JP2019521257A - 低密度溶融亜鉛めっき鋼及びその製造方法 - Google Patents
低密度溶融亜鉛めっき鋼及びその製造方法 Download PDFInfo
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Abstract
Description
(1)ストリップ鋼を製造する工程と、
(2)750℃〜950℃の均熱温度まで加熱した後、30秒間〜600秒間保持するストリップ鋼の連続焼鈍の工程であって、焼鈍雰囲気の露点が−15℃〜20℃である、工程と、
(3)溶融めっきの工程と、
を含む、方法を提供する。
(1)焼鈍雰囲気の露点を制御することによって、低密度鋼の表面上での外部酸化によるAl2O3の形成が抑制され、これが基板の表面層の内部酸化へと転じ、鉄粒子が基板の表面層上に形成されることで、ストリップ鋼の亜鉛めっき性及びコーティング層の接着性が改善する。
(2)本発明の低密度溶融亜鉛めっき鋼は、25%超の伸び、800MPa超の引張強度及び7500kg/m3未満の密度を有する。
表1に、実施例A1〜A16における低密度溶融亜鉛めっき鋼及び比較例B1〜B6における従来の鋼板の成分中の化学元素の質量百分率を挙げる。
(1)ストリップ鋼の製造:鋼を表1の組成に従って製錬し、鋳造スラブを0.5時間〜3時間の保持時間で1000℃〜1250℃に加熱し、仕上圧延温度を800℃〜900℃に制御し、次いで熱間圧延板を500℃〜750℃で巻き取り、熱間圧延コイルを巻きほどいた後、酸洗い及び冷間圧延に供した。冷間圧下率は30%〜90%とした。
(2)ストリップ鋼の連続焼鈍:750℃〜950℃の均熱温度に加熱した後、30秒間〜600秒間保持する。加熱速度は1℃/秒〜20℃/秒とし、加熱部及び保持部の雰囲気はN2及びH2の混合ガスであり、H2の体積含有率は0.5%〜20%とし、焼鈍雰囲気の露点は−15℃〜20℃とした。
(3)溶融めっき:連続焼鈍後のストリップ鋼を、溶融亜鉛浴に入るときのストリップ鋼の温度まで冷却した。冷却速度は1℃/秒〜150℃/秒とし、溶融亜鉛浴に入るときのストリップ鋼の温度は亜鉛浴の温度より0℃〜20℃高くした。次いで、ストリップ鋼を溶融めっきのために溶融亜鉛浴の亜鉛浴に浸漬した。亜鉛浴の温度は、選択された亜鉛浴成分の融点より30℃〜60℃高くした。ここで、亜鉛浴成分の質量百分率は、0.10%≦Al≦6%、0%<Mg≦5%であり、残部はZn及び他の不可避的不純物である。
Claims (25)
- 鋼のコア部分に位置する鋼基板と、該鋼基板の表面上に位置するコーティング層と、を備える低密度溶融亜鉛めっき鋼であって、
前記鋼基板と前記コーティング層との間に界面層が配置され、該界面層が鉄粒子層を含み、該鉄粒子層中において、前記鋼基板上に分散されて前記鋼基板を覆う鉄粒子が配置され、該鉄粒子が第1の阻止層によって覆われ、
前記低密度溶融亜鉛めっき鋼は、Al元素を3.0%〜7.0%の質量百分率で含有する、
低密度溶融亜鉛めっき鋼。 - 前記鋼基板が前記鉄粒子層との隣接部分に内部酸化層を有し、該内部酸化層がAl酸化物を含有する、請求項1に記載の低密度溶融亜鉛めっき鋼。
- 前記内部酸化層がMn酸化物を更に含有する、請求項2に記載の低密度溶融亜鉛めっき鋼。
- 前記内部酸化層が0.2μm〜10μmの厚さを有する、請求項2又は請求項3に記載の低密度溶融亜鉛めっき鋼。
- 前記内部酸化層の酸化物が粒界及び粒内に存在する、請求項2に記載の低密度溶融亜鉛めっき鋼。
- 前記界面層が0.1μm〜5μmの厚さを有する、請求項1に記載の低密度溶融亜鉛めっき鋼。
- 前記鉄粒子が0.1μm〜5μmの粒径を有する、請求項1に記載の低密度溶融亜鉛めっき鋼。
- 前記鉄粒子が前記鋼基板の表面積の30%以上を覆う、請求項1に記載の低密度溶融亜鉛めっき鋼。
- 隣接する前記鉄粒子間の最大間隔が前記鉄粒子の平均粒径の10倍以下である、請求項1に記載の低密度溶融亜鉛めっき鋼。
- 前記鋼基板の表面上で前記鉄粒子によって覆われない部分が第2の阻止層によって覆われる、請求項1に記載の低密度溶融亜鉛めっき鋼。
- 前記第2の阻止層の厚さが前記第1の阻止層の厚さ未満である、請求項10に記載の低密度溶融亜鉛めっき鋼。
- 前記第2の阻止層が、Fe元素、Al元素及びZn元素を含有する、請求項10又は請求項11に記載の低密度溶融亜鉛めっき鋼。
- 前記第1の阻止層が、Fe元素、Al元素及びZn元素を含有する、請求項1に記載の低密度溶融亜鉛めっき鋼。
- 前記鋼基板の微細構造がフェライト及び残留オーステナイトである、請求項1に記載の低密度溶融亜鉛めっき鋼。
- 前記残留オーステナイトの相比率が6%〜30%である、請求項14に記載の低密度溶融亜鉛めっき鋼。
- 前記残留オーステナイト中のC元素の質量百分率が0.8%以上である、請求項14又は請求項15に記載の低密度溶融亜鉛めっき鋼。
- 前記低密度溶融亜鉛めっき鋼の密度が7500kg/m3未満である、請求項1に記載の低密度溶融亜鉛めっき鋼。
- 前記鋼基板の化学元素の質量百分率が、C:0.25%〜0.50%、Mn:0.25%〜4.0%、Al:3.0%〜7.0%であり、残部がFe及び他の不可避的不純物である、請求項1又は請求項17に記載の低密度溶融亜鉛めっき鋼。
- 前記低密度溶融亜鉛めっき鋼は、25%超の伸び、及び800MPa超の引張強度を有する、請求項18に記載の低密度溶融亜鉛めっき鋼。
- 前記コーティング層が5μm〜200μmの厚さを有する、請求項1に記載の低密度溶融亜鉛めっき鋼。
- 請求項1〜請求項20のいずれか1項に記載の低密度溶融亜鉛めっき鋼を製造する方法であって、
ストリップ鋼を製造する工程(1)と、
750℃〜950℃の均熱温度まで加熱した後、30秒間〜600秒間保持するストリップ鋼の連続焼鈍の工程であって、焼鈍雰囲気の露点が−15℃〜20℃である、工程(2)と、
溶融めっきの工程(3)と、
を含む、方法。 - 前記工程(1)において、鋳造スラブを0.5時間〜3時間の保持時間で1000℃〜1250℃に加熱し、仕上圧延温度が800℃〜900℃であり、次いで熱間圧延板を500℃〜750℃で巻き取り、熱間圧延コイルを巻きほどいた後に酸洗い及び冷間圧延に供し、冷間圧下率が30%〜90%である、請求項21に記載の低密度溶融亜鉛めっき鋼を製造する方法。
- 前記工程(2)において、加熱部及び保持部の雰囲気がN2及びH2の混合ガスであり、H2の体積含有率が0.5%〜20%である、請求項21又は請求項22に記載の低密度溶融亜鉛めっき鋼を製造する方法。
- 前記工程(3)において、連続焼鈍後の前記ストリップ鋼を、溶融亜鉛浴に入るときのストリップ鋼の温度まで1℃/秒〜150℃/秒の冷却速度で冷却し、前記溶融亜鉛浴に入るときのストリップ鋼の温度が前記溶融亜鉛浴の温度より0℃〜20℃高く、次いで該ストリップ鋼を溶融めっきのために前記溶融亜鉛浴に浸漬し、前記溶融亜鉛浴の温度は、選択された亜鉛浴の成分の融点より30℃〜60℃高い、請求項21に記載の低密度溶融亜鉛めっき鋼を製造する方法。
- 前記工程(3)において、前記溶融亜鉛浴中の成分の質量百分率が、0.10%≦Al≦6%、0%<Mg≦5%であり、残部がZn及び他の不可避的不純物である、請求項24に記載の低密度溶融亜鉛めっき鋼を製造する方法。
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JP2023507960A (ja) * | 2019-12-20 | 2023-02-28 | ポスコホールディングス インコーポレーティッド | 表面品質と電気抵抗スポット溶接性に優れた高強度溶融亜鉛めっき鋼板及びその製造方法 |
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