JPH03169405A - Manufacture of mirror finished stainless steel sheet for road reflector - Google Patents
Manufacture of mirror finished stainless steel sheet for road reflectorInfo
- Publication number
- JPH03169405A JPH03169405A JP30894489A JP30894489A JPH03169405A JP H03169405 A JPH03169405 A JP H03169405A JP 30894489 A JP30894489 A JP 30894489A JP 30894489 A JP30894489 A JP 30894489A JP H03169405 A JPH03169405 A JP H03169405A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- mirror
- polishing
- steel sheet
- surface roughness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 17
- 239000010935 stainless steel Substances 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 238000005498 polishing Methods 0.000 claims abstract description 24
- 238000000137 annealing Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 8
- 230000003746 surface roughness Effects 0.000 abstract description 21
- 229910000831 Steel Inorganic materials 0.000 abstract description 7
- 239000013078 crystal Substances 0.000 abstract description 7
- 239000010959 steel Substances 0.000 abstract description 7
- 239000002245 particle Substances 0.000 abstract description 4
- 238000004904 shortening Methods 0.000 abstract 1
- 238000005097 cold rolling Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 8
- 238000005096 rolling process Methods 0.000 description 4
- 239000003082 abrasive agent Substances 0.000 description 3
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 3
- 239000010960 cold rolled steel Substances 0.000 description 3
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 2
- 239000006061 abrasive grain Substances 0.000 description 2
- 229910000423 chromium oxide Inorganic materials 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 235000011470 Adenanthera pavonina Nutrition 0.000 description 1
- 240000001606 Adenanthera pavonina Species 0.000 description 1
- 101150000971 SUS3 gene Proteins 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- NMEHNETUFHBYEG-IHKSMFQHSA-N tttn Chemical compound C([C@@H](C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CC=1C=CC(O)=CC=1)C(=O)N[C@@H](CO)C(=O)N[C@@H](CC=1NC=NC=1)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H](C)C(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H](C(C)C)C(=O)NCC(=O)N[C@@H](CC(O)=O)C(=O)N[C@@H](C(C)C)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H](CC(O)=O)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N1[C@@H](CCC1)C(=O)NCC(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CC(O)=O)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CCCCN)C(O)=O)NC(=O)[C@H](CC(C)C)NC(=O)[C@H](CCSC)NC(=O)[C@H](CCC(O)=O)NC(=O)[C@H](CCC(O)=O)NC(=O)[C@H](CC(O)=O)NC(=O)[C@@H](NC(=O)[C@H]1N(CCC1)C(=O)[C@H](CCC(N)=O)NC(=O)[C@@H](N)[C@@H](C)O)[C@@H](C)O)C1=CC=CC=C1 NMEHNETUFHBYEG-IHKSMFQHSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
Description
【発明の詳細な説明】
く産業上の利用分野〉
本発明は、ラッピング仕上げした表面光沢、写像性の優
れたカーブξラー川鏡面仕上げステンレス鋼仮の製造方
法に関する。DETAILED DESCRIPTION OF THE INVENTION Industrial Field of Application The present invention relates to a method for producing a curved ξ mirror finish stainless steel tentatively finished by lapping and having excellent surface gloss and image clarity.
〈従来の技術〉
鏡面仕上げステンレス鋼は、建材（内外装材）、道路の
カーブミラー、プラスヂンク、写真ポスター等の艶出し
耐圧板などの分野に多く使用されている．
要求される表面品質は、表面の凹凸が少なく、良好な光
沢と写像の鮮鋭度を有することである．これらを満足さ
せるためには、表面性状の優れた冷間圧延ステンレス鋼
板を必要とする．一般的に冷間圧延ステンレス鋼板は、
熱間圧延鋼４ｊＦを焼鈍し、脱スケール後冷間圧延し、
焼鈍後調質圧延し、形状矯正で仕上げられる．冷間圧延
工程では中間に焼鈍を入れて、複数回行うこともある．
冷間圧延後の焼鈍を燃焼雰囲気で行う場合には脱スケー
ルを行うが、脱スケールの際表面の結晶粒界が侵食を受
け、表面の凹凸を大きくする欠点がある。光輝焼鈍の場
合には脱スケールを必要としないため、表面の凹凸を大
きくしないので、鏡面仕上げステンレス１１仮は殆ど光
輝焼鈍材が使用されていた．
従来の表面粗さを小さくする技術は平坦な板をそのまま
鏡面研摩仕上げすることを前提にしたものである。<Conventional Technology> Mirror-finished stainless steel is widely used in fields such as building materials (interior and exterior materials), curved mirrors for roads, plastic sinks, and polished pressure plates for photo posters, etc. The required surface quality is that the surface has few irregularities, good gloss, and sharpness of mapping. In order to satisfy these requirements, cold-rolled stainless steel sheets with excellent surface properties are required. Generally, cold rolled stainless steel sheets are
Hot rolled steel 4jF is annealed, descaled and then cold rolled,
After annealing, it is temper rolled and finished by shape correction. The cold rolling process may be repeated multiple times with an intermediate annealing step.
When annealing after cold rolling is performed in a combustion atmosphere, descaling is performed, but there is a drawback that grain boundaries on the surface are eroded during descaling, making the surface rougher. In the case of bright annealing, descaling is not required and the surface unevenness is not increased, so bright annealing was used for most of the mirror finish stainless steel 11 temporary. Conventional techniques for reducing surface roughness are based on the premise that flat plates are mirror-polished as they are.
従来、鏡面研摩仕上げする際、従来、砥石で下地研摩を
施し、次いでラッピング仕上げを行っていた．しかし最
近は、鏡面研摩工程負荷の軽減を図る目的で、下地研摩
を省略して、ラッピングで鏡面研摩仕上げする傾向にあ
る。このため、研摩素材表面の表面粗さはＲａ Ｏ．０
５μｍ以下が一般的になっている。表面粗さを細かくす
るために、例えばオーステナイト系ステンレス鋼仮の場
合、熱間圧延鋼帯を焼鈍、脱スケール後、ベルトグライ
ンダーにより表面粗さＲａ Ｏ．１５一以下に調整する
。Conventionally, when mirror-polishing a product, the base polishing was performed using a grindstone, and then the lapping finish was performed. However, recently, in order to reduce the load of the mirror polishing process, there has been a tendency to omit the base polishing and finish the mirror polishing by lapping. Therefore, the surface roughness of the surface of the abrasive material is Ra O. 0
5 μm or less is common. In order to make the surface roughness finer, for example, in the case of temporary austenitic stainless steel, the hot rolled steel strip is annealed and descaled, and then the surface roughness is reduced to Ra O. with a belt grinder. Adjust to 15-1 or less.
冷間圧延工程では冷間圧下率、冷間圧延用ロールの表面
粗さ、調質圧延用ロールの表面粗さの組合せによる．
また、特開平１−１５４８０２号公報の如く、冷間圧延
前の平均結晶粒径を１５μｍ以下にすることによって、
冷間圧延によって発生する表面の凹凸を細かくする方法
がある．
く発明が解決しようとする課題〉
ステンレス＠板の鏡面研摩においては研摩素材の表面粗
さが、生産性および商品価値に影響する．前記のように
、従来の表面粗さを小さくする技術は、平坦な板をその
まま鏡面研摩仕上げすることを前提にしたものである。In the cold rolling process, it depends on the combination of the cold rolling reduction rate, the surface roughness of the cold rolling roll, and the surface roughness of the temper rolling roll. In addition, as in JP-A-1-154802, by reducing the average grain size before cold rolling to 15 μm or less,
There is a method to reduce the surface irregularities caused by cold rolling. Problems to be Solved by the Invention In the mirror polishing of stainless steel plates, the surface roughness of the polishing material affects productivity and commercial value. As mentioned above, conventional techniques for reducing surface roughness are based on the premise that a flat plate is mirror-polished as it is.
このため、道路のカーブミラーの場合には、塑性加工を
施した後に、鏡面ｒＩｌ′Ｉ摩仕上げすることは配慮さ
れていない。ステンレス鋼仮に塑性加工、特に伸び歪が
付与されたときには、工具に接しない自由表面は変形量
の増加に伴い表面粗さが大きくなり、元のステンレス鋼
仮の表面粗さを助長し、一層鏡面研摩仕上げを困難なも
のにする。For this reason, in the case of road curve mirrors, no consideration is given to finishing the mirror surface with rIl'I polishing after plastic working. When stainless steel is subjected to plastic working, especially when elongation strain is applied, the surface roughness of the free surface that is not in contact with the tool increases as the amount of deformation increases, promoting the original stainless steel surface roughness and making it even more mirror-like. Makes polishing difficult.
本発明は、このような問題を解決したカーブミラー用鏡
面仕上げステンレス鋼仮の製造方法を提供することを目
的とする。An object of the present invention is to provide a method for manufacturing a temporary mirror-finished stainless steel for curved mirrors that solves these problems.
く課題を解決するための手段〉
本発明は、冷間圧延したステンレス鋼板の最終ｔＡ鈍後
の平均結晶粒径を１３ｐｍ以下に調整し、形状矯正し、
塑性加工後、ラッピング仕上げによって鏡面研摩するこ
とを特徴とするカーブミラー用鏡面仕上げステンレス鋼
板の製造方法である。Means for Solving the Problems> The present invention comprises adjusting the average grain size of a cold-rolled stainless steel sheet after final tA annealing to 13 pm or less, correcting the shape,
This is a method for manufacturing a mirror-finished stainless steel plate for a curved mirror, which is characterized by mirror-polishing by lapping after plastic working.
〈作 用〉 以下、本発明の原理となった実験について説明ずる。<For production> The experiments that formed the basis of the present invention will be explained below.
オーステナイト系ステンレス鋼として代表的なＳＵＳ３
０４鋼板（板厚１．０閣）を用いて、最終焼鈍の光輝焼
鈍の温度を変えて、平均結晶粒径１１〜３１ｔｔｔｎの
４水準の焼鈍板を用意した。これをＲＦＲ’ｌｔ圧延し
、レベラーシャーした後、円板で球面状の道路用カーブ
ミラーにプレス戒形した．このときの表面粗さの変化は
、光輝焼鈍→ｉＩ！質圧延後いずれもＲａ Ｏ．０３μ
ｍであり、プレス戒形は張出性で約２％の伸び歪が俳与
されており、プレス成形後はＲａ Ｏ．０３〜０．０８
μ＋１１ テある．なお、冷間圧延前の熱間圧延材にお
いては、通常の組戒、製造条件でよいが、脱スケール後
研削ベルト（１１２０）で表面粗さＲａ Ｏ．１５ｐＩ
１以下に調整する．冷間圧延工程においては、冷間圧延
圧下率６５％以上とし、冷間圧延仕上ロールはＩ６００
研摩砥石で研摩して研摩目粗さＲａ ０．０３７！ｎ＋
にして使用し、光輝焼鈍後の調質圧延ロールはｇ ｔｏ
ｏｏ研摩砥石で研摩して、研摩目粗さＲａ Ｏ．０２４
のものを使用する．この一連の工程で、表面粗さＲａ
Ｏ．０４μｍ以下のステンレス鋼手反が得られる．
ラッピングは４台の研摩機で、自由砥粒（酸化クロム）
を各研摩機で粒径０．１０ｐｍ （粗） 、０．０７μ
ｍ、０．０ｈｍ、０．０３ｐｍ （仕上）を塗布し、研
摩時間各研｝９［！ ２．５分、合ｇｔｌＯ 分ヲ標準
１１ 間トシタ， ｒＪＩＨ 後、鏡面反射率計で反射
率を測定し、評価した．なお、反射率は、半径３０００
ｍｍに加工した鏡面の接線に対し４５゜の方向で投光し
た光の反射率を測定した。SUS3 is a typical austenitic stainless steel.
Using 04 steel plate (plate thickness 1.0 mm), four levels of annealed plates having an average grain size of 11 to 31 tttn were prepared by changing the bright annealing temperature of the final annealing. This was RFR'lt rolled, leveled, and then pressed into a spherical curved road mirror using a disk. The change in surface roughness at this time is bright annealing → iI! After quality rolling, RaO. 03μ
m, and the press molding has an elongation strain of about 2% due to extensibility, and after press forming, it has an RaO. 03-0.08
There is μ+11. Note that for the hot-rolled material before cold rolling, normal assembly and manufacturing conditions may be used, but after descaling, the surface roughness Ra O. 15pI
Adjust to 1 or less. In the cold rolling process, the cold rolling reduction ratio is 65% or more, and the cold rolling finishing roll is I600.
Polished with a grindstone and the polishing roughness Ra is 0.037! n+
The temper rolling roll after bright annealing is g to
oo Polish with a grindstone to a polishing roughness of Ra O. 024
Use the one. In this series of steps, the surface roughness Ra
O. Stainless steel fabric with a diameter of 0.04 μm or less can be obtained. Lapping is done using 4 polishing machines using free abrasive grains (chromium oxide).
With each polisher, the particle size is 0.10pm (coarse), 0.07μ
m, 0.0hm, 0.03pm (finish) and polishing time for each polishing}9[! After 2.5 minutes and a total of 11 minutes, the reflectance was measured using a specular reflectance meter and evaluated. Note that the reflectance is at a radius of 3000
The reflectance of light projected in a direction of 45° to the tangent of the mirror surface processed to mm was measured.
実験結果を第１図に示す．
第１図から、平均結晶粒径を小さくすることで、従来レ
ベルに比べ塑性加工後の表面粗さも小さくなり、研摩時
間の短縮あるいは鏡面品質の向上を図ることができるこ
とが分かる．平均結晶粒径を１３μ重以下にすることで
、研摩時間が従来レベルに比べ３０％以上短縮できる。Figure 1 shows the experimental results. From Figure 1, it can be seen that by reducing the average grain size, the surface roughness after plastic working becomes smaller compared to the conventional level, and it is possible to shorten the polishing time or improve the mirror surface quality. By reducing the average grain size to 13 microns or less, polishing time can be reduced by more than 30% compared to conventional levels.
なお、ラッピング仕上げする具体的な方法は、どれでも
よい．〈実施例〉
本実施例では、代表的なオーステナイト系ステンレス鋼
ＳＵＳ３０４の４．０＋ｎｍ厚の脱スケールされた熱間
圧延ｔｒ４ ’！ｉＦを用いた．熱間圧延鋼表面に存在
ずる欠陥を除去するため、ベルトグラインダーで研削す
るが、このとき、！１２０砥粒のベルトで表面粗さＲａ
０．１５ｐｎ以下に仕上げた．冷間圧延で１．０＋ｎ
＋ａ （圧下率７５％）の冷間圧延鋼帯にするが、仕上
圧延ロールは！６００研摩砥石で研摩した表面粗さＲａ
０．０３ｐｍを使用した。Any specific method for finishing the wrapping may be used. <Example> In this example, a 4.0+nm thick descaled hot rolled tr4'! of typical austenitic stainless steel SUS304 was used. iF was used. In order to remove defects that exist on the surface of hot rolled steel, it is ground with a belt grinder, but at this time! Surface roughness Ra with 120 abrasive belt
Finished to less than 0.15 pn. 1.0+n by cold rolling
+a (reduction ratio 75%) cold rolled steel strip, but what about the finishing roll! Surface roughness Ra polished with 600 grindstone
0.03pm was used.
光輝焼鈍は、第２図に基づき、１０８０’Ｃ、保持時間
無を選沢し、平均結晶粒径１３ｐｍを得た．調質圧延は
１１０００研摩砥石で研摩した表面粗さＲａ Ｏ．０２
μｍのロールを使用し、得られた冷間圧延鋼帯の表面粗
さはＲａ Ｏ．０３ｐｍであった。Bright annealing was performed at 1080'C with no holding time based on FIG. 2, and an average crystal grain size of 13 pm was obtained. The surface roughness of the temper rolling is polished with an 11000 grinding wheel. 02
The surface roughness of the cold-rolled steel strip obtained using a roll of RaO. It was 03pm.
この冷間圧延鋼４ｊＦをレベラーシャーで形状矯正し、
鋼｛反とした。The shape of this cold rolled steel 4jF is corrected using a leveler shear,
Steel
この鋼板を用いて、道路用カーブミラーにプレス或形し
（張出しによる伸び歪は約２％）、表面粗さは尺ａ ０
．０４７ｚｍとなった。Using this steel plate, we press or shape it into a curved mirror for roads (the elongation strain due to overhang is approximately 2%), and the surface roughness is 0.
．． It became 047zm.
ラ，２ピングは４台の研摩機で各々円筒形のラシャバフ
に自由砥粒（酸化クロム）の粒径０．ｌＯｐａ （粗）
、０．０マｐｔａ， ０．０５ｎ、０．０３−（仕上
げ）を使用し、標準時間１０分を設定し、各々２．５分
間研摩し、第１図の発明材を得た．従来材と反射率を比
較して格段の向上が認められる。従来の標準時間の３０
％短い約７分（各研摩機所要時間１００秒）で、従来材
と同レベルの反射率が得られる。また、平均結晶径を更
に小さくすれば、それ以上の研摩時間短縮及び鏡面品質
の向上が図れる．
〈発明の効果〉
以上説明したように、本発明によれば、鏡面仕上げ用ス
テンレス鋼仮の製造において、研摩素材が塑性加工を施
したものであれば、研摩素材の平均結晶粒径を１３ｐｍ
以下にすることにより、ラッピング研摩において、大幅
な作業時間が短縮でき、かつ鏡面品質の向上が図れる。La, 2 ping uses 4 polishers, each with a cylindrical Lasha buff of free abrasive grains (chromium oxide) with a grain size of 0. lOpa (coarse)
, 0.0 map pta, 0.05 n, and 0.03- (finish), a standard time of 10 minutes was set, and each polishing was performed for 2.5 minutes to obtain the invention material shown in FIG. A significant improvement in reflectance compared to conventional materials can be seen. 30 of the conventional standard time
The same level of reflectance as conventional materials can be obtained in about 7 minutes (100 seconds required for each polisher). Furthermore, if the average crystal diameter is further reduced, the polishing time can be further shortened and the mirror quality can be further improved. <Effects of the Invention> As explained above, according to the present invention, in the temporary production of stainless steel for mirror finishing, if the abrasive material is plastically worked, the average crystal grain size of the abrasive material can be reduced to 13 pm.
By doing the following, in lapping polishing, the working time can be significantly shortened and the quality of the mirror surface can be improved.
第１図は表面粗さＲａ Ｏ．０４−のＳＩＪＳ３０４Ｍ
仮を約２．０％伸び歪を付与（塑性加工）した後のラッ
ピング時間と研摩後の反射率の関係と研摩素材の平均結
晶粒径の影響を示すグラフである．第２図は冷間圧下率
６５％以上のＳＵＳ３０４鋼板の焼鈍温度（保持時間３
秒）と再結晶の平均結晶粒径の関係を示すグラフである
．Figure 1 shows surface roughness RaO. 04-SIJS304M
This is a graph showing the relationship between the lapping time and the reflectance after polishing after applying approximately 2.0% elongation strain (plastic working) to the temporary material, and the influence of the average grain size of the polishing material. Figure 2 shows the annealing temperature (holding time 3
This is a graph showing the relationship between the average grain size of recrystallization and the average crystal grain size of recrystallization.
Claims (1)
径を１３μｍ以下に調整し、形状矯正し、塑性加工後、
ラッピング仕上げによって鏡面研摩することを特徴とす
るカーブミラー用鏡面仕上げステンレス鋼板の製造方法
。After the final annealing of the cold rolled stainless steel sheet, the average grain size is adjusted to 13 μm or less, the shape is corrected, and after plastic working,
A method for manufacturing a mirror-finished stainless steel plate for a curved mirror, which is characterized by mirror-polishing by lapping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30894489A JPH03169405A (en) | 1989-11-30 | 1989-11-30 | Manufacture of mirror finished stainless steel sheet for road reflector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30894489A JPH03169405A (en) | 1989-11-30 | 1989-11-30 | Manufacture of mirror finished stainless steel sheet for road reflector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03169405A true JPH03169405A (en) | 1991-07-23 |
Family
ID=17987138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30894489A Pending JPH03169405A (en) | 1989-11-30 | 1989-11-30 | Manufacture of mirror finished stainless steel sheet for road reflector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03169405A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5686044A (en) * | 1995-03-31 | 1997-11-11 | Nippon Yakin Kogyo Co., Ltd. | Austenitic stainless steels for press forming |
| WO2020071534A1 (en) | 2018-10-04 | 2020-04-09 | 日本製鉄株式会社 | Austenitic stainless steel sheet and method for producing same |
-
1989
- 1989-11-30 JP JP30894489A patent/JPH03169405A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5686044A (en) * | 1995-03-31 | 1997-11-11 | Nippon Yakin Kogyo Co., Ltd. | Austenitic stainless steels for press forming |
| WO2020071534A1 (en) | 2018-10-04 | 2020-04-09 | 日本製鉄株式会社 | Austenitic stainless steel sheet and method for producing same |
| KR20210052502A (en) | 2018-10-04 | 2021-05-10 | 닛폰세이테츠 가부시키가이샤 | Austenitic stainless steel sheet and manufacturing method thereof |
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