共查询到19条相似文献,搜索用时 156 毫秒
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转炉具备冶炼低磷钢的生产能力,但生产超低磷9Ni钢,转炉脱磷工艺仍然是主要难点和研究重点。分析了钢水温度、炉渣碱度、FeO和渣量等对转炉脱磷的影响规律,并结合现场工装设备条件,对转炉双联法、三渣法、双渣法3种脱磷模式进行试验对比。双联脱磷工艺半钢温降大、单炉周期长、生产组织难度大,三渣法操作过程复杂、终点磷控制优势不明显。双渣法冶炼周期短,通过优化转炉脱磷工艺,实现了采用双渣法冶炼工艺生产超低磷钢,简化了超低磷钢转炉冶炼流程,提高了生产效率。研究了转炉脱磷主要工艺参数,分析得出采用脱碳氧枪喷头时,供氧流量按脱碳吹炼流量的83.5%控制,可达到良好的脱磷效果并减少铁水碳的烧损;脱磷期半钢碳含量不宜控制过低,半钢碳质量分数为3.0%~3.5%时能保证前期的脱磷效果和脱碳期的热量。脱磷期温度控制在1 300~1 350 ℃,脱磷率较高也有利于炉渣熔化。炉渣碱度为1.8~2.2时,可保证较高的脱磷率和化渣效果。一次倒渣量40%以上,脱碳期终点温度按1 590~1 610 ℃控制,终渣FeO质量分数不小于20%,终渣碱度大于6,转炉终点磷质量分数可降低到0.002%以下。采用下渣检测系统和滑板挡渣操作,严格控制下渣量,出钢采用磷含量低的合金,炉后钢水增磷可控制在小于0.000 5%。通过工业试验,实现了铸机成品磷质量分数小于0.002%。 相似文献
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转炉双联法是一种短周期、低成本冶炼超低磷高质量钢的有效工艺路线。文章从理论入手,分析了转炉双联法冶炼超低磷钢工艺,以及炉渣碱度、FeO含量和冶炼过程温度对磷的质量分数造成的影响。 相似文献
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通过共存理论计算和热力学分析得出添加锂云母矿形成的CaO-MgO-FeO-Li2O-Na2O-K2O-SiO2-P2O5复合脱磷渣的渣-钢磷分配比Lp明显高于CaO-MgO-FeO-SiO2-P2O5基本渣系,并确定锂云母矿的加入最佳时期是转炉吹炼前期。10炉120 t转炉冶炼的超低磷钢的结果表明,与未加锂云母矿的炉次相比,加锂云母矿可以使半钢[P]快速降低至0.044%以下,并且半钢脱磷率和磷分配比Lp分别从40.62%和13.13提高到67.71%和36.89,使转炉平均终点脱磷率和磷分配比Lp分别从92.35%和130.7提高到94.85%和191.9,转炉终点[P]可以控制在0.005%~0.007%,[P]的命中率100%,此复合渣系满足超低磷钢生产要求。 相似文献
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为了实现超洁净低磷钢的批量高效生产,研究开发了大型转炉基于低MgO(2.5%≤w(MgO)≤4.0%)、低MnO(w(MnO)≤1.5%)、高碱度(R≥6)和超高磷分配系数(LP≥1 500)的极低磷钢高效冶炼技术。研究发现,减低钢渣中MgO和MnO含量及提高钢渣碱度可以大幅提高转炉终点渣钢平衡磷分配系数LPbal至1 500以上。通过优化冶炼初期炉料结构,提高钢渣氧化性,实现高速化渣,半钢渣中平均磷质量分数达到3.47%、FeO质量分数控制在17%~20%;通过倒渣模型计算和优化及自动控制,实现半钢快速高效稳定倒渣,经测量半钢结束倒渣量控制在35%以上;通过熔池高效搅拌,使实际生产渣钢磷分配系数LPact与理论平衡磷分配系数LPbal的比值平均为0.81左右。采用低温出钢等低磷钢冶炼技术,实现双渣工艺冶炼转炉出钢最低磷质量分数为0.000 38%、整浇次转炉出钢平均磷质量分数为0.000 73%、整浇次成品平均磷质量分数为0.001 05%的批量、稳定、高效生产,平均转炉冶炼周期为42 min。本... 相似文献
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《钢铁研究学报(英文版)》2011,(Z2):52-58
As the market demand for clean steel increased,a number of new technologies for clean steel production have been developed in some domestic and foreign steelmaking plants.Based on the existing equipments and technical conditions in the No.1 steelmaking plant of Ansteel,a series of clean steel technologies have been integrated including single bay duplex-dephosphorization in steelmaking control technology,high efficiency desulfurization technology,the control technology for nitrogen content during the whole process,the control technology for hydrogen content in VD,and the systematic control technology for oxygen content.A series of process for all kinds of ultra-low phosphorus,ultra-low sulfur and relative low level of inclusions have been designed in clean steel production.This process include hot metal desulfurization and slag-off,single bay duplex-dephosphorization in BOF,molten steel slag-off,LF processing,VD processing,and continuous casting with protection,then a stable,low-cost and large-scale production process has been formed.Applying this integrative technology,the sum of 5 major elements including phosphorus,sulfur,oxygen,nitrogen,hydrogen is less than 80×10-6 in high alloy steel scale production,and the industrial applications for clean steel technology have been achieved. 相似文献
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针对转炉冶炼存在的转炉前期化渣速度慢,冶炼终点钢水、炉渣氧化性高,终点磷含量控制不稳定等问题,利用炉渣熔化性测定、热力学平衡计算、炉渣矿相分析的方法研究了260 t转炉造渣、供氧工艺。结果表明,转炉初期渣熔化温度为1 330 ℃,不利于转炉前期化渣;终渣熔化温度为1 200 ℃,不利于转炉后期的炉衬维护;终点钢水磷含量与渣钢间磷平衡值差距较大,说明转炉吹炼终点动力学条件不足;炉渣中游离氧化钙含量较高,有部分未熔化的石灰。通过优化转炉渣料加入顺序和数量,强化转炉终点氧枪枪位控制、底吹搅拌等技术措施,可获得较高的转炉终点脱磷率和渣-钢间磷分配比,使终点渣-钢间磷含量更接近平衡;终点炉渣发育良好,游离氧化钙含量适中。 相似文献
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《钢铁研究学报(英文版)》2011,(Z2):195-200
In order to reduce the content of oxygen and sulfur in steel, and produce low-sulfur and low-oxygen steel, study on slag has been carried out. Refining slag system of CaO-SiO2-Al2O3 is put forward with the consideration of slag amount from converter, oxidizability of slag and activity of oxygen in molten steel. On this basis, refining slagging system for low-sulfur and low-oxygen steel has been developed combined with the modification of slag from converter and composition control of refining slag in LF treatment process. The results show that oxygen content is not more than 15×10-6, as well as sulfur content is as low as 0.005% in tube blank steel. And it achieves the production of low-sulfur and low-oxygen steel. 相似文献
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