Title:
PRODUCTION OF HOT DIPPED STEEL PLATE
Document Type and Number:
Japanese Patent JP3248432
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To produce a hot-dip Al-Zn alloy coated steel plate excellent in plating adhesion and surface appearance at a low cost while obviating the necessity of a descaling treatment stage, by using a hot rolled plate obtained by the ordinary process as a starting plate for plating.
SOLUTION: At the time of applying hot-dip Al-Zn alloy coating containing 2-15wt.% Al to a hot rolled steel plate in a continuous hot dipping line, the hot rolled steel plate having scale layer on the surface is introduced, without descaling treatment, into the continuous hot dipping line. In a reducing-gas atmosphere in a heat treatment furnace, the hot rolled steel plate is subjected to reducing treatment under the conditions satisfying inequality (60×RL)/LS +0.4×RT≥370, preferably inequality (60×RL)/LS+0.4×RT≥400 [where RT is the maximum ultimate plate temp. (°C) in the reducing zone of the heat treatment furnace, RL is the length (m) of the reducing zone of the heat treatment furnace, and LS is line speed (mpm)] and then to hot dipping.
Inventors:
Toshihiko Ohi
Akira Takase
Hajime Uesugi
Masaru Sagiyama
Akira Takase
Hajime Uesugi
Masaru Sagiyama
Application Number:
JP22058096A
Publication Date:
January 21, 2002
Filing Date:
August 02, 1996
Export Citation:
Assignee:
Nippon Steel Tube Co., Ltd.
International Classes:
C23C2/02; C23C2/06; (IPC1-7): C23C2/06; C23C2/02
Attorney, Agent or Firm:
Masatoshi Tomabechi
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