JP6408473B2 - 金属被覆鋼ストリップの製造方法 - Google Patents
金属被覆鋼ストリップの製造方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims description 19
- 239000010959 steel Substances 0.000 title claims description 19
- 229910052751 metal Inorganic materials 0.000 title description 9
- 239000002184 metal Substances 0.000 title description 9
- 238000004519 manufacturing process Methods 0.000 title description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 86
- 239000000956 alloy Substances 0.000 claims description 86
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- 238000010791 quenching Methods 0.000 claims description 62
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 59
- 239000000498 cooling water Substances 0.000 claims description 58
- 229910007981 Si-Mg Inorganic materials 0.000 claims description 57
- 229910008316 Si—Mg Inorganic materials 0.000 claims description 57
- 239000011248 coating agent Substances 0.000 claims description 53
- 230000000171 quenching effect Effects 0.000 claims description 52
- 238000000034 method Methods 0.000 claims description 50
- 229910052749 magnesium Inorganic materials 0.000 claims description 31
- 239000012535 impurity Substances 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 14
- 229910052710 silicon Inorganic materials 0.000 claims description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- 239000002253 acid Substances 0.000 claims description 11
- 229910052725 zinc Inorganic materials 0.000 claims description 11
- 229910019064 Mg-Si Inorganic materials 0.000 claims description 4
- 229910019406 Mg—Si Inorganic materials 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 238000007598 dipping method Methods 0.000 claims description 3
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- 238000004804 winding Methods 0.000 claims description 2
- 230000003134 recirculating effect Effects 0.000 claims 1
- 239000011777 magnesium Substances 0.000 description 39
- 238000002474 experimental method Methods 0.000 description 21
- 229910018137 Al-Zn Inorganic materials 0.000 description 18
- 229910018573 Al—Zn Inorganic materials 0.000 description 18
- 239000011701 zinc Substances 0.000 description 17
- 239000002244 precipitate Substances 0.000 description 14
- 239000011575 calcium Substances 0.000 description 12
- 229910052791 calcium Inorganic materials 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 239000007921 spray Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 8
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 7
- 238000012827 research and development Methods 0.000 description 7
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 6
- 229910001092 metal group alloy Inorganic materials 0.000 description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 5
- 101001056180 Homo sapiens Induced myeloid leukemia cell differentiation protein Mcl-1 Proteins 0.000 description 5
- 102100026539 Induced myeloid leukemia cell differentiation protein Mcl-1 Human genes 0.000 description 5
- 238000004090 dissolution Methods 0.000 description 5
- 238000001465 metallisation Methods 0.000 description 5
- 239000010410 layer Substances 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 3
- -1 aluminum-zinc-silicon-magnesium Chemical compound 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical class [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 150000004679 hydroxides Chemical class 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000001095 magnesium carbonate Substances 0.000 description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 101000573526 Homo sapiens Membrane protein MLC1 Proteins 0.000 description 1
- 101000635885 Homo sapiens Myosin light chain 1/3, skeletal muscle isoform Proteins 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 102100030739 Myosin light chain 4 Human genes 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical group [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 101150035574 mcl2 gene Proteins 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/12—Aluminium or alloys based thereon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
- C23C2/29—Cooling or quenching
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12861—Group VIII or IB metal-base component
- Y10T428/12951—Fe-base component
- Y10T428/12972—Containing 0.01-1.7% carbon [i.e., steel]
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- Oil, Petroleum & Natural Gas (AREA)
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- Coating With Molten Metal (AREA)
Description
Zn: 30〜60%
Si: 0.3〜3%
Mg: 0.3〜10%
残部 Alおよび不可避不純物
Zn: 35〜50%
Si: 1.2〜2.5%
Mg: 1.0〜3.0%
残部 Alおよび不可避不純物
Zn: 30〜60%
Si: 0.3〜3%
Mg: 0.3〜10%
残部 Alおよび不可避不純物
Zn: 35〜50%
Si: 1.2〜2.5%
Mg: 1.0〜3.0%
残部 Alおよび不可避不純物
Zn: 30〜60%
Si: 0.3〜3%
Mg: 0.3〜10%
残部 Alおよび不可避不純物
図1を参照すると、使用時に、冷間圧延した低炭素鋼ストリップの(複数の)コイルは、巻き解きステーション1(uncoiling station 1)で巻き解かれ、そして次の巻き解き長さのストリップ(successive uncoiled lengths of the strip)は、溶接機2により端部が端部に溶接されて、連続した長さのストリップとなる。
グループ(a)の合金は、Al、Zn、SiおよびMgの元素を、重量%で次の範囲で含む。Al:2〜19%、Si:0.01〜2%、Mg:1〜10%、残部Znおよび不可避不純物。グループ(b)の合金は、Al、Zn、SiおよびMgの元素を、重量%で次の範囲で含む。Al:30〜60%、Si:0.3〜3%、Mg:0.3〜10%、残部Znおよび不可避不純物。
・AZ:55Al-43Zn-1.5Si-0.45Fe-付随的な不純物
・AM: 53Al-43Zn-2Mg-1.5Si-0.45Fe-付随的な不純物(グループ(b)の合金).
MLC1ラインでの工場実験の第1週目は、AZ(Al-Zn)合金で実施され、標準的なジンカリウム(Zincalume:登録商標)で被覆したストリップを製造した。ラインは、設定された操作条件(established operating conditions)で実施された。ラインでの水冷工程について、焼き入れ水は、水のスプレーの上流側で50〜60℃の温度であった。焼き入れ水のpHの制御はしなかった。これらの条件下で、焼き入れ水はアルミニウムで飽和し、pHは(60℃で)約8.5に増加した。
リン酸を使用した焼き入れ用タンクのpHの制御の実験を4日間行った。制御システムは、所定の[OH-]イオンの数である1.0×10-6mol/Lとなるように設定された。
上述したpHの制御の実験期間の終了時に、焼き入れ用タンクのスプレーの設定温度を50℃から35℃に下げ、pHの投与を中止した。焼き入れ用タンクを水で洗い流して、pH制御の実験からの残留塩類を除去した。この変更は、さらなる下流側においてストリップが濡れた状態となる原因となったが、それはさらに、焼き入れ用タンクの制御には温度が重要な変数であることも示した。低温操作の期間中(24時間)に、焼き入れ用タンクの熱交換器を横切る差圧の増加はなかった。焼き入れ用タンクの温度は、典型的にはスプレー温度よりも15℃高かった。低温実験中に、焼き入れ用タンクの温度は、通常のMCL1における典型的な焼入れ条件の65〜70℃ではなく、48〜50℃であった。
実験中に、焼き入れ水のサンプルを集めて分析した。その結果を図2および図3に示す。
出願人による上述の実験および他の研究開発活動により、Al-Zn-Si-Mg合金被覆ストリップは、Al-Zn合金被覆ストリップに比べて冷却水とはるかに反応しやすいこと、そして焼き入れ用熱交換器の急速な劣化と焼き入れ用タンク表面の被覆とをもたらすこと、その高い反応性はマグネシウムとカルシウムが主な原因であること、が実証された。焼き入れ用タンクの低い温度とpHの制御は、焼き入れ水の中のマグネシウムおよびカルシウムの溶解の影響を低減し、焼き入れ用熱交換器が実際的に動作可能になる。
Claims (31)
- 鋼ストリップ上にAl‐Zn‐Mg‐Siの被覆を形成するために、鋼ストリップ上にAl‐Zn‐Si‐Mg合金被覆を形成する方法であって、
鋼ストリップを溶融Al‐Zn‐Si‐Mg合金浴に浸漬して、前記鋼ストリップの露出面に前記合金の被覆を形成する工程と、
被覆ストリップを冷却水で冷却する工程であって、冷却水に酸を添加することにより冷却水のpHをpH5〜9の範囲に制御することを含む、冷却する工程と、
を含み、
前記冷却する工程は閉ループを含み、当該閉ループでは、前記被覆ストリップに水を供給し、水を回収して冷却し、そしてその冷却した水を前記被覆ストリップの冷却のために戻す、という回路を通して水が循環する、方法。 - 前記冷却する工程は、冷却水の前記pHを8未満に制御することを含む、請求項1に記載の方法。
- 前記冷却する工程は、冷却水の前記pHを7未満に制御することを含む、請求項1または2に記載の方法。
- 前記冷却する工程は、冷却水の前記pHを、6を超えるように制御することを含む、請求項1〜3のいずれか1項に記載の方法。
- 前記冷却する工程は、冷却水の温度を25〜80℃の範囲に制御することを含む、請求項1〜4のいずれか1項に記載の方法。
- 前記冷却する工程は、冷却水の温度を70℃未満に制御することを含む、請求項1〜5のいずれか1項に記載の方法。
- 前記冷却する工程は、冷却水の温度を60℃未満に制御することを含む、請求項1〜6のいずれか1項に記載の方法。
- 前記冷却する工程は、冷却水の温度を55℃未満に制御することを含む、請求項1〜7のいずれか1項に記載の方法。
- 前記冷却する工程は、冷却水の温度を50℃未満に制御することを含む、請求項1〜8のいずれか1項に記載の方法。
- 前記冷却する工程は、冷却水の温度を45℃未満に制御することを含む、請求項1〜9のいずれか1項に記載の方法。
- 前記冷却する工程は、冷却水の温度を、30℃を超えるように制御することを含む、請求項1〜10のいずれか1項に記載の方法。
- 前記冷却する工程は、冷却水の温度を、40℃を超えるように制御することを含む、請求項1〜11のいずれか1項に記載の方法。
- 前記ストリップを冷却する工程は、前記冷却水の化学成分を制御することを含む、請求項1〜12のいずれか1項に記載の方法。
- 前記ストリップを冷却する工程は、前記冷却水に酸を添加することにより、化学成分および前記pHを制御することを含む、請求項1〜13のいずれか1項に記載の方法。
- 前記冷却する工程は水焼き入れ工程を含む、請求項1〜14のいずれか1項に記載の方法。
- 前記回路は冷却塔を含み、前記冷却する工程は、冷却水を冷却塔から前記被覆ストリップに供給すること、回収すること、そして前記冷却塔を通して冷却水を再循環することを含む、請求項1〜15のいずれか1項に記載の方法。
- 前記冷却する工程は、前記被覆ストリップを30〜55℃の温度範囲に冷却するように、操作条件を制御することを含む、請求項1〜16のいずれか1項に記載の方法。
- 溶融めっき工程の前に、前記ストリップを清浄にするためにストリップを前処理する工程を含んでいる、請求項1〜17のいずれか1項に記載の方法。
- 前記被覆ストリップを圧延する工程を含んでいる、請求項1〜18のいずれか1項に記載の方法。
- 前記被覆ストリップを不動態化溶液で処理する工程を含んでいる、請求項1〜19のいずれか1項に記載の方法。
- 前記被覆ストリップを巻き取る工程を含んでいる、請求項1〜20のいずれか1項に記載の方法。
- 前記Al‐Zn‐Si‐Mg合金は、0.3重量%を超えるMgを含む、請求項1〜21のいずれか1項に記載の方法。
- 前記Al‐Zn‐Si‐Mg合金は1.0重量%を超えるMgを含む、請求項1〜22のいずれか1項に記載の方法。
- 前記Al‐Zn‐Si‐Mg合金は1.3重量%を超えるMgを含む、請求項1〜23のいずれか1項に記載の方法。
- 前記Al‐Zn‐Si‐Mg合金は1.5重量%を超えるMgを含む、請求項1〜24のいずれか1項に記載の方法。
- 前記Al‐Zn‐Si‐Mg合金は3重量%未満のMgを含む、請求項1〜25のいずれか1項に記載の方法。
- 前記Al‐Zn‐Si‐Mg合金は2.5重量%を超えるMgを含む、請求項1〜26のいずれか1項に記載の方法。
- 前記Al‐Zn‐Si‐Mg合金は1.2重量%を超えるSiを含む、請求項1〜27のいずれか1項に記載の方法。
- 前記Al‐Zn‐Si‐Mg合金は2.5重量%未満のSiを含む、請求項1〜28のいずれか1項に記載の方法。
- 前記Al‐Zn‐Si‐Mg合金は、Al、Zn、SiおよびMgの元素を、重量%で以下の範囲で含む、請求項1〜29のいずれか1項に記載の方法。
Zn: 30〜60%
Si: 0.3〜3%
Mg: 0.3〜10%
残部 Alおよび不可避不純物 - 前記Al‐Zn‐Si‐Mg合金は、Al、Zn、SiおよびMgの元素を、重量%で以下の範囲で含む、請求項1〜30のいずれか1項に記載の方法。
Zn: 35〜50%
Si: 1.2〜2.5%
Mg: 1.0〜3.0%
残部 Alおよび不可避不純物
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