Kobe Steel, Ltd.

Kabushiki Kaisha Kobe Seiko Sho

Nobuyasu Kawai

Hirofumi Fujimoto

Minoru Hirano

Hiroshi Takigawa

Katuhiko Honma

Tsuneo Tatsuno

Hajime Esaka

Masaru Ishii

Kunihiko Tsuji

Kohichi Beppu

Minoru Hirono

Hiromune Manto

Toru Yukawa

A high-speed steel obtained by powder metallurgy processing wherein a chemical composition includes, by weight %, C: a quantity (%) which satisfies with the following formula ##EQU1## where Ceq=0.19+0.017 (W+2Mo)+0.22 V

High hardness and high toughness nitriding powder metallurgical

A method for cladding a corrosion resistant high alloy material on surfaces of crossed cavities in a vessel of a high strength metallic material forming a valve casing or the like, the method including the steps of prefabricating first and second cladding structures of generally tubular shapes conforming with the crossed cavities from a thin sheet of a high alloy material; providing grooves on the surfaces of the crossed cavities for receiving corner members of a high alloy material to be located at joined corners of the first and second cladding structures at the intersection of the crossed cavities and end members of a high alloy material to be fitted on end portions of the cladding structures; assembling the first and second cladding structures, corner members and end rings into the crossed cavities; sealing the contacting surfaces of the assembled parts by welding the end members to the vessel and cladding structures; coalescing the assembled parts and the vessel by applying a high pressure to the cladding structures at a high temperature; and removing overlapped portions of the coalesced cladding structures at the intersection of the crossed cavities to communicate the latter with each other.

Method for cladding interior surfaces with externally prefabricated

A high-speed steel obtained by powder metallurgy processing having a chemical composition which includes, in weight %,

A nitrogen containing powder metallurgical tool steel comprising at least 0.40% N, 1.6 - 15% V, C in an amount satisfying the relationship of

Nitrogen containing powder metallurgical tool steel

A nitrogen containing high speed steel produced by powder metallurgical process, which comprises at least 0.40% N, 3.0-15% V, C in an amount satisfying the relationship of 1.0 + 0.2V (%) .ltoreq. (C + N) .ltoreq. 1.5 + 0.2V (%), at least one element selected from the group consisting of up to 15% Cr, up to 10% Mo, up to 20% W, and up to 15% Co, with balance iron.

Nitrogen containing high speed steel obtained by powder metallurgical

The present invention relates to a nitrogen containing high speed steel obtained by the powder metallurgical process, which comprises at least 0.40% N, 1.6 to 15% V, C in an amount satisfying the relationship of 0.5 + 0.2V (%) .ltoreq. (C + N) .ltoreq. 0.8 + 0.2V (%), at least one element selected from the group consisting of up to 15% of Cr, up to 10% of Mo, up to 20% of W and up to 15% of Co with the balance iron.

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Kobe, Japan

Nobuyasu Kawai