JP5757061B2 - 合金化溶融亜鉛めっき熱処理鋼材及びその製造方法 - Google Patents
合金化溶融亜鉛めっき熱処理鋼材及びその製造方法 Download PDFInfo
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Description
別の観点からは、本発明は、支持手段で保持された被加工材である、めっき付着量が片面当り30g/m2以上90g/m2以下であり、Fe濃度が質量%で20%以下であるとともに表面粗度Raが0.8μm以下であるめっき皮膜を少なくとも片面に有する合金化溶融亜鉛めっき鋼材を上流側から逐次または連続的に移動させながら、支持手段の下流側に設けられた加熱手段および冷却手段を用いて、合金化溶融亜鉛めっき鋼材の少なくとも一部を、3.0×102℃/s以上の昇温速度で8.0×102℃以上9.5×102℃以下の温度域に加熱し当該温度域での滞在時間を2秒以下とし、1.5×102℃/s以上の冷却速度で冷却する熱処理を行いつつ、冷却手段の下流側に設けられた可動クランプ手段で合金化溶融亜鉛めっき鋼材をクランプしながら、可動クランプ手段を移動させることで加熱された領域を曲げ加工により塑性変形することにより、熱処理が行われた部分の少なくとも一部の表面に残存する皮膜の付着量が片面当り20g/m2以上80g/m2以下であり、この皮膜中のFe濃度が15%以上35%以下であり、かつこの皮膜にη相が存在し、さらに、この皮膜の表面におけるJIS B 0601により規定される中心線平均粗さRaが1.5μm以下である合金化溶融亜鉛めっき熱処理鋼材を製造することを特徴とする合金化溶融亜鉛めっき熱処理鋼材の製造方法である。
1a 亜鉛系めっき鋼材
1b 亜鉛系めっき熱処理鋼材
2 支持手段、支持ロール
3 押し出し装置
4 可動ローラダイス
5 高周波加熱コイル
6 冷却装置
本実施の形態の合金化溶融亜鉛めっき熱処理鋼材は、少なくとも片面に合金化溶融亜鉛めっきを行われた合金化溶融亜鉛めっき鋼材の少なくとも一部を焼入可能温度域に加熱する熱処理を行われた合金化溶融亜鉛めっき熱処理鋼材であって、熱処理を行われた部分の少なくとも一部の表面に残存する皮膜の付着量が片面当り20g/m2以上80g/m2以下であり、この皮膜中のFe濃度が15%以上35%以下であり、かつこの皮膜にη相が存在し、さらに、この皮膜の表面におけるJIS B 0601により規定される中心線平均粗さRaが1.5μm以下である。
本発明の製造方法において、実用的な価値が高いのは、素地鋼板から製管された鋼管等の長尺の部材からなる合金化溶融亜鉛めっき鋼材として用い、焼入、若しくは加熱後に熱間曲げ加工、または同時に焼入と熱間曲げ加工とを行うことにより、合金化溶融亜鉛めっき熱処理鋼材を得ることができる点である。
図1に示す製造装置では、被加工材1は横断面形状が円形の丸管であり、被加工材である合金化溶融亜鉛めっき鋼材1aを逐次連続的に加熱し、局部的な加熱部に可動ローラダイス4を用いて塑性変形させ、その直後で冷却することにより、合金化溶融亜鉛めっき熱処理鋼材1bを製造する。
本発明の効果を確認するため、表1に示す化学組成を有する素地鋼板(表1に示す以外の残部はFe及び不純物)を用いて溶融亜鉛めっき及び合金化処理を施し、板厚が1.6mmの合金化溶融亜鉛めっき鋼板を製造した。
Claims (5)
- 支持手段で保持された被加工材である、少なくとも片面に合金化溶融亜鉛めっきが行われた合金化溶融亜鉛めっき鋼材を上流側から逐次または連続的に移動させながら、前記支持手段の下流側に設けられた加熱手段および冷却手段ならびに前記冷却手段の下流側に設けられた可動クランプ手段を用いて、前記合金化溶融亜鉛めっき鋼材の少なくとも一部を焼入可能温度域に加熱し、前記クランプ手段で前記合金化溶融亜鉛めっき鋼材をクランプしながら前記クランプ手段を移動させて被加熱部を塑性変形させた後、急冷する熱処理を行うことによって製造される合金化溶融亜鉛めっき熱処理鋼材であって、該熱処理が行われた部分の少なくとも一部の表面に残存する皮膜の付着量が片面当り20g/m2以上80g/m2以下であり、該皮膜中のFe濃度が質量%で15%以上35%以下であり、かつ該皮膜にη相が存在し、さらに、該皮膜の表面におけるJIS B 0610により規定される中心線平均粗さRaが1.5μm以下であることを特徴とする合金化溶融亜鉛めっき熱処理鋼材。
- 前記熱処理では、3.0×102℃/s以上の昇温速度で8.0×102℃以上9.5×102℃以下の温度域に加熱し当該温度域での滞在時間を2秒以下とし、1.5×102℃/s以上の冷却速度で冷却することを特徴とする請求項1に記載された合金化溶融亜鉛めっき熱処理鋼材。
- 前記皮膜中に質量%で0.45%以下のAlを含有することを特徴とする請求項1または請求項2に記載された合金化溶融亜鉛めっき熱処理鋼材。
- 支持手段で保持された被加工材である、めっき付着量が片面当り30g/m2以上90g/m2以下であり、Fe濃度が質量%で20%以下であるとともに表面粗度Raが0.8μm以下であるめっき皮膜を少なくとも片面に有する合金化溶融亜鉛めっき鋼材を上流側から逐次または連続的に移動させながら、前記支持手段の下流側に設けられた加熱手段および冷却手段を用いて、前記合金化溶融亜鉛めっき鋼材の少なくとも一部を、3.0×102℃/s以上の昇温速度で8.0×102℃以上9.5×102℃以下の温度域に加熱し当該温度域での滞在時間を2秒以下とし、1.5×102℃/s以上の冷却速度で冷却する熱処理を行いつつ、前記冷却手段の下流側に設けられた可動クランプ手段で前記合金化溶融亜鉛めっき鋼材をクランプしながら、前記可動クランプ手段を移動させることで前記加熱された領域を塑性変形することにより、熱処理が行われた部分の少なくとも一部の表面に残存する皮膜の付着量が片面当り20g/m2以上80g/m2以下であり、該皮膜中のFe濃度が質量%で15%以上35%以下であり、かつ該皮膜にη相が存在し、さらに、該皮膜の表面におけるJIS B 0610により規定される中心線平均粗さRaが1.5μm以下である合金化溶融亜鉛めっき熱処理鋼材を製造することを特徴とする合金化溶融亜鉛めっき熱処理鋼材の製造方法。
- 前記めっき皮膜中に質量%で0.35%以下のAlを含有することを特徴とする請求項4に記載の合金化溶融亜鉛めっき熱処理鋼材の製造方法。
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JP5578038B2 (ja) * | 2009-11-13 | 2014-08-27 | 新日鐵住金株式会社 | 曲げ加工部材の製造方法 |
JP2012036463A (ja) * | 2010-08-09 | 2012-02-23 | Sumitomo Metal Ind Ltd | Zn−Al−Mg系めっき熱処理鋼材およびその製造方法 |
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DE102012219639A1 (de) * | 2012-05-31 | 2013-12-05 | Kunststoff-Technik Scherer & Trier Gmbh & Co. Kg | Verfahren zum Rollbiegen eines Profils, Profil, Verfahren zur Herstellung gebogener Profilwerkstücke, gebogenes Profilwerkstück, Vorrichtung zum Rollbiegen eines Profils sowie Extrusions- und Rollbiegelinie |
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