共查询到19条相似文献,搜索用时 93 毫秒
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对钢包到精炼位后底吹氩系统不通的原因进行了分析.分别对钢包本体的底吹氩系统和精炼处理位的底吹氩系统进行改造,改造后提高了钢包底吹的一次吹开率,减少了钢水折包次数,促进了精炼和连铸的顺利生产,有效地降低了生产成本. 相似文献
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二炼钢厂吹氩站改造后。钢水吹氩精炼更加能够满足实际生产需要。经过1年多的开发,吹氩站具有以下多种功能:钢包CAS吹氩、微调钢水中[Si]、[Mn]、[Ti]、[Nb]、微调钢水温度、喂铝线微调[Als]、喂碳线微调[C]、出钢前试气提高钢包底吹氩成功率,节约了生产成本缩减工序时间。 相似文献
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高泽平 《金属材料与冶金工程》2000,(4):14-17
对转炉钢在精炼站和LF钢包炉的底吹氩气过程进行了理论分析,并据此提出了吹氩强度与吹氩时间的确定原则,以指导现场对吹氩搅拌强度、搅拌时间的合理控制,提高钢水质量。 相似文献
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武钢二炼钢提高钢包底吹氩吹成率的实践1前言武钢二炼钢厂是一个转炉全连铸炼钢厂,要求100%的钢水经过炉外精炼后再进行连铸烧钢,以保证浇铸顺利和铸坯质量。目前有78%的钢水是通过吹氩处理后再连铸浇钢的。与顶吹氩相比,底吹氩具有吹氩量大,有利于夹杂物的富... 相似文献
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超纯轴承钢的精炼工艺 总被引:1,自引:0,他引:1
通过控制电炉(供氧强度、渣中氧化铁比例、出钢挡渣率、出钢钢液的氧活度)、钢包炉(精炼渣系、脱氧剂、钢液温度、精炼时间、底吹氩压力、精炼钢包耐火材料的选择、铁合金种类的选择)、真空脱气(真空度、真空时间、底吹氩压力)的工艺参数以及真空后的软吹氩搅拌、并采用IPAS系统和控制钢液浇铸速度,使超纯轴承钢(SFGCr15)的w(S)、w(Ti)、w(O)分别达到0.003%、0.001 2%和0.000 7%以下,钢中非金属夹杂物也处于较好水平,满足了国际顶尖轴承厂家对轴承钢的超纯要求. 相似文献
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济源钢铁公司采用60 t顶底复吹转炉高拉碳操作法,控制转炉终点[C]0.08%~0.20%,出钢过程钢包底吹氩并加铝铁脱氧,LF采用CaO-Al2O3-SiO2高碱度渣精炼,连铸钢水过热度20~30℃,M+F电磁搅拌,全程吹氩保护浇铸,铸坯堆垛缓冷工艺生产150 mm×150 mm GCr15轴承钢铸坯。实践表明,GCr15轴承钢的氧含量为(6.3~11.9)×10-6,平均氧含量为9×10-6,连铸坯的低倍组织良好。 相似文献
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The fluid flow in a bath in combined top and bottom blowing vacuum‐oxygen decarburization (VOD) refining process of stainless steel has numerically been simulated. The three‐dimensional mathematical model used is essentially based on that proposed in our previous work for the flow in combined side and top blowing argon‐oxygen decarburization (AOD) process, but considering the influence of reduced ambient pressure. Applying it to the flow in the bath of a 120 t VOD vessel under the refining conditions, the results present that the model can fairly well simulate and estimate the flow phenomena. The flow pattern of molten steel in the bath with the combined blowing is a composite result under the common action of the jets from a three‐hole Laval top lance and gas bottom blowing streams. The jets have a leading role on it; the molten steel in the whole bath is in vigorous stirring and circulatory motion during the blowing process. The streams do not alter the basic features of the gas agitation and liquid flow, but can evidently change the local flow pattern of the liquid and increase its turbulent kinetic energy to a certain extent. The flow field and turbulent kinetic energy distribution in the combined blowing with three tuyeres are more uniform than those in the blowing with double tuyeres. Increasing properly the tuyere eccentricities is of advantage for improving the velocity and turbulent kinetic energy distributions, the stirring and mixing result in the practical VOD refining process. 相似文献
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Steel 20Mn23AlV is a type of high aluminum steel with a very low ladle free-opening rate. The aluminum composition of 20Mn23AlV ranges from 1. 6% to 2. 45%,which is significantly higher than other types of steel.According to the real condition of 40 t ladle in steel-making plant of Baosteel Special Steel Company,previous works show that the key factors affecting the ladle free-opening rate of high aluminum steel in continuous casting are: sand material,accessories baking,ladle nozzle cleaning,the process and amount of adding sand,and the rate of argon stirring during refining. Therefore,improving the ladle filler sand quality,baking all of the raw materials,controlling the addition of ladle filler sand,cleaning the ladle nozzle,and optimizing argon stirring during the refining process can resolve the problem of a low ladle free-opening rate of high aluminum steel caused by the long ladle time of liquid steel. 相似文献
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莱钢特钢事业部通过对现有智能吹氩系统的改进,在实践中不断总结完善,开发了底吹氩气体流量与配电的联动模型。在精炼的不同阶段使用不同的配电模型,并采用模糊理论的PID自适应原理,进而实现使用不同的底吹氩气体流量以及精炼全过程底吹氩系统的精准控制。通过采用此措施,提升了钢水的质量、提高了钢包的使用寿命、减轻了职工的劳动强度。 相似文献
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Liu Wei Yang Shufeng Li Jingshe Wang Feng Zhu Libin Free Michael L. 《Metallurgical and Materials Transactions B》2019,50(4):1542-1546
Metallurgical and Materials Transactions B - Gas stirring is an effective method for the secondary refining process of steel. The microphenomena among the phases of an argon bubble floating in... 相似文献