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脱氧工艺对低碳铝镇静钢洁净度的影响 总被引:1,自引:0,他引:1
以KR→BOF→RH→CC流程生产的低碳铝镇静钢,在转炉流程后采用2种不同脱氧工艺:出钢添加部分铝预脱氧,RH真空循环利用钢中碳脱氧,后加铝强脱氧(工艺Ⅰ);出钢加铝强脱氧,RH真空循环处理(工艺Ⅱ)。对两种脱氧工艺出钢后的顶渣改质效果进行对比分析,结合全氧分析,利用ASPEX扫描电镜对两种工艺下RH真空处理过程的夹杂物和铸坯内外弧表层夹杂物的形貌、成分、数量和尺寸进行系统研究。结果表明,工艺Ⅱ的顶渣改质效果优于工艺Ⅰ;经过RH真空处理,两种工艺均可以明显地去除20 μm以上的夹杂物;在RH精炼阶段、铸坯及热轧板表层的夹杂物尺寸、数量密度以及总氧控制方面,工艺Ⅱ优于工艺Ⅰ。 相似文献
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介绍了莱钢在现有工艺设备的基础上,针对LF—RH双联工艺存在的主要问题进行了研究与优化。对LF炉工艺功能进行简化与优化,使其具备快速造白渣、脱氧功能,有效去除渣中氧含量,确保渣中(FeO+MnO)小于1.5%;运用温度控制模型,实现温度控制精准化,有效降低了RH吹氧率,缩短了RH冶炼周期;RH采用真空钙处理技术、增上软吹工艺以及优化环流模式,提高了钢水纯净度,成功解决了连铸机套眼问题;优化RH脱氢工艺。稳定钢中氢含量,同时有效缩短RH处理周期,实现了RH冶炼高效化;形成了一套完整的LF—RH工艺控制技术.取得良好的冶金效果。 相似文献
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IF钢碳含量不稳定因素分析 总被引:1,自引:0,他引:1
针对攀钢IF钢RH处理过程终点碳含量偏高及不稳定的问题,对IF钢生产工艺过程进行了跟踪调查.结果表明:RH处理前钢水[C]及a[O]、真空度、脱碳时间、钢包耐火材料及合金增碳等是影响IF钢碳含量偏高及不稳定的主要因素.RH进站[C]含量高于0.045%,终点碳含量与进站碳含量成正比关系;最小真空度越低,脱碳时间越长,终点碳含量就越低.为保证攀钢IF钢碳含量合格,应将RH进站钢水碳含量控制在0.030%~0.045%、a[O]控制在(500~700)×10-6,加强设备监控与维护以维持足够的深真空时间和进一步降低真空度.为减少RH处理后期钢液增碳,在保证真空室不结冷钢的前提下应使用渣线部位不含碳的钢包及低碳合金. 相似文献
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分析了影响RH脱碳的因素,在试验生产中采取了快速提高RH真空度、加快初期脱碳反应速率和增大驱动气体流量等强化中期脱碳的措施,大幅降低了RH处理结束时钢水中碳含量.分析表明,钢包顶渣氧化性强是钢水中Als损失和T[O]高的主要原因. 相似文献
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摘要:研究了RH脱氧方式(铝脱氧,先铝后硅;硅脱氧,先硅后铝)对含铝电工钢洁净度、渣成分、夹杂物演变及连铸过程的影响。2种脱氧方式下钢包顶渣的氧化性相似,热力学计算表明硅脱氧的顶渣对铝酸盐夹杂物的吸收能力强于铝脱氧渣。铝脱氧钢中夹杂主要为Al2O3 CaO CaS复合氧化物,硅脱氧钢中夹杂物主要是Al2O3。2种脱氧方式下,热轧钢卷中的典型夹杂物都是AlN、MnS和复合铝酸盐。由于脱氧方式和钢中N、S含量的差异,铝脱氧热轧卷中夹杂物的含量是硅脱氧的2~3倍,这与理论的预测结果完全吻合。由于钢液中Ca含量不同,硅脱氧的钢水在CSP连铸过程中会引起中包塞棒上涨,因此建议在传统的连铸工艺中采用硅脱氧,在CSP工艺中采用铝脱氧。 相似文献
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A novel three‐dimensional mathematical model proposed and developed for the non‐equilibrium decarburization process during the vacuum circulation (RH) refining of molten steel has been applied to the refining process of molten steel in a 90‐t multifunction RH degasser. The decarburization processes of molten steel in the degasser under the conditions of RH and RH‐KTB operations have been modelled and analysed, respectively, using the model. The results demonstrate that the changes in the carbon and oxygen contents of liquid steel with the treatment time during the RH and RH‐KTB refining processes can be precisely modelled and predicted by use of the model. The distribution patterns of the carbon and oxygen concentrations in the steel are governed by the flow characteristics of molten steel in the whole degasser. When the initial carbon concentration in the steel is higher than 400 · 10−4 mass%, the top oxygen blowing (KTB) operation can supply the oxygen lacking for the decarburization process, and accelerate the carbon removal, thus reaching a specified carbon level in a shorter time. Moreover, a lower oxygen content is attained at the decarburization endpoint. The average contributions at the up‐snorkel zone, the bath bulk and the free surface with the droplets in the vacuum vessel in the refining process are about 11, 46 and 42% of the overall amount of decarburization, respectively. The decarburization roles at the gas bubble‐molten steel interface in the up‐snorkel and the droplets in the vacuum vessel should not be ignored for the RH and RH‐KTB refining processes. For the refining process in the 90‐t RH degasser, a better efficiency of decarburization can be obtained using an argon blow rate of 417 I(STP)/min, and a further increase in the argon blowing rate cannot obviously improve the effectiveness in the RH refining process of molten steel under the conditions of the present work. 相似文献
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Jian Cui Zongze Huang Zhigang Ma 《宝钢技术》2008,1(1):1-5
With the strong demand for the development of automobile sheets, tin plates, household appliances, silicon steel, pipeline steel and other products as well as for the quality improvement of steel products, remarkable progress has been made in RH refining technology and equipment design since Baosteel began production more than 20 years ago. The vacuum degassing ratio of Baosteel has jumped from 35% in the initial stage when Baosteel began production, to the current ratio of approximately 60%, and will soon reach 75% in the near future. The independent innovations in RH refming technology in Baosteel, such as RH equipment optimization, vacuum decarburization, inclusion control, deoxidation, desulfurization, rhythm adjustment between primary steelmaking and continuous casting, the high efficiency of the RH refining process, and other aspects of RH technology, have all effectively met the requirements of developing new steel products, quality improvement and logistical control. Complete sets of RH equipment and refining technology have been successfully exported to the domestic steel plants. In the future, Baosteel will make further efforts to improve efficiency, stabilize production and quality, and realize special line production, so that the RH degasser will play a greater role in Baosteel. 相似文献