Patent ID: 9040169
Filing Date: 2015-05-26
Classification: C21D,C22C,C23C,Y10T

Abstract:
1. A galvanized steel sheet, comprising, in mass percent: C: 0.12-0.3%; Si: greater than 0 and 0.1% or less; Mn: 2.0-3.5%; P: greater than 0 and 0.05% or less; S: greater than 0 and 0.05% or less; Al: 0.005-0.1%; N: greater than 0 and 0.015% or less; with the balance being iron and unavoidable impurities, and a hot-dip zinc plating layer or an alloyed hot-dip zinc plating layer on the surface of the galvanized steel sheet, wherein the galvanized steel sheet has a tensile strength of 980 MPa or more, excellent workability and high yield ratio, metallic structure thereof contains bainite as a matrix structure, an area ratio of ferrite: 3-18%; and an area ratio of martensite: 10-35% in terms of ratio to the entire structure.