改质工艺对高强度低合金钢夹杂物特性的影响

doi:10.13228/j.boyuan.issn1006-9356.20200379

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Abstract The influence of different inclusion modification processes (including unmodified, RE treatment and Ca treatment) on the inclusion characteristics of aluminum-killed high-strength low alloy steel was studied by the industrial 300 t ladle furnace. The results show that the inclusions were mainly irregular Al-Mg-Ca-O-S-Mn composed inclusion with high aluminium content. The inclusion density was the lowest (only 7.4 and 9.5/mm²), but the average size of the inclusions was more than 3 μm, and the number of large size inclusions not less than 20 μm was up to 0.1/mm². The inclusions in steel plate sample by Re treated furnace are mainly spherical La-Ce-O-S with a small amount of Ca or Al. Although the maximum inclusion density is 32.5/mm², the average inclusion size is the smallest (only 2.3 μm). No inclusions less than 20 μm were detected in one sample, and almost no large inclusion(≥20 μm) was detected in the other sample (only 0.01/mm²). The inclusions in the steel plate of the Ca treated furnace were almost spherical inclusions. The inclusions were mainly Ca-Al-S-O. Besides, partial inclusions may contain small amounts of Mg or Mn. And the number of inclusions is also large, about 30/mm². The average size of inclusions is 2.7 μm, slightly larger than that of the rare earth treatment furnace, and basically there was no inclusion with size not less than 20 μm (0.01/mm²). The high temperature confocal microscopy tests show that the inclusion treated with rare earth and calcium is not easy to aggregate into large size inclusions at high temperature, while the alumina in the unmodified furnace is easy to aggregate into large size inclusions due to the high interface tension with liquid steel.The inclusions in the steel plate of the Ca treatment furnace were basically spherical inclusions. The inclusions were composed of CaS and calcium aluminate. And the number of inclusions was also large, about 30/mm². The average size of inclusions was 2.7 μm, slightly larger than that of the RE treatment furnace, and basically there was no inclusion with size not less than 20 μm(0.01/mm²). The confocal laser scanning microscopy results showed that the inclusions treated with rare earth and calcium were not easy to aggregate into large sized inclusions at high temperature. Al₂O₃ in the unmodified furnace was easy to aggregate into large sized inclusions due to the high interface tension with liquid steel.

Key words： high strength low alloy steel rare earth calcium treatment non-metallic inclusion fatigue life

Received: 22 June 2020

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	Articles by authors
	ZHANG Hong-yan
	TIAN Zhi-hong
	SHAO Xiao-jing
	LUAN Yi-kun
	DENG Xiao-xuan
	JI Chen-xi

Cite this article:

ZHANG Hong-yan,TIAN Zhi-hong,SHAO Xiao-jing等. Influence of modification processes on inclusion properties of high strength low alloy steel[J]. China Metallurgy, 2021, 31(2): 31-37.

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20200379 OR http://www.zgyj.ac.cn/EN/Y2021/V31/I2/31

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