共查询到19条相似文献,搜索用时 109 毫秒
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对八流40 t中间包烘烤及浇钢过程的包壁与钢液温度进行了数值模拟计算与20CrMnTiH钢200 mm×200 mm坯连铸现场实测。结果表明,模拟计算烘烤期间中间包耐材升温缓慢,浇钢后中间包内衬耐材升温加快,第3炉外壁温度397℃,达到热平衡;第2炉结束时,计算两侧与中部钢液温度较第1炉对应位置分别升高5.2、1.5℃,计算边流与中部流钢液温差4.8℃,实测第2炉边流间与中部流间钢液温度相差4℃,中间包钢液温度均匀稳定,计算值与实测值趋势一致;烘烤包温度由900℃提高至1000℃时,第1炉中间包钢液温降减慢,水口出钢温度略增,各流间温差减少。 相似文献
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为了进一步降低电炉钢水出站温度及中间包钢水过热度,减少精炼电耗和其他消耗,提高铸坯质量,根据一炼钢厂三项攻关协调会议要求,成立降低电炉钢水温度测试及攻关小组,探索钢水从出站到连铸整个浇铸过程中钢水温度变化规律,确定中间包允许浇铸最低钢水温度,分阶段降低精炼钢水出站温度和中间包钢水过热度,45钢和20MnSi出站温度达到1580℃和1590℃,中间包过热度低于35℃。 相似文献
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轴承钢GCr15连铸钢水流动性差的原因和改进措施 总被引:1,自引:0,他引:1
GCr15连铸钢水流动性差,主要表现为钢包钢水流不出或中间包水口内钢水流量小.生产统计数据表明,随连浇炉次平均[AI](0.01%~0.03%)增加,[Ti](0.003%-0.007%)降低,Mn/Si(1.45~1.60)增加,钢水的流动性提高,此外LF精炼周期长(80 min),中间包钢水过热度低(25℃),不利于提高钢水流动性.提高钢水的洁净度,适当提高[A1]和Mn/Si,控制精炼时间和中间包钢水过热度,可有效提高GCr15钢水的流动性. 相似文献
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采用SolidWorks、ANSYS等软件对连铸机不对称浇铸时中间包钢液流动及温度特性进行研究,发现铸机不对称浇铸会对中间包流场产生重要影响,从而会导致中间包温度分布变化。关闭铸机某一侧某一流进行浇铸时,该侧中间包钢液流动速度会降低,同时在该侧会形成较多、面积较大的回流区,而中间低温钢液区明显向另一侧偏移,该现象以关闭铸机最边部流时更加明显(相比于中间流)。 相似文献
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建立了钢水在中间包内温降的数学模型,这不仅可以计算钢水在整个浇注过程中温降规律,为控制浇注提供依据,而且也可以计算中间包衬的温度场,为中间包的设计提供参考。 相似文献
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控制中间包内钢水温度变化是提高生产率和产品质量的有效方法之一。中间包等离子加热能够弥补浇注过程中钢水温降,稳定钢水温度,提高铸坯质量。对某厂中间包等离子加热进行工业试验研究。采用三中空石墨电极等离子加热装置对中间包内钢水进行加热。通过两组中间包等离子加热试验,探究等离子加热对中间包内钢液温度变化和钢液成分及夹杂物特征的影响。结果表明,等离子加热中间包内钢水升温效果明显,升温速率可实现0.8 ℃/min,同时也能够使钢水温度保持稳定;等离子加热后中间包内钢水全氧含量下降,氮含量基本不变,碳含量略有升高;加热后钢液中夹杂物的数密度明显降低,分别下降了7.43%和19.68%。中间包等离子加热可稳定中间包内钢液过热度,促进了氧化物夹杂的上浮去除,提高了铸坯质量。 相似文献
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Aiming at the characteristics of the practical steelmaking process, a hybrid model based on ladle heat sta- tus and artificial neural network has been proposed to predict molten steel temperature. The hybrid model could over- come the difficulty of accurate prediction using a single mathematical model, and solve the problem of lacking the consideration of the influence of ladle heat status on the steel temperature in an intelligent model. By using the hybrid model method, forward and backward prediction models for molten steel temperature in steelmaking process are es- tablished and are used in a steelmaking plant. The forward model, starting from the end-point of BOF, predicts the temperature in argon-blowing station, starting temperature in LF, end temperature in LF and tundish temperature forwards, with the production process evolving. The backward model, starting from the required tundish tempera- ture, calculates target end temperature in LF, target starting temperature in LF, target temperature in argon-blo- wiag station and target BOF end-point temperature backwards. Actual application results show that the models have better prediction accuracy and are satisfying for the process of practical production. 相似文献
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Xue‐min Yang Song‐xia Liu Jin‐sha Jiao Meng Zhang Jian‐ping Duan Liang Li Cheng‐zhi Liu 《国际钢铁研究》2012,83(3):269-287
In order to obtain the optimal structural parameters of the dug arch or round hole(s) at dam bottom in an 18–20 tons asymmetrical T‐type single‐strand continuous casting tundish, the flow field profiles and temperature profiles of molten stainless steel in the tundish with arch or round hole(s) at dam bottom have been investigated using hydrodynamic modeling coupled with mathematical simulation. The optimal structural parameters of arch hole(s) at dam bottom can be obtained from hydrodynamic modeling as that two arch holes with 30 mm as height and 50 mm as radius are symmetrically dug at dam bottom with the distance between arch hole center and dam center as 205 mm; or the optimal structural parameters of round hole(s) can be recommended as that one round hole with 70 mm as diameter is dug at left of the dam bottom with the distance between hole center and dam center as 205 mm. The results of mathematical simulation suggest that digging arch or round hole(s) at dam bottom with above‐mentioned structural parameters cannot obviously induce negative effects on streamlines and velocity vector profiles of molten stainless steel in the tundish by short circuit flow via arch or round hole(s) at dam bottom. The calculated temperature drop of molten stainless steel between the submerged ladle shroud and submerged entry nozzle in the tundish with arch or round hole(s) at dam bottom is about 3.0 K, the maximum temperature drop of molten stainless steel in the tundish is about 6.0 K. 相似文献