JPS6260164B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for manufacturing a stainless steel plate having a fine and uniformly polished surface. JIS G is the polishing finish for stainless steel plates.
4305 (cold rolled stainless steel plate) or JIS G
As specified in 4307 (cold rolled stainless steel strip), there are various types such as No. 3 and No. 4, but it is desirable that the polished surface be fine and uniform in appearance, and depending on the application, In some cases, such a polished surface was required. By the way, the conventional polished stainless steel plate is as follows.
It was manufactured using process (1) or (2), but when attempting to manufacture fine and uniformly polished stainless steel sheets using these processes, it is necessary to use a paper belt with uniform abrasive grains and grain size during polishing. was considered the most ideal. (1) Cold rolling → annealing → pickling → temper rolling → polishing (2) Cold rolling → annealing → pickling → polishing → temper rolling However, the belt life of paper belts is about one hundredth that of cross belts. Because of the problems of being extremely short, having poor manufacturing efficiency and extremely high manufacturing costs, it has not been used much in the past, and cross belts have generally been used. On the other hand, when polishing with a cross belt, the abrasive grains of the cross belt are large and the particle size varies widely, so the polished surface is usually rough and the polishing scratches are uneven, but it is not possible to obtain a fine and uniform finished surface. It wasn't something. In particular, when the polishing step is the final step, as in step (1) above, the polished surface becomes the appearance of the product, which may cause problems depending on the application. Also, even if you use a cross belt, the above (2)
In the case of the process, temper rolling is performed after polishing, so the convex parts of the polishing scratches are crushed by rolling, and the polished surface becomes slightly finer. However, in this case, the elongation rate of temper rolling has an effect on the physical properties of the product. Considering this, it cannot be made too large, and the maximum limit is about 2 to 3%, and it is impossible to make the concavities of polishing scratches uniform by rolling, so there is a limit to making the polished surface fine and uniform. Was. The present invention provides a method for manufacturing a stainless steel plate that can produce a fine and uniform polished surface even when polishing is performed using a cross belt as in the conventional method. The present invention involves polishing a stainless steel plate after cold rolling it,
This is a method for manufacturing stainless steel sheets that forms a fine and uniformly polished surface by subsequently annealing and pickling, and then temper rolling if necessary. A conventional cross belt with a large diameter can be used satisfactorily. That is, in the polishing process of the present invention, polishing scratches are formed by the cross belt, etc., but when viewed microscopically, these polishing scratches are very sharp polishing scratches, and their depth is uneven. The surface roughness of the surface is rough as before. However, if scale is generated by annealing after polishing and then removed by pickling, the convex parts of the polishing scratch where the scale is particularly noticeable will fall off or dissolve and become lower, making the polishing scratch smoother and The depth is also made uniform, resulting in a fine and uniform polished surface when viewed macroscopically. In addition, the stainless steel plate manufactured in this way has the scale formed on the entire surface of the polishing scratches removed, so it is matte and has a soft appearance without having a strong metallic color like conventional polished surfaces. have. Next, the present invention will be specifically explained using examples. Table 1 shows SUS430 cold rolled coil (0.7×850×
It shows the surface roughness at each step when No. 4 polishing was performed on C) by the method of the present invention and the conventional method.

【table】

[Table] Note that the conditions in each step were the same for both the method of the present invention and the conventional method shown in Table 1, and the following conditions were used. (1) Measurement of surface roughness: Performed according to JIS-B-0601, and measured the maximum height Rmax. (2) Annealing conditions: material temperature 800℃, heat treatment for 2.5 minutes. (3) Pickling conditions: Salt bath pretreatment followed by nitric acid electrolytic pickling treatment. (4) Temper rolling conditions: Rolled with an elongation rate of 5% using a 2H mill with rolling rolls of 760 mmφ. (5) Polishing conditions: Polishing with a #320 cross belt while spraying mineral polishing oil with a viscosity of 10cst (40℃). It can be seen from Table 1 that the polished surface of the stainless steel plate obtained by the method of the present invention is finer and more uniform than that of the conventional method. As described above, according to the present invention, it is possible to produce a stainless steel plate having a fine and uniformly polished surface that could not be obtained by conventional methods. In addition, since the present invention can use a conventional cross belt as the abrasive belt, the manufacturing efficiency is good, the belt life is long, and the number of steps is the same as the conventional method, so the manufacturing cost is lower than when using a paper belt. Therefore, it becomes lower. Furthermore, since the present invention does not contain any unstable elements in terms of process, products of constant quality can be manufactured at all times.

Claims (1)

[Claims] 1. In manufacturing a polished stainless steel plate,
A method for producing a polished stainless steel sheet, which comprises performing surface polishing after cold rolling, followed by annealing and pickling. 2. The method for manufacturing a polished stainless steel sheet according to claim 1, wherein the surface polishing is performed using a cross belt.