| 摘要 |
PROBLEM TO BE SOLVED: To provide a supper ODS (oxide dispersion strengthening) steel having high crrosion resistance to lead, bismuth and super critical pressure water and at the same time, the strength particularly the high temperature strength, is improved. SOLUTION: The oxide dispersion strengthening type alloy steel is produced by applying a mechanical alloying treatment to powers, with which into Fe powder, as the ratio to the total weight, 13.0-23.0% Cr powder, 3.5-5.0% Al powder and 0.25-0.45% Y<SB>2</SB>O<SB>3</SB>powder, 0.02-0.05% C powder and at least one side of 0.2-0.7% Hf powder and 0.4-1.0% Zr powder, are mixed. Among those powders, Hf or/and Zr are prevented from the agglomeration of the oxide with Al, and since the distribution of the oxide becomes fine and high density, such as 9Cr ODS steel, the high temperature strength is improved. Further, Hf or/and Zr are formed as the carbide or the oxide in the crystal grain boundary, and thus, the high temperature strength is improved by restraining the grain-boundary slipping. COPYRIGHT: (C)2010,JPO&INPIT |
