Study of Laboratorial Simulation of V-N Microalloyed CSP Steel

摘要

Gleeble 1500D simulation machine was utilized to laboratorially simulate the production process of V-N microalloyed CSP steel strips. The results show that, in the incipient period of continuous casting, almost all Ti precipitates from the steel as TiN. With decreased temperature of the casting slab, V starts to precipitate with TiN as nucleation core or nucleate independently. After soaking, most of homogeneously-nucleated V(C,N) tends to re-dissolve, and the rest, which is difficult to dissolve, starts to grow up, while V in (Ti,V)(C,N) dissolve partially and thus V content in these particles reduces. During tandem rolling process, V(C,N) precipitates from the steel again, homogeneously or attachingly, all of which plays a role of preventing austenite grain from growing up and facilitates ferrite nucleation, increasing transformation ratio to refine ferrite microstructure eventually.