The reasons of center porosity,shrinkage cavities and surface quality in CC bloom of Martensite stainless steel have been analyzed and the effect of Mould-Electromagnetic Stirring and other factors on center porosity,shrinkage cavities and surface quality has been investigated.

The results show that application of appropriate electromagnetic stirring parameters can improve the macrostructure of austenitic stainless steel,in which both columnar grains and equiaxed grains are evidently refined and center porosity and shrinkage cavity can be remarkably decreased,and enlarging equiaxed grains zone.

Center segregation and center porosity will seriously affect the internal slab quality for continuous casting bloom.

On the industrial experiments the effect of electromagnetic stirring on central porosity,equiaxial crystal ratio,shrinkage cavities and surface quality as well as effect of electromagnetic stirring on the solidification of the continuous casting billet have been analyzed and discussed.

At the present production conditions,the results of trials showed that centerline segregation and central porosity are improved.

Soft reduction zone is a key parameter of soft reduction technology,which can impact on improvement of the centerline segregation and porosity under soft reduction at the final stage of solidification.

Effect of process parameters of cross wedge rolling on the internal rarefaction;