热轧带钢粗轧区轧件温度场的数值模拟

为了优化轧制工艺和提高最终产品的质量，需要对轧件的温度场精确预测。通过对热轧带钢粗轧过程传热关系的分析，利用有限差分法建立了轧件三维温度场的数值计算模型。结合攀枝花钢铁集团公司热轧生产线的实际条件，利用该模型模拟了粗轧区轧件的温度场，并与实测结果进行了比较，验证了模型的可靠性。在此基础上，讨论了各种工艺因素对轧件温度场的影响，为改进和优化轧制工艺提供理论指导。     

低碳钢热连轧过程中工艺参数及组织演变的预测

采用二维有限元法对热连轧生产过程中沿带钢厚度方向的温度场分布进行了预测，建立了描述低碳钢软化行为的再结晶模型，并利用此模型对奥氏体再结晶动力学及微观组织演变进行了模拟计算，建立了计算精轧过程应力-应变曲线的流变应力模型，根据现场数据，对400MPa级超级钢细晶工业轧制实验的轧制力、轧制力矩和轧制功率进行了预测，结果与实测值吻合较好，反映了工业生产实际。     

热轧带钢粗轧区轧制宽展模型的研究

利用刚塑性有限元法建立带钢立轧／平轧的三维连轧模型，并针对宝钢2050热连轧机组实际轧制时各种工艺条件下的板带宽展进行了研究。根据研究所得的宽展规律，采用有限元分析与解析计算相结合的方法，建立了适合宝钢2050粗轧区带钢宽展计算的快速仿真模型。将该快速仿真系统运用于宝钢2050粗轧区实际模拟轧制几千块带钢，结果表明仿真计算结果与现场的实测值吻合很好。     

热轧带钢精轧过程中传热分析

通过对热轧带钢精轧过程中传热关系的分析，利用有限差分法建立了带钢精轧过程二维温度场的数值计算模型。结合唐钢热轧生产线的实际条件，对精轧过程中影响该模型温度场的轧制参数进行了深入的研究。从而优化了模型的建立，提高了数值模型模拟结果的可靠性。     

带钢热轧过程中轧件横断面上温度场的解析

通过对带钢热这轧过程中传热关系的分析，利用有限元法建立轧件横断面温度场的计算模型。利用该模型对本钢热轧厂的现场生产条件进行了计算，依据计算结果总结出热轧过程中轧件断面温度场的变化规律。     

基于轧制机理和混合神经网络的热轧精轧带宽预测

热轧带钢成品的宽度精度直接影响产品成材率，是产品性能提升的关键，而精轧区带钢出口宽度的精准预测可以为粗轧区宽度控制模型参数提供及时的优化调整指导。传统机理模型与实际情况往往存在较大差异，现有的数据驱动模型大多采用神经网络方法，但没有考虑轧制数据的时序性以及数据剪枝带来的信息损失。为了进一步提升精轧带钢宽度预测精度，提出一种基于轧制机理的混合神经网络宽度预测模型，利用精轧宽展的机理模型计算宽度基准值，结合卷积神经网络(CNN)和门控循环单元(GRU)输出宽度预测纠偏值。利用2 250 mm热连轧钢厂数据集试验，结果表明本文提出的热连轧带钢宽度预测模型训练效率较高，98.7%带钢宽度的预测精度在4 mm内，较传统BP神经网络模型和其他单一结构网络有大幅提升，且模型在线测试速度满足工业现场应用需求。     

带钢平整轧制过程中板形缺陷的遗传和演变规律

应用ABAQUS有限元软件对平整轧制过程进行三维弹塑性建模及仿真研究,通过温度场模拟入口带钢的初始板形缺陷,利用刚性工作辊的辊形变化综合表达各板形控制手段对承载辊缝形状的调控功效.基于以上力学模型,针对具有初始板形缺陷的带钢,仿真研究平整轧制后带钢的板形缺陷及其与初始板形缺陷及平整工艺条件的关系,揭示带钢平整轧制过程中板形缺陷的遗传与演变的规律.仿真计算结果表明,承载辊缝形状是决定带钢板形缺陷遗传和演变的最主要因素,轧前带钢的初始板形缺陷的程度,即最大纵向延伸差的大小,对平整后带钢的板形缺陷仅有一定程度的遗传性影响.      

热轧带钢轧制过程的稳定性

在分析热轧带钢时产生带钢运行故障原因的基础上，对带钢粗轧和精轧等过程提出了相应的控制措施．提高了带钢轧制过程的稳定性，保证了带钢产品的质量．     

基于稳定生产的热轧压力AGC控制研究

热连轧液压压力AGC（厚度自动控制）是带钢厚度控制和精轧稳定轧制的核心。结合实际生产,创新了热连轧变压力AGC控制的方法,即在保证带钢正常轧制的前提下,克服了带钢温度异常、新品种模型设定不准、带钢尾部轧制压力大等产生的液压压下波动。生产实际表明,采用此控制方法可减弱多种因素对精轧液压压下系统稳定控制造成的干扰。     

提高热轧板卷终轧温度的研究

根据攀钢热轧生产工艺流程 ,建立了带钢轧制过程的数学模型。该模型计算值与实测值基本吻合 ,温度偏差≤± 15℃。利用该模型定量分析了轧制速度、轧制节奏、轧制道次、加热温度等工艺参数对热轧板卷终轧温度的影响 ,在此基础上 ,提出了提高热轧板卷终轧温度的技术措施。经现场大生产实际应用 ,可以满足冷轧冲压系列钢板尤其是超低碳IF钢对热轧高温终轧的要求     

熔炼次数对M17返回料合金成分、组织和性能的影响

实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.