The immersion time of Fe Mn alloy particle gets longer with the increase of particle size as alloy .

Possibility of oxidizing dephosphorization for Fe-Mn alloys is discussed on the basis of thermodynamic analysis and the previous experimental data.

As the reduction time elongated,the small grain of metallic iron gathered towards the larger one gradually.

The present paper first gives a brief introduction of the situation in China's manganese ferroalloy industry and then offers a detailed analysis on the recent changes of the demands for the manganese ferroalloy products.

Deoxidising high quality aluminium killed steel with silicon-free ferroaluminium-manganese instead of purd aluminium exists some problems such as the production cost is increased,steel quality is impaired etc.