含钛不锈钢连铸水口结瘤和结晶器"结鱼"

总结了前人在含钛不锈钢方面的研究工作和工业实践进展.指出合钛不锈钢结晶器"结鱼"主要是由于钢中氮钛浓度积偏高,导致TiN夹杂物大量析出,并在结晶器弯月面聚集,与保护渣反应放出氮气,致使局部钢液温度下降凝固后形成的;TiN型水口结瘤主要由于浇铸过程中TiN夹杂物附着在浸入式水口内壁造成的;TiO2型水口结瘤主要是二次氧化造成TiO2夹杂物大量增加,并在浇铸过程中附着在连铸水口内壁形成的;CaO·TiO2型水口结瘤主要是钢中Ca＞0.001%,Al＞0.01%的情况下,加入Ti后钢中形成数量较多的CaO·TiO2-MgO·Al2O3双相夹杂物,并在浇铸过程中附着在水口内壁形成的.同时阐述了上述连铸水口结瘤和结晶器"结鱼"的控制措施和工业实践中取得的进展.     

极低过热度连铸技术及水冷水口设计的研究探讨

在分析连铸过程中钢水过热度对连铸坯的内部质量和连铸机产量影响的基础上，以不改变现有连铸设备为前提，将原结晶结昌器长水口改造为水冷长水口，降低钢水进入结晶器对时过热度，改善铸坯的中心偏析和内部质量，提高铸坯出结晶器时的厚度，以提高连铸机的拉速，从而提高连铸内部质量和连铸机的产量。     

改善321含钛钢水口堵塞及结晶器“结鱼”现象的工艺实践

针对浙江永兴不锈钢股份有限公司321连铸易堵塞水口及结晶器结鱼问题,进行理论研究及现场随炉试验,通过一系列工艺改善来提高钢水纯净度,降低钢水中[N]及[O]的含量,同时适当调整连铸操作工艺,最终冶炼出较高纯净度的钢水：熔炼样钢水[N]≈0.01%,[O]≈0.0028%,成品夹杂物等级控制在国家标准范围内（GB/T 10561）,从结果来看,连铸水口堵塞现象大大改善,结鱼现象消失,顺利实现了两炉以上连浇,同时铸坯表面及内部质量良好,符合后续轧制要求。     

钢铁冶炼新技术讲座之十二连铸新技术(二)

2提高连铸坯洁净度技术连铸过程中生产洁净钢,一方面是去除液体钢中氧化物夹杂,进一步净化进入结晶器的钢水,另一方面是防止钢水的再污染。对于液体钢中夹杂物去除主要决定于夹杂物形成、夹杂物传输到钢——渣界面和渣相吸附夹杂物。对于防止连铸过程钢水再污染,主要决定于:(1)钢水二次氧化;(2)钢水与环境、钢水与空气、钢水与耐材相互作用;(3)钢液流动与液面稳定性(渣-钢界面紊流、涡流);(4)渣钢浮化卷渣。2.1生产洁净钢主要控制技术(1)保护浇注技术常用的钢水密封保护如:中间包密封、钢包→中间包采用注流长水口 吹氩保护,中间包→结晶器…     

LB—352液位计的应用研究

本文介绍了ＬＢ－３５２液位计在连铸结晶器钢水液位测量与自动控制中的应用。用根据连铸结晶器尺寸、预先制做的长形试块,模拟连续铸钢过程中,结晶器内钢水液位的波动等方法,对ＬＢ－３５２液位计进行初步的标定和调试。在连铸热调过程中,对其进行与拉坯实际情况逐步迫近的细调试,最终达到了ＬＢ－３５２液位计与ＰＬＣ控制器、液压伺服系统联锁控制塞棒动作,调节由中间包流入结晶器钢水的流量,实现了结晶器内钢水液位在点达     

钢铁冶炼新技术讲座之十二

2 提高连铸坯洁净度技术 连铸过程中生产洁净钢，一方面是去除液体钢中氧化物夹杂，进一步净化进入结晶器的钢水，另一方面是防止钢水的再污染。对于液体钢中夹杂物去除主要决定于夹杂物形成、夹杂物传输到钢——渣界面和渣相吸附夹杂物。对于防止连铸过程钢水再污染．主要决定于：     

连铸结晶器钢水液面控制系统探析

连铸结晶器钢水液面控制系统对于保证连铸机的稳定安全运行、优化生产操作步骤、提高铸坯质量、避免出现溢钢或漏钢问题具有重要意义。分析了连铸结晶器的钢水液面控制系统的作用与原理,阐述了连铸结晶器钢水液面控制系统设计原则,有利于加深对连铸结晶器钢水液面控制系统的理解。     

冷镦钢SWRCH6A钢水可浇性研究与控制

韶钢炼钢厂生产冷镦钢SWRCH6A时,在连铸浇注过程中容易出现堵水口的现象.水口堵塞后造成连铸结晶器液面波动大,结晶器内的钢水易出现卷渣和二次氧化,严重时甚至连铸机异常终浇.文章主要对SWRCH6A钢水可浇性差的原因进行了研究分析,并对关键工艺进行调整,使钢水可浇性得到明显的改善.     

不锈钢结晶器保护渣吸收钛的粘度效应

1引言 关于钛稳定不锈钢不可避免地生成某种TiN，在连铸过程中，有意添加的钛会在接近钢水的液相线温度时与钢水中的残余氮反应。这种固体物质在连铸过程中的沉淀会引起水口堵塞、结晶器粘结和板坯表面缺陷，当氮化钛被结晶器保护渣吸收，它还会影响结晶器保护渣的润滑性能。但是，氮化钛在结晶器保护渣中的溶解度很小，按质量计算〈0．5％。因此，预计钛会按氮化物氧化（而生成二氧化钛和氮气），以氧化物的形式进入结晶器保护渣中；（而结晶器保护渣中的）二氧化硅很可能是一种氧化剂，它与溶解于钢水中的钛直接反应而形成钛氧化物。这些氧化物可能包括TiO2和一些如Ti3O5低价氧化物。     

连铸结晶器钢水液位控制系统分析

为了获得高品质钢，连铸生产中应精确控制结晶器钢水液位。一种先进的组合式结晶器钢水液位控制系统(包括一个PID基本控制器和若干功能模块)用以有效控制生产过程中的变化和干扰，与过去传统的结晶器钢水液位控制系统相比，其能更有效地控制结晶器钢水液位。     

Chinalco Signed Framework Agreement for Strategic Cooperation with Harbin Municipal Government

正Last month,Chinalco signed framework agreement for strategic cooperation with Harbin Municipal Government in Harbin Xiong Weiping,Chairman of Chinalco,said that based on the strategic deployment to build world top-class mining company with the highest growth potential,Chinalco was now concentrating all efforts on making strategic transition and structural adjustment,strategic cooperation with the local governments where     

Jiangxi Promotes Jiangxi Copper Corporation To Become The World's Most Competitive Mining Company

<正>According to the latest info from Jiangxi Province State-owned Assets Supervision and Administration Commission,Jiangxi Copper Corporation was approved to become the first pilot enterprise for deepening reform.Contents of the pilot work is"Three Self"(self expansion,self decision-making,self     

Journal of Rare Earths Contents List of Vol.32(2014)

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Contributions to Baosteel Technical Research wanted

正Baosteel Technical Research,a quarterly journal,which is issued domestically and abroad,is run and sponsored by Baosteel Group Corporation.Baosteel Technical Research mainly reports the achievements in technological innovation,academic research,new product development and industrial equipment improvement by Baosteel.It will continue to follow up on hot topics and serve the company’s technological development and progress.Its readers include experts in     

Ministry of Industry and Information Technology: No Short Term Solution For Our Country’s Excess Nonferrous Metal Smelting Capacity

【正】According to the Ministry of Industry and Information Technology,the Ministry has released the 2013 Operation Report on China’s Industrial Communication Indu...     

Chinalco Signed Framework Agreement for Strategic Cooperation with Gansu Province

正Recently,Chinalco and Gansu Provincial People’s Government signed"Framework Agreement for Strategic Cooperation on Reform,Restructuring and Transition Development of Chinalco’s Electrolytic Aluminum Enterprises in Gansu",signifying that the strategic cooperation between Chinalco and Gansu Province had made new substantive progress.     

Unavoidable Economic Cycle:30% Of Nonferrous Metal Companies Were Involved In Restructuring

正Owing to continual downturn in real estate and bulk commodity markets,a number of traditional industries in China suffered unfavorable impact in performance.With the progressive disclosure of third quarter report,the no-pleasant-surprise performance of     

Baotou Rare Earth Became the World's Biggest High Performance Magnetic Material Base

正The High Performance Magnetic Material Phase II Project,an industry upgrading project implemented by Inner Mongolia Baotou IronSteel Rare Earth(Group)Hi-tech Co.,Ltd,recently basically finished equipment commissioning,signifying that the enterprise had developed the production capacity of15000 t/a Nd-Fe-B strip casting alloy and 5000t/a Nd-Fe-B magnet,thus becoming the world’s     

Introducing Two Central Enterprises to Integrate Rare Earth Industry,Shandong Rare Earth Group Breaks Surface

正With the signing of"Letter of intention for Propelling Integration of Shandong Rare Earth Enterprises"between Shandong Province Commission Of Economy and Informatization,China IronSteel Research Institute Group("China Steel Institute"),and China Rare MetalsRare Earth Co.,Ltd("China Rare Earth"),the"Shandong Rare Earth Group"jointly set up by the 3 units thus broke surface.On August 9,reporters of the China Economic Herald learned from Shandong Province     

Aluminium Production by Province or City in 2014

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