基于射钉法的板坯连铸工艺优化

利用射钉法测定了连铸机板坯冷却过程凝固坯壳厚度,重点分析了中间包钢水过热度、拉速、二冷区冷却制度与铸坯凝固系数之间的关系,对凝固系数影响大小的顺序为:过热度＞拉速＞比水量.采取控制中包钢水过热度及拉速,优化二冷配水工艺,调整铸机扇形段开口度等措施,铸坯中心偏析平均级别由B1.5 ～ B2.0降低至B0.5～ B1.0,试样分层缺陷改判率由0.36％降低至0.06％.     

连铸坯凝固过程中传输现象基础知识系列讲座：第十五讲 热量传输基础知识？

介绍了传热学的一些基本概念，原理和传热微分方程，定解条件及连铸坯凝固的特点，连铸坯的凝固过程中可概括为一个内部具有液相流动的热量的传递过程，并把坯壳在连铸机中的冷却看成是“热处理”过程。     

鞍钢厚板坯凝固坯壳厚度的测定

运用"射钉法"准确地标定了鞍钢厚板坯连铸机二冷区铸坯凝同坯壳厚度及铸坯凝固系数,为评价现有二冷系统的冷却能力、制定合理的二冷配水制度和高拉速条件下的工艺参数提供了重要依据.     

连铸坯凝固过程中传输现象基础知识系列讲座 第十五讲热量传输基础知识和连铸坯凝固传热特点

介绍了传热学的一些基本概念、原理和传热微分方程、定解条件及连铸坯凝固的特点。连铸坯的凝固过程可概括为一个内部具有液相流动的热量传递过程，并把坯壳在连铸机中的冷却看成是“热处理”过程。     

方坯结晶器

1 前言 结晶器是连铸机中最重要的部件之一。从传热学角度讲,它是个热交换器,由流经它的冷却水带出钢水凝固潜热,使钢水凝固成具有一定厚度坯壳的铸坯。结晶器对铸坯表面质量优劣,连铸生产正常与否有着直接和重要的关系。 对结晶器的技术要求,主要包括以下几个方面: (1)传热性能好,冷却强度可调钢水在结晶器内凝固成坯壳,其传热路     

板坯连铸机凝固层厚度的研究

本研究工作运用“射钉法”铁标定了舞钢板坯连铸机二镒区凝固坯壳厚度及凝固系数,为评价现在二冷系统的冷却能力,制定合理的二冷配水制度和高拉速条件下的工艺参数以及探讨铸坯质量缺陷的成因提供了重要依据。     

包晶钢板坯连铸机结晶器液面波动的原因

在板坯连铸机实际生产操作中发现,生产包晶钢的时候明显存在结晶器液面波动的问题。结晶器液面波动的问题致使生产出来的成品表面有裂纹缺陷,直接造成铸坯的不合格率上升。介绍了连铸机的分类、包晶钢连铸工艺以及结晶器液面波动表现形式。分析了连铸机液面波动产生的原因,并提出了优化措施。认为连铸机坯壳厚度不均匀、板坯拉出结晶器阶段产生"鼓肚"、设备精度不够、钢种特性、保护渣的状态以及冷却温度的设定均有可能导致结晶器液面波动。通过对保护渣性能、冷却制度、液面控制系统等方面优化调整,板坯连铸机包晶钢结晶器液面波动情况明显改善,产品质量的稳定性得到大幅提高。     

莱钢小方坯连铸机二次冷却工艺优化

介绍了莱钢小方坯连铸机二次冷却工艺优化过程。通过分析二次冷却工艺存在的问题,设计了基于参数控制的一元二次曲线配水模型,优化了喷嘴型号、喷淋集管,铸坯冷却均匀性得到显著改善,有效解决了小方坯脱方、角裂质量问题。     

射钉法测量坯壳厚度在济钢大板坯连铸机上的应用

采用射钉法测量济钢大板坯连铸机坯壳厚度,将实测结果与理论计算的结果进行对比,修正了综合凝固系数,指导改造了二冷喷嘴的结构,加强了铸坯冷却强度,年铸坯产量达225万t。     

浅析圆坯连铸机二冷水改造的可行性

马钢一钢轧总厂炼钢分厂圆坯连铸机原采用水喷淋冷却的二冷方式,铸坯时常存在皮下裂纹等质量问题,而二冷气水混合冷却具有水流密度大、水滴雾化程度好、冷却面积大、铸坯表面温度波动范围小、冷却水用量少等优势,因此,改造为气水混合冷却方式是必要的。通过对二次冷却的分析计算及喷嘴选型,改造后冷却水总水量约减少30%,原二次冷却冷却水系统可以利用,证明圆坯连铸机二次冷却方式由水冷改为气水混合冷却是可行的。     

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。     

Shijiazhuang will Build the World's Biggest Replacingcopper-with-aluminum Cable Production Base

正Shijiazhuang City will build the world’s biggest replacing-copper-with-aluminum cable production base,the annual output value can reach 100 billion yuan,in the future it will develop replacing-copper-with-aluminum highend industry cluster.This piece of news was learned by the reporter at the Rare Earth highiron Aluminum Alloy[Nonferrous Business Opportunity:Aluminum alloy door]Cable Conductor New Technology Application Seminar held at the provincial capital.     

Chongqing is Preparing to Set Up Nonferrous Metal Exchange,in a Bid to Become the Transit Place of Kazakhstan Copper

正Since the beginning of Chongqing’s upgrading to a municipality directly under the Central Government,Chongqing City has established direct friendly relationship with Almaty,Kazakhstan,and carried out a series of cooperation in commerce and trade,and culture     

Guangxi Baise Extends Industrial Chain to Combat Loss in Aluminum Business

正"For each tonne of aluminum being produced,the upstream enterprise on the aluminum industrial chain will suffer loss about 2000yuan."Said Liang Xiao,Deputy Director of Pingguo Industrial Park Management Committee under the Guangxi Baise City,one of the four major aluminum industry bases in China,on August 11.Extending aluminum     

JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL ANNUAL CONTENTS Volume 21(2014)

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Chinalco Straightened Out Copper Assets,and Delegated Stock Equity of Yunnan Copper

正Immediately after the news that Chinalco transferred 58%stock equity of Yunnan Copper Group to its wholly-owned subsidiary China Copper Corporation Limited free of charge was disclosed on July 9,many individual investors couldn’t help but to think:Does it mean China Copper Corporation Limited will assemble assets for overall listing?At present,among main copper business companies under China Copper Corporation     

The Development and Reform Commission Encourages Private Capital to Enter Geological Prospecting Field

正At the press conference recently held by the National Development and Reform Commission under the theme"Deepen Reform in Investment AuditApproval System",when answering questions from reporters,Huang Min,Director of the Department of Fixed Assets Investment of the National Development and Reform Commission,said that in the future it would continue to intensify efforts in geological prospecting,and actively guide social capital to enter this field.     

Guangxi's first Nickel Industry Development Research Report Was Released

正Recently,Guangxi Metallurgical Research Institute,a subsidiary of Guangxi Nonferrous Metals Group,completed survey on laterite and related manufacturers in the region,by combining the current development status of laterite both at home and abroad,it compiled Guangxi’s first"Research Report on the Development of Guangxi Nickel Industrial Chain"which adopted laterite as the study subject.This report expounded on the current     

China’s Major Non-ferrous Metals Imports & Exports(End of September. 2014)

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China's Major Non-ferrous Metals Imports & Exports

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