38CrMoAl钢浸入式水口结瘤机理研究

Research on clogging mechanism of tundish submerged nozzle for 38CrMoAl steel

通过对高铝钢38CrMoAl连铸方坯生产过程中钙处理前后水口结瘤物的物相测定和钢中夹杂物的类型分析,研究高铝钢中间包浸入式水口处结瘤机理。分析结果显示,Al_2O_3、MgO·Al_2O_3和CaS是堵塞中间包水口的主要物质,水口堵塞的原因是钢液中的高熔点夹杂物在水口内壁聚集、粘结。钢中较高的S含量、精炼渣系控制不当、钙处理过度是引起水口堵塞的主要原因。针对上述原因,结合实际生产提出了高铝钢水口结瘤改进措施。

By phase analysis of the clog of nozzle and type analysis of inclusion in 38CrMoAl steel,the effects of calcium treatment factor on nizzle scabbiness was analyzed and the mechanisms of clogging were discussed. The results indicated that the clogs of nozzle consist of Al2O3,MgO·Al2O3,CaS and calcium aluminate mixture,because of the inclusion in molten steel with high melting point aggregating in nozzle inner wall. Clogging has caused by high sulfur content of steel liquid,irrelevant refining slag system and excessive calcium treatment. The nuzzle clogging was analyzed and some measures were put forward.