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The present study investigates the role of aluminium nitride (AlN) on grain boundary pinning during reheating in presence of niobium carbonitrides (Nb(C,N)) and subsequent evolution of grain size distribution. Three as continuously cast slabs of high strength low alloy steels containing different levels of Nb (between 0.045 -0.019 wt%) and Al (between 0.057 -0.02 wt%) have been characterized in terms of phase balance, ferrite grain size distribution and particle size distribution. Precipitatedoi:10.2355/isijinternational.54.677 fatcat:y26wafkt6vhtjmn7fo36sfljsa