CN115247225A - Method for smelting UNS N06600 steel by using intermediate frequency furnace - Google Patents
Method for smelting UNS N06600 steel by using intermediate frequency furnace Download PDFInfo
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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Abstract
The invention provides a method for smelting UNS N06600 steel in an intermediate frequency furnace, and belongs to the technical field of intermediate frequency furnace smelting. The method comprises the steps of material preparation, bottom slag adding and melting, precipitation deoxidation, slag skimming to make new slag, alloying, first diffusion desalination, second diffusion deoxidation and tapping(ii) a By controlling CaO and CaF in the bottom slag 2 The proportion can help melt lime without corroding the furnace lining; the invention also adds Al as the slag charge component in the slagging process 2 O 3 The pre-melted slag of CaO removes sulfur and phosphorus in the initial acid slag in the furnace, so that the corrosion of the initial acid slag on the furnace lining is reduced; the method also reduces the oxygen and hydrogen contents and the non-metal slag inclusion contents of the UNS N06600 steel, improves the corrosion resistance of the UNS N06600 steel, reduces the corrosion of slag to a furnace lining, improves the smelting furnace life and reduces the production cost.
Description
Technical Field
The invention relates to the technical field of intermediate frequency furnace smelting, in particular to a method for smelting UNS N06600 steel in an intermediate frequency furnace.
Background
The UNS N06600 alloy is a nickel-chromium alloy and can be used in a temperature range from a low temperature to 1093 ℃. The Inconel600 (N06600) nickel-based high-temperature alloy has no magnetism and good welding performance. Under wide corrosion environments, the high nickel content enables the N06600 alloy to have certain corrosion resistance to a reducing environment, and meanwhile, the addition of the chromium enables the N06600 alloy to have certain corrosion resistance to a weak oxidizing environment. Due to the rather high nickel content, the N06600 alloy has excellent corrosion resistance to chloride ion stress corrosion cracking.
The working frequency of the medium frequency induction melting furnace is between 50Hz and 10kHz, and frequency modulation is needed by a frequency converter. The medium-frequency induction smelting furnace has the advantages of high electrical efficiency and thermal efficiency, short smelting time, less power consumption, less occupied land, lower investment, flexible production, easy implementation of process automation and the like, and is widely adopted in the steel smelting industry, but the technical problem of short service life of the smelting furnace caused by serious corrosion of furnace slag to a furnace lining when the medium-frequency furnace is adopted for smelting N06600 steel exists.
Disclosure of Invention
The invention aims to provide a method for smelting UNS N06600 steel in an intermediate frequency furnace, which can reduce the corrosion of slag to a furnace lining.
In order to solve the above problems, the present invention adopts the following technical solutions.
A method for smelting UNS N06600 steel by an intermediate frequency furnace comprises the following steps:
s1, preparing materials: in an intermediate frequency furnace, preparing molten steel according to the following ingredients in parts by mass, wherein the molten steel contains 0.08% of C, 0.15% of Si, 0.5% of Mn, 0.02% of P, 0.01% of S, 15.89% of Cr, 74.5% of Ni, 8.5% of Fe, 0.10% of Al and 0.25% of Ti; and lime is used for bottoming when preparing molten steel.
In the step, certain amount of Al and C are added into the mixture to facilitate deoxidation, and Si and Mn are added into the mixture to deoxidize and prevent oxygen supersaturation.
S2, adding bottom slag and melting: after the step S1 is finished, adding bottom slag into the intermediate frequency furnace and melting, wherein the bottom slag is prepared from CaO and CaF 2 Composition, and CaO and CaF in the bottom slag 2 The mass ratio of (1) to (2);
adding CaO and CaF in the step 2 The purpose of the bottom slag is to remove S and preventThe molten steel is prevented from being directly contacted with the atmosphere and oxidized, so that the heat loss in the smelting process is reduced, and the energy utilization rate is improved; by controlling CaO and CaF 2 The proportion is 8:2, lime can be fluxed without corroding the furnace lining.
S3, precipitation and deoxidation: after the molten steel prepared in the step S2 is melted down, adding Si-Ca lines into a medium frequency furnace for precipitation and deoxidation;
this step contributes to the reduction of the oxygen content in the molten steel by precipitation deoxidation by adding Si-Ca wires.
S4, slagging off and new slag making: after the precipitation and deoxidation in the step S3 are finished, slagging off is carried out, and Al serving as a slag charge component is added into the intermediate frequency furnace 2 O 3 And CaO pre-melting slag to make new slag;
the slag component in the step is Al 2 O 3 And removing sulfur and phosphorus in initial acid slag in the furnace by using the pre-melted slag of CaO so as to reduce the corrosion of the initial acid slag on a furnace lining.
S5, alloying: after the new slag is manufactured in the step S4, adding chromium metal into the slag for alloying;
this step contributes to the oxidation and corrosion resistance of UNS N06600 steel by adding metallic chromium to the slag.
S6, first diffusion deoxidation: after the step S5 is finished, adding Al blocks and Al-CaO into the slag to perform first diffusion deoxidation;
in the step, a part of oxygen in the slag is removed firstly through first diffusion deoxidation.
S7, second diffusion deoxidation: after the step S6 is finished, sampling and analyzing stokehole components, adding a deoxidizer into the furnace slag in batches, and then carrying out secondary diffusion deoxidation;
in the step, the components in front of the furnace are analyzed, other elements can be added into the slag according to the analysis result to adjust the element proportion of the slag, and then the secondary diffusion deoxidation is carried out to further remove FeO in the slag.
S8, tapping: and (5) after the step (S7) is finished, adjusting the amount of the slag, keeping the white slag for a certain time, and then tapping to obtain UNS N06600 steel.
Compared with the prior art, the inventionBy controlling CaO and CaF in the bottom slag 2 The proportion can help melt lime without corroding the furnace lining; the invention also adds Al as the slag charge component in the slagging process 2 O 3 And the pre-melted slag of CaO removes sulfur and phosphorus in the initial acid slag in the furnace, thereby reducing the corrosion of the initial acid slag on the furnace lining. The intermediate frequency furnace has the advantages of high smelting speed, good electricity-saving effect, less burning loss and low energy consumption, and improves the smelting efficiency; the multiple diffusion deoxidation enables the internal structure of the steel ingot to be more compact, the purity is high, the sulfur content is low, the non-metallic inclusions are few, the surface of the steel ingot is smooth, clean, uniform and compact, the metallographic structure and the chemical components are uniform, the oxygen and hydrogen content and the non-metallic slag inclusion content of UNS N06600 steel can be reduced, the corrosion resistance of the UNS N06600 steel is improved, the corrosion of furnace slag to a furnace lining is reduced, the smelting furnace life is prolonged, and the production cost is reduced.
Further, in step S2, the weight of the bottom slag is 1% of the weight of the molten steel prepared in step S1. By controlling the proportion of the bottom slag and the molten steel, the optimal effects of removing S and reducing the erosion to a furnace lining can be achieved.
Further, in step S3, the Si-Ca is added in an amount of 0.05% by weight based on the weight of the molten steel. By controlling the amount of the added Si-Ca, the oxygen in the molten steel is preliminarily removed, and excessive impurities are also prevented from being introduced into the molten steel.
Further, in step S4, al in the pre-melted slag 2 O 3 And the mass ratio of CaO is 45. By controlling the composition proportion of the pre-melted slag in the step S4, the optimal effect of removing sulfur and phosphorus in the slag can be achieved, and the content of non-metal slag inclusion in the slag can be reduced to the greatest extent.
Further, in step S6, the first diffusion deoxidation time is 15 minutes. By controlling the time of the first diffusion deoxidation, the method can remove the excessive oxygen in the slag and prepare for sample analysis in the subsequent second diffusion deoxidation.
Further, in step S7, the deoxidizer is Al-CaO, and the amount of the deoxidizer added is 0.10% to 0.20% of the weight of the slag. The adoption of Al-CaO deoxidizer avoids the formation of solid Al 2 O 3 Solid Al can be obtained by adding a certain amount of CaO 2 O 3 Calcium aluminate changed into liquid state, thereby reducing the problem of nozzle blockage: while controlling the addition amount of Al can avoid Al 2 O 3 Too much or too little CaO in the molten steel is not only ineffective in improving nozzle clogging, but also increases the degree of nozzle clogging.
Further, in step S7, the deoxidizer is added into the slag in 10 batches, and the interval time of each batch is 5-7min. By adding the deoxidizer in batches, the phenomenon that excessive solid Al is formed in local parts of the slag due to the fact that the equivalent of Al is larger than that of O because too much deoxidizer is added at one time can be avoided 2 O 3 。
Further, in step S7, the time of the second diffusion deoxidation is: the diffusion deoxidation time of the slag in the medium frequency furnace with the furnace volume of less than 1 ton is not less than 40min, and the diffusion deoxidation time in the medium frequency furnace with the furnace volume of 2-4 tons is not less than 60min. The sufficient diffusion deoxidation time is beneficial to deoxidation of the furnace slag and floating of impurities in the furnace slag, and is beneficial to removing the impurities in the furnace slag.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below with reference to embodiments of the present invention, and it should be apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
A method for smelting UNS N06600 steel in an intermediate frequency furnace comprises the following steps:
s1, preparing materials: in an intermediate frequency furnace, preparing molten steel according to the following ingredients, by mass, 0.08% of C, 0.15% of Si, 0.5% of Mn, 0.02% of P, 0.01% of S, 15.89% of Cr, 74.5% of Ni, 8.5% of Fe, 0.10% of Al and 0.25% of Ti; and lime is used for bottoming when preparing molten steel.
In the step, a certain amount of Al and C is added into the mixture to facilitate deoxidation, and Si and Mn are compounded in the mixture to deoxidize and prevent oxygen supersaturation.
S2, adding bottom slag and melting: after the step S1 is finished, adding bottom slag into the intermediate frequency furnace and melting, wherein the bottom slag is prepared from CaO and CaF 2 Composition, and CaO and CaF in the bottom slag 2 The mass ratio is 8:2, the weight of the bottom slag is 1 percent of that of the molten steel prepared in the step S1;
adding CaO and CaF in the step 2 The purpose of the bottom slag is to remove S and prevent molten steel from being directly contacted with the atmosphere and oxidized, so that the heat loss in the smelting process is reduced, and the energy utilization rate is improved; by controlling CaO and CaF 2 The mass ratio is 8.
S3, precipitation and deoxidation: after the molten steel prepared in the step S2 is molten down, adding Si-Ca lines into the intermediate frequency furnace for precipitation deoxidation, wherein the adding amount of Si-Ca is 0.05 percent of the weight of the molten steel;
this step contributes to the reduction of the oxygen content in the molten steel by precipitation deoxidation by adding Si-Ca wire.
S4, slagging off and new slag making: after the precipitation and deoxidation in the step S3 are finished, slagging off is carried out, and Al serving as a slag charge component is added into the intermediate frequency furnace 2 O 3 And pre-melted slag of CaO, al in the pre-melted slag 2 O 3 And CaO in a ratio of 45:55, making new slag;
the slag component in the step is Al 2 O 3 And removing sulfur and phosphorus in initial acid slag in the furnace by using the pre-melted slag of CaO so as to reduce the corrosion of the initial acid slag on a furnace lining.
S5, alloying: after the new slag is manufactured in the step S4, adding chromium metal into the slag for alloying;
this step contributes to the oxidation and corrosion resistance of UNS N06600 steel by adding metallic chromium to the slag.
S6, first diffusion deoxidation: after the step S5 is finished, adding Al blocks and Al-CaO into the slag to perform primary diffusion deoxidation for 15 minutes;
in the step, a part of oxygen in the slag is removed firstly through first diffusion deoxidation.
S7, second diffusion deoxidation: after the step S6 is finished, sampling and analyzing stokehole components, adding a deoxidizer into the slag in batches, and then carrying out second diffusion deoxidation, wherein the deoxidizer is Al-CaO, the deoxidizer is added into the slag in 10 batches, the interval time of each batch is 5-7min, and the adding amount of the deoxidizer is 0.10-0.20% of the weight of the slag; the time for diffusion deoxidation is as follows: the diffusion deoxidation time of the slag in the intermediate frequency furnace with the furnace volume of less than 1 ton is not less than 40min, and the diffusion deoxidation time in the intermediate frequency furnace with the furnace volume of less than 2-4 tons is not less than 60min;
in the step, the components in front of the furnace are analyzed, other elements can be added into the slag according to the analysis result to adjust the element proportion of the slag, and then the second diffusion deoxidation is carried out to further remove FeO in the slag.
S8, tapping: and (7) after the step S7 is finished, adjusting the slag amount, keeping white slag for a certain time, and then tapping to obtain UNS N06600 steel.
Compared with the prior art, the invention controls CaO and CaF in the bottom slag 2 The proportion can help melt lime without corroding the furnace lining; the invention also adds Al as a slag charge component in the slagging process 2 O 3 And the pre-melted slag of CaO removes sulfur and phosphorus in the initial acid slag in the furnace, thereby reducing the corrosion of the initial acid slag on the furnace lining. The intermediate frequency furnace has the advantages of high smelting speed, good electricity-saving effect, less burning loss and low energy consumption, and improves the smelting efficiency; the multiple diffusion deoxidation enables the internal structure of the steel ingot to be more compact, the purity is high, the sulfur content is low, the non-metallic inclusion is less, the surface of the steel ingot is smooth, clean, uniform and compact, the metallographic structure and the chemical components are uniform, the oxygen and hydrogen content and the non-metallic inclusion content of UNS N06600 steel can be reduced, the corrosion resistance of the UNS N06600 steel is improved, the corrosion of furnace slag to a furnace lining is reduced, the smelting furnace life is prolonged, and the production cost is reduced.
Example 1
The method for smelting UNS N06600 steel in the 1 ton intermediate frequency furnace comprises the following steps:
s1, preparing materials: in an intermediate frequency furnace, preparing molten steel according to the following ingredients, by mass, 0.08% of C, 0.15% of Si, 0.5% of Mn, 0.02% of P, 0.01% of S, 15.89% of Cr, 74.5% of Ni, 8.5% of Fe, 0.10% of Al and 0.25% of Ti; and lime is used for bottoming when preparing molten steel.
S2, adding bottom slag and melting: after the step S1 is finished, adding bottom slag into the intermediate frequency furnace and melting, wherein the bottom slag is prepared from CaO and CaF 2 Composition, and CaO and CaF in the bottom slag 2 The proportion is 8;
s3, precipitation and deoxidation: after the molten steel prepared in the step S2 is molten down, adding Si-Ca lines into an intermediate frequency furnace for precipitation deoxidation, wherein the adding amount of Si-Ca is 0.05 percent of the weight of the molten steel;
s4, removing slag and making new slag: after the precipitation and deoxidation in the step S3 are finished, slagging off is carried out, and Al serving as a slag charge component is added into the intermediate frequency furnace 2 O 3 And pre-melted slag of CaO, al in the pre-melted slag 2 O 3 And CaO in a ratio of 45;
s5, alloying: after the new slag is manufactured in the step S4, adding chromium metal into the slag for alloying;
s6, first diffusion deoxidation: after the step S5 is finished, adding Al blocks and Al-CaO into the slag to perform primary diffusion deoxidation for 15 minutes;
s7, second diffusion deoxidation: after the step S6 is completed, sampling and analyzing the components in front of the furnace, analyzing to obtain the content of gas and non-metallic inclusions in the slag as shown in Table 1, adding a deoxidizer into the slag in batches, and then performing second diffusion deoxidation, wherein the deoxidizer is Al-CaO, the deoxidizer is added into the slag in 10 batches, the interval time of each batch is 5, and the adding amount of the deoxidizer is 0.10 percent of the weight of the slag; the diffusion deoxidation time is 40min;
s8, tapping: after the step S7 is finished, adjusting the amount of slag, keeping white slag for a certain time, and then tapping to obtain UNS N06600 steel;
the campaign of the intermediate frequency furnace for smelting UNS N06600 steel by the method provided in this example was 38 times, as shown in Table 2.
Comparative example 1
Using CaF 2 And CaO is pre-melted slag to smelt UNS N06600 steel in a 1-ton intermediate frequency furnace, and the method comprises the following steps:
s1, preparing materials: in an intermediate frequency furnace, the components are mixed according to the following parts by mass to prepare molten steel, wherein the C content is 0.08%, the Si content is 0.15%, the Mn content is 0.5%, the P content is 0.02%, the S content is 0.01%, the Cr content is 15.89%, the Ni content is 74.5%, the Fe content is 8.5%, the Al content is 0.10%, and the Ti content is 0.25%; and lime is used for bottoming when preparing molten steel.
S2, adding bottom slag and melting: after the step S1 is finished, adding bottom slag into the intermediate frequency furnace and melting, wherein the bottom slag is prepared from CaO and CaF 2 Composition, and CaO and CaF in the bottom slag 2 The proportion is 8;
s3, precipitation and deoxidation: after the molten steel prepared in the step S2 is molten down, adding Si-Ca lines into an intermediate frequency furnace for precipitation deoxidation, wherein the addition of Si-Ca is 0.05 percent of the weight of the molten steel;
s4, slagging off and new slag making: after the precipitation and deoxidation in the step S3 are finished, slagging off is carried out, and CaF is added as a slag charge component in an intermediate frequency furnace 2 And pre-melted slag of CaO, caF in the pre-melted slag 2 And CaO in a mass ratio of 50;
s5, alloying: after the new slag is manufactured in the step S4, adding chromium metal into the slag for alloying;
s6, first diffusion deoxidation: after the step S5 is finished, adding Al blocks and Al-CaO into the slag to perform primary diffusion deoxidation for 15 minutes;
s7, second diffusion deoxidation: after the step S6 is completed, sampling and analyzing the components in front of the furnace, analyzing to obtain the contents of gas and non-metallic inclusions in the slag as shown in Table 1, adding a deoxidizing agent into the slag in batches, and then carrying out second diffusion deoxidation, wherein the deoxidizing agent is Al-CaO, the deoxidizing agent is added into the slag in 10 batches, the interval time of each batch is 5-7min, and the adding amount of the deoxidizing agent is 0.10 percent of the weight of the slag; the diffusion deoxidation time is 40min;
s8, tapping: after the step S7 is finished, adjusting the amount of slag, keeping white slag for a certain time, and then tapping to obtain UNS N06600 steel;
the campaign of the intermediate frequency furnace for smelting UNS N06600 steel using the method provided in this comparative example was 27 times, as shown in table 2.
TABLE 1
TABLE 2
| Slag-forming material | Furnace age | |
| Comparative example 1 | CaO-CaF 2 | 27 times of |
| Example 1 | Ca0-Al 2 O 3 | 38 times (twice) |
Example 2
The method for smelting UNS N06600 steel by using the 2-ton intermediate frequency furnace comprises the following steps:
s1, preparing materials: in an intermediate frequency furnace, preparing molten steel according to the following ingredients, by mass, 0.08% of C, 0.15% of Si, 0.5% of Mn, 0.02% of P, 0.01% of S, 15.89% of Cr, 74.5% of Ni, 8.5% of Fe, 0.10% of Al and 0.25% of Ti; and lime is used for bottoming when preparing molten steel.
S2, adding bottom slag and melting: after the step S1 is finished, adding bottom slag into the intermediate frequency furnace and melting, wherein the bottom slag is prepared from CaO and CaF 2 The components of the composition are as follows,and CaO and CaF in the bottom slag 2 The proportion is 8:2, the weight of the bottom slag is 1 percent of that of the molten steel prepared in the step S1;
s3, precipitation and deoxidation: after the molten steel prepared in the step S2 is molten down, adding Si-Ca lines into an intermediate frequency furnace for precipitation deoxidation, wherein the addition of the Si-Ca is 0.05 percent of the weight of the molten steel;
s4, slagging off and new slag making: after the precipitation and deoxidation in the step S3 are finished, slagging off is carried out, and Al serving as a slag charge component is added into the intermediate frequency furnace 2 O 3 And pre-melted slag of CaO, al in the pre-melted slag 2 O 3 And CaO in a ratio of 45;
s5, alloying: after the new slag is manufactured in the step S4, adding chromium metal into the slag for alloying;
s6, first diffusion deoxidation: after the step S5 is finished, adding Al blocks and Al-CaO into the slag to perform primary diffusion deoxidation for 15 minutes;
s7, second diffusion deoxidation: after the step S6 is completed, sampling and analyzing the components in front of the furnace, analyzing to obtain the content of gas and non-metallic inclusions in the slag as shown in Table 3, adding a deoxidizer into the slag in batches, and then performing second diffusion deoxidation, wherein the deoxidizer is Al-CaO, the deoxidizer is added into the slag in 10 batches, the interval time of each batch is 7min, and the adding amount of the deoxidizer is 0.20 percent of the weight of the slag; the time for diffusion deoxidation is 60min;
s8, tapping: and (5) after the step (S7) is finished, adjusting the slag amount, keeping white slag for a certain time, and then tapping to obtain UNS N06600 steel.
The campaign of the intermediate frequency furnace for smelting UNS N06600 steel using the method provided in this example was 36 times, as shown in table 4.
Comparative example 2
Using CaF 2 And CaO is pre-melted slag to smelt UNS N06600 steel in a 2-ton intermediate frequency furnace, and the method comprises the following steps:
s1, preparing materials: in an intermediate frequency furnace, preparing molten steel according to the following ingredients, by mass, 0.08% of C, 0.15% of Si, 0.5% of Mn, 0.02% of P, 0.01% of S, 15.89% of Cr, 74.5% of Ni, 8.5% of Fe, 0.10% of Al and 0.25% of Ti; and lime is used for bottoming when preparing molten steel.
S2, adding bottom slag and melting: after the step S1 is finished, adding bottom slag into the intermediate frequency furnace and melting the bottom slag, wherein the bottom slag is prepared from CaO and CaF 2 Composition, and CaO and CaF in the bottom slag 2 The proportion is 8;
s3, precipitation and deoxidation: after the molten steel prepared in the step S2 is molten down, adding Si-Ca lines into an intermediate frequency furnace for precipitation deoxidation, wherein the addition of the Si-Ca is 0.05 percent of the weight of the molten steel;
s4, slagging off and new slag making: after the precipitation and deoxidation in the step S3 are finished, slagging off is carried out, and CaF is added as a slag charge component in an intermediate frequency furnace 2 And pre-melted slag of CaO, caF in the pre-melted slag 2 And CaO in a mass ratio of 50;
s5, alloying: after the new slag is manufactured in the step S4, adding chromium metal into the slag for alloying;
s6, first diffusion deoxidation: after the step S5 is finished, adding Al blocks and Al-CaO into the slag to perform primary diffusion deoxidation for 15 minutes;
s7, second diffusion deoxidation: after the step S6 is completed, sampling and analyzing the components in front of the furnace, analyzing to obtain the content of gas and non-metallic inclusions in the slag as shown in Table 3, adding the deoxidizer into the slag in batches, and then carrying out second diffusion deoxidation, wherein the deoxidizer is Al-CaO, the deoxidizer is added into the slag in 10 batches, the interval time of each batch is 7min, and the adding amount of the deoxidizer is 0.20 percent of the weight of the slag; the diffusion deoxidation time is 60min;
s8, tapping: and (5) after the step (S7) is finished, adjusting the slag amount, keeping white slag for a certain time, and then tapping to obtain UNS N06600 steel.
The campaign of the intermediate frequency furnace for smelting UNS N06600 steel using the method provided in this comparative example was 25 times, as shown in table 4.
TABLE 3
TABLE 4
| Slag-forming material | Furnace age | |
| Comparative example 1 | CaO-CaF 2 | 25 times of |
| Example 1 | Ca0-Al 2 O 3 | 36 times (twice) |
The disclosure is not limited thereto, however. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and such changes and modifications will fall within the scope of the present invention.
Claims (8)
1. A method for smelting UNS N06600 steel by an intermediate frequency furnace is characterized by comprising the following steps:
s1, preparing materials: in an intermediate frequency furnace, preparing molten steel according to the following ingredients, by mass, 0.08% of C, 0.15% of Si, 0.5% of Mn, 0.02% of P, 0.01% of S, 15.89% of Cr, 74.5% of Ni, 8.5% of Fe, 0.10% of Al and 0.25% of Ti; lime is used for bottoming when preparing molten steel;
s2, adding bottom slag and melting: after the step S1 is finished, in an intermediate frequency furnaceAdding bottom slag and melting, wherein the bottom slag is prepared from CaO and CaF 2 Composition, and CaO and CaF in the bottom slag 2 The mass ratio of (1) to (2);
s3, precipitation and deoxidation: after the molten steel prepared in the step S2 is melted down, adding Si-Ca lines into the intermediate frequency furnace for precipitation and deoxidation;
s4, slagging off and new slag making: after the precipitation and deoxidation in the step S3 are finished, slagging off is carried out, and Al serving as a slag charge component is added into the intermediate frequency furnace 2 O 3 And CaO pre-melting slag to make new slag;
s5, alloying: after the new slag is manufactured in the step S4, adding metallic chromium into the slag for alloying;
s6, first diffusion deoxidation: after the step S5 is finished, adding Al blocks and Al-CaO into the slag to perform first diffusion deoxidation;
s7, second diffusion deoxidation: after the step S6 is finished, sampling and analyzing stokehole components, adding a deoxidizer into the furnace slag in batches, and then carrying out second diffusion deoxidation;
s8, tapping: and (5) after the step (S7) is finished, adjusting the amount of the slag, keeping the white slag for a certain time, and then tapping to obtain UNS N06600 steel.
2. The method for smelting UNS N06600 steel by using an intermediate frequency furnace according to claim 1, wherein in the step S2, the weight of the bottom slag is 1% of the weight of the molten steel prepared in the step S1.
3. The method for smelting UNS N06600 steel by using the intermediate frequency furnace according to claim 1, wherein in the step S3, the addition amount of Si-Ca is 0.05% of the weight of the molten steel.
4. The method for smelting UNS N06600 steel by using an intermediate frequency furnace as claimed in claim 1, wherein in the step S4, al in the pre-melted slag is adopted 2 O 3 And the mass ratio of CaO is 45.
5. The method for smelting UNS N06600 steel by using the intermediate frequency furnace according to claim 1, wherein in the step S6, the first diffusion deoxidation time is 15 minutes.
6. The method for smelting UNS N06600 steel by using a medium frequency furnace according to claim 1, wherein in the step S7, the deoxidizer is Al-CaO, and the amount of the deoxidizer added is 0.10-0.20% of the weight of the slag.
7. The method for smelting UNS N06600 steel by using an intermediate frequency furnace according to claim 6, wherein in the step S7, the deoxidizer is added to the slag in 10 batches, and the time interval between each batch is 5-7min.
8. The method for smelting UNS N06600 steel by using the intermediate frequency furnace as claimed in claim 7, wherein in the step S7, the time for the second diffusion deoxidation is as follows: the diffusion deoxidation time of the slag in the intermediate frequency furnace with the furnace volume of less than 1 ton is not less than 40min, and the diffusion deoxidation time in the intermediate frequency furnace with the furnace volume of 2-4 tons is not less than 60min.
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| CN116555604A (en) * | 2023-05-09 | 2023-08-08 | 山西太钢不锈钢股份有限公司 | Ni-Cr-Fe alloy and method for improving corrosion resistance of plate thereof |
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