| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a high-strength hot-dip galvanized steel plate manufactured using a steel plate containing Si and Mn as a base material and having excellent resistance to the peeling of a galvanized film when subjected to a high degree of processing. <P>SOLUTION: The steel plate comprising, by mass%, 0.01-0.18% C, 0.02-2.0% Si, 1.0-3.0% Mn, 0.001-1.0% Al, 0.005-0.060% P,≤0.01% S and the balance being Fe and unavoidable impurities is subjected to annealing and hot-dip galvanizing treatment in continuous hot-dip galvanizing equipment. In a heating process, heating is performed by regulating the temperature rising rate to≥7°C/s in a temperature range in a heating furnace of 600-750°C. Preferably, heating is performed by regulating the dew point of the atmosphere to -5°C or higher in a temperature range in the heating furnace of A°C to B°C (A: 600≤A≤780, B: 800≤B≤900). <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
