Dispersion strengthened ferritic steel for high temperature stru

Details Dispersion strengthened ferritic steel for high temperature stru Dispersion strengthened ferritic steel for high temperature stru

1989-04-11

1990-10-16

Yee, Deborah

Metal treatment

Stock

Ferrous

148326, C22C 3822

Patent

active

049632000

ABSTRACT:
A dispersion strenghened ferritic steel having excellent ductility and toughness which has been heat treated to produce a matrix having a tempered martensitic structure composed of 0.05 to 0.25% by weight of carbon, 0.1% by weight or less of silicon , 0.1% by weight or less of manganese, 8 to 12% by weight of chromium, 0.1 to 4.0% by weight in total of molybdenum and tungsten, and 0.02% by weight or less of oxygen (exclusive of oxide particles) with the balance being iron and inevitable impurities and, homogeneously dispersed in the matrix, composite oxide particles comprising Y.sub.2 O.sub.3 and TiO.sub.2 in an amount of 0.1 to 1.0% by weight in total of Y.sub.2 O.sub.3 and TiO.sub.2 and a TiO.sub.2 to Y.sub.2 O.sub.3 molar ratio of 0.5 to 2.0.

REFERENCES:
patent: 3660173 (1972-05-01), Matsuno et al.
Huet, J. et al, "Dispersion-Strengthened Ferritic Steels as Fast-Reactor Structural Materials" Nuclear Technology vol. 24, Nov. 1974, 420/68.

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