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1钢水温度的测试据统计,1994年因钢水温度波动过大造成的拉坯事故达29炉,约占全年拉坯事故的55%。北满特钢公司二机二流特殊钢水平连铸机生产的铸坯断面为130mm×130mm-185mm×185mm,Φ120-200mm,电炉出钢量:30-40t;中间包容量:7.5t。主要生产钢种:碳素结构钢。合金结构钢、模具钢等钢类。近几年在连铸生产中对钢包、中间包烘烤温度,出钢温度,吹Ar后钢包内钢水温度,抬包至开浇过程温度,中间包内钢水温度等进行了测试。测试的方法主要是在连铸过程用测温枪点测钢水温度和使用红外线测温仪测定钢包、中间包烘烤温度及覆盖渣… 相似文献
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转炉——RH——连铸工艺过程中低碳铝镇静钢的清洁度 总被引:3,自引:0,他引:3
针对宝山钢铁(集团)公司炼钢厂LD—RH—CC生产低碳铝镇静钢连铸板坯的工艺,对钢包、中间包、结晶器中钢水和铸坯的清洁度进行了较为系统的研究,并对进一步改善低碳铝镇静钢连铸坯清洁度的措施进行了讨论。 相似文献
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不同工艺路线超低碳钢洁净度分析 总被引:2,自引:0,他引:2
针对厚板坯和中薄板坯连铸两条工艺路线生产的超低碳钢,采用相关手段分析了钢水从钢包到中间包的二次氧化、稳态和非稳态铸坯全氧、总体夹杂物水平、铸坯大颗粒夹杂物比例等。结果表明,两种工艺路线生产的超低碳钢在稳态浇注时铸坯洁净度基本一致;非稳态浇注时中薄板生产线钢水洁净度低于厚板坯连铸;受中薄板连铸结晶器和水口形状的制约,其水口结瘤现象较厚板坯连铸严重得多。作为中薄板连铸向薄板坯连铸的过渡,若在薄板坯连铸生产线实现正常浇注超低碳钢,进一步提高钢水洁净度、设计合理的浸入水口结构、稳定的连铸操作是亟待解决的问题。 相似文献
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“低温快铸,恒温恒铸”是取得完美铸坯质量及保证连铸机产量的前提条件,中间包钢水温度也就是浇注温度过低或过高,都会给其带来不利影响,因此,在开浇初期,换钢包,浇注末期采用中间包加热是以补偿钢水温度的降低,使钢水温度保持在目标温度附近-等离子加热技术应运而生。 相似文献
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通过对铸坯的低倍检验和中间裂纹部位的电镜扫描,分析了连铸板坯中间裂纹的位置和成因,提出了从钢水成分、二冷配水、铸机设备状况、钢水过热度、拉速等方面的改进措施,使连铸坯中间裂纹的发生率和级别大幅度下降。 相似文献
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26CrMoNbTiB钢由45 t EAF-LF(VD)-Φ80~180mm管坯HCC流程冶炼。该钢各工序的洁净度试验结果表明,LF-VD后钢中氧含量为(8~18)×10-6,平均夹杂物数量最低为2.31个/mm2,连铸坯平均夹杂物数量为3.66个/mm2,≥50μm大型夹杂物平均含量为4.08 mg/10 kg。加强钢包到中间包长水口的密封保护和采用钢包下渣检测装置,提高中间包容量和采用挡渣墙是进一步提高铸坯洁净度的关键工艺措施。 相似文献
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以成都无缝钢管厂水平连铸机的6t双流中间包为研究对象,利用三维传热数学模型并配合以热态模拟实验,对电渣加热情况下中间包内钢水温度变化进行研究,以探索在中间包上采用电渣加热的可行性,并为实际生产提供必要的参数。 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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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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Effects of tundish size,tundish design and casting flow rate on fluid flow phenomena of liquid steel
S. Lpez-Ramírez J. Palafox-Ramos Rodolfo D. Morales M. A. Barrn-Meza Miguel Velzquez Toledo 《国际钢铁研究》1998,69(10-11):423-428
Fluid dynamics of liquid steel in continuous casting tundishes is closely related to tundish volume and geometry, existence of flow control devices and steel flow rate. To study this complex interaction physical and mathematical models were used in the present work. The first one was based in a 1/3 scale water model with injection of tracers and the second one on the solution to the steady state-turbulent Navier-Stokes equations using the K-ε [1] approximation for the turbulent viscosity. When the tundish size is increased from 30 t to 50 t the tracer indicates a strong bypassing in the second case. The mathematical predictions indicate very high fluid velocities along the tundish bottom in agreement with the experimental findings. The employment of turbulence inhibitors promotes a counter-flow that surrounds the incoming stream jet of liquid from the inlet nozzle with steel displacing itself, after leaving this zone, along the upper free surface of the liquid. The addition of well designed baffles complements the action of the turbulence inhibitor to obtain a higher volume fraction under a plug flow pattern giving a softer flow of liquid steel. Besides, the positioning of baffles inside a tundish should be performed according to the steel flow rate. 相似文献
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周应其 《金属材料与冶金工程》2001,(2)
通过对钢液凝固时其气泡和非金属夹杂的形成机理分析 ,以及中间包内钢水流动数学模型研究 ,发现中间包的结构与操作对 2 0 #连铸管坯质量具有较大影响。因此 ,对其结构与操作进行了改进 :改善结构 ,以减少钢水冲击 ,提高钢水滞留时间 ,均匀钢水质量 ;改进钢水流入、流出操作 ,避免钢流与空气的直接接触 ,减少二次氧化 ;降低连铸时的钢水过热度 ,通过这些措施 ,2 0 #钢管坯的质量取得了显著提高 相似文献