摘要
连铸过程中为防止二次氧化的发生,常采用保护浇注措施,一般在水口处通入氩气进行密封,隔绝高温钢液与空气的接触。某钢厂连铸水口处,采用原有保护气管道中通入纯度为99.9%的CO2代替Ar作为保护气体,并对保护浇注前后钢中的氧、氮元素含量和夹杂物进行分析,试验表明:与常规Ar保护相比,CO2保护浇注不会导致二次氧化的加剧,保护效果与Ar相同,同时对夹杂物及大型夹杂物的形貌、组成没有影响,并且大型夹杂物平均质量减少了16.6%。故对于氧含量要求不特别严格的钢种,CO2可代替Ar应用于连铸而达到保护浇注的目的。
In order to prevent reoxidation from occurring during the continuous casting process, the measures of protective casting are usually used, one of which is shielding the immersion nozzle with Ar form the contact between molten steel and air. CO2 with the purity of 99.9% was used as shielding gas by the original shielding gas pipeline instead of Ar in the continuous casting nozzle through comparing the content of O and N before and after the protective casting and analyzing the inclusions. The research showed that comparing with the conventional process of Ar, it wouldn＇t lead to the intensification of reoxidation and had the same protective effect by using CO2 as shielding gas. And the description and constitution of inclusions was almost same in the two shielding gas process conditions. In addition, the average quality of large inclusions decreased by 16.6%. So except the steel grades with particularly stringent requirement of O content like bearing steel, CO2 could complete the risk of protection casting in continuous casting process instead of Ar.
出处
《连铸》
2015年第2期5-9,共5页
Continuous Casting
基金
国家自然科学基金资助项目(51334001)
国家科技支撑项目(2012BAC27B01)
