| 摘要 |
PROBLEM TO BE SOLVED: To provide a stress corrosion crack preventing method for pressure member capable of preventing the generation and the advance of a stress corrosion crack. SOLUTION: In this stress corrosion crack preventing method of a pressure member made out of a metallic material and placed under the wet environment of chloride, the design data relating to a component forming the pressure member is inputted, a limit value KISCC is determined by formula (1) on the basis of designing data, and each component is designed to keep a value less than the limit value KISCC. In the formula (1), A<SB>0</SB>: constant corresponding to design temperature, R<SB>ap</SB>: polarization resistance in dissolving metal on tip of crack, R<SB>c1</SB>: sum of resistance of solution by molten iron ion from tip of crack to outer surface of crack, and resistance to polarization of cathode of outer surface of crack, R<SB>c2</SB>: sum of resistance of solution relating to hydrogen ion generated by hydrolysis from tip of crack to inner surface of crack, and resistance to polarization of cathode of inner surface of crack, andω: value determined on the basis of equilibrium constant of hydrolysis reaction, free chloride ion concentration inside of crack, and the like. COPYRIGHT: (C)2004,JPO
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