连铸TP347H钢坯中Nb的偏析现象分析

doi:10.13228/j.boyuan.issn1006-9356.20220247

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Abstract Segregation of Nb is found in the TP347H billet produced by continuous casting process, inner wall cracking in cross rolling perforation is generated in the pipe after hot continuous rolling when the Nb segregation is serious, leading to the reduction of yield and low comprehensive performance of steel tube. In view of segregation phenomenon, the precipitation behavior of niobium containing precipitates was studied by means of thermodynamic calculation and experiment, the main factors affecting Nb segregation in continuous casting billet and the characteristics of primary MX phase (niobium carbonitride) precipitations were analyzed. The results show that composition optimization of TP347H steel produced by continuous casting process should focus on the content of C and Nb elements. And the segregation phenomenon of continuous casting TP347H billet exists in the central area of the billet, which leads to the difference in morphology and size of the primary MX phase precipitations between edge and central area of billet.

Key words： TP347H continuous casting Nb segregation thermodynamic calculation primary MX phase

Received: 15 March 2022

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	Articles by authors
	CHEN Qi-wei
	BAO Han-sheng
	YANG Gang
	WU Ming-hua
	CAI Long
	YANG Li-xia

Cite this article:

CHEN Qi-wei,BAO Han-sheng,YANG Gang等. Analysis of Nb segregation in continuous casting TP347H billet[J]. China Metallurgy, 2022, 32(6): 61-70.

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20220247 OR http://www.zgyj.ac.cn/EN/Y2022/V32/I6/61

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