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Patent Searching and Data


Title:
METHOD FOR PRODUCING ALLOYED STEEL POWDER FOR SINTERED MEMBER STARTING MATERIAL
Document Type and Number:
WIPO Patent Application WO/2017/043091
Kind Code:
A1
Abstract:
Provided is a method for efficiently and stably producing, via a water atomization process, an alloyed steel powder containing easily-oxidizable Cr as an alloying element. This method for producing an alloyed steel powder for a sintered member starting material includes a water atomization step for obtaining a water-atomized iron-based powder by water-atomizing a molten steel, and a heat treatment step for obtaining an alloyed steel powder by heat-treating the water-atomized iron-based powder for reduction. The alloyed steel powder has a component composition that contains, as alloying elements, at most 0.3-3.5 mass% Cr and 0.08 mass% Mn, with the remainder comprising Fe and unavoidable impurities. The C content [C] (mass%) in the molten steel and the Cr content [Cr] (mass%) in the molten steel satisfy the relation of formula (1): 0.10≤[C]/[Cr]2/3≤0.35.

Inventors:
NAKAMURA NAOMICHI (JP)
KOBAYASHI AKIO (JP)
UNAMI SHIGERU (JP)
Application Number:
PCT/JP2016/004121
Publication Date:
March 16, 2017
Filing Date:
September 09, 2016
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
International Classes:
B22F9/08; B22F1/00; B22F1/142; C22C38/18; C22C38/28; C22C38/00
Foreign References:
JPH05287452A1993-11-02
JP2013533379A2013-08-22
JPH06306403A1994-11-01
JPS5364606A1978-06-09
JP2002322503A2002-11-08
Attorney, Agent or Firm:
SUGIMURA, Kenji (JP)
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