GB778987A - Improvements in or relating to methods of making rolled ferrosilicon alloys - Google Patents
Improvements in or relating to methods of making rolled ferrosilicon alloysInfo
- Publication number
- GB778987A GB778987A GB26861/55A GB2686155A GB778987A GB 778987 A GB778987 A GB 778987A GB 26861/55 A GB26861/55 A GB 26861/55A GB 2686155 A GB2686155 A GB 2686155A GB 778987 A GB778987 A GB 778987A
- Authority
- GB
- United Kingdom
- Prior art keywords
- nitrogen
- alloy
- gas stream
- hydrogen
- per cent
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
A process of treating ferro silicon containing 2-5 per cent silicon comprises, prior to cold rolling, heating the alloy to above 400 DEG C. in a gas stream containing a nitrogen compound whereby nitrogen is dissolved in the alloy to between 0.01 per cent and 0.14 per cent without the formation of austenite or nitride, and, after cold rolling to the final thickness, the nitrogen is removed by annealing in a hydrogen containing atmosphere free from nitrogen and any substances having an oxidizing effect on the alloy. The gas stream may be a mixture of hydrogen and ammonia and may also contain ammonium chloride. The heating in the gas stream may be at a temperature between 500 DEG C. and 600 DEG C. and the final anneal to remove the nitrogen may be in two stages, between 500 DEG C. and 800 DEG C. and between 900 DEG C. and 1000 DEG C. in an atmosphere of hydrogen.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL778987X | 1954-09-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB778987A true GB778987A (en) | 1957-07-17 |
Family
ID=19830058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB26861/55A Expired GB778987A (en) | 1954-09-23 | 1955-09-20 | Improvements in or relating to methods of making rolled ferrosilicon alloys |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB778987A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2986485A (en) * | 1958-07-28 | 1961-05-30 | Gen Electric | Annealing process for magnetic steel strip |
-
1955
- 1955-09-20 GB GB26861/55A patent/GB778987A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2986485A (en) * | 1958-07-28 | 1961-05-30 | Gen Electric | Annealing process for magnetic steel strip |
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