Claims
- 1. A method for producing a ferrous sintered alloy product comprising the steps of:
- preparing metal powder mixture primarily comprising iron;
- compacting said powder mixture to obtain a powder compact;
- sintering said powder compact to obtain a sintered body;
- subjecting sub-zero treatment to said sintered body; and,
- tempering said sub-zero treated sintered body, whereby the resultant sintered alloy product is free from retained austenite.
- 2. The method as defined in claim 1, wherein said sub-zero treatment is performed at a temperature not more than -80.degree. C.
- 3. The method as defined in claim 1, wherein said sub-zero treatment is performed at a temperature not more than -100.degree. C.
Priority Claims (1)
Number |
Date |
Country |
Kind |
61-291364 |
Dec 1986 |
JPX |
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Parent Case Info
This is a Division of application Ser. No. 07/125,324 filed Nov.. 25, 1987.
US Referenced Citations (16)
Non-Patent Literature Citations (3)
Entry |
Japanese Laid Open Patent Publication No. 56-5955, Jan. 22, 1981. |
Metal Surface Treatment Handbook, published by Nikkan Kogyo Shinbunsha, pp. 104-105 (Oct. 25, 1983). |
Metal Heat Treatment Handbook, published by Nikkan Kogyo Shinbunsha, pp. 74-75 (Oct. 30, 1985). |
Divisions (1)
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Number |
Date |
Country |
Parent |
125324 |
Jan 1987 |
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