The main characteristics of new generation steel are high purity, high uniformity and ultra - fine grain. Structure refining treatment of iron and steel material is proved to be the optimum way that can improve strength and toughness. In this paper, the main research results of fining technology for micro - scale ultra - fine grain steel are summarized, the specific techniques, and applicability are briefly discussed. Furthermore, some special problems and research trends of this area are analyzed from the ...