| 摘要 |
Disclosed is a high-strength hot-dip galvanized steel sheet produced from a steel sheet containing Si and Mn as a base material and excellent in coating appearance, corrosion resistance, resistance to coating delamination during severe forming, and formability during severe forming. Also disclosed is a method for producing the high-strength hot-dip galvanized steel sheet. In a heating process for annealing, the following (Condition 1) to (Condition 3) are used.
(Condition 1) In the heating process for annealing, the rate of temperature rise when the temperature inside an annealing furnace is in a temperature range of from 450°C to A°C inclusive (where A is an arbitrary value selected in a range of 500 ‰¤ A) is 7°C/sec. or more.
(Condition 2) The maximum steel sheet temperature reached during the annealing is 600°C or higher and 750°C or lower.
(Condition 3) When the temperature of the steel sheet is in a temperature range of from 600°C to 750°C inclusive during the annealing, the transit time of the steel sheet in the temperature range of from 600°C to 750°C inclusive is 30 seconds or longer and 10 minutes or shorter, and the dew point of an atmosphere is -45°C or lower. |
