Development of High Interstitial Stainless Steel and Evaluation of Its NaCl Corrosion Resistance

  • Cheolmin Ahn
  • Hyunju Lee
  • Yoonseok Lee
  • Seungchan Cho
  • Brajendra Mishra
  • Eunkyung LeeEmail author


High interstitial Fe–Cr–Mn–C–N stainless steels, CN66 (0.38 wt% N + 0.28 wt% C) and CN71 (0.44 wt% N + 0.27 wt% C), were cast under atmospheric pressure to develop a new drill collar for use in petroleum industry. To evaluate the corrosion property, CN66 and CN71 were compared with high-Mn stainless steel, P550, which is currently being used as a drill collar material. Through the measurement of the corrosion resistance based on the chemical compositions, CN71 exhibited the highest corrosion property, a mean of 35.74, corresponding to strong corrosion resistance. However, CN71 exhibited a mean of 0.517 mpy for the corrosion rate compared to 0.37 mpy for P550, after the immersion experiment in 3.5 wt% NaCl. With high C content, the formation of carbide along the grain boundaries in CN71 and CN66 caused intergranular corrosion. However, this could be restricted by heat treatment at 1050 °C and 1180 °C with uniform distributions of chemical compositions via air cooling, decreasing the corrosion rates significantly.

Graphic Abstract


High interstitial stainless steel Corrosion resistance Microstructure Heat treatment 



This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (NRF-2014M3C1A9060717 and NRF-2019R1I1A3A01062863), and the Basic Research Project (GP2017-025) of the Korea Institute of Geoscience and Mineral Resources (KIGAM) funded by the Ministry of Science, ICT and Future Planning of Korea, and the Korea Maritime and Ocean University Research Fund.


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Copyright information

© The Korean Institute of Metals and Materials 2019

Authors and Affiliations

  1. 1.Department of Ocean Advanced Materials Convergence EngineeringKorea Maritime and Ocean UniversityBusanRepublic of Korea
  2. 2.Mineral Resources Research DivisionKorea Institute of Geoscience and Mineral ResourcesDaejeonRepublic of Korea
  3. 3.Graduate School of Natural Science and TechnologyOkayama UniversityOkayamaJapan
  4. 4.Functional Composites DepartmentKorea Institute of Materials Science (KIMS)ChangwonRepublic of Korea
  5. 5.Metal Processing Institute, Worcester Polytechnic InstituteWorcesterUSA

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