COLD-ROLLED STEEL SHEET, ELECTROLYTIC ZINC-COATED COLD-ROLLED STEEL SHEET, HOT-DIP ZINC-COATED COLD-ROLLED STEEL SHEET, ALLOYED HOT-DIP ZINC-COATED COLD-ROLLED STEEL SHEET, AND METHODS FOR PRODUCING SAID STEEL SHEETS.

摘要

A cold-rolled steel sheet which contains, in mass%, 0.0005 to 0.0045% of C, 0.80 to 2.50% of Mn, 0.002 to 0.150% of Ti and 0.0005 to 0.01% of B, fulfills the requirement represented by formula (1), and also contains iron and unavoidable impurities as a remainder, wherein the random strength ratio (A) in the [332] <110> orientation is 3 or less and each of the random strength ratio (B) in the [557] <9 16 5> orientation and the random strength ratio (C) in the [111] <112> orientation is 7 or more as measured at a position corresponding to one-fourth of the thickness of the steel sheet, and the requirements represented by the formulae [(B)/(A) ≥ 5] and [(B) > (C)] are fulfilled.