韶钢大转炉一次拉碳不等样出钢工艺的应用

介绍了韶钢大转炉一次拉碳不等样出钢的冶炼工艺,实践证明该工艺能有效地缩短冶炼周期,避免了由倒炉和等样产生的热量损失。针对该工艺个别炉次出现成分、温度不均匀和该工艺应用初期石灰、矿石消耗增加的情况提出了改进措施。

SWRCH22A冷镦钢转炉冶炼一次拉碳工艺研究

冶炼冷镦钢采用一次拉碳工艺,出钢碳的质量分数应控制在0.08%～0.13%,并减少倒炉次数,能有效控制钢中氧含量,减少脱氧合金化过程中Al2O3夹杂物的形成,提高钢水的浇注性能和钢的质量。通过优化双渣操作,控制吹炼前期熔池动力学条件,确保一次倒炉磷的质量分数不大于0.015%,分析转炉过程控制对终点碳和温度判断的影响,并就相关影响因素采取调整措施,加强操作工培训,把握吹氧提枪时机和位置,确保一次倒炉温度控制在1 620～1 660℃,碳的质量分数控制在0.08%～0.13%,可实现冶炼SWRCH22A冷镦钢时转炉一次拉碳出钢合格。

声呐化渣结合煤气分析仪应用实践

针对90 t顶吹转炉冶炼过程中依靠人工经验化渣,影响转炉生产效率的问题,结合使用了声呐化渣系统和煤气分析仪,并优化了喷溅指数、加料方式等工艺参数,采取上述措施后,转炉一次拉碳合格率提高了9.6%,跑渣率下降了2.5%,化渣合格率提高了35%,转炉平均冶炼周期降低2 min/炉,提高了转炉的冶炼效率。

提高转炉产能的生产实践

分析影响转炉产能的主要因素,阐述武钢第一炼钢厂通过增加转炉装入量、提高转炉供氧强度、采用一次拉碳等工艺优化措施,来充分挖掘转炉产能的生产实践。

5G智能化炼钢系统应用实践

为了提高炼钢工序生产效率和钢水质量,使炼钢工序向智能化精细化生产转型升级,进行了基于5G通信技术的智能化炼钢系统的建设,应用后提高了炼钢工序控制水平,钢水一次拉碳命中率由92.3%提高至96.5%,提高了烟气中一氧化碳回收率,降低了原材料损耗和生产能耗,减少有害废气废物的排放,取得较好的经济与环保效益。

高钙石灰在转炉的应用及研究

高钙石灰较普通石灰具有CaO高、SiO2低,活性度大等优势,为了研究高钙石灰在转炉的应用效果,本文对高钙石灰在转炉试验中的一次拉碳情况、终渣情况两个方面进行数据对比、分析。结果表明:使用高钙石灰炉次较普通石灰终渣FeO含量降低5.01%,钢水收得率高,对一次拉碳S、P合格率、终渣碱度几乎没有影响。同时在保证脱磷脱硫效率前提下,对缩短冶炼周期,提高炉龄等方面均有积极作用。

Tensile behaviors of ecological high ductility cementitious composites exposed to interactive freeze-thaw-carbonation and single carbonation

To explore the tensile property parameters in the structural design of bridge deck link slabs made by ecological high ductility cementitious composites (Eco-HDCC), the tensile properties of Eco-HDCC exposed to interactive freeze-thaw-carbonation cycles and single carbonation cycles were studied. The carbonation front of Eco-HDCC was determined by X-ray diffraction and differential scanning calorimetry-thermal gravimetric methods. Results indicate that the carbonation front of Eco-HDCC after interaction tests is deeper than that of Eco-HDCC after single carbonation tests. In addition, the ultimate tensile strength for Eco-HDCC shows an increasing trend after the interaction of 1 to 5 cycles compared with that of virgin specimens, while the ultimate tensile strength decreases after the interaction of 10 to 15 cycles. For single carbonation tests, the ultimate tensile strength of Eco-HDCC increases as cycles increase. After being subjected to interaction and single carbonation environments, both the ultimate tensile strain and tensile strain energy of Eco-HDCC decrease as cycles increase, and the decrease degrees of Eco-HDCC after interaction cycles are larger than those of Eco-HDCC after single carbonation. For general consideration, the tensile stress-strain relationship of Eco-HDCC after the interaction of 15 cycles can be adopted in the design of bridge deck link slabs for the purpose of safety.