The main propose of this paper is to show using the case study method to explain how the total quality system was used in the cold rolling mill of a steel industry in Brazil. Conclusions and consequences of this work may be through the implementation of the total quality system, the technical capabilities were optimized, resulting in a lower cost of production, less investment with the maximum productive capacity of each equipment and production lines, in an Ideal Cost. With this Ideal Cost, we expect a greater production volume coupled with the excellence in the quality of the cold rolled product of the steel industry.