JP2019085616A - Manufacturing method of stainless steel plate - Google Patents
Manufacturing method of stainless steel plate Download PDFInfo
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本発明は、化学研磨を用いたステンレス鋼板の製造方法に関する。とくに熱延焼鈍後または冷延焼鈍後のステンレス鋼板に化学研磨を施す製造方法に関する。 The present invention relates to a method of manufacturing a stainless steel plate using chemical polishing. In particular, the present invention relates to a manufacturing method of subjecting a stainless steel sheet after hot-rolling annealing or after cold-rolling annealing to chemical polishing.
ステンレス鋼は、耐食性が高い素材であるから、耐食性を付与する表面処理を施す必要がない。そのため、ステンレス鋼製品は、表面処理を施さないで無垢の表面形態で使用されることが通常である。熱間圧延、焼鈍及び酸洗が行われた後のステンレス鋼板の表面には、各処理に起因して種々の表面欠陥が発生する場合がある。例えば、熱間圧延時に生じる表面割れに起因する「ヘゲ疵」（表面が薄片状に剥離した疵、または、部分的に剥離した状態の疵）、焼鈍酸洗工程で施されたメカニカルデスケールに起因する「カサブタ状欠陥」などが知られている。 Since stainless steel is a material having high corrosion resistance, it is not necessary to apply surface treatment to impart corrosion resistance. Therefore, stainless steel products are generally used in plain surface form without surface treatment. Various surface defects may occur on the surface of the stainless steel sheet after hot rolling, annealing and pickling, due to each treatment. For example, “Hedge” (wrinkled with flaky surface or wrinkles in partially exfoliated state) due to surface cracks generated during hot rolling, mechanical descaling applied in annealing and pickling process Known "cassular defects" and the like are known.
また、ステンレス鋼材の用途によっては、美麗な表面品質が求められる。上記の表面欠陥が発生したときは、研磨ベルトなどによる機械研磨を用いて、表面欠陥を機械的に削り取る処理が行われる。しかし、機械研磨を行うと、研磨後の表面には研磨目が残存し、最表層には硬質層が発生する。この研磨目から中間の冷間圧延時に微細な割れが発生し、仕上圧延後の最終製品においてスクラッチ状の欠陥として残存する場合がある。 Also, depending on the application of stainless steel, beautiful surface quality is required. When the surface defects described above occur, mechanical polishing with a polishing belt or the like is used to mechanically remove the surface defects. However, when mechanical polishing is performed, a polished grain remains on the surface after polishing, and a hard layer is generated on the outermost layer. Fine cracks may occur during this process from the polishing eye during intermediate cold rolling, and may remain as scratch-like defects in the final product after finish rolling.
ステンレス鋼板の表面に生じた欠陥は、表面を研磨することによって除去される。例えば、ステンレス鋼板の表面を研磨する方法に関しては、特許文献１に、ステンレス鋼の表面を艶消し状にするため、機械的研磨による研磨傷を付与する表面研磨仕上げが行われる。その後、表面研磨仕上げにより局部的に生じた耐食性に劣る表面層を、化学研磨または電解研磨により溶解除去する処理方法が記載されている。特許文献２に、化学研磨作用を有するシュウ酸水溶液に、機械研磨作用を有する研磨砥粒を分散させた研磨液を用いて、ステンレス鋼を鏡面研磨して仕上げる方法が記載されている。
Defects generated on the surface of the stainless steel plate are removed by polishing the surface. For example, with regard to a method of polishing the surface of a stainless steel plate, in order to make the surface of the stainless steel matt as described in
上記の特許文献１、２は、ステンレス鋼の表面を化学研磨する方法を記載している。しかし、いずれも仕上げ処理としての化学研磨を開示しており、熱延焼鈍または冷延焼鈍を行った後のステンレス鋼における表面欠陥に係る課題及び課題解決を示唆するものではない。そこで、本発明は、熱延焼鈍または冷延焼鈍を行った後のステンレス鋼に発生した表面欠陥を解消し、美麗な表面を備えたステンレス鋼板の製造方法を提供することを目的とする。
The above-mentioned
本発明者らは、熱延工程または冷延工程における焼鈍後のステンレス鋼板を、酸および界面活性剤を含む溶液中に浸漬することにより、ステンレス鋼板の表面の突起部が優先的に溶解されることに着目し、本発明を完成するに至った。具体的には、本発明は、以下のものを提供する。 By immersing the stainless steel plate after annealing in the hot rolling process or the cold rolling process in a solution containing an acid and a surfactant, the projections on the surface of the stainless steel plate are preferentially dissolved. The present invention has been completed with attention paid to Specifically, the present invention provides the following.
（１）本発明は、熱延焼鈍後または冷延焼鈍後のステンレス鋼板を、酸および界面活性剤を含む溶液中に浸漬し、当該ステンレス鋼板の表面を２ｍｇ／ｃｍ２以上溶解させる化学研磨を施す工程を含む、ステンレス鋼板の製造方法である。 (1) The present invention immerses a stainless steel plate after hot-rolled annealing or cold-rolled annealing in a solution containing an acid and a surfactant to dissolve the surface of the stainless steel plate by 2 mg / cm 2 or more. It is a manufacturing method of a stainless steel plate including the process of giving.
（２）本発明は、前記溶液が、塩酸、硝酸、リン酸および酢酸からなる群から選択された２種以上が混合された酸液と、界面活性剤と、有機化合物、無機化合物および有機溶媒からなる群から選択された２種以上とを含む、（１）に記載のステンレス鋼板の製造方法である。 (2) In the present invention, an acid solution in which two or more selected from the group consisting of hydrochloric acid, nitric acid, phosphoric acid and acetic acid are mixed, a surfactant, an organic compound, an inorganic compound and an organic solvent It is a manufacturing method of a stainless steel plate given in (1) containing two or more sorts chosen from a group which consists of.
（３）本発明は、前記溶液中の浸漬時間が、１ｍｉｎ以上である、（１）に記載のステンレス鋼板の製造方法である。 (3) The present invention is the method for producing a stainless steel plate according to (1), wherein the immersion time in the solution is 1 min or more.
（４）本発明は、前記化学研磨が施されたステンレス鋼板は、中間圧延または仕上圧延を含む処理が施される、（１）に記載のステンレス鋼板の製造方法である。 (4) The present invention is the method for producing a stainless steel plate according to (1), wherein the stainless steel plate subjected to the chemical polishing is subjected to a process including intermediate rolling or finish rolling.
本発明によれば、熱延焼鈍後または冷延焼鈍後のステンレス鋼板は、平滑な表面を有するものが得られる。その後の製造工程において、さらに中間圧延、仕上圧延などの加工が施されても、鋼板表面に欠陥の発生が抑制されるため、美麗な表面を備えた最終製品を得ることができる。 According to the present invention, a stainless steel sheet after hot-rolled annealing or after cold-rolled annealing can be obtained that has a smooth surface. In the subsequent manufacturing process, even if processing such as intermediate rolling and finish rolling is further performed, the occurrence of defects on the steel sheet surface is suppressed, so that it is possible to obtain a final product having a beautiful surface.
以下、本発明の実施形態について説明する。本発明は、これらの記載により限定されるものではない。 Hereinafter, embodiments of the present invention will be described. The present invention is not limited by these descriptions.
本実施形態に係るステンレス鋼板の製造方法は、熱延焼鈍後のステンレス鋼板を、酸および界面活性剤を含む溶液中に浸漬し、鋼板表面を溶解させる化学研磨を施す工程を含むものである。本実施形態に係る化学研磨処理は、熱延焼鈍後のステンレス鋼板に適用できる。熱延焼鈍及び酸洗が施された後、研削ブラシ等によるメカニカルデスケールが施されたステンレス鋼板に対しても適用できる。 The method of manufacturing a stainless steel plate according to the present embodiment includes the step of performing chemical polishing in which the stainless steel plate after hot-rolled annealing is immersed in a solution containing an acid and a surfactant to dissolve the surface of the steel plate. The chemical polishing process according to the present embodiment can be applied to the stainless steel sheet after hot rolling annealing. The invention is also applicable to a stainless steel plate which has been subjected to mechanical de-scaling with a grinding brush or the like after being subjected to hot rolling annealing and pickling.
図１は、本実施形態に係るステンレス鋼板の製造方法の一例を示す図である。ステンレス鋼板については、スラブを熱間圧延して熱延板とした後、焼鈍処理および酸洗処理を経て、熱延焼鈍板が製造される。焼鈍および酸洗工程においては、焼鈍後にメカニカルデスケールを行い、酸洗後にブラシ研削が行われることがある。また、焼鈍および酸洗後に、熱延焼鈍板の表面疵を除去するために、研磨ベルトなどによる機械研磨が行われる場合もある。その後、熱延焼鈍板に冷間圧延（中間焼鈍及び酸洗を含む）が施されて、冷延焼鈍板を製造するのが一般的である。用途によっては、さらに、仕上圧延（仕上焼鈍、酸洗、光輝焼鈍等を含む）が施される。また、その後、調質圧延、ダル圧延、エンボス圧延、研磨などの仕上処理が施されることもある。得られたステンレス鋼板は、各種形状に成形加工される。 FIG. 1 is a view showing an example of a method of manufacturing a stainless steel plate according to the present embodiment. With respect to stainless steel plates, the slabs are hot-rolled into hot-rolled sheets, and then subjected to annealing and pickling to produce hot-rolled annealed sheets. In the annealing and pickling process, mechanical descaling may be performed after the annealing and brush grinding may be performed after the pickling. In addition, after the annealing and pickling, mechanical polishing with a polishing belt or the like may be performed in order to remove surface wrinkles of the hot-rolled annealed plate. Thereafter, the hot-rolled annealed sheet is generally subjected to cold rolling (including intermediate annealing and pickling) to produce a cold-rolled annealed sheet. Depending on the application, finish rolling (including finish annealing, pickling, bright annealing, etc.) is further applied. After that, finishing treatments such as temper rolling, dull rolling, embossing rolling, and polishing may be performed. The obtained stainless steel plate is formed into various shapes.
本明細書においては、熱間圧延、焼鈍及び酸洗を経て得られたステンレス鋼板を「熱延焼鈍後のステンレス鋼板」または「熱延焼鈍鋼板」ということがある。冷間圧延、焼鈍を経て得られたステンレス鋼板を「冷延焼鈍後のステンレス鋼板」または「冷延焼鈍鋼板」ということがある。 In the present specification, a stainless steel plate obtained through hot rolling, annealing and pickling may be referred to as “stainless steel plate after hot rolling annealing” or “hot rolled annealing steel plate”. The stainless steel plate obtained through cold rolling and annealing may be referred to as "stainless steel plate after cold rolling annealing" or "cold rolling annealed steel plate".
熱延焼鈍後のステンレス鋼板の表面には、熱間圧延や焼鈍・酸洗などの各工程で生じた欠陥が残存する場合がある。また、熱延焼鈍鋼板の表面欠陥に起因し、冷延焼鈍後のステンレス鋼板においても表面欠陥が残存している場合がある。その表面欠陥を効率的に除去するためには、ステンレス鋼板に化学研磨処理を施すことが好ましい。本実施形態の化学研磨処理は、酸および界面活性剤を含む溶液中に浸漬し、鋼板の表面を一定量以上で溶解することにより、バリ、粒界浸食溝、ヘゲ疵などの凹凸状に存在する表面欠陥および機械研磨による表面の硬質層を十分に除去することができて、鋼板表面の平滑性が向上する。２ｍｇ／ｃｍ２未満であると、表面欠陥の除去が不十分であり、良好な平滑面が得られないため、２ｍｇ／ｃｍ２以上を溶解することが好ましい。他方、溶解量が過多であると、表面部分の溶解が過度に進行し、炭化物の付着（スマット）の発生を招く可能性があるので、経済性の観点から６０ｍｇ／ｃｍ２以下でよい。 On the surface of the stainless steel sheet after hot-rolled annealing, defects generated in each process such as hot rolling, annealing and pickling may remain. Moreover, surface defects may remain even in the stainless steel sheet after cold rolling annealing due to the surface defects of the hot-rolled and annealed steel sheet. In order to remove the surface defects efficiently, it is preferable to subject the stainless steel plate to a chemical polishing treatment. The chemical polishing process of the present embodiment is immersed in a solution containing an acid and a surfactant, and the surface of the steel plate is dissolved by a certain amount or more, thereby forming irregularities such as burrs, intergranular erosion grooves, and thorns. The surface defects present and the hard layer on the surface by mechanical polishing can be sufficiently removed to improve the smoothness of the steel sheet surface. If it is less than 2 mg / cm 2 , removal of surface defects is insufficient and a good smooth surface can not be obtained, so it is preferable to dissolve 2 mg / cm 2 or more. On the other hand, if the amount of dissolution is excessive, the dissolution of the surface part proceeds excessively, which may cause the occurrence of carbide adhesion (smut), and therefore it may be 60 mg / cm 2 or less from the economical point of view.
本実施形態は、化学研磨液が、塩酸、硝酸、リン酸および酢酸からなる群から選択された２種以上が混合された酸液と、界面活性剤と、有機化合物、無機化合物および有機溶媒からなる群から選択された２種以上とを含むことが好ましい。例えば、エスクリーンＳ−２００ＬＳ（佐々木化学薬品株式会社製）のような塩酸、硝酸、リン酸および酢酸が混合された酸液と界面活性剤と有機溶媒を含有する化学研磨液や、＃５０７Ｎ（株式会社横浜ネプロス製）のような塩酸および硝酸が混合された酸液と有機化合物と界面活性剤と有機溶媒を含有する化学研磨液を使用してもよい。 In the present embodiment, the chemical polishing liquid comprises an acid solution in which two or more selected from the group consisting of hydrochloric acid, nitric acid, phosphoric acid and acetic acid are mixed, a surfactant, an organic compound, an inorganic compound and an organic solvent. It is preferable to include two or more selected from the group consisting of For example, a chemical polishing solution containing an acid solution in which hydrochloric acid, nitric acid, phosphoric acid and acetic acid are mixed, surfactant and an organic solvent such as EScreen S-200LS (manufactured by Sasaki Chemical Co., Ltd.), # 507N ( A chemical polishing solution containing an acid solution mixed with hydrochloric acid and nitric acid, such as Yokohama Nepros Co., Ltd., an organic compound, a surfactant and an organic solvent may be used.
本実施形態は、熱延焼鈍後のステンレス鋼板、当該ステンレス鋼板に研磨ベルトなどによる機械研磨が施された後のステンレス鋼板、または、冷延焼鈍後のステンレス鋼板などのステンレス鋼板を化学研磨用溶液に浸漬し、表面欠陥を除去する。浸漬時間が短いと、表面欠陥を十分に除去することができない。そのため、浸漬時間は、対象となる表面欠陥により異なるが、機械研磨による表面の硬質層には１ｍｉｎ以上、バリや粒界浸食溝には２ｍｉｎ以上、ヘゲ疵には５ｍｉｎ以上であることが好ましい。表面性状に応じて、６ｍｉｎ以上、８ｍｉｎ以上であってもよい。他方、浸漬時間が過度に長いと、鋼板表面に炭化物の付着（スマット）が発生する場合がある。また、作業時間が長くなるので、経済性の観点からも１０ｍｉｎ程度まで浸漬すればよい。 In this embodiment, a solution for chemical polishing a stainless steel plate after hot-rolled annealing, a stainless steel plate after mechanical polishing with an abrasive belt or the like is performed on the stainless steel plate, or a stainless steel plate such as a stainless steel plate after cold rolling annealing. Dip into the surface to remove surface defects. If the immersion time is short, surface defects can not be sufficiently removed. Therefore, the immersion time varies depending on the target surface defect, but is preferably 1 min or more for the hard layer on the surface by mechanical polishing, 2 min or more for burrs and intergranular erosion grooves, and 5 min or more for hesitation . Depending on the surface quality, it may be 6 minutes or more and 8 minutes or more. On the other hand, if the immersion time is excessively long, carbide adhesion (smut) may occur on the steel sheet surface. In addition, since the working time becomes long, it may be immersed for about 10 minutes also from the viewpoint of economy.
本実施形態に係る化学研磨が施された熱延焼鈍後のステンレス鋼板は、中間圧延（中間焼鈍及び酸洗を含む）及び仕上圧延を含む処理工程に送られて、冷延焼鈍鋼板にされる。仕上圧延が行われた後は、仕上焼鈍、調質圧延をしてもよい。得られたステンレス鋼板は、各種用途の製品素材として使用され、製品形状に成形加工される。 The stainless steel sheet after hot-rolled annealing subjected to chemical polishing according to the present embodiment is sent to a processing step including intermediate rolling (including intermediate annealing and pickling) and finish rolling to be a cold-rolled annealed steel sheet . After finish rolling is performed, finish annealing and temper rolling may be performed. The obtained stainless steel plate is used as a product material for various uses, and is processed into a product shape.
本発明に適用されるステンレス鋼板の鋼種は、制限されるものではない。フェライト系ステンレス鋼（例えばＳＵＳ４３０）、オーステナイト系ステンレス鋼（例えばＳＵＳ３０４）などを用いることができる。公知の製造方法により、熱間圧延、焼鈍・酸洗、メカニカルデスケールなどの各工程を経て製造された鋼板に適用できる。 The steel type of the stainless steel sheet applied to the present invention is not limited. Ferritic stainless steel (for example, SUS430), austenitic stainless steel (for example, SUS304) or the like can be used. It can apply to the steel plate manufactured through each process, such as hot rolling, annealing / acid washing, mechanical de-scaling, with a publicly known manufacturing method.
以下、本発明の実施例について説明する。本発明は、以下の説明に限定されない。 Hereinafter, examples of the present invention will be described. The invention is not limited to the following description.
表１に示すように４つの試験用の鋼板Ｎｏ．１〜Ｎｏ．４を用意した。フェライト系フェライト鋼としてＳＵＳ４３０ＪＩＬ、オーステナイト系ステンレス鋼としてＳＵＳ３０４の２種のステンレス鋼を用いた。常法によりスラブを、加熱炉内で１２３０℃、２ｈ加熱後、圧下率９８％の熱間圧延を行い、板厚４ｍｍの熱延鋼板を製造した。次いで、熱延鋼板に１０６０℃、２ｍｉｎの焼鈍を施した後、メカニカルデスケールおよび酸洗処理を行った。上記のメカニカルデスケールにおいては、スケールブレーカ処理後にショットブラスト処理を施して、次いで酸洗処理を施した。当該酸洗処理では、酸液に浸漬する毎にその後に砥粒入りブラシで研削処理を施した。これらの各処理によって得られた熱延焼鈍鋼板を鋼板Ｎｏ．１、鋼板Ｎｏ．２として用いた。 As shown in Table 1, steel plate No. 4 for four tests. 1 to No. I prepared four. Two types of stainless steels, SUS430 JIL, were used as ferrite-based ferritic steels and SUS304 as austenitic stainless steels. The slab was subjected to hot rolling at a rolling reduction of 98% after heating at 1230 ° C. for 2 h in a heating furnace by a conventional method to produce a hot-rolled steel plate having a thickness of 4 mm. Next, the heat-rolled steel plate was annealed at 1060 ° C. for 2 minutes, and then subjected to mechanical de-scale and pickling treatment. In the above mechanical descaling, shot blasting was performed after scale breaker processing, and then pickling was performed. In the said pickling process, whenever it immersed in an acid liquid, the grinding process was performed by the brush containing an abrasive grain after that. The hot-rolled annealed steel sheet obtained by each of these treatments is called steel sheet No. 1, steel plate No. Used as 2.
鋼板Ｎｏ．３は、鋼板Ｎｏ．２に対して、さらに研磨ベルトなどによる機械研磨を施して作製した熱延焼鈍鋼板である。鋼板Ｎｏ．４は、鋼板Ｎｏ．１と同じ工程で熱延焼鈍鋼板を作製した後、冷間圧延、焼鈍処理および酸洗処理を施して作製した板厚２ｍｍの冷延焼鈍鋼板である。 Steel plate No. No. 3 is steel plate No. No. 2 is a hot-rolled annealed steel sheet produced by further performing mechanical polishing with a polishing belt or the like. Steel plate No. No. 4 steel plate No. This is a cold-rolled and annealed steel sheet having a thickness of 2 mm which is manufactured by applying a cold rolling, an annealing treatment and an acid pickling treatment after producing a hot-rolled and annealed steel plate in the same process as 1).
このような圧延、メカニカルデスケール、酸洗などの各処理が施された結果、鋼板Ｎｏ．１〜Ｎｏ．４の表面状態は、表１に示すような表面欠陥が発生した。 As a result of each treatment such as rolling, mechanical descale, pickling, etc., steel plate No. 1 is obtained. 1 to No. In the surface state of 4, surface defects as shown in Table 1 occurred.
得られた試験用の鋼板Ｎｏ．１〜Ｎｏ．４において、５０ｍｍ×２５ｍｍの寸法の試験材を切り出した。試験材の表面をアセトンにより脱脂した後、当該試験材を化学研磨液中に浸漬して化学研磨を行った。所定の浸漬時間を経過した後、試験材を化学研磨液から引き上げて、水洗した後、アセトン脱脂、乾燥を行った。得られた試験材を評価試験に供した。浸漬時間（以下、「化学研磨時間」ということもある。）は、１ｍｉｎ、２ｍｉｎ、５ｍｉｎ、１０ｍｉｎとした。 The steel plate No. 1 to No. In 4, the test material of the dimension of 50 mm x 25 mm was cut out. The surface of the test material was degreased with acetone, and then the test material was immersed in a chemical polishing solution to carry out chemical polishing. After a predetermined immersion time had elapsed, the test material was pulled out of the chemical polishing solution, washed with water, and then subjected to acetone degreasing and drying. The obtained test material was subjected to the evaluation test. The immersion time (hereinafter sometimes referred to as “chemical polishing time”) was set to 1 min, 2 min, 5 min, and 10 min.
化学研磨液は、エスクリーンＳ−２００ＬＳ（佐々木化学薬品株式会社製）を用いた。当該研磨液は、販売会社の説明書によると、エスクリーンＳ−２００ＬＳ−Ａ（主剤）と、エスクリーンＳ−２００ＬＳ−Ｂ（光沢剤）とを混合して調製した水溶液であり、前者のＡ液は、酸液に相当し、リン酸１６％、硝酸１０％超、塩酸７％、酢酸４％を含有し、後者のＢ液は、アルコール系溶剤５０〜６０％、カチオン系界面活性剤５〜１５％を含有する。本試験の化学研磨液は、Ａ液、Ｂ液、水を、１０００：４３：１０００の配合比で混合して調製した。処理温度（９３〜９５℃）に加熱した化学研磨液中に試験材を浸漬し、化学研磨を行った。 As a chemical polishing solution, Escreen S-200 LS (manufactured by Sasaki Chemical Co., Ltd.) was used. The polishing solution is an aqueous solution prepared by mixing Escreen S-200 LS-A (main agent) and Escreen S-200 LS-B (brightening agent) according to the manufacturer's instruction. The solution corresponds to an acid solution and contains 16% phosphoric acid, 10% nitric acid, 7% hydrochloric acid and 4% acetic acid, and the latter solution B contains 50 to 60% alcohol solvent, cationic surfactant 5 Contains 15%. The chemical polishing solution of this test was prepared by mixing solution A, solution B, and water at a compounding ratio of 1000: 43: 1000. The test material was immersed in a chemical polishing solution heated to a treatment temperature (93 to 95 ° C.) to carry out chemical polishing.
（評価試験）
化学研磨液に浸漬する前と浸漬する後において、それぞれ試験材の表面性状を観察し、また、重量および板厚を測定した。
(Evaluation test)
Before and after immersion in the chemical polishing solution, the surface properties of the test material were observed, and the weight and thickness were measured.
化学研磨前の試験材は、表１に示すように、鋼板Ｎｏ．１、Ｎｏ．２の表面には、ショット痕のバリ、粒界浸食溝が存在していた。鋼板Ｎｏ．３は、鋼板Ｎｏ．２の表面に機械研磨を施すことによって、バリなどの表面欠陥が除去された一方で、機械研磨に起因する研磨目や硬質層が存在した。鋼板Ｎｏ．４の表面には、ヘゲ疵が存在していた。 As shown in Table 1, the test materials before chemical polishing were steel plate No. 1, No. On the surface of 2, there were burrs of shot marks and intergranular erosion grooves. Steel plate No. No. 3 is steel plate No. By subjecting the surface of No. 2 to mechanical polishing, surface defects such as burrs were removed, while polishing marks and a hard layer resulting from mechanical polishing were present. Steel plate No. On the surface of 4, hesage was present.
それに対し、化学研磨を施した後の鋼板Ｎｏ．１、鋼板Ｎｏ．２は、化学研磨時間が２ｍｉｎであると、バリや粒界浸食溝のような表面欠陥の多くが消失し、５ｍｉｎ以上であると、ほぼ消失した。また、化学研磨を施した後の鋼板Ｎｏ．４は、化学研磨時間が５ｍｉｎ以上であると、ヘゲ疵のカサブタが無くなって窪みになり、鋼板表面の平滑性が良好であった。 On the other hand, steel plate No. 1 after chemical polishing was applied. 1, steel plate No. In No. 2, most of surface defects such as burrs and intergranular erosion grooves disappeared when the chemical polishing time was 2 minutes, and almost disappeared when the chemical polishing time was 5 minutes or more. In addition, steel plate No. 1 after chemical polishing was applied. In No. 4 of the above, when the chemical polishing time is 5 minutes or more, the sheath of the spatula disappears and becomes hollow, and the surface smoothness of the steel sheet is good.
図２は、化学研磨時間（ｍｉｎ）に対する試験材の重量減少量（ｍｇ／ｃｍ２）の変化を示す。化学研磨作用により試験材の表面が溶解されるため、化学研磨時間の経過につれて重量減少量が増加した。化学研磨時間が１ｍｉｎ以上で重量減少量が２ｍｇ／ｃｍ２以上であった。また、板厚減少量についても、化学研磨時間の経過とともに増加し、化学研磨時間が２ｍｉｎ、５ｍｉｎで、それぞれ板厚減少率が５μｍ以上、１６μｍ以上であった。 FIG. 2 shows the change in weight loss (mg / cm 2 ) of the test material with respect to the chemical polishing time (min). As the surface of the test material was dissolved by the chemical polishing action, the amount of weight loss increased as the chemical polishing time passed. The chemical polishing time was 1 min or more, and the weight loss was 2 mg / cm 2 or more. The reduction in plate thickness also increased with the passage of the chemical polishing time, and the chemical polishing time was 2 minutes and 5 minutes, and the plate thickness reduction rate was 5 μm or more and 16 μm or more, respectively.
（硬さ試験）
鋼板Ｎｏ．３は、熱延焼鈍後の機械研磨により形成された表面の硬質層について調べるため、ナノインデンテーション（Nano Indentation）法により、試験材の断面における硬さを測定した。ナノインデンテーション法は、物質の硬さや弾性率、降伏応力などの力学物性をナノメートルスケールで測る技術である。試料台の上に置かれた試料にダイヤモンド製圧子を押し込むことにより、圧入荷重と圧入変位を測定し、得られた荷重−変位曲線から硬さなどの力学物性を算出できる。試験材を冶具に挟んで固定し、硬さを測定した。なお、測定装置は、ＭＴＳ Ｓｙｓｔｅｍｓ社製のＮａｎｏ Ｉｎｄｅｎｔｅｒ ＸＰ／ＤＣＭを用いた。
(Hardness test)
Steel plate No. No. 3 measured the hardness in the cross section of a test material by the nano indentation method (Nano Indentation method), in order to investigate about the hard layer of the surface formed of the mechanical polishing after hot rolling annealing. The nanoindentation method is a technology that measures mechanical properties such as the hardness, elastic modulus, and yield stress of a substance on the nanometer scale. By pressing a diamond indenter into a sample placed on a sample table, it is possible to measure press-in load and press-in displacement, and calculate mechanical properties such as hardness from the obtained load-displacement curve. The test material was clamped in a jig and fixed, and the hardness was measured. The measuring apparatus used was Nano Indenter XP / DCM manufactured by MTS Systems.
鋼板Ｎｏ．３の試験材を用いて、化学研磨を行う前と化学研磨を行った後において、各試験材の断面の表面近傍における硬さを測定した。図３に示すように、測定箇所は、サンプルの表層から１μｍ以内の位置Ａに３点、表層から約２μｍの位置Ｂに３点、表層から約３μｍの位置Ｃに２点、表層から約１０μｍの位置Ｄに２点、の合計１０箇所を選定した。各測定箇所は、平面方向に沿って１０μｍ程度の間隔を空けて分散するように選定した。 Steel plate No. The hardness in the vicinity of the surface of the cross section of each test material was measured using the test material No. 3 before chemical polishing and after chemical polishing. As shown in FIG. 3, the measurement points are 3 points at a position A within 1 μm from the surface layer of the sample, 3 points at a position B about 2 μm from the surface layer, 2 points at a position C about 3 μm from the surface layer, and about 10 μm from the surface layer A total of 10 points of 2 points were selected at position D of. Each measurement point was selected to be dispersed at intervals of about 10 μm along the planar direction.
測定結果を図４に示す。熱延焼鈍後に研磨ベルトなどによる機械研磨を行った試験材は、内部の硬さが３ＧＰａ程度であったものの、表面近傍では５ＧＰａ程度と硬さが上昇したことから、表面近傍に硬質層が存在した。この硬質層を有する試験材に対して化学研磨時間が１ｍｉｎ以上であると、表面から内部にかけての硬さが３ＧＰａ程度の範囲にあり、表面近傍の硬質層が除去された。 The measurement results are shown in FIG. Although the hardness of the test material that was mechanically polished with a polishing belt after hot-rolled annealing was about 3 GPa, the hardness increased to about 5 GPa near the surface, so a hard layer was present near the surface did. When the chemical polishing time is 1 min or more for the test material having this hard layer, the hardness from the surface to the inside is in the range of about 3 GPa, and the hard layer in the vicinity of the surface is removed.
（冷間圧延処理）
化学研磨された試験材を冷間圧延工程に供して、化学研磨による表面改質効果を確認した。本発明に相当する化学研磨によって表面欠陥を取り除いた鋼板Ｎｏ．１〜Ｎｏ．３の各試験材は、中間圧延、中間焼鈍・酸洗、仕上圧延等の各処理を経て、平滑な表面を有する冷延板が得られた。それに対し、鋼板Ｎｏ．１、鋼板Ｎｏ．２の試験材は、化学研磨が行われていない場合、熱焼鈍鋼板の表面欠陥に起因した、カサブタ状欠陥が残存した。鋼板Ｎｏ．３の試験材は、上記の硬質層に起因して表面に微小な開口が形成され、その後の処理によって上記開口が連続したスクラッチ状欠陥が観察された。
(Cold rolling process)
The chemically polished test material was subjected to a cold rolling process to confirm the surface modification effect by chemical polishing. Steel plate No. 1 in which surface defects have been removed by chemical polishing corresponding to the present invention. 1 to No. Each of the test materials of No. 3 was subjected to treatments such as intermediate rolling, intermediate annealing / pickling, and finish rolling to obtain a cold rolled sheet having a smooth surface. On the other hand, steel plate No. 1, steel plate No. When the chemical polishing was not performed, the test material of No. 2 had a cassette-like defect due to a surface defect of the heat annealed steel sheet. Steel plate No. In the test material of No. 3, minute openings were formed on the surface due to the above-mentioned hard layer, and scratch-like defects in which the openings were continuous were observed by the subsequent treatment.
以上の試験結果によれば、熱延焼鈍後または冷延焼鈍後のステンレス鋼板を、酸および界面活性剤を含む溶液中に浸漬し、当該鋼板の表面を２ｍｇ／ｃｍ２以上溶解させる化学研磨を施す工程を含む、本発明に係る製造方法は、平滑な表面を有するステンレス鋼板が得られることが分かった。そのため、その後の中間圧延、仕上圧延（焼鈍・酸洗を含む）などの処理に供されても、鋼板表面に欠陥の発生が抑制され、美麗な表面を備えた最終製品を得ることができた。
According to the above test results, the stainless steel sheet after hot-rolled annealing or cold-rolled annealing is immersed in a solution containing an acid and a surfactant to dissolve the surface of the steel sheet by 2 mg / cm 2 or more. It has been found that the manufacturing method according to the present invention including the applying step produces a stainless steel plate having a smooth surface. Therefore, even when subjected to subsequent processing such as intermediate rolling and finish rolling (including annealing and pickling), the generation of defects on the steel sheet surface was suppressed, and a final product with a beautiful surface could be obtained. .
Claims (4)
The method according to claim 1, wherein the chemically polished stainless steel sheet is subjected to processing including intermediate rolling or finish rolling.
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