Effect of rare earth on inclusions in a high-strength corrosion resistant steel
LIU Jin-wen1, TANG Hai-yan1, LI Gen2, WANG Kai-min1, JIANG Xue-yuan1, ZHANG Jia-quan1
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Institute of Special Steels, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China
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: Incliq(Ca-Al-O)→CaS+Incliq→CaS+CaO+Incliq→CaS+CaO+ReAlO3+Incliq→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.
刘锦文, 唐海燕, 李根, 王凯民, 姜雪媛, 张家泉. 稀土对高强耐蚀钢中夹杂物的影响[J]. 钢铁, 2023, 58(5): 70-82.
LIU Jin-wen, TANG Hai-yan, LI Gen, WANG Kai-min, JIANG Xue-yuan, ZHANG Jia-quan. 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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2023, Vol. 58 
