薄带连铸表面质量控制的研究现状与展望

doi:10.13228/j.boyuan.issn1005-4006.20230001

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摘要薄带连铸采用一对铜结晶辊完成钢水的亚快速凝固,直接铸轧出尺寸及性能满足最终产品要求的近终成型工艺。薄带连铸冷速达1 000 ℃/s,产品厚度 1~2 mm,省去再加热和反复热轧工序,在生产薄规格钢种具有明显优势。然而,经铜辊浇铸出的铸带很薄,其表面质量(如凹陷、微裂纹等)难以控制,后期也难以修复,如何减少铸带表面质量缺陷成为薄带连铸技术发展的瓶颈之一。主要综述了薄带连铸生产低碳钢、不锈钢和TWIP钢铸带表面缺陷的产生机理,铸带表面缺陷主要起源于钢液在结晶辊初始凝固过程,受钢种成分、铸辊分离力、夹杂物、自然沉积膜、结晶辊、保护气氛等多种因素影响,不同钢种需要采用合适的薄带连铸工艺参数。

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	杨任一
	曾杰
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	王万林

关键词 ：薄带连铸, 低碳钢, 不锈钢, TWIP钢, 表面质量

Abstract：Steel strip casting process adopts a pair of copper roll to complete the sub-rapid solidification of molten steel, and direct casting and rolling to produce a near final product that meets the requirements of the size and properties. The cooling rate of strip casting is about 1 000 ℃/s and the thickness of the product is 1-2 mm. It has obvious advantages in the production of thin specification steel by eliminating the reheating and repeated hot rolling procedures. However, the thickness of the strip is very thin, and thus its surface quality (such as dents, micro cracks, etc.) is difficult to control and repair later. How to reduce the surface defects of strip has become one of the bottlenecks in the development of this new technology. The formation mechanism and control measures of surface defects during strip casting of low carbon steel, stainless steel, and TWIP steel are mainly reviewed. The surface defects of cast strip mainly originate from the initial solidification process of liquid steel in the casting roll, and are affected by various factors such as steel composition, roll separation force, inclusions, casting roll, protective atmosphere, etc. Therefore, appropriate strip continuous casting process parameters should be adopted for different steel types.

Key words： strip casting low carbon steel stainless steel TWIP steel surface quality

收稿日期: 2023-01-04

引用本文:

杨任一, 曾杰, 路程, 朱晨阳, 王万林. 薄带连铸表面质量控制的研究现状与展望[J]. 连铸, 2023, 42(3): 16-21. YANG Ren-yi, ZENG Jie, LU Cheng, ZHU Chen-yang, WANG Wan-lin. Research status of surface quality control during strip casting of steel. CONTINUOUS CASTING, 2023, 42(3): 16-21.

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