Titanium (Ti)-containing ultra-low carbon cold-rolled steel plate material

摘要

The present invention relates to a method for securing a material of a Ti-containing extremely low-carbon cold-rolled steel sheet bad material to be used for automobile bodies and the like, and a method for grasping a material of a poor quality material of a Ti-The present invention provides a method of treating a defective material of a Ti-containing low-carbon cold-rolled steel sheet which can secure a material of a target material grade by reheating the defective material.;The present invention provides a method for securing the quality of a material bad material which is generated when a Ti-containing extremely low carbon steel cold-rolled steel sheet for use in machining and deep-processing is machined by the continuous annealing method, 670 to 680C for deep drawing, 680 to 700C for deep drawing, and 700 to 720C for deep drawing, respectively, for 3 hours or more, respectively, so that the material of the Ti-containing low carbon cold-The material processing method that can be ensured is as its point.