【作者】 刘著；

【导师】 唐萍；

【作者基本信息】 重庆大学 ， 冶金工程， 2006， 硕士

【摘要】 我国拥有极为丰富的稀土资源,已在许多领域得到应用,尤其在钢中应用最为突出。大量研究和生产实践表明,稀土元素在钢中具有净化钢质、变性夹杂和微合金化的作用,这不仅使钢的塑韧性提高,还大大改善了钢材的冷冲压成型性能和耐蚀性能。CSP薄板坯连铸连轧生产工艺,由于结晶器为漏斗型,变形大,并且薄,裂纹敏感性强的钢种生产困难,生产品种单一,因此,在钢中加入稀土,开发附加值高的产品是国内CSP生产线的首要任务之一。但在薄板坯连铸结晶器中喂入稀土难度很大,既要保证加入稀土后连铸工艺的顺行(不漏钢),还要保证准确、均匀的控制稀土加入量,加入速度,保证高拉速下稀土在铸坯中分布的均匀性,收得率。薄板坯连铸连轧工艺稀土钢的生产目前在国内是空白,在国外的文献中也未见报道。本文采用物理模拟的研究方法,依据珠钢CSP薄板坯连铸结晶器工艺参数:断面1380×60 mm~2;拉速4.0～6.0m/min。通过对不同拉速、不同喂丝位置下的流场、浓度场、示踪剂响应时间、保护渣覆盖结果以及稀土氧化放热对凝固坯壳的影响进行分析,确定了稀土丝合适的喂入位置、喂入速度和直径。为了保证稀土丝加入结晶器后连铸工艺的顺行(不漏钢),并保证连铸工艺要求的铸坯质量,本文还通过大量的实验,分析了稀土及其氧化物对薄板坯连铸结晶器保护渣理化性能的影响规律,研制出了适合于薄板坯连铸稀土钢生产的保护渣的配渣原则。本课题为开发薄板坯连铸连轧稀土钢生产工艺进行了实验室的基础研究,为工业上大批量生产稀土钢提供了技术支持和保证。更多还原

【Abstract】 Our country has the extremely rich rare earth resources, obtained the application in many domains, especially applies in the steel prominently. The massive research and the production practice indicated that, the rare-earth element has the purification steel, the denatured mixture and the micro alloy function in the steel, this not only causes the steel to model toughness and plasticity to enhance, but also greatly improved the steel products cold ramming to take shape the performance and resists corrosion the performance. Thin slab continuous casting of Compact Strip Production , as a result of the mould for the funnel, distorts in a big way, and thin, the crack sensitivity strong aluminum production difficulty, the production variety is unitary, therefore, joins the rare earth in the steel, the development attachment value high product is one of domestic CSP production line most important tasks. But it is very difficult to feed into the rare earth in the mould, not only must make the production proceed succeed after feed into rare earth (avoid breakout), but also must guarantee well and truly control the wire-feeding quantity and speed, must guarantee the uniformity which rare earth distributes in the slab and rare earth yield rate under the high casting speed, receives rate. The thin slab continuous casting production for rare earth steel is a blank in domestic at present, has not seen the report in the overseas paper.The physical simulation method was widely taken to research the rule of flow pattern. In the dissertation, according to the technical parameters (1380×60 mm~2, bloom section, 4.0～6.0m/min,casting speed) for mould of thin slab continuous casting in Zhujiang Iron & Steel Group Co. The flow field, density field, response time, covering of flux and the influence of heat release when rare earth oxidizing on the solid slab were investigated under the different casting speed and wire-feeding positions, the optimum wire-feeding position and speed have been determined, and the diameter of rare earth wire has been suggested also.In order to make the production proceed succeed after feed into rare earth (avoid breakout) and guarantee the product quality of thin slab, this article has analyzed the effect of rare earth and its the oxide compound on physical-chemistry properties of mould fluxes through the massive experiments, the production rule of mould fluxes suit for rare earth steel has been developed.更多还原