1963年我厂为了提高无缝钢低倍组织合格率,降低模子消耗及改善模子涂油时的工作条件,进行了模子不同涂料的试验。试验是在370～500吨位的固定式平炉炼出的钢进行的,执行优质钢操作规程,铁水及废钢配比为70:30,末期渣碱度大于2.3,CaO>40%,出钢槽小炉二槽、大炉三槽同时流入盛钢桶内,采用炉前脱氧,并在加入脱氧 In 1963 I plant in order to improve the pass rate of seamless steel microstructure, reduce mold consumption and improve the working conditions of the mold oiled, the mold of different coatings test. The tests were carried out on fixed open hearth furnaces of 370-500 tonnage. High quality steel practices were followed. The hot metal and scrap ratio was 70:30, the final slag basicity was greater than 2.3, CaO> 40%, and the tapping groove was small Furnace two tanks, furnace three tank at the same time into the steel bucket, the furnace deoxidation, and adding deoxidation