CN1676621A - Suboxide steel production method - Google Patents
Suboxide steel production method Download PDFInfo
- Publication number
- CN1676621A CN1676621A CN 200410017309 CN200410017309A CN1676621A CN 1676621 A CN1676621 A CN 1676621A CN 200410017309 CN200410017309 CN 200410017309 CN 200410017309 A CN200410017309 A CN 200410017309A CN 1676621 A CN1676621 A CN 1676621A
- Authority
- CN
- China
- Prior art keywords
- steel
- oxygen
- slag
- molten steel
- ladle
- 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.)
- Granted
Links
- 239000010959 steel Substances 0.000 title claims abstract description 87
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 85
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 239000002893 slag Substances 0.000 claims abstract description 67
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 58
- 239000001301 oxygen Substances 0.000 claims abstract description 57
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 49
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 38
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 26
- 239000003607 modifier Substances 0.000 claims abstract description 17
- 238000007664 blowing Methods 0.000 claims abstract description 16
- 229910052742 iron Inorganic materials 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000007670 refining Methods 0.000 claims abstract description 11
- 238000003723 Smelting Methods 0.000 claims abstract description 8
- 238000009849 vacuum degassing Methods 0.000 claims abstract description 7
- 238000005261 decarburization Methods 0.000 claims description 27
- 229910052799 carbon Inorganic materials 0.000 claims description 17
- 238000010079 rubber tapping Methods 0.000 claims description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- 229910052593 corundum Inorganic materials 0.000 claims description 6
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 6
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 2
- 230000007480 spreading Effects 0.000 claims description 2
- 238000002203 pretreatment Methods 0.000 claims 1
- 238000009489 vacuum treatment Methods 0.000 abstract description 5
- 238000005275 alloying Methods 0.000 abstract description 4
- 238000003763 carbonization Methods 0.000 abstract 2
- 238000010438 heat treatment Methods 0.000 abstract 2
- 238000007254 oxidation reaction Methods 0.000 abstract 1
- 239000007921 spray Substances 0.000 abstract 1
- 230000008569 process Effects 0.000 description 9
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 8
- 235000011941 Tilia x europaea Nutrition 0.000 description 8
- 239000004571 lime Substances 0.000 description 8
- 239000004411 aluminium Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 5
- 229910000655 Killed steel Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000005262 decarbonization Methods 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 4
- 230000023556 desulfurization Effects 0.000 description 4
- -1 automobile plates Substances 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 235000015468 Lycium chinense Nutrition 0.000 description 1
- 244000241872 Lycium chinense Species 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- 229910001295 No alloy Inorganic materials 0.000 description 1
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 description 1
- QRSFFHRCBYCWBS-UHFFFAOYSA-N [O].[O] Chemical compound [O].[O] QRSFFHRCBYCWBS-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Abstract
This invention is low-oxygen steel facture, including the following procedure: a. pre-treat the iron melt; b. converter smelting, blow-off [C]b=0.03-0.06%, blow-off free oxygen F[O]E=700-1100ppm, blow-off temperature TE>=1660deg.C; deoxidation and alloying is not needed when iron outputting to assure the steel ladle and molten steel [C]LD 0.02-0.06%, molten steel free oxygen 450-750ppm; the temperature of molten steel TLD is up to the temperature of non-oxygen blowing Alto heating in vacuum treatment; c. vacuum degassing refining, de-carbonization and component and temperature adjusting; the steel ladle and molten steel before reefing and de-carbonization is 1590-1620deg.C to decrease the oxygen-blowing Alto heating; d. iron outputting, add slag modifier; e. mould: spray the aluminum slag modifier, on the steel ladle and molten steel. This invention can reduce the oxygen content of middle ladle of molten steel; and the RH-OB oxygen amount, de-oxidation aluminum consumption and slag modifier cost are all reduced.
Description
Technical Field
The invention belongs to the field of ferrous metallurgy, and particularly relates to a method for producing low-oxygen steel.
Background
The products such as automobile plates, steel pop-top cans and the like have extremely high requirements on the surface quality and the deep drawing forming processing performance of steel, and are widely adopted and low in costCarbon, ultra low carbon aluminum killed steel. E.g. IF steel, [ C]]<40ppm, even if required [ C]Less than 20 ppm; while the T.O (total oxygen) content is as low as possible to reduce Al2O3Oxide-like inclusions adversely affect the inherent quality and workability of the steel. As shown in fig. 1, t.o (total oxygen) of the tundish molten steel is related to the product crack defect index.
Controlling the T.O (total oxygen) content in molten steel is one of the key technologies for smelting low-carbon and ultra-low-carbon aluminum killed steel.
At present, smelting process technologies adopted by low-carbon and ultra-low-carbon aluminum and killed steel, such as IF steel, O5 plates, DR materials and the like are as follows:
molten iron pretreatment, converter smelting and vacuum degassing
(1) Pretreating molten iron: the main purpose is desulfurization; or in the pretreatment stage of molten iron, desiliconization and dephosphorization are carried out in addition to desulfurization, namely the so-called 'triple-elimination' treatment;
(2) converting in a converter: the most main purposes are decarburization and temperature rise; at present, in the production of low-carbon, ultra-low-carbon and low-T.O (total oxygen) content aluminum killed steel, the converter blowing does not carry out the carbon-pulling operation, and no alloy is added in the tapping process to carry out steel ladle alloying, but a lime or lime-based composite slagging agent is added in the tapping process, and a slag reducing agent containing metallic aluminum is spread on the surface of steel ladle slag to carry out the modification treatment on the steel ladle slag after the tapping is finished. Ensuring that there is a certain amount of free or active F O in molten steel to promote further decarbonization of molten steel in vacuum degassing state; the slag reducing agent containing metallic aluminum spread on the slag surface of the steel ladle can further reduce the contents of low-valence oxides such as FeO (FeO), MnO (MnO) and the like in the slag and reduce the oxidability of the slag;
the relationship between (FeO) + (MnO) in the ladle slag and T.O (total oxygen) of the ladle molten steel after RH treatment is shown in FIG. 5, in which T.O (total oxygen) increases as the amount of (FeO) + (MnO) increases. In general, the converter slag contains 17-22% (T.Fe) (total iron) and 3.00-5.00% (MnO). Therefore, it is currently widely usedThe widely adopted process is that lime or lime-based compound (the adding amount is 2.5-4.5kg/t) is added in the tapping process, reducing slag containing metallic aluminum (the adding amount is 1.30-3.00kg/t) is spread on the surface of ladle slag after tapping is finished, and slag modification is carried out to reduce (FeO) + (FeO) in the ladle slagMnO). Due to CaO and Al2O3The melting points are all above 2000 ℃, and only a part of lime in the lime or lime-based compound added in the tapping process is dissolved in slag- And a part of unmelted lime exists in the form of (CaO), so that the ladle slag is quickly solidified, and the fluidity, mass transfer and adsorption and inclusion capacities of the formed slag are greatly reduced; the reducing slag containing metallic aluminum spread on the slag surface of the ladle after tapping is finished, and the solidified ladle slag with poor flow and mass transfer can not be uniformly distributed on the slag surface, so that the modification effect of the slag reducer is greatly reduced. The problems that arise from this are: the temperature of the molten steel is greatly reduced; active in molten steel and slag (Al)2O3) The inclusion is greatly increased; the fluidity, mass transfer and impurity adsorption capacity of the slag are greatly reduced.
(3) Vacuum degassing, OB (oxygen blowing), is mainly used for further decarburization and for adjusting the alloy composition and temperature.
Under vacuum condition, PCO(partial pressure of carbon monoxide) is more favorable for reduction of [ C]+[O]The reaction is carried out by utilizing F [ O]in molten steel]And OB blowing oxygen to further decarburize to the target required ultra-low carbon level. After the decarburization is finished, aluminum deoxidation and molten steel alloying are carried out, and the components and the temperature are uniform.
Disclosure of Invention
The invention aims to provide a method for producing low-oxygen steel, which can reduce the T.O (total oxygen) content in tundish molten steel and reduce the production cost.
The principle of the invention is as follows:
T.O (total oxygen) in steel includes F [ O](free oxygen-oxygen dissolved in molten steel) and complex oxygen (oxide), and aluminum is used for deoxidation:
lgK＝lg([Al]2[O]3)＝-62780/T+20.54
at 1873K (1600 ℃ C.), K is 1.05X 10-13. Molten steel [ Al]]0.03-0.06% of F [ O]in steel]Only 3-5ppm, and therefore the t.o (total oxygen) mainly comes from very fine oxide inclusions in the steel. Reduce the amount of oxide inclusions and promote oxygenThe aggregation, floating, adsorption and removal of the oxide inclusions are the key points for reducing the T.O (total oxygen) in the steel.
The ultra-low carbon (C<40ppm) smelting process principle is shown in figure 2. The converter is blown to a low carbon level (0.03-0.06%) and tapped, and the non-deoxidized molten steel is subjected to vacuum treatment (such as RH main treatment).
Under vacuum conditions:
due to PCOSignificantly lower, e.g. PCOFrom 0.1MPa (1atm) to 0.13 Kpa. TrueThe air promotes the decarburization and deoxidation reaction, and the initial [% C of molten steel]Approximately 0.03-0.04, corresponding to initial [% O]About 0.06, and the final carbon can be reduced to less than 30ppm by vacuum treatment (such as RH main treatment) for decarburization and deoxidation.
From the thermodynamic perspective, [ C]at different vacuum degrees is shown in FIG. 3]-[O]Equilibrium curve. Under a vacuum of 0.13Kpa (P)CO132Pa), the equilibrium oxygen level at 6ppm of decarburization is only 30 to 50ppm higher; but from a kinetic standpoint (as shown in FIG. 4), when free oxygen F [ O]]If the carbon content is less than 300ppm, the decarburization rate is remarkably affected by [ O]]The transmission control of (1). Therefore, when the decarburization is carried out in actual production to a target of 20ppm or less, the free oxygen F [ O]of the molten steel is ensured]Suitably>200ppm, but free oxygen F [ O]]Too high increases the consumption of deoxidized aluminum and the T.O (total oxygen) content of molten steel.
The main purpose of vacuum refining is to further decarbonize and adjust the components and temperature.
Decarburization under vacuum conditions:
Kcexpression of the decarburization Rate, min-1
t-decarburization time, min
w-circulation flow of molten steel, t/s
W-weight of molten Steel, T
Ak-coefficient of capacity, t/s
The diameter of the dip pipe is increased, the blowing rate is increased, the circulating flow of the molten steel is increased, and the vacuum degree is increased, so that the decarburization rate can be effectively increased.
FIG. 7 shows the effect of oxygen level on decarburization at a critical oxygen content [ O]]Above 200ppm, at two different oxygen levels, Kc2(apparent decarburization rate constant) was hardly different significantly.
Ladle molten steel F [ O]before vacuum refining decarburization treatment]450-750ppm，[C]200-500ppm，OBOxygen introduction amount is less than 100NM3；
In theory, it is possible to say that, reaction, every time 1ppm of [ C]is removed]About 1.33(16/12) ppm [ O]is required]；
FIG. 9 shows the oxygen flux and free oxygen F [ O]for a 300 ton ladle OB]Relation between, basic estimation of 1NM3(O2)→2.50-3.00ppm(F[O]) (ii) a Since the converter tapping ladle slag is not deoxidized and modified, a part of oxygen in the ladle slag participates in the decarburization reaction under vacuum.
After the decarbonization is finished, adding deoxidized aluminium and molten steel F [ O]before finished aluminium]Less than 350ppm, can reduce Al consumption and Al (Al) under the condition of ensuring production rhythm2O3) The total amount of aluminum (kg) and F [ O]produced as shown in FIG. 8](ppm) relationship between;
the technical solution of the invention is as follows: the production method of low-oxygen steel comprises the following steps,
a) the molten iron is pretreated, and the main purpose is desulfurization;
b) converter smelting, mainly aiming at decarburization and temperature rise; carbon blowing stop]E0.03-0.06% of free oxygen F [ O]and stopping blowing]E1100PPM at 700 + blowing temperature TEMore than or equal to 1660 ℃; without deoxidation and alloying during tappingTo ensure the carbon ([ C]) of the ladle molten steel before vacuum treatment]LD) 0.02-0.06% of steel ladle molten steel free oxygen (F [ O])]LD)450 PPM and 750 PPM; temperature T of molten steelLDSo as to meet the temperature required by casting without OB oxygen blowing, aluminum adding and temperature rising in vacuum treatment;
c) vacuum degassing refining, which is mainly used for further decarburization and adjusting components and temperature; the temperature of the molten steel in the ladle before the vacuum refining decarburization treatment is 1590 and 1620 ℃, and the temperature rise of adding OB oxygen and aluminum is reduced as much as possible;
d) tapping, adding a slag modifier into a steel ladle, wherein the adding amount is 4.00-7.00 kg/t;
after tapping begins, adding a slag modifier into the steel flow, wherein the adding amount is 4.00-7.00 kg/t; the melting point of the calcium aluminate slag system is 1400 ℃ (C)12A7) Under the condition that the temperature of tapping and ladle molten steel is above 1600 ℃, the slag can be melted rapidly and floats to the molten steel surface. Because the new slag modifier is pre-molten and does not contain metallic aluminum, the new slag modifier has the advantages of small temperature drop of molten steel, no influence on the free oxygen content of steel ladle molten steel and no large amount of activity (Al)2O3) Generation of (Al) in the steel2O3) Oxide inclusions have stronger adsorption capacity;
e) and (3) casting, namely spreading 0.15-0.35kg/t of slag modifier containing metallic aluminum on the slag surface of molten steel in a steel ladle before casting, and further reducing the content of (FeO) + (MnO) in slag.
Wherein the slag modifier in the step d is pre-dissolved calcium aluminate, and comprises the following components in percentage by mass:CaO 60-40％，Al2O340-60% as shown in figure 6.
And e, the content of the metal aluminum in the slag modifier in the step e is 45-50%.
The invention has the advantages of
(1) The T.O (total oxygen) content of the molten steel in the tundish is reduced by 18 percent;
(2) the RH-OB oxygen quantity is reduced by 20 percent;
(3) the consumption of the deoxidized aluminum after the refining and decarburization treatment is reduced by 11 percent;
(4) the cost of modifying the converter ladle slag is reduced by more than 23 percent.
Drawings
FIG. 1 is a graph showing the relationship between T.O (total oxygen) of molten steel in a tundish and an index of crack defects generated in a product.
FIG. 2 shows changes in [ C]and [ O]in vacuum decarburization.
FIG. 3 is a graph showing [ C]- [ O]equilibrium curves at different vacuum degrees.
FIG. 4 is a schematic representation of the effect of oxygen content on decarburization.
FIG. 5 is a graph showing the relationship between (FeO) + (MnO) in the ladle slag and T.O (total oxygen) of the ladle molten steel after RH treatment.
FIG. 6 shows CaO-Al2O3Two-element slag system phase diagram.
FIG. 7 shows the effect of oxygen sites on decarburization.
FIG. 8 shows the relationship between the total amount of aluminum (kg) charged and free oxygen F [ O](ppm).
FIG. 9 shows the relationship between OB oxygen flux and F [ O].
Detailed Description
The embodiment is shown in the table 1, the low-oxygen steel production method ofthe invention comprises the steps of firstly pretreating molten iron and desulfurizing; then smelting in a converter, stopping blowing carbon]E0.03-0.06% of free oxygen F [ O]and stopping blowing]E1100ppm at 700-EMore than or equal to 1660 ℃; then vacuum degassing refining is carried out to further decarbonize and adjust the components and the temperature, and the temperature of the molten steel in the ladle before the vacuum refining decarbonization treatment is 1590-1620 ℃; after the decarbonization is finished, adding deoxidized aluminium and molten steel free oxygen F [ O]before finished aluminium is added]Less than 350 ppm; tapping, adding a slag modifier into a steel ladle, wherein the adding amount is 4.00-7.00 kg/t; before casting, 0.15-0.35kg/t of slag modifier containing metallic aluminum (45-50%) is spread on the slag surface of molten steel in a ladle, so that the content of FeO and MnO in slag is further reduced.
Table 2 shows examples of variations in the composition of ladle slag, in general, converter blowing-out slag T.Fe (total)Iron) 17-22 percent and MnO3.00-5.00 percent, has very high oxidability, and reduces the converter slag with high oxidability as much as possible by adopting various slag stopping methodsSlag is discharged to the outside of the steel ladle in the tapping process, a slag modifier is added in the tapping process to modify the steel ladle slag, the content of oxides such as T.Fe (total iron), MnO and the like in the steel ladle slag is reduced, and paired Al is generated2O3Calcium aluminate with low melting point and strong adsorption capacity of oxide inclusions; after the vacuum refining decarburization is finished, deoxidized aluminum and finished product aluminum are added, before casting, modified slag containing 45-50% of metallic aluminum is spread on the slag surface of the molten steel in a ladle, the content of (FeO) + (MnO) in the slag is furtherreduced, the oxidability of the slag after RH treatment is reduced, and Al generated by aluminum deoxidation is adsorbed2O3Inclusion (Al in slag after RH treatment)2O3The content is obviously increased).
TABLE 1
| Fruit of Chinese wolfberry Applying (a) to Example (b) | Molten iron Treatment of Desulfurization of Rear end [S] ppm | Stopping blowing of converter | Go out Steel In Adding Improvement of Quality of food Agent for treating cancer kg/t | RH treatment | Intermediate (II) Steel ladle Water (W) T.O ppm | ||||||
| [C] ppm | T (℃) | F[O] ppm | Decarburization of carbon End up [C] ppm | Oxygen blowing Amount of oxygen NM3/ Furnace with a heat exchanger | Before adding aluminium F[O] ppm | Amount of added aluminum kg/furnace | Treatment of
End up
Rear aluminium
Slag adding
Input amount
kg/ | ||||
| 1 | 30 | 462 | 1677 | 963 | 5.2 | ＜20 | 47 | 318 | 277 | 0.27 | 22 |
| 2 | 35 | 471 | 1683 | 1100 | 5.1 | ＜20 | 0 | 324 | 277 | 0.27 | 18 |
Table 2: ladle slag composition
| Slag sample | Examples | T-Fe | CaO | SiO2 | Al2O3 | MgO | MnO |
|
Converter blowing-stopping | 1 | 20.00 | 45.30 | 9.20 | 1.49 | 9.11 | 3.80 |
| 2 | 19.00 | 45.50 | 9.70 | 1.39 | 8.40 | 3.60 | |
|
Slag of steel ladle under | 1 | 13.60 | 44.30 | 8.10 | 17.98 | 7.00 | 3.40 |
| 2 | 13.40 | 38.70 | 7.90 | 24.61 | 7.20 | 3.40 | |
|
Slag after | 1 | 6.10 | 37.00 | 6.50 | 44.13 | 7.10 | 2.60 |
| 2 | 5.60 | 35.10 | 7.00 | 44.81 | 6.00 | 1.90 |
Claims (4)
1. The production method of low-oxygen steel comprises the following steps,
a) the pre-treatment of the molten iron,
b) converter smelting, carbon blowing stopping]E0.03-0.06% of free oxygen F [ O]and stopping blowing]E1100ppm at 700-E≥1660℃；
c) Vacuum degassing and refining, wherein the temperature of the molten steel in the steel ladle before the vacuum refining and decarburization treatment is 1590-;
d) tapping, adding a slag modifier into a steel ladle, wherein the adding amount is 4.00-7.00 kg/t;
e) and (3) casting, namely spreading 0.15-0.35kg/t of slag modifier containing metallic aluminum on the slag surface of molten steel in a steel ladle before casting, and further reducing the content of (FeO) + (MnO) in slag.
2. The method for producing low-oxygen steel as claimed in claim 1, wherein the modifier is pre-dissolved calcium aluminate, and the components (mass percent): CaO 60-40%, Al2O340-60％。
3. The method of claim 1, wherein the free oxygen F [ O]of the molten steel is less than 350ppm after the decarburization is completed and before the addition of the deoxidized aluminum and the finished aluminum.
4. The method for producing low oxygen steel according to claim 1, wherein the metallic aluminum content in the slag modifier of step e is 45-50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100173098A CN1298867C (en) | 2004-03-30 | 2004-03-30 | Suboxide steel production method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100173098A CN1298867C (en) | 2004-03-30 | 2004-03-30 | Suboxide steel production method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1676621A true CN1676621A (en) | 2005-10-05 |
| CN1298867C CN1298867C (en) | 2007-02-07 |
Family
ID=35049370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100173098A Expired - Lifetime CN1298867C (en) | 2004-03-30 | 2004-03-30 | Suboxide steel production method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1298867C (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101294946B (en) * | 2008-06-05 | 2011-06-15 | 武汉科技大学 | Model modeling and optimization method for mixed on-line estimating killing oxygen by adding aluminum |
| CN101736129B (en) * | 2010-01-05 | 2011-08-24 | 武汉钢铁(集团)公司 | Method for removing total oxygen in molten steel |
| CN101633974B (en) * | 2009-08-18 | 2012-04-04 | 武汉钢铁(集团)公司 | Smelting process of ultra low oxygen steel |
| CN102443679A (en) * | 2011-12-07 | 2012-05-09 | 鞍钢股份有限公司 | Production method of ultralow oxide inclusion steel |
| CN102952923A (en) * | 2012-11-27 | 2013-03-06 | 南京钢铁股份有限公司 | Process for smelting aluminum containing steel through calcium carbide deoxidation |
| CN102978328A (en) * | 2012-10-31 | 2013-03-20 | 高金菊 | Preparation method for composite slagging agent used for converter |
| CN102978329A (en) * | 2012-10-31 | 2013-03-20 | 高金菊 | Composite slagging agent for converter |
| CN108220533A (en) * | 2017-12-26 | 2018-06-29 | 首钢集团有限公司 | A kind of method for improving IF steel alloy recovery rates |
| CN109554605A (en) * | 2017-09-27 | 2019-04-02 | 宝山钢铁股份有限公司 | A kind of Control on Oxide Inclusions method of LD-RH technique production ultra-low-carbon steel |
| CN114657448A (en) * | 2021-12-28 | 2022-06-24 | 邢台钢铁有限责任公司 | Production method of aluminum killed steel |
| CN115323120A (en) * | 2022-08-08 | 2022-11-11 | 邢台钢铁有限责任公司 | Production method of controlled oxygen of semi-boiling ultra-low carbon steel RH furnace |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1323096C (en) * | 1988-10-07 | 1993-10-12 | Michael Lee Wash | Implicit mid roll interrupt protection code for camera using dedicated magnetic tracks on film |
| US5356456A (en) * | 1992-10-07 | 1994-10-18 | Kawasaki Steel Corporation | Method of degassing and decarburizing stainless molten steel |
| ATA121393A (en) * | 1993-06-21 | 1998-07-15 | Voest Alpine Ind Anlagen | CONVERTER AND METHOD FOR PRODUCING STEEL |
| JPH07173518A (en) * | 1993-12-20 | 1995-07-11 | Nippon Steel Corp | Melting method of extra-low carbon steel or low oxygen steel under the atmosphere |
| TW587943B (en) * | 1998-01-13 | 2004-05-21 | Kose Corp | Powder composition, a powder dispersion in oil and a cosmetic composition containing said powder composition and a powder dispersion in oil |
| KR100862030B1 (en) * | 2001-12-22 | 2008-10-07 | 주식회사 포스코 | Atmosphere corrosion resisting steel producting method in mini mill process |
| CN1189575C (en) * | 2003-07-04 | 2005-02-16 | 钢铁研究总院 | Converter steelmaking process |
-
2004
- 2004-03-30 CN CNB2004100173098A patent/CN1298867C/en not_active Expired - Lifetime
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101294946B (en) * | 2008-06-05 | 2011-06-15 | 武汉科技大学 | Model modeling and optimization method for mixed on-line estimating killing oxygen by adding aluminum |
| CN101633974B (en) * | 2009-08-18 | 2012-04-04 | 武汉钢铁(集团)公司 | Smelting process of ultra low oxygen steel |
| CN101736129B (en) * | 2010-01-05 | 2011-08-24 | 武汉钢铁(集团)公司 | Method for removing total oxygen in molten steel |
| CN102443679B (en) * | 2011-12-07 | 2016-03-30 | 鞍钢股份有限公司 | A kind of production method of ultralow oxide inclusion steel |
| CN102443679A (en) * | 2011-12-07 | 2012-05-09 | 鞍钢股份有限公司 | Production method of ultralow oxide inclusion steel |
| CN102978328A (en) * | 2012-10-31 | 2013-03-20 | 高金菊 | Preparation method for composite slagging agent used for converter |
| CN102978329A (en) * | 2012-10-31 | 2013-03-20 | 高金菊 | Composite slagging agent for converter |
| CN102978328B (en) * | 2012-10-31 | 2014-11-12 | 高金菊 | Preparation method for composite slagging agent used for converter |
| CN102978329B (en) * | 2012-10-31 | 2014-12-24 | 高金菊 | Composite slagging agent for converter |
| CN102952923A (en) * | 2012-11-27 | 2013-03-06 | 南京钢铁股份有限公司 | Process for smelting aluminum containing steel through calcium carbide deoxidation |
| CN109554605A (en) * | 2017-09-27 | 2019-04-02 | 宝山钢铁股份有限公司 | A kind of Control on Oxide Inclusions method of LD-RH technique production ultra-low-carbon steel |
| CN109554605B (en) * | 2017-09-27 | 2021-06-15 | 宝山钢铁股份有限公司 | Oxide inclusion control method for producing ultra-low carbon steel by LD-RH process |
| CN108220533A (en) * | 2017-12-26 | 2018-06-29 | 首钢集团有限公司 | A kind of method for improving IF steel alloy recovery rates |
| CN108220533B (en) * | 2017-12-26 | 2020-03-27 | 首钢集团有限公司 | Method for improving yield of IF steel alloy |
| CN114657448A (en) * | 2021-12-28 | 2022-06-24 | 邢台钢铁有限责任公司 | Production method of aluminum killed steel |
| CN115323120A (en) * | 2022-08-08 | 2022-11-11 | 邢台钢铁有限责任公司 | Production method of controlled oxygen of semi-boiling ultra-low carbon steel RH furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1298867C (en) | 2007-02-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107841597B (en) | Method for producing silicon-deoxidized low-sulfur high-carbon steel by adopting LF refining double-slag method | |
| CN108823346B (en) | method for producing secondary flaw detection Q345R medium steel plate with low cost | |
| CN112126737B (en) | Production method of low-sulfur alloy molten steel | |
| CN107354269A (en) | The method that RH complex deoxidizations produce ultra-low-carbon steel | |
| CN104120352A (en) | 34CrMo4 gas cylinder steel and production method thereof | |
| CN1676621A (en) | Suboxide steel production method | |
| CN103740883A (en) | Deoxidation method of plain carbon steel | |
| CN102586547A (en) | Production method for low-cost clean steel | |
| CN114107593A (en) | Production method of 60 kg-grade welding wire steel | |
| CN110004271B (en) | Production process for controlling B-type inclusions in pipeline steel | |
| CN109439842B (en) | Production method of AISI1006 steel for motor claw machine | |
| CN102965469A (en) | Smelting control method by utilizing inclusion of reoxides in steel | |
| CN101054613A (en) | Fluxing agent for prerefining molten steel during tapping process | |
| CN109852872A (en) | A kind of automobile driving system cage steel and its production method | |
| CN113913580B (en) | Production method of ultralow-carbon low-aluminum structural molten steel | |
| JP3460595B2 (en) | Melting method for extremely low sulfur steel | |
| JP2013124385A (en) | Method for making manganese-containing low-carbon steel | |
| CN115612912B (en) | Refining method for controlling sulfur of structural steel for aluminum-containing shaft | |
| CN115404309B (en) | Molten steel deoxidizing method | |
| CN110484693B (en) | Low-cost RH decarburization dephosphorization method | |
| CN115323115B (en) | Method for improving cleanliness of filter steel | |
| CN115261564B (en) | Pure iron as non-aluminum deoxidizing material for amorphous soft magnetic thin belt and preparation method thereof | |
| CN111910116B (en) | Molybdenum-containing stainless steel smelting method for inhibiting molybdenum oxide volatilization and sputtering | |
| JP7319548B2 (en) | Molten steel desulfurization method | |
| CN103320574A (en) | Molten iron dephosphorizing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20070207 |