JPH05302A - Production of stainless steel foil having excellent cylindrical winding property - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] Stainless steel foil used for heat insulation or insulation coating during air-conditioning work is difficult or difficult to wind due to "pegs" and repulsion during cylindrical winding. Therefore, a simple method for manufacturing a stainless steel foil having excellent cylindrical winding property is established. [Structure] When a stainless foil with a thickness of 200 μm or less is made to have a thickness (μm) and Vickers hardness (Hv) in the shaded area surrounded by points A, B, C and D in the figure, it is always stable. Since the cylindrical wrapping property is good, the final stainless steel plate after the final rolling process is further rolled to 200 μm.
In producing the following stainless steel foil, the rolling reduction of the rolling process was controlled within the range of 2 to 90% so as to obtain the plate thickness (μm) and Vickers hardness (Hv) in the shaded area of FIG. 1. To do.

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 stainless steel foil having an excellent cylindrical wrapping property, and particularly to a stainless steel foil having a plate thickness of 200 μm or less, which is used in a construction material department involving air conditioning work.

[0002]

2. Description of the Related Art Stainless steel foil with a thickness of 200 μm or less is
Unlike thick stainless steel plate, it is flexible and has the advantage that it can be wound around a pipe or pole of about 50 mmφ without plastic deformation. Stainless steel foil is widely used in the field of building materials such as coating of cylindrical materials such as heat-insulating pipes or heat-insulating cylinders, taking advantage of stainless steel's inherent characteristics such as corrosion resistance and heat resistance.

However, although the stainless steel foil has the above-mentioned advantages, it has the following problems when wound around a cylindrical material. (B) When wound around a cylindrical material, there is a so-called "peco fold" in which the foil does not break and does not recover, resulting in a poor external appearance that cannot be used as a building material. (B) When wound around a cylindrical material, it may be difficult to wind it because the repulsive force is too strong.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a conventional stainless steel foil having a plate thickness of 200 μm or less when winding it around a cylindrical material, which is a drawback of the above-mentioned prior art, such as "peco fold". It provides an effective method for producing stainless steel foil having excellent cylindrical wrapping property by eliminating "defective wrapping property", causing no breakage in application to the building material department, and causing no structural defects such as resilience. Especially.

[0005]

The gist of the present invention is as follows. That is, in a method for manufacturing a stainless steel foil having a plate thickness of 200 μm or less by further applying a rolling process to a stainless steel plate that has undergone the usual final rolling process, the plate thickness (μm ) And Vickers hardness (Hv), the rolling reduction of the rolling process is controlled to 2 to 90%, and a method for producing a stainless foil having excellent cylindrical winding property. Note x axis: Stainless steel foil thickness (μm) y axis: Vickers hardness (Hv) after rolling of stainless steel foil A coordinate: (x, y) = (30,500) B coordinate: (x, y) = (30,350) C coordinate: (x, y) = (200,180) D coordinate: (x, y) = (200,330) That is, in FIG. 1, the area surrounded by the point ABCD and shaded The rolling reduction ratio is 2 to 90% so that the plate thickness (μm) and Vickers hardness (Hv) of the stainless steel foil become
To control.

The results of experiments conducted by the present inventors to obtain the present invention will be described. That is, the inventors of the present invention have predicted that the cylindrical wrapping property of the stainless steel foil may be related to the thickness and hardness of the foil. (H
The results of various tests of v) are shown in FIG. That is, in the region above the straight line AD in FIG. 1, since the Vickers hardness (Hv) of the stainless steel foil is too hard when wrapped around the cylindrical material, the repulsive force is strong and it is difficult to wind the straight line BC. In the area below the line, it was found that the stainless steel foil "peaked" and became unaesthetic and could not be used as a building material. Further, when the plate thickness of the stainless steel foil exceeds 200 μm, it has been conventionally confirmed by the present inventors in daily work that the foil is too thick and the cylindrical winding property is poor. The thickness of 30 μm is the limit thickness that can be reached from the current state of the art. Therefore, it was found that the cylindrical winding property was excellent only in the region surrounded by the point ABCD and shaded in FIG.

Therefore, it will be described below whether there is the following method for providing the plate thickness (μm) and the Vickers hardness (Hv) in the area surrounded by the point ABCD in FIG.
Normal stainless steel foil is finished by rolling and annealing, but there are the following two methods for imparting Vickers hardness in the region to the finished stainless steel foil having a plate thickness of 200 μm or less. (A) Method of controlling the rolling reduction by rolling (b) Method of controlling the annealing temperature by annealing However, it takes time to change the continuous annealing temperature of the stainless steel foil, and it is difficult to control it. Since the method of controlling the rolling reduction by means of the existing rolling equipment can be used as it is and the control is easy, in the present invention, (a)
It was decided to use the rolling method. Therefore, by further rolling the stainless steel sheet that has undergone the usual final rolling process, the rolling reduction is controlled to 2 to 90%, so that the sheet thickness (μm) and the Vickers hardness in the shaded area in FIG. It was confirmed that the combination of the height (Hv) can be easily obtained. The reason for limiting the control range of the rolling reduction to 2 to 90% when the rolling process is further applied to the original plate of the stainless steel plate is as follows.
This is because, when the reduction ratios are lower than 2% and higher than 90%, which are the upper and lower limits determined by the experiment by the inventors to put them in the shaded region of FIG.

[0008]

[Example] Repeated rolling and annealing, JIS standard SUS
304 was used as a test material and rolled at various reduction ratios to obtain stainless foils having various Vickers hardnesses, and the cylindrical wrapping properties of these stainless foils were tested. The results are shown in Table 1. The evaluation of the cylindrical wrapping property in Table 1 was divided into "peco-folding" defect and repulsion property and evaluated as follows. (A) Peck break ○: Not broken when wrapped in a cylinder. Marked x: Broken when wrapped in a cylinder. (B) Repulsive force ○: Repulsive force has almost no repulsive force and can be easily wound into a cylinder. ×: Repulsion is strong and it is difficult to wind the cylinder. That is, the cylindrical wrapping property is evaluated to be good in the case of both "peco-folding" and the resilience when marked with "O", and any of the marks marked with "X" is evaluated to be defective. Therefore, both “peco-fold” and repulsive property are marked with ○, which is sample material No. 2,
No.5, No.8, No.11, No.14, No.17
Clearly falls within the shaded area in FIG. 1, and the other test materials are outside the shaded area, which clearly does not meet the requirements of the present invention.

Although the above test was carried out on a cylinder wound in a direction perpendicular to the rolling direction, almost the same results were obtained in winding in the direction parallel to the rolling direction. The present inventors further
A similar test was performed for IS standard SUS430, but almost the same results as in FIG. 1 were obtained.

[0010]

[Table 1]

[0011]

The reduction ratio of 2 to 90 is set so that the combination of the final thickness and the Vickers hardness of the stainless foil having the thickness t of 200 μm or less according to the present invention falls within the shaded area shown in FIG. By performing the controlled rolling process within the range of%, it was possible to manufacture a stainless steel foil having an excellent cylindrical winding property, and as a result, the following effects could be achieved. (A) When wound around a cylindrical building material, it can be wound smoothly without causing folds or defects such as repulsion. (B) Due to the effect of (a), in the building materials department, the flexibility of the foil, which is the greatest feature, is utilized, making it easy to wind around a heat insulation pipe or a heat insulating tube, and to prevent the stainless steel from having the inherent corrosion resistance.
It has become possible to exhibit heat resistance characteristics. (C) The present invention can be applied to all stainless steel foils regardless of steel type, as long as they are ordinary stainless steel foils. (D) At the construction site, before using the unknown stainless foil or newly purchased stainless foil, the thickness t
By measuring the Vickers hardness, it is possible to easily determine the quality of the cylindrical wrapping property.

[Brief description of drawings]

FIG. 1 is a diagram showing a relationship between a cylindrical wrapping property and a plate thickness (μm) and a Vickers hardness (Hv) in a stainless steel foil according to the present invention, the foil having a plate thickness in a shaded region and a Vickers hardness. Indicates that the cylindrical wrapping property is good, and other regions are poor.

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[Procedure amendment]

[Submission date] June 29, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Title of invention

[Correction method] Change

[Correction content]

Title: Method for producing stainless foil having excellent cylindrical winding property

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuzo Fukunaga 2-88 Wakihama Kaigan Dori, Chuo-ku, Kobe-shi, Hyogo Kawasaki Steel Co., Ltd. No. 88 Wakihama Kaigan Dori Kawasaki Steel Co., Ltd.

Claims (1)

Claim: What is claimed is: 1. In a method for producing a stainless steel foil having a plate thickness of 200 μm or less by further applying a rolling process to a stainless steel plate that has been subjected to a normal final rolling step, a point ABCD at a xy coordinate below. A stainless foil excellent in cylindrical wrapping property, characterized in that the rolling reduction of the rolling process is controlled to 2 to 90% so as to have a plate thickness (μm) and Vickers hardness (Hv) in an enclosed area. Manufacturing method. Note x axis: Stainless steel foil plate thickness (μm) y axis: Vickers hardness (Hv) after rolling of stainless steel foil A coordinate: (x, y) = (30,500) B coordinate: (x, y) = (30,350) C coordinate: (x, y) = (200,180) D coordinate: (x, y) = (200,330)