共查询到18条相似文献,搜索用时 343 毫秒
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主要对唐钢FTSC工艺薄板坯连铸过程中间包浸入式水口堵塞的原因进行了工艺分析,从冶金反应的角度分析了耐火材料对水口堵塞的影响机理,并提出了通过提高钢液纯净度、Ca处理等方法进行中间包浸入式水口堵塞的控制,提出了无碳耐火材料的开发设想。 相似文献
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本文对304不锈钢板坯连铸中包浸入式水口堵塞状况进行了探讨,并对水口内壁所形成的明显的三层物质及其形成原因进行了分析,提出了改善水口堵塞的措施。 相似文献
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《钢铁冶炼》2013,40(10):738-747
AbstractDuring the continuous casting (CC) of Al containing resulphurised steel, the submerged entry nozzle is often clogged by high melting point inclusions such as MgO.Al2O3 spinel and CaS. Casting extended for only one to two heats before optimisation. The main objective of the present study is to improve the castability of this steel. A suitable refining slag composition was sought and designed thermodynamically, and a soft blowing system was improved for reducing the dynamics of steel–slag desulphurisation. An optimisation plant trial was conducted on a sequence with four heats. By adopting the optimised refining slag and improved soft stirring operation, the steel castability was improved and the number of CC heats of a single tundish was increased from 1–2 to more than 4. 相似文献
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Nozzle clogging of low carbon micro-alloyed Al killed steel is a crucial castability problem at steelmaking shop. The nozzle clogging index (NCI) was earlier developed by R&D and implemented in the control room of the caster. This parameter gives the clogging status of submerged entry nozzle. In the present work, the root cause for higher NCI was identified by developing a correlation with the upstream parameters. A correction parameter was applied to avoid some misleading NCI values (encountered during the process). Primarily wide variations in bath killing practices by Al bar addition and higher lime addition at TAP were found to have significant impact on NCI during casting. Subsequently, higher Al wire injection at on line purging station and relatively lower lime addition at ladle furnace were also found to have higher NCI. Based on the statistical analysis, the optimum ranges of the upstream parameters were suggested to conduct a plant trial for getting lower NCI. Overall the NCI was reduced from an average value of 0.66 (bad heats) to 0.26 (good heats) for a complete trial casting sequence. 相似文献
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两炉次无取向硅钢XG800WR(/%:0.003~0.004C、0.71~0.75Si、0.32~0.33Mn、0.004~0.007S、0.016P)的炼钢流程为铁水预处理(KR)-210 t顶底复吹转炉-钢包吹氩-RH脱碳精炼-230 mm×1220 mm板坯连铸。53 t中间包钢水过热度为25~30℃,钢包到中间包采用长水口全程吹氩保护浇铸,中间包至结晶器采用浸入式水口浇铸。结果表明,在RH、中间包、结晶器过程中钢中总氧以及夹杂物数量和尺寸均明显降低;但在钢包到中间包过程T[O]、[N]和钢中夹杂物数量增加,说明长水口浇铸过程存在二次氧化。连铸坯中T[O]、[N]平均他分别为11×10-6和30×10-6,显微夹杂物数量平均为4个/mm~2。铸坯中的显微夹杂物主要为3~5 μm的AIN,同时存在少量的MnS、Al2O3·AIN和Al2O3·MgO·MnS。 相似文献