COLD-ROLLED STEEL PLATE, GALVANIZED COLD-ROLLED STEEL PLATE, AND METHOD FOR MANUFACTURING SAID PLATES.

摘要

　A cold-rolled steel plate has a prescribed chemical composition, and a structure such that the area ratio of ferrite is at least 95%, the area ratio of residual austenite and the area ratio of martensite are 1-3% in total, the product of the area ratio of the residual austenite and the carbon concentration of the residual austenite is at least 1, and the value of I(111)/{I(100) + I(110)} in a region below the surface of the cold-rolled steel plate to a distance equating to one-quarter the thickness thereof is represented as 2 or less, where I(hkl) is the strength of the plane (hkl).