JP6839283B2 - 耐食性及び加工性に優れた溶融アルミニウム系めっき鋼材及びその製造方法 - Google Patents
耐食性及び加工性に優れた溶融アルミニウム系めっき鋼材及びその製造方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims description 67
- 239000010959 steel Substances 0.000 title claims description 67
- 229910052782 aluminium Inorganic materials 0.000 title claims description 43
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 35
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 230000007797 corrosion Effects 0.000 title description 25
- 238000005260 corrosion Methods 0.000 title description 25
- 239000010410 layer Substances 0.000 claims description 113
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 107
- 238000007747 plating Methods 0.000 claims description 84
- 229910052742 iron Inorganic materials 0.000 claims description 49
- 229910045601 alloy Inorganic materials 0.000 claims description 47
- 239000000956 alloy Substances 0.000 claims description 47
- 238000010438 heat treatment Methods 0.000 claims description 38
- 229910018125 Al-Si Inorganic materials 0.000 claims description 33
- 229910018520 Al—Si Inorganic materials 0.000 claims description 33
- 239000000463 material Substances 0.000 claims description 32
- 238000000034 method Methods 0.000 claims description 29
- 238000005275 alloying Methods 0.000 claims description 22
- 229910052710 silicon Inorganic materials 0.000 claims description 11
- 229910015372 FeAl Inorganic materials 0.000 claims description 8
- 229910000838 Al alloy Inorganic materials 0.000 claims description 7
- 238000005246 galvanizing Methods 0.000 claims description 7
- 239000002344 surface layer Substances 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 6
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- 229910000905 alloy phase Inorganic materials 0.000 description 15
- 239000000203 mixture Substances 0.000 description 10
- 239000006104 solid solution Substances 0.000 description 9
- 229910052790 beryllium Inorganic materials 0.000 description 7
- 229910052712 strontium Inorganic materials 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 238000000465 moulding Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000013078 crystal Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229910052748 manganese Inorganic materials 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 239000011701 zinc Substances 0.000 description 5
- 238000002149 energy-dispersive X-ray emission spectroscopy Methods 0.000 description 4
- 229910000765 intermetallic Inorganic materials 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 229910002058 ternary alloy Inorganic materials 0.000 description 4
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 238000007792 addition Methods 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000005536 corrosion prevention Methods 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910021364 Al-Si alloy Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 101000993059 Homo sapiens Hereditary hemochromatosis protein Proteins 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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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
- C23C2/04—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
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- B32B15/00—Layered products comprising a layer of metal
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- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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Description
Al濃化層内のAl濃度を十分に確保するためには、溶融Al−Si系めっき浴に引き込む前に素地鉄の表面温度を一定温度以上に昇温させた後、溶融Al−Si系めっき浴に投入する必要があり、より具体的には、素地鉄の引き込み温度をTB+40℃〜TB+100℃に制御する必要がある。ここで、TBは溶融Al−Si系めっき浴の温度を意味する。もし、素地鉄の引き込み温度がTB+40℃未満であると、Alの不十分な拡散によって、Al濃化層内のAl濃度が不十分となり、一方、TB+100℃を超えると、Alの過剰な拡散によってAl濃化層内のAl濃度が過剰となり、脆性が高いFe−Al系金属間化合物が過剰に生成されて成形時の加工性が劣化する恐れがある。
Al濃化層を簡単に形成するためには、めっき付着量を制御した後すぐに合金化熱処理を行うことが好ましい。ここで、すぐに行うとは、めっき付着量が制御された溶融Al−Si系めっき鋼材の表面温度が溶融Al−Si系めっき層の融点に達する前に合金化熱処理を行うことを意味し得る。もし、溶融Al−Si系めっき鋼材の表面温度が溶融Al−Si系めっき層の融点以下の温度に達した後に合金化熱処理を行うと、合金化熱処理を行っても溶融Al−Si系めっき層内のAlが素地鉄に簡単に拡散できないため、目的とするAl濃化層の形成が難しくなる。
合金化熱処理のための熱処理方法には様々な方法があるが、Al濃化層を簡単に形成するためには、誘導加熱方式によって合金化熱処理を行うことがより好ましい。他の方法とは異なり、誘導加熱方式によって熱処理を行う場合、熱処理過程において溶融Al−Si系めっき層の表面に比べて素地鉄と溶融Al−Si系めっき層の界面の温度が高いため、溶融Al−Si系めっき層内のAlが素地鉄に簡単に拡散することができる。
合金化熱処理の際に加熱温度は700〜900℃、加熱温度での維持時間は2〜60secに制御することが好ましい。これは、目的とする二層構造の界面合金層を得るためである。もし、加熱温度が700℃未満であるか、または維持時間が2sec未満であると、二層構造の界面合金層の形成が難しくなり、一方、加熱温度が900℃を超えるか、または維持時間が60secを超えると、過剰な合金化が起こって成形時の加工性が劣化する恐れがある。
重量比で、Cは0.15%、Siは1.0%、Mnは2.3%、Alは0.037%、Tiは0.5%、Nは10ppm、Pは5ppm、Sは13ppmの組成でスラブを製造した。それを活用して1200℃の温度で1時間維持した後、900℃で仕上げ圧延して650℃まで冷却し、650℃に維持された保温炉で1時間維持した後に炉冷を行った。
Claims (14)
- 素地鉄と溶融Al−Si系めっき層を含む溶融アルミニウム系めっき鋼材において、前記素地鉄の表層には、Alが2重量%〜20重量%固溶したAl濃化層が備えられ、前記素地鉄と溶融Al−Si系めっき層の界面には、硬度が異なる二層構造の界面合金層が備えられ、前記Al濃化層の平均厚さは0.5〜2μmである、溶融アルミニウム系めっき鋼材。
- 前記素地鉄の平均Al含有量に対する前記Al濃化層の平均Al含有量の比は2以上である、請求項1に記載の溶融アルミニウム系めっき鋼材。
- 前記二層構造の界面合金層は、
前記素地鉄上に形成された下部合金層と、前記下部合金層上に形成され、前記下部合金層に比べて硬度が低い上部合金層とを含む、請求項1に記載の溶融アルミニウム系めっき鋼材。 - 前記下部合金層は、FeAl2、FeAl3及びFe2Al5のうち1種以上のFe−Al系合金からなり、硬度が800Hv以上である、請求項3に記載の溶融アルミニウム系めっき鋼材。
- 前記下部合金層は、45〜60重量%のFeを含む、請求項4に記載の溶融アルミニウム系めっき鋼材。
- 前記下部合金層の占有面積率は2%以上である、請求項3に記載の溶融アルミニウム系めっき鋼材。
- 前記上部合金層は、Fe−Al−Si系合金からなり、硬度が350Hv以上である、請求項3に記載の溶融アルミニウム系めっき鋼材。
- 前記上部合金層は、40〜65重量%のFe及び5〜20重量%のSiを含む、請求項7に記載の溶融アルミニウム系めっき鋼材。
- 前記溶融Al−Si系めっき層は、2〜13重量%のSiを含む、請求項1に記載の溶融アルミニウム系めっき鋼材。
- 前記溶融Al−Si系めっき層は、0.5重量%以下のBe及び0.5重量%以下のSrのうち1種以上をさらに含む、請求項9に記載の溶融アルミニウム系めっき鋼材。
- 重量%で、Si:2〜13%及び残部はAlと不可避不純物からなる溶融めっき浴に、引き込み温度がTB+40℃〜TB+100℃となるように素地鉄を浸漬してめっきする段階と、
エアナイフによって前記素地鉄表面のめっき付着量を制御する段階と、
前記めっき付着量が制御された素地鉄を合金化熱処理する段階と、
を含み、前記合金化熱処理の際の加熱温度は700〜900℃であり、前記加熱温度での維持時間は2〜60secである、
溶融アルミニウム系めっき鋼材の製造方法。 - 前記合金化熱処理は、誘導加熱方式によって行われる、請求項11に記載の溶融アルミニウム系めっき鋼材の製造方法。
- 前記加熱温度までの昇温速度は10〜350℃/secである、請求項11または12に記載のアルミニウム系めっき鋼材の製造方法。
- 前記溶融めっき浴は、Be:0.5重量%以下及びSr:0.5重量%以下のうち1種以上をさらに含む、請求項11〜13のいずれか一項に記載のアルミニウムめっき鋼材の製造方法。
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KR1020160177354A KR101858863B1 (ko) | 2016-12-23 | 2016-12-23 | 내식성 및 가공성이 우수한 용융 알루미늄계 도금강재 |
KR10-2016-0177354 | 2016-12-23 | ||
PCT/KR2017/015414 WO2018117769A1 (ko) | 2016-12-23 | 2017-12-22 | 내식성 및 가공성이 우수한 용융 알루미늄계 도금강재 및 그 제조방법 |
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KR102175731B1 (ko) * | 2018-11-28 | 2020-11-06 | 주식회사 포스코 | 용접성 및 인산염처리성이 우수한 합금화 알루미늄도금강판 및 그 제조방법 |
US11491764B2 (en) | 2018-11-30 | 2022-11-08 | Posco | Iron-aluminum-based plated steel sheet for hot press forming, having excellent hydrogen delayed fracture properties and spot welding properties, and manufacturing method therefor |
EP3889315A4 (en) * | 2018-11-30 | 2021-11-24 | Posco | ALUMINUM-BASED STEEL PLATE FOR HOT PRESSING FORMS WITH EXCELLENT PROPERTIES AGAINST DELAYED HYDROGEN-INDUCED BREAKAGE AND SPOT WELDING PROPERTIES AND THE PROCESS FOR ITS MANUFACTURING |
KR102307954B1 (ko) | 2019-12-20 | 2021-09-30 | 주식회사 포스코 | 가공성 및 내식성이 우수한 알루미늄계 합금 도금강판 및 이의 제조방법 |
KR102311502B1 (ko) * | 2019-12-20 | 2021-10-13 | 주식회사 포스코 | 가공성 및 내식성이 우수한 알루미늄계 합금 도금강판 및 이의 제조방법 |
DE202019107269U1 (de) * | 2019-12-30 | 2020-01-23 | C4 Laser Technology GmbH | Verschleiß- und Korrosionsschutzschicht aufweisende Bremseinheit |
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KR101569505B1 (ko) * | 2014-12-24 | 2015-11-30 | 주식회사 포스코 | 내박리성이 우수한 hpf 성형부재 및 그 제조방법 |
EP3561140A4 (en) * | 2016-12-21 | 2019-12-25 | Posco | ALUMINUM PLATED STEEL SHEET WITH HIGH MANGANESE HOT DIP PROVIDED WITH EXCELLENT SACRIFICIAL ELECTRODE PROTECTION AND EXCELLENT FOLDING ABILITY AND MANUFACTURING METHOD THEREOF |
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WO2018117769A1 (ko) | 2018-06-28 |
US20190381764A1 (en) | 2019-12-19 |
EP3561141A4 (en) | 2019-12-18 |
CN110100038B (zh) | 2021-10-29 |
CN110100038A (zh) | 2019-08-06 |
EP3561141A1 (en) | 2019-10-30 |
US11090907B2 (en) | 2021-08-17 |
KR101858863B1 (ko) | 2018-05-17 |
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