8인치 직경의 304L 스테인리스강관의 부식특성에 미치는 제작공정의 영향
Effect of Manufacturing Process on the Corrosion Properties of 304L Stainless Steel Pipe with 8-inch Diameter
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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 associatedwith seamless pipes. Therefore, in this study, the corrosion characteristics of the seamless pipe andthe SAW pipe were assessed to determine the safety and reliability of the SAW pipe in a bid toreplace the seamless pipe. Microstructure was analyzed using an optical microscope and the degreeof hardness was measured using a Rockwell B scale. Intergranular corrosion resistance was evaluatedby ASTM A262 Practice A, C, and E methods. The degree of sensitization was determined usinga DL-EPR test. Anodic polarization test was performed in deaerated 1% NaCl solution at 30 oC andthe U-bend method was used to evaluate the SCC resistance in 0.01 M Na2S4O6 at 340 oC and 40%NaOH solution at 290 oC. Weld metal of the SAW pipe specimen showed relatively high degree ofsensitization and intergranular corrosion rate. However, annealing to SAW pipes improved the corrosionproperties in comparison to that of the seamless pipe.
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 associatedwith seamless pipes. Therefore, in this study, the corrosion characteristics of the seamless pipe andthe SAW pipe were assessed to determine the safety and reliability of the SAW pipe in a bid toreplace the seamless pipe. Microstructure was analyzed using an optical microscope and the degreeof hardness was measured using a Rockwell B scale. Intergranular corrosion resistance was evaluatedby ASTM A262 Practice A, C, and E methods. The degree of sensitization was determined usinga DL-EPR test. Anodic polarization test was performed in deaerated 1% NaCl solution at 30 oC andthe U-bend method was used to evaluate the SCC resistance in 0.01 M Na2S4O6 at 340 oC and 40%NaOH solution at 290 oC. Weld metal of the SAW pipe specimen showed relatively high degree ofsensitization and intergranular corrosion rate. However, annealing to SAW pipes improved the corrosionproperties in comparison to that of the seamless pipe.
참고문헌 (13)
- EPRI, "PWR Primary Water Chemistry Guidelines, Volume 1, Revision 4", ~ (1999)
- S. H. Hong, , Trends Met. & Meter. Engineering, 13, pp.8~ (2000)
- Development of high-quality SAW welded pipes to replace seamless pipe in nuclear power plant, "Dongyeon steel", MOTIE, ~ (2015)
- K. Weman, "Welding Processes Handbook", pp.3~ (2003), Woodhead Publishing
- A. J. Sedriks, "Corrosion of Stainless steels", pp.18~ (1996), John Willey & Sons, Inc
- K. T. Kim, , Materials, 10, pp.713~ (2017)
- 김영식, "Intergranular Corrosion Mechanism of Slightly-sensitized and UNSM-treated 316L Stainless Steel", CORROSION SCIENCE AND TECHNOLOGY, 15(5), pp.226~236 (2016), 한국부식방식학회[DOI]
- K. R. Trethewey, "Corrosion Science Engineering" (1995), Longman Scientific & Technical
- E. L. Hall, , Metall. Mater. Trans. A, 15, pp.793~ (1984)
- J. D. Gate, , Mater. Sci. Technol, 3, pp.450~ (1987)
- "ASTM A 262, Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels", ~ (2002)
- "ASTM G 108, Standard Test Method for Electrochemical Reactivation (EPR) for Detecting Sensitization of AISI type 304 and 304L Stainless Steels", ~ (2004)
- "ASTM G 30, Standard Practice for Making and Using U-Bend Stress-Corrosion Test Specimens", ~ (2003)