AUSTENITIC STAINLESS STEEL MATERIAL FOR DIFFUSION BONDING AND METHOD FOR MANUFACTURING DIFFUSION-BONDED ARTICLE

摘要

PROBLEM TO BE SOLVED: To obtain an austenitic stainless steel diffusion-bonded article exhibiting excellent bondability in a diffusion joint by "direct method" based on a work load equivalent to that of the conventional insertion method for insert materials.;SOLUTION: An austenitic stainless steel material for direct diffusion bonding includes a composition in which a Cr content is 9.0-37.0 mass%, an Ni content is over 3.0 to 40.0 mass%, an Si content is 0-0.50 mass%, and the total content of Ti and Al is 0-0.15 mass% and which forms an austenite single-phase structure in a temperature range of 1,200°C or lower, wherein a surface roughness Ra of a surface subjected to diffusion bonding is 0.30 μm or less, and wherein, in an analysis of the surface in a depth direction based on GDS, an oxide film thickness defined by a depth from an outermost surface to a point where an O (oxygen) concentration is reduced to one half of its peak value is 10 nm or less.;COPYRIGHT: (C)2014,JPO&INPIT