A new strategy for developing a Nb microalloyed fire-resistant steel: effects of boron and cooling rate

Abstract: This study investigates the correlation among cooling rates, boron addition, and their subsequent effects on the microstructure and mechanical properties of niobium microalloyed steels, specifically with an intent to develop new fire-resistant steels. Slower cooling rates enhanced the ferrite transformation and (Nb,Ti)C precipitation, promoting a shift toward an equilibrium-phase

Abstract: Fire-Resistant Steels (FRS) are widely used to ensure building stability during fire incidents, enabling safe evacuation. In this study, a FRS alloyed with Nb, Mo, B, and Ti was cast, thermomechanically processed, and aircooled to achieve the “as received” condition. The yield strength (YS) was evaluated through tensile tests