摘要:
对325 mm×280 mm大方坯在开坯、加热炉加热、堆垛缓冷和水除鳞等生产流程的温度变化规律进行了研究。结果表明:开坯到160 mm×160 mm热轧坯时,角部温度已经下降到990℃,表面中心温度下降到1 012℃。冷装热轧坯经过50 min的加热后温度基本达到1 000℃,热轧坯开坯后直接入炉经过40 min的加热后热轧坯温度已经达到1 060℃以上,基本满足了轧制的要求。铸坯经过堆垛冷却48 h后,堆垛表层的铸坯中心温度下降到20℃左右,堆垛中心的铸坯中心温度下降到80℃左右。冷却速率自顶向下逐渐减慢,堆冷铸坯的冷却速率为8.3~15.3℃/h,铸坯的平均冷却速率为10.44℃/h。热轧坯在经过水除鳞段后,铸坯角部温度下降到1 053℃,边部中心温度下降到1 055℃,整个水除鳞阶段热轧坯的温降幅度在15℃左右。
关键词:
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大方坯 /
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温度变化 /
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堆垛缓冷 /
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水除鳞 /
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加热
Abstract:
The temperature evolution through breakdowning,reheating,stack cooling and water descaling for bloom with dimension of 325×280 mm2 had been studied by means of numerical simulation in this paper. The calculations show that the temperature at corner of transferred bar after 9-passes breakdowning to 160×160 mm2 billet is 990 ℃,while it decreases down to 1 012 ℃ for middle section of billet surface.50 minutes reheating can bring the cold charged billet to the temperature of 1 000 ℃,while 40 min utes is sufficient to reheat the hot charged billet up to 1 060 ℃ required for rolling. For the slab after stack cooling for 48 hs,center temperature of slab on the top of stackcooled down to about 20 ℃,while for the slab at middle of stackthat temperature was about 80 ℃. Cooling rate of slab locating from the top to down of stack gradually slows down varing from 8.3 to 15.3 ℃/h and average value is 10.44 ℃/h. Regarding hot rolled billet after descaling section,corner temperature was about 1 053 ℃,and edge center temperature approximates 1 055 ℃. Temperature change through descaling is about 15 ℃.
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