Effect of Nanosized Precipitates on Corrosion Resistance of Nb-Microalloyed Steels

High-strength cold-rolled low-carbon microalloyed steels are widely used in the automotive industry. Preference is generally given to microalloying with niobium, since its effect on mechanical properties of steel most pronounced due both precipitation hardening and a reduction ferrite grain size. For operation car, corrosion resistance metal parts an important factor, since, along other material, it determines service life. The study structural state sheet Nb-microalloyed steels, processed continuous annealing units, their has been carried out. Methods optical, scanning transmission electron microscopy, tests were used. It shown that one main factors determine rolled products size nanosized NbC precipitates. influence temperature parameters hot rolling formation established. An increase temperatures end coiling, as well annealing, leads average stock after which increases under consideration.