The Influence of Additional Ni and Cu in Steel on the Galvanizability and Galvannealing Rate of Si-Mn Bearing Steels

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Other Title
  • Si, Mn鋼の溶融亜鉛めっき濡れ性および合金化挙動に及ぼす鋼中Ni, Cu添加の影響
  • Si Mn コウ ノ ヨウユウ アエンメッキ ヌレセイ オヨビ ゴウキンカ キョドウ ニ オヨボス コウ チュウ Ni Cu テンカ ノ エイキョウ

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Description

High strength steels have been developed in order to improve fuel economy as well as to increase safety. The conventional Si-Mn bearing high strength steels have the drawback of poor galvanisability due to the presence of complex Si-Mn oxides on their surface. In order to improve the galvanisability of Si-Mn steels, the effect of the addition of Ni and Cu on the wettability and galvannealing kinetics has been investigated.<BR>It was show that the addition of Ni and Cu improved wettability and increased the galvannealing rate. This improvement was due to the change of the sub-micron oxide morphology under a deoxidized Fe layer just before the galvanizing treatment (oxidized and deoxidized). In the case of C-Si-Mn steel a film of Si-Mn oxide was formed under a deoxidized Fe layer. The addition of Ni and Cu made Si-Mn oxide intermittently and internal oxide formed remarkably.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 92 (1), 21-29, 2006

    The Iron and Steel Institute of Japan

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