JP2018135591A - 黒色フェライト系ステンレス鋼板 - Google Patents
黒色フェライト系ステンレス鋼板 Download PDFInfo
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- JP2018135591A JP2018135591A JP2017032727A JP2017032727A JP2018135591A JP 2018135591 A JP2018135591 A JP 2018135591A JP 2017032727 A JP2017032727 A JP 2017032727A JP 2017032727 A JP2017032727 A JP 2017032727A JP 2018135591 A JP2018135591 A JP 2018135591A
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- stainless steel
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- steel sheet
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 66
- 230000007797 corrosion Effects 0.000 claims abstract description 51
- 238000005260 corrosion Methods 0.000 claims abstract description 51
- 239000010935 stainless steel Substances 0.000 claims abstract description 48
- 238000003466 welding Methods 0.000 claims abstract description 23
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 6
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 4
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 3
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 229910052720 vanadium Inorganic materials 0.000 claims description 3
- 229910052726 zirconium Inorganic materials 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 18
- 238000012360 testing method Methods 0.000 description 34
- 235000019646 color tone Nutrition 0.000 description 19
- 230000003647 oxidation Effects 0.000 description 15
- 238000007254 oxidation reaction Methods 0.000 description 15
- 238000000034 method Methods 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 12
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- 238000011156 evaluation Methods 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 7
- 238000000576 coating method Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 238000005498 polishing Methods 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 238000000137 annealing Methods 0.000 description 4
- 238000005097 cold rolling Methods 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000004040 coloring Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- RYZCLUQMCYZBJQ-UHFFFAOYSA-H lead(2+);dicarbonate;dihydroxide Chemical compound [OH-].[OH-].[Pb+2].[Pb+2].[Pb+2].[O-]C([O-])=O.[O-]C([O-])=O RYZCLUQMCYZBJQ-UHFFFAOYSA-H 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 206010070834 Sensitisation Diseases 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000008313 sensitization Effects 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000012085 test solution Substances 0.000 description 1
Classifications
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- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/0026—Arc welding or cutting specially adapted for particular articles or work
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/78—Combined heat-treatments not provided for above
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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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
- 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
- C21D8/0463—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 following hot rolling
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- 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
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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
- 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
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C23C8/10—Oxidising
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- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
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- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/10—Oxidising
- C23C8/12—Oxidising using elemental oxygen or ozone
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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Abstract
Description
本発明に係る黒色ステンレス鋼板は、素地のステンレス鋼が上述の成分組成を有することに加えて、素地の上に酸化皮膜が形成された表面外観をCIELAB(L*a*b*表色系)により規定した。試験材の表面において、明るさを示す明度指数L*、色調を示すクロマネチックス指数a*、b*、黒色度E=(L*2+a*2+b*2)1/2を特定の範囲とした。これらの数値は、JIS Z 8722に準拠する色調測定で得られる。鋼板の平板部と、溶接部から5mm離れた溶接熱影響部において、任意の5点で測定し、平均した数値を得た。本発明に係る黒色ステンレス鋼板は、その表面が、L*≦45、−5≦a*≦5、−5≦b*≦5かつE=(L*2+a*2+b*2)1/2≦45の範囲を有している。なお、上記の黒色度Eは、一般的には、色差と称される指標であり、本明細書では「黒色度」ということにする。
本明細書では、平板部の黒色度(E1)と、溶接熱影響部の黒色度(E2)との差を黒色度差ΔEということにする。黒色ステンレス鋼板において、E1は、E2より大きな数値になるのが一般的であるが、逆の関係を示したとしても、「E1−E2」の絶対値により、黒色度差ΔEを評価すればよい。本発明に係る黒色ステンレス鋼板は、溶接後の黒色度差ΔEが10以下である特性を備えているため、平板部に対する溶接熱影響部の黒色度の差が小さく、溶接後においても優れた意匠性を確保できる。黒色度差ΔEは、5以下であると、さらに好ましい。
孔食電位(V’c)は、孔食が発生するか否かの目安となるものであり、孔食電位が使用環境の電位(自然電位)よりも高いと、孔食の発生が抑制される。本明細書では、平板部の孔食電位V’c1と溶接熱影響部の孔食電位V’c2との差を孔食電位差ΔV’cということにする。黒色ステンレス鋼板において、V’c1は、V’c2よりも大きな数値になるのが一般的であるが、逆の関係を示したとしても、「V’c1−V’c2」の絶対値により、孔食電位差ΔV’cを評価すればよい。本発明に係る黒色ステンレス鋼板は、溶接後の孔食電位差ΔV’cが100mV以下である特性を備えているため、平板部と比べて、溶接熱影響部における耐食性の低下が小さく、溶接後においても優れた耐食性を維持できる。孔食電位差ΔV’cは、50mV以下であると、さらに好ましい。
試験材(A)により、平板部黒色度を評価した。試験材(A)表面における任意の5点に対して、測定径3mmφ程度の分光測色計によるCIELAB(L*a*b*表色系)を用いて、明度指数L*、クロマネチックス指数a*、b*を測定し、平均値を得た。L*、a*、b*がL*≦45、−5≦a*≦5、−5≦b*≦5をともに満たすときを合格とした。さらに、L*、a*、b*に基づいて、平板部の黒色度E1=(L*2+a*2+b*2)1/2を算出し、E1≦45を満たすとき、合格とした。また、黒色の色調の程度を目視で評価した。色調において不均一な部分が観察されなかったものを合格(○)、不均一な部分が観察されたものを不合格(×)と評価した。
溶接を施した試験材(B)により、溶接部黒色度を評価した。試験材(B)において、溶接部から5mm離れた溶接熱影響部の任意の5点に対して、分光測色計による測定を行い、溶接熱影響部の黒色度E2を得た。前述の測定で得られた平板部の黒色度E1との黒色度差ΔEを算出した。黒色度差ΔEが、5以下であるときを良好(◎)、5超から10以下であるときを合格(○)、10を超えるときを不合格(×)と評価した。
試験材(B)を切削加工して、20mm×15mmの寸法の耐食性試験片を作製した。平板部の耐食性試験片は、試験材(B)の溶接部より50mm離れた箇所から切り出された。溶接熱影響部の耐食性試験片は、当該溶接部が試験片の中央になるように切り出された。試験片の一端に導線をスポット溶接して接続し、試験面10mm×10mm以外をシリコーン樹脂により被覆した。溶接熱影響部の耐食性試験片は、溶接部が露出試験面の中央になるように被覆した。試験液として、3.5%のNaCl水溶液を使用し、30℃でAr脱気において試験を行った。上記のNaCl水溶液中に試験面を完全に浸し、10分間の放置をした後、ポテンショスタットを用いた動電位法により、電位掃引速度20mV/minで、自然電極電位からアノード電流密度が500μA/cm2に達するまで電位を測定し、アノード分極曲線を得た。孔食電位は、アノード分極曲線において100μA/cm2に対応する電位のうち、最も貴な値とした。
試験材(B)の溶接部が中央になるように50mm×50mmの寸法で切り出して、試験片を作製した。圧縮試験機を用いて、試験片の溶接部に垂直にR=2mmで角度90°に曲げて、溶接部における酸化皮膜の剥離の有無を目視で確認した。剥離が無かったものを合格(○)、剥離が生じたものを不合格(×)と評価した。
上記の皮膜密着性の評価と同様の試験片を用い、圧縮試験機を用いて、試験片の溶接部に平行にR=2mmで角度90°に曲げて、溶接部における割れの有無を目視で確認した。溶接部に割れが無かったものを合格(○)、割れが生じたものを不合格(×)と評価した。
Claims (5)
- 質量%で、C:0.020%以下、Si:1.0%以下、Mn:0.35%以下、P:0.04%以下、S:0.005%以下、Cr:11〜25%、Mo:1.0%以下、N:0.020%以下、Al:0.4%以下、Ti:10(C+N)〜0.3%、Nb:0.05%以下、O:0.01%以下を含有し、残部Feおよび不可避的不純物からなるステンレス鋼を素地とし、前記素地の上に酸化皮膜が形成された表面を有しており、
前記表面は、明度指数(L*)がL*≦45、クロマネチックス指数(a*、b*)が、−5≦a*≦5、−5≦b*≦5、黒色度(E)がE=(L*2+a*2+b*2)1/2≦45の範囲にある、溶接性に優れる黒色フェライト系ステンレス鋼板。 - 前記ステンレス鋼が、さらに、質量%で、Ni:1.0%以下、Cu:1.0%以下、V:1.0%以下、B:0.01%以下から選ばれる一種又は二種以上を含有する、請求項1に記載の溶接性に優れる黒色フェライト系ステンレス鋼板。
- 前記ステンレス鋼が、さらに、質量%で、Ca:0.01%以下、REM:0.01%以下、Zr:0.1%以下から選ばれる一種又は二種以上を含有する、請求項1または2に記載の溶接性に優れる黒色フェライト系ステンレス鋼板。
- 平板部の黒色度と溶接熱影響部の黒色度との黒色度差が10以下であり、かつ、平板部と溶接熱影響部との孔食電位差が100mV以下である、請求項1〜3のいずれかに記載の溶接性に優れる黒色フェライト系ステンレス鋼板。
- 請求項1〜4のいずれかに記載された黒色フェライト系ステンレス鋼を含む溶接構造体。
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ES18757274T ES2937842T3 (es) | 2017-02-23 | 2018-01-26 | Lámina de acero inoxidable basado en ferrita negra |
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US16/486,956 US11326236B2 (en) | 2017-02-23 | 2018-01-26 | Black ferrite-based stainless steel sheet |
PCT/JP2018/002452 WO2018155075A1 (ja) | 2017-02-23 | 2018-01-26 | 黒色フェライト系ステンレス鋼板 |
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EP3578677A4 (en) | 2020-03-04 |
CN110312815A (zh) | 2019-10-08 |
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US20200232075A1 (en) | 2020-07-23 |
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US11326236B2 (en) | 2022-05-10 |
TWI653346B (zh) | 2019-03-11 |
WO2018155075A1 (ja) | 2018-08-30 |
TW201831707A (zh) | 2018-09-01 |
CN110312815B (zh) | 2021-05-25 |
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