6  Soft reduction stands are installed at each strand of 6 strands caster for 280 mm×380 mm bloom. The soft  reduction  in  height  of  bloom  is  ≤8  mm  wih  reduction  rate≤1.5mm/m.Results  showed  that  with  suitable  process conditions and using dynamic soft reduction technology

the center porosity of bloom was improved led to obviously improve the  center  stripe  at  waist  of heavy  rail  of steel  U75V

and  the  rejection  rate  by  non-destructive  testing  decreased  from 0.206%  to0.095%  due  to  improvement  of distribution  of inclusions  in  bloom.