Patent application title: Galvanized steel sheet, method of manufacturing hot-dip galvanized steel sheet, and method of manufacturing alloyed hot-dip galvanized steel sheet

摘要

In the plated steel sheet, the chemical composition is, by mass%, at least C: 0.03% to 0.70%, Si: 0.25% to 2.50%, Mn: 1.00% to 5.00%, P : 0.100% or less, S: 0.010% or less, sol. Al: 0.001% to 2.500, N: not more than 0.020%, the balance being iron and impurities, and the metal structure is more than 5.0% by volume of retained austenite, more than 5.0% by volume It contains tempered martensite, and it is satisfied that the amount of C in retained austenite is 0.85 mass% or more.