线材水冷过程优化控制模型

在分析了钢坯出炉后热过程特点的基础上 ,建立了线材控冷轧制热过程数学模型 ,提出了“前馈+反馈”的温度控制方式。实际运行结果表明 :该控制方式能够合理地控制水箱水流量 ,从而确保线材水箱出口处的温度满足工艺要求 ,大大提高线材成品的质量。     

前馈与反馈相结合的控制策略在宝钢线材厂的应用

以宝钢线材厂线材轧制全过程为研究对象,在详细分析了线材控轧控冷热过程特点的基础上,提出了前馈与反馈相结合的水箱水量优化控制策略.实际控制效果表明:该策略能够合理地控制各水箱流量,保证了线材在各水箱出口处的温度满足工艺要求,显著提高了线材成品质量.所做工作对国内外同类生产线具有重要的指导意义.     

降低高速线材轧机控冷水箱故障的方法

介绍了湘钢华光线材有限公司高速线材轧机控冷水箱系统故障的几种解决方法。     

φ13mm高碳线材控冷工艺实践

介绍了大直径高碳钢线材控冷机理，并对冷却风机，辊道速度，水箱等控冷参数设计做了较为详细的论述。     

高速线材轧件不冷段长度失调问题的解决

通过监测现场水箱控制系统的相关数据,对高线水箱控制中出现的线材不冷段长度失调等问题进行研究分析,实施水箱温控系统水冷模式的软硬件调整,达到轧件水冷的精确控制。     

装有精密控制系统的钢材生产线

英国一家钢厂安装了1套有精密控制系统的钢材生产线,生产棒材及具有微合金钢特性的热卷线材。该生产线包括9台粗轧机架、3台剪切机、6台中间机架、10机架连轧机组、快速冷却水箱、散卷装置、传送装置、矫直机及用于捆扎成品的打包机。尺寸为12.4ｍ×0.13ｍ×0.13ｍ的钢坯以40ｔ/ｈ的速度推入燃气加热炉加热至1020℃,每隔90ｓ将1根钢坯喂入粗轧机架。轧制过程用红外高温计首先测定粗轧机架中钢坯温度,然后测定棒、线材进入水箱前的温度。为了随意控制冷却速度,在前两个水箱后面装有附加夹送辊,通过保持线材张力控制冷却过程中水流速度。主控…     

天钢高速线材轧机水箱冷却系统的控制

天钢集团高速线材厂于１９９１年引进美国摩根９０年代的高速线材轧机，它的热处理过程主要包括水冷和风冷。文章介绍了水冷控制的关键部分：水箱冷却系统。     

管桩钢用线材的开发要点

对管桩、管桩钢筋，管桩钢用线材作了介绍，分析了管桩钢筋的材料特性，阐述了开发管桩钢筋用线材的技术要求；钢种选择，成分设计与控制等。并提出了该品种线材的冶炼、轧制工艺要点 。     

天钢二高线水箱中水嘴的优化及应用

天钢二号高速线材轧机,在轧制Φ8.0 mm及Φ10.0 mm的螺纹钢时经常出现堆钢及冷却效果不佳的问题,通过观察和分析发现问题主要发生在2号至5号水箱及恢复段导槽。本文分析和阐述了问题发生的原因,制定了整改措施,通过现场对比实验,确定了水箱冷却水嘴及恢复段导槽的孔径由Φ12.0 mm扩大至Φ16.0 mm。优化后,基本消除了堆钢问题,改善了冷却效果,达到了预期的效果。     

轧制棒线材的无头轧制设备

日本钢管公司从东京钢铁公司获得了为该公司的高松厂制造圆坯轧制棒线材的无头轧制设备的订单，在世界上首次成功地将钢坯无头轧制设备实用化。该设备于１９９８年３月正式投入生产。该设备是通过对从连铸机（ＣＣＭ）直接送来的热钢坯在送往轧途中进行在连续焊接后，采用所为的“无头轧制技术”轧制棒线材的。本文以该设备为例，介绍了日本钢管公司开发的棒线材无头轧制设备的概况。     

连铸中间包技术改造与多孔控流挡墙的优化设计

介绍了连铸中间包由对称四流向非对称五流的技术改造，并采用数值模拟和水力学模拟的方法优化得出控流挡墙的设计方案。投产实践证明，控流挡墙能够明显改善中间包内钢液的流动特性，同时增加了产量、提高了钢坯质量。     

Application of Feedforward and Feedback Control Strategy for Wire Rod Hot Rolling Line

The control of rolled steel plate temperatureplays a crucial role in the wire production.Theprocess of wire production at Baosteel Co is shownin Fig.1.Cooling in water box directly affects thetemperature and then the quality and yield of wire,soit is an i…     

Modelling steel flow in a three‐strand billet tundish using a turbulence inhibitor

A three‐strand tundish belonging to a billet caster was water modelled and plant trials were performed to compare the performance of a pouring box and a turbulence inhibitor in terms of melt flow parameters and steel cleanliness. A tailor made turbulence inhibitor for this tundish is useful to accomplish with flow control of fluid turbulence and even melt redirection to all strands. The turbulence inhibitor helps to decrease nitrogen pickup during ladle changes and to float out inclusions towards the covering slag. As a consequence, rod operations to take of alumina deposits from nozzle walls are considerably decreased using a turbulence inhibitor.     

基于目标钢温的加热炉在线动态优化控制

由于鄂城钢铁有限责任公司宽厚板厂步进式加热炉无法很好地适应钢种和实际生产条件的变化,因此造成钢坯出炉温度无法精确满足轧线的要求。针对该问题,本文建立了步进式板坯加热炉数学模型,通过优化计算得到钢坯的理想升温曲线和相应的炉温制度,提出了基于各段目标钢温的在线炉温动态优化控制策略,建立了带有钢温负反馈的在线优化控制系统,实现了对出炉钢温的精准控制,同时达到了一定的节能效果。在实际应用中使开轧温度的命中率提高了12个百分点,吨钢燃料消耗降低了10 m3。     

Dynamic Water Modeling and Application of Billet Continuous Casting

The continuous casting process is used for solidifying molten steel into semi-finished steel.The technology of secondary cooling is extremely important for output of the casting machine and billet quality.A dynamic water model was introduced,including solidification model in the secondary cooling,feedforward control strategy based on continuous temperature measurement in tundish,and feedback control strategy based on surface temperature measurement.The mathematical model of solidification process was developed according to the principle of solidification,and the solidification model was validated by measuring billet shell thickness through shooting nail and sulfur print.Primary water distribution was calculated by the solidification model according to procedure parameters,and it was adjusted by the other two control strategies online.The model was applied on some caster and billet quality was obviously improved,indicating that the dynamic water model is better than conventional ones.     

连铸过程铸坯皮下裂纹的产生及控制

摘要：通过数值模拟的方法研究了典型大方坯（325mm×280mm）连铸过程中温度场和应力场分布,分析了铸坯皮下裂纹产生的原因和主要影响因素,制定了控制铸坯皮下裂纹的具体措施。结果表明：在连铸过程中铸坯的最大回温为121℃,二冷一区最高回热速率达到217.48℃/m,二冷二区最高回热速率达到131.95℃/m,其他各区回热速率都较低。温度回升后铸坯横断面距铸坯表面15~30mm处的最大应力应变值已经超过了钢的极限应力应变值,因此,二冷一区和二区温度回升是铸坯产生皮下裂纹的主要原因。增加二冷一区水量,将此水量在二冷三区和四区相应地减小,可以降低二冷一区回热速率,降低最大回热温度到88℃,控制铸坯皮下裂纹的产生。     

基于加热炉埋偶实验的GCr15钢坯心部温度预测

加热炉钢坯的心部温度均匀性控制对产品质量稳定性至关重要,由于加热炉中的高温环境,对钢坯心部温度高精度预测始终是一个难题。为了解决这个难题,本实验建立了一种基于钢坯埋偶黑匣子温度测量方法,有效获知加热炉内钢坯不同位置实际温度分布情况。基于黑匣子测温实验数据,采用数据清洗、数据平滑与标准化等预处理方法,采用基于数据驱动的神经网络、随机森林与XGBoost模型,利用加热炉中可测的炉气温度对不可测的钢坯心部的温度进行预测。预测GCr15钢150 mm×150 mm坯心部温度,结果表明：XGBoost模型回归预测效果最好,相对误差主要分布在0%～5.4%,模型中97.1%的样本点绝对误差小于10℃,其RMSE误差为4.1345℃,MAPE误差为0.47%。提出了钢坯埋偶黑匣子测温+XGBoost模型预测钢坯心部温度的方法。     

Design of single element flow control device in twin strand billet tundish for continuous casting of steel using flow simulation model

Abstract

An optimal single element flow control device (SEFCD) is proposed in the present study for a small capacity twin strand tundish, to produce steel billet with the desired cleanliness, designed by means of numerical experimentation. To achieve this goal, a mathematical model based on the SOLA-SURF technique and the k-? (where k is the kinetic energy of the fluid and ? is its dissipation) two equation turbulence model has been developed to simulate the fluid flow phenomena of molten steel, as well as the mass transfer phenomena of tracer during steady state operation in the tundish. The accuracy of the mathematical model has also been verified by water model experiments, which indicate that the mathematical model is sufficiently accurate and suitable as a tool to develop an optimal SEFCD as required in the present study. Several SEFCD designs have then been evaluated using the mathematical model. The simulated results show that a billet tundish with a high, long, trough shaped pouring pad arrangement has the highest residence time, which promotes inclusion removal, and is thus considered the optimal SEFCD design for the billet tundish.     

小方坯连铸机拉矫机驱动系统改造

介绍了宣钢二钢厂12流小方坯连铸机拉矫机驱动系统在生产过程中存在的问题.通过对设备损坏的原因分析,确定了输入轴做防水、对减速机新增1个高位油杯及降低工作环境温度的改造方案.实施后,提高了拉矫机驱动设备的使用寿命.