Pre-alloyed steel powder and carburized quenched material for high fatigue strength sintered body

A carburizing and quenching and pre-alloying technology is applied to carburizing and quenching materials and carburizing and quenching materials. It can solve the problem of material inconsistency and achieve the effect of good fatigue strength

Active Publication Date: 2017-08-08
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although it is necessary to ensure a concave amount of about 1mm, the actual situation is that if it cannot be concaved under a rolling pressure of about 588MPa, it is not suitable for a good rolling material

Method used

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  • Pre-alloyed steel powder and carburized quenched material for high fatigue strength sintered body
  • Pre-alloyed steel powder and carburized quenched material for high fatigue strength sintered body
  • Pre-alloyed steel powder and carburized quenched material for high fatigue strength sintered body

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Embodiment Construction

[0023] The inventors of the present invention have conducted studies from various angles on a raw material powder (steel powder for sintered compact) that can achieve the above object. As a result, it has been found that by alloying Ni, Cr and Mo with iron powder in advance to form a pre-alloyed steel powder while ensuring the content balance, it is possible to obtain a sintered body exhibiting expected characteristics. Body steel powder, thereby completing the present invention. Hereinafter, the process of completion of the present invention and each requirement stipulated by the present invention will be described.

[0024] Methods for alloying a sintered body are roughly classified into the following two types according to the form of the raw material powder. One is a method of alloying strengthening elements (pre-alloyed steel powder) in the production stage of iron powder (smelting process). In addition, as another method, metal powders such as nickel (Ni), molybdenum (...

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Abstract

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)

Description

technical field [0001] The present invention relates to a prealloyed steel powder for obtaining a sintered body by powder metallurgy, and a carburized and quenched material obtained from such a prealloyed steel powder. In particular, it relates to prealloyed steel powder for obtaining a carburized and quenched material which can reduce the hardness of the sintered body after sintering, is easily plastically deformed, and exhibits high fatigue strength after carburizing and quenching treatment, and such carburizing and quenching material. Background technique [0002] In powder metallurgy, which uses iron powder as a main raw material to produce a sintered body, generally, iron powder containing the main raw material, and auxiliary raw material powders (graphite powder, alloy component powder, etc.) for improving the physical properties of the sintered body are used. etc.), and mixed powders such as lubricants. The sintered body formed by such powder metallurgy can achieve ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C22C38/00B21H5/00B22F1/00B22F3/10B22F3/24C21D1/06C21D9/32C22C38/44C23C8/22C23C8/66F16H55/06
CPCC21D1/06C22C33/0264C22C38/00C22C38/08C22C38/12C22C38/18C22C38/22C22C38/44B22F1/00B22F3/10B22F3/14C21D9/32
Inventor吉田真规有马慎弥
OwnerKOBE STEEL LTD