Avaliação de risco sobre a perda de ductilidade a quente de barras de aço CA-50

Abstract

The ability of a particular steel withstand the deformations occurring during hot rolling without fractures or severe cracks is called hot ductility, which is a function of several process parameters among which: billet quality, cut type, thermal cycle, process temperature, roughing mill strand, pass design, strain rate, and chemical composition. Several works address the hot ductility emphasizing the isolated influence of a particular variable as a quality criterion as the known Mn/S and Ni/Cu ratios by determining minimum. Globalization has been responsible for increasing competition among steelmakers that, to remain competitive in the market, have to seek innovations, paradigms breaks, bold strategies and take risks. In this work we carried out a risk assessment based on the ALARP principle (As Low As Reasonable Practical) through the joint analysis of key process variables responsible by hot shortness of steel used for the production of rebars CA- 50, aiming to an optimized solution for lower cost, ensuring the competitiveness and sustainability of the business.