共查询到18条相似文献,搜索用时 140 毫秒
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通过对"转炉-出钢渣洗-炉后加化渣促进剂-软吹-连铸"工艺和"转炉-LF—软吹-连铸"工艺过程进行取样,研究了出钢渣洗对低碳铝镇静钢SPHC钢成分及成本的影响。结果表明,两种工艺均可满足SPHC钢碳、硫、磷及全氧含量等成分要求,且渣洗工艺更有利于减少增碳。渣洗炉次与经LF炉次钢水全氧含量相差仅1.5×10-6,两者洁净度相近,可保证连铸过程的顺利多炉连浇。同时,渣洗工艺可显著降低生产成本。 相似文献
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介绍了天铁热轧板公司应用直上渣洗工艺生产SPHC的过程.通过转炉出钢过程中直接进行渣洗,同时吹氩精炼以促进夹杂物上浮和净化钢液,然后直接进行连铸,可解决提炼过程易增碳和增硅的问题,钢水流动性好,同时降低了冶炼成本. 相似文献
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通过对转炉终点、出钢下渣质控点的控制以降低钢水初始氧;采用LF快速成渣、稳定白渣时间、钙处理等去除夹杂物;并在连铸加强保护浇注以减少钢水二次氧化以及留钢操作,避免卷渣影响钢水纯净度等各工序的关键质控点控制,最终实现42CrMoA合金结构钢的开发,且钢中非金属夹杂物等级满足要求。 相似文献
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分析了转炉炼钢过程中转炉冶炼终点氧气射流的搅动、出钢时间增加、钢水传质系数的增加、钢包炉电弧裸露和连铸保护浇注不良等因素对钢水增氮的影响。 相似文献
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介绍了天铁热轧SPHC钢种生产工艺优化过程。对原辅料消耗高,浇注困难等问题进行了分析研究。通过采取优化转炉操作、吹氩、渣洗料等措施,满足了连铸对钢水可浇性的要求,提高了连铸水口的通钢量,减少了断浇的次数,降低了工序成本。 相似文献
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介绍了迁安轧一钢铁集团炼钢厂生产低碳低硅铝镇静钢SPHC的生产实践。通过优化生产工艺,控制转炉出钢过程中下渣量,保护浇铸,LF炉精炼等措施,使钢水成分得到精确控制,钢中夹杂物大量减少,钢水的可浇性提高,铸坯表面及内部质量均达到了标准要求,满足了用户需求。 相似文献
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钢包顶渣的改质是防止钢水二次氧化、钢液深度脱氧、优化钢液和夹杂物去除的重要工艺方法。120 t转炉+LF +板材生产线生产低碳铝镇静钢SPHC和330CL时,LF精炼采用碳铝改质剂(/%: ≥35Al2O3,15~30C,5~15Al, ≤5SiO2,6 ~12CaF2 )较无碳改质剂 (/%:40~ 60Al2O3, ≥20A1,2~ 10CaO,≤10SiO2)钢水增氮量从0.000,5% ~0.0015% 降至≤0.001%,脱硫率从40%增至45%。 相似文献
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�Զ�ΰ����������������£���С�� 《钢铁研究学报》2017,29(12):997-1005
RH oxygen top- blowing for raising temperature should be avoided to improve the cleaniness of IF steel as far as possible, which made the end point temperature of converter higher and then dephosphorization in converter became difficult. Thermodynamics and dynamics of dephosphorization process in converter were calculated to study the relationship of phosphate partition ratio to compositions of molten steel, slag, temperature in molten steel based on slag- remaining and double slag process. Through changing the first deslagging time and the composition of slag,then serial sampling from molten steel and slag in industrial production experiments, the behavior of phosphorus in molten steel was studied and then the main measures obtaining higher phosphate partition ratio in slag- remaining and double slag process are: small- sized scrap or thin steel sheet should be used to increase FeO content in slag and prevent molten steel temperature increase when oxygen blowing in converter begins. Slag with high phosphorus content should be poured when amount of oxygen blowing reachs 40% of the total; FeO content in slag should be increased to assure the mobility of slag and then reduce rephosphorization from slag to steel when amount of oxygen blowing is greater than 40% and less than 80% of the toal; the end- point slag with 4. 0 basicity and 18 mass%-20 mass% FeO content and molten steel temperature should be controlled. 相似文献