摘要
研究掌握铸坯凝固冷却过程中氧化层的生成及其对连铸坯冷却降温的影响,对连铸工艺制度的优化、铸坯表面温度的准确监测、热装热送与轧制工艺参数的确定具有重要意义。实验测试了不同温度下45号钢连铸坯的氧化过程,在此基础上建立了铸坯表面的氧化动力学模型,并且实验研究了氧化层厚度对连铸坯冷却降温过程的影响。结果表明,在连铸坯氧化活化期内,铸坯温度越高,氧化越快,但不同温度下最终形成的表面氧化层厚度相近;铸坯氧化动力系数为exp(9.77),氧化层表观活化能为9 323.07 kJ/mol。铸坯温度与氧化层厚度及冷却时间的定量关系表明:铸坯氧化层越厚,铸坯降温越慢;氧化层厚度每增加0.1 mm,平均降温速率降低1.051℃/min。
It is of great significance to study and master the formation of oxide layer during solidification and cooling process of slab and its influence on cooling of slab for optimization of continuous casting process system, accurate monitoring of slab surface temperature, determination of hot charging, hot delivery and rolling process parameters. Oxidation process of 45 steel slab at different temperatures was tested. On this basis, the oxidation kinetics model of slab surface was established, and the effect of oxide layer thickness on cooling process of slab was studied experimentally. The results show that during the oxidation activation period, the higher the slab temperature is, the faster the oxidation is, but the thickness of the surface oxide layer formed at different temperatures is similar. The oxidation dynamic coefficient of the slab is exp(9.77), and the apparent activation energy of the oxide layer is 9 323.07 kJ/mol. Quantitative relationship between slab temperature and oxide thickness and cooling time shows that the thicker the oxide layer, the slower the slab cooling. The average cooling rate decreases by 1.051 ℃/min with the increase of oxide thickness by 0.1 mm.
作者
张思远
龙木军
艾松元
谭锴
陈登福
黄云伟
ZHANG Si-yuan;LONG Mu-jun;AI Song-yuan;TAN Kai;CHEN Deng-fu;HUANG Yun-wei(College of Materials Science and Engineering,Chongqing University,Chongqing 400030,China;Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials,Chongqing University,Chongqing 400030,China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2020年第2期129-134,共6页
Journal of Iron and Steel Research
基金
国家自然科学基金资助项目(51874059,51874060)。
关键词
连铸
氧化动力学
氧化层
降温速率
continuous casting
oxidation kinetics
oxide layer
cooling rate
