【作者】 杨秀；

【导师】 章奉山；

【作者基本信息】 武汉科技大学 ， 钢铁冶金， 2004， 硕士

【摘要】 随着科学技术的不断进步，超低碳冷轧薄板([C]≤30×10^-6)广泛应用于汽车、家电、电子领域。众所周知，固溶碳严重影响了钢的深冲性能，为了得到表面质量和加工性能良好的冷轧薄板钢，必须降低钢中固溶碳含量。为了满足市场对冷轧薄板钢需求量的不断增加和连续退火工艺要求，超低碳钢生产也在不断增加。 超低碳钢的需求量越来越大，确定一种有效的精炼脱碳工艺变得极为重要。传统的RH（真空循环脱气法）是仅以未脱氧钢中含氧量来真空脱碳的冶炼方法，带来了转炉出钢温度高、真空精炼时间长、产品缺陷比率高等问题。RH-KTB（真空顶吹氧脱碳技术）的出现将传统的RH脱碳技术推向了一个新的阶段。RH-KTB是利用水冷氧枪向真空室内的钢液面吹氧，这样可以方便的从反应系外供给真空脱碳所需的氧。不仅促使了高碳钢水的脱碳反应，而且由于在真空室内发生的CO气体的二次燃烧反应放热，可以补偿钢液温度的损失。大大地降低了制造成本，稳定地提高了产品质量。 武钢是国内应用RH-KTB生产超低碳钢的厂家之一。但在实际生产中，要想稳定快速地将碳脱至超低碳含量范围并非易事。通过对RH-KTB脱碳反应机理及速率方程的综合研究，分析讨论了初始碳含量、顶吹氧、真空度、循环流量、供氧参数 等因素对RH-KTB脱碳速率的影响，为武钢二炼钢提供了利用RH-KTB生产超低碳钢工艺。通过了三轮的现场试验，在RH-KTB精炼结束后，钢中碳含量均能控制在15×10^-6以内。试验结果表明，采用本实验工艺生产超低碳钢取得了预定的效果。更多还原

【Abstract】 With the development of science and technology, the ultra-low carbon cold rolled steel sheets(with a carbon content of less than 30 10-6) have been thoroughly used in automobile and home electric appliance industries. It is well know that the carbon content of steel has significant effect on the deep punching properties of steel that is an important index for this steel grade. To meet uninterruptedly increasing in the demand for the cold rolled steel sheets and to meet the technological demand of continuous annealing, the production of ultra-low carbon steel is increasing.With the increased demand for ultra-low carbon steel, it becomes essential to establish an effective refining process. The conventional RH(Ruhrstahl-Heraeus) processes which has been applied to produce ultra-low carbon steel occurs many problems, such as high temperature of molten steel, long time of refining in RH, high rate of inferior product. The exploitation of RH-KTB(Ruhrstahl-Heraeus-Kawasaki top blowing) processes promote progress of RH.In the RH-KTB process developed to manufacture low and ultra-low carbon steel, oxygen gas is blown onto the molten steel surface through a top lance from the top of the vacuum vessel. RH-KTB which is enabled to increase the decarburization rate, as well as raise the temperature of molten steel and adjust the composition and others from simply degassing,WISCO is one of the internal main steel companies which produce ultra-low carbon with RH-KTB processes. But in practice, it is not easy to product steadily ultra-low carbon steel.By generally study decarburization reaction mechanism and the rate equation of the decarburization reaction, analysis effect of factors on the decarburization. These factors include initial composition of liquid steel, pressure in the chamber, circulation rate of the molten steel, lifting Ar gas flowrate, inner diameter of the snorkel and the other operating factors.We provide technics on producing ultra-low carbon steel utilizing RH-KTB to WISCO. The results of three times trial indicate that the carbon content of steel can be less than 15 10-6 after refining. Scheduled purpose is reached, which proves the technics is viable.更多还原