Steel for surface hardening for machine structural use and part for machine structural use
US-9777343-B2 · Oct 3, 2017 · US
Method for producing surface-hardened material
US11332818B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11332818-B2 |
| Application number | US-201917270960-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 23, 2019 |
| Priority date | Aug 31, 2018 |
| Publication date | May 17, 2022 |
| Grant date | May 17, 2022 |
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Abstract
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A method for producing a surface-hardened material, comprising: an immersion step of immersing an iron steel material having nitrogen attached in the form of a solid solution on the surface thereof in a melt containing a chloride at a temperature ranging from 650° C. to 900° C.; and a cooling step of cooling the immersed iron steel material to a temperature equal to or lower than a martensitic transformation start temperature at a cooling rate equal to or higher than a lower critical cooling rare at which martensitic transformation starts.
First claim
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The invention claimed is: 1. A method for producing a surface-hardened material, comprising: an immersion step of immersing a steel material of which a surface is in a form of a solid solution of nitrogen in a molten material containing a chloride within a range of 650° C. to 900° C.; and a cooling step of cooling the immersed steel material to a martensitic transformation starting temperature or less at a cooling rate equal to or higher than a lower critical cooling rate at which martensitic transformation starts. 2. The method for producing a surface-hardened material according to claim 1 , wherein the steel material of which a surface is in a form of a solid solution of nitrogen further contains an iron-nitrogen compound layer as a surface layer. 3. The method for producing a surface-hardened material according to claim 1 , further comprising a nitriding step of forming a solid solution of nitrogen on the surface of the steel material by nitriding the steel material. 4. The method for producing a surface-hardened material according to claim 3 , further comprising a carburizing step of carburizing the steel material before the nitriding step. 5. The method for producing a surface-hardened material according to claim 1 , wherein the steel material of which a surface is in a form of a solid solution of nitrogen is also the steel material of which a surface is in a form of a solid solution of carbon.
Assignees
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Classifications
Methods of annealing · CPC title
of ferrous surfaces · CPC title
Hardening (C21D1/02 takes precedence); Quenching with or without subsequent tempering (quenching devices C21D1/62) · CPC title
Soft annealing, e.g. spheroidising · CPC title
containing silicon · CPC title
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- What does patent US11332818B2 cover?
- A method for producing a surface-hardened material, comprising: an immersion step of immersing an iron steel material having nitrogen attached in the form of a solid solution on the surface thereof in a melt containing a chloride at a temperature ranging from 650° C. to 900° C.; and a cooling step of cooling the immersed iron steel material to a temperature equal to or lower than a martensitic …
- Who is the assignee on this patent?
- Nihon Parkerizing
- What technology area does this patent fall under?
- Primary CPC classification C23C8/50. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue May 17 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).