| 摘要 |
The invention relates to metallurgy, more specifically to chromium- and nickel alloyed steels which are used in reactors (retorts) for magnesium-thermic production of spongy titanium. The inventive hot- and corrosion-resistant steel comprises iron (Fe) in the form of a base, carbon (C), nitrogen (N), manganese (Mn), silicium (Si), chromium (Cr), nickel (Ni), vanadium (V), at least one type of rare-earth metal (P3M) from a group of cerium (Ce), lanthanum (La), praseodymium (Pr), neodymium (Nd), said steel also contains titanium (Ti) and at least one element from a group of niobium (Nb), tantalum (Ta), zirconium (Zr) and hafnium (Hf) which are used in the form of carbide- and nitride solvents at the following component ratio, in mass %: C 0.04-0.15; N 0.01-0.25; Si 0.1-1.0; Mn 3.0-12.5; Cr 1.0-15.0; Ni 1.0-7.0; V 0.05-0.5; one or several elements of a group of Ce, La, Pr, Nd 0.0001-0.01; and Ti 0.1-2.0; and one or several elements of a group of Nb, Ta, Zr, Hf 0.05-0.2. Said invention makes it possible to increase the hot and corrosion-resistance in aggressive media used for the magnesium-theremic production of spongy titanium and to reduce the contamination thereof with detrimental impurities.
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