HIGHLY CORROSION-RESISTANT AUSTENITIC STAINLESS STEEL, NUCLEAR POWER GENERATION PLANT CONSTRUCTED BY USING THE STAINLESS STEEL, WELD JOINT AND STRUCTURAL MEMBER

摘要

PPROBLEM TO BE SOLVED: To maintain the soundness of a structure of a nuclear reactor by inhibiting stress corrosion cracking even when a scar due to surface working remains on the surface when a plant has been manufactured. PSOLUTION: The austenitic stainless steel includes, by mass%, 17 to 20% Cr, 10 to 13% Ni, 0.001 to 0.020% C, 0.1 to 1.0% Si, 0.1 to 2.0% Mn, 0.035% or less P, 0.015% or less S, 0.01 to 3.0% Mo, 0.001 to 0.08% N, 0.01 to 2.5% Cu and the balance Fe with impurities; and has an M value of 590 to 760, which is calculated according to the expression 1: M=462(C+N)+9.2Si+8.1Mn+13.7Cr+29(Ni+Cu)+18.5Mo, and an S value of 24 to 45, which is calculated according to the expression 2: S=32.7+101C-13Si-1.2Mn-0.9Cr+2Ni-5.3Mo+0.1Cu-179N, wherein symbols for elements in the expressions represent mass% of each component. PCOPYRIGHT: (C)2009,JPO&INPIT