摘要
研究了低碳钢铸坯出现事故时以及调整保护渣化学成分后两种渣膜的显微结构,分析了事故原因,并提出通过控制固态渣膜的结构和结晶矿相来提高渣膜的润滑和传热性能,改善铸坯质量。低碳钢连铸保护渣应具有好的导热性和低的结晶率,所以应降低渣膜结晶率,增大玻璃化倾向,并且要避免钾钠长石、斜长石、霞石、枪晶石等高熔点矿物析出,从润滑性和导热性统一优化考虑,出现硅灰石、黄长石是比较好的。加入B2O3和LiO2后,渣膜中晶体尺寸减小,玻璃化倾向增大,使铸坯质量明显改善。
The microstructures of accidental film and adjusted film for low- carbon steel have been studied, accidental reasons have been analysed , and the way is point out to improve performance of lubricity and heat conductivity of casting powder and quality of slab by controlling the solidified film structure and mineralogical phase. Casting powder for low - carbon steel should possess good heat conductivity and low crystal rate. so, It is necessary to decrease crystal rate and increase glassy tendency of film, and avoid forming some mineral like K - Na - feldspar, Plagioclase, nephelite, cuspidine in solidfied film. All things considered, especially lubricity and heat conductivity, wollastonite, melilite in solidfied film are good. After adding B2O3 and LiO2, crystal size was decreased, glassy tendency was increased, and the quality of slab was improved obviously.
出处
《钢铁钒钛》
CAS
2008年第2期32-36,共5页
Iron Steel Vanadium Titanium
关键词
低碳钢
连铸
保护渣
固态渣膜
显微结构
结晶矿相
low - carbon steel
continuous casting
casting powder
solidified film
microstmcture
mineralogical phase
