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| 1 | 高速连铸用新型浸入式水口显示文摘连铸机结晶器内钢液的流动状态严重影响连铸坯的质量,尤其在弯月面处,钢液与结晶器保护渣直接接触,结晶器内弯月面不稳定引起的卷渣,是导致产品产生缺陷的主要原因之一,如冷轧薄板的线状缺陷和厚板的表面缺陷。在结晶器润滑不均匀时,还会增加漏钢危险。弯月面液面波动主要是由于浸入式水口吐出孔钢液剧烈的湍流和瞬态行为引起的。最近,在一台连铸机上浇注不同钢种已成为全世界钢铁生产商努力的一个主要方向。为了满足所有钢种的质量要求,对每个钢种都要求一定的浇注速度。对常规的浸入式水口而言,确保结晶器内有利的流动条件是一个难题。因此,比以往更需要一种新型浸入式水口,通过保持最佳的结晶器内钢液流动状态,以各种浇注速度浇注出多规格铸坯。介绍了测试新型浸入式水口流动性能的数值模型和物理模型的试验。采用URANS方法瞬态CFD模拟表明,新型浸入式水口流出的钢液瞬态行为稳定,因而弯月面以下钢液流速较慢,其效果还通过水模拟得到了验证。现场试验是在中国台湾的中钢公司进行的,试验结果表明,通过优化结晶器内钢液的流动行为,结晶器液面波动明显减小,从而提高了产品质量。 | Shung Sheng Kao Hsin Chin Kua Oliver Wiens Wolfgang Mo?ner Markus Reifferscheid Nobert Vogl Gernot Hackl Gerald Nitzl 潘秀兰 | 2014 | 世界钢铁2014，，1： | 2 |
| 2 | Novel Stopper Designs to Improve Argon Purging Efficiency in Slab Casting显示文摘In order to ensure consistent argon flow in the stopper gas channel and improve argon bubble performance in the slab casting mould,two patented new technologies CSC(Clean Stream Cartridge) and SHP(Slot Hole Plug) were applied in the argon purging stopper designs.The novel stopper designs can maintain a stable back pressure and argon flow in the argon line during long sequence casting,eliminate pressure increasing at the start of the casting,even distribute gas bubbles in the mould leading to improved mould flux melting and lubrication,reduce mould level fluctuation and so on. | Yong TANG Gerald NITZL Gernot HACKL | 2016 | China's Refractories2016，25，4： | 1 |
| 3 | Norton-Hoff model for deformation of growing solid shell of thin slab casting in funnel-shape mold显示文摘A funnel-type mold is commonly used to provide necessary clearance for the submerged entry nozzle in the thin slab casting(TSC).The partially solidified shell is subjected to the mechanical deformations,which can lead to the defects formation and,as a results,to a breakout.Traditionally,the results of the flow simulation,performed by the finite volume method(FVM),are fed to the external package for the finite element analysis of stress and strain.A coupled model was assembled using“creeping solid”approach by blending the Norton-Hoff viscoplastic stress for the solidifying shell with the Newtonian viscous stress of the liquid melt.The FVM was used to combine both liquid and solid stress models within a single solver.The iterative procedure based on the improved both side diffusion method was introduced to treat the nonlinear relation between the viscoplastic stress and the strain rate.The modeled shell thickness was verified by previously published breakout measurements and the simulation results.Temperature distribution,obtained during the TSC simulation,dominantly corresponds to the viscoplastic range.Developed numerical approach is robust and has direct industrial application. | Alexander Vakhrushev Abdellah Kharicha Menghuai Wu Andreas Ludwig Gerald Nitzl Yong Tang Gernot Hackl Josef Watzinger Christian M.G.Rodrigues | 2022 | Journal of Iron and Steel Research(International)2022，29，1： | 0 |
| 4 | Steel Quality Improvement Potentials in the Continuous Casting Process Using State of the Art Refractory Flow Control Systems显示文摘In the continuous casting process for high quality steel grades, activities are mainly focused on avoiding reoxidation and promoting non-metallic inclusion removal during steel transfer from the ladle through the tundish to the mould. In this paper, methods to effectively control flow from the tundish to the continuous casting mould are described and specific state of the art refractory solutions are also introduced. | NITZL Gerald DETTELA Heiko DAI Peter | 2011 | Journal of Iron and Steel Research(International)2011，18，S2： | 0 |
| 5 | Refractory Tubes with Innovative Liner Technology for Flow Control and Clean Steel Applications显示文摘Ladle shrouds(LS)and submerged entry nozzles(SEN)are flow control products used in continuous casting which transfer the liquid steel from the ladle to the tundish and further to the mould.Due to the strongly different and quickly changing temperature conditions before and during steel casting,highly thermal shock resistant refractory materials are required which simultaneously save steel process energy.A new technology embeds a special liner into the refractory body inner surface to reduce the heat transfer through the LS/SEN wall.To better understand the function of this insulation layer a mathematical model was applied.Temperature measurements carried out in the steel plant were compared with the simulation results.The research results indicate potential heat loss reduction and performance improvements in the steelmaking process. | Patrick SEITZ Yong TANG Gerald NITZL | 2021 | China's Refractories2021，30，2： | 0 |
| 6 | New Argon Stopper Technology for Slab Casting显示文摘Argon addition into the casting channel reduces the amount of clogging on the refractory wall to allow long sequence casting of aluminium-killed steel grades.The key to minimum surface defects on the final product is to establish the optimum quantity by optimising the gas distribution below the stopper nose.This is achieved by new argon stopper technology which supports low gas quantities with homogeneous gas and bubble distributions to float non-metallic inclusions(NMI)in the continuous casting mould. | Gerald NITZL Xiaohui LIU Qingxin LIU Jie SHEN Yong TANG | 2021 | China's Refractories2021，30，2： | 0 |
| 7 | An Innovative Submerged Entry Nozzle Design for Billet and Bloom Casting显示文摘Fluid flow in the mold has a significant impact on the quality of continuously cast steel products.Since it is strongly influenced by the SEN design,attention has to be paid on its geometry.In this paper the main principles of a novel SEN type will be described.Water modeling and Computational Fluid Dynamics(CFD)are applied to characterize the flow pattern under different conditions.Furthermore,the interaction with electromagnetic stirring(M-EMS)is analyzed by means of a liquid melt model.Finally,actual steel plant performance data and observations are discussed. | Gernot HACKL Yong TANG Gerald NITZL Dennis SCHURMANN Bernd WILLERS Sven ECKERT | 2021 | China's Refractories2021，30，2： | 0 |
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