高速连铸钢水温度控制

介绍了攀钢在连铸机开展１．８ｍ／ｍｉｎ高速连铸改造的温度控制实践,采取了钢包保温,钢包预热ＬＦ工位钢包炉加热和废坯降温调节钢包钢水温度,中间包保温控制浇注过程浊除等措施,连铸钢水出钢温度比原来降低１０～１５℃,取得中间包钢水过热度≤２５℃的良好效果。     

电炉钢水温降规律及分析

为了进一步降低电炉钢水出站温度及中间包钢水过热度,减少精炼电耗和其他消耗,提高铸坯质量,根据一炼钢厂三项攻关协调会议要求,成立降低电炉钢水温度测试及攻关小组,探索钢水从出站到连铸整个浇铸过程中钢水温度变化规律,确定中间包允许浇铸最低钢水温度,分阶段降低精炼钢水出站温度和中间包钢水过热度,45钢和20MnSi出站温度达到1580℃和1590℃,中间包过热度低于35℃。     

新型纳米级微孔隔热材料在炼钢生产中的应用

唐山中厚板材有限公司针对炼钢生产中钢水热量损失过大问题,在转炉、钢包和中间包上,系统采用了新型WDS纳米级微孔隔热材料,提高了耐火衬的蓄热量,在不影响耐火材料使用寿命的情况下,转炉的终点温度提高了7℃,从转炉、钢包到LF炉过程温降速度减小了0.3℃/min,采取降低LF炉出站温度5℃的方式,中间包后期钢水温度仍然能够满足连铸工艺需要,达到了节能降耗的目的,可以产生综合经济效益1480万元/a。     

钢液过热度控制对连铸工艺和铸坯质量的影响

研究了25 t钢包炉和16 t中间包中GCr15、60Si2Mn、40Cr和20钢液的过热度控制。钢液过热度控制主要取决于钢包衬蓄热过程达到平衡状态时钢液温降速率-钢包和中间包钢液温降速率分别为≤1℃/min和≤0.5℃/min;钢液过热度为15～35℃时,200 mm×200 mm铸坯等轴晶率可达20%～30%,连铸拉漏率≤0.23%,铸坯质量良好。     

连铸过程钢水温度的测定与控制

1钢水温度的测试据统计，1994年因钢水温度波动过大造成的拉坯事故达29炉，约占全年拉坯事故的55％。北满特钢公司二机二流特殊钢水平连铸机生产的铸坯断面为130mm×130mm－185mm×185mm，Φ120－200mm，电炉出钢量：30－40t；中间包容量：7．5t。主要生产钢种：碳素结构钢。合金结构钢、模具钢等钢类。近几年在连铸生产中对钢包、中间包烘烤温度，出钢温度，吹Ar后钢包内钢水温度，抬包至开浇过程温度，中间包内钢水温度等进行了测试。测试的方法主要是在连铸过程用测温枪点测钢水温度和使用红外线测温仪测定钢包、中间包烘烤温度及覆盖渣…     

IR—UT：钢包调温技术的开发

为降低转炉出钢温度，提高炉龄，需要研究钢水在钢包内二次升温的工艺技术。我们根据试验结果，开发了钢包调温技术。其主要特点：①可以快速提高钢水温度；②经对比试验，ＩＲ－ＵＴ法的钢材质量与一般吹氩钢材质量相同；③转炉出钢温度可降低１０℃；④稳定连铸中间包内的钢水温度，提高温度命中率。     

钢水温度过程控制优化

针对安钢第一炼轧厂钢水控制中出现的精炼电耗炉次差别大、连铸中包温度合格率偏低等的情况,在炼钢、精炼、连铸、生产组织、钢包、中间包等影响温度的各个控制环节进行了优化,精炼电耗比原来降低8kW·h/t左右,钢水中包温度控制合格率由85%左右提高到97%以上.     

水平连铸中间包

水平连铸中间包１．水平连铸中间包起什么作用？水平连铸中间包主要是联系炼钢炉与连铸机的中间环节。中间包主要作用是：（１）保温、储存钢水；（２）夹杂物能更充分上浮；（３）容易实现“多炉连浇”。中间包容量按炼钢炉容量或钢包容量选择。在炼钢炉容量较小时，钢包...     

轴承钢GCr15连铸钢水流动性差的原因和改进措施

GCr15连铸钢水流动性差,主要表现为钢包钢水流不出或中间包水口内钢水流量小.生产统计数据表明,随连浇炉次平均[AI](0.01%～0.03%)增加,[Ti](0.003%-0.007%)降低,Mn/Si(1.45～1.60)增加,钢水的流动性提高,此外LF精炼周期长(80 min),中间包钢水过热度低(25℃),不利于提高钢水流动性.提高钢水的洁净度,适当提高[A1]和Mn/Si,控制精炼时间和中间包钢水过热度,可有效提高GCr15钢水的流动性.     

高效连铸钢包周转的动态管理模式

武钢第一炼钢厂“平改转”后,随着工艺的不断成熟。品种的迅速开发,对钢包的要求日趋严格,结合本厂生产特点剖析钢包周转过程的时间及温度,以及节降耗为宗旨,以稳定过程温降为目的,建立钢包周转模式,以便于掌握各工序间的温度,节奏关系,确保炉机节奏,稳定中间包钢水过热度,优化钢包的生产管理物流控制,为高效连铸生产的顺行提供了保障。     

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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