JP6020605B2 - 合金化溶融亜鉛めっき鋼板の製造方法 - Google Patents
合金化溶融亜鉛めっき鋼板の製造方法 Download PDFInfo
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- JP6020605B2 JP6020605B2 JP2015002543A JP2015002543A JP6020605B2 JP 6020605 B2 JP6020605 B2 JP 6020605B2 JP 2015002543 A JP2015002543 A JP 2015002543A JP 2015002543 A JP2015002543 A JP 2015002543A JP 6020605 B2 JP6020605 B2 JP 6020605B2
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- 229910000831 Steel Inorganic materials 0.000 title claims description 100
- 239000010959 steel Substances 0.000 title claims description 100
- 238000004519 manufacturing process Methods 0.000 title claims description 23
- 239000007789 gas Substances 0.000 claims description 197
- 238000002791 soaking Methods 0.000 claims description 92
- 238000010438 heat treatment Methods 0.000 claims description 58
- 238000005275 alloying Methods 0.000 claims description 40
- 238000001816 cooling Methods 0.000 claims description 39
- 238000005246 galvanizing Methods 0.000 claims description 34
- 238000000137 annealing Methods 0.000 claims description 26
- 230000003647 oxidation Effects 0.000 claims description 26
- 238000007254 oxidation reaction Methods 0.000 claims description 26
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 15
- 239000008397 galvanized steel Substances 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 11
- 230000001590 oxidative effect Effects 0.000 claims description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 3
- 230000003635 deoxygenating effect Effects 0.000 claims description 2
- 238000007747 plating Methods 0.000 description 22
- 238000000034 method Methods 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 239000012528 membrane Substances 0.000 description 12
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 8
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
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- 239000002737 fuel gas Substances 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 210000004894 snout Anatomy 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
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- 238000000354 decomposition reaction Methods 0.000 description 1
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- 238000006392 deoxygenation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
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- 239000003014 ion exchange membrane Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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Description
(1)直火型加熱炉を含む加熱帯と、均熱帯と、冷却帯とがこの順に並置された焼鈍炉と、前記冷却帯に隣接した溶融亜鉛めっき設備と、該溶融亜鉛めっき設備と隣接した合金化設備と、を有する連続溶融亜鉛めっき装置を用いた合金化溶融亜鉛めっき鋼板の製造方法であって、
鋼帯を前記焼鈍炉の内部で、前記加熱帯、前記均熱帯及び前記冷却帯の順に搬送して、前記鋼帯に対して焼鈍を行う工程と、
前記溶融亜鉛めっき設備を用いて、前記冷却帯から排出される鋼帯に溶融亜鉛めっきを施す工程と、
前記合金化設備を用いて、前記鋼帯に施された亜鉛めっきを加熱合金化する工程と、
を有し、
前記均熱帯に供給される還元性ガス又は非酸化性ガスは、加湿装置により加湿されたガスと、前記加湿装置により加湿されていないガスとを所定の混合比で混合して得た混合ガス、及び、前記加湿装置により加湿されていない乾燥ガスであり、
前記混合ガスが、前記均熱帯の高さ方向の下部1/2の領域に設けられた少なくとも1つの混合ガス供給口から前記均熱帯内に適時供給される一方で、
前記乾燥ガスが、前記均熱帯の上部ハースロール中心から、高さ方向の下部2mの範囲に設けられた少なくとも1つの乾燥ガス供給口から前記均熱帯内に適時供給されるとともに、前記上部ハースロールよりも上方に設けられた少なくとも1つのガス排出口を介して炉内ガスを前記均熱帯から適時排出することによって、前記均熱帯内の少なくとも最上部における露点を−20℃以上0℃以下に制御することを特徴とする合金化溶融亜鉛めっき鋼板の製造方法。
本実施形態において、第2加熱帯10Bは、直火型加熱炉(DFF)である。DFFは例えば特許文献1に記載されるような公知のものを用いることができる。図1においては図示しないが、第2加熱帯10Bにおける直火型加熱炉の内壁には、複数のバーナが鋼帯Pに対向して分散配置される。複数のバーナは複数のグループに分けられ、グループごとに燃料率及び空気比を独立に制御可能とすることが好ましい。第1加熱帯10Aの内部には、第2加熱帯10Bの燃焼排ガスが供給され、その熱で鋼帯Pを予熱する。
本実施形態において均熱帯12では、加熱手段としてラジアントチューブ(RT)(図示せず)を用いて、鋼帯Pを間接加熱することができる。均熱帯12の内部の平均温度Tr(℃)は、均熱帯内に熱電対を挿入することによりにより測定されるが、700〜900℃とすることが好ましい。
本実施形態において冷却帯14,16では、鋼帯Pが冷却される。鋼帯Pは、第1冷却帯14では480〜530℃程度にまで冷却され、第2冷却帯16では470〜500℃程度にまで冷却される。
溶融亜鉛めっき浴22を用いて、第2冷却帯16から排出される鋼帯Pに溶融亜鉛めっきを施すことができる。溶融亜鉛めっきは定法に従って行えばよい。
合金化設備23を用いて、鋼帯Pに施された亜鉛めっきを加熱合金化することができる。合金化処理は定法に従って行えばよい。本実施形態によれば、合金化温度が高温にならないため、製造された合金化溶融亜鉛めっき鋼板の引張強度が低下することがない。
図1及び図2に示す連続溶融亜鉛めっき装置を用いて、表1に示す成分組成の鋼帯を表2に示す各種焼鈍条件で焼鈍し、その後溶融亜鉛めっき及び合金化処理を施した。
めっき外観の評価は、光学式の表面欠陥計による検査(φ0.5以上の不めっき欠陥や過酸化性欠陥を検出)および目視による合金化ムラ判定を行い、全ての項目が合格で○、軽度の合金化ムラがある場合は△、一つでも不合格があれば×とした。また、コイル1000mあたりの合金化ムラの発生長さを測定した。結果を表2に示す。
本発明例のNo.3、6、9では、混合ガスを供給し、均熱帯の上部では、露点の高い炉内ガスを適時排出し、露点の低い乾燥ガスを適時供給したため、均熱帯の全体にわたって露点を安定して−20〜0℃に制御できた。このため、めっき外観が良好であり、引張強度も高かった。これに対し、混合ガスを供給しなかったNo.1、4、7では、めっき外観も悪化し、合金化ムラが発生し、また、合金化温度の上昇によっていずれの鋼種においても引張強度が低下した。また、混合ガスは供給したが、炉上部でのガス制御を行わなかったNo.2、5、8では、均熱帯の最上部で露点が0℃を超えたために、ピックアップ欠陥が発生し、めっき外観を満足しなかった。
10 加熱帯
10A 第1加熱帯(前段)
10B 第2加熱帯(後段、直火型加熱炉)
12 均熱帯
14 第1冷却帯(急冷帯)
16 第2冷却帯(除冷帯)
18 スナウト
20 焼鈍炉
22 溶融亜鉛めっき浴
23 合金化設備
24 ガス分配装置
26 加湿装置
28 循環恒温水槽
30 ガス混合装置
32 混合ガス用露点計
34 混合ガス用配管
36A,36B,36C 混合ガス供給口(適時供給)
38A,38B,38C 混合ガス供給口(適時供給)
39A,39B,39C,39D 乾燥ガス供給口(常時供給)
40A,40B,40C 乾燥ガス供給口(適時供給)
42A,42B ガス排出口(適時排出)
44 リファイナ
46A,46B,46C 露点測定位置
48A 上部ハースロール
48B 下部ハースロール
P 鋼帯
Claims (6)
- 直火型加熱炉を含む加熱帯と、均熱帯と、冷却帯とがこの順に並置された焼鈍炉と、前記冷却帯に隣接した溶融亜鉛めっき設備と、該溶融亜鉛めっき設備に隣接した合金化設備と、を有する連続溶融亜鉛めっき装置を用いた合金化溶融亜鉛めっき鋼板の製造方法であって、
鋼帯を前記焼鈍炉の内部で、前記加熱帯、前記均熱帯及び前記冷却帯の順に搬送して、前記鋼帯に対して焼鈍を行う工程と、
前記溶融亜鉛めっき設備を用いて、前記冷却帯から排出される鋼帯に溶融亜鉛めっきを施す工程と、
前記合金化設備を用いて、前記鋼帯に施された亜鉛めっきを加熱合金化する工程と、
を有し、
前記均熱帯に供給される還元性ガス又は非酸化性ガスは、加湿装置により加湿されたガスと、前記加湿装置により加湿されていないガスとを所定の混合比で混合して得た混合ガス、及び、前記加湿装置により加湿されていない乾燥ガスであり、
前記混合ガスが、前記均熱帯の高さ方向の下部1/2の領域に設けられた少なくとも1つの混合ガス供給口から前記均熱帯内に適時供給される一方で、
前記乾燥ガスが、前記均熱帯の上部ハースロール中心から、高さ方向の下部2mの範囲に設けられた少なくとも1つの乾燥ガス供給口から前記均熱帯内に適時供給されるとともに、前記上部ハースロールよりも上方に設けられた少なくとも1つのガス排出口を介して炉内ガスを前記均熱帯から適時排出することによって、前記均熱帯内の少なくとも最上部における露点を−20℃以上0℃以下に制御することを特徴とする合金化溶融亜鉛めっき鋼板の製造方法。 - 前記ガス排出口を介して排出された炉内ガスを、脱酸素装置及び除湿装置を有するリファイナに導入して、該炉内ガス中の酸素及び水分を除去してその露点を低下させて乾燥ガスとし、この乾燥ガスを、前記乾燥ガス供給口から前記均熱帯内に適時供給する乾燥ガスとして用いる請求項1に記載の合金化溶融亜鉛めっき鋼板の製造方法。
- 前記均熱帯の高さ方向の上部1/2の領域における露点と、最下部における露点とが、共に−20℃以上0℃以下となるように、前記混合ガスの供給を制御する請求項1又は2に記載の合金化溶融亜鉛めっき鋼板の製造方法。
- 前記ガス排出口及び/又は前記乾燥ガス供給口は、同じ高さ位置に複数配置される請求項1〜3のいずれか1項に記載の合金化溶融亜鉛めっき鋼板の製造方法。
- 前記混合ガス供給口は、2つ以上の異なる高さ位置にそれぞれ複数配置される請求項1〜4のいずれか1項に記載の合金化溶融亜鉛めっき鋼板の製造方法。
- 前記直火型加熱炉は、酸化用バーナと、該酸化用バーナより鋼板移動方向下流に位置する還元用バーナと、を有し、前記酸化用バーナの空気比を0.95以上1.5以下とし、前記還元用バーナの空気比を0.5以上0.95未満とする請求項1〜5のいずれか1項に記載の合金化溶融亜鉛めっき鋼板の製造方法。
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