Slag film flowing of cyclone burner is analyzed in this paper and the solution equa- tion set for slag film thickness is presented.

An experimental apparatus for simulating copper mold was used to quantify the heat flux density through the slag film of mould flux,and a solid slag was obtain for further studying the influence of slag film microstructure on heat flux density by microscope, scanning electron microscope and X-ray diffraction.

Heat flux of slag film in mold was simulated in the laboratory by a homemade device which can quantify the heat flux and acquire the slag film.

The flux film between mold and billet directly affects the heat transfer and lubrication of the billet,because F-free mold powder differs from the traditional powder,the characters and its heat behavior are the key to the development of F-free mold powder.

The present paper studied the solidified film structure,mineralogical compositions and crystallizing-out rate of the mould flux for the thin slab continuous casting and analyzed the effect of the structure of the solidified flux film on the heat transfer of the slab as well as the proper way to improve the surface quality of the slab by controlling the solidified microstructure of the flux film.

A simulated appartus is designed for measuring the heat transfer through the layer of continuouns casting flux between the mold and the solidified shell,and it is used to study the heat transfer behavior of flux film in the continuous casting mold.

The solidified flux film of mould powder for beam blank of Nb micro-alloyed medium carbon steel was studied by optical microscope, scanning electron microscope and X-ray diffraction analysis.

The composition of flux effect film phases and erforrnance directly,whether flux suit to produce of casting, the key is whether composition is fit,so it is important that research on influence of composition of mould flux for casting on phases and performance.