Modelling of Oxide Scale Evolution in Hot Rolling and Descaling

Oxide scale behaviour in thermomechanical processing has been the subject of intensive research for several years that allowed developing a finite element (FE) based model to simulate a range of events of relevance to the process and the surface quality of the hot rolled product. A range of experimental techniques have also been developed, each providing a partial insight. An overview of this research is presented in the sequence of rolling and finishing with descaling. The model has been extended to provide the basis for detailed numerical investigations of the roll/stock interface behaviour during multi-pass hot rolling operations. The modelling techniques have been used for providing design criteria for AISI430 ferritic stainless steel scale failure during bending. Modelling of near surface deformation during rolling of aluminium alloys is under consideration.

Thermomechanical treatment of reinforcing steel

The work deals with application of interstand and after deformation cooling of coiled ( .10, 12 mm) and reinforcing ( .14,16 mm) bar steel in the accelerated cooling installations behind the prefinishing and finishing stands of the light-section mill which provides the formation of the even fine-grained ferrite-perlite structure and reduces grain growth in the mid section of the coil. The application of the roll stock interstand cooling behind the 11th stand together with the afterdeformation accelerated roll stock cooling to 800-8500C enabled us getting reinforcing bar steel diameter .14mm with high impact strength..