Effect of niobium on the structure of chromium ferritic steel
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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- 1.A. Toshiro and M. Takaniko, "Effect of stabilizing elements on the local corrosion of high purity ferritic stainless steels," Nisein Séiko Tikho, No. 38, 61–73 (1978).Google Scholar
- 2.E. Houdremont, Special Steels, Vols. 1 and 2 [Russian translation], Metallurgiya, Moscow (1966).Google Scholar
- 3.O. A. Bannykh, P. B. Budberg, S. P. Alisova, et al., Phase Equilibrium Diagrams for Binary and Multicomponent Systems Based on Iron: Ref. Ed. [in Russian], Metallurgiya, Moscow (1986).Google Scholar
- 4.A. V. Rabinovich, É. D. Glebova, I. E. Sulaev, et al., "Study of the structure and properties of steel Kh25 with a different content of carbon and nitrogen," Izv. Vyssh. Uchebn. Zaved., Chern. Met., No. 8, 100–102 (1979).Google Scholar
- 5.A. A. Ivan'ko, Hardness (Handbook) [in Russian], Naukova Dumka, Kiev (1968).Google Scholar
- 6.N. D. Tomashov, S. A. Golovanenko, E. A. Ul'yanin, et al., "Corrosion and mechanical properties of high-chromium ferritic steels of high purity alloyed with molybdenum and palladium," Zasch. Met., No. 2, 106–111 (1980).Google Scholar