JPS61281864A - Stainless steel strip provided with temper color and its manufacture - Google Patents

Abstract

PURPOSE:To obtain a mass-producible colored stainless steel strip having satisfactory corrosion resistance and causing hardly surface cracking by blowing hot air on a stainless steel strip under prescribed conditions so as to color the surface of the steel strip by the formation of oxide scale. CONSTITUTION:A stainless steel strip is passed through a hot air circulation type drying furnace, where hot air is blown on the surface of the steel strip at 300-800 deg.C to heat the steel strip for 60-180sec. Oxide scale is formed on the surface of the steel strip by the heating to color the surface.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a stainless steel strip that has been given a temper color by forcibly generating oxide scale on the surface of the stainless steel strip, and a method for manufacturing the same (compared to the conventional technology). ) Conventionally, microwave oven lining materials or tar/table materials,
For open lining materials heated by electricity or gas,
Stainless steel strips with ordinary metallic luster are sheared or worked. For example, in the case of a microwave oven,
Under its use environment, stainless steel material is 200-900℃
The surface of the material was oxidized and discolored without staining.

(Problems to be Solved by the Invention) When a stainless steel strip used as a material for equipment is used while being heated, the color of the material surface changes, and the change is non-uniform. This not only spoils the aesthetic appearance of equipment made of this material and gives the user a sense of uncleanliness, but also makes the user feel distrustful of the material and, ultimately, of the equipment itself.

Conventionally, as a method for temper coloring the steel strip used in cases where the steel strip is not tempered, the surface of the steel strip is immersed in a 300mm, 500Y', F force and 500Y', and the surface of the steel strip is immersed in a solvent. A method of producing tempered color is known,
Temper coloring of steel strips has been carried out using this method; however, the cost of temper coloring is high due to the use of expensive slugs and the need to thoroughly remove the slugs that have adhered to the surface of the steel strip. Since metallic zinc roll is used, the surface of the steel strip is easily scratched, θ It is necessary to be very careful when handling the hot salt, and workability is poor; There were problems such as heat diseconomies.

Therefore, the present invention prevents the stainless steel strip used as a material in a heated usage environment from causing uneven color changes during use and impairing the aesthetic appearance, giving the user a feeling of uncleanness or distrust. It is designed to withstand long-term use, while solving the problems of conventional manufacturing methods and providing material properties that satisfy processors and users without major changes in material properties such as mechanical properties. The purpose is to provide a method that can be easily mass-produced at low manufacturing costs.

(Means for Solving the Problems) The present invention achieves the above object, and provides a stainless steel strip with a temper color, which is colored by oxide scale generated on the surface of the stainless steel strip. It is characterized by this.

In addition, as a manufacturing method, a stainless steel strip is passed through a hot air circulation type drying oven, and the surface of the steel strip is heated to 300 to 800℃.
It is characterized in that it is heated by blowing hot air of 60 to 180 degrees and is colored by the oxidized scale generated on the surface.

(Function) In order to achieve the above object, in the present invention, a stainless steel strip of steel type 5US304, 8US430, etc., which has been subjected to tempering, continuous annealing, or polishing, is placed in a hot air circulation drying oven. The steel strip is threaded and hot air is blown onto the surface of the steel strip to sufficiently develop a temper color, and at the same time it is forcibly (intentionally) oxidized very lightly to produce oxide scale on the surface and color the steel strip.

By sufficiently developing the temper color in this way, the stainless steel strip used as a material is prevented from causing uneven color changes (color unevenness) in a heated environment.

When hot air is blown onto the surface of a stainless steel strip in a hot air circulation drying oven to heat it, a temper color (temper color) that develops and colors depending on the steel type, heating temperature and time, and heating atmosphere.
Since there are differences in color (color), it is necessary to set conditions according to the requirements.

SUB 304.5U is a typical stainless steel type.
Heating temperature and temper color of S430 stainless steel strip (
Table 1 shows the relationship between color and color.

As shown in Table 1, the surface finish of the stainless steel strip passed through the furnace is 2B, and the heating time in the furnace is 1.
When the temperature is fixed at 20 sec, there are various differences in temper color depending on the steel type and heating temperature.We have carefully considered the maximum heating temperature that the material will receive and set the conditions according to the request so as not to cause color unevenness. It must be set.

(Note) 1. The surface finish of all stainless steel strips is 2B.
It is.

2. Heating time is 120 formula.

Further, this heating is different from the annealing treatment normally carried out in the manufacturing process of stainless steel strips, and is carried out only to impart a temper color to the surface of the steel strip. Therefore, this heating will not change the material properties such as the mechanical properties of the stainless steel strip. , stainless steel strips already have material properties that satisfy processors and users and have been given a surface finish at the material stage where they are heated and given a temper color (starting material stage). The heating conditions must be set to impart temper color so as not to change the color.

The heating temperature as this heating condition varies depending on the steel type, but it is preferably set below the transformation point. Heating temperature 300~
A stainless steel strip with the required temper color can be obtained by appropriately changing the heating conditions within the heating condition range of 800° C. and heating time of 60 to 120 seconds.

Furthermore, the surface finish of the material before it passes through the furnace is numbered as described above, annealed and pickled.
D, 2B, No. 4 and HL subjected to skin pass rolling
Any type of material that has been subjected to a polishing process, such as the following, may be used.

(Example) As raw materials, steel strips with a 2B finish of steel type 5US304 and SUB 430 were passed through a hot air circulation type drying oven shown in FIGS. 1 and 2.

In the figure, 1 is a furnace body, 2 is a burner, 3 is a circulation fan, 4 is an exhaust fan, 6 is a hot air outlet, 9 is an outside air suction port, and 10 is a furnace air suction port.

The air and furnace hot air sucked in by the circulation fan 3 from the outside air suction port 9 and the furnace air suction port 10 are heated by the burner 2, and are moved up and down so as to sandwich the stainless steel strip material 8 being passed through the furnace. The hot air is blown out from a plurality of hot air blowing ports 6. A portion of the hot air is exhausted to the outside of the furnace by the exhaust fan 4, but is sucked in through the furnace air suction port 10, and the hot air is circulated in exactly the same cycle. In order to supply clean hot air into the furnace, the fuel for the burner 2 is preferably L'BG such as propane/butane.

The stainless steel strip material 8 is passed through the furnace at a predetermined speed via the support roll 7, and is blown out while passing between a plurality of hot air outlets 6 provided above and below in the furnace. The material 8 is heated by the hot air, causing oxidized scale to form on the surface of the material 8 and coloring it.

In this way, in the present invention, stainless steel strip (material)
By blowing hot air on the material, the surface of the material is oxidized,
Coloring with oxide scale, that is, temper color treatment is performed.

Specifically, steel strip material with 2B finish of steel types 5US304 and 5US430 00.8"'X 100 (FX OMn
When the material was passed through a hot air circulation drying oven under the heating conditions shown in Table 2, a stainless steel strip with a yellow (golden) temper color with no unevenness was obtained.

In addition, as a result of investigating the mechanical properties of these steel strips before passing them through the furnace and after passing them through the furnace, no changes were observed as shown in Table 3. As a result of investigating the corrosion resistance before and after passing through the furnace, as shown in Table 4, there was no significant difference in corrosion resistance.

Table 4 (Effects) As described above, the present invention achieves the above object and has the following effects.

■ Temper color that does not cause uneven color changes during use as a material for equipment and impairs the aesthetic appearance, has good corrosion resistance, and can withstand long-term use without giving the user a feeling of being dirty or distrustful. This is a stainless steel strip.

■ Compared to the conventional temper color treatment using salt path immersion, it is easier to work with and does not cause scratches on the surface of the steel strip.
This is a manufacturing method that allows for easy production at low production costs, since it is not necessary to enclose expensive salt and the large amount of fuel consumed in melting it.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of a hot air circulation type drying oven used as an embodiment of the present invention, and FIG. 2 is a schematic front view of FIG. 1. 1: Furnace body 2: Burner 3: Circulation fan 4: Exhaust fan 5: Furnace body opening 6: Hot air blowout lower: Support roll 8 Stainless steel strip material 9: Outside air suction port 10: Furnace air suction port

Claims (1)

[Claims] 1) A stainless steel strip provided with a temper color characterized by being colored by oxide scale generated on the surface of the stainless steel strip. 2) Pass the stainless steel strip through a hot air circulation type drying oven, and blow hot air at 300 to 800°C onto the surface of the steel strip for 60 degrees.
A method for producing a stainless steel strip with a temper color, which is characterized by heating for ~180 seconds and coloring with oxide scale generated on the surface.