120 t精炼炉钢包底吹氩系统改造

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.     

八钢钢包底吹氩技术的工艺设计

从底吹氩透气砖参数、底吹氩压力、流量、时间等有关工艺参数方面介绍八钢炼钢厂钢包底吹氩的工艺设计。实践证明 ,钢包底吹氩工艺改善了钢水温度和成分的均匀性 ,基本满足了连铸对钢水质量的要求 ,说明钢包底吹氩工艺的设计是合理、可行的     

吹氩站多功能精炼技术的开发

武钢二炼钢吹氩站改造后,钢水吹氩精炼更能满足生产需要.经过一年多的开发,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、喂炭线微调C、真空钢水调温取样、出钢前透气砖试吹氩气提高钢包底吹氩成功率,大大节约了生产成本缩减了工序时间.     

70t LF吹氩工艺的优化

引进钢包底吹氩气控制系统,实现压力与流量的双重控制。利用智能吹氩系统对吹氩工艺进行优化,根据精炼不同时间段的精炼目的,选择4种不同的吹氩模式,制定了吹氩标准化操作的模式,指导钢水吹氩操作。     

吹氩站多功能精炼技术开发

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。     

氩站钢包智能吹氩技术生产探索

钢包底吹氩是炼钢生产中常规的钢包搅拌方式,提供钢水成分温度均匀、夹杂物上浮等冶金功能所需的动能.研究表明,通过建立吹氩模型和钢包钢水裸露面积大小的视频监控,可以满足钢水夹杂物控制对钢水吹氩搅拌的要求,有助于高效化、智能化钢包吹氩技术应用.     

钢水精炼吹氩搅拌机理的研究

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。     

双透气砖钢包吹氩技术的应用

通过应用钢包双透气砖吹氩技术,提高了钢包底吹率,减少了钢包底吹氩死区,使钢水成分和温度更加均匀,并降低钢中夹杂、减少铸坯成分偏析,因而提高了钢水质量及轧材性能的稳定。     

250t钢包透气砖安装位置的优化

利用1：4水力学模拟试验研究了钢包透气砖最佳安装位置、CAS罩的最佳浸入深度,获得了钢包吹氩精炼过程的最佳吹气量,对不同渣层厚度选择合适的排渣气量进行了探讨。研究结果不仅有利于提高钢水成分和温度的均匀性,而且对提高钢水洁净度和加强吹氩精炼冶金效果具有很好的作用。     

武钢二炼钢提高钢包底吹氩吹成率的实践

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...     

超纯轴承钢的精炼工艺

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.     

150t AHF炉外精炼工艺参数优化

本钢炼钢厂通过大量生产实践,对150tAHF炉外精炼设备在实际运行中的氧枪枪位、氧气流量及压力、氧铝配比、浸罩插入深度、底吹氩控制模式、顶渣量优化、合金加入时机及加入量、喂线参数控制等主要参数进行了系统优化。在此基础上,对钢水炉外化学升温精炼与常规精炼的冶金效果及对钢水质量的影响进行了对比分析。     

60 t BOF-LF(VD)-150 mm×150mm连铸生产GCr15轴承钢的工艺实践

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。     

Numerical Simulation of Fluid Flow in Bath during Combined Top and Bottom Blowing VOD Refining Process of Stainless Steel

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.     

Process for improving the ladle free-opening rate for high aluminum steel in continuous casting

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.     

180t钢包底吹氩过程钢液流场特性数值模拟

为增强钢厂180 t钢包底吹氩过程搅拌效果,根据模型设计参数建立了底吹氩数学模型,运用CFD软件fluent对钢包底吹氩过程流场进行数值模拟.基于流体力学理论,计算并分析了底吹氩过程中心间距1/3R,1/2R和2/3R和底吹氩气流量300～1000 L/min对钢包内流场、"死区"比例及混匀时间等的影响规律.结果 表明...     

LF炉钢包底吹氩气体流量与配电联动的研究与应用

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。     

Numerical Simulation of the Three-Phase Flow of a Bubble Interacting with the Steel–Slag Interface During the Secondary Refining Process

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...     

重钢LF脱硫工艺的研究及实践

依据脱硫热力学原理和动力学原理并结合重钢炼钢厂的实际,从精炼渣系的组成、造渣工艺、脱氧工艺、底吹氩搅拌、温度控制等方面介绍了重钢炼钢厂LF脱硫生产实践。