JP2014227562A - 高強度合金化溶融亜鉛めっき鋼板の製造方法 - Google Patents
高強度合金化溶融亜鉛めっき鋼板の製造方法 Download PDFInfo
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Abstract
【解決手段】Si、Mnを含有する鋼板に対して、雰囲気の酸素濃度が1vol%未満の領域において、鋼板の平均昇温速度が20℃/sec以上かつ最高到達温度Tが400℃〜500℃となるように酸化処理を行い、次いで、雰囲気の酸素濃度が1vol%以上の領域において、鋼板の平均昇温速度が10℃/sec未満かつ最高到達温度が600℃以上となるように酸化処理を行い、次いで、還元焼鈍、溶融亜鉛めっき処理を行い、更に460〜600℃の温度で10〜60秒間加熱して合金化処理を行う高強度合金化溶融亜鉛めっき鋼板の製造方法。
【選択図】なし
Description
焼鈍工程においてSiやMnの酸化物が鋼板表面に形成してしまうために、十分な鋼板とめっき層との密着性を確保することが困難である。そこで、特許文献1〜9に示されているように、鋼板を一度酸化させ鋼板表面に酸化鉄からなる皮膜を形成させた後に、還元焼鈍を行うことが有効である。また、特許文献8、9には酸化処理を急速昇温することで、更にめっき性が改善される技術が開示されている。
[1]Si、Mnを含有する鋼板に対して、雰囲気の酸素濃度が1vol%未満の領域において、鋼板の平均昇温速度が20℃/sec以上かつ最高到達温度Tが400℃〜500℃となるように酸化処理を行い、次いで、雰囲気の酸素濃度が1vol%以上の領域において、鋼板の平均昇温速度が10℃/sec未満かつ最高到達温度が600℃以上となるように酸化処理を行い、次いで、還元焼鈍、溶融亜鉛めっき処理を行い、更に460〜600℃の温度で10〜60秒間加熱して合金化処理を行うことを特徴とする高強度合金化溶融亜鉛めっき鋼板の製造方法。
[2]前記酸素濃度が1vol%以上の領域での最高到達温度Tがさらに下式を満足することを特徴とする[1]に記載の高強度合金化溶融亜鉛めっき鋼板の製造方法。
T≦−80[Mn]−75[Si]+1030
[Si]:鋼中のSi質量%
[Mn]:鋼中のMn質量%
[3]鋼の化学成分がC:0.01〜0.20質量%、Si:0.5〜2.0質量%、Mn:1.0〜3.0質量%を含有し、残部がFeおよび不可避的不純物からなることを特徴とする[1]または[2]に記載の高強度合金化溶融亜鉛めっき鋼板の製造方法。
T≦−80[Mn]−75[Si]+1030 (1)
ここで、Tは酸素濃度が1vol%以上となる領域での最高到達温度、[Mn]は鋼中のMn質量%、[Si]は鋼中のSi質量%である。酸化反応が顕著に起こる酸素濃度1vol%以上での最高到達温度を制御することで、内部酸化物層の形成、強いてはめっき層中への地鉄の取り込みを抑制することが可能である。
C:0.01〜0.20%
Cは、鋼組織を、マルテンサイトなどを形成させることで加工性を向上しやすくする。そのためには0.01%以上が望ましい。一方、0.20%を超えると溶接性が劣化する。したがって、C量は0.01〜0.20%とする。
Siは鋼を強化して良好な材質を得るのに有効な元素である。Siが0.5%未満では高強度を得るために高価な合金元素が必要になり、経済的に好ましくない。一方、2.0%を超えると良好なめっき密着性を得るのが難しくなる。また、過剰な内部酸化が形成される。したがって、Si量は0.5〜2.0%が好ましい。
Mnは鋼の高強度化に有効な元素である。機械特性や強度を確保するためは1.0%以上含有させることが好ましい。3.0%を超えると溶接性や強度延性バランスの確保が困難になる場合がある。また、過剰な内部酸化が形成される。したがって、Mn量は1.0〜3.0%が好ましい。
Pは不可避的に含有されるものである。0.025%を超えると溶接性が劣化する場合がある。したがって、P量は0.025%以下が望ましい。
Sは不可避的に含有されるものである。下限は規定しないが、多量に含有されると溶接性が劣化する場合があるため、0.010%以下が好ましい。
蛍光X線カウント数 ランク
0−500未満 :1(良)
500−1000未満 :2
1000−2000未満:3
2000−3000未満:4
3000以上 :5(劣)
めっき層中への地鉄の結晶粒の取り込みは、以下の方法で行った。合金化処理後のサンプルを、エポキシ系樹脂に埋め込み研磨した後に、SEMを用いて反射電子像の観察を行った。反射電子像は原子番号によってコントラストが変わるため、めっき層部分と地鉄部分を明確に区別することが出来る。よって、この観察像からめっき層中に明らかに地鉄の結晶粒の取り込みのあるものを×、僅かに地鉄の結晶粒の取り込みがあるものを△、地鉄の結晶粒の取り込みのないものを○として評価した。
Claims (3)
- Si、Mnを含有する鋼板に対して、雰囲気の酸素濃度が1vol%未満の領域において、鋼板の平均昇温速度が20℃/sec以上かつ最高到達温度Tが400℃〜500℃となるように酸化処理を行い、次いで、雰囲気の酸素濃度が1vol%以上の領域において、鋼板の平均昇温速度が10℃/sec未満かつ最高到達温度が600℃以上となるように酸化処理を行い、次いで、還元焼鈍、溶融亜鉛めっき処理を行い、更に460〜600℃の温度で10〜60秒間加熱して合金化処理を行うことを特徴とする高強度合金化溶融亜鉛めっき鋼板の製造方法。
- 前記酸素濃度が1vol%以上の領域での最高到達温度Tが、さらに下式を満足することを特徴とする請求項1に記載の高強度合金化溶融亜鉛めっき鋼板の製造方法。
T≦−80[Mn]−75[Si]+1030
[Si]:鋼中のSi質量%
[Mn]:鋼中のMn質量% - 前記鋼の化学成分がC:0.01〜0.20質量%、Si:0.5〜2.0質量%、Mn:1.0〜3.0質量%を含有し、残部がFeおよび不可避的不純物からなることを特徴とする請求項1または2に記載の高強度合金化溶融亜鉛めっき鋼板の製造方法。
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KR20170122723A (ko) | 2015-03-23 | 2017-11-06 | 신닛테츠스미킨 카부시키카이샤 | 열연 강판 및 그 제조 방법, 및 냉연 강판의 제조 방법 |
JP2020122195A (ja) * | 2019-01-31 | 2020-08-13 | Jfeスチール株式会社 | 溶融亜鉛めっき鋼板の製造方法 |
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JP6172297B2 (ja) * | 2014-09-08 | 2017-08-02 | Jfeスチール株式会社 | 高強度溶融亜鉛めっき鋼板の製造方法及び製造設備 |
JP6237937B2 (ja) * | 2016-03-11 | 2017-11-29 | Jfeスチール株式会社 | 高強度溶融亜鉛めっき鋼板の製造方法 |
KR102231412B1 (ko) | 2016-10-25 | 2021-03-23 | 제이에프이 스틸 가부시키가이샤 | 고강도 용융 아연 도금 강판의 제조 방법 |
JP2018162486A (ja) * | 2017-03-24 | 2018-10-18 | 株式会社神戸製鋼所 | 溶融亜鉛めっき用鋼板の加熱方法 |
DE102018102624A1 (de) * | 2018-02-06 | 2019-08-08 | Salzgitter Flachstahl Gmbh | Verfahren zur Herstellung eines Stahlbandes mit verbesserter Haftung metallischer Schmelztauchüberzüge |
JP6916129B2 (ja) * | 2018-03-02 | 2021-08-11 | 株式会社神戸製鋼所 | ホットスタンプ用亜鉛めっき鋼板およびその製造方法 |
DE102019108457B4 (de) | 2019-04-01 | 2021-02-04 | Salzgitter Flachstahl Gmbh | Verfahren zur Herstellung eines Stahlbandes mit verbesserter Haftung metallischer Schmelztauchüberzüge |
CN112813371B (zh) * | 2020-12-29 | 2023-09-26 | 湖南华菱涟源钢铁有限公司 | 双相钢镀锌的方法 |
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