Posted 28 Dec 2010 23:42
With the thin slab casting and rolling technology widely used, people gradually realized the thin slab casting and rolling production of hot rolled coil structure refinement, high strength, cold-rolled material not suitable for the characteristics used by the on the traditional process to a low carbon aluminum killed steel can be achieved with traces of grain coarsening B experience inspired the beginning of CSP B micro-alloying technology. Thin slab casting and rolling steel B without the ferrite grain size of 9 to 10, the grain size is 13.8 m, micro-alloying with B, after B plus ferrite grain size of 7 ~ 8, the grain size is 23.3 m, that increase the grain of steel B was coarse. Studies have shown that cold-rolled steel materials 08Al mass fraction (40 ~ 60) 10-6 in the B, in the hot rolling, cold rolling and annealing under the same circumstances, the yield strength decreased, the basic formability index n, r values decrease, fiber texture was weakened, Goss texture and rotated cube texture was enhanced. Research also believes that mass production of cold rolled plate DQ-class performance test data and found that the thickness 0.5 ~ 2.5mm strip the r0 value of 1.84 or above average, indicating a thin slab casting and rolling process on the deep-drawing cold rolled sheet performance is good. Currently, it has been on the B ferrite grain coarsening and reduce the strength of a clear understanding of the mechanism, and generally micro alloying with B solution to CSP the problem of high strength cold-rolled material has been mass production of cold-rolled steel materials SPHC, SPHD and SPHE.