CN110453032B - Method for smelting ultralow manganese steel by using high-manganese molten iron - Google Patents
Method for smelting ultralow manganese steel by using high-manganese molten iron Download PDFInfo
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- CN110453032B CN110453032B CN201910806190.9A CN201910806190A CN110453032B CN 110453032 B CN110453032 B CN 110453032B CN 201910806190 A CN201910806190 A CN 201910806190A CN 110453032 B CN110453032 B CN 110453032B
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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
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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
- C21C5/36—Processes yielding slags of special composition
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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
- C21C7/072—Treatment with gases
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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
- C21C7/076—Use of slags or fluxes as treating agents
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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 discloses a method for smelting ultralow manganese steel by using high-manganese molten iron, belonging to the field of ferrous metallurgy. According to the method for smelting the ultra-low manganese steel by using the high-manganese molten iron, provided by the invention, a double-slag smelting process is adopted in the converter process to remove most of elements such as manganese in the molten iron, a converter low-temperature steel tapping process and an LF refining furnace deep demanganization process are adopted to further demanganize, the manganese content in the molten iron can be stably controlled below 0.02% under the condition that the molten iron fed into the converter is the high-manganese molten iron with the manganese content higher than 0.40%, and the smelting requirement of the ultra-low manganese steel is met.
Description
Technical Field
The invention belongs to the field of ferrous metallurgy, particularly relates to a method for smelting ultralow manganese steel by using high manganese molten iron, and particularly relates to a method for smelting ultralow manganese steel by using high manganese molten iron with the content of more than 0.40%.
Background
In order to meet the current market demand, the steel grade of special steel with high added value has very low requirement on Mn element in molten steel, the demanganization capability of a converter is limited, and most steel mills have the limit of ore raw material conditions, the manganese content of molten iron entering the converter is about 0.40%, and when the molten iron is used for smelting ultra-low manganese steel grade (Mn is less than or equal to 0.02%), the lowest manganese content of the converter is about 0.06%, and the requirement of the steel grade can not be met. In the background, the technical problem of smelting ultra-low manganese steel by using high manganese molten iron becomes more and more prominent. Directly restricts the development and production of ultra-low manganese steel represented by industrial pure iron.
Manganese as a metal element can be separated from molten iron or molten steel only in an oxidation slagging mode; the key of the oxidation-reduction reaction is to provide oxygen for a metallurgical system and transfer the oxygen to a reaction zone to realize the direct or indirect oxidation of impurity elements in the molten iron. The choice of the demanganization mode of the molten iron is generally limited by the field equipment, the environment, the conditions of the raw materials used for demanganization, etc.
The method is limited by factors such as field equipment, environment, conditions of raw materials used for demanganization and the like, from the perspective of the prior art, the demanganization task of the molten iron is mainly completed in a converter link, and the summary of the conditions of smelting the ultra-low manganese steel in the early stage is as follows: the manganese content of the molten iron fed into the converter is concentrated to 0.39-0.41 percent (average is 0.40 percent), the residual manganese content at the end point of the converter is 0.050-0.057 percent (average is 0.054 percent), 0.05 percent or even lower cannot be achieved, and the smelting of the ultra-low manganese steel cannot be carried out.
In summary, there is a need for a new method for smelting ultra-low manganese steel by using high manganese molten iron, so as to ensure that high value-added special steel with strict control on manganese content is smelted under the condition of relatively poor molten iron conditions.
Disclosure of Invention
In order to overcome the defect that the existing smelting process can not smelt the ultra-low manganese steel by using high manganese molten iron with the manganese content higher than 0.40 percent, the invention provides a method for smelting the ultra-low manganese steel by using the high manganese molten iron, and an LF furnace deep demanganization process is originally developed, and the process can smelt molten steel with the manganese content lower than 0.02 percent by using the high manganese molten iron as a raw material.
In the traditional process route, under the condition that the charged molten iron is high-manganese molten iron with the manganese content higher than 0.40 percent, the manganese content in the molten iron can only be stably controlled to be below 0.06 percent.
The invention further removes the manganese element in the LF furnace by innovatively optimizing the production process of the traditional LF refining furnace. Finally, the manganese content in the molten steel is stably reduced to be below 0.02 percent.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for smelting ultra-low manganese steel by using high-manganese molten iron comprises the following steps:
s1 smelting process of converter adopting double slags
Adopting a double-slag method operation in the converter treatment process, and deslagging when the oxidation of manganese and silicon in steel is basically finished and the oxidation of carbon is gradually changed from being inhibited to beginning a violent oxidation period; slag charge and iron shot are added in the slagging process, and the manganese return phenomenon in the later stage of converter blowing is effectively inhibited by a control method of large slag quantity, end point temperature and end point oxygen in the slagging process;
s2 Process for deep demanganization by converter low-temperature tapping and LF refining furnace
Wherein the temperature of low-temperature tapping of the converter is as follows: 1560-1690 ℃;
the deep demanganization of the LF refining furnace comprises two slagging processes: primary slagging and secondary slagging.
In the step S1, the slag is poured when blowing is started for 4 min; and/or
The addition amount of slag charge is 15-20t and the addition amount of iron sheet ball is 5-20t in the slagging process.
In the slagging process, the end point temperature is controlled to be 1560-1690 ℃, the end point oxygen is controlled to be 950-1050 ppm, the manganese return phenomenon in the later stage of converter blowing is effectively inhibited, and the manganese content in molten steel is reduced to be below 0.06% during converter tapping.
The in-place temperature of the LF refining furnace for primary slagging in the step S2 is 1520-1560 ℃; the addition amount of the slag former is 8-12 kg per ton of steel, and the refining heating temperature is 1590-1610 ℃; heating the steel ladle at the refining temperature to 1590-1610 ℃, and blowing argon gas from the bottom of the steel ladle to stir and demanganize the steel ladle;
the in-place temperature of the LF refining furnace for secondary slagging is 1520-1560 ℃; the addition amount of the slag former is 4-6 kg per ton of steel, and the refining heating temperature is 1590-1610 ℃; and heating the steel ladle at the refining temperature to 1590-1610 ℃, and then blowing argon gas from the bottom of the steel ladle to stir and demanganize the steel ladle.
The slagging agent for the first slagging and the second slagging is a mixture of lime and a modifier, wherein the ratio of the lime to the modifier is 9-12: 0.8-1.5.
The argon introducing amount of the ladle bottom blowing argon stirring demanganization of the first slagging and the second slagging is 1200L/min, and the argon introducing time is 6-10 min.
And carrying out slagging-off treatment after the first slagging of the LF refining furnace is finished.
The manganese content of the molten steel in position of the continuous casting machine is stably reduced to be below 0.02 percent through the deep demanganization of the LF refining furnace.
Based on the technical scheme, the method for smelting the ultralow manganese steel by using the high-manganese molten iron firstly adopts a double-slag method in the converter treatment process, and slag dumping is carried out when the oxidation of manganese and silicon in the steel is basically finished and the oxidation of carbon is gradually changed from the inhibition to the violent oxidation period to be started at the slag dumping time, so that the maximum manganese oxide is dumped, and the smooth slag dumping process is ensured. The consumption of slag charge and iron sheet balls is increased in the slagging process, the phenomenon of 'manganese return' in the later period of converter blowing is effectively inhibited by a control method of large slag quantity, end point temperature and end point oxygen in the slagging process, and the manganese content in molten steel can be reduced to be below 0.06% by steel making through a double-slag process. And then, on the basis of demanganization of the converter, further demanganization is carried out in an LF refining furnace, the manganese content in the molten steel is reduced to be below 0.05 percent so as to meet the requirement of ultra-low manganese steel, the proportion of a slag charge structure is optimized in the LF refining process, the demanganization process of the converter is simulated, the LF furnace does not carry out deoxidation tapping through the converter, the refining slag is oxidized slag through the reaction of the steel slag, the capacity of MnO of the steel slag is increased by improving the slag amount and adjusting the components of the steel slag, so that the distribution ratio of manganese in the steel slag and the molten steel is increased, favorable conditions are provided for demanganization, and the LF refining furnace has demanga. In the process of LF furnace electric arc heating, carbon in the graphite electrode reacts with oxygen in slag to obtain good foam slag, the slag-steel interface area is increased, and the dynamic condition of the demanganization reaction is enhanced, so that manganese is better removed; and the argon is used for stirring, the dynamic condition of the demanganization reaction is enhanced, the steel slag reaction is accelerated, so that the manganese in the molten steel can be better removed, and the aim of reducing the manganese content in the molten steel in the LF refining process is finally fulfilled.
Compared with the prior art, the invention has the following beneficial effects:
in the traditional process, the demanganization effect of the converter can reach 80-85%, the manganese content in molten steel can only be stably controlled below 0.06% under the condition that molten iron entering the converter is high-manganese molten iron with the manganese content higher than 0.40%, and the LF refining furnace has deep demanganization capacity by optimizing the charge ratio of the LF refining furnace, and the operation is strengthened, so that manganese elements are further removed in the LF furnace, and finally the manganese content of molten steel in the in-position of a continuous casting machine is stably reduced to below 0.02%.
Detailed Description
The present invention will be described in detail with reference to the following specific embodiments.
In one embodiment of the invention, the method for smelting the ultra-low manganese steel by the high manganese molten iron comprises the following steps:
s1, removing most of manganese and other elements in molten iron by adopting a double-slag process
The double-slag method is adopted in the converter treatment process, and slag dumping is carried out when the oxidation of manganese and silicon in steel is basically finished and the oxidation of carbon is gradually changed from the inhibited state to the violent oxidation period, so that the maximum manganese oxide is promoted to be dumped, and the slag dumping process is ensured to be smooth. The consumption of slag charge and iron sheet balls is increased in the slagging process, the phenomenon of 'manganese return' in the later period of converter blowing is effectively inhibited by a control method of large slag quantity, end point temperature and end point oxygen in the slagging process, and the manganese content in molten steel can be reduced to be below 0.06% by steel making through a double-slag process.
Wherein, deslagging is carried out when blowing is started for 4 min; the adding amount of slag charge is 15-20t and the adding amount of iron sheet ball is 5-20t in the slagging process; in the slagging process, the end point temperature is controlled to be 1560-1690 ℃, and the end point oxygen is controlled to be 950-1050 ppm.
S2 Process for deep demanganization by converter low-temperature tapping and LF refining furnace
The method is characterized in that the method comprises the steps of performing further demanganization in an LF refining furnace on the basis of demanganization of a converter, reducing the manganese content in molten steel to be below 0.05% so as to meet the requirement of ultra-low manganese steel, optimizing the proportion of a slag charge structure in the LF refining process, simulating a demanganization process of the converter, tapping steel by the LF furnace without deoxidation of the converter, enabling refined slag to be oxidized slag through a steel slag reaction, and increasing the capacity of MnO of the steel slag by improving the slag amount and adjusting the components of the steel slag, so that the distribution ratio of manganese in the steel slag and the molten steel is increased, favorable conditions are provided for demanganization, and the LF refining furnace has dema. In the process of LF furnace electric arc heating, carbon in the graphite electrode reacts with oxygen in slag to obtain good foam slag, the slag-steel interface area is increased, and the dynamic condition of the demanganization reaction is enhanced, so that manganese is better removed; and the argon is used for stirring, the dynamic condition of the demanganization reaction is enhanced, the steel slag reaction is accelerated, so that the manganese in the molten steel can be better removed, and the aim of reducing the manganese content in the molten steel in the LF refining process is finally fulfilled.
Wherein the temperature of low-temperature tapping of the transfer furnace in the step S2 is 1560-1690 ℃; the LF refining furnace comprises two slagging processes: primary slagging and secondary slagging, wherein the in-place temperature of the LF refining furnace for the primary slagging is 1520-1560 ℃; the addition amount of the slag former is 8-12 kg per ton of steel, and the refining heating temperature is 1590-1610 ℃; heating the steel ladle at the refining temperature to 1590-1610 ℃, and blowing argon gas from the bottom of the steel ladle to stir and demanganize the steel ladle; the in-place temperature of the LF refining furnace for secondary slagging is 1520-1560 ℃; the addition amount of the slag former is 4-6 kg per ton of steel, and the refining heating temperature is 1590-1610 ℃; and heating the steel ladle at the refining temperature to 1590-1610 ℃, and then blowing argon gas from the bottom of the steel ladle to stir and demanganize the steel ladle.
Wherein the slag former is a mixture of lime and a modifier, and the weight ratio of the lime to the modifier is 9-12: 0.8-1.5. The argon introducing amount of the ladle bottom blowing argon stirring demanganization of the first slagging and the second slagging is 1200L/min, and the argon introducing time is 6-10 min.
Example 1
The molten iron with the manganese content of 0.423 percent is used as a raw material, smelting demanganization is carried out by applying a converter double-slag-method smelting process, low-temperature tapping in a converter link creates better thermodynamic conditions for further demanganization, the in-place temperature of an LF (ladle furnace) is 1529 ℃, and the Mn content in the in-place molten steel of the LF is 0.055 percent. 4269kg of lime and 329kg of a modifier are added in the LF smelting refining process, the accumulated heating is carried out for 31 minutes, the manganese content is 0.0165% when the materials are off-site, and the specific parameters are shown in the following table 1.
Example 2
The molten iron with the manganese content of 0.416 percent is used as a raw material, smelting is carried out by using a converter double-slag method smelting process, low-temperature tapping is carried out in a converter link, and a better thermodynamic condition is created for further demanganization, wherein the in-place temperature of an LF (ladle furnace) is 1527 ℃, and the Mn content in the in-place molten steel of the LF is 0.049 percent. 4442kg of lime and 346kg of modified preparation are added in the LF smelting refining process, the mixture is heated for 33 minutes, the manganese content is 0.0146% when the mixture is off-site, and the specific parameters are shown in the following table 1.
Example 3
The molten iron with the manganese content of 0.457 percent is used as a raw material, smelting is carried out by a converter double-slag method smelting process, steel is tapped at low temperature in a converter link, a better thermodynamic condition is created for further demanganization, the in-place temperature of an LF (ladle furnace) is 1549 ℃, and the Mn content in the in-place molten steel of the LF is 0.053 percent. 3878kg of lime and 286kg of the modified preparation are added in the LF smelting and refining process, the mixture is heated for 26 minutes, the manganese content is 0.0136 percent when the mixture is off-site, and the specific parameters are shown in the following table 1.
In the above three embodiments, the manganese content of the molten iron fed into the converter exceeds 0.40%, and the manganese content still cannot be reduced to below 0.05% after demanganization of the converter. After further demanganization in the LF furnace, the manganese content of the molten steel is further reduced to finally reach the smelting standard, the manganese content is lower than 0.02 percent, and the specific process parameters and the process effects are shown in the following table 1. The method for smelting the ultra-low manganese steel by the high manganese molten iron can stably reduce the manganese content of the molten steel in the in-position of the continuous casting machine to be below 0.02 percent under the condition that the molten iron entering the furnace is the high manganese molten iron with the manganese content higher than 0.40 percent.
TABLE 1
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A method for smelting ultra-low manganese steel by using high-manganese molten iron is characterized by comprising the following steps:
s1 smelting process of converter adopting double slags
Adopting a double-slag method operation in the converter treatment process, and deslagging when the oxidation of manganese and silicon in steel is basically finished and the oxidation of carbon is gradually changed from being inhibited to beginning a violent oxidation period; slag charge and iron shot are added in the slagging process, and the manganese return phenomenon in the later stage of converter blowing is effectively inhibited by a control method of large slag quantity, end point temperature and end point oxygen in the slagging process; the manganese content in the molten iron fed into the converter is higher than 0.40 percent;
s2 Process for deep demanganization by converter low-temperature tapping and LF refining furnace
Wherein the temperature of low-temperature tapping of the converter is as follows: 1560-1690 ℃;
the deep demanganization of the LF refining furnace comprises two slagging processes: primary slagging and secondary slagging;
in step S1, deslagging is carried out when blowing is started for 4 min;
in the step S1, the adding amount of slag charge is 15-20t, the adding amount of iron sheet balls is 5-20t, the end point temperature is controlled to be 1560-1690 ℃, the end point oxygen is controlled to be 950-1050 ppm, the manganese return phenomenon in the later stage of converter blowing is effectively inhibited, and the manganese content in molten steel is reduced to be below 0.06% when the converter taps;
in the step S2, the in-place temperature of the LF refining furnace for primary slagging is 1520-1560 ℃; the addition amount of the slag former is 8-12 kg per ton of steel, and the refining heating temperature is 1590-1610 ℃; heating the steel ladle at the refining temperature to 1590-1610 ℃, and blowing argon gas from the bottom of the steel ladle to stir and demanganize the steel ladle;
the in-place temperature of the LF refining furnace for secondary slagging is 1520-1560 ℃; the addition amount of the slag former is 4-6 kg per ton of steel, and the refining heating temperature is 1590-1610 ℃; heating the steel ladle at the refining temperature to 1590-1610 ℃, and blowing argon gas from the bottom of the steel ladle to stir and demanganize the steel ladle;
the slagging agent for the first slagging and the second slagging is a mixture of lime and a modifier, wherein the ratio of the lime to the modifier is 9-12: 0.8-1.5.
2. The method according to claim 1, wherein the argon gas introducing amount of the first-time slagging and the second-time slagging ladle bottom blowing argon gas stirring demanganization is 1200L/min, and the argon gas introducing time is 6-10 min.
3. The method of claim 1, wherein the LF refining furnace is subjected to slagging-off treatment after the first slagging is finished.
4. The method of any one of claims 1 to 3, wherein the manganese content of the molten steel in the position of the continuous casting machine is stably reduced to below 0.02% by deep demanganization of the LF refining furnace.
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| CN111440916B (en) * | 2020-04-30 | 2021-11-30 | 包头钢铁（集团）有限责任公司 | Method for producing ultra-low manganese steel by using high-manganese molten iron converter |
| CN112342455A (en) * | 2020-10-28 | 2021-02-09 | 湖南华菱湘潭钢铁有限公司 | Smelting method of industrial pure iron |
| CN115247222B (en) * | 2021-04-28 | 2023-11-24 | 河北龙凤山铸业有限公司 | Control method for preparing 4N-grade high-purity iron ultralow manganese through fire purification |
| CN114292981A (en) * | 2021-11-12 | 2022-04-08 | 安阳钢铁股份有限公司 | Method for smelting high-temperature low-manganese steel in later-stage converter campaign |
| CN114807507A (en) * | 2022-05-25 | 2022-07-29 | 湖南华菱湘潭钢铁有限公司 | Production method of ultralow-manganese steel |
| CN115369205B (en) * | 2022-08-30 | 2023-08-18 | 鞍钢股份有限公司 | Converting method of low manganese steel converter |
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