EAF-LF-VD-CC工艺26CrMo7S钢夹杂物的演变规律

doi:10.13228/j.boyuan.issn1005-4006.20220131

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Abstract In order to control the inclusions in 26CrMo7S steel and improve the mechanical properties of the steel, the cleanliness analysis of the whole process was used to explore the evolution of inclusions in the EAF→LF→VD→CC process of a mills. The results show that the LF pitted inclusions are mainly composed of Al₂O₃, MgO and CaS combined with uneven composition and irregular morphology.After LF and VD refining, Al₂O₃, MgO, CaO, and CaS form non-uniform polygonal or nearly spherical composite inclusions, and the continuous increase of the CaO content. After calcium treatment, the inclusions were further spheroidized, and the main components were uniform composite inclusions of oxides wrapped with CaS. In the EAF-LF-VD-CC process, the number density of inclusions first decreased and then increased, and the number density decreased to a minimum of 16.1 mm^-2 in the VD process,and the average size showed a trend of first increase and then decrease, and the size in the VD process A maximum value of 2.83 μm is reached. The LF refining time is short, the calcium treatment is unreasonable, and the secondary oxidation of continuous casting is the main reason for the excessive inclusions in the molten steel. Increasing LF processing time appropriately, ensuring sufficient weak stirring, finding out appropriate calcium treatment “window”, ensuring the inclusion denature and not excessive introduction of CaO inclusion, using argon sealing, tundish argon blowing protection means in continuous casting process can effectively improve the cleanliness of liquid steel.

Key words： 26Cr7MoS steel non-metallic inclusions refining evolutionary law calcium treatment cleanliness

Received: 29 July 2022

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	Articles by authors
	JIAO Ao-teng
	YANG Shu-feng
	LI Jing-she
	SONG Jing-ling
	LI Heng-hua
	ZHANG Fu-jun

Cite this article:

JIAO Ao-teng,YANG Shu-feng,LI Jing-she等. Evolution of inclusions in 26CrMo7S steel produced by EAF-LF-VD-CC process[J]. CONTINUOUS CASTING, 2023, 42(2): 28-33.

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http://www.chinamet.cn/Jweb_lz/EN/10.13228/j.boyuan.issn1005-4006.20220131 OR http://www.chinamet.cn/Jweb_lz/EN/Y2023/V42/I2/28

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