The solidified film structure

mineralogical phase and crystallization rate of 1537 mm×67 mm mould pow- der(34.6CaO

28.6SiQ₂

8.8C

8.5F

8.6Na₂O)for Compact Strip Production(CSP)have been studied by optical and scanning electron microscope and X-ray diffraction analysis. The results showed that most of the solidified flux films had three layers with total thickness 0.6~1.3 mm:crystallizing layer - glassy layer - crystallizing layer

of which the thickness of crystallizing layer at the side near mould was 0.10～0.14 mm; the crystallization rate of CSP solidified flux film was 40% ~80%

and the crystallized mineralogical phases were cuspidine(3CaO ·2SiO₂ ·CaF₂)and mineralogical phase Na₂O · Al₂O₃ · SiO₂ .The thermal transformation shall be controlled by adjusting the thickness of solidified flux film and crystallization rate of cuspidine in the film to increase the surface quality of concasting slab