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Inverse Algorithm of Heat Transfer in Round Billet Continuous Casting Mould

YIN Hebi,YAO Man,

金属学报 , 2005,
Abstract: Based on the measured data of mould temperatures during continuous casting of round billet, an inverse problem model was developed. Through identifying the local thermal resistance and its distribution between the mould and the strand, the mould heat flux and the shell thickness profiles were calculated, and the relationship between them was also analyzed. The calculated results could preciously and correctly reflect the characteristics of non-uniform heat transfer around the mould circumference, which provided an applicable method for applying numerical simulation technique to monitor the solidification process and the "visual mould" technology in continuous casting.

GUO Liangliang,YAO Man,YIN Hebi,WANG Xudong,FANG Dacheng,LIU Xiao,YU Yan,

金属学报 , 2006,
Abstract: Based on the measured data of mould temperatures and heat flux, an inverse problem of mathematic model was developed to calculate the field of heat flux for continuous casting round billet. The characteristics of non-uniform longitudinal and circumferential heat fluxes were shown explicitly. The calculated formulae of longitudinal and circumferential heat fluxes were obtained by fitting the calculated heat flux with considering the effect of casting speeds and mould installation statuses and were compared with the published experiential formulae. The inverse problem simulation and the fitted heat flux formulae are helpful for visualization of mould process and analysis of heat flux and accident in continuous casting round billet.
Q420C角钢铸坯凝固传热分析及AlN析出控制 Analysis of billet solidification & heat transfer and AlN precipitation on Q420C angle steel  [PDF]
- , 2017,
Abstract: 为研究Q420C角钢在大矫直应变过程中的铸坯凝固传热行为以及Al N析出对铸坯和轧材质量的影响,本文通过Pro CAST模拟软件和射钉试验,对不同参数条件下铸坯表面和角部温度以及坯壳厚度等进行模拟计算,并提出了凝固坯壳厚度修正公式.通过Gleeble实验得出,铸坯在1008~1364℃温度范围内时具有较好的热塑性.对Al N析出的热力学和动力学研究表明,铸坯应避开在Al N析出"窗口"内矫直,轧制前加热炉均热温度控制在1160~1200℃,终轧温度控制在850℃以上可减少Al N在奥氏体晶界沉淀析出.经过工艺试验,成功开发出Q420C角钢,轧材平均合格率达到90%,综合性能指标满足要求.
单一尺寸圆坯的无缝钢管坯料设计模型与算法 Model and algorithm of the billet design problem in the production of seamless steel tubes with a single billet size  [PDF]
- , 2017,
Abstract: 无缝钢管坯料设计是在满足生产工艺要求下,将客户订单钢管合理地分配到生产原料圆坯的过程.实际生产中的批量原则使得每个钢管订单在圆坯中有最小分配重量要求;由于无缝钢管分配支数必须取整,导致钢管订单在圆坯中的分配重量并非连续取值.因此,比起相关的板坯设计问题和装箱问题,无缝钢管坯料设计的求解更为复杂.本文给出了无缝钢管坯料设计问题的一般性描述,并建立了混合整数规划模型.针对库存中只有单一尺寸圆坯的情况,简化了问题模型并且求得了问题的下界.结合问题特点,提出了基于贪婪策略的两阶段启发式算法,并用实际生产数据和仿真数据验证了算法求解此类问题具有很好的有效性和稳定性.
小方坯结晶器水温水速对传热过程影响 Influence of inlet cooling water temperature and velocity on billet mold heat transfer  [PDF]
- , 2015,
Abstract: 通过建立结晶器内钢液和水的二维对流-传热耦合模型过程,研究了小方坯结晶器冷却水入口温度和流速对铜管温度和结晶器内平均热流的影响.该模型使用Fluent进行求解,模拟了钢液和冷却水的流动和传热,凝固坯壳的生长,以及热量以辐射和导热两种通过保护渣和气隙.通过将坯壳厚度和铜管温度与其他研究的结果进行对比来验证模型准确性.研究结果表明,结晶器冷却水的温度显著影响铜管的冷面温度,水温超过313 K会导致铜管冷面最高温度超过水的沸点.水流速升高0.49 m·s-1能够消除水温升高4 K带来的不利影响.
Effect of Swirling Flow out of Nozzle on Flow Field in Continuous Casting of Billet

JIA Honghai,YU Zhan,LEI Zuosheng,DENG Kang,CHEN Jiachang,HUA Wenjie,REN Zhongming,
贾洪海 于
,,雷作胜,邓 康,陈家昶 华文杰 任忠鸣

金属学报 , 2008,
Abstract: Electromagnetic stirrer was fixed on intermediate zone of the nozzle to make molten steel outflow with swirling flow, reduce dashing depth of molten steel and form a up reversing flow. All of these were to get the mold powder melted, shell solidified and uniform composition in the continuous casting of special steel billet. This paper was to simulate the effect of electromagnetic stirring in submerged entry nozzle (SEN) through setting a swirl blade in SEN of the hydromechanics mode. This method used was to impart swirl to the flow. On the basic of this, the vertical velocity and horizon velocity of liquid level in the model were measured using Ultrasonic Doppler Velocity (UDV).The effectiveness of electromagnetic stirrer and analyzing technological parameter were examined. Following issues were obtained: (1) Swirling flow was in favor of flow field in mold. (2)The dashing depth can be reduced effectively. (3)The reversing flow and heat transmission of meniscus were enlarged. (4)The horizon circulating was formed so the activity of liquid level and the effectiveness of molten slag were increased.
逻辑与艺几  [PDF]
中外法学 , 2011,
Abstract: 法的精神即为法意,法意之司行即为流转。法意流转大别为逻辑演绎与类比推理两种风格迥异的模式。逻辑演绎主张以言敛意,在语言的地基之上以“方以智”的风格诠释法意流转,重“一”。类比推理强调言不尽意,以“圆而神”的风格艺几性地流转法意,尚“多”。方则易执,欠缺圆之神妙;圆则善变,差强方之智识。方圆互补是不通透的方智理路,立足于人性解放之上的自由变更才能真正实现法意流转的方圆无间之道。这正是法意流传的现象学解答
With Steel Billet Quality Upgrade Technology Research

王玉春, 郭达
Metallurgical Engineering (MEng) , 2014, DOI: 10.12677/MEng.2014.14012
In order to meet the requirements of high-end users, this paper, mainly researched the refining and continuous casting technology. The cold rolled steel billet line refining and casting process system was improved to improve the steel cleanliness, the slab quality, and exploit steel product market.
Recycling Billet Scales as Fine Aggregate in Concrete Production  [cached]
Akindahunsi A. A.,Ojo O
Civil Engineering Dimension , 2008,
Abstract: Billet scales are by-products from steel rolling mills in Nigeria that presently constitute environmental pollution. This paper reports studies carried out using these solid wastes as a partial replacement for sand in the production of concrete. Various percentages of billet scales were used in a concrete mixture of 1: 2: 4 by weight to cast concrete specimens. The compressive and tensile strengths developed were tested after 7, 14, 21, and 28 days of curing. The result of the compressive and splitting tensile strengths tests indicated that concrete strength increased with curing age. The compressive strength of 0%, and 15% replacement of sand with billet scales as obtained at 28 days are 26.0N/mm2, 26.2N/mm2. 15% optimal replacement of sand with billet scales had similar results as the control mixture of 0%, which could be used in reinforced concrete structures. Other replacements could be useful as mass concrete for non-structural construction applications.
Modeling of Heat Transfer and Solidification Process of Spray Formed Billet
Fuyang CAO,Chengsong CUI,Qingchun LI,

材料科学技术学报 , 2001,
Abstract: In this paper, modeling of heat transfer and solidification process of spray formed billet was established. Thermal profiles of billet at various spray time and under various spray forming conditions were calculated numerically. The simulation results are consistent with the actual experimental results.
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