The features of dynamic transformation for grain refinement of low
carbon steels are presented and representative results of trial hot
strip productions are reported. Laboratory experiments have established
that dynamic transformation occurs in under-cooled austenite
under suitable deformation conditions. Trial production results
showed that utilizing the dynamic transformation concept, grain refinement
of ferrite is feasible in commercial hot strip mills: a ferrite
grain size of 2~3 μm can be obtained, along with various controlled
second phases.