BE519644A - - Google Patents
Info
- Publication number
- BE519644A BE519644A BE519644DA BE519644A BE 519644 A BE519644 A BE 519644A BE 519644D A BE519644D A BE 519644DA BE 519644 A BE519644 A BE 519644A
- Authority
- BE
- Belgium
- Prior art keywords
- bath
- gas
- steel
- slag
- treatment
- Prior art date
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 239000002893 slag Substances 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 230000000630 rising Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
Description
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PROCEDE POUR L'AMELIORATION DE L'ACIER.
La présente invention concerne l'amélioration des aciers ou de leurs alliages en traitant les bains de fusion.
Suivant l'invention, un gaz ne réagissant pas avec le bain acierlaitier est introduit dans le bain de fusion recouvert d'un laitier réagissant et une dépression est créée au-dessus du dit bain. Un tel traitement est appliqué principalement aux bains d'aciers ou d'alliages d'aciers qui sont déjà à leur stade final de fabrication. Pour faciliter la création de la dépression, le traitement est effectué, de préférence, dans des récipients de dépression, situés en dehors des dispositifs de fusion. De préférence, l'arrivée de gaz est située à la partie inférieure du bain. Lors de l'uilisation du traitement proposé, les bains de fusion sont rapidement et parfaitement épurés.
Le gaz introduit provoque un fort mouvement du bain de manière que les réactions avec le laitier sont amplifiées et accélérées; ces actions étant largement favorisées par la dépression. En raison de la dépression, les bulles de gaz montant dans le bain reçoivent une expansion et un volume accrus. Pour cette raison, la consommation en gaz est de loin plus réduite qu'avec une pression normale.
Les masses plus importantes de gaz qui seraient introduites au-dessus du bain avec une pression normale, agrandiraient en outre, les surfaces de contact entre le laitier, et même entre l'acier, et l'air libre se trouvant au-dessus de ces derniers, à un point tel qu'une ac- tion nocive pourrait se produire ; ce cas il serait même préférable de travailler avec des faibles masses de gaz, tout en acceptant que le bain soit épuré plus lentement et moins parfaitement.
Par contre, lors du traitement suivant l'invention, l'oxygène de l'air libre ne peut entrer en contact ni avec le laitier, ni avec le bain d'acier, on évite ainsi que l'acier s'enrichisse en oxydule de fer ou subisse, de façon indésirable, une perte en carbone tout en formant du CO. En outre, l'enrichissement de l'acier en azote ou en hydrogène est exclu.
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PROCESS FOR THE IMPROVEMENT OF STEEL.
The present invention relates to the improvement of steels or their alloys by treating molten baths.
According to the invention, a gas which does not react with the slag bath is introduced into the molten bath covered with a reacting slag and a vacuum is created above said bath. Such a treatment is applied mainly to steel baths or steel alloys which are already at their final stage of manufacture. To facilitate the creation of the vacuum, the treatment is preferably carried out in vacuum vessels, located outside the melters. Preferably, the gas inlet is located at the lower part of the bath. When using the proposed treatment, the melting baths are quickly and perfectly cleaned.
The gas introduced causes a strong movement of the bath so that the reactions with the slag are amplified and accelerated; these actions being largely favored by depression. Due to the vacuum, the gas bubbles rising in the bath receive increased expansion and volume. For this reason, the gas consumption is much lower than with normal pressure.
The larger masses of gas which would be introduced above the bath with normal pressure, would also enlarge the contact surfaces between the slag, and even between the steel, and the free air located above these. last, to such an extent that a harmful action could occur; in this case it would even be preferable to work with small masses of gas, while allowing the bath to be purified more slowly and less perfectly.
On the other hand, during the treatment according to the invention, the oxygen in the free air cannot come into contact with either the slag or the steel bath, and the steel is thus prevented from becoming enriched in oxides of iron or undesirably undergoes carbon loss while forming CO. In addition, the enrichment of the steel with nitrogen or hydrogen is excluded.
Claims (1)
Publications (1)
Publication Number | Publication Date |
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BE519644A true BE519644A (en) |
Family
ID=155804
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE519644D BE519644A (en) |
Country Status (1)
Country | Link |
---|---|
BE (1) | BE519644A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1171940B (en) * | 1959-03-24 | 1964-06-11 | Rheinstahl Huettenwerke Ag | Device for cleaning steel bars by vacuum treatment |
DE1258434B (en) * | 1958-07-28 | 1968-01-11 | Mannesmann Ag | Device and method for introducing inert gases into a steel melt |
DE1270063B (en) * | 1958-12-02 | 1968-06-12 | Finkl & Sons Co | Process for cleaning steel melts and device for carrying out the process |
-
0
- BE BE519644D patent/BE519644A/fr unknown
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1258434B (en) * | 1958-07-28 | 1968-01-11 | Mannesmann Ag | Device and method for introducing inert gases into a steel melt |
DE1270063B (en) * | 1958-12-02 | 1968-06-12 | Finkl & Sons Co | Process for cleaning steel melts and device for carrying out the process |
DE1171940B (en) * | 1959-03-24 | 1964-06-11 | Rheinstahl Huettenwerke Ag | Device for cleaning steel bars by vacuum treatment |
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