Method of manufacturing iron powder and iron powder manufactured thereby

Patent metadata

Field	Value
Publication number	US-10926332-B2
Application number	US-201715813986-A
Country	US
Kind code	B2
Filing date	Nov 15, 2017
Priority date	Apr 10, 2017
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

A method of manufacturing iron powder configured for improving a recovery rate of chromium using ingot including chromium in a content suitably higher than a target content at the time of manufacturing iron powder including chromium, may include preparing ingot further including chromium (Cr) so that a content of chromium (Cr) in the ingot is 1 to 30% higher than a target content of chromium (Cr) in finally produced iron powder; dissolving the ingot to prepare molten steel; forming iron powder by performing water atomization on the molten steel; and adjusting a content of carbon (C) in the iron powder by performing reduction treatment on the iron powder.

First claim

What is claimed is:

1. A method of manufacturing an iron-based powder including a target of 1.3 to 3.3 wt % chromium (Cr), the method comprising:
preparing an ingot including carbon (C): 0.1 to 0.4 wt %, silicon (Si): 0.1 to 0.25 wt %, and manganese (Mn): 0.3 wt % or less, further including chromium at a content 1 to 30% higher in relative terms to said target content; and including unavoidable impurities and a balance being iron (Fe);
dissolving the ingot to prepare molten steel and,
forming the iron-based powder by performing water atomization on the molten steel;
adjusting a content of carbon (C) in the iron-based powder by performing reduction treatment on the iron-based powder.

2. The method of claim 1 , wherein in the preparing of the molten steel, the ingot is dissolved under an air atmosphere.

3. The method of claim 1 , wherein in the adjusting of the content of carbon, the content of carbon (C) in the iron-based powder is adjusted to be 0.01 wt % or less by performing hydrogen reduction heat treatment on the iron-based powder.

4. The method of claim 3 , wherein in the adjusting of the content of carbon, the hydrogen reduction heat treatment is performed at 900 to 1200° C.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Yun Joon Chul
• Lyu Hyun Gon
• Choi Hyun Kyu
• Yu Ji Min

Classifications

• B22F1/06

  Metallic powder characterised by the shape of the particles (nanosized particles B22F1/054) · CPC title

• B22F1/00

  Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties · CPC title

• B22F2009/0848

  Melting process before atomisation · CPC title

• B22F2998/10

  Processes characterised by the sequence of their steps · CPC title

• B22F2301/35

  Iron · CPC title