Obtaining Multiphase Structure With A Subcritical Annealing Followed By Quenching In Water/Oil Din Ck55 Steel

Today, in the metallurgical industry there is a tendency to design new procedures or improve the classics, in the sense of an energy saving, reduction of processing steps and less environmental impact. With the process proposed in this paper, we try to replacing the classic thermal treatment for carbon steel in water / oil quenching and tempering, for one single stage subcritical annealing and quenching in water / oil; the tempering step is removed, and the mechanical properties obtained with the classical treatment are improved. The research was carried out with construction carbon steel (DIN CK55), manufactured by ThyssenKrupp Materials Ibérica, SA, achieving a complex multiphase structure of excellent mechanical performance.