Effect of niobium on the structure of chromium ferritic steel
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In steel 01Kh25 alloyed with 0.23, 0.46 and 0.83% Nb there is formation of excess μ-phase [Nb48(Fe0.75Cr0.25)52] which embrittles bent specimens in tests for ICC. Grain boundaries remain clean and are not subject to corrosion failure. Resistance to overall corrosion is improved by a factor of 1.5 with introduction of not less than 0.46% Nb.
Presence of fine μ-phase particles in steel 01Kh25 alloyed with niobium does not worsen its deformability during hot rolling.
In order to provide high corrosion resistance and to obtain the optimum structure for steel 01Kh25 given vacuum heat treatment it is desirable to alloy it with up to 0.4% niobium.
KeywordsChromium Heat Treatment Corrosion Resistance Niobium Optimum Structure
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