GB852265A - Improvements in or relating to iron and ferrous alloys - Google Patents
Improvements in or relating to iron and ferrous alloysInfo
- Publication number
- GB852265A GB852265A GB407858A GB407858A GB852265A GB 852265 A GB852265 A GB 852265A GB 407858 A GB407858 A GB 407858A GB 407858 A GB407858 A GB 407858A GB 852265 A GB852265 A GB 852265A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coating
- article
- annealing
- iron
- metal
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/14766—Fe-Si based alloys
- H01F1/14775—Fe-Si based alloys in the form of sheets
- H01F1/14783—Fe-Si based alloys in the form of sheets with insulating coating
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
- C21D3/02—Extraction of non-metals
- C21D3/08—Extraction of nitrogen
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
- C21D8/1283—Application of a separating or insulating coating
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Electromagnetism (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Dispersion Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Power Engineering (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
A method of reducing the nitrogen content of iron or ferrous alloy articles comprises coating the article with a layer of a nitrogen-accepting metal and annealing the article under such conditions that some or all of the nitrogen enters, and is retained by, the coating but prevents diffusion of the coating metal into the article. The coating layer may be removed after cooling. The coating metal may be Al, Cr, Ta, Ti, or V and may be applied electrolytically or by vapour deposition to a thickness depending on the thickness of the article and the desired reduction in nitrogen content. The annealing may comprise heating to 400 DEG C. to 800 DEG C. for two hours followed by cooling at a rate less than 100 DEG C. per hour. The coating metal may be applied prior to any mechanical working before annealing. Curves are given for Al coated on iron and show the relationship between the nitrogen content of the base and the thickness of coating on each side, and between the annealing time and the temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB407858A GB852265A (en) | 1958-02-07 | 1958-02-07 | Improvements in or relating to iron and ferrous alloys |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB407858A GB852265A (en) | 1958-02-07 | 1958-02-07 | Improvements in or relating to iron and ferrous alloys |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB852265A true GB852265A (en) | 1960-10-26 |
Family
ID=9770320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB407858A Expired GB852265A (en) | 1958-02-07 | 1958-02-07 | Improvements in or relating to iron and ferrous alloys |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB852265A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1245402B (en) * | 1961-12-01 | 1967-07-27 | Konink Nl Hoogovens En Staalfa | Process for removing free nitrogen from steel plates |
| WO2014180646A1 (en) * | 2013-05-10 | 2014-11-13 | Siemens Aktiengesellschaft | Electrical steel sheet with a layer improving the electrical insulation and method for the production thereof |
-
1958
- 1958-02-07 GB GB407858A patent/GB852265A/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1245402B (en) * | 1961-12-01 | 1967-07-27 | Konink Nl Hoogovens En Staalfa | Process for removing free nitrogen from steel plates |
| WO2014180646A1 (en) * | 2013-05-10 | 2014-11-13 | Siemens Aktiengesellschaft | Electrical steel sheet with a layer improving the electrical insulation and method for the production thereof |
| CN105190794A (en) * | 2013-05-10 | 2015-12-23 | 西门子公司 | Electrical steel sheet with a layer improving the electrical insulation and method for the production thereof |
| AU2014264849B2 (en) * | 2013-05-10 | 2016-10-13 | Innomotics Gmbh | Electrical steel sheet with a layer improving the electrical insulation and method for the production thereof |
| RU2635501C2 (en) * | 2013-05-10 | 2017-11-13 | Сименс Акциенгезелльшафт | Electrical steel sheet steel with insulation-improving coating and method of its production |
| US9959959B2 (en) | 2013-05-10 | 2018-05-01 | Siemens Aktiengesellschaft | Magnetic steel sheet having a layer improving the electrical insulation and method for the production thereof |
| CN105190794B (en) * | 2013-05-10 | 2018-12-07 | 西门子公司 | Electrical sheet and its manufacturing method with the layer for improving electrical isolation |
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