Recrystallization and grain coarsening control in processing high niobium microalloyed line pipe steels

摘要

The effect of solute niobium in retarding coarsening rate of austenite in upstream thermo mechanical controlled rolling of high niobium (0.1wt%Nb) low interstitial steel is analyzed. Solute drag effect of niobium in retarding boundary migration in static recrystallization is examined in thermo-mechanical controlled rolling of high Nb microalloyed steel. The importance of austenite grain refinement prior to pancaking in compact strip rolling of high Nb microalloyed steel as a means to increase surface area to volume ratio of pancaked austenite grain is emphasized. This is to promote adequate nucleation sites for phase transformation even under conditions of reduced strain accumulation resulting from low total rolling reduction below temperature of no recrystallization.