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采用扫描电镜,大样电解法和金相法对宝钢连铸坯中夹杂物进行了调查,对夹杂物数量,类型,组成及分布等进行了讨论,为提高铸坯净度提供了依据。 相似文献
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采用扫描电镜,大样电解法和金相沉淀宝钢铸坯中夹杂物进行了调查,对夹杂物数量,类别型,组成及分布等进行了讨论,为提高铸坯纯净提供了依据。 相似文献
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Brian G. Thomas Quan Yuan Sana Mahmood Rui Liu Rajneesh Chaudhary 《Metallurgical and Materials Transactions B》2014,45(1):22-35
A particle-capture model based on local force balances has been developed, implemented into computational models of turbulent fluid flow and particle transport, and applied to simulate the entrapment of slag inclusions and bubbles during the continuous casting of steel slabs. Turbulent flow of molten steel is computed in the nozzle and mold using transient computational fluid flow models, both with and without the effects of argon gas injection. Next, the transport and capture of many particles are simulated using a Lagrangian approach. Particles touching the dendritic interface may be pushed away, dragged away by the transverse flow, or captured into the solidifying shell according to the results of a local balance of ten different forces. This criterion was validated by reproducing experimental results in two different systems. The implications of this criterion are discussed quantitatively. Finally, the fluid flow/particle transport model results and capture criterion are applied together to predict the entrapment distributions of different sized particles in a typical slab caster. More large particles are safely removed than small ones, but the entrapment rate into the solidifying shell as defects is still very high. 相似文献
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以济钢连铸混浇坯为研究对象,通过对大量实验数据进行分析和对比,摸索出碳、锰和微合金元素等主要成分在60t中间包异钢中混浇过程中的变化规律,为异钢种混浇坯的判定提供了可靠的理论依据及实践指导。 相似文献
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连铸中间包钢水的清洁度 总被引:2,自引:0,他引:2
针对宝山钢铁(集团)公司60t中间包,通过系统取样,研究了钢水流动控制、覆盖剂、内衬材质及保护浇注对中间包钢水清洁度的影响。结果表明,在中间包适当位置使用挡墙、坝和过滤器有利于促进夹杂物的去除;使用高碱度、低SiO2的覆盖剂及MgO-CaO质内衬有利于改善钢水的清洁度;长水口保护浇注可使钢水中吸氮量降至(3~5)×10-4%。同时,运用K—ε双方程模型计算了中间包三维流场,从数学模型上分析了中间包流动控制装置对去除夹杂物的影响,为进一步提高中间包钢水清洁度提供了依据。 相似文献
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下塔吉尔钢铁公司从1997年开始用含钒生铁冶炼的连铸坯来轧制钢轨.生产过程是经真空处理后钢水在结晶器断面为300mm×360mm的弧形连铸机上进行浇铸. 铸坯的表面质量取决于一系列的工艺参数:保护渣的成分(保护渣的粘度、熔化和凝固温度、熔化的速度);结晶器的振动参数;水口的浸入深度;以及上述参数能否得到严格的保证. 相似文献
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Theoretical Model of Steel Continuous Casting Technology 总被引:1,自引:0,他引:1
A theoretical model adapted for studying steel continuous casting technology was proposed. The model based on system theory contained input/output, command, and control parameters. The process was divided into five stages, ie, tundish, mold, guiding system, guiding drawing system, and guiding drawing soft reduction system. The model can be used to describe the physicochemical processes, thermal processes, chemical processes, and characteristics of the cast material according to the above mentioned stages. It can also be applied to other metallurgical technologies and even to other industries (chemistry, food, etc). 相似文献