JPS565953A - Carbonitriding steel - Google Patents
Carbonitriding steelInfo
- Publication number
- JPS565953A JPS565953A JP8143479A JP8143479A JPS565953A JP S565953 A JPS565953 A JP S565953A JP 8143479 A JP8143479 A JP 8143479A JP 8143479 A JP8143479 A JP 8143479A JP S565953 A JPS565953 A JP S565953A
- Authority
- JP
- Japan
- Prior art keywords
- carbonitriding
- steel
- content
- netlike
- deterioration
- 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.)
- Pending
Links
Landscapes
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
PURPOSE: To provide a carbonitriding steel free from precipitation of netlike Cr nitride due to carbonitriding and deterioration of the bending fatigue strength by lowering the Cr content of a carbonitriding case hardening Cr steel and adding a specified very small amount of B.
CONSTITUTION: This carbonitriding steel contains 0.17W0.28% C, 0.15W0.35% Si, 0.55W0.75% Mn, 0.40W0.70% Cr, >0.0005% B, <0.02% P and <0.02% S. Machine parts, etc. made of this steel are carbonitrided by adding 5W20% ammonia gas together with carburizing carrier. Since the Cr content of this steel is lower than that of a conventional carbonitriding Cr steel, no netlike Cr nitride is precipitated in carbonitriding to prevent the bending fatigue strength of the parts from lowering. Deterioration of the hardenability due to the lowered Cr content is compensated with the addition of such a very small amount of B.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8143479A JPS565953A (en) | 1979-06-29 | 1979-06-29 | Carbonitriding steel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8143479A JPS565953A (en) | 1979-06-29 | 1979-06-29 | Carbonitriding steel |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS565953A true JPS565953A (en) | 1981-01-22 |
Family
ID=13746274
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8143479A Pending JPS565953A (en) | 1979-06-29 | 1979-06-29 | Carbonitriding steel |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS565953A (en) |
-
1979
- 1979-06-29 JP JP8143479A patent/JPS565953A/en active Pending
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