CN115558738A - Method for smelting high-chromium molten steel by combined blown converter under low oxygen potential - Google Patents
Method for smelting high-chromium molten steel by combined blown converter under low oxygen potential Download PDFInfo
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- 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
- C21C5/35—Blowing from above and through the bath
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- 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
- C21C7/0006—Adding metallic additives
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- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
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- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention relates to a method for smelting high-chromium molten steel by a combined blown converter under low oxygen potential, which comprises the following steps: adding molten iron with the temperature of more than 1350 ℃ and the silicon content of 0.3-0.6 wt.% into a combined blown converter, and then adding waste steel with low sulfur content meeting the requirement; the low sulfur content means that the sulfur content is less than or equal to 40ppm; carrying out decarburization and dephosphorization treatment by blowing oxygen; when the molten steel does not meet the first process test requirement, continuing to blow oxygen, adjusting the molten steel to meet the requirement and blowing till the molten steel meets the first process test requirement; blowing mixed gas of carbon dioxide and argon, and adding ferrochrome; and after the test, if the temperature is lower than the temperature required by the steel grade, adding a temperature raising agent, continuously blowing the mixed gas of carbon dioxide and argon, stopping smelting when the test requirement of the second process is met, and performing an end point test.
Description
Technical Field
The invention relates to the technical field of converter steelmaking process and stainless steel smelting, in particular to a method for smelting high-chromium molten steel by a top-bottom combined blown converter.
Background
The smelting of chromium-containing molten steel is the key and difficult point of stainless steel smelting, and the KOMBS production process and the AOD converter process which are widely adopted in the stainless steel production not only need larger equipment investment, but also have higher requirements on the carbon content of ferrochrome alloy required in the smelting process. But the converter smelting process is difficult to avoid serious oxidation of the metal chromium caused by overhigh oxygen potential of the converter. Patent CN200710139588.9 discloses a method for smelting stainless steel by a top-bottom combined blown converter, which achieves the purpose of smelting stainless steel by adding coke and adjusting the ratio of argon, nitrogen and oxygen to control the temperature of the converter. However, each step in the method has a limited temperature, the reaction in the converter is complex, and the temperature is difficult to control accurately. Patent CN200610044067.0 discloses a top-bottom combined blown converter smelting method of austenitic stainless steel, which adopts a duplex method to smelt low-carbon molten steel, but the alloying process is not completed in the converter process, which causes great burden to refining. Patent CN201010577633.0 discloses a method for smelting stainless steel by a top-bottom combined blown converter, which mainly adopts silicon carbide to reduce chromium oxide in slag. Therefore, a converter smelting method for controllable heat preservation, decarburization and chromium protection is still needed.
Disclosure of Invention
The invention aims to solve the defects of difficult accurate control of temperature, low yield of metallic chromium, complex operation process, heavy refining burden and the like in the process of smelting stainless steel by a top-bottom combined blown converter,
the invention provides the technical scheme that: a method for smelting high-chromium molten steel by a combined blown converter under low oxygen potential comprises the following steps:
the method comprises the following steps: a charging system, namely adding molten iron with the temperature requirement of more than 1350 ℃ and the silicon content of 0.3-0.6 wt.% into a combined blown converter, and then adding waste steel with low sulfur content meeting the requirement; the low sulfur content means that the sulfur content is less than or equal to 40ppm;
step two: an oxygen supply system adopts working oxygen pressure and oxygen flow under normal conditions, and decarburization and dephosphorization are carried out by oxygen blowing to enter the molten steel blowing process;
step three: when the oxygen accumulation amount in the combined blown converter is 5000-6000 m 3 When the molten steel does not meet the first process test requirement, continuously blowing oxygen, adjusting the molten steel to meet the requirement and blowing till the molten steel meets the first process test requirement;
step four: when the molten steel meets the first process test requirement, stopping supplying oxygen, starting blowing the mixed gas of carbon dioxide and argon, and adding ferrochrome;
step five: when the total amount of carbon dioxide in the combined blown converter reaches 500m 3 ～600m 3 Then, carrying out a second process test, and after the test, if the temperature is lower than the temperature required by the steel grade, adding a temperature raising agent, and continuously blowing the mixed gas of carbon dioxide and argon until the second process test requirement is met;
step six: and stopping smelting when the requirement of the second process test is met, and performing an end point test, wherein molten steel containing high chromium is obtained when the molten steel meets the requirement of the end point test.
Further: the first process test requirement comprises: the temperature requirements are as follows: according to the tapping temperature of different steel grades, the temperature is between 20 and 30 ℃, and the carbon content is 0.6 to 1 percent.
Further, the method comprises the following steps: the condition of adding the ferrochrome alloy is as follows: when the flow rate of the carbon dioxide accounts for 75-85% of the volume ratio of the mixed gas.
Further: the temperature raising agent adopts aluminum, and the adding amount of the aluminum is 100-300 kg.
Further: when the total amount of the carbon dioxide in the combined blown converter reaches 500m 3-600 m3, carrying out a second process test, and after the test, judging that the smelting is stopped by continuously blowing the carbon dioxide as follows: when the carbon dioxide accounts for 7075-8085%, the decarburization rate is calculated according to 5-10 ppm/s, and the cooling rate is calculated according to 2-4 ℃/min. .
Further, the smelting stopping conditions are as follows: the end point test temperature meets the requirements of steel grades, and the end point test carbon and oxygen content meets the requirements of steel grades.
Further: the end point test includes a temperature test and an oxygen content test,
when the temperature of the molten steel is lower than the temperature test, performing complementary blowing according to the oxygen supply system in the second step to increase the temperature of the molten steel;
when the oxygen content is lower than the oxygen content test requirement, performing complementary blowing according to the oxygen supply system in the second step to improve the oxygen content of the molten steel;
when the oxygen content is higher than the oxygen content test requirement, a deoxidizer is supplemented into the molten steel in the tapping process. Further: the deoxidizer adopts aluminum, and the adding amount of the aluminum is 50-200 kg.
According to the method for smelting high-chromium molten steel by the top-bottom combined blown converter, provided by the invention, the stainless steel smelting by the converter is realized by controlling the oxygen potential of the converter, the production efficiency is improved, and the production cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of the method.
Detailed Description
It should be noted that, in the case of conflict, the embodiments and features of the embodiments of the present invention may be combined with each other, and the present invention will be described in detail with reference to the accompanying drawings and embodiments.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
For ease of description, spatially relative terms such as "over … …", "over … …", "over … …", "over", etc. may be used herein to describe the spatial positional relationship of one device or feature to another device or feature as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
FIG. 1 is a flow chart of the present method;
a method for smelting high-chromium molten steel in a combined blown converter at low oxygen potential comprises the following steps of:
the method comprises the following steps: a charging system, wherein molten iron with the temperature requirement of more than 1350 ℃ and the silicon content of 0.3 to 0.6wt.% is added into a combined blown converter, and then the waste steel with low sulfur content meeting the requirement is added; the low sulfur content means that the sulfur content is less than or equal to 40ppm;
step two: the oxygen supply system adopts the working oxygen pressure (0.8-1.2 MPa) and the oxygen flow (30000-45000 m) under the normal condition 3 The process comprises the steps of/h), carrying out decarburization and dephosphorization treatment by oxygen blowing, and entering the molten steel blowing process;
step three: when the oxygen accumulation amount in the combined blown converter is 5000-6000 m 3 And then, carrying out a first process test of molten steel, wherein the first process test requirement comprises the following steps: the temperature requirements are as follows: according to the tapping temperature of different steel grades, the temperature is between 20 and 30 ℃, the carbon content is 0.6 to 1 percent,
when the molten steel does not meet the first process test requirement, continuing to blow oxygen, adjusting the molten steel to meet the requirement (the temperature is more than 1350 ℃ and the silicon content is 0.3-0.6 wt.%) and blowing until the molten steel meets the first process test requirement;
step four: when the molten steel meets the first process test requirement, stopping oxygen supply, starting blowing the mixed gas of carbon dioxide and argon, and adding ferrochrome when the flow of the carbon dioxide accounts for 75-85% of the volume ratio of the mixed gas; during the blowing of the mixed gas of carbon dioxide and argon, the endothermic reaction of carbon dioxide and the exothermic reaction of carbon monoxide are basically kept in balance, so the heat balance in the combined blown converter is basically kept unchanged; so that there is no significant heat loss in the converter system.
Step five: when the total amount of carbon dioxide in the combined blown converter reaches 500m 3 ～600m 3 Then, carrying out a second process test, wherein the second process test meets the self-determined temperature requirement of a steel plant, and after the second test, if the temperature is lower than the temperature required by the steel grade, adding a temperature raising agent, and continuously blowing the mixed gas of carbon dioxide and argon until the second process test requirement is met;
step six: stopping smelting when the requirement of the second process test is met, carrying out the end point test,
when the total amount of the carbon dioxide in the combined blown converter reaches 500m 3-600 m3, carrying out a second process test, and after the test, judging that the smelting is stopped by continuously blowing the carbon dioxide as follows: when the carbon dioxide accounts for 7075-8085%, the decarburization rate is calculated according to 5-10 ppm/s, and the cooling rate is calculated according to 2-4 ℃/min.
The smelting stopping conditions are as follows: the end point test temperature meets the requirements of steel grades, and the end point test carbon and oxygen content meets the requirements of steel grades.
The end point test includes a temperature test and an oxygen content test,
when the temperature of the molten steel is lower than the requirement of the test temperature, the complementary blowing is carried out according to the oxygen supply system in the second step, and the temperature of the molten steel is increased;
when the oxygen content is lower than the oxygen content test requirement, performing complementary blowing according to the oxygen supply system in the second step to improve the oxygen content of the molten steel;
when the oxygen content is higher than the oxygen content test requirement, a deoxidizer is supplemented into the molten steel in the tapping process.
And when the molten steel meets the requirements of the end point test, the molten steel containing high chromium is obtained.
Furthermore, the temperature raising agent is aluminum, and can be an aluminum wire section, and the adding amount of the aluminum is 100-300 kg;
further: the deoxidizer adopts aluminum, and the addition amount of the aluminum is 50-200 kg.
The first implementation example is as follows:
the method comprises the following steps: molten iron with the temperature of 1355 ℃ is added into the combined blown converter, the adding amount of the molten iron is 181t, the charging amount of scrap steel is 30t, and the molten iron comprises the following components:
step two: oxygen blowing is carried out according to oxygen supply system, and oxygen accumulation in the process is 5600m 3 And then, carrying out a first process test, wherein the process test result is as follows: the temperature is 1561 ℃, and the carbon content is 0.62 percent;
step three: if the test result of the first process meets the smelting requirement, continuing to execute the step four;
step four: the first process test result reaches the target requirement, oxygen supply is stopped, mixed gas of carbon dioxide and argon gas is blown, wherein the flow of the mixed gas of carbon dioxide accounts for 75-85%, and ferrochrome is added;
step five: when the total amount of carbon dioxide reaches 510m 3 Then, carrying out a second process test, wherein the test temperature is 1628 ℃, continuously blowing the mixed gas of carbon dioxide and argon, calculating the decarburization rate according to 5-10 ppm/s, calculating the cooling rate according to 2-4 ℃/min, and judging when to stop smelting according to the decarburization rate and the cooling rate;
step six: stopping smelting when the test target is reached, performing end point test, and performing blowing-in according to the oxygen supply system in the step four if the end point test temperature is lower;
step seven: according to the end point test, when the oxygen content is high, aluminum is supplemented into the molten steel tank in the tapping process. Example two was performed:
the method comprises the following steps: molten iron with the temperature of 1365 ℃ is added into the combined blown converter, the adding amount of the molten iron is 182t, the charging amount of scrap steel is 28.5t, and the molten iron comprises the following components:
step two: oxygen blowing is carried out according to oxygen supply system, and oxygen accumulation in the process is 5600m 3 And then, carrying out a first process test, wherein the process test result is as follows: the temperature was 1572 ℃ and the carbon content was 0.73%.
Step three: if the test result of the first process meets the smelting requirement, continuing to execute the step four;
step four: the test result of the first process reaches the target requirement, oxygen supply is stopped, the mixed gas of carbon dioxide and argon gas is blown, wherein the flow of the mixed gas of carbon dioxide accounts for 75-85%, and ferrochrome is added.
Step five: when the total amount of carbon dioxide reaches 534m 3 And then, carrying out a second process test, wherein the test temperature is 1619 ℃, continuously blowing the mixed gas of carbon dioxide and argon, and calculating the decarburization rate according to 5-10 ppm/s and the cooling rate according to 2-4 ℃/min.
Step six: stopping smelting when the test target is reached, performing end point test, and performing blowing-in according to the oxygen supply system in the step four if the end point test temperature is lower;
step seven: when the oxygen content is high in the end point test, aluminum is supplemented into the molten steel tank in the tapping process.
Example three was performed:
the method comprises the following steps: the temperature of the molten iron is 1363 ℃, the adding amount of the molten iron is 177t, the charging amount of the scrap steel is 31t, and the components of the molten iron are as follows:
step two: blowing oxygen according to oxygen supply system with oxygen accumulation of 5600m 3 And then, carrying out a first process test, wherein the process test result is as follows: the temperature is 1583 ℃, and the carbon content is 0.66%.
Step three: if the test result of the first process meets the smelting requirement, the step four is continuously executed
Step four: the test result of the first process meets the target requirement, oxygen supply is stopped, mixed gas of carbon dioxide and argon is blown, wherein the flow of the mixed gas of the carbon dioxide accounts for 75-85%, and ferrochrome alloy is added.
Step five: when the total amount of carbon dioxide reaches 526m 3 And then, carrying out a second process test at 1621 ℃, continuously blowing the mixed gas of carbon dioxide and argon, wherein the decarburization rate is calculated according to 5-10 ppm/s, and the cooling rate is calculated according to 2-4 ℃/min.
Step six: stopping smelting when the calculated end point target is reached, carrying out end point test, and if the end point test temperature is lower, carrying out blowing-in according to the four-step oxygen supply system
Step seven: when the oxygen content is high in the end point test, aluminum is supplemented into the molten steel tank in the tapping process.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A method for smelting high-chromium molten steel by a combined blown converter under low oxygen potential is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: a charging system, namely adding molten iron with the temperature requirement of more than 1350 ℃ and the silicon content of 0.3-0.6 wt.% into a combined blown converter, and then adding waste steel with low sulfur content meeting the requirement; the low sulfur content means that the sulfur content is less than or equal to 40ppm;
step two: an oxygen supply system adopts working oxygen pressure and oxygen flow under normal conditions, and decarburization and dephosphorization are carried out by oxygen blowing to enter the molten steel blowing process;
step three: when the oxygen accumulation amount in the combined blown converter is 5000-6000 m 3 When the molten steel does not meet the first process test requirement, continuously blowing oxygen, adjusting the molten steel to meet the requirement and blowing till the molten steel meets the first process test requirement;
step four: when the molten steel meets the first process test requirement, stopping supplying oxygen, starting blowing the mixed gas of carbon dioxide and argon, and adding ferrochrome;
step five: when the total amount of carbon dioxide in the combined blown converter reaches 500m 3 ～600m 3 Then, carrying out a second process test, and after the test, if the temperature is lower than the temperature required by the steel grade, adding a temperature raising agent, and continuously blowing the mixed gas of carbon dioxide and argon until the second process test requirement is met;
step six: and stopping smelting when the requirement of the second process test is met, and performing an end point test, wherein molten steel containing high chromium is obtained when the molten steel meets the requirement of the end point test.
2. The method for smelting high-chromium molten steel at low oxygen potential of the combined blown converter according to claim 1, which is characterized by comprising the following steps: the first process test requirement comprises: the temperature requirements are as follows: according to the tapping temperature of +20 ℃ to 30 ℃, the carbon content is 0.6 percent to 1 percent.
3. The method for smelting high-chromium molten steel at low oxygen potential of the combined blown converter according to claim 1, which is characterized by comprising the following steps: the condition of adding the ferrochrome alloy is as follows: when the flow rate of the carbon dioxide accounts for 75-85% of the volume ratio of the mixed gas.
4. The method for smelting high-chromium molten steel at low oxygen potential of the combined blown converter according to claim 1, which is characterized by comprising the following steps: the temperature raising agent adopts aluminum, and the adding amount of the aluminum is 100-300 kg.
5. The method for smelting high-chromium molten steel at low oxygen potential of the combined blown converter according to claim 1, which is characterized by comprising the following steps: the total amount of carbon dioxide in the combined blown converter reaches 500m 3 ～600m 3 And then, carrying out a second process test, and continuously blowing carbon dioxide after the test: when the carbon dioxide accounts for 75-85%, the decarburization rate is calculated according to 5-10 ppm/s, and the cooling rate is calculated according to 2-4 ℃/min.
6. The method for smelting high-chromium molten steel at low oxygen potential of the combined blown converter according to claim 1, which is characterized by comprising the following steps: the smelting stopping conditions are as follows: the end point test temperature meets the requirements of steel grades, and the end point test carbon and oxygen content meets the requirements of steel grades.
7. The method for smelting high-chromium molten steel at low oxygen potential of the combined blown converter according to claim 1, which is characterized by comprising the following steps: the end point test includes a temperature test and an oxygen content test,
when the temperature of the molten steel is lower than the temperature test, performing complementary blowing according to the oxygen supply system in the second step to increase the temperature of the molten steel;
when the oxygen content is lower than the oxygen content test requirement, performing complementary blowing according to the oxygen supply system in the second step to improve the oxygen content of the molten steel;
when the oxygen content is higher than the oxygen content test requirement, a deoxidizer is supplemented into the molten steel in the tapping process.
8. The method for smelting high-chromium molten steel in a combined blowing converter under low oxygen potential according to claim 6 is characterized in that: the deoxidizer adopts aluminum, and the adding amount of the aluminum is 50-200 kg.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4272287A (en) * | 1979-05-29 | 1981-06-09 | Daido Tokushuko Kabushiki Kaisha | Process for refining molten steel containing chromium |
| CN101139679A (en) * | 2007-10-17 | 2008-03-12 | 山西太钢不锈钢股份有限公司 | Method for smelting stainless steel by top and bottom combined blown converter |
| JP2011084782A (en) * | 2009-10-16 | 2011-04-28 | Jfe Steel Corp | Method for producing high chromium steel |
| CN104694695A (en) * | 2015-03-16 | 2015-06-10 | 攀钢集团研究院有限公司 | Method for extracting vanadium and chromium through top-bottom combined blowing converter |
| CN109554515A (en) * | 2017-09-27 | 2019-04-02 | 鞍钢股份有限公司 | A kind of top-blown converter smelting stainless steel method |
-
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- 2022-11-01 CN CN202211358454.7A patent/CN115558738B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4272287A (en) * | 1979-05-29 | 1981-06-09 | Daido Tokushuko Kabushiki Kaisha | Process for refining molten steel containing chromium |
| CN101139679A (en) * | 2007-10-17 | 2008-03-12 | 山西太钢不锈钢股份有限公司 | Method for smelting stainless steel by top and bottom combined blown converter |
| JP2011084782A (en) * | 2009-10-16 | 2011-04-28 | Jfe Steel Corp | Method for producing high chromium steel |
| CN104694695A (en) * | 2015-03-16 | 2015-06-10 | 攀钢集团研究院有限公司 | Method for extracting vanadium and chromium through top-bottom combined blowing converter |
| CN109554515A (en) * | 2017-09-27 | 2019-04-02 | 鞍钢股份有限公司 | A kind of top-blown converter smelting stainless steel method |
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