EP0226912A2 - Procédé de fabrication d'acier de haute qualité - Google Patents
Procédé de fabrication d'acier de haute qualité Download PDFInfo
- Publication number
- EP0226912A2 EP0226912A2 EP86116948A EP86116948A EP0226912A2 EP 0226912 A2 EP0226912 A2 EP 0226912A2 EP 86116948 A EP86116948 A EP 86116948A EP 86116948 A EP86116948 A EP 86116948A EP 0226912 A2 EP0226912 A2 EP 0226912A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- melt
- oxygen
- carbon
- content
- bath
- 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.)
- Withdrawn
Links
- 229910000831 Steel Inorganic materials 0.000 title claims description 16
- 239000010959 steel Substances 0.000 title claims description 16
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 43
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 22
- 239000000155 melt Substances 0.000 claims abstract description 21
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000001301 oxygen Substances 0.000 claims abstract description 20
- 239000002893 slag Substances 0.000 claims abstract description 13
- 238000007664 blowing Methods 0.000 claims abstract description 11
- 239000003245 coal Substances 0.000 claims abstract description 5
- 238000005261 decarburization Methods 0.000 claims description 8
- 238000005255 carburizing Methods 0.000 claims description 4
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims description 2
- 239000003830 anthracite Substances 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000012159 carrier gas Substances 0.000 claims description 2
- 230000003009 desulfurizing effect Effects 0.000 claims description 2
- 239000011261 inert gas Substances 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 10
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 9
- 239000011574 phosphorus Substances 0.000 description 9
- 239000000047 product Substances 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/32—Blowing from above
Definitions
- the invention relates to a method for producing high-quality steel, in the context of an oxygen inflation process.
- high-quality is a steel that has the lowest possible levels of phosphorus, sulfur and non-metallic inclusions.
- One method of achieving the desired carbon content in a melt is to stop decarburization in good time.
- the disadvantage of this method is that it does not allow steels with a high carbon content and at the same time a low phosphorus content to be obtained.
- pretreatment of the pig iron is essential.
- Such pretreatments which are mainly explained by Japanese steel manufacturers in numerous publications, take place outside the converter, in stationary or in mobile pans and require a high level of equipment.
- the necessary temperature losses must be accepted or compensated for by heating units.
- the applicant has set itself the task of developing a process that allows the production of high quality steel, the content of non-metallic inclusions is reduced to a minimum.
- the first step is decarburization in the converter, by blowing oxygen, with the addition of the necessary additives for slagging silicon and phosphorus.
- Decarburization generates heat and the slag becomes reactive as a result of oxygen absorption, with a certain proportion of the phosphorus being absorbed into the slag.
- the decarburization is carried out up to a carbon content below 0.10% C, preferably below 0.05% C, regardless of which carbon content is targeted in the finished steel.
- the second step is a treatment of the essentially decarburized and oxygen-rich bath, in the converter, with carbon.
- This step is carried out by introducing comminuted coal, preferably anthracite, into the melt at the greatest possible speed. This leads to an extremely violent reaction in which the metal bath is simultaneously deoxidized and carburized. It should be emphasized that, in contrast to conventional deoxidation in the pan using a Kombina tion of coal, ferromanganese, ferrosilicon, aluminum, and the like. the deoxidation product here is exclusively gaseous and therefore cannot lead to inclusions. The large amounts of carbon monoxide formed in this way cause the metal phase to swirl vigorously with the slag phase.
- the second process step is terminated at an oxygen content of approximately 250-400 ppm 0.
- the carbon content of the melt is still very low, about 0.04-0.07% C.
- the added carbon primarily deoxidizes the melt before carburization occurs.
- the product Cx0 is reduced to the thermodynamic equilibrium value which corresponds to the respective temperature and gas pressure conditions in the metal bath.
- a "Na 2 O carrier, ie suitable compounds which release Na 2 0 during thermal decomposition, is added, for example by blowing it in together with the carbon.
- the third process step consists in treating the largely deoxidized and partially carburized bath, taking into account the prevailing conditions with regard to bath temperature, oxygen content, carbon content, i.e. that the product C x 0 at the prevailing temperature is also a determining factor in the subsequent procedure.
- the procedure is geared towards introducing a melt which is as low in oxygen as possible and whose carbon content is as close as possible to the pan which does not have to be provided with heating units should be below the targeted final concentration.
- the deoxidation should be carried out as far as possible using carbon, with only carbon monoxide and carbon dioxide being produced.
- the melt can be further treated with carbon in the converter, specifically until the desired final concentration is reached. If the latter is, for example, about 0.10% C, the corresponding oxygen content is about 200 ppm 0. The rack is then tapped into the pan.
- This passivity also allows the CxO balance in the converter to be added by adding e.g. Ferromanganese, by blowing into the steel bath, i.e. With the carbon content remaining the same, the oxygen content of the bath can be reduced even further and this without rephosphorization. Solid deoxidation products do occur, but due to the still high steel temperature and the much larger bath diameter: bath height ratio compared to a ladle, these deoxidation products do not lead to inclusions in the finished steel, but are completely eliminated from the melt and absorbed into the slag.
- e.g. Ferromanganese e.g. Ferromanganese
- the melt pretreated in this way shows particularly good behavior if it is treated in the pan with a deoxidizing and at the same time desulfurizing agent, preferably metallic calcium and synthetic slags.
- a deoxidizing and at the same time desulfurizing agent preferably metallic calcium and synthetic slags.
- desulfurizing agent preferably metallic calcium and synthetic slags.
- the method according to the invention is aimed at the production of both semi-calmed and fully calmed steels.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU86225A LU86225A1 (de) | 1985-12-23 | 1985-12-23 | Verfahren zum herstellen von hochwertigem stahl |
| LU86225 | 1985-12-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0226912A2 true EP0226912A2 (fr) | 1987-07-01 |
| EP0226912A3 EP0226912A3 (fr) | 1989-04-26 |
Family
ID=19730608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP86116948A Withdrawn EP0226912A3 (fr) | 1985-12-23 | 1986-12-05 | Procédé de fabrication d'acier de haute qualité |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0226912A3 (fr) |
| JP (1) | JPS62158811A (fr) |
| AU (1) | AU590801B2 (fr) |
| BR (1) | BR8605894A (fr) |
| CA (1) | CA1288954C (fr) |
| LU (1) | LU86225A1 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3805410A1 (fr) * | 2019-10-11 | 2021-04-14 | SMS Group GmbH | Procédé de déphosphoration d'acier fondu pendant le processus d'affinage |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3702243A (en) * | 1969-04-15 | 1972-11-07 | Nat Steel Corp | Method of preparing deoxidized steel |
| AU6823981A (en) * | 1980-03-21 | 1981-10-15 | Nippon Steel Corporation | Multi-stage steel making |
| LU84168A1 (de) * | 1982-05-25 | 1984-03-07 | Arbed | Verfahren zum aufkohlen von metallschmelzen |
| LU85363A1 (fr) * | 1984-05-15 | 1986-01-29 | Arbed | Dispositif d'adaptation pour tuyere d'acceleration de particules solides |
-
1985
- 1985-12-23 LU LU86225A patent/LU86225A1/de unknown
-
1986
- 1986-10-23 AU AU64325/86A patent/AU590801B2/en not_active Ceased
- 1986-11-05 CA CA000522224A patent/CA1288954C/fr not_active Expired - Lifetime
- 1986-12-02 BR BR8605894A patent/BR8605894A/pt unknown
- 1986-12-05 EP EP86116948A patent/EP0226912A3/fr not_active Withdrawn
- 1986-12-22 JP JP30403586A patent/JPS62158811A/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3805410A1 (fr) * | 2019-10-11 | 2021-04-14 | SMS Group GmbH | Procédé de déphosphoration d'acier fondu pendant le processus d'affinage |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0226912A3 (fr) | 1989-04-26 |
| JPS62158811A (ja) | 1987-07-14 |
| AU6432586A (en) | 1987-06-25 |
| AU590801B2 (en) | 1989-11-16 |
| BR8605894A (pt) | 1987-08-25 |
| CA1288954C (fr) | 1991-09-17 |
| LU86225A1 (de) | 1987-07-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
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| PUAL | Search report despatched |
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| AK | Designated contracting states |
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| 17P | Request for examination filed |
Effective date: 19891007 |
|
| 17Q | First examination report despatched |
Effective date: 19910117 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
| 18W | Application withdrawn |
Withdrawal date: 19910518 |
|
| R18W | Application withdrawn (corrected) |
Effective date: 19910518 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: SCHLEIMER, FRANCOIS |