-rolled pure titanium plate with a thickness of 1 mm with the following specifications.
The plate was passed 1 to 5 times under the following conditions. At this time, the front and back surfaces of the titanium plate were turned upside down in the pickling tank for each sheet passing. That is, the line plate was passed a plurality of times so that each of the front and back surfaces of the titanium plate faced the ground side at least once or more in the pickling tank. The glossiness of the front and back surfaces of the titanium plate after pickling was measured. At this time, the gloss was measured according to JIS Z874.
The method was performed in accordance with the method of Example 1, and the incident angle and the light receiving angle were both 60 °.

The glossiness of each of the front and back surfaces (the front surface (the front side at this time) is the surface facing the ceiling in the pickling tank in the last pass-through time) Measured at a total of three places at the front and rear ends of the titanium plate and at the center in the length direction (all measured at the center in the width direction), and the average of these values was measured for the surface (Omoten) and back (Uramen) gloss, respectively. Degree.
If the difference in glossiness exceeds 10%, it is determined that there is a difference in glossiness (that is, the difference is not uniform).

The results are shown in Table 2 below, and can be considered as follows from Table 2. After one pass, the gloss difference between the front and back surfaces is large, but after two passes, the gloss difference between the front and back surfaces is reduced to a level that does not hinder practical use, and the glossiness becomes constant as the number of passes increases It is approaching the value.

From these results, it is possible to pass the line a plurality of times, and to appropriately reverse the front and back surfaces of the titanium plate at least once or more so as to face the ground side in the pickling tank.
It turns out that it is effective in producing a titanium plate having a uniform gloss on the surface.

[0032]

[Table 1]

[0033]

[Table 2]

Example 2 In the continuous annealing pickling line having the structure shown in FIG.
Pass two titanium plates of different thickness under the conditions of Table 3 below,
The gloss of the surface of each titanium after pickling was measured. At this time, the width of the preceding plate was fixed at 1 m.

The gloss was measured at a total of three places at the leading and trailing ends of the leading plate and the trailing plate and at the center in the longitudinal direction. Central part in the direction], the average value of the three measured values of the preceding plate and the three measured values of the succeeding plate was defined as the glossiness of the preceding plate and the following plate.

The results are shown in Table 4 below, and can be considered as follows from Table 4. First, no. In Nos. 1 to 5, since the difference in the width of the continuous titanium plate is 50% or less of the width of the preceding plate, the difference in glossiness between the two titanium plates is small.
On the other hand, No. In the case of 6,7, the difference of the board width is 50%
, The difference in glossiness between the two titanium plates is large.

From these results, it is effective to operate the titanium plate so that the difference in the width of the continuous titanium plate is 50% or less of the preceding plate in order to produce a beautiful titanium plate having a uniform gloss and a beautiful surface. It turns out that it is.

[0038]

[Table 3]

[0039]

[Table 4]

Embodiment 3 In the continuous annealing pickling line having the structure shown in FIG.
The titanium ion concentration in the pickling solution was variously changed, and the titanium plate was passed under the conditions shown in Table 5 below, and the surface of each titanium plate after pickling was checked for uneven gloss (local difference in gloss). investigated.
The gloss unevenness at this time was measured by the above-described method for the glossiness of a portion where the gloss looks locally different and a uniform portion around the portion, and evaluated based on the difference. If the difference is 10% or more, it can be determined that there is uneven gloss.

The results are shown in Table 6 below. From the results, the following can be considered. First, no. In Nos. 1 to 5, since the concentration of titanium ions in the pickling solution was within an appropriate range of 0.1 to 100 g / l, no uneven gloss was observed.
On the other hand, No. In the samples of Nos. 6 to 8, since the concentration of titanium ions in the pickling liquid was out of the above range, the occurrence of uneven gloss was observed.

From these results, it can be seen that keeping the concentration of titanium ions in the pickling solution within the range of 0.1 to 100 g / l is effective for producing a titanium or titanium alloy coil having a beautiful surface.

[0043]

[Table 5]

[0044]

[Table 6]

Embodiment 4 In the continuous annealing pickling line having the structure shown in FIG.
After varying the oxygen concentration in the annealing path, the coil was passed under the conditions shown in Table 7 below, and the surface of each titanium plate after pickling was examined for gloss unevenness in the same manner as in Example 3.

The results are shown in Table 8 below. From the results, the following can be considered. First, no. In Nos. 1 to 4, gloss unevenness did not occur because the oxygen concentration was 1% or more. On the other hand, No. Samples Nos. 5 and 6 had too low an oxygen concentration of less than 1%, and thus had uneven gloss.

From these results, it is effective to maintain the oxygen concentration in the furnace atmosphere in the annealing furnace at least in the range of 1% or more to produce a beautiful titanium plate having a uniform gloss and a beautiful surface. I understand.

[0048]

[Table 7]

[0049]

[Table 8]

Example 5 In the continuous annealing pickling line having the structure shown in FIG.
The amount of pickling (thickness loss after pickling) was changed variously, the titanium plate was passed under the conditions of Table 9 below, and the presence or absence of uneven gloss on the surface of each titanium plate after pickling was the same as in Example 3. Was investigated.

The results are shown in Table 10 below. From the results, the following can be considered. First, no. In Nos. 1 to 6, the pickling amount was 1 μm or more, and no uneven gloss was observed. On the other hand, No. In the cases of Nos. 7 and 8, since the pickling amount was out of the above range, the occurrence of uneven gloss was observed.

From these results, it can be seen that operating with the pickling amount represented by the thickness reduction of 1 μm or more is effective in producing a beautiful titanium plate having a uniform gloss and a beautiful surface.

[0053]

[Table 9]

[0054]

[Table 10]

Embodiment 6 In the continuous annealing pickling line having the structure shown in FIG.
The annealing temperature was variously changed to change the crystal grain size of the titanium plate, the coil was passed under the conditions of Table 11 below, and the presence or absence of uneven gloss on the surface of each titanium plate after pickling was determined in the same manner as in Example 3. investigated.

The results are shown in Table 12 below. From the results, the following can be considered. First, no. 1-5
Since the crystal grain size was in the range of 5 to 60 μm, generation of uneven gloss was not recognized. On the other hand, No. 6-8
Since the crystal grain size is out of the above range,
Uneven gloss was occurring. In addition, No. 7 and 8
Although the difference in gloss was less than 10%, a slight undulation of the plate was seen as a difference in gloss when visually observed.

From these results, it was found that the crystal grain size was 5 to 60 μm.
It can be seen that keeping in the range of m is effective in producing a beautiful titanium plate having a uniform gloss and a beautiful surface.

[0058]

[Table 11]

[0059]

[Table 12]

Example 7 In the continuous annealing pickling line having the structure shown in FIG.
A pure titanium plate (coil) having a thickness of 1 mm and a total length of 100 m was continuously passed through a cold-rolled pure titanium plate (coil) with 10 coils each under the conditions shown in each of A to Y in Table 13 below. At this time, the continuous 10 coils were formed by connecting a total of 10 coils having the plate widths of the leading coil and the trailing coil shown in Table 13 alternately. Evaluation of the glossiness of each titanium plate surface after pickling was performed as follows. Table 14 below shows other passing conditions. The air annealing in Table 14 was performed only for the first pass.

[Evaluation method of gloss] (Passing conditions A to G) Front and back surfaces of each coil [However, the front surface (oomomen) at this time is placed in the pickling tank in the last pass-through time. With the side facing the ceiling side]
The glossiness at the center in the width direction was measured every 5 m, and 20 surface measurement values and 20 rear surface measurement values were compared. The maximum value of the difference was defined as the gloss difference between the front and back surfaces of each coil. With respect to the gloss difference, an average value for a total of 10 coils was obtained, and this was defined as the gloss difference in Table 13.

(Passing conditions H to N) On the surface of each coil (otenmen), the glossiness at the center in the width direction was measured every 5 m, and the measured value between the successive coils, that is, the preceding coil Were compared with the 20 measured values of the following coil, and the maximum value of the difference was defined as the gloss difference between the coils. Then, an average value of nine measurement values of the gloss difference was determined, and this value was used as the gloss difference in Table 13.

(Passing conditions O to U) On the surface of each coil (omotenmen), the glossiness at the center in the width direction was measured every 5 m, and the maximum value among the 20 measured values was determined for each coil. Gloss difference. Then, for the gloss difference, a total of 10
The average value of the coil components was determined, and this was defined as the gloss difference in Table 13.

(Passing conditions Y to Y) On the front and back surfaces of each coil, the glossiness at the center in the width direction was measured every 5 m.
The measured values of a total of 10 coils were compared without distinction between the front and back surfaces and between the coils, and the largest difference in glossiness among them was taken as the glossiness difference in Table 13. The results are shown in Table 13 below.

[0065]

[Table 13]

[0066]

[Table 14]

From the results, the following can be considered. First,
In those manufactured under the passing conditions A to D, the coils were appropriately inverted and the oxygen amount in the furnace was set in an appropriate range. Therefore, the passing conditions E and F in which only the oxygen amount in the furnace was set in an appropriate range. It can be seen that the gloss difference is smaller than that of the sheet passing condition and the sheet passing condition G that does not satisfy any of the above requirements.

In the case of the sheet manufactured under the passing conditions H to K, the difference between the sheet widths of the preceding coil and the succeeding coil is 50% of the sheet width of the preceding coil.
% Or less and the furnace oxygen amount is set in an appropriate range, so that the passing conditions L and M in which only the furnace oxygen amount is set in an appropriate range and any of the above requirements are satisfied. It can be seen that the gloss difference is smaller than that under the non-passing condition N.

In the products manufactured under the passing conditions O to R, the titanium ion concentration in the pickling solution was set to an appropriate range and the oxygen amount in the furnace was set to an appropriate range. Of threading conditions S and T with
Also, it can be seen that the difference in glossiness is smaller than that in the case of the sheet passing condition U which does not satisfy any of the above requirements.

[0070] Since the products manufactured under the passing conditions V to Y satisfy all of the requirements specified in the present invention, the glossiness in any of the 10 coils was 3%.
It turns out that it succeeded in suppressing below.

[0071]

The present invention is constituted as described above, and is a continuous annealing pickling line or a line for performing only pickling. A method was established in which the glossiness in the titanium plate could be made uniform and the glossiness level could be freely controlled if necessary.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing a configuration of a continuous annealing pickling line.

FIG. 2 is a diagram for explaining a immersion state of a titanium plate in an pickling tank.

FIG. 3 is a diagram for explaining a method of inverting a titanium plate.

FIG. 4 is a graph schematically showing the relationship between the pickling amount and the gloss.

FIG. 5 is a graph showing the effects of pickling amount and crystal grain size on glossiness.

Claims (8)

[Claims] In a continuous annealing pickling line or pickling line, a pickling tank having a immersion roll is passed through a plurality of times when performing pickling finishing of a titanium plate or a titanium alloy plate. A method for producing a titanium plate or a titanium alloy plate having a beautiful surface having a uniform luster, wherein the plate is operated such that the plate is appropriately inverted and passed through a pickling tank. 2. When a pickling finish is performed on a titanium plate or a titanium alloy plate having a different width in a continuous annealing pickling line or a pickling line, the difference between the width of the preceding plate and the width of the succeeding plate is equal to the width of the preceding plate. A method for producing a titanium plate or a titanium alloy plate having a beautiful surface with a uniform gloss, wherein the operation is performed so as to be 50% or less of the above. 3. When performing pickling finishing of a titanium plate or a titanium alloy plate in a continuous annealing pickling line or a pickling line, the concentration of titanium ions in the pickling solution is set to 0.1 g / l or more. A method for producing a beautiful titanium plate or a titanium alloy plate having a uniform gloss, which is characterized by operating. 4. When performing continuous pickling finishing of a titanium plate or a titanium alloy plate in a continuous annealing pickling line, operation is performed such that the oxygen content in the furnace atmosphere in the annealing furnace is 1% by volume or more. A method for producing a titanium plate or a titanium alloy plate having a beautiful surface having a uniform gloss. 5. When a titanium plate or a titanium alloy plate is pickled in a continuous annealing pickling line or a pickling line, a pickling tank having a dipping roll is passed through a plurality of times, and the titanium plate or the titanium alloy is passed through. The surface having a uniform gloss is characterized in that the plate is operated such that the plate is appropriately inverted and passes through the pickling tank, and the amount of oxygen in the furnace atmosphere in the annealing furnace is 1% by volume or more. Manufacturing method of beautiful titanium plate or titanium alloy plate. 6. When performing pickling finishing of a tan plate or a titanium alloy plate having a different plate width in a continuous annealing pickling line or a pickling line, the difference between the width of the preceding plate and the width of the succeeding plate is determined by the width of the preceding plate. A beautiful titanium plate having a uniform glossy surface, characterized in that the operation is performed such that the oxygen content in the furnace atmosphere in the annealing furnace is 1% by volume or more, and Manufacturing method of titanium alloy plate. 7. When the pickling of a titanium plate or a titanium alloy plate is performed in a continuous annealing pickling line or a pickling line, the concentration of titanium ions in the pickling solution is adjusted to 0.1 g / l or more. And a method for producing a titanium plate or a titanium alloy plate having a beautiful surface having a uniform gloss, wherein the operation is performed such that the oxygen content in the furnace atmosphere in the annealing furnace is 1% by volume or more. 8. When performing pickling finishing of a titanium plate or a titanium alloy plate having a different width in a continuous annealing pickling line or a pickling line, the following requirements (a) to (d) are satisfied. A method for producing a beautiful titanium plate or a titanium alloy plate having a uniform gloss, which is characterized by operating. (A) A pickling tank having a dipping roll is passed through a plurality of times, and a titanium plate or a titanium alloy plate is appropriately inverted to pass through the pickling tank. (B) The width difference between the preceding plate and the following plate is 50% of the width of the preceding plate.
It will be as follows. (C) The concentration of titanium ions in the pickling solution is adjusted to 0.1 g / l or more. (D) The amount of oxygen in the furnace atmosphere in the annealing furnace is adjusted to 1% by volume or more.