Effect of Ti(C,N) Precipitation on Texture Evolution and Fish-Scale Resistance of Ultra-Low Carbon Ti-Bearing Enamel Steel

The Ti(C,N) precipitation and texture evolution in ultra-low carbon Ti-bearing enamel steel were studied to discover their correlation. Two different cooling paths of simulative coiling were adopted to gain different morphologies of Ti(C,N) precipitate in hot strips. It is found that the Ti(C,N) precipitate in hot strip using Path 2 (put into asbestos box and air cooled) are finer and much more in quantity than that in hot strip using Path 1 (held at 730 C for 30 min and furnace cooled). The morphology of Ti(C,N) precipitate in hot strip has great effect on recrystallization texture in the subsequent cold-rolled annealed sheet. γ-fiber texture of strong recrystallization is gained in cold-rolled and annealed sheet came from Path 1. On the contrary, in the one came from Path 2, the γ-fiber texture is weak. This may be due to the pinning force of numerous fine Ti(C,N) precipitate which retard the growth of preferential nucleated {111} orientated grains. Annealed steel sheets in the test came from both paths have excellent fish-scale resistance.