IP Library › Granted Patent US 12,378,645
Granted Patent B2
US 12,378,645 · App. 17/594,163 · Granted Aug 5, 2025

Iron-based mixed powder for powder metallurgy and iron-based sintered body

Inventors: Takuya Takashita (Tokyo, JP); Nao Nasu (Tokyo, JP); Akio Kobayashi (Tokyo, JP)
Assignee: JFE STEEL CORPORATION
C22C33/0207B22F1/00B22F1/09B22F1/10B22F1/12B22F3/16B22F3/24C22C38/12B22F2003/248B22F2301/10B22F2301/35B22F2302/40
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Quick Facts
Patent No.
US 12,378,645
App. No.
17/594,163
Granted
Aug 5, 2025
Kind
B2
Abstract

Provided is a steel strip joining method that can appropriately evaluate risk of a fracture in a joined part and prevent a fracture more reliably. An iron-based mixed powder for powder metallurgy comprises: an iron-based alloy powder; and an alloying powder, wherein the iron-based alloy powder contains Mo: 0.2 mass % or more and 1.5 mass % or less, the alloying powder contains a graphite powder and a copper powder, a ratio of a mass of the graphite powder to a total mass of the iron-based alloy powder and the alloying powder is 0.10 mass % to 1.0 mass %, a ratio of a mass of the copper powder to the total mass of the iron-based alloy powder and the alloying powder is 0.5 mass % to 3.0 mass %, and the copper powder has an average particle size of 25 μm or less, and a specific surface area of 0.30 m 2 /g or more.

Claims (21)

1. An iron-based mixed powder for powder metallurgy, comprising:

an iron-based alloy powder; and

an alloying powder,

wherein the iron-based alloy powder contains Mo: 0.2 mass % or more and 1.5 mass % or less,

the alloying powder contains a graphite powder and a copper powder,

a ratio of a mass of the graphite powder to a total mass of the iron-based alloy powder and the alloying powder is 0.10 mass % to 1.0 mass %,

a ratio of a mass of the copper powder to the total mass of the iron-based alloy powder and the alloying powder is 0.5 mass % to 3.0 mass %, and

the copper powder has an average particle size of 15 μm or more and 25 μm or less, and a specific surface area of 0.30 m 2 /g to 0.60 m 2 /g, the average particle size of the copper powder being defined as a median size of primary particles of the copper powder measured by a laser diffraction-scattering type particle size distribution measurement device.

2. The iron-based mixed powder for powder metallurgy according to claim 1 , wherein the iron-based alloy powder has a chemical composition containing Mo: 0.2 mass % or more and 1.5 mass % or less with a balance consisting of Fe and inevitable impurities.

3. The iron-based mixed powder for powder metallurgy according to claim 2 , further comprising

a lubricant.

4. An iron-based sintered body obtainable by pressing and sintering the iron-based mixed powder for powder metallurgy according to claim 3 .

5. An iron-based sintered body obtainable by pressing, sintering, and heat-treating the iron-based mixed powder for powder metallurgy according to claim 3 .

6. An iron-based sintered body obtainable by pressing and sintering the iron-based mixed powder for powder metallurgy according to claim 2 .

7. An iron-based sintered body obtainable by pressing, sintering, and heat-treating the iron-based mixed powder for powder metallurgy according to claim 2 .

8. The iron-based mixed powder for powder metallurgy according to claim 1 , further comprising

a lubricant.

9. An iron-based sintered body obtainable by pressing and sintering the iron-based mixed powder for powder metallurgy according to claim 8 .

10. An iron-based sintered body obtainable by pressing, sintering, and heat-treating the iron-based mixed powder for powder metallurgy according to claim 8 .

11. An iron-based sintered body obtainable by pressing and sintering the iron-based mixed powder for powder metallurgy according to claim 1 .

12. An iron-based sintered body obtainable by pressing, sintering, and heat-treating the iron-based mixed powder for powder metallurgy according to claim 1 .

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 5, 2021
From: TAKASHITA, TAKUYA; NASU, NAO; KOBAYASHI, AKIO
To: JFE STEEL CORPORATION
Reel/Frame 057709/0207 →
Priority Claims (1)
JP 2019-072867 · Apr 5, 2019 · national
Continuity (1)
Related Publication 20220161321A1 · May 26, 2022
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