| 摘要 |
Provided are: a high-strength hot-dipped galvanized steel sheet which uses, as a base material, a high-strength steel sheet containing Si, Mn and Cr and has excellent plating adhesion; and a method for producing the high-strength hot-dipped galvanized steel sheet. In an oxidation furnace, steel containing Si, Mn and Cr is subjected to an oxidation treatment at an exit side temperature (T), and then the steel is subjected to reduction annealing and hot dip galvanization. Alternatively, the steel is alloyed by being heated to a temperature of 460-600°C for 10-60 seconds. In this connection, the exit side temperature (T) satisfies the following conditions. A = 0.015T - 7.6 (T = 507°C) A = 0 (T < 507°C) B = 0.0063T - 2.8 (T = 445°C) B = 0 (T < 445°C) [Si] + A × [Cr] = B [Si]: mass% of Si in the steel [Cr]: mass% of Cr in the steel |
