高耐食性焼結ステンレス鋼に関する研究

概要

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In order to improve the corrosion resistance of sintered austenitic stainless steels, the influences of partial pressure of nitrogen on sintered SUS 316L and the optimization of Ni, Cr and Mo contents were evaluated by 5% NaCl solution spray test. The results are summerized as follows.(1) The corrosion resistance of SUS 316L sintered in vacuum was inferior to that of SUS 316L sintered in 670Pa-N2, because Cr depleted layer was formed by sublimation from the surface, during sintering in vacuum.(2) The corrosion resistance of sintered austenitic stainless steels was improved by Cr and Mo additions, especially Mo content being more effective. Sintered steel containing 19%Cr, 16%Ni and 4%Mo was free of rusting even after salt spray test for 345.6ks.(3) The corrosion resistance of 19Cr-16Ni-4Mo steel sintered in 670Pa-N2 was as good as that of wrought SUS 304L in the atomospheric exposure test, the salt spray test and the cycle corrosion test containing the corrosive NaCl solution in the open pore.
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