Microstructure Refinement of Steels by TSCR Technology

In this chapter, the microstructure and properties of low carbon steel produced by TSCR (Thin Slab Casting and Rolling) technology are studied, and compared with that of traditional process. The microstructure refinement and austenite recrystallization of low carbon steel produced by TSCR technology are presented. The characteristic and the mechanism of A1N precipitation in the steel are discussed based experimental results. The dynamics and corresponding model of precipitation during the heating and rolling are discussed also. The influences of A1N particles on the precipitation action in austenite region and on the ferrite transformation are analyzed. In addition, the softening mechanisms of low carbon steel for cold rolling by TSCR are explained. These include the property requirements of cold-rolled drawing sheets to hot strip, softening methods, grain coursing and softening mechanisms of B added low-carbon steel, the effects of the hot rolling and cooling technology on the softening of low carbon steel as well as the influences of different softening technology on the formability of cold-rolled 08A1 steels. On the other hand, the sulfide and oxide dispersive precipitates, other nanometer precipitates in the CSP low carbon steels, the carbides and carbonitrides in Ti containing steels, are introduced also in this chapter.