稀土对高强耐蚀钢中夹杂物的影响

doi:10.13228/j.boyuan.issn0449-749x.20220697

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Abstract Corrosion failure is becoming a serious issue for OCTG (oil country tubular goods) due to the deteriorative exploitation conditions and the increasing demand for deep oil fields operation with H₂S medium. Non-metallic inclusions in steel are one of the key factors to worsen both the hydrogen resistance and sulfide stress corrosion resistance of OCTG. It is noted that rare earth elements have the potential to control the properties of non-metallic inclusions in steels. Based on the industrial production experiments, the effect of Ce-La alloy on inclusions in 110 grade oil casing steel produced by an Al-killed and Ca treatment process was studied by employing systematic sampling, SEM-EDS detection and thermodynamic calculation. The comparison was carried out between the cases with and without rare earth addition. The results showed that the inclusions in steel without rare earth addition were mainly of Ca-Al(-Mg)-O, Ca-Al(-Mg)-O+CaS, CaS and TiN. The inclusions after adding Ce-La alloy (the mass percent of La and Ce was 0.013 9% and 0.027 8%, respectively), however, became mainly of Ce-La-O(-S), Ce-La-O(-S)+CaS, Ce-La-P-As, and TiN. The Ce-La-O(-S) and Ce-La-O(-S)+CaS inclusions were possibly produced directly under the current condition of molten steel or indirectly modified by rare earth on the Ca-Al-O inclusions. The Ce-La-P-As and TiN inclusions were mainly generated in the solidification process of molten steel. The thermodynamic calculation showed that the evolution process of inclusions in steel after adding rare earth was as follows: Inc_liq(Ca-Al-O)→CaS+Inc_liq→CaS+CaO+Inc_liq→CaS+CaO+ReAlO₃+Inc_liq→CaS+CaO+ReAlO₃→CaS+CaO+ReAlO₃+Re₂O₃→CaS+CaO+Re₂O₃→CaS+Re₂O₃. The test results of anti-sulfide stress corrosion by Method A showed that the sulfide resistance of 110 grade casing steel could be significantly improved by adding Ce-La alloy, and the relevant mechanism was analyzed as well.

Key words： high-strength steel inclusions modification rare earth corrosion resistance

Received: 10 November 2022

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	Articles by authors
	LIU Jin-wen
	TANG Hai-yan
	LI Gen
	WANG Kai-min
	JIANG Xue-yuan
	ZHANG Jia-quan

Cite this article:

LIU Jin-wen,TANG Hai-yan,LI Gen等. Effect of rare earth on inclusions in a high-strength corrosion resistant steel[J]. Iron and Steel, 2023, 58(5): 70-82.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220697 OR http://www.chinamet.cn/Jweb_gt/EN/Y2023/V58/I5/70

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