JPS6431926A - Manufacture of heat-treated steel parts - Google Patents
Manufacture of heat-treated steel partsInfo
- Publication number
- JPS6431926A JPS6431926A JP18661787A JP18661787A JPS6431926A JP S6431926 A JPS6431926 A JP S6431926A JP 18661787 A JP18661787 A JP 18661787A JP 18661787 A JP18661787 A JP 18661787A JP S6431926 A JPS6431926 A JP S6431926A
- Authority
- JP
- Japan
- Prior art keywords
- surface layer
- shot
- depth
- slack
- slack quenched
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
PURPOSE:To improve the fatigue strength of parts, by applying shot peening to steel parts in which the depth of a slack quenched surface layer is regulated practically to a specific value or below while increasing shot hardness and shot grain-projecting speed to values within specific ranges, respectively. CONSTITUTION:Shot peening is applied to steel parts in which the depth of a slack quenched surface layer (slack quenched layer attendant on intergranular oxidation) is regulated to <=about 15mu, under the conditions of HRC50-58 shot hardness and 60-120m/sec shot grain-projecting speed. As to the method for controlling the depth of the slack quenched surface layer to <=about 15mu, for example, a carbonitriding method in which the hardening of a surface layer is improved by adding trace amounts of nitrogen to a surface and a method in which the hardenability of material is improved by adding alloying elements by the amounts larger than those added in the case of the ordinary steel for carbonitriding (SCr420, etc.) are cited, or further, a method in which the internal oxidation of Cr and Mn causing the formation of a slack quenched surface layer is inhibited by shortening carburizing time as compared with that in the ordinary case, a method in which vacuum carburizing is applied, etc., are cited.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62186617A JPH07109004B2 (en) | 1987-07-28 | 1987-07-28 | Method for manufacturing heat-treated steel parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62186617A JPH07109004B2 (en) | 1987-07-28 | 1987-07-28 | Method for manufacturing heat-treated steel parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6431926A true JPS6431926A (en) | 1989-02-02 |
| JPH07109004B2 JPH07109004B2 (en) | 1995-11-22 |
Family
ID=16191713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62186617A Expired - Fee Related JPH07109004B2 (en) | 1987-07-28 | 1987-07-28 | Method for manufacturing heat-treated steel parts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07109004B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61265271A (en) * | 1985-05-18 | 1986-11-25 | Toyota Motor Corp | Shot peening method of cemented product |
-
1987
- 1987-07-28 JP JP62186617A patent/JPH07109004B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61265271A (en) * | 1985-05-18 | 1986-11-25 | Toyota Motor Corp | Shot peening method of cemented product |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07109004B2 (en) | 1995-11-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |