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AssigneesDoryokuro Kakunenryo Kaihatsu Jigyodan, Kobe Steel, Ltd., Sumitomo Metal Industries, Ltd.
InventorsTakanari Okuda, Shigeo Nomura, Itaru Shibahara, Yuji Enokido, Masayuki Fujiwara, Toshio Nishida, Hiroshi Teranishi, Susumu Hirano, Aturou Iseda, Motoharu Nakajima
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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.
A dispersion strengthened ferritic steel having excellent ductility and toughness, which has been heat treated to produce a matrix having a tempered martensitic structure comprising 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 with the balance being iron and inevitable impurities and, homogeneously dispersed in said matrix, composite oxide particles comprising Y.sub.2 O.sub.3 and at least one of TiO.sub.2, Al.sub.2 O.sub.3, ZrO.sub.2 and MgO in an amount of 0.1 to 1.0% by weight in total inclusive of Y.sub.2 O.sub.3 and the molar ratio of the total of said at least one of TiO.sub.2, Al.sub.2 O.sub.3, ZrO.sub.2 and MgO is 0.5 to 2.0 relative to Y.sub.2 O.sub.3.
Dependencies are inferred from the claim text.