非稳态浇注对帘线钢洁净度的影响

doi:10.13228/j.boyuan.issn1005-4006.20230002

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摘要为全面掌握某钢厂帘线钢在非稳态浇注工况下的洁净度水平,为生产制定合理的头尾坯长度以及进行产品分级管理提供依据,对非稳态浇注和稳态浇注工况下的连铸坯分别取样,对比分析其洁净度差异,并通过水力学试验模拟分析了中间包充包过程中的渣-钢界面行为,进而解释了造成铸坯洁净度差异的原因。研究结果表明,非稳态浇注工况下帘线钢铸坯的洁净度明显低于稳态工况,其中T.O质量分数是稳态浇注工况的1.76倍,N质量分数是稳态浇注工况的1.23倍;两种工况下的显微夹杂物分别为52.89 个/mm²和26.1 个/mm²,大型夹杂物分别是11.49 mg/10 kg钢、4.36 mg/10 kg钢。充包时钢液裸露、二次氧化和卷渣是造成非稳态浇注时铸坯洁净度差的主要原因。

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	牛帅
	邓伟
	王得炯
	胡志勇
	王凯民
	王宇航
	唐海燕

关键词 ：帘线钢, 非稳态浇注, 钢水洁净度, 水模拟, 夹杂物, 卷渣

Abstract：In order to have a sound grasp of the cleanliness level of tire cord steel billet produced in a steel plant under unsteady continuously casting condition, and provide the basis for determining reasonable head and tail billet length and the product classification management during industrial production, the cleanliness difference of the billet cast under unsteady and steady casting conditions was analyzed and the slag-steel interface behavior during tundish filling was studied by using water model method in the present study. The reason for the billet cleanliness difference under the two casting conditions was explained. The results show that: The cleanliness of the tire cord steel billet under the unsteady casting condition is obviously lower than that under the steady casting condition. The T.O and N is 1.76 and 1.23 times higher than that under the steady casting condition. The micro-inclusion and macro-inclusion amount of the unsteady and steady casting condition are 52.89 mm^-2 and 26.1 mm^-2, and 11.49 mg/10 kg steel and 4.36 mg/10 kg steel, respectively. Exposure of molten steel, secondary oxidation and slag entrapment during tundish filling process were found to be some reasons that lead to poor cleanliness of the billets under unsteady casting condition.

Key words： tire cord steel unsteady casting condition cleanliness of steel water model inclusions slag entrainment

收稿日期: 2023-01-05

引用本文:

牛帅, 邓伟, 王得炯, 胡志勇, 王凯民, 王宇航, 唐海燕. 非稳态浇注对帘线钢洁净度的影响[J]. 连铸, 2023, 42(1): 74-81. NIU Shuai, DENG Wei, WANG De-jiong, HU Zhi-yong, WANG Kai-min, WANG Yu-hang, TANG Hai-yan. Effect of unsteady casting condition on cleanliness of tire cord steel. CONTINUOUS CASTING, 2023, 42(1): 74-81.

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