JPH0827544A - Thin steel sheet for floppy disk shutter excellent in fingerprinting resistance - Google Patents
Thin steel sheet for floppy disk shutter excellent in fingerprinting resistanceInfo
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- JPH0827544A JPH0827544A JP16223494A JP16223494A JPH0827544A JP H0827544 A JPH0827544 A JP H0827544A JP 16223494 A JP16223494 A JP 16223494A JP 16223494 A JP16223494 A JP 16223494A JP H0827544 A JPH0827544 A JP H0827544A
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- thin steel
- steel sheet
- floppy disk
- disk shutter
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、フロッピーディスク
シャッターに用いられる薄鋼板に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin steel plate used for a floppy disk shutter.
【０００２】[0002]
【従来の技術】従来フロッピーディスクシャッター材と
しては、ＳＵＳ３０４・ＨＬ（ヘアライン、ＪＩＳ Ｇ
４３０５による表面仕上の記号）材が使用されてい
る。ＳＵＳ３０４・ＨＬは、鏡面仕上げのＳＵＳ３０４
に比較して、汚れがつきにくく、少々のきずがついても
目立たないという利点があるためである。2. Description of the Related Art Conventional floppy disk shutter materials include SUS304 / HL (hairline, JIS G
4305 surface finish symbol) material is used. SUS304 ・ HL is a mirror-finished SUS304.
This is because it has the advantages of being less likely to get dirty and being inconspicuous even if a few scratches are present, as compared with.
【０００３】しかしながら、ＳＵＳ３０４・ＨＬは、ヘ
アライン模様を形成するため、ステンレスシートをレベ
リングにより反りを矯正してから表面脱脂処理を施し、
一方でコイルを繰り出しでコイルを巻き取る間に、糸入
りバフで研磨するか、研磨材入りの当て材をあてて、シ
ートの進行方向に微細なスリキズを付与して製造されて
いる。この場合、加工に先立って、シート面の平坦度、
清浄度を高くしておかねばならず、またかなりの熟練を
要するため、コストアップの要因となり、価格が高いも
のになってしまうという問題点を有していた。However, in order to form a hairline pattern, SUS304 / HL is subjected to surface degreasing after straightening the warp of the stainless sheet by leveling,
On the other hand, it is manufactured by polishing with a buff containing a thread or applying a pad material containing an abrasive to give fine scratches in the traveling direction of the sheet while the coil is being unrolled and wound up. In this case, prior to processing, the flatness of the sheet surface,
Since the degree of cleanliness must be high and a considerable amount of skill is required, it causes a cost increase, resulting in a high price.
【０００４】さらに、指紋がつくと目立ちやすいという
問題を抱えていた。フロッピーデイスクは可搬性が特徴
であるため、人間の手に触れる機会が多く、そうした際
に指紋が付くと美観を損ね、また場合によっては嫌悪感
をもたらしたりする。Further, there is a problem in that fingerprints tend to stand out. Since floppy disks are characterized by their portability, they often come into contact with human hands, and fingerprints on them make them unattractive and, in some cases, cause disgust.
【０００５】このような問題に対処するため、特開平３
−７７７０６号公報にみられるように、表面にヘアライ
ン状の模様をつけた圧延ロールを用いてシートを圧延す
ることにより、ヘアライン状模様を薄板に転写させる方
法が行われるようになってきている。In order to deal with such a problem, Japanese Patent Laid-Open No. Hei 3
As disclosed in Japanese Patent Publication No. 77706, a method of transferring a hairline pattern to a thin plate by rolling the sheet using a rolling roll having a hairline pattern on its surface has come to be used.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、前述し
たヘアライン状模様を薄板に転写する方法では、フロッ
ピーディスクシャッター材の製造コストは低減するが、
依然として指紋がつくと目立ちやすいという問題点があ
る。However, in the method of transferring the hairline pattern to the thin plate described above, the manufacturing cost of the floppy disk shutter material is reduced,
However, there is still a problem in that fingerprints tend to stand out.
【０００７】一方、どのように金属表面を制御すれば指
紋がつきにくくなるか、またどうすれば美麗な金属光沢
面が得られるかという点について、具体的な知見はこれ
までのところ皆無である。On the other hand, no specific knowledge has been obtained so far on how to control the metal surface to prevent fingerprints from forming and how to obtain a beautiful metallic glossy surface.
【０００８】この発明は、従来技術の上述のような問題
点を解消するためになされたものであり、製造コストが
安価で指紋が目立ちにくい耐指紋性に優れたフロッピー
ディスクシャッター用薄鋼板を提供することを目的とし
ている。The present invention has been made in order to solve the above-mentioned problems of the prior art, and provides a thin steel plate for a floppy disk shutter which is inexpensive to manufacture and has excellent fingerprint resistance in which fingerprints are inconspicuous. The purpose is to do.
【０００９】[0009]
【課題を解決するための手段】この発明に係る耐指紋性
に優れたフロッピーディスクシャッター用薄鋼板は、圧
延方向と直角方向の中心線平均粗さ（Ｒａ）が０．２〜
２．０μｍ、粗さ曲線の中心線に対する片寄り指数であ
るスキューネス（Ｒｓｋ）が−０．８〜＋１．５、粗さ
曲線の平均山間隔（Ｒｓｍ）が５０〜３００μｍであ
り、ＪＩＳ Ｚ８７４１に定める入射角および受光角が
２０°のときの鏡面光沢度が３０〜２００％、白色度が
２５〜５０％の表面状態を有するものである。The thin steel sheet for a floppy disk shutter excellent in fingerprint resistance according to the present invention has a center line average roughness (Ra) in the direction perpendicular to the rolling direction of 0.2 to 0.2.
2.0 μm, skewness (Rsk), which is a deviation index with respect to the center line of the roughness curve, is −0.8 to +1.5, and average mountain interval (Rsm) of the roughness curve is 50 to 300 μm. It has a surface state in which the specular glossiness is 30 to 200% and the whiteness is 25 to 50% when the defined incident angle and light receiving angle are 20 °.
【００１０】また、材料中のマルテンサイト量が１０ｖ
ｏｌ％以下であり、残部実質的にオーステナイト相から
なるものである。Further, the amount of martensite in the material is 10v.
It is ol% or less, and the balance substantially consists of an austenite phase.
【００１１】[0011]
【作用】本発明の薄鋼板の限定理由について説明する。The reason for limiting the thin steel sheet of the present invention will be described.
【００１２】（１）中心線平均粗さ（Ｒａ） ０．２μｍよりも小さいと光沢度が上がるため、ついた
指紋が目立ちやすく、耐指紋性が劣る。また、２．０μ
ｍよりも大きいと白色度が上がりすぎ、フロッピーディ
スクシャッター材としての意匠性を損ねる。そのため、
Ｒａは０．２〜２．０μｍとした。(1) Center line average roughness (Ra) If it is less than 0.2 μm, the glossiness is increased, so that the attached fingerprints are conspicuous and the fingerprint resistance is poor. Also, 2.0μ
If it is larger than m, the whiteness will be too high and the designability as a floppy disk shutter material will be impaired. for that reason,
Ra was 0.2 to 2.0 μm.
【００１３】（２）粗さ曲線の中心線に対する片寄り指
数であるスキューネス（Ｒｓｋ） −０．８がよりも小さいと圧延目の山が平たい形状とな
り、指紋が不可避的に付着した際でも指紋の転写面積が
大きくなり、結果的に指紋が目立ちやすくなる。また、
＋１．５よりも大きいと、谷が平たい形状となり、指紋
が谷の底に付着しやすくなる。圧延目の山のすそ野が広
くなりすぎて、かえって指紋が目立ちやすくなる。その
ため、Ｒｓｋは−０．８〜＋１．５とした。(2) If the skewness (Rsk) −0.8, which is an offset index with respect to the center line of the roughness curve, is smaller than that, the peaks of the rolled rolls become flat, and even if fingerprints are unavoidably attached, the fingerprints will be formed. As a result, the transfer area becomes larger, and as a result, the fingerprints are more visible. Also,
When it is larger than +1.5, the valley has a flat shape, and fingerprints are easily attached to the bottom of the valley. The ridges of the rolled eyes become too wide, making the fingerprints more noticeable. Therefore, Rsk is set to -0.8 to +1.5.
【００１４】（３）粗さ曲線の平均山間隔（Ｒｓｍ） ５０μｍよりも小さいと指紋が不可避的に付着した際で
も、その付着部分がより連続的に細かいピッチで存在
し、指紋が目立ちやすい。３００μｍを超えると圧延目
の間隔が拡がりすぎ、材料の谷部での指紋転写が発生
し、指紋が目立ちやすい。したがって、Ｒｓｍは５０〜
３００μｍとした。(3) If the average peak interval (Rsm) of the roughness curve is smaller than 50 μm, even when fingerprints are inevitably adhered, the adhered portions are present continuously at a fine pitch, and the fingerprints are apt to stand out. If it exceeds 300 μm, the distance between the rolled meshes becomes too wide, and fingerprint transfer occurs at the valleys of the material, making the fingerprints noticeable. Therefore, Rsm is 50-
It was set to 300 μm.
【００１５】（４）光沢度 ３０％未満であると金属光沢に乏しくなり、フロッピー
ディスク用シャッター材としての商品の意匠性が損なわ
れ、一方、２００％を超えると指紋が目立ちやすい。し
たがって、光沢度は３０〜２００％とした。(4) Gloss If the gloss is less than 30%, the metallic luster becomes poor, and the design of the product as a shutter material for a floppy disk is impaired. On the other hand, if it exceeds 200%, fingerprints tend to stand out. Therefore, the glossiness is set to 30 to 200%.
【００１６】（５）白色度 ２５％未満であると指紋が目立ちやすく、５０％を超え
ると金属光沢に乏しくなり、フロッピーディスク用シャ
ッター材としての商品の意匠性が損なわれる。したがっ
て、白色度は２５〜５０％とした。(5) When the whiteness is less than 25%, fingerprints are conspicuous, and when it exceeds 50%, the metallic luster becomes poor and the design of the product as a shutter material for a floppy disk is impaired. Therefore, the whiteness is set to 25 to 50%.
【００１７】なお、上述した表面性状は、薄板材を仕上
冷間圧延するときに、ロールの表面を適当な目の砥石で
研磨した圧延ロールで圧延することにより得られるが、
レーザーや放電加工、その他の加工方法によっても得ら
れる。The above-mentioned surface texture can be obtained by rolling the surface of the roll with a rolling roll whose surface is polished with a grindstone of an appropriate size when the thin plate material is finish cold-rolled.
It can also be obtained by laser, electric discharge machining, or other machining methods.
【００１８】次に、好ましい材料について述べる。 （１）組織 フロッピーディスク用シャッター材に求められる性能と
して、出来るだけ非磁性であることが求められる。した
がって、上記表面性状に加えて金属組織を調整すること
が望ましく、具体的には、マルテンサイト量を１０ｖｏ
ｌ. ％以下にするのが好ましい。これはマルテンサイト
が強磁性であるため、１０ｖｏｌ. ％を超えるとフロッ
ピーディスクの帯磁による誤動作やプレス加工時のカス
上がりの原因となるからである。残部は非磁性であれば
よいが、オーステナイト相であることが加工性の点で有
利である。また、非金属介在物、金属間化合物を含んで
もよい。ただし、δフェライト相を含む場合には、マル
テンサイト相との総和が１０ｖｏｌ. ％以下に抑えるこ
とが好ましい。Next, preferable materials will be described. (1) Structure As a performance required for a shutter material for a floppy disk, it is required to be as non-magnetic as possible. Therefore, it is desirable to adjust the metallographic structure in addition to the above surface properties. Specifically, the amount of martensite is 10 vo
It is preferably less than 1%. This is because martensite is ferromagnetic, and if it exceeds 10 vol.%, It may cause a malfunction due to magnetization of the floppy disk or cause scraps during press working. The balance may be non-magnetic, but the austenite phase is advantageous in terms of workability. In addition, non-metallic inclusions and intermetallic compounds may be included. However, in the case where the δ ferrite phase is included, it is preferable to suppress the total sum with the martensite phase to 10 vol.% Or less.
【００１９】（２）成分 本発明において成分は特に規定しない。上記表面状況お
よび組織条件を満たせば任意の材料でよい。ただし、実
用的観点からすれば、上記金属組織を容易に形成出来る
のはステンレス鋼であり、またフロッピーシャッター用
としてある程度の耐食性が求められる点からもステンレ
ス鋼が望ましい。(2) Component In the present invention, the component is not particularly specified. Any material may be used as long as it satisfies the above surface condition and texture condition. However, from a practical point of view, it is stainless steel that can easily form the above metal structure, and stainless steel is desirable from the viewpoint that corrosion resistance to some extent is required for a floppy shutter.
【００２０】さらに好ましくは上述した組織が得られ易
い安定オーステナイト系または準安定オーステナイト系
ステンレス鋼であり、下記成分のものが望ましい。More preferably, it is a stable austenitic or metastable austenitic stainless steel from which the above-mentioned structure is easily obtained, and the following components are desirable.
【００２１】Ｃはオーステナイト生成元素であり、δ−
フェライトや加工誘起マルテンサイトの生成を抑制する
ためには、０．０１ｗｔ．％以上添加することが望まし
い。しかし、Ｃは加工誘起マルテンサイトを強化させる
元素であり、過度に添加すると材料の硬化が著しく、ま
たＣｒ炭化物が多量に析出されやすくなり、耐食性も劣
化するので０．２ｗｔ. ％を上限とするのが好ましい。C is an austenite forming element, and δ-
To suppress the formation of ferrite and processing-induced martensite, 0.01 wt. % Or more is desirable. However, C is an element that strengthens the work-induced martensite, and if it is added excessively, the material will be significantly hardened, and a large amount of Cr carbides will be easily precipitated, and the corrosion resistance will also deteriorate, so 0.2 wt.% Is the upper limit. Is preferred.
【００２２】Ｓｉは脱酸のために０．１ｗｔ. ％以上必
要であるが、過剰に添加するとδ−フェライトが析出し
て、熱間加工性が劣化するので２ｗｔ. ％を上限とする
のが好ましい。Si is required to be 0.1 wt.% Or more for deoxidation, but if added excessively, .delta.-ferrite precipitates and the hot workability deteriorates. Therefore, the upper limit is 2 wt.%. preferable.
【００２３】Ｍｎはオーステナイト生成元素であり、溶
体化処理によりオーステナイト単相とするため、また脱
酸のために０．１ｗｔ. ％以上添加することが望まれ
る。しかし、１０ｗｔ. ％を超えても顕著な効果はない
ため、上限は１０ｗｔ. ％とすることが好ましい。Mn is an austenite-forming element and is preferably added in an amount of 0.1 wt.% Or more in order to form an austenite single phase by solution treatment and for deoxidation. However, even if it exceeds 10 wt.%, There is no remarkable effect, so the upper limit is preferably set to 10 wt.%.
【００２４】Ｎｉは強力なオーステナイト生成元素であ
り、４ｗｔ. ％未満では焼鈍後にオーステナイト単相と
ならず、１１ｗｔ. ％を超えるとオーステナイト安定化
の効果は飽和し、また高価でもあるので、その範囲を４
〜１１ｗｔ．％とすることが好ましい。Ni is a strong austenite-forming element. If it is less than 4 wt.%, It does not become an austenite single phase after annealing, and if it exceeds 11 wt.%, The effect of stabilizing austenite is saturated and it is expensive. 4
~ 11 wt. % Is preferable.
【００２５】Ｃｒはステンレス鋼としての耐食性の点か
ら１３ｗｔ. ％以上の添加が好ましく、２０ｗｔ. ％を
超えるとフェライト量が増加し、熱間加工性が劣化する
傾向にある。そのため、その範囲を１３〜２０ｗｔ. ％
とすることが好ましい。From the viewpoint of corrosion resistance as stainless steel, Cr is preferably added in an amount of 13 wt.% Or more. If it exceeds 20 wt.%, The amount of ferrite increases and the hot workability tends to deteriorate. Therefore, the range is 13 to 20 wt.%
It is preferable that
【００２６】Ｃｕは不働態皮膜の構造を強化し、耐食性
を付与する元素である。本鋼の成分や材質の下では０．
０８ｗｔ. ％以上で耐蝕性を向上させるが、０．９ｗ
ｔ. ％を超えて添加してもその効果は飽和する。そのた
め、その範囲を０．０８〜０．９ｗｔ. ％とすることが
好ましい。Cu is an element that strengthens the structure of the passive film and imparts corrosion resistance. Depending on the composition and material of this steel,
Corrosion resistance is improved by more than 08wt.%, But 0.9w
Even if added in excess of t.%, the effect is saturated. Therefore, the range is preferably 0.08 to 0.9 wt.%.
【００２７】Ｎはオーステナイト生成元素であるため、
０．０１ｗｔ. ％以上の添加が好ましいが、多量の添加
は鋳造時にブローホールの原因となるため、０．８ｗ
ｔ. ％以下とすることが好ましい。なお、仕上冷延前の
溶体化処理で窒化物が生成しない範囲で、吸窒は許容で
きる。Since N is an austenite forming element,
Addition of 0.01 wt.% Or more is preferable, but addition of a large amount causes blow holes during casting, so 0.8 w
It is preferably t.% or less. Nitrogen absorption is permissible as long as no nitride is formed in the solution treatment before finish cold rolling.
【００２８】Ｓは線状非金属介在物の量や大きさを増大
させるとともに、材料自体の延靱性をも低下させ、材料
の打ち抜き加工性を向上させる元素である。このような
効果を得るためには、０．００１ｗｔ. ％以上の添加が
好ましいが、過度に添加すると耐食性や曲げ加工性が劣
化するため、０．０２ｗｔ. ％を上限とすることが好ま
しい。S is an element that increases the amount and size of linear non-metallic inclusions, reduces the ductility and toughness of the material itself, and improves the punching workability of the material. To obtain such an effect, addition of 0.001 wt.% Or more is preferable, but excessive addition deteriorates corrosion resistance and bending workability, so 0.02 wt.% Is preferable as the upper limit.
【００２９】ｓｏｌ．Ａｌは非金属介在物の数および組
成を決める重要な元素であり、０．０１ｗｔ. ％を超え
ると鋼中の酸素は０．００２ｗｔ. ％未満となり、介在
物数は低下するものの、介在物組成がＡｌ2 Ｏ3 系のも
のとなり表面欠陥が発生し、この欠陥が破断の起点とな
りやすい。０．０００１ｗｔ. ％未満のｓｏｌ．Ａｌと
すると、溶鋼中の酸素量は０．０１ｗｔ. ％を超え介在
物数が増大するとともに、介在物組成が高融点のＭｎＯ
−ＳｉＯ2 の２元系やＣｒ2 Ｏ3 となり、熱間での延伸
性が低下してしまい、このような介在物も破断の起点と
なりやすい。したがって、ｓｏｌ．Ａｌは０．０００１
〜０．０１ｗｔ. ％、Ｏは０．００２〜０．０１ｗｔ.
％とすることが好ましい。Sol. Al is an important element that determines the number and composition of non-metallic inclusions. If it exceeds 0.01 wt.%, Oxygen in the steel will be less than 0.002 wt.%, And the number of inclusions will decrease, but the composition of inclusions will be Al. It becomes a 2 O 3 system and surface defects occur, and these defects tend to be the starting points of fracture. Less than 0.0001 wt.% Sol. When Al is used, the amount of oxygen in the molten steel exceeds 0.01 wt.%, The number of inclusions increases, and the composition of inclusions is MnO having a high melting point.
It becomes a binary system of —SiO 2 or Cr 2 O 3 and the drawability during hot is deteriorated, and such inclusions also tend to be the starting point of fracture. Therefore, sol. Al is 0.0001
~ 0.01 wt.%, O is 0.002-0.01 wt.
% Is preferable.
【００３０】さらに、マルテンサイトの生成を抑制する
ためには、数１で定義されるＭｄ30（℃）が−２０℃以
下であることが好ましい。Further, in order to suppress the formation of martensite, it is preferable that Md30 (° C) defined by the equation 1 is -20 ° C or less.
【００３１】[0031]
【数１】 [Equation 1]
【００３２】しかし、あまりにＭｄ30値を下げても、冷
間仕上圧延後のマルテンサイト量を低減させる効果は飽
和するとともに、オーステナイト安定化元素であるＮ
ｉ、Ｍｎ、Ｎを多く添加せざるをえなくなり、コスト高
になるので下限を−２００℃とするのが望ましい。However, if the Md30 value is lowered too much, the effect of reducing the amount of martensite after cold finish rolling is saturated, and N, which is an austenite stabilizing element, is saturated.
Since it is unavoidable to add a large amount of i, Mn, and N and the cost increases, it is desirable to set the lower limit to -200 ° C.
【００３３】[0033]
【実施例】本発明の実施例を以下に説明する。表１に示
す成分組成の鋼を溶製してスラブを得、このスラブの表
面を手入れした後加熱炉で加熱して、熱間圧延を行っ
た。EXAMPLES Examples of the present invention will be described below. Steel having the composition of components shown in Table 1 was melted to obtain a slab, and the surface of the slab was cared for and then heated in a heating furnace to carry out hot rolling.
【００３４】[0034]
【表１】 [Table 1]
【００３５】そして、熱間圧延により得られた厚さ３ｍ
ｍの中間素材を中間焼鈍、中間冷延した後、１０５０℃
のＨ2 ８５％−Ｎ2 １５％の雰囲気内で光輝焼鈍を行
い、さらに仕上冷間圧延を行って０．１５ｍｍ厚さの薄
鋼板を得た。この薄鋼板の仕上冷間圧延に際しては、圧
延ロールの表面を種々の粗さ条件に加工して圧延したの
で、本発明鋼の表面性状に適合するもの（材料符号Ａ〜
Ｃ）と、本発明鋼の表面性状に適合しない比較材（材料
符号Ｄ〜Ｉ）の９種類の冷延板を得ることができた。な
お、Ｈ鋼のみは、最終の処理を焼鈍＋酸洗で行なって表
面の状態を形成させた。The thickness of 3 m obtained by hot rolling
1050 ° C after intermediate annealing and intermediate cold rolling of the intermediate material of m
Bright annealing was performed in an atmosphere of H 2 85% -N 2 15%, and finish cold rolling was performed to obtain a thin steel sheet having a thickness of 0.15 mm. In the finish cold rolling of this thin steel sheet, the surface of the rolling roll was processed under various roughness conditions and rolled, so that the surface properties of the steel of the present invention (material code A to
It was possible to obtain 9 types of cold-rolled sheets of C) and comparative materials (material codes D to I) that do not conform to the surface properties of the steel of the present invention. For H steel alone, the final treatment was performed by annealing and pickling to form the surface condition.
【００３６】これら９種類の薄鋼板の表面の圧延と直角
方向の粗さ測定をおこなうとともに、圧延と直角方向の
光沢度および白色度を測定した。さらには、薄鋼板表面
に親指を押し付け、押し付ける前と押し付けた後の光沢
度を測定し、光沢度の変化から指紋の見にくさを評価し
た。そして、（指紋をつけた後の光沢度）／（指紋をつ
ける前の光沢度）の値が５０以下を不可（×、指紋が目
立つ）とした。これらの調査結果を表２に示す。The surface of each of these 9 types of thin steel sheets was rolled and the roughness was measured in the direction perpendicular to the surface, and the gloss and whiteness in the direction perpendicular to the rolling were measured. Furthermore, the thumb was pressed against the surface of the thin steel sheet, the glossiness before and after the pressing was measured, and the visibility of fingerprints was evaluated from the change in glossiness. Then, the value of (glossiness after fingerprinting) / (glossiness before fingerprinting) was 50 or less was set as unacceptable (x, fingerprint is conspicuous). The results of these investigations are shown in Table 2.
【００３７】[0037]
【表２】 [Table 2]
【００３８】表２から明らかなように、発明材Ａ〜Ｃ
は、表面粗さ、光沢度および白色度とも本発明で規定す
る範囲に入っており、指紋が見にくく美麗な表面を有す
ることが分かる。As is apparent from Table 2, invention materials A to C
The surface roughness, the glossiness, and the whiteness are within the ranges defined in the present invention, and it can be seen that fingerprints are hard to see and the surface has a beautiful appearance.
【００３９】これに反して、比較材ＤはＲｓｋやＲｓｍ
は本発明で規定する範囲に入っているが、Ｒａが高いた
め表面が白く見える。比較材ＥはＲａとＲｓｍが低く、
かつ白色度が低いため、指紋が目立ちやすい。比較材Ｆ
はＲｓｋが高いため、また比較鋼ＧはＲｓｍが大きすぎ
るため、指紋が目立ちやすい。比較材Ｈは酸洗のときの
粒界侵食の影響が残っているため、光沢度が低く、白色
度が高い。比較材Ｉはヘアライン材であり、Ｒａが小さ
く光沢度が高いため、指紋が非常に目立ちやすい。On the contrary, the comparative material D is Rsk or Rsm.
Is within the range specified in the present invention, but the surface looks white due to high Ra. Comparative material E has low Ra and Rsm,
Moreover, since the whiteness is low, fingerprints are easily noticeable. Comparative material F
Has a high Rsk, and Comparative Steel G has a too large Rsm, and thus fingerprints are easily noticeable. The comparative material H has a low glossiness and a high whiteness because the effect of grain boundary erosion during pickling remains. Since the comparative material I is a hairline material and has a small Ra and a high glossiness, fingerprints are very noticeable.
【００４０】[0040]
【発明の効果】この発明により、指紋が目立たず、表面
が美麗な薄鋼板を安価に得ることができる。EFFECTS OF THE INVENTION According to the present invention, it is possible to obtain a thin steel plate, which has a beautiful surface without fingerprints being conspicuous at low cost.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小林 聡雄 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 若狭 浩 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 山本 彰 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Kobayashi 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Hiroshi Wakasa 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd. (72) Inventor Akira Yamamoto 1-2 1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd.
Claims (2)
（Ｒａ）が０．２〜２．０μｍ、粗さ曲線の中心線に対
する片寄り指数であるスキューネス（Ｒｓｋ）が−０．
８〜＋１．５、粗さ曲線の平均山間隔（Ｒｓｍ）が５０
〜３００μｍであり、ＪＩＳ Ｚ ８７４１に定める入
射角および受光角が２０°のときの鏡面光沢度が３０〜
２００％、白色度が２５〜５０％である表面を有するこ
とを特徴とする耐指紋性に優れたフロッピーディスクシ
ャッター用薄鋼板。1. A center line average roughness (Ra) in the direction perpendicular to the rolling direction is 0.2 to 2.0 μm, and a skewness (Rsk), which is a deviation index with respect to the center line of the roughness curve, is −0.
8 to +1.5, the average mountain interval (Rsm) of the roughness curve is 50
˜300 μm, and the specular glossiness is 30˜ when the incident angle and the light receiving angle defined by JIS Z 8741 are 20 °.
A thin steel sheet for a floppy disk shutter having excellent fingerprint resistance, which has a surface of 200% and a whiteness of 25 to 50%.
ト量１０ｖｏｌ％以下、残部実質的にオーステナイト相
からなる請求項１記載の耐指紋性に優れたフロッピーデ
ィスクシャッター用薄鋼板。2. The thin steel sheet for a floppy disk shutter excellent in fingerprint resistance according to claim 1, wherein the metal structure of the thin steel sheet comprises a martensite amount of 10 vol% or less and the balance substantially consists of an austenite phase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16223494A JPH0827544A (en) | 1994-07-14 | 1994-07-14 | Thin steel sheet for floppy disk shutter excellent in fingerprinting resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16223494A JPH0827544A (en) | 1994-07-14 | 1994-07-14 | Thin steel sheet for floppy disk shutter excellent in fingerprinting resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0827544A true JPH0827544A (en) | 1996-01-30 |
Family
ID=15750526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16223494A Withdrawn JPH0827544A (en) | 1994-07-14 | 1994-07-14 | Thin steel sheet for floppy disk shutter excellent in fingerprinting resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0827544A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013061689A1 (en) * | 2011-10-24 | 2013-05-02 | 日本写真印刷株式会社 | Hairline-like decorative molded article providing sensation unique to hairline processing and providing fingerprint resistance |
| US20220010392A1 (en) * | 2018-11-12 | 2022-01-13 | Posco | Nonmagnetic austenitic stainless steel and manufacturing method therefor |
-
1994
- 1994-07-14 JP JP16223494A patent/JPH0827544A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013061689A1 (en) * | 2011-10-24 | 2013-05-02 | 日本写真印刷株式会社 | Hairline-like decorative molded article providing sensation unique to hairline processing and providing fingerprint resistance |
| US20220010392A1 (en) * | 2018-11-12 | 2022-01-13 | Posco | Nonmagnetic austenitic stainless steel and manufacturing method therefor |
| JP2022507339A (en) * | 2018-11-12 | 2022-01-18 | ポスコ | Non-magnetic austenitic stainless steel and its manufacturing method |
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