PRODUCTION METHOD FOR ALLOY STEEL POWDER FOR POWDER METALLURGY

WIPO Patent Application WO/2017/056509

A1

Provided is a method for producing an alloy steel powder for powder metallurgy. The method uses a moving bed furnace and, without the need for gas analysis, which makes cumbersome maintenance necessary, makes it possible to heat treat an iron-based powder that contains Cr and Mn and stably reduce C content and O content. A production method for an alloy steel powder for powder metallurgy wherein an atomized iron-based powder that has a specific component composition is prepared, wherein the atomized iron-based powder is supplied to the inside of a moving bed furnace such that a filling layer that has a thickness of d (mm) is formed, wherein a hydrogen-containing gas is supplied to the inside of the moving bed furnace such that the hydrogen-containing gas has an average gas flow velocity of v (mm/s), and wherein the atomized iron-based powder is reduced by being heat treated inside the moving bed furnace and an alloy steel powder for powder metallurgy is produced, wherein d and v satisfy the expression d/√v ≤ 2.9 (mm1/2∙s1/2).

JPS634001	PRODUCTION OF PERMANENT MAGNET OF SINTERED BODY
JP4377685	Fine grain sintered cemented carbide, its manufacturing and usage method

KOBAYASHI AKIO (JP)
NAKAMURA NAOMICHI (JP)
SATO ITSUYA (JP)

PCT/JP2016/004438

April 06, 2017

September 30, 2016

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JFE STEEL CORP (JP)

B22F1/00; B22F1/142; C22C38/00; C22C38/22

JPH09170002A	1997-06-30
JP2006016688A	2006-01-19

SUGIMURA, Kenji (JP)

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