【摘要】 20钢（0.19%～0.23%C）Φ500 mm铸坯的生产流程为70 t转炉-LF-VD-Φ500 mm大圆坯连铸机从机械设备和二冷参数等方面进行研究和优化第1次生产试验连续浇铸8炉20钢,采用的优化工艺包括使用专用结晶器保护渣,控制过热度25～35℃,拉速0.30 m/min,比水量0.14 L/kg,结晶器电磁搅拌400 A/1.5 Hz等。检验结果表明,铸坯表面无可见冷疤、鼓肚等缺陷,中心缩孔0.5级,中心疏松1级,碳偏析≤1.12,钢中氧含量≤15×10^-6,氮含量≤65×10^-6,达到设计要求。更多还原

【Abstract】 The production flow sheet forΦ500 mm casting bloom of 0.20%C steel（0.19%～0.23%C） is 70 t BOF-LF-VD-Φ500 mm heavy round caster.The study and optimization work on mechanical equipment and process parameters including secondary water cooling parameter have been carried out.In first pilot production with continuous casting 8 heats of 0.20%C steel,the optimizing parameters including using special mold powder,controlling liquid overheating extent 25～35℃,casting speed 0.30 m/min,secondary water rate 0.14 L/kg,mold electromagnetic stirring 400 A/1.5 Hz are used.The examination results show that the bloom surface has not visible defects including bulging,feather defect;the rating of center line shrinkage is 0.5 and the rating of center porosity is 1,the carbon segregation is≤1.12,and the oxygen content in steel≤15×10^-6,nitrogen content in steel≤65×10^-6 to meet the requirement of design.更多还原