ULTRAHIGH TEMPERATURE HOT-FORGED NON-HEAT-TREATED PART, AND ITS PRODUCTION METHOD

Japanese Patent JP2004360070

A

To provide an ultrahigh temperature hot-forged non-heat-treated part with a complicated shape which has high strength and high toughness even if quenching and tempering are obviated by an ultrahigh temperature hot forging method capable of improving the yield of the material and capable of securing the service life of a die.

The ultrahigh temperature hot-forged non-heat-treated part has prescribed components and has a microstructure of ferrite and pearlite. In the surface layer part of a forging in the range from the surface to 1/20 of the thickness, the ferrite fraction Fs is 0.15 to 0.7, and the average ferrite grain diameter ds is 5 to 20 μm. In the central part of the forging in the range from the center of the thickness in the forging to 2/5, the ferrite fraction Fc is 0.1 to 0.6, and the average ferrite grain diameter dc is 10 to 30 μm. Also, Fs/Fc is 1.05 to 1.40, and ds/dc is 0.80 to 095.

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KADA OSAMU
TODA MASAHIRO
ONO NAOHITO
KINO KINSEI
SEGAWA KOHEI
IWAKI SHOJI
NOMURA KAZUE

JP2004142517A

December 24, 2004

May 12, 2004

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NIPPON STEEL CORP
TOYOTA MOTOR CORP
AICHI STEEL WORKS LTD

B21J1/02; B21J5/00; C21D8/00; C22C38/00; C22C38/38; (IPC1-7): C22C38/00; B21J1/02; B21J5/00; C21D8/00; C22C38/38

Takashi Ishida
Jun Tsuruta
Hiroshi Kamematsu
Masaya Nishiyama

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