Kobe Steel, Ltd.

Kabushiki Kaisha Kobe Seiko Sho

Hirofumi Fujimoto

Nobuyasu Kawai

Minoru Hirano

Katuhiko Honma

Hiroshi Takigawa

Masaru Ishii

Hajime Esaka

Tsuneo Tatsuno

Hiromune Manto

Minoru Hirono

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 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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Ono, Japan

Hirofumi Fujimoto