HIGH-RESISTANCE COLD LAMINATED STEEL SHEET HAVING EXCELLENT STRUCTURE FLANGE CAPACITY AND PRECISION DRILLING CAPACITY AND METHOD FOR PRODUCING THE SAME

摘要

Patent invention summary: "high -strength cold -rolled steel plate having excellent flanging capacity in the strain and accuracy drilling capability and method for its production". The present invention refers to aThe cold -rolled high -strength steel plate having excellent flange capacity in the drawing and precision perforation capacity containing predetermined components and the balance being composed of iron and unavoidable impuritiesIn which in a range of 5 /8 to 3 /8 in the sheet thickness from the steel sheet surface, the mean value of the Polo densities of the group of guidelines {100} 011 the {223} 110 represented by the respective crystal guidelines of {100} 011 ,{116} 110 ,{114} 110 ,{113} 110 ,{112} 110 ,{335} 110 ,And {223} 110 it is 6,5 or less, and the pole density of crystal orientation {332} 113 it is 5,0 or less, and the metal structure contains, in terms of area ratio, more than 5%perlita, the sum of bainite and martensite limited to less than 5%,And the ferrite compound balance.