PRODUCTION OF HIGH ALUMINA CONTENT FERRITIC STAINLESS STEEL

摘要

PURPOSE:To produce the high Al content stainless steel with a simple stage by heating the laminate alternately superposed with ferritic stainless steel sheets and Al sheets in a vacuum. CONSTITUTION:One or more sheets of the sheets or thin coils 1 of the ferritic stainless steel and one or more sheets of the sheets or thin coils 2 of the Al sheets having 5 to 110% total sheet thickness of the above-mentioned steel are alternately superposed on each other. While the sheet or thin coil 3 or 2 to 5% Al-Cr-Fe steel formed with an oxide film previously is superposed on this laminate, the laminate is coiled as the cores of the pipe 4. This laminate is heated and annealed to 900 to 1,200 deg.C in a vacuum and is then cooled and un-coiled. The aluminum foil 2 between the coils 1 is absorbed to the stainless steel and is made into one sheet. Rolling and bright annealing are repeated at need to make uniform the concn. of the Al. The Al-Cr-Fe steel sheet superposed as a release material is easily peeled at the time of un-coiling.