Nozzle Clogging Behaviour of Ti-bearing Al-killed Ultra Low Carbon Steel
Nozzle Clogging Behaviour of Ti-bearing Al-killed Ultra Low Carbon Steel
复制标题
DOI：
10.2355/isijinternational.44.1653
复制
发表时间：
2004-10
影响因子：
1.8
通讯作者：
S. Basu;S. Choudhary;N. Girase
中科院分区：
文献类型：
--
作者：
S. Basu;S. Choudhary;N. Girase
本文研究了钛对铝渗超低碳（ULC）钢浇注性能的影响，并探讨了含钛超低碳钢相对于无钛钢浇注性能差的可能原因。本工作还试图确定在含钛铝压ULC钢连铸过程中防止浸没入口喷嘴（SEN）中夹杂物沉积的适当对策。研究了浸没式入口喷嘴沉积物以及相应的RH脱气器和中间包钢液和渣样中的夹杂物特征。少量含钛氧化铝夹杂物的存在是导致SEN矿床内部大量熔体冻结和含钛铝压ULC钢浇注性差的原因。从化学成分出发，评估了RH脱气后与钢液接触的所有材料对钢液再氧化行为和浇注性能的影响。本研究表明，虽然再氧化对所有al -kill钢的浇注性能都是不利的，但对含ti的al -kill钢来说，情况变得更糟，这主要是由于含ti夹杂物的形成促进了喷嘴沉积物内部大规模的熔体冻结。
In the present work, attempt has been made to investigate the influence of Ti on the castability of Al-killed ultra low carbon (ULC) steel, and to establish the possible reasons for the inferior castability of the Ti-bearing ULC steel vis-a-vis Ti-free grades. The work also attempted to identify suitable counter-measures for prevention of inclusion deposition in the submerged entry nozzles (SEN) during continuous casting of Ti-bearing Al-killed ULC steels. Characteristics of inclusions in the submerged entry nozzle deposit and corresponding liquid steel and slag samples from RH degasser and tundish were investigated. The presence of small quantity of Ti-bearing alumina inclusion was identified to be responsible for the extensive melt freezing inside the SEN deposit and poor castability of Ti-bearing Al-killed ULC steels. The influence of all materials contacting liquid steel subsequent to the RH degassing, on the reoxidation behaviour and castability of liquid steel, was assessed from their chemical composition. The present investigation indicated that while reoxidation is bad for the castability of all Al-killed steels, it becomes worse in the case of Ti-bearing Al-killed steels, primarily due to the formation of Ti-bearing inclusions that promote large-scale melt freezing inside the nozzle deposits.