• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Iron and Steel Technology Conference >An Optimization Model for Making Alloy Additions During Steelmaking at SSAB Iowa
【24h】

An Optimization Model for Making Alloy Additions During Steelmaking at SSAB Iowa

机译：Ssab Iowa炼钢中制作合金添加的优化模型

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

During steelmaking, different alloying agents are added to liquid steel at various stages to ensure the steel chemistry meets customer specifications. At SSAB Iowa, alloys are generally added to liquid steel in different processing steps until the specification requirements are met: 1. Tapping from the Electric Arc Furnace (EAF): bulk alloys are added into the ladle during tapping. The stirring power of the tap stream helps to quickly homogenize the alloying elements in the ladle, which minimizes subsequent treatment time during the refining process. Therefore, to utilize this advantage offered by adding alloys at tap, mill metallurgists strive to maximize the amounts of alloys added at tap in order to achieve concentrations of dissolved elements as close as possible to the minima required by the specifications. However, the amounts of alloy added are dependent on the variation of tap chemistry due to the scrap mix. If addition amounts are over-estimated, the specified customer chemistry can be exceeded, resulting in production delays since the heat will have to be diluted or diverted. 2. Secondary Refining at the Ladle Metallurgy Furnace (LMF): alloys are trimmed at the LMF to the final specification levels. From a quality point of view, to avoid steel downgrades or diversions to alternate and lower-cost products, the incremental additions of alloys are conducted cautiously until the required concentrations of various elements are achieved. Along with alloy additions, the steel must be completely deoxidized, desulphurized, homogenized and the bath heated to the required temperature before the ladle is shipped to the Vacuum Tank Degasser (VTD) or caster. On time processing of heats at the LMF is very critical to maintaining the continuity of casting, and hence productivity. The steel has to be refined, alloyed to the required chemistry and heated on time to deliver the ladles to the caster to maintain the expected productivity per the schedule. The time available to the LMF operators to adjust the heat within specification is even shorter when casting wider products because of higher casting throughput. In addition, some of the heats tapped from the EAF may require longer processing time at the LMF due to non-optimal quality as a result of slag carryover. These conditions may complicate the judgement of the operators, and hence cause the chemistry of the steel to deviate from customer specifications. The choice of an optimal combination of alloys for trim additions in the ladle is based on operator judgment, which creates a challenge in itself to consistently maintain an optimal and cost-effective operation. 3. Vacuum Treatment in Vacuum Tank Degasser (VTD): depending on the steel specification, some steel may require final alloy trims after vacuum degassing. As a final stage, any miscalculations in alloy trims will be very costly. To minimize the occurrence of deviations of steel chemistry from specifications, and to produce steel with optimal quality and optimize alloy additions with the purpose of ensuring cost savings, SSAB Iowa initiated a project to develop a comprehensive alloy addition model in 2017. In addition to cost savings, the model was intended to improve liquid steel yield and increase productivity. This paper discusses features of the new alloy addition model and its applications at the mill.
机译：在炼钢期间，在各个阶段将不同的合金化剂加入液体钢中，以确保钢化学符合客户规格。在SSAB IOWA，通常在不同的加工步骤中将合金加入液体钢，直到满足规格要求：1。从电弧炉（EAF）点击，在攻丝期间将散装合金加入钢包中。龙头流的搅拌力有助于快速均匀化钢包中的合金元素，这在精炼过程中最小化后续的治疗时间。因此，为了利用通过在龙头中添加合金的合金提供的这种优势，磨料冶金师致力于最大化在水龙头时添加的合金量，以实现尽可能接近的溶解元件的浓度，以便如规格所需的最小值。然而，添加的合金量取决于由于废料混合物而取决于抽取化学的变化。如果过度估计添加量，则可以超过指定的客户化学，导致生产延迟，因为热量必须稀释或转移。 2.钢包冶金炉（LMF）中的二次精炼：合金以LMF修剪至最终规格水平。从质量的角度来看，为了避免钢制下降或分流以交替和低成本的产品，合金的增量添加致命化，直到实现各种元素的所需浓度。除了合金添加，钢必须完全脱氧，脱硫，均质化，并将浴液加热到所需温度之前，钢包运送到真空罐脱气剂（VTD）或脚轮。按时加工LMF的热量对于维持铸造连续性非常重要，因此是生产力。钢必须精制，合金化到所需的化学并按时加热，以将钢包送到施法者以维持按时间表的预期生产力。 LMF运营商可用于调节规格内的热量的时间更短，因为铸造吞吐量较高。另外，由于炉渣携带的结果，从EAF点击的一些热量可能需要在LMF处的更长的处理时间。这些条件可能使操作员的判断复杂化，因此导致钢的化学偏离客户规格。在钢包中选择用于修剪的合金的最佳组合是基于操作员判断，这本身就是挑战，以始终如一地保持最佳和成本效益的操作。 3.真空罐脱气器（VTD）的真空处理：取决于钢规格，一些钢在真空脱气后可能需要最终合金饰边。作为最后阶段，合金修剪中的任何误差都将非常昂贵。最大限度地减少钢化学的偏差从规格中的偏差，并以最佳的质量生产钢，并优化合金补充，以确保节省成本，SSAB IOWA启动了2017年开发综合合金添加模型的项目。除了成本节省，该模型旨在提高液体钢产量并提高生产率。本文讨论了新的合金加法模型及其在轧机的应用的特点。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号