JP2023504496A - 曲げ加工性及び耐食性に優れた溶融亜鉛めっき鋼板及びその製造方法 - Google Patents
曲げ加工性及び耐食性に優れた溶融亜鉛めっき鋼板及びその製造方法 Download PDFInfo
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- JP2023504496A JP2023504496A JP2022532730A JP2022532730A JP2023504496A JP 2023504496 A JP2023504496 A JP 2023504496A JP 2022532730 A JP2022532730 A JP 2022532730A JP 2022532730 A JP2022532730 A JP 2022532730A JP 2023504496 A JP2023504496 A JP 2023504496A
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- steel sheet
- hot
- dip galvanized
- corrosion resistance
- mgzn2
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- Pending
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- 238000005452 bending Methods 0.000 title claims abstract description 66
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims abstract description 44
- 239000008397 galvanized steel Substances 0.000 title claims abstract description 44
- 230000007797 corrosion Effects 0.000 title claims abstract description 43
- 238000005260 corrosion Methods 0.000 title claims abstract description 43
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 84
- 239000010959 steel Substances 0.000 claims abstract description 84
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 42
- 239000000956 alloy Substances 0.000 claims abstract description 42
- 229910017708 MgZn2 Inorganic materials 0.000 claims abstract description 27
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 23
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- 239000012535 impurity Substances 0.000 claims abstract description 13
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- 238000001816 cooling Methods 0.000 claims description 14
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- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
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- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 3
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- 150000003839 salts Chemical class 0.000 description 3
- 229910018134 Al-Mg Inorganic materials 0.000 description 2
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
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- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
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- 238000007711 solidification Methods 0.000 description 2
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- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910019018 Mg 2 Si Inorganic materials 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000003287 bathing Methods 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
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- 230000000087 stabilizing effect Effects 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
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Abstract
Description
素地鋼板;
上記素地鋼板の少なくとも一面に備えられ、素地鋼板から拡散した鉄(Fe)を除いた残りの成分について、重量%で、Al:5.1~25%、Mg:4.0~10%、残りZn及びその他の不可避不純物を含むZn-Mg-Al系のめっき層;及び
上記素地鋼板と上記めっき層との間に形成されたFe-Al-Zn組成の界面合金層を含み、
上記界面合金層は、その厚さが0.5~2μmであり、樹枝状形態を有し、及び
上記Zn-Mg-Al系のめっき層は、Zn-Al-MgZn2の3元系共晶組織、Zn-MgZn2の2元系共晶組織、Znが固溶されたAl単相組織及びZn単相組織のうち一つ以上を含む組織を有し、MgZn2組織内に凝集したAlが含まれていることを特徴とする曲げ加工性及び耐食性に優れた溶融亜鉛めっき鋼板に関するものである。
素地鋼板を用意する段階;
上記素地鋼板を、重量%で、Al:5.1~25%、Mg:4.0~10%、残りZn及びその他の不可避不純物を含むめっき浴に溶融亜鉛めっきする段階;及び
上記めっき浴の湯面から冷却を開始してトップロール(Top roll)区間まで5~30℃/sの冷却速度で不活性ガスを用いてめっき鋼板を冷却することで、上記素地鋼板上に界面合金層及びZn-Mg-Al系のめっき層が順次形成された溶融亜鉛めっき鋼板を製造する段階;を含み、
上記素地鋼板は、下記関係式1によって定義される上記界面合金層の厚さ(H)が0.5~2μmの範囲を満たすことができるようにする温度(T)を有するめっき浴に浸漬させてめっきすることを特徴とする曲げ加工性及び耐食性に優れた溶融亜鉛めっき鋼板の製造方法に関するものである。
[関係式1]
H(μm)=170.53+0.0008T2-0.7376T
めっき層内のMgは、めっき鋼材の耐食性を向上させる役割を果たす元素として、腐食生成物を均一に生成し、これによって形成された腐食生成物はこれ以上の腐食を進行させないため、結果的に耐食性を向上させる。
[関係式1]
H(μm)=170.53+0.0008T2-0.7376T
まず、素地鋼板として、C:0.018%、Mn:0.2%、Si:0.001%、P:0.009%、Al:0.022%を含み、残部がFe及び不可避不純物からなる冷延鋼板を用意した。この後、上記冷延鋼板の片面のめっき付着量が140g/m2となるように溶融亜鉛めっきを行った後、湯面からTop-rollまで15℃/sの速度で冷却して、Zn-Mg-Al系合金めっき鋼板を得た。
各めっき鋼板を塩水噴霧試験機に装入し、国際規格(ASTM B117-11)によって適正発生時間を測定した。このとき、5%塩水(温度35℃、pH6.8)を用い、時間当たり2ml/80cm2の塩水を噴霧した。そして、めっき付着量の差による影響を排除するために、赤錆が発生するまで経過した時間(hr)をめっき付着量(g/m2)で割って耐食性の指数で表して評価した。
○:50超過である場合
△:10~50である場合
×:10未満である場合
同一素材厚さ(1.2t)及び同一めっき付着量(275~285g/m2)で90度曲げ(曲げ径:3R)、3T曲げ、1T曲げ、OT曲げ加工後、曲げ加工頂部の長さ1mmをSEMで観察した後、曲げクラックの幅を観察してから平均化して評価した。
◎:曲げクラックの幅30μm以下
○:曲げクラックの幅30μm超過60μm以下
△:曲げクラックの幅60μm超過100μm以下
×:曲げクラックの幅100μm超過
Claims (7)
- 素地鋼板;
前記素地鋼板の少なくとも一面に備えられ、素地鋼板から拡散した鉄(Fe)を除いた残りの成分について、重量%で、Al:5.1~25%、Mg:4.0~10%、残りZn及びその他の不可避不純物を含むZn-Mg-Al系のめっき層;及び
前記素地鋼板と前記めっき層との間に形成されたFe-Al-Zn組成の界面合金層を含み、
前記界面合金層は、その厚さが0.5~2μmであり、樹枝状の形態を有し、及び
前記Zn-Mg-Al系のめっき層は、Zn-Al-MgZn2の3元系共晶組織、Zn-MgZn2の2元系共晶組織、Znが固溶されたAl単相組織及びZn単相組織のうち一つ以上を含む組織を有し、MgZn2組織内に凝集したAlが含まれている、曲げ加工性及び耐食性に優れた溶融亜鉛めっき鋼板。 - 前記Al及びMg含有量は、Mg-Al-Znの3元系状態図のMgZn2及びAlの2共晶ラインに位置するように決定される、請求項1に記載の曲げ加工性及び耐食性に優れた溶融亜鉛めっき鋼板。
- 前記素地鋼板を含むめっき層の90度曲げ及びOT曲げ加工時に生成される曲げクラックの幅は、それぞれ30μm以下及び100μm以下である、請求項1に記載の曲げ加工性及び耐食性に優れた溶融亜鉛めっき鋼板。
- 素地鋼板を用意する段階;
前記素地鋼板を、重量%で、Al:5.1~25%、Mg:4.0~10%、残りZn及びその他の不可避不純物を含むめっき浴に溶融亜鉛めっき段階;及び
前記めっき浴の湯面から冷却を開始して、トップロール(Top roll)区間まで5~30℃/sの冷却速度で不活性ガスを用いてめっき鋼板を冷却することで、前記素地鋼板上に界面合金層とZn-Mg-Al系のめっき層が順次形成された溶融亜鉛めっき鋼板を製造する段階;を含み、
前記素地鋼板を、下記関係式1によって定義される前記界面合金層の厚さ(H)が0.5~2μmの範囲を満たすことができるようにする温度(T)を有するめっき浴に浸漬させてめっきする、曲げ加工性及び耐食性に優れた溶融亜鉛めっき鋼板の製造方法。
[関係式1]
H(μm)=170.53+0.0008T2-0.7376T - 前記Zn-Mg-Al系のめっき層は、Zn-Al-MgZn2の3元系共晶組織、Zn-MgZn2の2元系共晶組織、Znが固溶されたAl単相組織及びZn単相組織のうち一つ以上を含む組織を有し、MgZn2組織内に凝集したAlが含まれている、請求項4に記載の曲げ加工性及び耐食性に優れた溶融亜鉛めっき鋼板の製造方法。
- 前記めっき浴の温度を470~520℃の範囲に維持する、請求項4に記載の曲げ加工性及び耐食性に優れた溶融亜鉛めっき鋼板の製造方法。
- 前記めっき浴中のAl及びMg含有量は、Mg-Al-Znの3元系状態図のMgZn2及びAlの2共晶ラインに位置するように決定される、請求項4に記載の曲げ加工性及び耐食性に優れた溶融亜鉛めっき鋼板の製造方法。
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- 2020-12-01 WO PCT/KR2020/017344 patent/WO2021112519A1/ko unknown
- 2020-12-01 US US17/782,401 patent/US20230019786A1/en active Pending
- 2020-12-01 EP EP20897267.9A patent/EP4071265A4/en active Pending
- 2020-12-01 JP JP2022532730A patent/JP2023504496A/ja active Pending
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WO2021112519A1 (ko) | 2021-06-10 |
US20230019786A1 (en) | 2023-01-19 |
EP4071265A4 (en) | 2022-11-23 |
KR20210071631A (ko) | 2021-06-16 |
CN114787411A (zh) | 2022-07-22 |
KR102297298B1 (ko) | 2021-09-03 |
EP4071265A1 (en) | 2022-10-12 |
CN114787411B (zh) | 2023-12-12 |
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