Hot ductility of vanadium micro-alloying steel continuous casting slabs

The hot ductility of the V-containing micro-alloying steel CC (continuous casting) slabs and precipitation of vanadium carbide and nitride in the tensile specimens were investigated. The results indicate that the precipitation ratio and precipitation rate of vanadium in the specimens reach maximum respectively at 900, - 825 and 825 degreesC. There is still 100%-17% of vanadium precipitated when the deformation temperature decreases to 800-700 degreesC. Vanadium largely affects the ductility of the steel in the low ductility temperature Region III. Embrittlement of steel with higher V content is severer in the region and the embrittlement extends to lower temperature.