JP2016017193A - 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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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims abstract description 20
- 239000008397 galvanized steel Substances 0.000 title claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 95
- 239000010959 steel Substances 0.000 claims abstract description 95
- 238000002791 soaking Methods 0.000 claims abstract description 70
- 238000010438 heat treatment Methods 0.000 claims abstract description 61
- 238000001816 cooling Methods 0.000 claims abstract description 39
- 238000005275 alloying Methods 0.000 claims abstract description 34
- 238000000137 annealing Methods 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000005246 galvanizing Methods 0.000 claims description 32
- 230000003647 oxidation Effects 0.000 claims description 26
- 238000007254 oxidation reaction Methods 0.000 claims description 26
- 238000002156 mixing Methods 0.000 claims description 11
- 230000001590 oxidative effect Effects 0.000 claims description 10
- 238000007747 plating Methods 0.000 abstract description 25
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 abstract description 3
- 239000011701 zinc Substances 0.000 abstract description 3
- 229910052725 zinc Inorganic materials 0.000 abstract description 3
- 230000003247 decreasing effect Effects 0.000 abstract description 2
- 238000001035 drying Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 165
- 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
- 238000002485 combustion reaction Methods 0.000 description 8
- 230000007423 decrease Effects 0.000 description 7
- 230000007547 defect Effects 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
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- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000007598 dipping method Methods 0.000 description 3
- 239000002737 fuel gas Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 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
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
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- 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
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
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Abstract
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、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、
前記冷却帯から排出される鋼帯に対して、前記溶融亜鉛めっき設備を用いて溶融亜鉛めっきを施す工程と、
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乾燥ガスとを所定の混合比で混合して得た混合ガスであり、
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つのガス供給口から前記混合ガスを前記均熱帯内に供給して、前記均熱帯の高さ方向の上部1/5の領域で測定される露点と、下部1/5の領域で測定される露点とを、共に−20℃以上0℃以下と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。
V:混合ガスの流量(m3/hr)
m:混合ガスの露点から算出される混合ガスの含有水分(ppm)
y:露点計又はガス供給口の高さ位置(m)
N:ガス供給口の合計数
添え字
t:混合ガスの合計
a:前記均熱帯の高さ方向の上部1/5の領域に配置される露点計
b:前記均熱帯の高さ方向の下部1/5の領域に配置される露点計
i:i番目のガス供給口
まず、本発明の一実施形態による合金化溶融亜鉛めっき鋼板の製造方法に用いる連続溶融亜鉛めっき装置100の構成を、図1を参照して説明する。連続溶融亜鉛めっき装置100は、加熱帯10、均熱帯12及び冷却帯14,16がこの順に並置された焼鈍炉20と、冷却帯16に隣接した溶融亜鉛めっき設備としての溶融亜鉛めっき浴22と、を有する。本実施形態において加熱帯10は、第1加熱帯10A(加熱帯前段)及び第2加熱帯10B(加熱帯後段)を含む。冷却帯は、第1冷却帯14(急冷帯)及び第2冷却帯16(除冷帯)を含む。第2冷却帯16と連結したスナウト18は、先端が溶融亜鉛めっき浴22に浸漬しており、焼鈍炉20と溶融亜鉛めっき浴22とが接続されている。連続溶融亜鉛めっき装置100は、亜鉛めっきを加熱合金化するための合金化設備23も有する。
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。
第2冷却帯16から排出される鋼帯Pに対して、溶融亜鉛めっき浴22を用いて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。
本発明の一実施形態は、この連続溶融亜鉛めっき装置100を用いた合金化溶融亜鉛めっき鋼板の製造方法である。焼鈍炉20内のガスは、炉の下流から上流に流れる。通常は、焼鈍炉内各位置に乾燥ガスを供給し、炉内が所定範囲の陽圧となるようにする。炉内圧力が低下すると、焼鈍炉内に外気が混入し、炉内酸素濃度や露点が上昇してしまい、鋼帯が酸化して酸化スケールが発生したり、ハースロール表面が酸化してピックアップ欠陥が発生したりするためである。一方、炉内圧力が過度に上昇すると、炉体そのものを損傷させる危険がある。このように炉内圧力制御は、安定製造のために非常に重要となる。
V:混合ガスの流量(m3/hr)
m:混合ガスの露点から算出される混合ガスの含有水分(ppm)
y:露点計又はガス供給口の高さ位置(m)
N:ガス供給口の合計数
添え字
t:混合ガスの合計
a:前記均熱帯の高さ方向の上部1/5の領域に配置される露点計
b:前記均熱帯の高さ方向の下部1/5の領域に配置される露点計
i:i番目のガス供給口
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。
表2に示すように、本発明例では、露点を安定して−10〜−20℃内に制御できたため、めっき外観が良好であり、引張強度も高かった。特に、式(1)を満足するように混合ガスを投入した場合、露点をより安定して−10〜−20℃内に制御できたため、合金ムラ発生長さをゼロにすることができた。一方、加湿ガスを含む混合ガスを供給しない比較例では、鋼板によって持ち込まれる水分では足りず、通板にともなって均熱帯内の露点が低下した。したがって、均熱帯内の露点を十分に上昇させることができず、かつ炉内露点偏差も大きくなった。その結果、合金化ムラが発生し、合金化温度が上昇してしまい、引張強度も低下した。また、加湿ガスを含む混合ガスを供給するが上段露点又は下段露点を−20℃以上0℃以下にできなかった比較例でも、めっき外観と引張強度の両立はできなかった。
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 ガス供給口
38A,38B,38C ガス供給口
40A,40B 露点測定位置
42 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、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、
前記冷却帯から排出される鋼帯に対して、前記溶融亜鉛めっき設備を用いて溶融亜鉛めっきを施す工程と、
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乾燥ガスとを所定の混合比で混合して得た混合ガスであり、
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つのガス供給口から前記混合ガスを前記均熱帯内に供給して、前記均熱帯の高さ方向の上部1/5の領域で測定される露点と、下部1/5の領域で測定される露点とを、共に−20℃以上0℃以下と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。 - 前記ガス供給口は、複数配置され、かつ、2つ以上の異なる高さ位置に少なくとも1つ配置される請求項1に記載の合金化溶融亜鉛めっき鋼板の製造方法。
- 同じ高さ位置に配置された前記ガス供給口からのガス流量の合計を、全ての高さ位置において同一として、高さ位置が低い前記ガス供給口から供給される前記混合ガスほど露点を高くする請求項2に記載の合金化溶融亜鉛めっき鋼板の製造方法。
- 全ての前記ガス供給口からから供給される前記混合ガスの露点を同一として、高さ位置が低い前記ガス供給口からのガス流量ほど多くする請求項2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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