| 摘要 |
PROBLEM TO BE SOLVED: To provide a means for solving the problem of the delay in alloying which occurs in steel products containing easily oxidizable components by controlling the atmosphere during heating, thereby suppressing production of an oxide. SOLUTION: The method for manufacturing the galvannealed steel sheet composed of the steel sheet containing the easily oxidizable component as the base material comprises annealing the steel sheet containing the easily oxidizable components in a reducing atmosphere using zinc hot dip coating equipment of a total reduction system, then passing the steel sheet through the inside of the molten metal composed mainly of hot dip zinc coating, then alloying the plating by heating, wherein the production of the oxide caused on the surface of the steel sheet during annealing is suppressed. COPYRIGHT: (C)2005,JPO&NCIPI
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