摘要
采用先进的测试技术,并结合现场生产试验,查清了连铸坯产生夹渣的主要原因是浸入式水口穿裂、插入深度浅、结晶器电磁搅拌强度过大,造成结晶器卷渣.其次是钢包下渣卷入钢水中,钢中氢含量高与大颗粒夹杂形成渣气孔,钙处理加入Si-Ca量大,钙侵蚀耐火材料形成mCaO·nAl2O3未上浮留在钢中.为此,采用提高耐火材料质量及合理烘烤制度,降低结晶器搅拌电流,增加浸入式水口插入深度≥120 mm,提高钢的纯净度,降低氢含量,钙处理加入Si-Ca量控制在0.25～0.35 kg/t,使合金结构钢连铸坯低倍夹渣完全消除,确保了合金结构钢铸坯的内部质量.
The main reasons of slag entrapment in structural alloy steel obtained with advanced measuring technique and on the spot are un-favorite flow field in mould caused by submerged nozzle cracking, short submerged depth of submerged nozzle, over stirring of M EMS （Mould Electromagnetic Stirring）, then the others are slag carry over from ladle, high content of hydrogen in the molten steel, mCaO · nAl2O3 are formed due to corrosion of stopper head and nozzle by Ca from Ca-Si for modification. So the stirring power of the M-EMS was reduced, submerged depth of the submerged nozzle was increased （≥120 mm）, the amount of hydrogen in the molten steel was reduced, the amount of Si-Ca for Ca treatment is controlled in a range of 0.25-0.35 kg/t. And finally, the high quality structural alloy steel billets can be produced with high yield.
出处
《钢铁》
CAS
CSCD
北大核心
2006年第4期33-35,61,共4页
Iron and Steel
关键词
连铸
合金结构钢
夹渣
continuous casting
structural alloy steel
slag inclusion
