EAF-LF-VD流程冶炼T91钢的工艺研究

对采用EAF-LF-VD流程冶炼T91钢的工艺进行了研究.电炉出钢将C、P的质量分数分别控制在0.02%和0.004%之内,是确保后续工序钢水[C]、[P]合格的必要条件.LF通过制定合理的合金化制度和做好合金的选用,可将钢中合金元素含量控制在内控范围.做好LF脱硫及VD真空脱气,可将钢水S的质量分数降至0.005%以下.研究表明,采用本工艺冶炼T91钢是可行的.     

电炉采用大比例直接还原铁冶炼技术分析

对中东某钢铁企业电炉采用大比例直接还原铁冶炼的技术特点进行分析,实际生产表明:电炉采用大比例直接还原铁冶炼时采用大留钢量、炉顶连续加料、100%直接还原铁连续冶炼、泡沫渣冶炼、熔池搅拌等技术均有利于生产组织及钢水质量。     

低碳低硅钢(SPHC)电炉生产实践

电炉生产低碳低硅钢的难点是电炉的终点控制、脱氧合金化以及钢中[Al]的控制和精炼炉抑制回硅.介绍了八钢110t电炉生产SPHC钢从原材料到冶炼过程严格按标准化操作,电炉精炼及连铸全程保护浇注,防止钢水的二次氧化减少夹杂物带入的生产实践.     

20JGC型浇钢平车的设计与改进

我厂原采用的浇钢铸锭工艺,是应用浇钢平车,上面装置钢锭模及中注管等。电炉出钢时将钢水倾入钢水包,再用行车将钢水包吊至电炉前的浇钢平车上面,使其出钢口对正中注管中心后进行浇注。 这种浇注工艺有以下缺点:(1)用行车吊钢水包浇注,出钢口不易对正浇注中心,容易晃动,发生钢水飞溅伤人。(2)平车上只能放置两组钢锭模,因此只适用于15吨钢水包,若产量增为20吨,则不能满足需要,生产效益不高。(3)由于一次只能     

用差压法连续测量EBT电炉的倾动角度

1 概述 电炉炼钢在我国已相当普遍,据统计目前有千余座电炉在运行。为了达到无渣出钢和生产优质钢种,许多工厂的电炉采用了偏心炉底出钢技术(EBT)。这种技术具有倾动角度小、出钢时间短、钢水氧化少和能耗低     

RH精炼脱氧过程铝含量预报模型

在河北钢铁集团唐钢公司RH生产实绩的基础上,采用多元线性回归的计算方法,建立了RH精炼铝脱氧过程钢水溶解铝含量的预报模型.模型计算结果表明,RH脱碳结束后钢水中的溶解氧含量越高,脱氧后钢水中的溶解铝含量越低;适当高的钢水温度有利于提高钢水溶解铝含量;随钢水脱氧加铝量的提高,钢水中的溶解铝含量逐渐增大.钢水溶解铝含量的实测值基本围绕着预报值波动,模型较好地预测了河北钢铁集团唐钢公司RH精炼铝脱氧后钢水中的溶解铝含量,研究开发的模型可信.     

电炉短流程生产20~#管坯钢工艺实践

莱钢特钢厂采用50tUHP电炉—LF精炼—大方坯连铸—半连轧短流程代替原模铸工艺生产20#管坯钢。通过实施精料方针、规范脱氧化工艺、优化吹氩处理工艺、选择最佳二冷区配水模型、采取钢水低过热度浇注和全程保护浇注、控制拉速、控制开轧温度等,产品成材率、合格率分别达到95.8%、99.3%,满足了国标要求。     

高洁净度焊丝钢低硅控制的工艺改进

采用电炉生产高洁净度焊丝钢(C≤0.10%、Mn:0.35%~0.45%、Si≤0.04%、P≤0.006%、S≤0.003%),主要工艺难点是精炼过程在保证脱氧良好的情况下控制钢中硅含量。通过采取优化脱氧工艺、控制渣量及渣中Al2O3含量等措施,有效防止了精炼过程中钢水硅含量的增加,满足了高洁净度焊丝钢的质量要求。     

20CrMnTi齿轮钢生产工艺改进

简述了某炼钢厂将转炉冶炼的齿轮钢钢水倒运到电炉车间进行精炼的工艺管控过程.包括转炉的脱磷和 挡渣操作,精炼炉的送电制度,钙处理等影响质量的关键控制环节.同时也对轧制工艺进行改进,采用控轧控冷的TMCP技术,使圆钢轧材质量更加稳定.     

辊环离心铸造钢液流动和传热的数值模拟

建立了轧辊辊环卧式离心铸造钢液流动和传热的二维耦合模型,采用大型CFD软件FLUENT求解得到重力和离心力场下的流场、温度场分布和钢液偏心情况,并讨论了钢水流动对凝固过程的影响,分析结果对离心铸造的工艺设计有参考价值.     

Simulation and application of pulsating bottom-blowing in EAF steelmaking

Pulsating bottom-blowing was proposed to strengthen the electric arc furnace (EAF) molten bath stirring. The fluid flow characteristics and stirring effects of different pulsating bottom-blowing modes on EAF molten bath were studied through water model experiments and numerical simulations. The mixing time was measured by water model experiments and the flow field characteristics of EAF molten bath were simulated by numerical simulations. Compared with conventional bottom-blowing, pulsating bottom-blowing can accelerate the fluid flow velocity and improve the stirring of molten bath. With pulsating bottom-blowing, the molten bath fluid flow field is more disorder, the fluid flow velocity increases and the dead zone volume decreases. Compared with EAF steelmaking with conventional bottom-blowing conditions, pulsating bottom-blowing technology can improve the metallurgical effects and the molten steel quality in EAF steelmaking with lower FeO content of final slag, lower phosphorus content and carbon-oxygen equilibrium of final molten steel, and lower temperature deviation.     

130 t直流电弧炉喷吹过程的优化模拟

在当今经济健康发展的背景下,电弧炉炼钢凭借其污染小、流程短和产品多样的特点,已逐渐成为各大钢铁企业大力发展的对象,在整个钢铁生产的地位比以往的每个时候都要重要,而电弧炉熔池的流动状态会直接影响电弧炉的冶炼效果,这主要与氧枪喷吹强度和布置方式有关.为研究不同工况条件下电弧炉流场的变化,为大型电弧炉选取最合适的工艺参数,以...     

超(超)临界锅炉用Super304H钢管研究试制

对Super304H的冶炼、冷加工、固溶热处理工艺进行了研究;观察了钢坯和钢管的显微组织.通过在EF和LF炉中深度脱硫,钢中硫的质量分数可达0.005%以下;钢坯中具有极少量的δ铁素体,钢管具有单相奥氏体组织;钢的冷加工硬化与其他18Cr-8Ni型不锈钢相当,冷加工性能优异,可采用类似的冷加工工艺;固溶热处理对钢管晶粒度有明显影响.试制钢管的化学成分及各项室温性能完全符合技术条件要求.     

高塑性 Cr-Mn-Ni-Cu-N 奥氏体不锈钢 YGA201的研制

在实验室采用200 kg非真空感应炉研制了成分(％)为:≤0．10C,5．0-9．5Mn,16．0-19．0Cr, 3.5～5.5Ni,1．0～2.0Cu,≤0.2N的奥氏体不锈钢YGA201。力学性能和腐蚀试验结果表明,YGA201不锈钢含1．0％-2．0％Cu,使其1 050℃固溶处理后的延伸率达60％,高于ASTM201不锈钢(延伸率44％),该钢热加工性能和1 mol／L H₂SO₄中的耐腐蚀性能与SUS304(18Cr-8Ni)不锈钢相当。     

奥氏体不锈钢加热工艺研究与实践

结合加热工艺制度的制定与应用,对SUS304奥氏体不锈钢炉温制度、加热速度、炉温均匀性等基本要素进行了研究,并以其生产实绩的综合分析,验证了SUS304钢加热工艺的合理性.     

AOD炉的高效化冶炼模型

 以往的AOD炉高效化冶炼研究往往通过提高供氧强度,优化转炉的炉容比,提高终点命中率等技术缩短冶炼周期,需要充分利用现有的设备,优化炉料结构和供氧制度,对生产工艺参数进行优化,充分利用这些物理热和化学热,实现AOD炉的高效化冶炼。开发了AOD炉高效化冶炼模型,在AOD炉物料平衡和能量平衡的基础上,结合AOD炉冶炼的工艺特征,建立AOD炉耗氧量和冶炼周期模型,分析了AOD炉冶炼周期随着铁水比和废钢比的变化趋势,得出冶炼周期最短时的炉料结构。结果表明：电炉不锈钢母液加铁水冶炼时,冶炼周期随着铁水比的增加而增加。电炉不锈钢母液加废钢冶炼时,冶炼周期随着废钢比的增加而增加。铁水加废钢冶炼时,冶炼周期随着废钢比的增加而延长。以硅铁为发热剂比以碳粉为发热剂冶炼周期短。     

Numerical Simulation and Industrial Experimental Research on the Coherent Jet with “CH4 + N2” Mixed Fuel Gas

Metallurgical and Materials Transactions B - Coherent jet technology is widely used in the electric arc furnace (EAF) steelmaking process to deliver more energy and momentum into the molten steel...     

Numerical study of dc arc plasma and molten bath in dc electric arc furnace

Abstract

A numerical study of the arc plasma and molten bath in a dc electric arc furnace (EAF) is useful for understanding and improving the production process of the dc EAF. In the present paper, a mathematical model based on conservation equations of mass, momentum and energy along with Maxwell's equations is developed to describe the flow field and heat transfer in the arc and molten bath regions of a dc EAF simultaneously. The governing equations are solved using the PHOENICS software package. The calculated results show good agreement with those of previous studies, giving a useful insight into the factors of arc heat transfer and bath circulation.     

三步法和二步法不锈钢冶炼工艺的分析和生产实践

分析了HM DEP-KOBMS-VOD三步法(铁水脱硅和脱磷预处理-KOBMS转炉脱碳、合金化-真空吹氧脱碳)和EAF/BOF-AOD二步法(电弧炉炼300系不锈钢母液/400系钢转炉脱磷-氩氧脱碳和合金化)生产不锈钢的生产效率和成本。三步法工艺生产铬不锈钢和超低碳氮不锈钢具有生产效率高、氩气消耗低、P-Cu-Pb有害杂质含量低的优势,而EAF-AOD二步法工艺生产304、316L等铬镍不锈钢有可使用含镍生铁、不锈钢废钢、生产成本低,效率高的优势。文中介绍了太钢用三步法和二步法工艺生产的不锈钢品种结构和工艺实践。     

Foaming in Electric Arc Furnace—Part II: Foaming Visualization and Comparison with Plant Trials

The kinetics of slag foaming by limestone particles was studied at 1773?K (1500?°C) with the aid of an X-ray imaging system. Two models were implemented to describe the decrease in foam height with the time on the basis of the lowering of the average temperature and CaO shell formation during decomposition reaction. The energy impact of carbonate additions was studied on an industrial scale in a 100-ton electric arc furnace (EAF). It was found that, in the case of the addition of carbonates after the scrap is completely molten, the heat effects for limestone and dolomite (2255 and 2264?kJ/kg, respectively) were only 70?pct from theoretical values. Comparing these values with similar additions during the scrap melting stage shows that the energy requirements in the case of carbonate additions to steel bath are much smaller. It was found from the trial heats with dolomite addition to the steel bath that the partial substitution of lime by raw dolomite can be made without an increase in energy consumption.