JPH0774460B2 - Chemically developed stainless cold-rolled steel sheet with excellent antiglare property and method for producing the same - Google Patents

Description

TECHNICAL FIELD The present invention relates to a chemically colored stainless steel cold rolled steel sheet having excellent antiglare properties, which is useful as a material for building materials and the like, and a method for producing the same.

[Conventional technology]

Today, it has excellent corrosion resistance, weather resistance, chemical resistance and heat resistance as materials for roofs, ceilings, building materials such as walls and interior and exterior panels, elevators, vehicle materials, vanities, bathtubs, kitchens, etc. Colored stainless cold-rolled steel sheets, which have a good impact resistance, a good appearance, and a chemical color-hardening film that hardly discolors or fades, are widely used. And
This colored stainless cold-rolled steel sheet is originally made of stainless steel with good corrosion resistance, and unlike the coating coloring on the surface, the surface of the stainless steel can be seen, and the background has a color tone that is fully utilized and the angle of view and light It is being sold as a high-grade colored stainless steel design steel sheet that has a chemically colored cured film that changes its color tone.

As a method of coloring a stainless steel plate, a method of applying a paint or a method of applying a plating has been widely known, but recently, a method of coloring by a chemical coloring method has also been carried out on an industrial scale. ing. The coloring principle of this chemical coloring method is that in a coloring liquid in a coloring tank that stores a coloring liquid composed of a mixed acid of sulfuric acid and chromic acid or chromate,
While continuously immersing the stainless steel strip in the coloring liquid through the semi-immersion roll on the entry side where a part of it is immersed, by oxidizing the surface layer of the stainless steel sheet, it is possible to form a film with a thickness of several thousand angstroms mainly composed of oxides of Fe and Cr. The purpose is to form a thick oxide film, that is, a thin transparent chemical coloring film, and to develop a color by the interference action of the reflected light from the surface of the oxide film and the reflected light from the interface between the oxide film and the metal base.

Materials used for the above-mentioned applications include molding, welding, and exposure to the atmosphere, so that corrosion resistance, weather resistance, chemical resistance, heat resistance, workability, impact resistance, weldability,
In addition to being required to have excellent strength, etc., the product is used in parts that are always visible to the human eye, and the quality of the product is evaluated visually, so not only is the appearance visually beautiful, Using the stainless steel material, the property that does not make human eyes feel dazzling and does not give fatigue due to the dazzling property (anti-glare property), and conversely to the description of the colored stainless steel design steel plate described above. However, it does not make the material feel, that is, it cannot distinguish what the material is, it is not very noticeable even if dirt or dust adheres to the surface, and it can be easily washed even if it adheres (cleanability ) Etc. are required to be excellent.

Now, a general method for producing a colored stainless steel cold-rolled steel sheet which has been used for such an application will be described. Japanese Patent Laid-Open No. 48-1124, which has been conventionally developed by International Nickel Co. in England and is called the Inco method.
Utilizing the coloring technology disclosed in No. 3 and No. 49-21339, etc., for example, a batch of stainless cold-rolled steel sheet products with surface finish such as No. 4, HL, BA shown in JIS G4305, that is, cut sheet products. It was produced by coloring and curing depending on the treatment method.

However, recently, based on this Inco method, for example,
53-34636, 54-10245, 54-134177, 57-587
7 and 58-16778, 60-2696, 60-22065, and other continuous coloring and curing technologies (continuous chemical color-curing method), as shown in the manufacturing process schematic diagram of FIG. A continuous coloring and hardening process is placed at the end of the strip steel and steel plate manufacturing process, and a wide range of stainless steel strips with various surface finishes are continuously threaded through this process. Can be manufactured.

Thus, the colored stainless steel cold-rolled steel sheet obtained by the conventional manufacturing method had the above-mentioned properties and satisfied a considerable part of the above-mentioned requirements as a material for each of the above-mentioned applications. .

[Problems to be solved by the invention]

However, such a colored stainless cold-rolled steel sheet obtained by the conventional manufacturing method has an appropriate luster on its surface due to the luster of the surface finish of the cold-rolled stainless steel strip and the steel sheet surface. It has a beautiful and good appearance, but on the other hand, sunlight and illumination rays are easily reflected, leaving a problem that it is very dazzling and tires the eyes. Didn't.

In addition, in a part where such a colored stainless steel cold-rolled steel sheet is used or in a purpose for which it is used, a stainless steel material which is required to have a considerable portion of the above-mentioned characteristics, but which is still glossy It is required that the material does not feel even if it is used, i.e., it cannot be distinguished from other materials, in other words, it has a deep aesthetic color with no surface gloss unlike the conventional colored stainless cold-rolled steel sheet with gloss. However, there was a problem of not satisfying such demand.

[Means for solving problems]

The present inventors have solved the above-mentioned problems, and have a chemically colored stainless steel cold-rolled steel sheet having anti-glare property on the surface and having a glossy and deep color tone, and a method for producing the same by a continuous chemical coloring mass production method. As a result of research for the purpose of providing, a stainless cold-rolled steel sheet having a non-oriented specific roughness surface may be used as a material for such a colored stainless cold-rolled steel sheet. The present invention has been completed by previously clarifying that the object can be achieved by performing light rolling under specific conditions.

That is, one aspect of the present invention is that at least one surface has a color-developing film formed by a chemical color-hardening method on the surface of a stainless cold-rolled steel sheet having a roughness of 10 to 12 average roughness Rz of 4 to 12 μm. The present invention relates to a chemically colored stainless steel cold rolled steel sheet having excellent antiglare properties.

Also preferably, the material of the chemically colored stainless cold rolled steel sheet is
It is characterized by being SUS304 stainless cold rolled steel.

Still another one of the present invention is, in producing a chemically-colored stainless cold-rolled steel sheet by each process including cold rolling, annealing pickling, light rolling and chemical color hardening, performing difficult rolling before chemical color hardening. This rolling pass is lightly rolled at a rolling reduction of 0.1 to 0.6% using a rolling work roll having a surface roughness obtained by dulling a non-directional ten-point average roughness Rz of 10 to 25 μm,
The present invention relates to a method for producing a chemically colored stainless steel cold rolled steel sheet having excellent antiglare properties, which is characterized by a chemical color hardening treatment.

Further preferably, the material for the chemically-colored stainless cold-rolled steel sheet is continuously polished by a polishing belt after the cold rolling and before the annealing and pickling.

Still more preferably, when the material of the chemically colored stainless steel cold-rolled steel sheet is cold-rolled, or after this rolling, continuous surface polishing is performed and then annealing pickling is performed, the material is annealed to a soft material having a grain size of 5 μm or less. It is characterized by

Still more preferably, the light rolling is characterized in that it is carried out in a temper rolling mill incorporating a dull-worked large-diameter rolling work roll.

[Description of configuration]

Hereinafter, the present invention will be described in detail with reference to the drawings while adding preferred embodiments.

FIG. 1 is a diagram showing the relationship between the antiglare property imparted to a chemically colored stainless steel cold-rolled steel sheet according to the present invention and the roughness of the surface of the stainless steel cold-rolled steel sheet, which is the raw material, and FIG. FIG. 3 is a diagram showing the relationship between the roughness of the surface of the cold-rolled stainless steel sheet as a raw material and the rolling conditions (the roughness of the surface of the rolled work roll, the reduction ratio) in the manufacturing method of the present invention.

First, the chemically colored stainless cold rolled steel sheet according to the present invention will be described.

At least one surface is non-directional and has a color-developing film by a chemical color-hardening method on the surface of a cold-rolled steel sheet that is dull-processed to have a roughness of 10-point average roughness Rz4 to 12 μm specified in JIS B0601 (1982). It is a colored stainless cold-rolled steel sheet.

This color forming film is formed by the continuous color curing technology (continuous chemical color curing method) disclosed in each of the publications introduced in the prior art.
Is formed on the surface of the cold-rolled steel sheet of the material, and has various color tones (blue, gold, red, green, etc.) that change depending on the viewing angle due to refraction and interference of light. The surface texture of the cold-rolled steel sheet, which is the material, can be seen through the colored film.

That is, the colored stainless cold-rolled steel sheet utilizes the property of making the background of such a material visible, and finishes the background of the cold-rolled steel sheet, which is the material, to a dull surface with a specific roughness without directionality,
Since this surface is seen through, there is no reflection on the surface, antiglare properties are imparted, the material cannot be discriminated, and it is possible to obtain a design steel plate with no gloss and a deep aesthetic color tone. The degree of dulling, that is, the surface roughness, of the surface of the cold-rolled steel sheet of the material from which sufficient antiglare property is obtained can be obtained from FIG. FIG. 1 shows a colored stainless cold-rolled steel sheet in which the coloring film is formed on the surface of a material which has no directionality and is dull-processed to have various surface roughnesses, according to its antiglare property.
B, C (A>B> C, where A is the passing level) are divided into ranks, the vertical axis indicates surface roughness, the horizontal axis indicates A, B, C ranks, and the corresponding number of points is plotted. It is shown. It is understood from FIG. 1 that the anti-glare property of pass rank A and the like are all given when the surface roughness is 4 μm or more. If the surface roughness is high, it is not so. From the viewpoint of providing a glossy and deep color tone, the observation result is 15 μm or less, preferably 12 μm or less. When the surface roughness is extremely increased, the color tone in one steel sheet may lack uniformity, which is not suitable as a design steel sheet, and conversely, the antiglare property may disappear.

Next, a method of manufacturing such a colored stainless cold-rolled steel sheet by a continuous coloring mass production method will be described with reference to the process schematic diagram of FIG.

In the production method of the present invention, for example, cold rolling material such as SUS304 stainless cold rolled steel, annealing pickling, cold rolling,
Light rolling is performed under specific conditions before passing through the continuous continuous chemical color development hardening process, which has been performed through the usual manufacturing processes of ordinary cold-rolled stainless steel such as annealing pickling.

As mentioned above, this light rolling is performed on the surface of the cold-rolled strip steel, which is a material for the colored stainless steel cold-rolled steel sheet, with a non-oriented ten-point average roughness.
The rolling condition is shown in FIG. 3, which is carried out for dulling to a roughness of Rz 4 to 12 μm. FIG. 3 shows a rolled work roll having a surface roughness dulled to a non-directional ten-point average roughness Rz of 10 to 25 μm in order to obtain a cold-rolled steel strip material having such a dulled surface roughness. It indicates that the material may be rolled with a light reduction (0.1 to 0.6%).

The elongation rate in such light rolling is approximately the same as the rolling reduction rate. It is said that if the surface roughness of the stainless steel exceeds 2 μm, the physical properties may be deteriorated depending on the treatment method. However, as will be described later, the present invention has a surface roughness of about 12 to 15 μm. It can be used up to roughness.

However, rolling rate (%) = {(H-h) / H} x 100 H: Sheet thickness before rolling (mm) h: Sheet thickness after rolling (mm) In this way, the dull processing is applied and the appropriate surface A material having roughness is passed through the next continuous chemical color hardening process, and further subjected to a trimming process such as slitter treatment, shearing treatment, shape correction treatment, and the like, and then colored stainless cold-rolled steel strip or colored stainless cold-rolled steel plate is obtained. Is commercialized as.

In such a manufacturing method of the present invention, rather than removing the ground marks on the surface of the material, it is possible to uniformly form the dull-processed material surface without causing color unevenness in the continuous chemical color-curing step, which is the main post-step. It is desirable that the raw material is continuously surface-polished by a polishing endless belt before the annealing pickling after the cold rolling in the previous step so that the material is chemically colored and hardened.

Further, at the final stage of the manufacturing process of the present invention shown in FIG. 2, cold rolling of dull working is performed even though it is light rolling.
After that, the material is commercialized without performing the annealing treatment, so that the raw material is processed and hardened to be the product. The commercialized colored stainless cold-rolled steel strip or colored stainless steel cold-rolled steel sheet is subjected to forming such as bending, but if a hard product that is still work hardened against this processing is unsatisfactory, this light It is desirable to anneal the cold-rolled steel strip, which is a raw material, to a soft material having a grain size of 5 or less specified in JIS G0551 and G0552 in an annealing pickling step before rolling.

Furthermore, this light rolling is not carried out by selecting a special rolling model, but it is a rolling process with a light reduction ratio, and the shape of the material at the final stage of the manufacturing process does not cause surface flaws. It is preferable to use a temper rolling mill incorporating a rolling work roll having a relatively large diameter and having the surface roughness dulled, for the reason that it can be made even better.

〔Example〕

The product of the present invention and the manufacturing method thereof will be described in more detail with reference to the following examples.

A SUS304 hot-rolled steel strip (material for cold rolling) with a dimension of 3.8 mm and a width of 1030 mm was annealed and pickled to improve the hot-rolled material, remove rolling strain and remove surface oxide scale. . Next, cold rolling was performed, and annealing pickling was performed to remove work hardening and rolling strain caused by this rolling and improve the material. This annealing pickling uses a catenary annealing furnace that is an atmospheric anneal, and the pickling uses a mechanical oxide scale crushing removal means such as a scale breaker or shot blast, and electrolytic pickling using an electrolyte of acid or salt. It was carried out by a method that requires a low running cost, such as chemical oxide scale removal means such as a molten salt or pickling with various acids.

Such cold rolling and annealing pickling are repeated as necessary to roll to a required plate thickness of 0.4 mm as a product, and at the time of final annealing pickling, soft annealing is performed so that the material becomes a soft material of grain size 5. I did. Prior to the softening and annealing, the surface of the material was lightly polished using a polishing endless belt while applying polishing oil in a finishing polishing equipment.

This material is used in a temper rolling mill with a diameter of 750 mm.
With a rolling work roll that has no directionality and has a ten-point average roughness Rz of 20 μm and is dull-processed, the reduction rate is 0.3%.
As a result of 1 pass rolling at
A cold-rolled steel material that was dull processed to 7.8 was obtained.

This dull-processed material with appropriate surface roughness is continuously passed through the main chemical color hardening process to adjust the concentration and temperature of the electrolyte in the acid solution, the current density to the material, the running speed and the immersion time. As a result, it was possible to obtain a colored stainless cold-rolled steel strip having a color-developing film having a dark red color tone as desired without any color unevenness.

Finally, the colored stainless cold-rolled steel strip was put into a refining step, subjected to slitting or shape correction processing to give a colored stainless cold-rolled steel product, and the rest was sheared to give a colored stainless cold-rolled steel sheet product.

The former is a roofing material that has no surface reflection and is provided with anti-glare properties, and is required to have a glossy and deep dark red color tone, while the latter is an interior / exterior with similar requirements. It could be used as a panel material.

〔effect〕

As described above, the chemically colored stainless steel cold rolled steel sheet of the present invention is
As a matter of course, the stainless steel has various characteristics that should be generally possessed as a design steel sheet that is a material for various applications, but stainless steel that has no surface reflection and is provided with antiglare property and generally has gloss Although it is made of steel, it does not feel the material, and unlike conventional chemical-colored stainless steel cold-rolled steel sheets with a glossy surface, it has new properties that give it a calm, deep-looking color tone with no surface gloss. It can be

Since the coloring by chemical coloring according to the present invention is an interference color, compared with coloring by coating, not only the appearance is different, but also the adhesion to the substrate is good, there is almost no fading, and welding work is easy. is there.

And, in the manufacturing method, such a new property can be added easily and stably at low cost with high productivity.

Due to such excellent surface properties of the product, the present invention expands the field of use of stainless cold-rolled steel sheet and greatly contributes to the sales expansion thereof, and its industrial value is extremely large.

[Brief description of drawings]

FIGS. 1 to 3 relate to a chemically-colored stainless cold-rolled steel sheet according to the present invention and a method for producing the same, and FIG. 1 shows anti-glare properties imparted to the chemically-colored stainless cold-rolled steel sheet and materials thereof. FIG. 2 is a diagram showing a relationship with the surface roughness of the stainless cold-rolled steel sheet, FIG. 2 is a process schematic diagram of the manufacturing method, and FIG. 3 is a rolling condition of light rolling for dulling the surface roughness of the stainless cold-rolled steel sheet as a raw material. It is a figure which shows the relationship with (surface roughness of a rolling work roll, reduction rate). FIG. 4 is a schematic view of a manufacturing process of a conventional chemically-colored stainless cold-rolled steel sheet.

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-49-15642 (JP, A) JP-A-56-121947 (JP, A) JP-A-59-23824 (JP, A) JP-A-61- 227193 (JP, A) JP-A-63-213680 (JP, A)

Claims (6)

[Claims] 1. A cold-rolled stainless steel sheet having a ten-point average roughness Rz of at least one surface and a roughness of 4 to 12 μm, at least one surface of which is provided with a color-forming film formed by a chemical color-hardening method. Chemically colored stainless steel cold rolled steel sheet with excellent anti-glare properties. 2. The chemically colored stainless steel sheet is SUS3.
04 Chemically colored stainless steel cold rolled steel sheet having excellent antiglare property according to claim 1, which is a cold rolled stainless steel sheet. 3. When producing a chemically-colored stainless cold-rolled steel sheet by each step including cold rolling, annealing pickling, light rolling and chemical color hardening, difficult rolling is performed before chemical color hardening,
This rolling pass has a non-directional ten-point average roughness Rz of 10 to 25μ.
Cold rolling of chemically colored stainless steel with excellent anti-glare property, characterized by light rolling at a rolling reduction of 0.1 to 0.6% using a rolled work roll having a surface roughness dulled to m, and then chemically colored and cured. Steel plate manufacturing method. 4. The antiglare property according to claim 3, wherein the material of the chemically-colored stainless cold-rolled steel sheet is continuously polished by a polishing belt after cold rolling and before annealing and pickling. A method for producing a cold-rolled stainless steel sheet with excellent chemical coloring. 5. A material of a chemically-rolled stainless steel cold-rolled steel sheet is cold-rolled, or when this rolling is followed by continuous surface polishing and annealing pickling, the material is annealed to a soft material having a grain size of 5 μm or less. The method for producing a chemically colored stainless steel cold-rolled steel sheet excellent in antiglare property according to claim 3 or 4, characterized in that. 6. Light rolling is carried out by a temper rolling mill incorporating a dull-worked large-diameter rolling work roll, as claimed in any one of claims 3 to 5. The method for producing a chemically colored stainless steel cold rolled steel sheet having excellent antiglare property according to any one of the above.