CN115466824A - Processing method for AOD (automatic optic inspection) on-off ignition failure - Google Patents
Processing method for AOD (automatic optic inspection) on-off ignition failure 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
- 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
- C21C7/0685—Decarburising of stainless steel
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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 the technical field of metallurgy, in particular to a processing method for AOD blowing-on ignition failure, which is characterized by comprising the following steps: the stainless steel refining furnace needs deep decarburization, so the basic structure of top and bottom composite blowing causes ignition failure, and A) bottom gun blowing is on fire, and top gun blowing cannot be on fire; b) The bottom gun and the top gun can not be ignited; the invention provides a disposal method after the blowing-on ignition failure by fully utilizing the characteristics of AOD furnace top gun and side gun composite converting.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a processing method for AOD (argon oxygen decarburization) fire striking failure.
Background
During the production of stainless steel, the main decarbonization oxygen supply mode in the high carbon area is that the oxygen lance directly supplies oxygen to the molten pool, and the oxygen flow and the high temperature metal liquid are contacted to produce chemical reaction and produce a great deal of flame, commonly called as striking fire. With the development of stainless steel smelting process, the amount of alloy added into the AOD is increased to reduce the production cost, so that the difficult problem that the AOD is difficult to blow and ignite is increasingly highlighted. The reasons why the blow-on ignition is unsuccessful are mainly:
1) The slag content of the stainless steel mother liquid is large, and a large amount of cold slag enters the AOD furnace to agglomerate and float on the surface of the molten steel to prevent oxygen from reacting with the molten steel;
2) Adding a light alloy material too early to cause a large amount of alloy to float on the surface of the molten steel and form a cold steel layer to isolate the reaction of oxygen and the molten steel;
3) Slag charge is added too early, various physicochemical conditions such as low temperature and the like are poor, so that early-stage slag charge agglomerates float in molten steel, and are stirred and gathered along with a side lance to form large furnace charge agglomerates which cover the surface of the molten steel, and oxygen cannot effectively penetrate during blowing to cause ignition failure;
after the blowing and firing failure, if the treatment is improper, the top lance continuously blows oxygen, the temperature of mother liquor in the furnace is further reduced, molten steel in the furnace needs to be poured out for smelting again, otherwise, the head of the side lance is blocked by the cooled steel, the AOD furnace loses the side blowing function, and the smelting cannot be continued.
The methods for improving the open-blowing ignition in the prior published patents are provided aiming at the converter process, and have poor adaptability to the stainless steel process. In the publication patent CN 111139221B, a method for adding coke for combustion supporting is provided, which improves the success rate of ignition, but when the cost of adding the coke is increased, the coke is inevitably wrapped in the slag in a stainless steel dry slag smelting mode, so that the cost is wasted and the subsequent operation is difficult; CN 107164598A in the publication patent provides a method for supporting combustion by slag retention and coke, which has poor adaptability to stainless steel smelting; in the published patent CN 110527776A, the problem that AOD ignition fails can not be effectively solved because the method of pouring slag and adding molten iron and blowing the liquid level of the molten iron by using nitrogen at present is large in component loss in slag and low in mother liquor temperature for stainless steel smelting. The prior patents cannot timely treat the smelting of the stainless steel with large addition amount of alloy materials. Due to the characteristics of complex alloy elements and large alloy amount in stainless steel smelting, ignition failure cannot be simply solved by directly using measures such as molten iron adding or deslagging, and meanwhile, a series of problems such as gun blockage and the like are easily caused by improper treatment of a special structure of bottom blowing or side blowing of a stainless steel smelting furnace, so that the accident is enlarged; at present, a method for processing ignition failure in the production process of stainless steel needs to be provided, and efficient ignition is realized on the premise of avoiding secondary accidents; the loss of precious alloys in the stainless steel mother liquor and slag is also avoided.
Disclosure of Invention
The invention aims to solve the problems and provides a method for processing AOD (argon oxygen decarburization) fire opening failure.
The purpose of the invention is realized as follows: a processing method for AOD (argon oxygen decarburization) fire-striking failure is characterized by comprising the following steps: the stainless steel refining furnace needs deep decarburization, so the basic structure of top and bottom composite blowing causes ignition failure, and A) bottom gun blowing is on fire, and top gun blowing cannot be on fire; b) The bottom gun and the top gun cannot be ignited; for both cases, the specific treatment method is as follows: A. the bottom gun is on fire, the top gun is not on fire: (1) The converter is shaken to a temperature between-3 degrees and-5 degrees, the bottom lance continuously blows, the top lance gradually reduces the lance position, simultaneously reduces the gas flow, ensures the oxygen flow of the side lance, and increases the flow when the top lance cannot be fired for a long time; until the top lance is on fire; (2) If the continuous oxygen blowing amount reaches 3000Nm 3 When the top lance is not on fire, the top lance is proposed to be blown only by the bottom lance, and the total oxygen blowing of the bottom lance is 2000 Nm 3 (ii) a Observing the carbon-oxygen reaction condition and the flame temperature condition at the furnace mouth; (3) Shaking the furnace for three times between minus 20 degrees and 20 degrees after the bottom blowing is finished, and ensuring that no cold material is accumulated under a top lance; (4) Secondary top lance with oxygen flow rate of 250Nm 3 Min, gun position 170cm, bottom gun oxygen flow 130Nm 3 Min, nitrogen flow 35Nm 3 And/min, simultaneously observing flame at the furnace mouth to judge carbon-oxygen reaction, wherein when the flame is bright and the temperature rises, the successful ignition is realized.
B. Neither the bottom gun nor the top gun is on fire: 1) The furnace is shaken to a temperature between-3 degrees and-5 degrees, and the bottom gun continuously blows and carries out 130/30 Nm 3 In a/min large air supply mode, the top lance position is reduced to 1.7m, and the flow of the oxygen lance is increased to 290Nm 3 Min, ensuring the impact depth of a top lance and ensuring that slag on the surface of molten steel is fully blown; 2) Repeatedly lifting the lance position of the oxygen lance between 1.9 and 1.6m when the top lance still cannot normally fire after blowing for 2 minutes; 3) When the continuous oxygen blowing amount reaches 3000Nm 3 When the top and bottom guns are not on fire, executing a bottom gun manual converting mode, and using bottom blowing to start on fire; 4) Switching to manual mode, side gun performing oxygen 200Nm 3 Min, 15Nm of nitrogen or argon flow 3 Min; the furnace is required to be heated to-20 degrees, so that the side gun heating and stirring effects are good; counting that the bottom gun converting is more than 2000 Nm when the gas flow in the picture reaches the set value 3 After oxygen, according to the furnaceJudging whether bottom-blown oxygen is on fire or not according to the reaction condition of port flame and carbon and oxygen; 5) If the bottom blowing fire happens, the lower top gun is disposed according to the A-type disposal mode; 6) If the fire hole has no flame or the flame temperature is low, stopping converting, shaking the furnace shell for 2-3 times within the range of-20 to 60 degrees, shaking the furnace again to-20 degrees, using bottom blowing, and blowing oxygen again by a bottom gun to 1000 Nm 3 When the furnace is shaken to a temperature between-3 degrees and-5 degrees, the top lance is blown, and the flow rate of the top lance is 320Nm 3 And (4) min, 1.7m, rocking the furnace to measure the temperature, and switching to an automatic converting mode until normal smelting is carried out after fire.
(1) Gun position and flow adjustment is performed as follows: duration 1min, top gun: oxygen flow rate: 290Nm 3 Min, gun position: 280cm, bottom gun: oxygen flow rate: 95Nm 3 Min, nitrogen flow: 35Nm 3 Min; duration 1min, top gun: oxygen flow rate: 280Nm 3 Min, gun position: 270cm, bottom gun: oxygen flow rate: 95Nm 3 Min, nitrogen flow: 35Nm 3 Min; duration 1min, top lance: oxygen flow rate: 270Nm 3 Min, gun position: 200cm, bottom gun: oxygen flow rate: 95Nm 3 Min, nitrogen flow: 35Nm 3 Min; duration 3min, top gun: oxygen flow rate: 270Nm 3 Min, gun position: 170cm, bottom gun: oxygen flow rate: 95Nm 3 Min, nitrogen flow: 35Nm 3 Min; duration 3min, top lance: oxygen flow rate: 250Nm 3 Min, gun position: 170cm, bottom gun: oxygen flow rate: 130Nm 3 Min, nitrogen flow: 35Nm 3 /min。
The invention has the beneficial effects that: the invention provides a disposal method after the blowing-on ignition failure by fully utilizing the characteristics of AOD furnace top gun and side gun composite converting. The method does not adopt the traditional method of adding combustion improver and adding molten iron to raise the temperature of the premelted liquid, and reasonably avoids the loss of oxidized alloy in the slag caused by slag pouring, slag skimming and the like, and utilizes the characteristics of high AOD side-blowing stirring power, high oxygen supply strength and good stirring effect to restart the furnace in a way of exposing the surface of the premelted liquid molten steel in the furnace by blowing oxygen at the bottom for raising the temperature. For the failed fire striking cleaning of oxygen and premelt liquid isolation caused by large amount of slag in the furnace or large amount of light scrap steel, the success of secondary fire striking of the oxygen lance is ensured by using bottom blowing oxygen blowing heating and large-angle converting modes. The fire fighting failure accident is efficiently solved by fully combining the characteristics of the AOD furnace.
Detailed Description
The invention provides a method for efficiently dealing with ignition failure in a stainless steel smelting process; the method fully utilizes the unique structural characteristics of the AOD, utilizes the structure of AOD top-bottom composite blowing, well distributes gas for top-bottom blowing, utilizes the characteristic of large stirring strength of the AOD side gun, and deals with the failure of blowing and firing during stainless steel smelting on the premise of not deslagging and adding combustion improver.
The specific implementation steps are as follows:
because the stainless steel refining furnace needs deep decarburization, the ignition failure mode caused by the basic structure of top-bottom combined blowing is divided into two conditions, A) bottom gun blowing is on fire, and top gun blowing cannot be on fire; b) Neither the bottom gun nor the top gun can be on fire. For both cases, the specific treatment method is as follows:
A. the bottom gun is on fire, the top gun is not on fire:
1) The bottom lance continuously blows when the furnace is shaken to-3 degrees to-5 degrees, the top lance gradually reduces the lance position, simultaneously properly reduces the gas flow, ensures the oxygen flow of the side lance, and properly increases the flow when the top lance can not be ignited for a long time. And adjusting the gun position and the flow to execute the following table process until the top gun is fired.
2) If the continuous oxygen blowing amount reaches 3000Nm 3 When the top lance is not on fire, the top lance is proposed to blow only with the bottom lance, and the total oxygen blowing of the bottom lance is 2000 Nm 3 (ii) a Observing the carbon-oxygen reaction condition and the flame temperature condition at the furnace mouth;
3) Shaking the furnace for three times between minus 20 degrees and 20 degrees after the bottom blowing is finished, and ensuring that no cold material is accumulated under a top lance;
4) And (4) performing secondary top gun descending, performing last step flow of the upper table on the gas flow and the gun position, and simultaneously observing flame at the furnace mouth to judge carbon-oxygen reaction, wherein when the flame is bright and the temperature rises, the successful ignition is realized.
B. Neither the bottom gun nor the top gun is on fire:
1) The furnace is shaken to between-3 degrees and-5 degrees, and the bottom gun continuously blows and carries out 130/30 Nm 3 In a large air supply mode of/min, the top lance position is reduced to 1.7m, and the flow of the oxygen lance is increased to 290Nm 3 Min, ensuring the impact depth of a top lance and ensuring that slag on the surface of molten steel is fully blown;
2) Repeatedly lifting the lance position of the oxygen lance between 1.9 and 1.6m when the top lance still cannot normally fire after blowing for 2 minutes;
3) When the continuous oxygen blowing amount reaches 3000Nm 3 When the top and bottom guns are not on fire, executing a bottom gun manual converting mode, and using bottom blowing to start on fire;
4) Switching to manual mode, side gun performing oxygen 200Nm 3 Min, nitrogen (argon) flow 15Nm 3 Min; the furnace is required to be heated to-20 degrees, so that the side gun heating and stirring effects are good; counting that the bottom gun converting is more than 2000 Nm when the gas flow in the picture reaches the set value 3 After oxygen, judging whether bottom blowing oxygen is on fire or not according to the flame at the furnace mouth and the carbon-oxygen reaction condition;
5) If the bottom blowing fire is started, disposing the lower top gun according to a disposal mode A;
6) If the fire hole has no flame or the flame temperature is low, stopping converting, shaking the furnace shell for 2-3 times within the range of-20 to 60 degrees, shaking the furnace again to-20 degrees, using bottom blowing, and blowing oxygen again by a bottom gun to 1000 Nm 3 When the furnace is shaken to a temperature between-3 degrees and-5 degrees, the top lance is blown, and the flow rate of the top lance is 320Nm 3 And (4) min, 1.7m, rocking the furnace to measure the temperature, and switching to an automatic converting mode until normal smelting is carried out after fire.
Example 1
150 tons of AOD are used for producing SUS304 stainless steel by using a medium frequency furnace, AOD, LF and CC process, the steel adding amount is 107 tons, the furnace entering temperature is 1402 ℃, the carbon content in the furnace is 3.81 percent, and the silicon content is 2.75 percent; after steel mixing is finished, the furnace is shaken to-4 ℃ to start blowing, after a bottom gun is started to blow, weak flame appears at the furnace mouth, gas is obviously increased, and the bottom gun is normally fired; the furnace mouth has no obvious bright flame after the oxygen lance enters the body, and the oxygen lance blows the furnace slag in the furnace to form a large amount of blackThe failure of the ignition of the oxygen lance is caused by the over-thick slag layer in the furnace. After continuously converting for 2 minutes, the oxygen lance still does not successfully fire, the lance position is reduced to 2 meters, the lance moves up and down between 2 meters and 1.7 meters, and the flow of the oxygen lance is reduced to 250Nm 3 Min; side gun execution 130/35 Nm 3 Oxygen and nitrogen gas flow rate/min; after blowing for 2 minutes, bright flame appears at the furnace mouth, obvious strong silica-carbon-oxygen reaction appears, and the ignition is successful.
Example 2
150 tons of AOD are used for producing SUS304 stainless steel by using a medium frequency furnace, AOD, LF and CC process, the steel adding amount is 78 tons, and the furnace entering temperature is 1310 ℃, and is obviously lower than the normal level. During converting, no obvious fire reaction occurs in top-bottom blowing, the gas pressure of a side lance begins to rise, and the fire failure caused by low temperature is typically considered. Executing the treatment measures of failure of ignition, switching to a manual mode, rocking the furnace to-20 degrees, and allowing the oxygen flow of the side lance to be 200Nm 3 Min, nitrogen flow 15Nm 3 Oxygen blowing amount of 700Nm in three minutes of blowing/min 3 When the fire is over, the fire is ignited by the bottom gun. Blowing is carried out when the furnace is shaken to minus 4 degrees, and the flow of an oxygen lance is set to 250Nm 3 Min, gun position set to 1.7m, bottom gun flow oxygen set to 130Nm 3 Min, nitrogen setting 35Nm 3 And/min, after the furnace is normally blown by a gun for 40 seconds, bright flame appears at a furnace mouth, the reaction of silicon oxygen and carbon oxygen in the furnace tends to be normal, and the ignition is successful.
Example 3
150 tons of AOD are used for producing SUS304 stainless steel by using an intermediate frequency furnace, AOD, LF and CC process, the steel adding amount is 79t, the steel adding temperature is 1426 ℃, the steel adding carbon content is 3.98 percent, and the steel adding silicon content is 2.78 percent; the open blowing and the ignition are normal, the blowing is 800 Nm 3 After oxygen, a 55t cold charge tank is added, when the oxygen lance is put down again for blowing, the oxygen lance is ignited without reaction, the bottom blowing pressure rises, and the flow rate does not reach the set value. The case of ignition failure caused by excessive light materials in a typical cold material, floating cold material caused by adding the cold material and slag to prevent oxygen from contacting molten steel is shown. Depending on the furnace conditions, the side lance oxygen flow was increased to 130Nm 3 Min, blowing for 3min, then putting the lance for secondary ignition, and setting the flow of the oxygen lance to be 250Nm 3 Min, setting the lance position at 1.7m, blowing for 2 min, and no obvious fire reaction at the furnace mouthThe gun is lifted and shaken to-20 degrees, and the flow rate of the side gun is set to be 200Nm 3 Oxygen +15 Nm/min 3 Nitrogen gas blowing for 5 minutes, rocking the furnace to 65 degrees, when rocking the furnace to-5 degrees for the second time, putting a foreign gun to strike fire, and executing the top gun flow of 320Nm 3 Min, the position of the gun is executed for 1.7m, the fire is successfully struck after 1 minute, the position of the gun is recovered to 2.8 m, the oxygen flow is 280Nm 3 Min, the bottom gun flow is restored to 95Nm step by step 3 Oxygen +35 Nm/min 3 Min nitrogen. And switching to an automatic mode, and entering a normal converting mode.
The invention fully utilizes the structure of AOD top-bottom composite blowing, well distributes gas of top-bottom blowing, and utilizes the characteristics of large oxygen supply intensity and large stirring intensity of an AOD side gun to treat the failure of blowing and firing during stainless steel smelting on the premise of not deslagging and adding combustion improver.
The above description is only an embodiment of the present invention, but the structural features of the present invention are not limited thereto, and any changes or modifications within the scope of the present invention by those skilled in the art are covered by the present invention.
Claims (2)
1. A processing method for AOD (argon oxygen decarburization) fire-striking failure is characterized by comprising the following steps: the stainless steel refining furnace needs deep decarburization, so the basic structure of top and bottom composite blowing causes ignition failure, and A) bottom gun blowing is on fire, and top gun blowing cannot be on fire; b) The bottom gun and the top gun cannot be ignited; for both cases, the specific treatment method is as follows:
A. the bottom gun is on fire, the top gun is not on fire:
(1) The converter is shaken to a temperature between-3 degrees and-5 degrees, the bottom lance continuously blows, the top lance gradually reduces the lance position, simultaneously reduces the gas flow, ensures the oxygen flow of the side lance, and increases the flow when the top lance cannot be fired for a long time; until the top lance is on fire;
(2) If the continuous oxygen blowing amount reaches 3000Nm 3 When the top lance is not on fire, the top lance is proposed to be blown only by the bottom lance, and the total oxygen blowing of the bottom lance is 2000 Nm 3 (ii) a Observing the carbon-oxygen reaction condition and the flame temperature condition at the furnace mouth;
(3) After the bottom blowing is finished, rocking the furnace for three times between minus 20 degrees and 20 degrees to ensure that no cold material is accumulated under a top lance;
(4) Secondary top lance down, top lance oxygen flow 250Nm 3 Min, gun position 170cm, bottom gun oxygen flow 130Nm 3 Min, nitrogen flow 35Nm 3 And/min, simultaneously observing flame at the furnace mouth to judge carbon-oxygen reaction, wherein when the flame is bright and the temperature rises, the successful striking of the fire is realized;
B. neither the bottom gun nor the top gun is on fire:
1) The furnace is shaken to between-3 degrees and-5 degrees, and the bottom gun continuously blows and carries out 130/30 Nm 3 In a large air supply mode of/min, the top lance position is reduced to 1.7m, and the flow of the oxygen lance is increased to 290Nm 3 Min, ensuring the impact depth of a top lance and ensuring that slag on the surface of molten steel is fully blown;
2) Repeatedly lifting the lance position of the oxygen lance between 1.9 and 1.6m when the top lance still cannot normally fire after blowing for 2 minutes;
3) When the continuous oxygen blowing amount reaches 3000Nm 3 When the top and bottom guns are not on fire, executing a bottom gun manual converting mode, and using bottom blowing to start on fire;
4) Switching to manual mode, side gun performing oxygen 200Nm 3 Min, 15Nm of nitrogen or argon flow 3 Min; the furnace is required to be heated to-20 degrees, so that the side gun heating and stirring effects are good; when the gas flow in the picture reaches the set value, the counting of the bottom gun blowing is started to be more than 2000 Nm 3 After oxygen, judging whether bottom blowing oxygen is on fire or not according to the flame at the furnace mouth and the carbon-oxygen reaction condition;
5) If the bottom blowing fire is started, disposing the lower top gun according to a disposal mode A;
6) If the fire hole has no flame or the flame temperature is low, stopping blowing, shaking the furnace shell for 2-3 times in the range of-20 to 60 degrees, shaking the furnace again to-20 degrees, using bottom blowing, and blowing oxygen again by the bottom lance to 1000 Nm 3 When the furnace is shaken to-3 to-5 degrees, the top lance is blown down, the flow of the top lance is carried out at 320Nm 3 And (4) min, 1.7m, rocking the furnace to measure the temperature, and switching to an automatic converting mode until normal smelting is carried out after fire.
2. The method of claim 1A processing method for AOD (argon oxygen decarburization) fire-striking failure is characterized by comprising the following steps: (1) gun position and flow adjustment is performed as follows: duration 1min, top lance: oxygen flow rate: 290Nm 3 Min, gun position: 280cm, bottom gun: oxygen flow rate: 95Nm 3 Min, nitrogen flow: 35Nm 3 Min; duration 1min, top lance: oxygen flow rate: 280Nm 3 Min, gun position: 270cm, bottom gun: oxygen flow rate: 95Nm 3 Min, nitrogen flow: 35Nm 3 Min; duration 1min, top lance: oxygen flow rate: 270Nm 3 Min, gun position: 200cm, bottom gun: oxygen flow rate: 95Nm 3 Min, nitrogen flow: 35Nm 3 Min; duration 3min, top lance: oxygen flow rate: 270Nm 3 Min, gun position: 170cm, bottom gun: oxygen flow rate: 95Nm 3 Min, nitrogen flow: 35Nm 3 Min; duration 3min, top gun: oxygen flow rate: 250Nm 3 Min, gun position: 170cm, bottom gun: oxygen flow rate: 130Nm 3 Min, nitrogen flow: 35Nm 3 /min。
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| CN112375974A (en) * | 2020-10-28 | 2021-02-19 | 南京钢铁股份有限公司 | Deformed steel bar produced by high-chromium molten iron and preparation method thereof |
| CN114752730A (en) * | 2022-05-18 | 2022-07-15 | 山西太钢不锈钢股份有限公司 | Method for improving AOD (argon oxygen decarburization) ignition success rate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107475478A (en) * | 2017-07-14 | 2017-12-15 | 唐山钢铁集团有限责任公司 | Pneumatic steelmaking stays slag melting to open to blow non-ignitable operating method |
| CN107419051A (en) * | 2017-08-23 | 2017-12-01 | 华北理工大学 | Promote the smelting process of converter scrap melting using the dephosphorized slag that gasifies |
| CN110527776A (en) * | 2019-09-27 | 2019-12-03 | 山东钢铁股份有限公司 | The unsuccessful processing method of piping and druming fire is opened in a kind of converter |
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| CN112375974A (en) * | 2020-10-28 | 2021-02-19 | 南京钢铁股份有限公司 | Deformed steel bar produced by high-chromium molten iron and preparation method thereof |
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