JP2020509205A - 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 abstract description 69
- 239000010959 steel Substances 0.000 title claims abstract description 69
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- 238000007747 plating Methods 0.000 claims abstract description 89
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- 229910021364 Al-Si alloy Inorganic materials 0.000 description 3
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- 230000015572 biosynthetic process Effects 0.000 description 3
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/012—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of aluminium or an aluminium alloy
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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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
- C23C2/26—After-treatment
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Abstract
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 (16)
- 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Al濃化層の平均厚さは0.5〜2μm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。
- 前記下部合金層は、45〜60重量%のFeを含む、請求項5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4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4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8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10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、を含む、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12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、請求項12に記載の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14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12〜15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。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
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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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 |
MX2021006199A (es) | 2018-11-30 | 2021-07-16 | Posco | Lamina de acero chapada en base de hierro-aluminio para formacion en prensa caliente, que tiene excelentes propiedades de fractura retardada de hidrogeno y propiedades de soldabilidad por puntos y metodo de manufactura de la misma. |
KR102311502B1 (ko) * | 2019-12-20 | 2021-10-13 | 주식회사 포스코 | 가공성 및 내식성이 우수한 알루미늄계 합금 도금강판 및 이의 제조방법 |
KR102307954B1 (ko) * | 2019-12-20 | 2021-09-30 | 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 |
KR102196682B1 (ko) * | 2020-05-25 | 2020-12-30 | 주식회사 네오스라이트 | Led 등기구용 용융 알루미늄 도금 방열 플레이트 pcb 기판 및 그의 제조방법 |
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CN112730487A (zh) * | 2020-12-17 | 2021-04-30 | 河钢股份有限公司 | 铝硅涂层钢残余应力测量试样的制备方法及其测量方法 |
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CN110100038B (zh) | 2021-10-29 |
WO2018117769A1 (ko) | 2018-06-28 |
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