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

pA 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./p