国内外油井管钢中非金属夹杂物的对比分析

doi:10.13228/j.boyuan.issn0449-749x.20200349

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Abstract In order to improve the performance of OCTG (oil country tubular goods) steel, the composition and morphology of inclusion were observed by scanning electron microscope. The particle size distribution, inter-surface distance, and distribution of inclusions were analyzed. The evolution of inclusions during the cooling process was analyzed based on the equilibrium solidification model with FactSage software. The collision rate of inclusions in OCTG steel was estimated based on the inclusion collision number balance model. The results indicate that there were mainly CaS with encapsulated Spinel inclusions in Japanese OCTG steel, and CaO with encapsulated Spinel and pure Spinel inclusions in Chinese OCTG steel, respectively. In comparison with the inclusions in Chinese OCTG steel, the inclusions in Japanese OCTG steel are less and smaller and distribute more uniformly. The number density of inclusions is 7.5/mm² in Japanese OCTG steel and 28.3/mm² in Chinese OCTG steel. The largest inclusions are less than 5 μm in Japanese OCTG steel, which reaches 20 μm in Chinese OCTG steel. The calculated results about inclusion evolution during the cooling process based on FactSage are in good agreement with experimental results. The collision rate of inclusions in Chinese OCTG steel is two orders of magnitude higher than that in Japanese OCTG steel.

Key words： non-metallic inclusions OTCG amount collision evolution spinel

Received: 08 July 2020

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	Articles by authors
	ZHANG Yin
	WANG Lin-zhu
	LI Jun-qi
	YANG Shu-feng
	CHEN Chao-yi

Cite this article:

ZHANG Yin,WANG Lin-zhu,LI Jun-qi等. Comparison on non-metallic inclusions in OCTG steel from home and abroad[J]. Iron and Steel, 2021, 56(2): 69-75.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20200349 OR http://www.chinamet.cn/Jweb_gt/EN/Y2021/V56/I2/69

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