JP6361606B2 - 連続溶融金属めっき方法及び連続溶融金属めっき設備 - Google Patents
連続溶融金属めっき方法及び連続溶融金属めっき設備 Download PDFInfo
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- 238000007747 plating Methods 0.000 title claims description 77
- 229910052751 metal Inorganic materials 0.000 title claims description 59
- 239000002184 metal Substances 0.000 title claims description 59
- 238000000034 method Methods 0.000 title claims description 39
- 210000004894 snout Anatomy 0.000 claims description 162
- 239000007789 gas Substances 0.000 claims description 95
- 229910000831 Steel Inorganic materials 0.000 claims description 79
- 239000010959 steel Substances 0.000 claims description 79
- 230000007547 defect Effects 0.000 claims description 78
- 230000001590 oxidative effect Effects 0.000 claims description 70
- 238000000137 annealing Methods 0.000 claims description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 7
- 229910052739 hydrogen Inorganic materials 0.000 claims description 7
- 239000001257 hydrogen Substances 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 56
- 229910052725 zinc Inorganic materials 0.000 description 55
- 239000011701 zinc Substances 0.000 description 55
- 239000002436 steel type Substances 0.000 description 11
- 238000005246 galvanizing Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- 230000008020 evaporation Effects 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 3
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005206 flow analysis Methods 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- UBAZGMLMVVQSCD-UHFFFAOYSA-N carbon dioxide;molecular oxygen Chemical compound O=O.O=C=O UBAZGMLMVVQSCD-UHFFFAOYSA-N 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
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Description
(A)溶融亜鉛の蒸発(亜鉛蒸気の発生)を抑制して、アッシュによる欠陥を抑制するには、ある一定厚み以上の酸化膜を浴面に形成する必要がある。一方で、酸化膜による欠陥を抑制するには、ある一定厚み以下に酸化膜を抑制する必要がある。つまり、アッシュによる欠陥と酸化膜による欠陥の両方を抑制するには、最適な厚みの酸化膜を形成しなければならない。
(B)このように最適な厚みの酸化膜を形成するには、スナウト内の雰囲気の対流を抑えた上で、スナウト内に酸化性ガスを供給することによって、スナウト内の溶融亜鉛浴面近傍の雰囲気の露点を、厳密に管理する必要がある。そのためには、スナウト内の雰囲気の熱対流を抑制した状態で、必要最小限の酸化性ガスをスナウト内に供給するのが最善である。このようにすれば、浴面近傍に供給された酸化性ガスを、ほぼそのまま浴面近傍に滞留させることができるからである。
(C)その結果、スナウト内の雰囲気の酸化力を安定的かつ迅速に変更できるという効果も得ることができる。そのため、操業条件を切り替える際に、スナウト内の雰囲気の酸化力を、変更後の操業条件に合わせて迅速に切り替えることができる。
(1)鋼帯を焼鈍炉で連続的に焼鈍する工程と、
溶融金属を収容し、溶融金属浴を形成しためっき槽に、焼鈍後の前記鋼帯を連続的に供給して、前記鋼帯に金属めっきを施す工程と、
を有する連続溶融金属めっき方法であって、
前記焼鈍炉の鋼帯出側に設けられ、端部が前記溶融金属浴に浸漬するように位置するスナウトが区画する空間を、前記焼鈍炉から前記溶融金属浴に向けて前記鋼帯が通過する際に、前記スナウト内に酸化性ガスを供給するとともに、前記スナウトの内壁面の温度を(めっき浴温−150℃)以上に、かつ、前記スナウト内の上部の雰囲気温度を(めっき浴温−100℃)以上にすることを特徴とする連続溶融金属めっき方法。
前記操業条件ごとに決定された目標露点に基づいて、前記酸化性ガス中の水蒸気量を決定する、上記(2)に記載の連続溶融金属めっき方法。
溶融金属を収容し、溶融金属浴を形成しためっき槽と、
前記焼鈍炉の鋼帯出側に設けられ、端部が前記溶融金属浴に浸漬するように位置し、前記焼鈍炉から前記溶融金属浴中に連続的に供給される鋼帯が通過する空間を区画するスナウトと、
前記スナウトの外壁及び前記スナウト内の上部に設けられた加熱体と、
前記スナウトに連結したガス供給機構と、
前記加熱体及び前記ガス供給機構を制御して、前記スナウト内に酸化性ガスを供給するとともに、前記スナウトの内壁面の温度を(めっき浴温−150℃)以上に、かつ、前記スナウト内の上部の雰囲気温度を(めっき浴温−100℃)以上にする制御部と、
を有することを特徴とする連続溶融金属めっき設備。
図1〜図3に記載の連続溶融亜鉛めっき設備を用いて、成分組成が質量%でC:0.001%、Si:0.01%、Mn:0.1%、P:0.003%、S:0.005%、Al:0.03%を含み、残部がFe及び不可避的不純物からなり、板厚0.6〜1.2mm、板幅900〜1250mm、引張強さ270MPaの鋼帯(以下、鋼種Aと称する。)を通板速度60〜100mpmで溶融亜鉛浴に進入させて、溶融亜鉛めっき鋼板を製造した。図2に示すように、ガス投入口を有する第5配管はスナウトの側面に設置し、ガス投入口の浴面からの高さは500mmとした。過去の操業データから、スナウト内の露点と、アッシュによる欠陥及び酸化膜による欠陥の欠陥率との関係を事前に調査した。結果を図6(A)に示す。図6(A)に基づいて、スナウト内の目標露点は-30℃と決定した。そして、スナウト内の露点を-30℃±4℃程度の範囲に制御できれば、アッシュによる欠陥と酸化膜による欠陥の両方を低いレベルに抑制できることがわかった。
以下の方法で、アッシュによる欠陥と酸化膜による欠陥それぞれの欠陥率を評価した。各欠陥の有無は目視で判定した。目視で判別できる欠陥の大きさは、100μm程度以上である。そして、長さ0.5m当たりの欠陥混入率を「欠陥率」と定義し、表1に示した。欠陥率1%は、1個/50mに相当する。
表1,2を参照して、評価結果を説明する。No.1(発明例)は、浴温、壁面温度、及び上部温度に温度差をつけない例で、露点変動もほとんどなく、その結果、アッシュによる欠陥及び酸化膜による欠陥ともにほとんど発生しなかった。No.2(発明例)は壁面温度が低い例、No.3(発明例)はスナウト上部の雰囲気温度が低い例であるが、スナウト内の雰囲気の露点を管理範囲(-30℃±4℃)に抑えることができており、各欠陥率も低い状態を保てている。しかも、No.1〜3では、ガスの投入流量をNo.5よりも十分に低くすることができた。
鋼種Aの鋼帯に替えて、成分組成が質量%でC:0.12%、Si:1.0%、Mn:1.7%、P:0.006%、S:0.006%、Al:0.03%を含み、残部がFe及び不可避的不純物からなり、板厚0.6〜1.2mm、板幅900〜1250mm、引張強さ780MPaの鋼帯(以下、鋼種Bと称する。)を用いた以外は、実施例1と同様にして、スナウト内の露点と、アッシュによる欠陥及び酸化膜による欠陥の欠陥率との関係を求めた。結果を図6(B)に示す。
浴温、壁面温度及び上部温度を表1に記載のNo.1〜5(発明例1〜3及び比較例1,2)とした際の、水蒸気を含有する窒素・水素混合ガスの露点の切り替えの早さを調査した。図7に示すように、投入露点を50分の時点で-35℃から-20℃に切り替えた。
10 焼鈍炉
12 めっき槽
12A 溶融亜鉛浴
14 スナウト
14A スナウトの端部
16,17 ヒーター
18 断熱材
20 ガス供給機構
22A,22B,22C,22D,22E 配管
24 バルブ
26 ターンダウンロール
28 シンクロール
30 サポートロール
32A,32B 露点測定孔
P 鋼帯
Claims (7)
- 鋼帯を焼鈍炉で連続的に焼鈍する工程と、
溶融金属を収容し、溶融金属浴を形成しためっき槽に、焼鈍後の前記鋼帯を連続的に供給して、前記鋼帯に金属めっきを施す工程と、
を有する連続溶融金属めっき方法であって、
前記焼鈍炉の鋼帯出側に設けられ、端部が前記溶融金属浴に浸漬するように位置するスナウトが区画する空間を、前記焼鈍炉から前記溶融金属浴に向けて前記鋼帯が通過する際に、前記スナウト内に水蒸気を含む酸化性ガスを供給するとともに、前記スナウトの内壁面の温度を(めっき浴温−150℃)以上(めっき浴温+0℃)以下に、かつ、前記スナウト内の上部の雰囲気温度を(めっき浴温−100℃)以上(めっき浴温+100℃)以下にすることを特徴とする連続溶融金属めっき方法。 - 前記酸化性ガスは、水蒸気を含む窒素ガス、又は、水蒸気を含む窒素・水素混合ガスである請求項1に記載の連続溶融金属めっき方法。
- 前記鋼帯の成分組成、前記焼鈍工程での焼鈍条件及び前記溶融金属浴の成分の少なくとも1つからなる操業条件ごとに、前記スナウト内の露点と、当該操業条件で金属めっきを施された前記鋼帯の不めっきによる欠陥量との関係を事前に調査して、当該操業条件における前記スナウト内の目標露点を決定する工程をさらに有し、
前記操業条件ごとに決定された目標露点に基づいて、前記酸化性ガス中の水蒸気量を決定する、請求項2に記載の連続溶融金属めっき方法。 - 前記操業条件が切り替わる際に、変更後の操業条件に対応する目標露点に基づいて、前記酸化性ガス中の水蒸気量を変更する、請求項3に記載の連続溶融金属めっき方法。
- 前記操業条件が、前記鋼帯の成分組成である請求項3又は4に記載の連続溶融金属めっき方法。
- 鋼帯幅方向における前記スナウトの両端部から前記酸化性ガスを供給する請求項1〜5のいずれか一項に記載の連続溶融金属めっき方法。
- 鋼帯を連続的に焼鈍する焼鈍炉と、
溶融金属を収容し、溶融金属浴を形成しためっき槽と、
前記焼鈍炉の鋼帯出側に設けられ、端部が前記溶融金属浴に浸漬するように位置し、前記焼鈍炉から前記溶融金属浴中に連続的に供給される鋼帯が通過する空間を区画するスナウトと、
前記スナウトの外壁及び前記スナウト内の上部に設けられた加熱体と、
前記スナウトに連結したガス供給機構と、
前記加熱体及び前記ガス供給機構を制御して、前記スナウト内に水蒸気を含む酸化性ガスを供給するとともに、前記スナウトの内壁面の温度を(めっき浴温−150℃)以上(めっき浴温+0℃)以下に、かつ、前記スナウト内の上部の雰囲気温度を(めっき浴温−100℃)以上(めっき浴温+100℃)以下にする制御部と、
を有することを特徴とする連続溶融金属めっき設備。
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