武钢BOF-CSP耐候钢的冶炼工艺探讨

通过对比国内采用CSP生产线生产耐候钢的钢厂的冶炼工艺,针对武钢首次引进CSP生产线、无生产耐候钢实践经验的现状,结合耐候钢生产的工艺特点,主要从转炉冶炼和炉外精炼两方面入手,对耐候钢的生产工艺进行探讨与研究,为武钢CSP厂生产耐候钢提供参考.     

含磷耐候钢冶炼连铸工艺研究

介绍了合金成分对耐候钢性能的影响,并通过对含P耐候钢冶炼过程氧化反应的分析,建立了合理的降C保P控制模型。实践证明,降C保P控制模型的建立,即采取LF精炼、Al脱氧、吹氩等工艺提高了钢水的纯净度,达到了预期效果。     

梅钢转炉低成本冶炼耐候钢SPA-H

为发挥梅钢中磷铁水的优势,充分利用磷资源,降低成本,利用梅钢现有转炉模型计算了石灰加入量,分析了梅钢转炉冶炼过程中熔池磷含量与吹氧量的关系及脱磷反应的热力学条件,并据此采取了减少石灰加入量和低氧枪枪位操作等措施,降低了转炉终点磷的分配比,生产出低碳和高吹炼终点磷含量的钢水,降低了冶炼物料消耗和合金消耗,使转炉冶炼含磷耐候钢SPA-H等钢种成本低于其他钢种.     

试制09CrPV钢的工艺及效果

利用在全连铸生产条件下进行工业性试验的大量数据和资料，着重总结分析２０ｔ转炉生产０９ＣｒＰＶ耐候钢的冶炼，脱氧合金化及钢水炉外吹氩，喂线处理的操作工艺和经验。     

安钢150 t转炉高磷耐候钢生产实践

结合现场生产实际,从转炉冶炼原材料条件、造渣制度、供氧制度、操作控制等方面分析了高磷耐候钢冶炼技术特点。生产实践表明:在正常的冶炼条件下,采用相对低的碱度2.2~2.5,并稳定炉渣中的FeO含量在15%以内是冶炼高磷耐候钢的关键;冶炼工艺优化后转炉出钢终点磷w(P)%平均可达到0.055%的水平。     

窄带SPA—H耐候钢转炉冶炼的开发

采用“转炉-窄带”工艺路线开发生产SPA—H耐候钢带替代同品种“电炉-窄带”。研究转炉冶炼SPA—H耐候钢带的内控成分，探讨为改善力学性能、中间裂纹而采取的工艺措施。     

SPA—H高强度耐候钢的工艺实践

唐山不锈钢有限责任公司在SPA—H高强度耐候钢生产过程中,采用转炉冶炼、LF精炼、连铸等工艺,达到了钢材的质量要求。     

高炉铁水冶炼超纯铁素体不锈钢脱磷工艺选择

磷是钢中有害杂质之一,含磷钢在常温或更低的温度下使用时易发生脆裂.超纯铁素体不锈钢要求在恶劣环境下长时间工作,因此要严格控制钢中硫、磷等有害元素及夹杂物的含量.采用高炉铁水冶炼超纯铁素体不锈钢时,需对铁水进行深脱磷处理.铁水罐喷吹脱磷工艺能够满足超纯铁素体不锈钢质量要求,能够适应不同不锈钢品种对铁水量的不同需求,具有金属收得率高、设备简单、投资省等优点.高炉铁水冶炼超纯铁素体不锈钢配以铁水罐喷吹脱磷工艺比转炉脱磷工艺具有明显的优势.     

转炉-LF和铁水预处理-转炉-钢包吹氩对耐候钢冶金质量的影响

进行了60 t转炉(钢水温度1653℃)-LF精炼(渣碱度2.5～3.0、喂Al线、吹氩)和铁水预处理([S]≤0.010%)-60 t转炉(钢水温度1670℃,出钢过程加80～100 kg精炼渣)-钢包喂A1线、吹氩≥8 min两种工艺冶炼耐候钢SPA-H(%:≤0.12C、0.30～1.25Cr、0.25～0.55Cu)的试验。62炉生产结果表明,有LF精炼炉次吹氩前[O]37.7×10^-6,喂丝量25 kg,平均[S]0.014%,无LF精炼吹氩前[O]53.3×10^-6,喂丝量33.9 kg,平均[S]0.017%,两种工艺生产的耐候钢力学性能和夹杂物级别均达到要求,但无LF工艺有利于提高生产率,降低物料消耗。     

电炉冶炼喷吹系统关键参数的试验优化及效益分析

为解决当前高钒铁合金炉外冶炼工艺落后、工序设计不合理,最终导致的钒回收率低、产品质量不均以及成本高的问题,在对高钒铁炉外精炼工艺流程进行综合分析的基础上,采用高试验方案对喷吹工艺对炉外冶炼工艺的改善效果进行对比分析,并重点研究了喷吹料粒度和喷吹量对喷吹效果,为今后电炉冶炼工艺的优化提供了理论基础。     

EAF+LF+VOD/VHD冶炼超级双相不锈钢工艺实践

介绍了抚钢超级双相不锈钢冶炼工艺流程,进行了VOD炉真空吹氧去碳、包底吹氮、二次造渣及喂线处理生产实践。研究表明,通过设定合理的吹氧、吹氮工艺,实现了低碳含量、准确氮含量的控制。通过在还原过程中调整合适的炉渣碱度,对钢液进行喂线处理,强化脱硫脱氧,从而改性夹杂物形貌,以确保钢液精准的化学成分及良好的纯净度控制,为热加工创造有利条件。     

转炉顶吹与复合吹炼条件下冶金效果的对比

对抚顺新钢铁公司顶吹转炉复合吹炼改造前后冶炼工艺效果的差异进行了对比研究,结果表明：顶底复合吹炼工艺在冶炼终点的碳、氧控制水平较好[终点碳含量为0.06%～0.10%时（质量分数,下同）,碳氧积为0.0026～0.0029],终点炉渣组元结构组成方面较合理,终点钢水氮含量较低（约16×10-6）。采用复吹工艺后,转炉终...     

气体增氮法冶炼钒氮微合金钢

从理论上分析了钢液增氮的热力学、动力学影响因素,进行了BOF＋RH双联吹氮冶炼钒氮钢试验。结果表明,转炉底吹、RH喷吹均能有效增加钢液氮含量。RH真空度两段式控制既能满足控氢要求又能实现钢液搬出时较高的氮含量。BOF＋RH双联吹氮气工艺可以不加含氮合金冶炼钒氮微合金钢。     

Decarbonization and chromium conservation thermodynamics of partial CO2 instead of Ar or O2 in AOD furnace

Decarbonization and chromium conservation technology is mainly achieved by blowing O2 and Ar during the traditional AOD furnace smelting process. The CO2 emissions per ton of steel production in the steel industry are about 1. 57t. If the CO2 emissions can be collected and recycled in the steel production process, it can not only save energy and reduce emissions, but also reduce the cost of smelting. The feasibility of using CO2 instead of Ar or O2 to be injected for smelting stainless steels was verified by thermodynamic calculations. The reaction limits of the different carbon content, the rising and falling temperature of elemental oxidation, the reaction rate under different ratios of CO2 injection, the depth of decarburization, and the result of chromium retention were also calculated. The thermodynamic mechanism of blowing CO2 to replace O2 decarburizing and protecting chromium was analyzed. The results show that blowing CO2- O2 mixed gas in high carbon zone is conducive to decarbonization and chromium conservation in the AOD smelting process. With the increase of CO2 ratio, the effect of chromium retention is enhanced whereas the decarburization rate is reduced. When the CO2 injection amount is increased, the decarburization reaction rate in the molten pool is too slow, causing the molten pool temperature to be low, and the CO2 injection ratio should be controlled between 20 vol.% and 40 vol.%.     

Research on molten flow simulation of 30t VOD ladle smelting stainless steel

30tVOD ladle smelting stainless steel was used as the process background, and the numerical and physical simulations were applied to investigate the flow and mixing characteristics of molten steel during the 30tVOD refining process. The cold experiment was employed to investigate the mixing behaviors of molten steel under the bottom and combined blowing systems. The flow features of molten steel were analyzed by numerical simulation with different blowing conditions. The results show that when the plug position of the ladle is located on 1/4R(R is the radius of ladle bottom), whether top- bottom blowing or bottom blowing, the molten steel is mixed well, and mixing time compared to the central position is reduced by 46% and 14% respectively. In addition, the comparison of flow field and turbulent kinetic energy of the molten steel show that when the bottom blowing position is 1/4R, the flow direction of the molten steel caused by the top blowing and the bottom blowing is better near the bath surface, and active volume ratio of molten steel is higher than that of other blowing positions. Current results were validated in industrial VOD furnace, which indicates that 1/4R is regarded as the optimum injection position for combined stirring.     

优化炼钢模型控制超低碳钢转炉冶炼终点

超低碳钢终点氧含量直接关系到后续工艺处理及最终产品质量。包钢金属制造公司对转炉冶炼过程底吹、副枪模型系统计算参数进行了优化,提高了冶炼过程底吹供气强度,加强底吹对熔池搅拌,同时针对超低碳钢制定了底吹供气模式。结果表明,采取以上工艺,能够降低终点氧含量,提高超低碳钢终点碳含量、温度、氧含量命中率,为后续工序提供较好的钢水条件。     

LD-RH-CC工艺生产H08A的实践

通过优化H08A钢冶炼工艺路线,转炉采用双渣法操作,放钢过程不加合金,吹氩、RH炉脱氧、脱气、升温等处理,节约了脱氧剂用量,降低了生产成本,钢水流动性好,铸坯没有皮下气泡缺陷。     

顶吹氧平炉炼钢造渣剂的开发与应用

顶吹氧平炉炼钢熔炼过程中造渣是重要的，由于平炉炼钢供氧强度大，一氧化碳反应激烈，钢液降碳快，熔炼时间短等，给造渣带来困难。采用新型熔剂－－钛渣作造渣剂，可以解决这个问题，经过三年多的试验研究，取得了大量的数据，结果使用钛渣作造渣剂，可以 降低熔渣熔点，改善熔渣流动性，降低铁料消耗，提高炉底寿命。