HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET AND PROCESS FOR MANUFACTURING SAME

摘要

A high-strength galvanized steel sheet whose base steel is a high-strength steel sheet containing Si, Mn, and B and which has good coating adhesiveness and a production method therefor are provided. A base steel sheet containing Si, Mn, and B is oxidized at a heating temperature of steel sheet T that satisfies formula below, and then subjected to reduction-annealing and galvanizing. T ‰¥ 58.65 × Si + 294400 × B - 13.59 × O 2 + 548.1
[Si]: amount of Si in the steel on a mass percent basis
[B]: amount of B in the steel on a mass percent basis
[O 2 ]: O 2 concentration on a volume percent basis in an atmosphere at oxidizing treatment