Titanium alloy member and method for manufacturing the same
US-2017356076-A1 · Dec 14, 2017 · US
Method for manufacturing ferritic stainless steel product
US10508331B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10508331-B2 |
| Application number | US-201916294016-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 6, 2019 |
| Priority date | Sep 12, 2016 |
| Publication date | Dec 17, 2019 |
| Grant date | Dec 17, 2019 |
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Abstract
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A method for manufacturing a ferritic stainless steel product includes forming a carburized layer on a workpiece made of ferritic stainless steel, and forming a nitrided layer on a surface of the workpiece by heating the workpiece at a temperature equal to or higher than a transformation point of the ferritic stainless steel in an atmosphere containing an N2 gas.
First claim
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What is claimed is: 1. A method for manufacturing a ferritic stainless steel product, the method comprising: forming a carburized layer on a workpiece made of ferritic stainless steel; and forming a nitrided layer on a surface of the workpiece by heating the workpiece at a temperature equal to or higher than a transformation point of the ferritic stainless steel in an atmosphere containing an N 2 gas, wherein a carbon concentration defined by A mass % of the workpiece before forming the carburized layer, a surface carbon concentration defined by X C mass % of the carburized layer and a thickness defined by L C millimeters (mm) of the carburized layer after forming the carburized layer and before forming the nitrided layer, and a thickness defined by L N mm of the carburized layer after forming the nitrided layer satisfy a relationship of (X C −A)×L C ≤(0.3−A)×L N . 2. The method for manufacturing the ferritic stainless steel product according to claim 1 , the method further comprising cooling the workpiece by quenching the workpiece having the nitrided layer. 3. The method for manufacturing the ferritic stainless steel product according to claim 1 , wherein the carbon concentration defined by A mass % of the workpiece before forming the carburized layer, the surface carbon concentration defined by X C mass % of the carburized layer and the thickness defined by L C mm of the carburized layer after forming the carburized layer and before forming the nitrided layer, and the thickness defined by L N mm of the carburized layer after forming the nitrided layer satisfy a relationship of (0.2−A)×L N ≤(X C −A)×L C . 4. The method for manufacturing the ferritic stainless steel product according to claim 1 , wherein the forming the carburized layer includes: heating an interior of a heating furnace in which the workpiece is disposed under a reduced pressure condition up to a carburizing temperature; and supplying a carburizing gas into the heating furnace. 5. The method for manufacturing the ferritic stainless steel product according to claim 4 , wherein the carburizing gas contains at least an unsaturated hydrocarbon gas.
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- What does patent US10508331B2 cover?
- A method for manufacturing a ferritic stainless steel product includes forming a carburized layer on a workpiece made of ferritic stainless steel, and forming a nitrided layer on a surface of the workpiece by heating the workpiece at a temperature equal to or higher than a transformation point of the ferritic stainless steel in an atmosphere containing an N2 gas.
- Who is the assignee on this patent?
- Denso Corp
- What technology area does this patent fall under?
- Primary CPC classification C23C8/34. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Dec 17 2019 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).