JP6161840B1 - オーステナイト系ステンレス鋼箔 - Google Patents
オーステナイト系ステンレス鋼箔 Download PDFInfo
- Publication number
- JP6161840B1 JP6161840B1 JP2016575997A JP2016575997A JP6161840B1 JP 6161840 B1 JP6161840 B1 JP 6161840B1 JP 2016575997 A JP2016575997 A JP 2016575997A JP 2016575997 A JP2016575997 A JP 2016575997A JP 6161840 B1 JP6161840 B1 JP 6161840B1
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- JP
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- Prior art keywords
- stainless steel
- steel foil
- orientation
- less
- austenitic stainless
- 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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- 239000011888 foil Substances 0.000 title claims abstract description 144
- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 53
- 239000013078 crystal Substances 0.000 claims abstract description 106
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 72
- 239000010935 stainless steel Substances 0.000 claims abstract description 72
- 238000001953 recrystallisation Methods 0.000 claims abstract description 33
- 238000005259 measurement Methods 0.000 claims abstract description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 44
- 229910052757 nitrogen Inorganic materials 0.000 claims description 23
- 239000002344 surface layer Substances 0.000 claims description 23
- 229920005989 resin Polymers 0.000 claims description 14
- 239000011347 resin Substances 0.000 claims description 14
- 238000005096 rolling process Methods 0.000 description 58
- 238000000137 annealing Methods 0.000 description 42
- 230000009467 reduction Effects 0.000 description 18
- 238000000034 method Methods 0.000 description 16
- 238000000465 moulding Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 7
- 239000004033 plastic Substances 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000001887 electron backscatter diffraction Methods 0.000 description 5
- 238000005530 etching Methods 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000010030 laminating Methods 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000003475 lamination Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000005121 nitriding Methods 0.000 description 3
- 238000000682 scanning probe acoustic microscopy Methods 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- -1 general SUS304 Chemical compound 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000002087 whitening effect Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000003486 chemical etching Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229940068105 nitrogen 99.9 % Drugs 0.000 description 1
- 229920006284 nylon film Polymers 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
- C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
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- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/40—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
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- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/76—Adjusting the composition of the atmosphere
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- C—CHEMISTRY; METALLURGY
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C—CHEMISTRY; METALLURGY
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- C—CHEMISTRY; METALLURGY
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- C—CHEMISTRY; METALLURGY
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
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- C21D8/0268—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment between cold rolling steps
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
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- C21D8/0273—Final recrystallisation annealing
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- C—CHEMISTRY; METALLURGY
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0405—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing of ferrous alloys
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- C—CHEMISTRY; METALLURGY
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
- C21D8/0468—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment between cold rolling steps
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
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- C—CHEMISTRY; METALLURGY
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Abstract
Description
(ア)オーステナイト系ステンレス鋼において、特定の方位に配向している(集積している)結晶粒の割合を特定の範囲以下とすること、すなわち、オーステナイト系ステンレス鋼において、転位密度を減少させつつ、当該結晶粒の方位をランダムにすることにより、張出し成形に対する変形の異方性が小さくなり、成形深さを大きくできる。
(イ)転位密度を減少させつつ、結晶粒の方位をランダムにするには、圧延時に強圧下して再結晶時に核生成サイトとなる転位を多く導入し、その後アニールを行って、転位密度を減少させて再結晶させつつ、再結晶した結晶粒を微細な状態に留める必要がある。
(ウ)好ましくは、板厚方向の結晶粒の数を3個以上確保することにより、塑性変形能(たとえば、良好な張出し成形性)が確保される。また、板厚に応じて板厚方向の結晶粒数の下限を決定しても良い。
(エ)表面硬化による切れ(割れ)を抑制するために、表層の窒化を極力抑制することが重要である。
(オ)板厚方向の結晶粒の数を3個以上確保し、さらに表層の窒素濃度を1.0質量%以下とすることにより、耐電解液性も確保できる。つまり、耐電解液性を向上するには、プレス加工後のコーナー部でのステンレス鋼箔表面の肌荒れを抑制し、樹脂皮膜との密着性を保つことが重要である。
(1)板厚が5μm以上60μm以下であるオーステナイト系ステンレス鋼箔であって、
前記ステンレス鋼箔の再結晶率が90%以上100%以下であり、
前記ステンレス鋼箔は、測定視野内において、{112}<111>方位からの方位差が10°以内である結晶方位の面積率と、{110}<112>方位からの方位差が10°以内である結晶方位の面積率と、{110}<001>方位からの方位差が10°以内である結晶方位の面積率の合計が20%以下である集合組織を有し、
板厚方向に結晶粒を3個以上有し、
表層の窒素濃度が1.0質量%以下であることを特徴とするオーステナイト系ステンレス鋼箔である。
(2)前記板厚が5μm以上25μm以下であることを特徴とする(1)に記載のオーステナイト系ステンレス鋼箔である。
(3)前記オーステナイト系ステンレス鋼箔の少なくとも一方の表面に樹脂フィルムが積層されていることを特徴とする(1)又は(2)に記載のオーステナイト系ステンレス鋼箔である。
(1.オーステナイト系ステンレス鋼箔)
[ステンレス鋼の材質]
本発明に係るオーステナイト系ステンレス鋼箔は、オーステナイト系ステンレス鋼から構成されていれば、特に制限されないが、オーステナイト系ステンレス鋼は以下に示す組成範囲を有していることが好ましい。当該組成範囲は、質量%で、C:0.080%以下、Si:2.0%以下、Mn:2.0%以下、P:0.045%以下、S:0.030%以下、Ni:5.0%以上11.0%以下、Cr:15.0%以上20.0%以下、Mo:0.30%以下、N:0.05%以下、Cu:0.50%以上2.50%以下を含有し、残部がFeおよび不可避的不純物からなる。上記のオーステナイト系ステンレス鋼として、市販のオーステナイト系ステンレス鋼を用いても良い。
本発明に係るオーステナイト系ステンレス鋼箔は、板厚が5〜60μmである。当該ステンレス鋼箔を電池ケースに適用した場合の電池容量の増大効果を大きくするために、板厚は60μm以下に規定される。板厚は、好ましくは50μm以下、さらに好ましくは40μm以下、より好ましくは25μm以下である。また、板厚の下限は特に限定しないが、製造技術の限界を考慮すると板厚5μmを下限としてもよい。板厚が5μmであっても、本発明による効果は享受できる。
本発明に係るオーステナイト系ステンレス鋼箔は、良好な張出し成形性(塑性変形能)を有する必要がある。具体的には、圧延後の組織は加工を受けることにより、転位などの格子欠陥が蓄積しているため、結晶粒は微細であっても転位密度が高く、硬化している。そのため、熱処理条件を材料に応じて適正に制御して、組織を再結晶させ、低転位密度にする必要がある。すなわち、再結晶組織が転位密度を駆動力として形成されるために、再結晶粒内の転位密度を低減しつつ、再結晶組織の粗大化を抑制することで、良好な張出し成形性(塑性変形能)が確保される。
本発明に係るオーステナイト系ステンレス鋼箔は、再結晶率を上記の範囲内としつつ、さらに再結晶過程を制御することにより、特徴的な集合組織を有している。具体的には、本発明に係るオーステナイト系ステンレス鋼箔は、測定視野内において、{112}<111>方位からの方位差(ずれ)が10°以内である結晶方位の面積率と、{110}<112>方位からの方位差が10°以内である結晶方位の面積率と、{110}<001>方位からの方位差が10°以内である結晶方位の面積率との合計が20%以下である集合組織を有している。なお、上記の3つの方位において、{112}、{110}、{110}面は圧延面に平行な面を示し、<111>、<112>、<001>方向は圧延方向に平行な方向を示している。さらに、上記の3つの方位は、結晶学的に等価な方位を含む方位群として構成されている。
本発明に係るオーステナイト系ステンレス鋼箔は、板厚方向に結晶粒が3個以上存在することが好ましい。板厚方向の結晶粒数は、板厚方向の任意の断面において、結晶粒径をJIS G 0551に準拠して測定して平均結晶粒径を算出し、板厚を平均結晶粒径で割り算し、その商をもって板厚方向の結晶粒数とすることができる。なお、結晶粒が等軸粒である場合は、板厚方向に直交する面において結晶粒径を測定し、平均結晶粒径を算出してもよい。
上述したように、ステンレス鋼箔の表面を窒化した場合、特に板厚が薄くなると、窒化による表層の硬化に起因する種々の問題点が顕在化する。したがって、ステンレス鋼箔の表層は窒化していないことが望ましい。「表層が窒化していない」とは、表層の窒素濃度が1.0質量%以下であることを意味する。ここで、表層とはオージェ電子分光法による測定において、酸素濃度がピーク値の半分となる厚さであり、窒素濃度は、表層における平均の濃度である。
本発明に係るオーステナイト系ステンレス鋼箔は、通常のラミネートステンレス鋼箔と同様に、その表面に樹脂フィルムを積層(ラミネート)し、ラミネートオーステナイト系ステンレス鋼箔にしてもよい。樹脂フィルムを積層することにより、電解液中での耐食性を向上させることができ、リチウムイオン電池をはじめとする電池ケースへの適用性をいっそう高めることができる。
次に本発明に係るオーステナイト系ステンレス鋼箔の製造方法について説明する。
箔圧延において、強圧下圧延を行うことにより、ステンレス鋼中に再結晶の核生成サイトとなる転位を導入することができる。圧下率が高ければ高いほど、導入される転位は増加する。転位密度は、圧下率と、圧延後に施すアニール処理と、で合せて制御される。したがって2回以上の箔圧延を行なう場合は最終の箔圧延、つまり最終アニール直前の箔圧延を強圧下で行うとよい。
圧下率=(圧延前板厚−圧延後板厚)/(圧延前板厚)
箔圧延後のアニール(最終アニール)は、転位密度を減少させ、再結晶を進行させるための重要な役割を担う。本発明に係るオーステナイト系ステンレス鋼箔に関しては、前述したように、転位密度を減少させ、再結晶を進行させつつ、粒成長を抑制して特定の方位への集積を抑制することを目的としている。
ステンレス鋼箔を上述のアニール温度で保定する時間は、3秒以上30秒以下にする。3秒未満では、熱処理が不十分となり再結晶が十分に進まず、本発明で規定する再結晶率を得られない。一方、30秒を超えると再結晶粒が粗大化するとともに、上述した3つの方位のいずれかに配向が進み、良好な成形性を得ることができない。
アニール雰囲気は、ステンレス鋼箔の表面が窒化しないように、水素またはアルゴンなどの希ガス雰囲気にする。なお、アニール雰囲気中に窒素は全く含まれないことが望ましいが、大気中から不可避で混入する窒素はある程度許容できる。表面層の窒素濃度を1.0質量%以下にするためには、アニール雰囲気中の窒素濃度が0.1体積%以下であればよい。
複数回の箔圧延工程とする場合、中間アニールの条件については特に定めないが、950℃以上1050℃以下が望ましい。結晶粒界も再結晶の核となり、箔圧延前に多く導入されていることが望ましいので、上述の温度範囲とすることで再結晶粒の粗大化を抑制することが望ましい。
Claims (3)
- 板厚が5μm以上60μm以下であるオーステナイト系ステンレス鋼箔であって、
前記ステンレス鋼箔の再結晶率が90%以上100%以下であり、
前記ステンレス鋼箔は、測定視野内において、{112}<111>方位からの方位差が10°以内である結晶方位の面積率と、{110}<112>方位からの方位差が10°以内である結晶方位の面積率と、{110}<001>方位からの方位差が10°以内である結晶方位の面積率との合計が20%以下である集合組織を有し、
板厚方向に結晶粒を3個以上有し、
表層の窒素濃度が1.0質量%以下であることを特徴とするオーステナイト系ステンレス鋼箔。 - 前記板厚が5μm以上25μm以下であることを特徴とする請求項1に記載のオーステナイト系ステンレス鋼箔。
- 前記オーステナイト系ステンレス鋼箔の少なくとも一方の表面に樹脂フィルムが積層されていることを特徴とする請求項1又は2に記載のオーステナイト系ステンレス鋼箔。
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