摘要
控制LD(氧气顶吹转炉)吹炼终点C-低碳钢0.08%~0.10%C、中碳钢0.10%~0.15%C、高碳钢≥0.20%c;通过LD出钢时强化预脱氧,控制出渣钢下渣率达98%,控制LF精炼Als为0.020%~0.035%,保证精炼渣中(FeO)≤0.5%,喂CaSi线,50~80L/min软吹氩时间≥7min以及全程保护浇注;中间包采用高效保温吸渣剂及稳定连铸操作等工艺措施,使石钢55t转炉-60tLF冶炼流程在不进行真空处理的工艺条件下,连铸坯中氧含量控制在20×10^-6以下。
The oxygen contem in concasting billet has been controlled less than 20 ×10^-6 in condition of non-vacuum treatment with 55 t LD-60 t LF melting flow sheet at Shijiazhuang Iron and Steel by the operation measures such as control- ling LD blowing end-point carbon: low carbon steel 0.08%~0.10%C; medium carbon steel 0.10% ~ 0.15%C and high carbon steel ≥0.20%C, strengthening pre-deoxidation at steel tapping of LD, controlling slag tapping rate up to 98%, controlling Als 0.020% ~ 0.035% during LF refining, to ensure refining (FeO) ≤0.5%, feeding CaSi wire, 50 ~80 L/ min soft blowing argon time ≥ 7min, protective casting in whole process, using high efficiency holding and absorbing slag agent, and constant casting operation.
出处
《特殊钢》
北大核心
2006年第1期48-50,共3页
Special Steel