HIGH-STRENGTH THIN STEEL SHEET DRAWABLE AND EXCELLENT IN SHAPE FIXATION PROPERTY AND METHOD OF PRODUCING THE SAME

摘要

The present invention provides a high-strength thin steel sheet drawable and excellent in a shape fixation property and a method of producing the same. The present invention is a high-strength thin steel sheet drawable and excellent in a shape fixation property, characterized in that: on a plane at the center of the thickness of a steel sheet, the average ratio of the X-ray strength in the orientation component group of {100}<011> to {223}<110> to random X-ray diffraction strength is 2 or more and the average ratio of the X-ray strength in three orientation components of {554}<225>, {111}<112> and {111}<110> to random X-ray diffraction strength is 4 or less; the arithmetic average of the roughness Ra of at least one of the surfaces is 1 to 3.5 (m; the surfaces of the steel sheet are covered with a composition having a lubricating effect; and the friction coefficient of the steel sheet surfaces at 0 to 200~C is 0.05 to 0.2. Further, the present invention is a method of producing said steel sheet, characterized by: rolling a steel sheet having the chemical components specified in the present invention at a total reduction ratio of 25% or more in the temperature range of the Ar3 transformation temperature + 100~C or lower.