The 6.5% Si silicon-steel sheet has excellent electromagnetic properties.It is an idea material for electro- magnetic device to realize high efficiency
save energy and portability. The history of investigation on 6.5% Si sheet is presented and the preparation technique such as cold rolling
quenching solidifying of molten steel
thin film process
CVD process
powder-sintering rolling process
PCVD process and electrodeposition of molten salt electralytes is reviewed. It is pointed in this paper that at present the key research is to develop economic and high efficiency preparation technique.