JPH11335810A - Production of stainless steel sheet having antifungal property - Google Patents
Production of stainless steel sheet having antifungal propertyInfo
- Publication number
- JPH11335810A JPH11335810A JP10140738A JP14073898A JPH11335810A JP H11335810 A JPH11335810 A JP H11335810A JP 10140738 A JP10140738 A JP 10140738A JP 14073898 A JP14073898 A JP 14073898A JP H11335810 A JPH11335810 A JP H11335810A
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- JP
- Japan
- Prior art keywords
- stainless steel
- layer
- steel sheet
- antibacterial
- series
- 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.)
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- Laminated Bodies (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、抗菌性を有するス
テンレス鋼板の製造方法に関する。The present invention relates to a method for producing a stainless steel sheet having antibacterial properties.
【０００２】[0002]
【従来の技術】衛生管理が要求される厨房、医療機関等
で用いられる金属材料として、耐食性の優れたステンレ
ス鋼が多用されている。2. Description of the Related Art Stainless steel having excellent corrosion resistance is widely used as a metal material used in kitchens, medical institutions, and the like that require hygiene management.
【０００３】しかし、食器等のステンレス鋼製品を使用
しているとその表面に微生物が繁殖して、ぬめりが発生
して問題となる。そのため、近年ステンレス鋼に防菌処
理を施すことが試みられている。[0003] However, when stainless steel products such as tableware are used, microorganisms grow on the surface of the products, causing slime and causing a problem. For this reason, in recent years, attempts have been made to treat bacteria with stainless steel.
【０００４】特開平５−２２８２０２号公報には、ステ
ンレス鋼あるいはその他鉄系基材とその基材上に設けた
抗菌剤を分散した塗膜との間に樹脂被膜を設ける抗菌性
処理法が開示されている。Japanese Patent Application Laid-Open No. 5-228202 discloses an antibacterial treatment method in which a resin film is provided between a stainless steel or other iron-based substrate and a coating film on which an antibacterial agent is dispersed. Have been.
【０００５】特開平６−１０１９１号公報には、金属め
っき被膜中に抗菌剤を分散させた複合めっき被膜が開示
されている。[0005] Japanese Patent Application Laid-Open No. 6-10191 discloses a composite plating film in which an antibacterial agent is dispersed in a metal plating film.
【０００６】しかし、表面にこれらの被膜を設けた鋼板
は、製品形状に成形加工する時や使用時に割れたり、磨
耗等の損傷を受けやすく、湿潤雰囲気にさらされると基
材に腐食が発生して外観が損なわれたり、抗菌成分が溶
出して抗菌作用が低下する場合がある。[0006] However, steel sheets provided with these coatings on the surface are susceptible to damage such as cracking and abrasion when formed into a product or used, and when exposed to a humid atmosphere, the base material is corroded. In some cases, the appearance may be impaired, or the antibacterial component may be eluted to lower the antibacterial action.
【０００７】特開平８−６０３０１号、特開平８−６０
３０２号、特開平８−６０３０３号各公報にはステンレ
ス鋼に固溶限を超えるＣｕを含有させ、それを交番電解
処理することにより、ステンレス鋼表面にＣｕを析出さ
せ、抗菌性を発現させる方法が開示されている。これら
の方法は、ステンレス鋼自体に抗菌性を付与する方法で
あり、前記した鉄基材の表面を被覆する方法に比べて優
れているので一部実用化されている。JP-A-8-60301, JP-A-8-60
No. 302 and JP-A-8-60303 disclose a method of adding Cu exceeding the solid solubility limit to stainless steel and subjecting it to alternating electrolytic treatment to precipitate Cu on the surface of the stainless steel and exhibit antibacterial properties. Is disclosed. These methods are methods for imparting antibacterial properties to stainless steel itself, and are partially used in practice because they are superior to the above-described method of coating the surface of an iron base material.
【０００８】しかし、これらのステンレス鋼自体に抗菌
性を付与する方法であっても、抗菌作用のあるＣｕの添
加量が増加するほどステンレス鋼板製造時の熱間加工性
が阻害され、歩留まりが低下して安価に製造することは
難しい。However, even with these methods of imparting antibacterial properties to the stainless steel itself, as the amount of Cu having an antibacterial action increases, the hot workability during the production of stainless steel sheets is hindered, and the yield decreases. It is difficult to manufacture inexpensively.
【０００９】また、交番電解処理にてステンレス鋼表層
部に形成したＣｕ濃化層は、Ｃｕが原子の状態で溶けて
いる固溶状態である。ＣｕはＦｅ、Ｃｒより酸化されに
くいため、ステンレス鋼表面には、不働態皮膜（Ｃｒ酸
化膜）が形成され、Ｃｕイオンが表面に溶出し難い。し
たがって、抗菌性の発現には問題があると考えられる。The Cu-enriched layer formed on the stainless steel surface layer by the alternating electrolytic treatment is in a solid solution state in which Cu is dissolved in an atomic state. Since Cu is harder to oxidize than Fe and Cr, a passive film (Cr oxide film) is formed on the stainless steel surface, and Cu ions are hardly eluted on the surface. Therefore, it is considered that there is a problem in the expression of antibacterial properties.
【００１０】[0010]
【発明が解決しようとする課題】本発明の課題は、ステ
ンレス鋼の熱間加工性を劣化させることなくステンレス
鋼自体に優れた抗菌性を付与し、ステンレス鋼の熱間加
工時の歩留まりを低下させることなく安価に製造できる
ステンレス鋼板の製造方法を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide stainless steel itself with excellent antibacterial properties without deteriorating the hot workability of stainless steel, and to reduce the yield during hot working of stainless steel. It is an object of the present invention to provide a method for manufacturing a stainless steel plate which can be manufactured at low cost without causing any inconvenience.
【００１１】[0011]
【課題を解決するための手段】抗菌性を有するステンレ
ス鋼板の製造方法に係わる本発明の要旨は、以下の通り
である。The gist of the present invention relating to a method for producing a stainless steel sheet having antibacterial properties is as follows.
【００１２】「ステンレス鋼板の表面に、厚さ５〜２５
μmのＣｕ層を設け、非酸化雰囲気中で前記Ｃｕ層の融
点以上、１３００℃未満の温度範囲内に加熱して、ステ
ンレス鋼板の表面にＣｕを拡散させることを特徴とする
抗菌性を有するステンレス鋼板の製造方法」ここで、Ｃ
ｕ層とは、純ＣｕおよびＣｕ合金の層を示すものとす
る。"Stainless steel plate having a thickness of 5 to 25
a stainless steel having an antibacterial property, wherein a Cu layer having a thickness of μm is provided and heated in a non-oxidizing atmosphere within a temperature range of not less than the melting point of the Cu layer and less than 1300 ° C. to diffuse Cu on the surface of the stainless steel plate. Steel sheet manufacturing method ”where C
The u layer indicates a layer of pure Cu and a Cu alloy.
【００１３】本発明者らは、表面に樹脂やめっきによる
被覆層を備えた従来の抗菌性ステンレス鋼が有する上記
諸問題は、ステンレス鋼自体に抗菌性を付与して被覆層
を無くすることにより解消することとし、鋼自身に抗菌
性を付与したステンレス鋼の熱間加工性の劣化という問
題を解消すべく鋭意検討を重ねた結果以下の知見を得
た。[0013] The present inventors have found that the above problems of the conventional antibacterial stainless steel provided with a coating layer made of resin or plating on the surface are caused by imparting antibacterial properties to the stainless steel itself and eliminating the coating layer. In order to solve the problem of deterioration of hot workability of stainless steel having antimicrobial properties given to the steel itself, the following findings were obtained as a result of intensive studies.
【００１４】Ｃｕにより抗菌性を鋼板へ付与するに
は、Ｃｕがイオン化する鋼板の表層部のみでよく、表層
部のみにＣｕを存在させればよい。In order to impart antibacterial property to the steel sheet by using Cu, it is sufficient that Cu is ionized only in the surface layer portion of the steel sheet in which Cu is ionized, and that Cu is present only in the surface layer portion.
【００１５】したがって、ステンレス鋼の熱間加工が
終了し、抗菌性製品を冷間成形する前の時点で鋼板表面
にＣｕ富化層を設けて抗菌性を付与するることにより、
抗菌性付与による熱間加工性の劣化は防止できる。Therefore, by providing a Cu-enriched layer on the surface of the steel sheet at the point of time after the hot working of the stainless steel and before the cold-forming of the antibacterial product, the antibacterial property is imparted.
Deterioration of hot workability due to imparting antibacterial properties can be prevented.
【００１６】ステンレス鋼板表層部にＣｕ富化層を設
ける方法としては、鋼板表面にＣｕ層を設けて非酸化性
雰囲気中でＣｕ層の融点以上の温度に加熱し、鋼板表層
部にＣｕを拡散させる方法がよい。As a method of providing a Cu-enriched layer on the surface of a stainless steel sheet, a Cu layer is provided on the surface of the steel sheet and heated to a temperature higher than the melting point of the Cu layer in a non-oxidizing atmosphere to diffuse Cu into the surface layer of the steel sheet. A good way is
【００１７】Ｃｕ拡散層は、表層近傍ではＣｕ濃度が
非常に高く、抗菌性に優れている。The Cu diffusion layer has a very high Cu concentration near the surface layer and has excellent antibacterial properties.
【００１８】Ｃｕ拡散層の耐食性は、フェライト系ス
テンレス鋼とほぼ同等であり、酸化により厚い皮膜も生
成されず、意匠性についても問題ない。The corrosion resistance of the Cu diffusion layer is almost equal to that of ferritic stainless steel, a thick film is not formed by oxidation, and there is no problem in design.
【００１９】[0019]
【発明の実施の形態】以下、本発明のステンレス鋼の製
造方法で規定する条件について説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The conditions specified in the method for producing stainless steel according to the present invention will be described below.
【００２０】（１）ステンレス鋼板 ステンレス鋼板の材質は、ＪＩＳで規定されているマル
テンサイト系、フェライト系、オーステナイトフェライ
ト二相系等の一般的に使用されているステンレス鋼を用
いることができる。ただし、オーステナイト系ステンレ
ス鋼は、その表面に設けたＣｕ層が耐酸化性を劣化させ
るので好ましくない。(1) Stainless steel plate As the material of the stainless steel plate, a commonly used stainless steel such as a martensite system, a ferrite system, and an austenitic ferrite two-phase system specified by JIS can be used. However, austenitic stainless steel is not preferred because the Cu layer provided on the surface deteriorates oxidation resistance.
【００２１】ステンレス鋼板は通常の方法で製造したも
のでよく、スラブを熱間圧延して得られる熱延鋼板、お
よび熱延鋼板をさらに冷間圧延して得られる冷延鋼板の
どちらでもよい。The stainless steel sheet may be manufactured by a usual method, and may be either a hot-rolled steel sheet obtained by hot-rolling a slab or a cold-rolled steel sheet obtained by further cold-rolling a hot-rolled steel sheet.
【００２２】（２）厚さ５〜２５μｍのＣｕ層 Ｃｕは、ＪＩＳ Ｈ ３１００で規定されているＣ１０
００番台〜Ｃ６０００番台の一般的に使用されている純
ＣｕおよびＣｕ合金である。(2) Cu layer having a thickness of 5 to 25 μm Cu is C10 specified in JIS H 3100.
Commonly used pure Cu and Cu alloys of the 00s to C6000s.
【００２３】ステンレス鋼板の表面にＣｕ層を設ける手
段はとくに限定するものではなく、めっきまたは圧延接
合法にてＣｕ層を設けることができる。Ｃｕ板とステン
レス鋼板とを重ね合わせて室温にて圧延する方法が比較
的容易な方法であり、安価で大量生産に適している。The means for providing the Cu layer on the surface of the stainless steel plate is not particularly limited, and the Cu layer can be provided by plating or rolling bonding. A method of superposing a Cu plate and a stainless steel plate and rolling at room temperature is a relatively easy method, and is inexpensive and suitable for mass production.
【００２４】Ｃｕ層の厚さが、５μｍ以上の場合にはＣ
ｕ拡散層の抗菌効果が増大し、５μｍ未満では、大腸菌
に対する効果は発揮するが、黄色ブドウ球菌に対する抗
菌効果が少なくなる。When the thickness of the Cu layer is 5 μm or more, C
The antimicrobial effect of the u-diffusion layer increases, and if it is less than 5 μm, the effect on E. coli is exhibited, but the antimicrobial effect on Staphylococcus aureus decreases.
【００２５】また、Ｃｕ層の厚さが２５μｍ以上では、
熱処理後の表層残留Ｃｕが増加するため耐酸化性および
耐食性が低下する。したがって、Ｃｕ層の厚さは５〜２
５μｍとした。When the thickness of the Cu layer is 25 μm or more,
Oxidation resistance and corrosion resistance decrease due to an increase in surface layer residual Cu after the heat treatment. Therefore, the thickness of the Cu layer is 5-2.
The thickness was 5 μm.
【００２６】（３）非酸化性雰囲気 非酸化性雰囲気で加熱するのは、溶融したＣｕが酸化し
てＣｕがステンレス鋼表層に拡散しなくなるのを防止す
るためである。(3) Non-Oxidizing Atmosphere Heating in a non-oxidizing atmosphere is intended to prevent oxidization of molten Cu to prevent the diffusion of Cu into the stainless steel surface layer.
【００２７】非酸化性雰囲気とは、水素、アルゴンや窒
素ガスのような不活性ガス雰囲気または真空雰囲気であ
る。真空雰囲気の場合は、Ｃｕの酸化を防止するために
１０-3Ｔｏｒｒ以下の高真空とするのがよい。酸化性雰
囲気または１０-3Ｔｏｒｒ以上の低真空中ではステンレ
ス鋼板の表面に設けたＣｕ層が酸化してステンレス鋼板
表層部に拡散しなくなり、抗菌性を付与することができ
ないからである。The non-oxidizing atmosphere is an inert gas atmosphere such as hydrogen, argon or nitrogen gas or a vacuum atmosphere. In the case of a vacuum atmosphere, a high vacuum of 10 −3 Torr or less is preferable to prevent oxidation of Cu. This is because in an oxidizing atmosphere or in a low vacuum of 10 −3 Torr or more, the Cu layer provided on the surface of the stainless steel sheet is oxidized and does not diffuse into the surface layer of the stainless steel sheet, so that antibacterial properties cannot be imparted.
【００２８】（４）加熱温度：Ｃｕ層の融点以上、１３
００℃未満 Ｃｕ層の融点以上１３００℃未満で熱処理することによ
り、ステンレス鋼板表層部にＣｕが拡散され、抗菌性を
付与することができる。Ｃｕ層の融点未満の温度では、
Ｃｕの拡散が不十分となり抗菌性を確保することができ
ない。また、１３００℃以上では、Ｃｕ蒸発による加熱
炉の損傷および寿命低下が生じ、実操業上実用的でな
い。したがって、熱処理温度はＣｕ層の融点以上１３０
０℃未満とする。なお、保持時間は加熱温度により異な
るが約１０分以内でよく、高温ほど保持時間は短くてよ
い。純Ｃｕの融点は１０８３℃である。(4) Heating temperature: equal to or higher than the melting point of the Cu layer, 13
Less than 00 ° C. By performing heat treatment at a temperature equal to or higher than the melting point of the Cu layer and less than 1300 ° C., Cu is diffused into the surface layer portion of the stainless steel plate, and antibacterial properties can be imparted. At temperatures below the melting point of the Cu layer,
The diffusion of Cu becomes insufficient, and the antibacterial property cannot be secured. If the temperature is 1300 ° C. or higher, the heating furnace is damaged and the life is shortened due to the evaporation of Cu, which is not practical in actual operation. Therefore, the heat treatment temperature is equal to or higher than the melting point of the Cu
It should be less than 0 ° C. The holding time varies depending on the heating temperature, but may be about 10 minutes or less. The higher the temperature, the shorter the holding time. The melting point of pure Cu is 1083 ° C.
【００２９】非酸化性雰囲気中でのステンレス鋼板の加
熱は、連続焼鈍炉またはバッチ式焼鈍炉を用いておこな
うことができる。The heating of the stainless steel sheet in the non-oxidizing atmosphere can be performed using a continuous annealing furnace or a batch type annealing furnace.
【００３０】（５）ステンレス鋼板表層へのＣｕの拡散 Ｃｕは、抗菌作用のある金属として知られているが、本
発明においてもＣｕの抗菌作用を利用するため、ステン
レス鋼板の表層部にＣｕを拡散させる。抗菌性は、水分
によりイオン化したＣｕが、細菌の呼吸、代謝を行うた
めに必要な酵素中のチオール基とよく反応し、チオール
基を不活性化させることに起因すると考えらる。(5) Diffusion of Cu into the Surface Layer of Stainless Steel Sheet Cu is known as a metal having an antibacterial action. However, in the present invention, Cu is added to the surface layer of the stainless steel sheet to utilize the antibacterial action of Cu. Spread. It is considered that the antibacterial property is caused by the fact that Cu ionized by water reacts well with the thiol group in the enzyme necessary for respiration and metabolism of bacteria, and inactivates the thiol group.
【００３１】ステンレス鋼板の表面にＣｕ富化層を設け
る手段として、化学的Ｃｕめっき、メカニカルＣｕめっ
き法および圧延接合法等による被覆が考えられるが、こ
れらの被覆層はステンレス鋼に較べて耐酸化性および耐
食性に劣る。また、ステンレス鋼特有の金属光沢が被膜
により見えなくなり、意匠性にも問題がある。しかし、
Ｃｕ拡散層は、表層部にＣｒ、Ｃｕの濃化層が生成され
るので酸化されにくく耐食性に優れており、ステンレス
鋼の金属光沢も有している。したがって、本発明では表
面にＣｕ層を設けたステンレス鋼板を高温に加熱して、
Ｃｕを拡散させる。As a means for providing a Cu-enriched layer on the surface of a stainless steel plate, coating by chemical Cu plating, mechanical Cu plating, rolling joining, or the like can be considered, but these coating layers are more oxidation-resistant than stainless steel. Poor resistance and corrosion resistance. In addition, the metallic luster inherent to stainless steel becomes invisible due to the coating, and there is also a problem in design. But,
The Cu diffusion layer is not easily oxidized because a concentrated layer of Cr and Cu is generated on the surface layer portion, has excellent corrosion resistance, and has a metallic luster of stainless steel. Therefore, in the present invention, a stainless steel plate having a surface provided with a Cu layer is heated to a high temperature,
Diffusion of Cu.
【００３２】[0032]
【実施例】下記寸法のフェライト系ステンレス鋼、ＪＩ
Ｓ ＳＵＳ４３０）の冷延鋼帯と、コイル状のＪＩＳ
Ｈ ３１００で規定されている無酸素銅（Ｃ１０２０）
を用い、圧延接合法によりステンレス鋼帯にＣｕを積層
させたクラッドコイルを製造した。なお、冷延鋼帯は、
通常の方法による熱間圧延し、焼鈍とデスケーリングを
施した後冷間圧延して得られたものである。この冷延鋼
帯が製造されるまでは、Ｃｕの添加やＣｕ富化処理が施
されていないので、熱間加工時の加工性はとくに問題は
なかった。EXAMPLE Ferritic stainless steel of the following dimensions, JI
S SUS430) cold rolled steel strip and coiled JIS
Oxygen-free copper specified by H 3100 (C1020)
Was used to produce a clad coil in which Cu was laminated on a stainless steel strip by a rolling joining method. The cold-rolled steel strip is
It is obtained by hot rolling by a usual method, annealing and descaling, and then cold rolling. Until this cold-rolled steel strip was manufactured, the addition of Cu and the Cu enrichment treatment were not performed, so that there was no particular problem in the workability during hot working.
【００３３】 ＳＵＳ４３０ ：板厚１．０ｍｍ、板幅１００ｍｍ Ｃ １０２０ ：板厚０．１ｍｍ、板幅１００ｍｍ 圧延接合は、圧下率を５２〜９７％と種々変えて室温で
圧延することにより積層したＣｕの厚さを表１に示すよ
うに５〜３５μｍと変化させた。SUS430: sheet thickness 1.0 mm, sheet width 100 mm C 1020: sheet thickness 0.1 mm, sheet width 100 mm Rolling joining was performed by rolling at room temperature with various reduction ratios of 52 to 97%. Was changed to 5 to 35 μm as shown in Table 1.
【００３４】[0034]
【表１】 [Table 1]
【００３５】次いで、バッチ式の真空焼鈍炉を用いて、
表１に示す１０００〜１３００℃と加熱温度を種々変化
させてクラッドコイルにＣｕの拡散処理を施した。な
お、加熱時間は目標温度に到達した後１０分とした。Next, using a batch type vacuum annealing furnace,
The clad coil was subjected to a Cu diffusion treatment by varying the heating temperature from 1000 to 1300 ° C. shown in Table 1. The heating time was 10 minutes after reaching the target temperature.
【００３６】また、比較のためクラッドコイルの大気中
での拡散処理も実施した。For comparison, a diffusion treatment of the clad coil in the air was also performed.
【００３７】拡散処理したコイルの板幅中央部から幅５
０ｍｍ、長さ５０ｍｍの抗菌性調査用の試験片を採取し
た。Width 5 from center of plate width of diffused coil
A test piece of 0 mm and a length of 50 mm for antibacterial investigation was collected.
【００３８】抗菌性の調査は、大腸菌および黄色ブドウ
球菌を用い、前者は１％ペプトン培地、後者は７．５％
ＮａＣｌ加ペプトン液で増菌後、それぞれ減菌リン酸緩
衝生理食塩水で菌液を調整し、試験片の表面に１ミリリットル
を塗抹し、２５℃で２４時間静置した。The antibacterial activity was determined using Escherichia coli and Staphylococcus aureus. The former was 1% peptone medium, and the latter was 7.5%.
After enrichment with NaCl-added peptone solution, the bacterial solution was adjusted with sterile phosphate buffered saline, and 1 ml of the solution was smeared on the surface of the test piece and allowed to stand at 25 ° C. for 24 hours.
【００３９】静置後、試供菌液塗抹部分をタンポンで拭
き取り、タンポンを１０ミリリットルの減菌リン酸緩衝生理食
塩水中に振り出した。大腸菌はその振り出し液１ミリリットル
をデゾキシコレート寒天培地に混釈して３７℃で２４時
間培養し、発生した集落数を計測した。After standing, the smeared portion of the sample solution was wiped off with a tampon, and the tampon was shaken into 10 ml of sterile phosphate buffered saline. Escherichia coli was mixed with 1 ml of the shake-out solution on a desoxycholate agar medium and cultured at 37 ° C. for 24 hours, and the number of colonies generated was counted.
【００４０】黄色ブドウ球菌は振り出し液０．１ミリリットル
を卵黄加マンニット食塩培地に重層して３７℃で２４時
間培養し、発生した集落数を計測した。この調査結果か
ら、初期値と較べ、減菌率を計算した。その結果を表１
に示す。For Staphylococcus aureus, 0.1 ml of the shake-out solution was overlaid on a mannitol salt medium supplemented with yolk and cultured at 37 ° C. for 24 hours, and the number of colonies generated was counted. From the results of this survey, the sterilization rate was calculated as compared with the initial value. Table 1 shows the results.
Shown in
【００４１】減菌率９９％以上のものを抗菌性が高いも
のと評価した。減菌率９９％未満については、抗菌性の
低いものまたは抗菌効果のないものと評価した。Those having a sterilization rate of 99% or more were evaluated as having high antibacterial properties. A sterilization rate of less than 99% was evaluated as having low antibacterial activity or having no antibacterial effect.
【００４２】また、拡散処理後のステンレス鋼板の耐食
性を調べるため塩水噴霧試験をおこなった。Further, a salt spray test was conducted to examine the corrosion resistance of the stainless steel sheet after the diffusion treatment.
【００４３】塩水噴霧試験は、ＪＩＳ Ｚ ２３７１に
従って実施し、試験時間１０００時間後にステンレス鋼
板表面の発錆状況を目視観察により１０段階に評価し
た。これをレイティングナンバーと呼び、全面発錆した
場合をレイティングナンバー１とし、肉眼で全く発錆の
認められない場合をレイティングナンバー１０とした。
表１より明らかなように、本発明の方法で製造したステ
ンレス鋼板は比較法で製造したものと較べて、大腸菌と
黄色ブドウ球菌の両者に対し高い抗菌性を有している。The salt spray test was carried out in accordance with JIS Z 2371. After 1000 hours of the test, the surface of the stainless steel plate was evaluated for rust on a 10-point scale by visual observation. This was called a rating number. A rating of 1 was given when the entire surface was rusted, and a rating of 10 was given when no rust was observed with the naked eye.
As is clear from Table 1, the stainless steel sheet manufactured by the method of the present invention has higher antibacterial activity against both Escherichia coli and Staphylococcus aureus than the one manufactured by the comparative method.
【００４４】また、耐食性についても本発明の方法で製
造したステンレス鋼板は、すべてレイティングナンバー
１０と優れている。しかし、ステンレス鋼にＣｕ層を３
５μｍと厚く積層した後、拡散処理したステンレス鋼板
は、レイティングナンバー５であり、耐食性に劣ってい
ることが分かる。Further, stainless steel sheets produced by the method of the present invention are all excellent in corrosion resistance, with a rating number of 10. However, three layers of Cu on stainless steel
The stainless steel sheet subjected to the diffusion treatment after being laminated as thick as 5 μm has a rating number of 5 and shows that it is inferior in corrosion resistance.
【００４５】なお、総合評価は抗菌性と耐食性に優れた
ステンレス鋼のみを表１中の記号”○”で、それ以外は
抗菌性不良と判断して記号”×”で表記した。In the comprehensive evaluation, only stainless steel having excellent antibacterial properties and corrosion resistance was marked with a symbol “記号” in Table 1, and the others were marked with a symbol “x” as judged to be poor in antibacterial properties.
【００４６】[0046]
【発明の効果】従来の表面に被膜を備えた抗菌性ステン
レス鋼板の有する問題は、ステンレス鋼板自身に抗菌性
を付与する本発明の製造方法により解消され、また熱間
加工時には鋼中へのＣｕの添加や富化処理がなされてい
ないので加工性の劣化がないので抗菌性と耐食性に優れ
たステンレス鋼を安価に製造することができる。The problem of the conventional antibacterial stainless steel sheet having a coating on its surface is solved by the manufacturing method of the present invention for imparting antibacterial properties to the stainless steel sheet itself, and Cu is added to the steel during hot working. Since no addition or enrichment treatment is performed, there is no deterioration in workability, so that stainless steel excellent in antibacterial properties and corrosion resistance can be manufactured at low cost.
Claims (1)
μmのＣｕ層を設け、非酸化性雰囲気中で前記Ｃｕ層の
融点以上、１３００℃未満の温度範囲内に加熱して、ス
テンレス鋼板の表層部にＣｕを拡散させることを特徴と
する抗菌性を有するステンレス鋼板の製造方法。1. A stainless steel plate having a thickness of 5 to 25
The antibacterial property is provided by providing a Cu layer having a thickness of μm and heating the same in a non-oxidizing atmosphere to a temperature range of not less than the melting point of the Cu layer and less than 1300 ° C. to diffuse Cu into the surface layer portion of the stainless steel sheet. Method for producing a stainless steel sheet having:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10140738A JPH11335810A (en) | 1998-05-22 | 1998-05-22 | Production of stainless steel sheet having antifungal property |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10140738A JPH11335810A (en) | 1998-05-22 | 1998-05-22 | Production of stainless steel sheet having antifungal property |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11335810A true JPH11335810A (en) | 1999-12-07 |
Family
ID=15275571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10140738A Withdrawn JPH11335810A (en) | 1998-05-22 | 1998-05-22 | Production of stainless steel sheet having antifungal property |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11335810A (en) |
-
1998
- 1998-05-22 JP JP10140738A patent/JPH11335810A/en not_active Withdrawn
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