CN113005258B - Accident alloy disposal method - Google Patents
Accident alloy disposal method Download PDFInfo
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- CN113005258B CN113005258B CN202110205435.XA CN202110205435A CN113005258B CN 113005258 B CN113005258 B CN 113005258B CN 202110205435 A CN202110205435 A CN 202110205435A CN 113005258 B CN113005258 B CN 113005258B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
Abstract
A disposal method of accident alloy, belonging to the field of steel smelting. A method of handling accident alloys, comprising the steps of: s1, converter steelmaking; s2, converter tapping: before alloying operation, accident alloy and deoxidant are added to deoxidize until the steel output is complete, at least part of the accident alloy is deoxidized into oxide and exists in steel slag, and the oxide includes manganese dioxide. The lower limit of Mn contained in the steel grade is matched with a manganese source to perform alloying operation, the accident alloy is added with Si-Mn alloy containing Mn not more than 0.05 percent of the mass percent of the molten steel in the accident alloy, and the deoxidizer does not contain Si-Mn alloy. S3, refining in an LF furnace. Therefore, under the premise of not sorting the silicomanganese alloy and the ferrosilicon alloy in the accident alloy, the ferrosilicon alloy is directly added into molten steel, so that the deoxidization is effective, Mn is effectively added as a matched component, the component qualified accident is not caused, the utilization rate of the accident alloy is effectively improved, and the resource waste is prevented.
Description
Technical Field
The application relates to the field of steel smelting, in particular to a disposal method of accident alloy.
Background
Alloy that can not normally use or alloy that pulverizes in the transportation because of reasons such as equipment trouble are called accident alloy collectively, and accident alloy is mainly with ferrosilicon alloy and silicomanganese alloy, because of accident alloy is silicomanganese, ferrosilicon mixed alloy, and the composition is uncontrollable, in order to avoid composition out of the shelf accident, therefore accident alloy can not use as the joining component of steel grade, need the manual work to separate silicomanganese alloy, ferrosilicon alloy, and the work load is big, and the alloy letter sorting degree of difficulty of pulverization is very big. And the sorted silicon-manganese alloy is generally used for removing steel slag after converter tapping deoxidation, cannot play a role in adding components, and causes resource waste.
Disclosure of Invention
The present application provides a disposal method of accident alloy, which can solve at least one of the problems described above.
The embodiment of the application is realized as follows:
a method of handling accident alloys, comprising the steps of:
and S1, converter steelmaking.
S2, converter tapping: during the tapping process, before the molten steel is alloyed according to the proportion of steel grades, accident alloy and deoxidizing agent are added for deoxidizing, and after the tapping amount is complete, at least part of the accident alloy is deoxidized into oxide and exists in the steel slag, and the oxide comprises manganese dioxide.
The lower limit of Mn contained in the steel grade is matched with a manganese source to perform alloying operation, the accident alloy is added with Si-Mn alloy containing Mn not more than 0.05 percent of the mass percent of the molten steel in the accident alloy, and the deoxidizer does not contain Si-Mn alloy.
S3, refining in an LF furnace: so that manganese dioxide in the steel slag is reduced into a manganese simple substance and is melted in the molten steel.
Under the above conditions, the accident alloy and the deoxidizer are added before the alloying operation, so that the deoxidation is completed before the alloying operation, and the influence on the normal alloying operation is avoided.
The normal trend is that the more accident sums are, the higher the Mn content in the molten steel is, but the specific component content in the molten steel is required to be a range value, the deviation range of the specific Mn content is +/-0.05%, therefore, if the accident alloy is adopted for deoxidation, on one hand, the cost is higher, on the other hand, the Mn component proportion possibly exceeds the Mn content requirement in the molten steel, therefore, the deoxidizers of the accident alloy and the non-silicon manganese alloy are selected for deoxidation together in the actual deoxidation process, meanwhile, in order to further prevent the Mn component proportion possibly exceeding the Mn content requirement in the molten steel, the lower limit (X) of the Mn component proportion contained in the steel is matched with a manganese source for alloying operation, the accident alloy is added with the Mn content in the silicon-manganese alloy which is not more than 0.05% of the mass percent of the molten steel, and at the moment, the Mn content added into the molten steel finally provided by the accident alloy is always less than the upper limit of the Mn component requirement in the steel, the component proportion of the steel grade is not influenced.
In summary, by using the handling method of the accident alloy, under the premise of not sorting the silicomanganese alloy and the ferrosilicon alloy in the accident alloy, the alloy is directly added into molten steel, so that not only is the deoxidation effective, but also Mn is effectively added as a matched component, and the component qualified accident is not caused, the utilization rate of the accident alloy is effectively improved, and the resource waste is prevented.
Detailed Description
Embodiments of the present application will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present application and should not be construed as limiting the scope of the present application. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The application provides a disposal method of accident alloy, which comprises the following steps:
and S1, carrying out converter steelmaking, wherein the molten steel mainly comprises iron.
S2, converter tapping: molten steel is made to enter the ladle while alloying is performed.
Specifically, step S2 includes:
s2.1, deoxidizing.
Although the accident alloy can be deoxidized, if the accident alloy is completely deoxidized, the carbon-oxygen product is 0.0025% at the molten steel equilibrium state at 1600 ℃, pre-deoxidation is required to be performed when the carbon content is below 0.08% at the converter end point, at this time, the carbon content is 0.08%, the calculated oxygen content is 0.0025%/0.08%/0.03125%, and the calculated oxygen content is 120 × 1000 × 0.0313%/37.5 Kg, then 128Kg of Mn is theoretically required to be added to completely deoxidize the molten steel, and more Mn is actually required, so that the accident alloy is added as much as possible to complete the deoxidation, and if the accident alloy is completely used as a matched component, the component is easy to be produced, and the cost is high.
Therefore, in the embodiment of the present invention, the accident alloy and the deoxidizer are added to perform deoxidation together, and since the manganese dioxide in the steel slag can be reduced and then added to the molten steel in the subsequent step S3, the deoxidizer does not include the silicon-manganese alloy in order to avoid the interference of the components.
Specifically, the accident alloy is mainly a mixture of a silicon-manganese alloy and a silicon-iron alloy, both of which can be deoxidized, and because the deoxidizing property of the silicon-iron alloy is stronger than that of the silicon-manganese alloy, after the accident alloy is added into a ladle, the silicon-iron alloy is firstly deoxidized to completely consume the silicon-iron alloy, so that iron oxide and silicon dioxide obtained by the accident alloy are present in steel slag floating on the surface of molten steel, and then the silicon-manganese alloy is utilized for deoxidation, and the reaction generated in the silicon-manganese alloy deoxidizing stage is mainly as follows:
1、Si+2[O]＝(SiO2)；2、Mn+[O](MnO). Wherein]Indicates that the component is present in molten steel, and (ii) indicates that the component is present in steel slag. That is, manganese dioxide and silicon dioxide obtained by deoxidizing the silicon-manganese alloy are also present in the steel slag floating on the surface of the molten steel, but the excessive silicon-manganese alloy participates in the alloying reaction in the subsequent step S2.2.
Because the specific value of Mn component contained in the actual steel grade has the allowable deviation range value, generally X plus or minus 0.05% (X is more than 0.05), the accident alloy is added with the Mn content in the silicon-manganese alloy contained in the accident alloy being not more than 0.05% of the mass percent of the molten steel, and meanwhile, in the subsequent S2.2 step, the alloying operation is carried out by adding a manganese source with the lower limit of Mn contained in the steel grade, so that the manganese content added into the molten steel finally provided by the accident alloy is certainly less than the upper limit required by the manganese component in the steel grade, and the component proportion of the steel grade is not influenced.
In the actual operation process, the operation of obtaining the specific content of the silicon-manganese alloy contained in the accident alloy is difficult and complicated, so optionally, in step S2, on the premise that the specific content of the silicon-manganese alloy contained in the accident alloy is not clear, all the accident alloys are preset to be the silicon-manganese alloy, and at this time, the accident alloy is added with the content of Mn in the silicon-manganese alloy contained in the preset accident alloy being not more than 0.05% of the mass percentage of the molten steel.
Wherein, when the accident alloy is added according to the predetermined accident alloy in which the Mn content is not more than 0.05% by mass of the molten steel, the inventors have found that, when the amount of the accident alloy added in each ton of molten steel is not more than 0.5kg, the accident alloy basically only participates in the oxidation reaction, at the moment, all Mn corresponding to the accident alloy exists in the steel slag in the form of manganese dioxide, when the amount of the accident alloy added per ton of molten steel is more than 0.5kg, the accident alloy is excessive in the deoxidation step, and Mn corresponding to the accident alloy only participating in the deoxidation step exists in the steel slag in the form of manganese dioxide, excessive part of the accident alloy enters the subsequent alloying operation and Mn contained in the accident alloy enters molten steel, although the total Mn content in the steel does not exceed the upper limit requirement, the production cost is high, and excessive part of accident alloy can influence the alloying operation.
Thus, alternatively, the amount of incident alloy added per ton of molten steel does not exceed 0.5 kg. At the moment, the accident alloy can only be deoxidized without participating in the subsequent alloying step, so that the production cost is reduced as much as possible. Meanwhile, at the moment, the maximum Mn content is increased by 0.03 percent, and the Mn content range is not exceeded.
Optionally, the deoxidizer comprises at least one of a carbon powder and an aluminum deoxidizer. The aluminum deoxidizer includes, but is not limited to, molten aluminum, aluminum-iron alloy, etc., and is not limited thereto, and may be selected by those skilled in the art according to actual needs.
Optionally, the deoxidizer is carbon powder. The carbon powder is adopted as the deoxidizer, and besides the low price and the low cost, the more important is that the carbon powder is added into a ladle to react with oxygen to produce CO gas, so that the turning of molten steel is accelerated, the deoxidation efficiency and speed of the accident alloy are increased, and the carbon powder can be deoxidized, so that the higher the oxygen content is, the more the needed deoxidation accident alloy is, the longer the needed deoxidation time is, and the higher the carbon powder adding amount is.
Specifically, when the carbon oxygen product is 0.0025 in the state of equilibrium of molten steel at 1600 ℃ (oxygen converter steelmaking process and facility, Zhang Yan rock, etc., P148.3.6), deoxidation is required when the carbon content at the end of the converter is 0.08% or less in terms of conversion.
In order to improve the utilization rate of the deoxidizer and the accident alloy and simultaneously avoid unnecessary waste of the deoxidizer and the accident alloy so as to reduce the production cost, the deoxidizer and the accident alloy should be reasonably added according to different end-point carbon content ranges.
Alternatively, in some embodiments of the present application, when the carbon content at the end point of the converter is 0.06% ≦ 0.08%, 0.2kg to 0.3kg of carbon powder, specifically, for example, 0.2kg, 0.23kg, 0.25kg, 0.27kg, or 0.3kg of carbon powder, and 0.2kg to 0.3kg of accident alloy, specifically, for example, 0.2kg, 0.23kg, 0.25kg, 0.27kg, or 0.3kg of accident alloy, are added per ton of molten steel.
When the carbon content at the end of the converter is 0.04% or more and less than 0.06%, 0.33kg to 0.42kg of carbon powder, specifically, 0.33kg, 0.35kg, 0.37kg, 0.4kg, or 0.42kg of carbon powder, and 0.37kg to 0.45kg of the alloy for accidents, specifically, 0.37kg, 0.38kg, 0.4kg, 0.43kg, or 0.45kg of the alloy for accidents are added to each ton of molten steel.
When the end point carbon content of the converter is less than 0.04%, 0.45kg to 0.5kg of carbon powder, for example, 0.45kg, 0.46kg, 0.47kg, 0.48kg or 0.5kg of carbon powder, and 0.45kg to 0.5kg of accident alloy, for example, 0.45kg, 0.46kg, 0.47kg, 0.48kg or 0.5kg of accident alloy are added to each ton of molten steel.
The addition amounts of the carbon powder and the emergency alloy may be limited not only by the carbon content at the end of the converter, but also by directly measuring the oxygen content and limiting the oxygen content by adding an appropriate emergency alloy and a deoxidizing agent to perform deoxidation.
S2.2 alloying operation.
The alloying operation is carried out by adding other nonferrous sources, such as manganese source, etc., according to the mixture ratio of the steel grade.
Wherein, the lower limit of Mn contained in the steel grade is matched with a manganese source to carry out alloying operation.
Optionally, the alloying operation is performed when the steel amount reaches 25% to 34%, for example 25%, 27%, 30%, 33%, or 34% by weight, and the alloying operation is performed at a proper timing and for a sufficient time to sufficiently alloy.
Under the conditions, if the accident alloy is put into the ladle too early, the accident alloy can be stuck to the bottom of the ladle and is difficult to melt in the molten steel, and the accident alloy contains a small amount of moisture, so that safety accidents such as large turnover of the molten steel can be caused. If the input time is too late, normal alloying operation is affected, and deoxidation needs a certain time in a process, so that optionally, in step S2.1, the accident alloy and the deoxidizer are added when the tapping amount reaches 15 to 22 percent, specifically, 15, 17, 18, 20, 21 or 22 percent by weight, and the reasonability of the input time of the accident alloy and the deoxidizer is ensured.
In summary, tapping the converter to completion ensures that at least some of the incidental alloy is deoxidized to an oxide and is present in the steel slag, the oxide comprising manganese dioxide.
S3, refining in an LF furnace: so that manganese dioxide in the steel slag is reduced into a manganese simple substance and is melted in the molten steel.
The normal LF process is used for removing S in molten steel, and the S removal is carried out by using lime in steel slag, but the oxygen in the steel slag needs to be removed, and the means is to add high-aluminum slag (containing 30% of aluminum). Therefore, MnO can be directly reduced into Mn, and the manganese dioxide in the steel slag can be reduced into a manganese simple substance and melted in molten steel only by normal LF furnace refining without additional operation.
That is, the steel grade suitable for the method of the present application is a steel grade suitable for refining in an LF furnace. The manganese dioxide can be reduced into a manganese simple substance by utilizing the refining reducing atmosphere of the LF furnace and is melted in the molten steel.
At this time, iron oxide can be reduced into iron simple substance by using the reducing atmosphere refined by the LF furnace and melted in the molten steel. However, since molten steel is mainly a carbon steel alloy, and generally, the iron content in molten steel is more than 98%, the reduced iron provided by the accident alloy within the addition range defined in the present application is very small in the whole amount, and the influence on the iron content is negligible. And compared with manganese oxide, silicon oxide is difficult to reduce, so that the composition is effectively prevented from being qualified.
Specifically, in step S3, lime and high alumina slag are added, and bottom-blown argon gas is introduced for stirring, wherein the argon gas flow rate is controlled to be 30Nm3/h～60Nm3H is used as the reference value. At this point the following reaction occurs: (MnO) +2Al ═ Al (Al)2O3)+3[Mn]That is, the lime on the surface of the molten steel is in a molten state and has adsorbability, Al2O3The argon gas is blown from the bottom to float to the surface of the molten steel and is absorbed in the steel slag by lime.
In order to avoid resource waste, in the actual use process, it is required to determine whether MnO in the steel slag is completely reduced or not, the MnO in the steel slag is generally not required to be checked and only needs to be judged according to the color of the steel slag on the surface, and therefore, the reduction can be completed when the steel slag is stirred to be changed from black to white. The principle is as follows: the steel slag is composed of various oxides and added lime, wherein the oxides are black, the lime is white, the steel slag is black when the oxides are more, the steel slag is yellow and white when the lime is more, and the steel slag is white when the lime is all.
Optionally, in step S3, 3.75kg to 4.59kg lime and 2.25kg to 2.75kg high alumina slag are added to each ton of molten steel. Specifically, for example, 3.75kg, 3.85kg, 3.9kg, 4kg, 4.3kg, 4.5kg, or 4.59kg of lime, 2.25kg, 2.3, 2.35, 2.5, 2.6, 2.7, or 2.75kg of high alumina slag, or the like is added per ton of molten steel.
The handling method of the accident alloy of the present application is further described in detail with reference to the following examples.
Example 1
A120 t converter is adopted for steel grade: HRB400E-02, and the preparation route of HRB400E-02 is converter-LF furnace-billet caster.
Wherein, the C, Si and Mn in the HRB400E-02 steel grade have the following component proportion requirements in percentage by mass: c: 0.22-0.24%, Si: 0.27 to 0.37%, Mn: 1.3 to 1.4 percent. In the actual adding process, the specific content deviation range of Mn is +/-0.05%, and the lower limit of the Mn ratio is 1.3 +/-0.05%.
A method of handling accident alloys, comprising the steps of:
s1, converter steelmaking, wherein molten steel obtained by smelting is sampled and subjected to component analysis, and the components in the molten steel are as follows according to mass percentage: 0.219%, Si: 0%, Mn: 0.123 percent. And (3) analyzing the temperature of the molten steel obtained by smelting, wherein the temperature is 1542 ℃.
S2, converter tapping: since the temperature did not satisfy the tapping requirement, the carbon content at the end point of the converter was estimated to be C: 0.04% and 1/6% of the weight of the steel, 60kg of carbon powder and 60kg of accident alloy were manually charged into the ladle to deoxidize the steel.
When the steel weight reaches 1/4, 2284.593Kg of silicon-manganese alloy and 127.199 Kg of silicon-iron alloy are added (the Mn content in the silicon-manganese alloy is 65 percent, the yield of Mn is 95 percent, the silicon-manganese increasing is 0.95 x 0.65 x 2284.593/120000 to 1.1756 percent, the residual Mn in molten steel is 0.123 percent, the total Mn in the molten steel is 1.1756+0.123 to 1.2986 percent, which is just the lower limit of the standard requirement).
S3, refining in an LF furnace: adding 500kg of lime and 300kg of high-alumina slag into an LF furnace, simultaneously introducing bottom blowing Ar gas for stirring, and controlling the flow to be 30-60 Nm3And/h, stirring for 5 minutes, taking steel slag on the surface of the molten steel as a sample, converting the steel slag from black to white, indicating that the deoxidation is complete at the moment, reducing MnO into Mn to enter the molten steel at the moment, taking the molten steel for component measurement, wherein the components in the molten steel are C: 0.1898%, Si: 0.33%, Mn: 1.343 percent.
That is, the Si and Mn are required in the component proportion of the steel grade HRB 400E-02.
Example 2
A120 t converter is adopted for steel grade: preparation of Q345C.
Wherein, the C, Si and Mn are required to be in the steel grade Q345C according to the mass percentage: c: 0.14 to 0.18%, Si: 0.15-0.30%, Mn: 1.4 to 1.5 percent.
A method of handling accident alloys, comprising the steps of:
s1, converter steelmaking, wherein molten steel obtained by smelting is sampled and subjected to component analysis, and the components in the molten steel are as follows according to mass percentage: 0.11%, Si: 0%, Mn: 0.16 percent. And (3) analyzing the temperature of the molten steel obtained by smelting, wherein the temperature is 1583 ℃.
S2, converter tapping: since the temperature did not satisfy the tapping requirement, the carbon content at the end point of the converter was estimated to be C, when the decarburization rate was calculated at 0.01% (mass percentage) per 4.5 seconds, in the ladle from tapping to 120t among the ladles from tapping to 120t after the oxygen blowing for 28 seconds: 0.05%, when the amount of steel was 1/6% of the weight of the steel, 45kg of carbon powder and 50kg of the accident alloy were manually charged into the ladle to deoxidize the steel.
When the steel weight reaches 1/4, 2380.631Kg of silicon-manganese alloy is added (the Mn content in the silicon-manganese alloy is 65 percent, the yield of Mn is 95 percent, the silicon-manganese content is 0.95 x 0.65 x 2380.631/120000 is 1.225 percent, the residual Mn in molten steel is added to 0.16 percent, the total Mn in the molten steel is 1.225 percent and 0.16 percent is 1.385 percent, and the lower limit of the standard requirement is just added).
S3, refining in an LF furnace: adding 500kg of lime and 300kg of high-alumina slag into an LF furnace, simultaneously introducing bottom blowing Ar gas for stirring, and controlling the flow to be 30-60 Nm3And/h, stirring for 5 minutes, taking steel slag on the surface of the molten steel as a sample, converting the steel slag from black to white, indicating that the deoxidation is complete at the moment, reducing MnO into Mn to enter the molten steel at the moment, taking the molten steel for component measurement, wherein the components in the molten steel are C: 0.1388%, Si: 0.22%, Mn: 1.41 percent.
That is, the composition ratio of Si and Mn in the steel grade Q345C is required.
Example 3
A120 t converter is adopted for steel grade: preparation of Q235B, and a preparation route of Q235B is converter-LF furnace-billet caster.
Wherein, the C, Si and Mn are required to be in the steel grade Q235B according to the mass percentage: c: 0.14 to 0.16%, Si: 0.10 to 0.21%, Mn: 0.4 to 0.5 percent.
A method of handling accident alloys, comprising the steps of:
s1, converter steelmaking, wherein molten steel obtained by smelting is sampled and subjected to component analysis, and the components in the molten steel are as follows according to mass percentage: 0.069%, Si: 0%, Mn: 0.15 percent. And analyzing the temperature of the molten steel obtained by smelting, wherein the temperature is 1605 ℃.
S2, converter tapping: the end-point carbon content of the converter is C: 0.069%, when the steel amount reaches 1/6% of the weight, 30kg of carbon powder and 30kg of accident alloy are manually thrown into the ladle for deoxidation.
When the steel weight reaches 1/4, 490.256kg of silicomanganese alloy and 273.316 kg of ferrosilicon alloy are added (the Mn content in the silicomanganese alloy is 65 percent, the yield of Mn is 95 percent, the silicomanganese is increased by 0.95 x 0.65 x 490.256/120000 to 0.252 percent, the residual Mn in molten steel is added by 0.15 percent, the total Mn in the molten steel is 0.252 percent and 0.15 percent to 0.401 percent, and the addition is just the addition of the lower limit of the standard requirement).
S3, refining in an LF furnace: adding 500kg of lime and 300kg of high-alumina slag into an LF furnace, simultaneously introducing bottom blowing Ar gas for stirring, and controlling the flow to be 30-60 Nm3And/h, stirring for 5 minutes, taking steel slag on the surface of the molten steel as a sample, converting the steel slag from black to white, indicating that the deoxidation is complete at the moment, reducing MnO into Mn to enter the molten steel at the moment, taking the molten steel for component measurement, wherein the components in the molten steel are C: 0.145%, Si: 0.14%, Mn: 0.413 percent.
That is, the composition ratio of Si and Mn in the steel type Q235B is required.
Example 4
A120 t converter is adopted for steel grade: the preparation of SWRCH6A-LF and the preparation route of SWRCH6A-LF are a converter-LF furnace and a billet caster.
Wherein, the C, Si and Mn in steel SWRCH6A-LF have the following component proportion requirements in percentage by mass: c: 0.04-006%, Si: 0.00-0.08%, Mn: 0.2 to 0.35 percent.
A method of handling accident alloys, comprising the steps of:
s1, converter steelmaking, wherein molten steel obtained by smelting is sampled and subjected to component analysis, and the components in the molten steel are as follows according to mass percentage: 0.017%, Si: 0%, Mn: 0.103 percent. . And analyzing the temperature of the molten steel obtained by smelting at 1625 ℃.
S2, converter tapping: the end-point carbon content of the converter is C: 0.017%, when the steel is tapped to 1/6% of the weight, 60kg of carbon powder and 60kg of accident alloy are manually thrown into the ladle for deoxidation.
When the steel weight reaches 1/4, 201.3kg of silicon-manganese alloy is added (the Mn content in the silicon-manganese alloy is 65%, the yield of Mn is 95%, the silicon-manganese increase is 0.95 x 0.65 x 201.3/120000 to 0.1036%, the residual Mn in molten steel is 0.103%, the total Mn in the molten steel is 0.1036% and 0.103% to 0.2066%, and the addition is just the lower limit of the standard requirement).
S3, refining in an LF furnace: adding 500kg of lime and 300kg of high-alumina slag into an LF furnace, simultaneously introducing bottom blowing Ar gas for stirring, and controlling the flow to be 30-60 Nm3And/h, stirring for 5 minutes, taking steel slag on the surface of the molten steel as a sample, converting the steel slag from black to white, indicating that the deoxidation is complete at the moment, reducing MnO into Mn to enter the molten steel at the moment, taking the molten steel for component measurement, wherein the components in the molten steel are C: 0.0412%, Si: 0.02%, Mn: 0.2167 percent.
That is, the composition proportion of Si and Mn in the steel type SWRCH6A-LF is required.
In conclusion, according to the handling method for the accident alloy, the silicon-manganese alloy and the silicon-iron alloy in the accident alloy are not sorted, and are directly added into molten steel, so that not only is effective deoxidation realized, but also Mn is effectively added as a matched component, and the component qualified accident is not caused, the utilization rate of the accident alloy is effectively improved, and the resource waste is prevented.
The foregoing is merely exemplary of the present application and is not intended to limit the present application, which may be modified or varied by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (12)
1. A method of handling accident alloys, comprising the steps of:
s1, converter steelmaking;
s2, converter tapping: before alloying the molten steel according to the proportion of steel grades in the tapping process, adding an accident alloy and a deoxidizing agent for deoxidizing, and after the tapping amount is complete, deoxidizing at least part of the accident alloy into an oxide and storing the oxide in the steel slag, wherein the oxide comprises manganese dioxide;
adding a manganese source to the lower limit of Mn contained in the steel for alloying, adding the accident alloy with the Mn content in the silicon-manganese alloy contained in the accident alloy not more than 0.05 percent of the mass percent of the molten steel, wherein the deoxidizer does not contain the silicon-manganese alloy;
s3, refining in an LF furnace: reducing manganese dioxide in the steel slag into a manganese simple substance and melting the manganese simple substance in the molten steel;
the accident alloy mainly comprises a mixture of a silicon-iron alloy and a silicon-manganese alloy.
2. The method for handling a mishaped alloy according to claim 1, wherein in step S2, all the mishaped alloys are preset to be a silicomanganese alloy on the premise that the specific content of the silicomanganese alloy contained in the mishaped alloy is not clear, and the mishaped alloy is added so that the content of Mn contained in the mishaped alloy is not more than 0.05% by mass of the molten steel.
3. A method of handling accident alloy according to claim 2, wherein the accident alloy is added in an amount of no more than 0.5kg per tonne of molten steel.
4. A method as claimed in any one of claims 1 to 3 wherein the deoxidizer includes at least one of a carbon powder and an aluminium deoxidizer.
5. A method as claimed in any one of claims 1 to 3 wherein the deoxidant is carbon powder.
6. The method for handling accident alloy according to claim 5, wherein in step S2, when the carbon content at the end of converter is 0.06% ≦ 0.08%, 0.2 kg-0.3 kg of carbon powder and 0.2 kg-0.3 kg of accident alloy are added per ton of molten steel.
7. The method for handling accident alloy according to claim 5, wherein in step S2, when the carbon content at the converter end point is 0.04% or more and less than 0.06%, 0.33kg to 0.42kg of carbon powder and 0.37kg to 0.45kg of accident alloy are added per ton of molten steel.
8. The method for handling accident alloy according to claim 5, wherein in step S2, when the converter end point carbon content is less than 0.04%, 0.45kg to 0.5kg of carbon powder and 0.45kg to 0.5kg of accident alloy are added per ton of molten steel.
9. The accident alloy disposing method according to claim 1, wherein in the step S2, the alloying operation is performed when the steel tapping amount reaches 25% to 33.3% by weight.
10. The method of claim 1, wherein the accident alloy and the deoxidizer are added when the steel output reaches 15 to 22% by weight in step S2.
11. The method for handling accident alloy according to claim 1, wherein in step S3, lime and high alumina slag are added, and bottom-blown argon stirring is started, and the argon flow is controlled to be 30Nm3/h ~60Nm3And h, stirring until the steel slag turns white from black.
12. The method for handling accident alloy according to claim 11, wherein 3.75kg to 4.59kg of lime and 2.25kg to 2.75kg of high alumina slag are added to each ton of the molten steel in step S3.
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