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http://dx.doi.org/10.14773/cst.2018.17.6.279

Effect of Manufacturing Process on the Corrosion Properties of 304L Stainless Steel Pipe with 8-inch Diameter  

Kim, K.T. (Research Center for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University)
Hur, S.Y. (Research Center for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University)
Chang, H.Y. (Power Engineering Research Institute, KEPCO Engineering & Construction Company)
Kim, Y.S. (Research Center for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University)
Publication Information
Corrosion Science and Technology / v.17, no.6, 2018 , pp. 279-286 More about this Journal
Abstract
Austenitic stainless steels used in nuclear power plants mainly use pipes made of seamless pipes, which depend on imports. The manufacturing process and high cost are some of the problems associated with seamless pipes. Therefore, in this study, the corrosion characteristics of the seamless pipe and the SAW pipe were assessed to determine the safety and reliability of the SAW pipe in a bid to replace the seamless pipe. Microstructure was analyzed using an optical microscope and the degree of hardness was measured using a Rockwell B scale. Intergranular corrosion resistance was evaluated by ASTM A262 Practice A, C, and E methods. The degree of sensitization was determined using a DL-EPR test. Anodic polarization test was performed in deaerated 1% NaCl solution at $30^{\circ}C$ and the U-bend method was used to evaluate the SCC resistance in 0.01 M $Na_2S_4O_6$ at $340^{\circ}C$ and 40% NaOH solution at $290^{\circ}C$. Weld metal of the SAW pipe specimen showed relatively high degree of sensitization and intergranular corrosion rate. However, annealing to SAW pipes improved the corrosion properties in comparison to that of the seamless pipe.
Keywords
304L stainless steel; Seamless pipe; Welded pipe; Annealing; Nuclear power plant;
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