Operating condition and service results of several tested bricks in slagline area of the VOD vessel are described,It has been shown that the fully co-clinkered magnesite chrome brikc is superior,followed by two-stage calcined magnesite-dolominte brick,preracted magnesite-chrome brick and one-stage calcined moagnesite-dolomite brick. Chemical and petrologial examination were carried out by conventional analysis and optical microscope respectively,The reason of damage of the tested bricks are discussed and described as follows:(1) MgO in brick is erosed and dissolved by slag to destroy structure of the direct bond;(2)slag penctrating into the brick and then reacting with it to from various belts leading to spalling;(3)reducing action of reucing agents;(4) vaporiztion of some composition in the brick at high temperature under vacuum causes reducing weight and increasing porosity and (5) serious machanic abrasion.Therefore,Some opinions on increasing lining life of VOD vessels are suggested.
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