Patent ID: 6423426
Filing Date: 2002-07-23
Classification: B32B,C21D,C22C,C23C,Y10T

Abstract:
A high-strength galvanized steel sheet having excellent ductility, characterized by comprising, a galvanized layer or an alloyed galvanized layer on the surface of a steel sheet,the steel sheet having a composition comprising C: 0.05-0.20 mass %, Si: 0.3-1.8 mass %, Mn: 1.0-3.0 mass %, Fe of the balance and inevitable impurities, and comprising a composite structure having tempered martensite, retained austenite, ferrite and a low-temperature transformation phase, the tempered martensite being contained in an amount of 20% or more by volume, and the retained austenite being contained in an amount of 2% or more by volume.