CN115466824B - AOD open blow fire failure processing method - Google Patents
AOD open blow fire failure processing method Download PDFInfo
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- CN115466824B CN115466824B CN202211127604.3A CN202211127604A CN115466824B CN 115466824 B CN115466824 B CN 115466824B CN 202211127604 A CN202211127604 A CN 202211127604A CN 115466824 B CN115466824 B CN 115466824B
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention relates to the technical field of metallurgy, in particular to a method for treating failure of AOD open blowing firing, which is characterized by comprising the following steps: the stainless steel refining furnace needs deep decarburization, so that the mode of failure of ignition caused by the basic structure of top-bottom composite blowing is divided into two cases, A) bottom gun blowing is started, and top gun blowing cannot be started; b) The bottom gun and the top gun cannot fire; the invention fully utilizes the characteristics of the AOD furnace top gun and the side gun for combined blowing and provides a disposal method after failure of open blowing and ignition.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for treating AOD open blow failure.
Background
When stainless steel is produced, oxygen is supplied to the molten pool directly by oxygen gun in the decarburization mode, and oxygen flow is in contact with high temperature metal liquid to produce great amount of flame, so called ignition. With the development of stainless steel smelting technology, the added alloy amount of the AOD is increased to reduce the production cost, so that the difficult problem of difficult open blowing and ignition of the AOD is increasingly remarkable. The reasons for unsuccessful blow-on ignition are mainly:
1) The stainless steel mother liquor has large slag content, and a large amount of cold slag enters the AOD furnace caking block to float on the surface of the molten steel so as to prevent oxygen from reacting with the molten steel;
2) The light alloy material is added prematurely, so that a large amount of alloy floats on the surface of molten steel to form a cold steel layer to isolate the reaction of oxygen and molten steel;
3) The slag charge is added too early, and the physicochemical conditions of poor slag melting conditions such as low temperature and the like cause the agglomeration of the slag charge in the early stage to float on the molten steel, and the slag charge is stirred and accumulated along with a side gun to form a large charge mass which covers the surface of the molten steel, so that the ignition failure is caused by the fact that oxygen cannot be effectively penetrated during blowing;
after failure of open blowing and firing, if the oxygen is continuously blown by the top lance, the temperature of mother liquid in the furnace is further reduced, molten steel in the furnace needs to be poured out for re-smelting, or else the side lance head is blocked by cold steel, and the AOD furnace loses the side blowing function and cannot continue smelting.
The prior published patent provides a method for improving open blowing ignition aiming at a converter process, and has poor adaptability to a stainless steel process. In the published patent CN 111139221B, a method for adding coke to support combustion is provided, so that the ignition success rate is improved, but when the coke adding cost is increased, the mode of stainless steel dry slag smelting inevitably wraps the coke into slag, and the subsequent operation is difficult while the cost is wasted; in the published patent CN 107164598A, a method for supporting combustion by slag remaining and coke adding is proposed, and the adaptability to stainless steel smelting is not strong; CN110527776 a in the published patent proposes that the ignition is unsuccessful, slag pouring and molten iron mixing are carried out, nitrogen is used for blowing open the liquid level of steel, for stainless steel smelting, the loss of components in slag is large, the temperature of mother liquor is low, and the problem of failure of AOD ignition cannot be effectively solved. The prior patent cannot treat stainless steel smelting with large alloy addition in time. Because of the characteristics of complicated alloy elements and large alloy quantity in stainless steel smelting, the failure of ignition cannot be solved simply by directly using measures such as molten iron addition or slag pouring, 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 the stainless steel smelting, so that accidents are enlarged; the method for treating the failure of ignition in the stainless steel production process needs to be provided at present, and the ignition is efficiently started on the premise of avoiding secondary accidents; and also avoids the loss of precious alloy in the stainless steel mother liquor and slag.
Disclosure of Invention
The invention aims to solve the problems and provides a method for processing AOD open blow fire failure.
The purpose of the invention is realized in the following way: a method for processing AOD open blow failure is characterized in that: the stainless steel refining furnace needs deep decarburization, so that the mode of failure of ignition caused by the basic structure of top-bottom composite blowing is divided into two cases, A) bottom gun blowing is started, and top gun blowing cannot be started; b) The bottom gun and the top gun cannot fire; for both cases, the specific treatment method is as follows: A. the bottom gun fires, the top gun does not fire: (1) The furnace is rocked to between-3 degrees and-5 degrees, the bottom gun continuously blows, the top gun gradually reduces the gun position, simultaneously reduces the gas flow, ensures the oxygen flow of the side gun, and increases the flow when the top gun cannot fire for a long time; until the top gun fires; (2) If the continuous oxygen blowing amount reaches 3000Nm 3 When the top gun is not yet fired, the top gun is only blown by the bottom gun, and the total oxygen blown by the bottom gun is 2000 Nm 3 The method comprises the steps of carrying out a first treatment on the surface of the Observing the carbon-oxygen reaction condition and flame temperature condition of the furnace mouth; (3) After the bottom blowing converting is finished-shaking the furnace for three times between 20 degrees and 20 degrees to ensure that no cold material is accumulated under the top lance; (4) The secondary down top lance, top lance oxygen flow 250Nm 3 Per minute, gun position 170cm, bottom gun oxygen flow 130Nm 3 Per minute, nitrogen flow rate 35Nm 3 And (3) per minute, observing the flame at the furnace mouth to judge the carbon-oxygen reaction, and when the flame is bright and the temperature rises, obtaining the successful ignition.
B. The bottom gun and the top gun do not fire: 1) The shaking furnace is between-3 degrees and-5 degrees, and the continuous blowing of the bottom gun is carried out 130/30 Nm 3 In the large air supply mode of/min, the gun position of the top lance is reduced to 1.7m, and the flow rate of the oxygen lance is increased to 290-290 Nm 3 And/min, ensuring the impact depth of the top lance and ensuring that slag on the surface of molten steel is fully blown open; 2) When the top lance still cannot fire normally after converting for 2 minutes, repeatedly lifting the lance position between 1.9 and 1.6 m; 3) When the continuous oxygen blowing amount reaches 3000Nm 3 When the top-bottom gun is still not on fire, executing a bottom gun manual converting mode, and using bottom blowing to start fire; 4) Switching to manual mode, the side gun performs 200Nm of oxygen 3 Per min, nitrogen or argon flow 15Nm 3 A/min; the temperature of the side gun is ensured to be raised to-20 degrees, and good stirring effect is ensured; when the gas flow in the picture reaches the set value, the bottom gun blowing is started to count to be more than 2000 Nm 3 After oxygen, judging whether bottom blowing oxygen is on fire or not according to the reaction condition of the flame at the furnace mouth and carbon oxygen; 5) If the bottom blowing fire is started, the lower top gun is treated according to a class A treatment mode; 6) If the furnace mouth is flameless 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 to 1000 Nm by a bottom gun 3 When the furnace is rocked to between-3 degrees and-5 degrees, the top lance blowing is carried out, and the top lance flow rate is 320Nm 3 And (3) measuring the temperature in a shaking furnace at 1.7m, and switching to an automatic converting mode until normal smelting is performed after fire.
(1) Gun position and flow adjustment are 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 A/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 A/min; duration 1min, top gun: oxygen flow rate: 270Nm 3 /min, gun position: 200cm, bottom gun: oxygen flow rate: 95Nm 3 /min, nitrogen flow: 35Nm 3 A/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 A/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。
The beneficial effects of the invention are as follows: the invention fully utilizes the characteristics of the AOD furnace top gun and the side gun for combined blowing and provides a disposal method after failure of open blowing and ignition. The method does not adopt the traditional method of adding combustion improver, adding molten iron and the like to raise the temperature of the premelt, reasonably avoids the method of oxidizing alloy loss in slag caused by deslagging, slag skimming and the like, utilizes the characteristics of high AOD side-blowing stirring power, high oxygen supply intensity and good stirring effect, and uses the mode of raising the temperature by blowing oxygen by bottom blowing to expose the surface of the premelt molten steel in the furnace to restart fire. For the failure cleaning of the ignition of the separation of oxygen and premelt caused by the large slag quantity or the large light scrap steel quantity in the furnace, the success of the secondary ignition of the oxygen lance is ensured by utilizing the mode of raising the temperature of bottom blowing oxygen and converting at a large angle. Fully combines the characteristics of the AOD furnace and efficiently solves the accident of failure in ignition.
Detailed Description
The invention provides a method for efficiently disposing a failure of ignition in a stainless steel smelting process; the method fully utilizes the unique structural characteristics of the AOD, utilizes the structure of the AOD top-bottom composite blowing, makes gas distribution of the top-bottom blowing, and utilizes the characteristic of high stirring strength of an AOD side gun to treat failure of open blowing and ignition of stainless steel smelting on the premise of no slag pouring and no addition of combustion improver.
The specific implementation steps are as follows:
the stainless steel refining furnace needs deep decarburization, so that the mode of failure of ignition caused by the basic structure of top-bottom composite blowing of the stainless steel refining furnace is divided into two cases, A) bottom gun blowing is started, and top gun blowing cannot be started; b) The bottom gun and the top gun cannot fire. For both cases, the specific treatment method is as follows:
A. the bottom gun fires, the top gun does not fire:
1) The furnace is rocked to between-3 degrees and-5 degrees, the bottom gun continuously blows, the top gun gradually reduces the gun position, and meanwhile, the gas flow is properly reduced, the oxygen flow of the side gun is ensured, and the flow is properly increased when the top gun cannot fire for a long time. And executing the following table process by gun position and flow adjustment until the top gun fires.
2) If the continuous oxygen blowing amount reaches 3000Nm 3 When the top gun is not yet fired, the top gun is only blown by the bottom gun, and the total oxygen blown by the bottom gun is 2000 Nm 3 The method comprises the steps of carrying out a first treatment on the surface of the Observing the carbon-oxygen reaction condition and flame temperature condition of the furnace mouth;
3) After bottom blowing converting is finished, the furnace is rocked for three times between-20 degrees and 20 degrees, so that no cold material is accumulated under the top gun;
4) And (3) secondarily pushing down the gun, executing the last flow of the step of the table by the gas flow and the gun position, and simultaneously observing the flame at the furnace mouth to judge the carbon-oxygen reaction, wherein the successful ignition is obtained when the flame is bright and the temperature rises.
B. The bottom gun and the top gun do not fire:
1) The shaking furnace is between-3 degrees and-5 degrees, and the continuous blowing of the bottom gun is carried out 130/30 Nm 3 In the large air supply mode of/min, the gun position of the top lance is reduced to 1.7m, and the flow rate of the oxygen lance is increased to 290-290 Nm 3 And/min, ensuring the impact depth of the top lance and ensuring that slag on the surface of molten steel is fully blown open;
2) When the top lance still cannot fire normally after converting for 2 minutes, repeatedly lifting the lance position between 1.9 and 1.6 m;
3) When the continuous oxygen blowing amount reaches 3000Nm 3 When the top-bottom gun is still not on fire, executing a bottom gun manual converting mode, and using bottom blowing to start fire;
4) Switching to manual mode, the side gun performs 200Nm of oxygen 3 Per min, nitrogen (argon) flow 15Nm 3 A/min; the temperature of the side gun is ensured to be raised to-20 degrees, and good stirring effect is ensured; when the gas flow in the picture reaches the set value, the bottom gun blowing is started to count to be more than 2000 Nm 3 After oxygen, judging whether bottom blowing oxygen is on fire or not according to the reaction condition of the flame at the furnace mouth and carbon oxygen;
5) If the bottom blowing fire is started, the lower top gun is treated according to a class A treatment mode;
6) If the furnace mouth is flameless 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 to 1000 Nm by a bottom gun 3 When the furnace is rocked to between-3 degrees and-5 degrees, the top lance blowing is carried out, and the top lance flow rate is 320Nm 3 And (3) measuring the temperature in a shaking furnace at 1.7m, and switching to an automatic converting mode until normal smelting is performed after fire.
Example 1
150 tons of AOD is used for producing SUS304 stainless steel by using an intermediate frequency furnace, AOD, LF and CC processes, the steel adding amount is 107 tons, the furnace charging temperature is 1402 ℃, the furnace charging carbon content is 3.81 percent, and the silicon content is 2.75 percent; after the steel is added, the furnace is rocked to-4 degrees to start converting, and after the bottom gun is opened to blow, weak flame appears at the furnace mouth, the gas is obviously increased, and the bottom gun is ignited normally; the mouth of the oxygen lance does not have obvious bright flame after entering the body, and the oxygen lance blows slag in the furnace to form a large amount of black smoke in the mouth of the furnace to fail to strike fire, which belongs to the typical oxygen lance failure caused by too thick slag layer in the furnace. After continuous converting for 2 minutes, the oxygen lance is still not successfully ignited, the lance position is reduced to 2 meters, the lance is moved up and down between 2 meters and 1.7 meters, and the flow of the oxygen lance is reduced to 250Nm 3 A/min; side gun actuation 130/35 Nm 3 Flow of oxy-nitrogen per minute; after 2 minutes of blowing, bright flame appears at the furnace mouth, and obvious strong silica and carbon oxygen reactions are presented, so that the ignition is successful.
Example 2
150 ton AOD uses intermediate frequency furnace+AOD+LF+CC process to produce SUS304 stainless steel, and the steel adding quantity is 78 ton, and the furnace charging temperature is 1310 deg.C, which is obviously lower than normal level. During converting, top and bottom blowing has no obvious firing reaction, the gas pressure of a side gun starts to rise, and the typical temperature is low, so that the firing fails. Performing failure handling measure of ignition, switching to manual mode, shaking the furnace to-20 deg., and side gun oxygen200. 200Nm air flow 3 Per min, nitrogen flow 15Nm 3 Per minute, the oxygen blowing amount is 700Nm in three minutes of blowing 3 When the furnace mouth has obvious flame, the bottom gun is ignited successfully. Shaking the furnace to-4 degrees for down-lance converting, and setting the flow of oxygen lance to 250Nm 3 Per min, gun position was set at 1.7 meters, and bottom gun flow oxygen was set at 130. 130Nm 3 Per min, nitrogen was set at 35Nm 3 After the normal gun blowing is carried out for 40 seconds, bright flame appears at the furnace mouth, the reaction of silica and carbon oxygen in the furnace tends to be normal, and the ignition is successful.
Example 3
150 ton AOD uses intermediate frequency furnace +AOD +LF +CC process to produce SUS304 stainless steel, mix steel amount 79t, mix steel temperature 1426 ℃, mix steel carbon content 3.98%, mix steel silicon content 2.78%; normal open blow fire, blowing 800 Nm 3 After oxygen is added into a 55t cold material tank, when the oxygen is blown down again, the oxygen gun is ignited without reaction, the bottom blowing pressure is increased, and the flow rate can not reach the set value. The method is a case of failure in ignition caused by excessive light materials in typical cold materials, cold materials which float upwards after being added and slag which prevent oxygen from contacting molten steel. According to the condition of the furnace, the oxygen flow of the side gun is increased to 130Nm 3 After 3 minutes of blowing, the secondary lance is fired, and the oxygen lance flow is set to 250Nm 3 After 2 minutes of blowing, the furnace mouth still has no obvious fire reaction, the gun is lifted to 20 degrees below zero, the gun flow is set to 200Nm 3 /min oxygen+15 Nm 3 Nitrogen is blown for 5 minutes per minute, the furnace is rocked to 65 degrees, when the secondary furnace is rocked to-5 degrees, the gun is fired, and the flow of the top gun is executed to 320Nm 3 After 1.7m of gun position is executed and 1 minute, the ignition is successful, the gun position is restored to 2.8 m, and the oxygen flow is 280Nm 3 Per min, the bottom gun flow is recovered to 95Nm step by step 3 /min oxygen+35 Nm 3 Nitrogen per min. And switching to an automatic mode and entering a normal converting mode.
The invention fully utilizes the structure of AOD top-bottom composite blowing, makes gas distribution of top-bottom blowing, and utilizes the characteristics of high oxygen supply intensity and high stirring intensity of an AOD side gun to treat failure of open blowing and ignition in stainless steel smelting on the premise of no deslagging and no addition of combustion improver.
The above embodiments are merely examples of the present invention, but the present invention is not limited to the above embodiments, and any changes or modifications within the scope of the present invention are intended to be included in the scope of the present invention.
Claims (2)
1. A method for processing AOD open blow failure is characterized in that: the stainless steel refining furnace needs deep decarburization, so that the mode of failure of ignition caused by the basic structure of top-bottom composite blowing is divided into two cases, A) bottom gun blowing is started, and top gun blowing cannot be started; b) The bottom gun and the top gun cannot fire; for both cases, the specific treatment method is as follows:
A. the bottom gun fires, the top gun does not fire:
(1) The furnace is rocked to between-3 degrees and-5 degrees, the bottom gun continuously blows, the top gun gradually reduces the gun position, simultaneously reduces the gas flow, ensures the oxygen flow of the side gun, and increases the flow when the top gun cannot fire for a long time; until the top gun fires;
(2) If the continuous oxygen blowing amount reaches 3000Nm 3 When the top gun is not yet fired, the top gun is only blown by the bottom gun, and the total oxygen blown by the bottom gun is 2000 Nm 3 The method comprises the steps of carrying out a first treatment on the surface of the Observing the carbon-oxygen reaction condition and flame temperature condition of the furnace mouth;
(3) After bottom blowing converting is finished, the furnace is rocked for three times between-20 degrees and 20 degrees, so that no cold material is accumulated under the top gun;
(4) The secondary down top lance, top lance oxygen flow 250Nm 3 Per minute, gun position 170cm, bottom gun oxygen flow 130Nm 3 Per minute, nitrogen flow rate 35Nm 3 And (3) a step of observing the flame at the furnace mouth to judge the carbon-oxygen reaction, wherein when the flame is bright and the temperature rises, the ignition is successful;
B. the bottom gun and the top gun do not fire:
1) The shaking furnace is between-3 degrees and-5 degrees, and the continuous blowing of the bottom gun is carried out 130/30 Nm 3 In the large air supply mode of/min, the gun position of the top lance is reduced to 1.7m, and the flow rate of the oxygen lance is increased to 290-290 Nm 3 And/min, ensuring the impact depth of the top lance and ensuring that slag on the surface of molten steel is fully blown open;
2) When the top lance still cannot fire normally after converting for 2 minutes, repeatedly lifting the lance position between 1.9 and 1.6 m;
3) When the continuous oxygen blowing amount reaches 3000Nm 3 When the top-bottom gun is still not on fire, executing a bottom gun manual converting mode, and using bottom blowing to start fire;
4) Switching to manual mode, the side gun performs 200Nm of oxygen 3 Per min, nitrogen or argon flow 15Nm 3 A/min; the furnace is rocked 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 bottom gun blowing is started to count to be more than 2000 Nm 3 After oxygen, judging whether bottom blowing oxygen is on fire or not according to the reaction condition of the flame at the furnace mouth and carbon oxygen;
5) If the bottom blowing fire is started, the lower top gun is treated according to a class A treatment mode;
6) If the furnace mouth is flameless 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 to 1000 Nm by a bottom gun 3 When the furnace is rocked to between-3 degrees and-5 degrees, the top lance blowing is carried out, and the top lance flow rate is 320Nm 3 And (3) measuring the temperature in a shaking furnace at 1.7m, and switching to an automatic converting mode until normal smelting is performed after fire.
2. The method for processing failure of open blowing fire of an AOD according to claim 1, wherein: (1) gun position and flow adjustment are 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 A/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 A/min; duration 1min, top gun: oxygen flow rate: 270Nm 3 /min, gun position: 200cm, bottom gun: oxygen flow rate: 95Nm 3 /min, nitrogen flow: 35Nm 3 A/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 A/min; duration 3min, top gun: oxygen gasFlow rate: 250Nm 3 /min, gun position: 170cm, bottom gun: oxygen flow rate: 130Nm 3 /min, nitrogen flow: 35Nm 3 /min。
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| 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 |
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| CN110656215A (en) * | 2019-09-27 | 2020-01-07 | 山东钢铁股份有限公司 | Method for preventing unsuccessful blowing and igniting of converter |
| 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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- 2022-09-16 CN CN202211127604.3A patent/CN115466824B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110656215A (en) * | 2019-09-27 | 2020-01-07 | 山东钢铁股份有限公司 | Method for preventing unsuccessful blowing and igniting of converter |
| 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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