Patent ID: 9435013
Filing Date: 2016-09-06
CPC Classification: C21D,C22C

Claim Text:
1. A cold-rolled steel sheet characterized by having: a chemical composition comprising, in mass %, C: 0.01-0.3, Si: 0.01-2.0, Mn: 0.5-3.5, P: at most 0.1, S: at most 0.05, Nb: 0-0.03, Ti: 0-0.06, V: 0-0.3, sol. Al: 0-2.0, Cr: 0-1.0, Mo: 0-0.3, B: 0-0.003, Ca: 0-0.003, REM: 0-0.003, and a remainder of Fe and impurities; a microstructure having a main phase of ferrite which comprises at least 50% by area and a second phase containing a total of at least 10% by area of a low temperature transformation phase including one or more of martensite, bainite, pearlite, and cementite and 0-3% by area of retained austenite, and satisfying Equations (1), (2) and (3) below; and a texture in which the average X-ray intensity for the [111]<145>, [111]<123>, and [554]<225> orientations at a depth of ½ of a sheet thickness is at least 4.0 times an average X-ray intensity of a random structure which does not have a texture; wherein E in Equations (1) and (2), d in Equation (3), d