CN108998628B - Low-cost deoxidation process for killed steel - Google Patents
Low-cost deoxidation process for killed steel Download PDFInfo
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- CN108998628B CN108998628B CN201810829216.7A CN201810829216A CN108998628B CN 108998628 B CN108998628 B CN 108998628B CN 201810829216 A CN201810829216 A CN 201810829216A CN 108998628 B CN108998628 B CN 108998628B
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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
- C21C7/06—Deoxidising, e.g. killing
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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
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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
- C21C7/0025—Adding carbon material
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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
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
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Abstract
The invention discloses a low-cost deoxidation process for killed steel, which is characterized in that carbon powder and a composite deoxidizer are added for segmental deoxidation in the converter tapping process, the total oxygen content in molten steel is reduced by controlling the deoxidation time and optimizing the tapping deoxidation operation process, the low-cost carbon powder and the composite deoxidizer are used for replacing the traditional ferro-aluminum deoxidizer, the deoxidation cost can be greatly reduced, and simultaneously non-metal impurities are reduced, the deoxidation process can ensure that the proportion of the level of the impurities in the steel which is less than or equal to 1.5 is increased to 98.21%, the flow rate of continuous casting flocculation is reduced to 0.32%, the deoxidation cost per ton of steel is reduced by 1.58 yuan, and the profit space is increased for enterprises while the steel quality is improved.
Description
Technical Field
The invention relates to a divisional application of an invention patent application of a low-cost converter steelmaking deoxidization process (application number: 2016102555206), belongs to the technical field of steelmaking production, and particularly relates to a low-cost deoxidization process for killed steel.
Background
The steel at the end stage of converter steelmaking smelting is dissolved with excessive oxygen, and the excessive oxygen is separated out to form oxide inclusions and bubbles when the molten steel is solidified, so that the quality of casting blanks and steel products is directly influenced. It is therefore desirable to reduce the end-point oxygen content of the converter during steelmaking, which is the source of inclusions in the steel. At present, the deoxidation method used in the domestic industrial steelmaking production process mainly comprises the following steps: the aluminum deoxidation method, in which metallic aluminum is added to molten steel in a ladle at the time of tapping, is relatively simple, but has unstable deoxidation effect and is liable to generate Al2O3Non-metal-like inclusions, wherein the particles of the inclusions are small and are not easy to float upwards to form slag, so that the non-metal inclusions in steel are increased, the price of aluminum exceeds 1 ten thousand yuan/ton, and the cost of steel per ton is high; the carbon deoxidation method is characterized in that carbon-containing materials are added into a steel ladle before steel tapping, the deoxidation method is simple, the deoxidation effect is unstable, the ladle turning of molten steel is easy to generate, potential safety hazards appear, and the molten steel is carburized; there are also methods such as a calcium-silicon alloy deoxidation method and a cored wire deoxidation method, which are effective in deoxidation but costly.
For example, the patent "deoxidizer for converter steelmaking" (application No. 89105941.5) discloses tappingBefore the deoxidation, a deoxidizer is put into the ladle for deoxidation, and the deoxidizer comprises the following components in percentage by weight: 65-96% of CaC24-35% SiC, because the deoxidation capability of the method is that Si and Ca are more than C, Si and Ca are firstly deoxidized in molten steel, and carbon is easy to react incompletely to generate carbon increase; the patent "a low-cost electric arc furnace tapping deoxidation process" (application No. CN 200710031301) discloses a three-step deoxidation process adopting carbon powder pre-deoxidation, ferrosilicon shallow deoxidation and aluminium block deep deoxidation, and the method can reduce the deoxidation cost but adds a large amount of aluminium to produce Al2O3The impurities are not easy to form slag and remove, the viscosity of the molten steel is increased, and the flocculating flow of the casting machine is easy to cause.
Therefore, a new low-cost deoxidation technology is needed for converter deoxidation urgently, and the deoxidation cost of the converter is reduced while molten steel is purified.
Disclosure of Invention
The technical task of the invention is to provide a low-cost deoxidation process for killed steel, which adopts sectional deoxidation, utilizes low-cost deoxidizer to replace part of high-cost deoxidizer, reduces the deoxidation cost of the converter when achieving the same deoxidation effect, and can effectively control inclusions in steel and stabilize the product quality.
The technical scheme for solving the technical problem is as follows: a killed steel low-cost deoxidation process is characterized by comprising the following deoxidation process steps:
(1) adding simple substance carbon powder after converter tapping, wherein the earliest adding time is 20S after tapping, and the simple substance carbon powder is added within the time range of 60S after tapping;
(2) after the carbon powder is added for 20-30S, adding a compound deoxidizer, and finishing adding all the compound deoxidizers within the time range of 180S after tapping; the composite deoxidizer comprises 47.5% of silicon, 24.5% of calcium and 28% of barium.
The addition amount of the single carbon powder in the step (1) is 0.17-0.58 kg/t.
The adding amount of the composite deoxidizer in the step (2) is 1.2-1.8 kg/t.
The specific adding time of the compound deoxidizer depends on the tapping quantity, but the compound deoxidizer needs to be completely added within the time range of 180S after tapping.
Compared with the prior art, the invention has the following outstanding beneficial effects:
1. the product has good deoxidation effect, a segmented deoxidation process is adopted, simple substance carbon powder is added in the early stage of tapping, the recarburization in steel is ensured to be less than 100ppm, the maximum deoxidation amount is realized while the excessive reaction and incomplete recarburization of the added carbon powder are avoided, the utilization rate of the carbon powder is 50%, and the best effect of carbon powder deoxidation is achieved. Adding silicon with the content of 40.5-49.3%, calcium with the content of 18.5-26.0%, barium with the content of 27.7-31.5% and aluminum with the content of 0-2% into 180S of the steel, floating the inclusions under the good dynamic condition of converter steel tapping, reducing the total oxygen content in the steel from 48ppm to 35ppm, reducing 13ppm, and having good deoxidation and inclusion control effects.
2. The deoxidation cost is low, by using the deoxidation mode, the consumption of aluminum and iron is reduced by 1.57kg per ton of steel, and the deoxidation cost is reduced to 12.65 yuan from 14.23 yuan per ton of steel; the deoxidation cost per ton of steel is reduced by 1.58 yuan, and the deoxidation cost is reduced, so that the benefit space of an enterprise is effectively improved.
3. The content of non-metal inclusions in steel is effectively reduced, the quality of molten steel is improved, the silicon-calcium-barium composite deoxidizer contains 0-2% of aluminum, the dosage is reduced by more than 80% compared with other aluminum deoxidization, meanwhile, the inclusions generated by the aluminum deoxidization can be modified in time due to the existence of calcium and barium, the yield of aluminum is more than 80%, oxide inclusions in the steel are obviously reduced, and the proportion of the inclusions in the steel with the grade less than or equal to 1.5 is improved from 93.32% to 98.21%; the flow rate of the continuous casting batt is reduced from 1.03% to 0.32%.
Detailed Description
The present invention will be further described with reference to the following embodiments.
According to the different deoxidation degrees during smelting, the steel is divided into boiling steel, semi-killed steel and killed steel. For better data comparison, the steel grades selected in the control group and the examples are killed steel (Q235B/Q345B/A36 Cr/SS400Cr/SAE1008B and other steel grades), but the deoxidation process disclosed by the invention is applicable to all non-aluminum killed steel except ultra-low carbon steel (C < 0.04%), low silicon steel (Si < 0.10%).
Control group
The process steps of the killed steel (steel grade A36 Cr) are as follows:
(1) opening the ladle to a converter tapping position, opening a bottom blowing system, and carrying out bottom blowing at a flow rate of 500 m/h;
(2) and starting timing when the steel is discharged from the rocking furnace, and adding 1.7kg of aluminum-iron deoxidizer for deoxidation (containing 45 percent of aluminum) in the later tapping period (if the tapping time is 7min, the adding time is 4min after tapping).
After the addition of the deoxidizer is finished, closing bottom blowing argon after the steel discharge is finished; opening the ladle to an argon station, opening bottom blowing argon and stirring to ensure that the components and the temperature are uniform, and carrying out bottom blowing flow 300m for carrying out heavy planting/h; and after blowing argon for 180S in an argon station, determining oxygen, measuring temperature, taking component samples, and moving the ladle to an LF refining furnace for refining treatment.
The control group is a deoxidation process which is found by the inventor before the process improvement, and the deoxidation method has the defects that ① aluminum-iron alloy is exposed in humid air to form a primary battery, aluminum is corroded as a positive electrode, a plurality of small holes are formed in the remaining iron, the iron is easily pulverized and influences the use, ② aluminum-iron deoxidizer is added for deoxidation, the price of the aluminum-iron deoxidizer is high, the using amount is large, the cost of each ton of steel is directly influenced, and [ O ] in ③ molten steel]And [ Al]Easily react to generate Al2O3④ influences the quality of final products, and the products obtained by the deoxidation method are detected that the proportion of inclusions in the steel with the level less than or equal to 1.5 is 93.32%, the flocculation flow rate of a casting machine is 1.03%, and the economic loss of enterprises is increased.
Example 1
For killed steel (steel grade a36 Cr) process steps:
(1) opening the ladle to a converter tapping position, opening a bottom blowing system, and carrying out bottom blowing at a flow rate of 300 m/h;
(2) and starting timing when the furnace is shaken to discharge steel, starting to add 0.58kg/t of simple substance carbon powder (the adding amount of steel per ton is 0.58 kg) after 20S of steel tapping, and finishing adding the simple substance carbon powder within the time range of 40S after the steel tapping. In order to better realize carbon powder deoxidation, the bottom blowing flow is reduced to 200 m/h after carbon addition, and CO gas generated by carbon powder deoxidation is used for molten steel stirring. In addition, in order to prevent safety accidents caused by ladle turning of molten steel due to premature addition of carbon powder, the tapping time is generally about 7min, so that the proper time for adding simple substance carbon powder is within the time range of 20-60S after tapping, the carbon powder is ensured to be fully contacted with oxygen, and the deoxidation rate of the carbon powder is improved;
(3) after the carbon powder is added for 30S, 1.2kg/t of compound deoxidizer is added, and all the compound deoxidizers are added within the time range of 80S-140S after tapping. The composite deoxidizer comprises 49.3% of silicon, 18.5% of calcium, 31.2% of barium and 1% of aluminum in percentage by mass. The time interval between the carbon powder and the composite deoxidizer is an essential element, and the purpose of the time interval is to prevent the carbon powder from reacting with oxygen components in the steel and prevent recarburization in the steel.
After the addition of the deoxidizer is finished, other required alloys can be added according to the requirements of final products, and the bottom blowing argon is closed after the steel discharge is finished; opening the ladle to an argon station, opening bottom blowing argon and stirring to ensure that the components and the temperature are uniform, and carrying out bottom blowing at a flow rate of 150m for carrying out heavy planting/h; and after blowing argon for 180S in an argon station, determining oxygen, measuring temperature, taking component samples, and moving the ladle to an LF refining furnace for refining treatment.
The adding time of the dual deoxidizer is closely related to whether the deoxidation can achieve the effect: according to the deoxidation mode, carbon powder is added firstly within a time period of 20-60S after tapping according to the proportion of 0.17-0.58 kg/t, the time is stopped for 20-30S after the carbon is added, CO gas generated by the reaction of [ C ] [ O ] in a steel ladle is discharged, the control of recarburization in steel is facilitated to be less than 100ppm, the deoxidation amount is maximum while the incomplete recarburization caused by excessive reaction of the added carbon powder is avoided, the best effect of carbon powder deoxidation is achieved, and the carbon powder deoxidation utilization rate is more than 50%. And the carbon powder deoxidation product is CO gas, can be discharged from molten steel in time, and can not form new inclusions.
The process is characterized in that a composite deoxidizer (40.5-49.5% of silicon, 18.5-26.0% of calcium, 27.0-31.5% of barium and 0-2% of aluminum) is added in 180S at the early stage of tapping. The process uses simple substance carbon to perform basic deoxidation, so that the components and the use amount of the composite deoxidizer are greatly different from those of the prior art. Firstly, the composite deoxidizer in the process design has no iron component and greatly reduced aluminum proportion, even has no aluminum component, compared with the prior art for removing aluminum and ironOxygen can generate a large amount of aluminum oxide deoxidation products difficult to remove and MnS, impurities are difficult to float upwards in time to remove and are remained in the molten steel, the purity of the molten steel is influenced, the use amount of the aluminum-iron deoxidizer is greatly reduced by using the deoxidation mode of the process for deoxidation, the deoxidation cost is reduced while the quality of the molten steel is improved and the flocculation probability of a casting machine is reduced, and the profit space is improved for enterprises. Secondly, the proportion of Si, Ca and Ba components is more reasonable: the alkaline earth metals Ca and Ba have low boiling points and are easy to volatilize and lose, while Si can reduce the volatilization loss of Ca and Ba, improve the utilization rate of elements and deoxidize the products CaO-SiO of Ca and Si2. The existence of Ca increases the solubility of Si, simultaneously Ca can denature nonmetallic inclusions so as to be easy to remove, the deoxidation utilization rate of Ca and Si is improved, and the existence of Ba can improve the deoxidation effect and desulfurization capability of Ca and Si and refine crystal grains. In addition, the addition amount of the conventional composite deoxidizer containing Si, Ca and Ba is 10-20 kg/t, which is caused by small contact area between the deoxidizer and molten steel and incapability of timely dissipating deoxidized products, so that the deoxidation efficiency is affected, and therefore, in order to achieve a good deoxidation effect, the use amount of the deoxidizer has to be increased, which means that the cost is increased and the product purity is reduced. In the process, carbon powder is adopted for early basic deoxidation, useful gas and fine dispersed particles are rapidly generated, CO gas enhances molten steel disturbance, silicon, calcium and barium can be fully mixed with the molten steel under the disturbance condition, deoxidation products continuously and rapidly float and absorb upwards, chemical effects and physical effects are superposed, the desulfurization and inclusion denaturation capabilities of the calcium and the barium are fully exerted, deoxidation impurities and MnS can be effectively reduced, the purity of the molten steel is improved, the castability of the molten steel is further improved, the flocculation flow of a casting machine is reduced, and the casting blank quality is improved. And the process changes the mode that the traditional deoxidizer is added in the middle and later tapping periods, and completes the addition of the deoxidizer twice within 20-180S after tapping, thereby realizing gradient deoxidation and the coordination of chemical reaction and physical disturbance, and greatly saving the cost on the aspect of ensuring the deoxidation effect. The specific adding amount of the simple substance carbon powder and the composite deoxidizer depends on the number of the tapping, so the adding time is different, and the pilot test result shows that the compound deoxidizer can completely remove the simple substance carbon powder within the time range of 60S after the tapping as long as the simple substance carbon powder is addedThe oxygen agent is added within the time range of 180S after tapping, so that the complete deoxidation effect can be achieved. In the embodiment, the addition of the simple substance carbon powder is finished after tapping for 40S, and the addition of all the composite deoxidizers is finished for 140S.
Example 2
Deoxidation process steps for killed steel (steel grade Q345B 3):
(1) opening the ladle to a converter tapping position, opening a bottom blowing system, and carrying out bottom blowing at a flow rate of 250 m/h;
(2) and starting timing when the furnace is shaken to discharge steel, and starting to add 0.36kg/t of simple substance carbon powder after tapping for 40S. After carbon addition, the bottom blowing flow is reduced to 150 m/h, and the simple substance carbon powder is added within the time range of 60S after tapping;
(3) after the carbon powder is added for 25S, adding 1.5kg/t of compound deoxidizer, and finishing adding all the compound deoxidizers within the time range of 80-130S after tapping; the composite deoxidizer comprises (by mass) silicon 47.5%, calcium 24.5%, and barium 28%.
In the embodiment, the addition of the simple substance carbon powder is finished after tapping for 60S, and the addition of all the composite deoxidizers is finished for 130S.
Example 3
Deoxidation process steps for killed steel (steel grade Q235B 2):
(1) opening the ladle to a converter tapping position, opening a bottom blowing system, and carrying out bottom blowing at a flow rate of 200 m/h;
(2) and starting timing when the furnace is shaken to discharge steel, and starting to add 0.17kg/t of simple substance carbon powder after 58S of steel is discharged. After carbon addition, the bottom blowing flow is reduced to 100 m/h, and the simple substance carbon powder is added within the time range of 60S after tapping;
(3) after the carbon powder is added for 20S, adding 1.8kg/t of compound deoxidizer, and finishing adding all the compound deoxidizers within the time range of 130S-180S after tapping; the composite deoxidizer comprises (by mass) silicon 44.4%, calcium 25.9%, barium 27.7%, and aluminum 2%.
In the embodiment, the addition of the simple substance carbon powder is finished 60S after tapping, and the addition of all the composite deoxidizers is finished 180S.
Example 4
Deoxidation process step for killed steel (steel grade a36 Cr):
(1) and (3) starting timing when the steel is discharged by shaking the furnace, starting to add 0.58kg/t of simple substance carbon powder after 20S of steel tapping, wherein 50 percent of the simple substance carbon powder is added into the ladle along with steel flow, and 50 percent of the simple substance carbon powder is blown into the ladle from the bottom of the ladle through a ladle bottom blowing system (bottom blowing flow rate 300 m/h). After carbon addition, the bottom blowing flow is reduced to 200m for carrying out the top-blown dry powder/h, and the simple substance carbon powder is added within the time range of 60S after tapping;
(2) after the carbon powder is added for 30S, adding 1.2kg/t of compound deoxidizer, and finishing adding all the compound deoxidizers within the time range of 90-140S after tapping; the composite deoxidizer comprises (by mass) silicon 40.5%, calcium 26.0%, barium 31.5%, and aluminum 2%. Part of carbon powder is blown into the bottom of the steel ladle by using argon blown from the bottom of the steel ladle as a medium, and the purpose of blowing the carbon powder into the bottom of the steel ladle is mainly to improve the contact time and the contact surface area of the carbon powder and the molten steel, facilitate the reaction of carbon and oxygen and improve the deoxidation utilization rate of the molten steel; meanwhile, the carbon powder is small in density, floats on the surface of molten steel after being added, is more adverse to the reaction with oxygen in steel after being added later, is too early to be added, is gathered at the bottom of a ladle, and is not timely discharged along with the increase of the molten steel, so that the phenomenon of ladle turning is easily caused in the later period, the argon is used for blowing in the bottom to effectively avoid the gathering of the carbon powder, and the generated gas is timely discharged along with the blowing of the argon at the bottom, so that the phenomenon of ladle turning can be effectively avoided. In the embodiment, the addition of the simple substance carbon powder is finished 35S after tapping, and the addition of all the composite deoxidizers is finished 90S.
The product results for the control and four example groups are shown in the following table:
| categories of | Total oxygen in steel (ppm) | Carbon content of molten steel (%) | The grade of the inclusions in the steel is less than or equal to 1.5 (%) | Casting machine flocculation rate (%) | Ton steel cost (Yuan/t steel) |
| Control group | 48 | 0.09 | 93.32% | 1.03% | 14.23 |
| Example 1 | 38 | 0.11 | 97.86% | 0.41% | 12.83 |
| Example 2 | 35 | 0.09 | 98.21% | 0.32% | 12.65 |
| Example 3 | 40 | 0.06 | 97.29% | 0.45% | 13.05 |
| Example 4 | 36 | 0.09 | 98.06% | 0.34% | 12.69 |
As can be seen from the above table, the total oxygen content in the steel of each example group is obviously lower than that of the control group, but the carbon content in the molten steel is not influenced, and the deoxidation effect is positive. And the proportion of the level of the inclusions in the steel is less than or equal to 1.5 is increased from 93.32% to 98.21%, the flow rate of the continuous casting flocculation is reduced from 1.03% to 0.32%, and the quality of the final product is improved. The deoxidation cost is reduced from 14.23 yuan per ton of steel to 12.65 yuan; the deoxidation cost per ton of steel is reduced by 1.58 yuan, and the deoxidation cost is reduced, so that the benefit space of an enterprise is effectively improved.
It should be noted that while the invention has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various obvious changes can be made therein without departing from the spirit and scope of the invention.
Claims (1)
1. A killed steel low-cost deoxidation process is characterized by comprising the following deoxidation process steps:
(1) opening the ladle to a converter tapping position, opening a bottom blowing system, and carrying out bottom blowing at a flow rate of 250 m/h;
(2) adding simple substance carbon powder after converter tapping, wherein the earliest adding time is 20S after tapping, the bottom blowing flow is reduced to 150m for carrying out the top-blown cultivation/h after carbon adding, and the simple substance carbon powder is added within the time range of 60S after tapping; the adding amount of the simple substance carbon powder is 0.36 kg/t;
(3) after the carbon powder is added for 20-30S, adding a compound deoxidizer, and finishing adding all the compound deoxidizers within the time range of 80-130S after tapping; the adding amount of the composite deoxidizer is 1.2-1.8 kg/t; the composite deoxidizer comprises 47.5% of silicon, 24.5% of calcium and 28% of barium.
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| CN109468432A (en) * | 2018-12-18 | 2019-03-15 | 南京钢铁股份有限公司 | A kind of method of deoxidation being suitable for carbon aluminium-killed steel |
| CN109880972B (en) * | 2019-04-01 | 2021-04-13 | 山东钢铁集团日照有限公司 | Production process of SPHC low-carbon steel |
| CN113234890A (en) * | 2021-04-20 | 2021-08-10 | 西峡飞龙特种铸造有限公司 | Composite deoxidizer and deoxidizing method for heat-resistant steel casting |
| CN114592104A (en) * | 2022-03-18 | 2022-06-07 | 马鞍山乌力平冶金技术工作室 | Method and device for deoxidizing in steelmaking end-point melt furnace |
| CN115287403A (en) * | 2022-08-15 | 2022-11-04 | 广东韶钢松山股份有限公司 | Low-carbon low-silicon cold heading steel deoxidation method |
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| CN100370036C (en) * | 2005-12-13 | 2008-02-20 | 东北大学 | Slit type ladle bottom blowing powder injection process and apparatus |
| CN101748245A (en) * | 2008-12-17 | 2010-06-23 | 攀枝花新钢钒股份有限公司 | Method for steelmaking |
| CN102051440A (en) * | 2009-11-10 | 2011-05-11 | 攀钢集团钢铁钒钛股份有限公司 | Molten steel deoxidizing and carbureting method and steelmaking method |
| CN102260827B (en) * | 2010-05-26 | 2013-04-10 | 攀钢集团钢铁钒钛股份有限公司 | Method for preparing drill collar steel |
| CN102321778A (en) * | 2011-09-22 | 2012-01-18 | 首钢总公司 | Method of deoxidation of medium carbon aluminum-containing steel in converter |
| CN102634641A (en) * | 2012-05-11 | 2012-08-15 | 武汉钢铁(集团)公司 | Deoxidation method for converter tapping molten steel |
| CN103074462A (en) * | 2013-02-01 | 2013-05-01 | 首钢水城钢铁（集团）有限责任公司 | Deoxidation method used in converter steelmaking process |
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2016
- 2016-04-21 CN CN201610255520.6A patent/CN105695664B/en active Active
- 2016-04-21 CN CN201810829252.3A patent/CN108588333B/en active Active
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| Publication number | Publication date |
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| CN105695664A (en) | 2016-06-22 |
| CN108588333B (en) | 2020-05-15 |
| CN105695664B (en) | 2018-08-31 |
| CN108588333A (en) | 2018-09-28 |
| CN108998628A (en) | 2018-12-14 |
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Denomination of invention: A low cost deoxidation process for killed steel Effective date of registration: 20211222 Granted publication date: 20200515 Pledgee: Rizhao Bank Co., Ltd Pledgor: RIZHAO BAOHUA NEW MATERIAL CO.,LTD. Registration number: Y2021980015871 |