转炉底吹全程吹氮工艺条件下螺纹钢质量及性能

Quality and Complex Performance of Deformed Steel Bars by the Whole Process Bottom Blowing Nitrogen of BOF

借鉴前人研究成果并结合生产实际对复合吹炼转炉底吹全程吹氮工艺螺纹钢质量及性能进行了系统研究。综合对比采用全程吹氮和氮氩切换方式(Ⅰ模式和Ⅱ模式两种不同供气参数)对冶炼、浇铸各个时期钢中氮氧含量、铸坯、轧材内在质量及轧材综合性能差异。结果表明,采用全程吹氮方式与氮氩切换方式钢中氮含量、轧材的夹杂物总量、金相组织的级别、屈服、抗拉强度和断后伸长率都无明显区别,但在同种供气方式上,不同的供气参数对上述结果却有一定的影响。在研究过程中同时研究了时效对轧材综合性能的影响。

Base on the research results of literatures and production condition of BOF,the influences of the smelting process by whole process bottom blowing nitrogen on the quality and complex performance of rolled metal were systematically investigated in the combined blown converter.Through adopting the process of whole process bottom blowing nitrogen and the change-over from nitrogen to Ar（including Ⅰand Ⅱmode）,the nitrogen and oxygen content in steel during the refining,casting,the casting blank and rolled metal quality and the complex performance of rolled metal were studied.The results show that the nitrogen content,the inclusion and metallurgical structure grades,the yield strength,tensile strength and percentage elongation after fracture of rolled metal produced by whole process bottom blowing nitrogen and the change-over from nitrogen to Ar have no distinctly difference.However,for same supply gas mode,different supply parameters,there are certain influences on above results.Meanwhile the influence factors of ageing on complex performance of rolled metal were studied.