复吹转炉冶炼终点零位底吹搅拌工艺.pdfVIP

复吹转炉冶炼终点零位底吹搅拌工艺 张 越 田 勇 张志文 李 镇 温铁光 （鞍钢股份有限公司第三炼钢连轧厂，鞍山 114021 ） 摘 要 本文根据鞍钢第三炼钢连轧厂 260t 顶底复吹转炉的具体实际，利用数值模拟方法分析了冶炼终点零位底 吹搅拌工艺的可行性。在实际生产中，制定了零位底吹搅拌的工艺路线，并从碳氧积、出钢碳含量、磷含量和温度 变化等角度探讨了终点零位底吹搅拌的规律。结果表明，转炉终点零位底吹搅拌具有降低碳氧积，确保脱磷率等较 为明显的冶金效果。 关键词 顶底复吹转炉 零位底吹 氩气搅拌 Bottom-blowing Stir Process at Zero Position in End-point for Combined Blowing Converters Zhang Yue Tian Yong Zhang Zhiwen Li Zhen Wen Tieguang (No.3 Steelmaking Continuous Rolling Plant, Angang Steel Co., Ltd., Anshan, 114021) Abstract In this paper, based on the practical conditions of 260t combined blowing converters equipped in No.3 Steelmaking Continuous Rolling Plant, Angang Steel Co., Ltd., the feasibility of bottom-blowing stir process at zero position in end-point was analyzed via numerical simulation. In the production line of this plant, the procedure of bottom- blowing stir process at zero position in end-point was designed. The metallurgical characteristics of this process were summarized from product of carbon and oxygen, carbon and phosphor contents in molten steel and bath temperature etc. The results indicated that the bottom-blowing stir process had metallurgical effects of reducing product of carbon and oxygen and increasing dephosphorization rate. Key words combined blowing converter, bottom-blowing at zero position, argon stirring 1 引言 转炉的顶底复合吹炼技术能够促进化渣、充分搅拌熔池、提高渣金反应速度，尤其是吹炼低碳钢水时， 降碳速度快、终点炉渣中∑(FeO)低、避免熔池过度氧化的优点，因此已经广泛应用在现代转炉冶炼工艺中[1] 。 按照使用目的，复吹转炉大致可分为三种类型：(1)弱搅拌型复合吹炼：以提高产品质量为主，适合冶炼各 种钢种。(2)强搅拌型复合吹炼：以提高产量为主，较适合冶炼低碳钢。(3)强化冶炼、提高废钢比的复合吹 炼：适合于高废钢比的冶炼条件[2] 。 鞍钢第三炼钢连轧厂装备有公称容量为 260t 的顶底复吹转炉3 台，采用 N2/Ar 可切换底吹装置。自2006 年起，为了扩大钢铁产品品种范围、提高转炉冶炼控制水平，开展了扩展转炉底吹功能的一系列研究和测试 工作，尤其是根据冶炼时机的变化，调节底吹强度和搅拌能力