PRE-ALLOYED STEEL POWDER FOR HIGHLY FATIGUE-RESISTANT SINTERED BODY AND CARBURIZED AND QUENCHED MATERIAL

WIPO Patent Application WO/2014/103999

A1

Provided is a pre-alloyed steel powder for a sintered body with high fatigue strength. The pre-alloyed steel powder contains at least one from the group consisting of 0.8-1.5% by mass of Mo, 0.5-1.4% by mass of Ni, and 0.5-1.1% by mass of Cr as alloy content and the Mo content [Mo], the Ni content [Ni], and the Cr content [Cr] satisfy the Mo/Ni/Cr balance relationship represented by expression (1). As a result of the foregoing, the steel powder can be used to obtain a sintered body with component rolling properties good enough to allow plastic deformation with low stress and can be used to obtain a carburized and quenched material that exhibits good fatigue strength after a heat treatment such as carburizing, quenching, and the like. Also provided is a carburized and quenched material that exhibits good fatigue strength even after carburizing, quenching, and tempering using such a pre-alloyed steel powder. 8.10 [Ni] + 3.71 [Mo] + 10.25 [Cr] ≤ 14.45 ... (1)

JPH059698	PRODUCTION OF HIGH-STRENGTH GALVANNEALED STEEL SHEET HAVING EXCELLENT FORMABILITY AND PAINTING BAKING HARDENABILITY
JP3801456	IRON AND RARE EARTH BASED PERMANENT MAGNET ALLOY AND PRODUCTION METHOD THEREFOR

YOSHIDA MASAKI
ARIMA SHINYA

PCT/JP2013/084453

July 03, 2014

December 24, 2013

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KOBE STEEL LTD (JP)

C22C38/00; B21H5/00; B22F1/00; B22F3/10; B22F3/24; C21D1/06; C21D9/32; C22C38/44; C23C8/22; C23C8/66; F16H55/06

JP2003013111A	2003-01-15
JPH01123002A	1989-05-16
JPH0225502A	1990-01-29
JPH05287452A	1993-11-02
JPH0959740A	1997-03-04
JPS6473005A	1989-03-17
JPH04337001A	1992-11-25

UEKI, Kyuichi et al. (JP)
Hisakazu Ueki (JP)

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