CN114672615A - Deoxidation method of low-carbon drawn steel Q195LB - Google Patents
Deoxidation method of low-carbon drawn steel Q195LB Download PDFInfo
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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
- 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
- C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered 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
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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Abstract
The invention relates to the technical field of external refining of steelmaking furnaces, in particular to a deoxidation method of low-carbon drawn steel Q195LB, which can accurately determine silicon loss according to argon blowing flow (molten steel bare diameter) and power transmission time (electric arc length), and further add corresponding amount of ferrosilicon powder according to the specific silicon loss to realize accurate silicon deoxidation so as to stably reach a target oxygen value, namely realize accurate and reliable deoxidation.
Description
Technical Field
The invention relates to the technical field of steelmaking external refining, in particular to a deoxidation method of low-carbon wiredrawing steel Q195 LB.
Background
During production of low-carbon welding wire steel, no matter top suction or side suction is adopted for dust removal, LF refining slagging generally adopts ferrosilicon powder to carry out diffusion deoxidation of a slag surface of the slag, white slag is manufactured by increasing the thickness of a slag layer and the submerged arc effect of the whole refining process is kept, but the foaming capacity of the slag cannot be achieved by increasing the slag amount and the cost of slag materials is increased, the ferrosilicon powder deoxidation is easily involved into molten steel for silicon increasing, the ferrosilicon powder cannot fully reduce FeO and MnO in the slag when the slag is foamed, oxides in the slag are easily reduced incompletely, and oxygen in the slag returns to the molten steel along with the temperature rise during LF refining, so that secondary oxidation of the molten steel is caused, and the total oxygen in the steel is higher.
The related art is difficult to precisely and reliably deoxidize.
Disclosure of Invention
The invention aims to provide a deoxidation method of low-carbon drawn steel Q195LB, which can accurately and reliably deoxidize.
The invention is realized by the following steps:
in a first aspect, the present invention provides a method for deoxidizing a low-carbon drawn steel Q195LB, comprising:
s1: carrying out deoxidation alloying and slag washing on the molten steel by converter tapping;
s2: sampling at an argon station;
s3: LF refining is carried out, oxygen is determined when the refining is finished to a station, and a slag surface deoxidizer is added according to an oxygen value;
s4: 1) adding ferrosilicon powder according to the silicon content of the argon station sample to perform slag surface deoxidation;
2) according to the argon blowing flow and the power transmission time, adding ferrosilicon powder corresponding to the silicon loss of the steel grade; wherein the content of the first and second substances,
when argon is blown, the total silicon loss W1 is 0.00006% multiplied by Ar (1cm) multiplied by t1+ 0.00006% multiplied by Ar (2cm) multiplied by t2+ … … + 0.00006% multiplied by Ar (50cm) multiplied by t50, wherein Ar (1cm) -Ar (50cm) are different exposed diameters of the molten steel, and t 1-t 50 are argon blowing time (min) of the different exposed diameters of the molten steel;
when pure, the total silicon loss W2 is 0.00275% + 0.0005% × (K1 th-5) + 0.00055% × K2 th + 0.0006% × K3 th + 0.00065% × K4 th + 0.0007% × K5 th + 0.00075% × K6 th + 0.0008% × K7 th + 0.00085% × K8 th + 0.0009% × K9 th + 0.00095% × K10 th + 0.001% × K11 th, wherein K1 th to K11 th refer to the slagging time (power transmission) of 1 to 11 voltages, and K1 th ≧ 5 (min); the total silicon loss W caused by the argon blowing flow and the power transmission time is W1+ W2; the total amount of ferrosilicon powder G2 which needs to be added corresponding to the total silicon loss is W/0.01 percent multiplied by 0.19, and 0.19 (kg/ton steel) is the amount of ferrosilicon powder which needs to be added per 0.01 percent of silicon loss;
s5: LF sampling, namely determining oxygen at 1 time, and adding ferrosilicon powder for deoxidation according to the oxygen determination value w [ O ] -15 ppm;
s6: according to the result of the LF sampling 1, when the silicon content is less than the process card target value of 0.04%, continuing to deoxidize by using the ferrosilicon powder;
s7: LF sampling is carried out for 2 hours, oxygen is determined, and ferrosilicon powder is added for deoxidation according to the oxygen determination value w [ O ] -10 ppm.
In an alternative embodiment, the step S4 of 1) adding ferrosilicon powder according to the content of silicon in the argon station sample to perform slag surface deoxidation specifically includes:
when the silicon content w (Si) of the argon station sample is more than or equal to 0.018 percent, the ferrosilicon powder is not added in the early stage, when the silicon content w (Si) of the argon station sample is less than 0.018 percent, the ferrosilicon powder is supplemented according to the difference delta w (Si) of the silicon content, and the added ferrosilicon powder amount G1 is (0.018 percent to delta w (Si)) to 0.01 percent multiplied by 0.19 kg/ton of steel.
In an alternative embodiment, in step S1, the steps of deoxidation alloying and slag washing are performed, including: adding 0.83-0.88 kg of silicomanganese, 1.66-2.1 kg of ferro-aluminium, 0.41-0.46 kg of ferro-silicon and 4.2-4.5 kg of lime into molten steel per ton of steel.
In an alternative embodiment, in step S3, 0.016kg x (constant oxygen value-30 ppm) of aluminum particles per ton of steel are added in the early stage and no aluminum particles are added in the middle and late stages (constant oxygen value-30 ppm).
In an optional embodiment, in step S3, the proportion and addition manner of the slag surface deoxidizer include: adding 4.2-4.5 kg of synthetic slag per ton of steel, 0.83-1.25 kg of fluorite balls per ton of steel, 4.2-4.5 kg of lime per ton of steel and aluminum particles in sequence in the electrifying process; wherein, the lime and the aluminum particles are added in three batches, the aluminum particles and the lime in each batch are mixed and added, the amount of each batch of lime is 1.4 kg-1.5 kg/ton steel, and the amount of each batch of aluminum particles is 0.016kg multiplied by (constant oxygen value-30 ppm)/3 ton steel.
In an optional embodiment, in step S3, after the slag surface deoxidizer is added, the content of Als is controlled to be 0.002-0.007%.
In an alternative embodiment, in step S5, ferrosilicon powder is added in an amount G3 of 0.016 (kg/ton steel) × (w [ O ] -15 ppm).
In an alternative embodiment, in step S6, when the silicon content is greater than or equal to the target value of the process card of 0.04%, the usage amount of the ferrosilicon powder is reduced or the ferrosilicon powder is not added any more.
In an alternative embodiment, in step S7, ferrosilicon powder is added in an amount G4 of 0.016 (kg/ton steel) × (w [ O ] -10 ppm).
In an alternative embodiment, the deoxidation method of the low-carbon drawn steel Q195LB further includes, after step S7, step S8: continuing alloying according to the result of the LF sampling 2;
s9: the out-station free oxygen content is controlled at 10-15 ppm.
The invention has the following beneficial effects:
the deoxidation method of the low-carbon wire-drawing steel Q195LB provided by the embodiment of the invention can accurately determine the silicon loss according to the argon blowing flow (the exposed diameter of molten steel) and the power transmission time (the length of electric arc), and can further add the corresponding amount of ferrosilicon powder according to the specific silicon loss to realize accurate silicon deoxidation so as to stably reach the target oxygen value, namely realize accurate and reliable deoxidation.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.
In the production of low carbon steel, deoxidation treatment is generally required. The related art provides deoxidation methods including: smelting molten steel through a converter, and refining in an LF furnace; in the LF furnace, a mixture of ferrosilicon powder and carbon powder is used as a foaming deoxidizer; the deoxidation mode not only easily causes recarburization of the molten steel, but also cannot realize accurate and reliable deoxidation; also related art deoxygenation means include: carrying out deoxidation alloying on molten steel by tapping from a converter, adding high-aluminum refining slag into an LF refining furnace according to the content of Als in an argon station to carry out slag surface deoxidation, and adding ferrosilicon powder to carry out deoxidation; the deoxidation force is not enough in the method, and the ferrosilicon powder can be added for deoxidation only after the result of the silicon content of the LF sample is obtained, so that the deoxidation time is long, the controllability is not strong, and the deoxidation is not easy to be reliably and accurately completed.
The deoxidation method of the low-carbon drawn steel Q195LB of the embodiment can accurately and reliably perform deoxidation, and comprises the following steps:
s1: carrying out deoxidation alloying and slag washing on the molten steel by converter tapping; the method specifically comprises the following steps: adding 0.83-0.88 kg of silicomanganese to molten steel per ton of steel, for example: 0.83 kg/ton steel, 0.85 kg/ton steel, 0.86 kg/ton steel, 0.87 kg/ton steel, 0.88 kg/ton steel, etc., 1.66 to 2.1 kg/ton steel of ferro-aluminum, for example: 1.66 kg/ton steel, 1.8 kg/ton steel, 2.0 kg/ton steel, 2.1 kg/ton steel, etc., 0.41 to 0.46 kg/ton steel of ferrosilicon, for example: 0.41 kg/ton steel, 0.42 kg/ton steel, 0.43 kg/ton steel, 0.44 kg/ton steel, 0.45 kg/ton steel, 0.46 kg/ton steel, etc., lime 4.2 to 4.5 kg/ton steel, for example: 4.2 kg/ton steel, 4.3 kg/ton steel, 4.4 kg/ton steel, 4.5 kg/ton steel, etc.
S2: sampling is carried out at an argon station.
S3: LF refining is carried out to a station for oxygen determination, and a slag surface deoxidizer is added according to the oxygen value.
The method specifically comprises the following steps: determining the dosage of the slag surface deoxidizer aluminum particles according to the oxygen value; wherein, 0.016kg x (constant oxygen value-30 ppm) of aluminum particles are added into one ton of steel according to the constant oxygen value-30 ppm in the early stage, and no aluminum particles are added in the middle and later stages.
Further, the slag surface deoxidizer comprises the following components in proportion and addition modes: adding 4.2-4.5 kg of synthetic slag per ton of steel (such as 4.2 kg/ton steel, 4.3 kg/ton steel, 4.4 kg/ton steel, 4.5 kg/ton steel and the like), 0.83-1.25 kg of fluorite ball per ton steel (such as 0.83 kg/ton steel, 0.9 kg/ton steel, 1.0 kg/ton steel, 1.1 kg/ton steel, 1.25 kg/ton steel and the like), 4.2-4.5 kg of lime per ton steel (such as 4.2 kg/ton steel, 4.3 kg/ton steel, 4.4 kg/ton steel, 4.5 kg/ton steel and the like), and aluminum particles in sequence during electrifying; wherein, lime and aluminum particles are added in three batches, and the aluminum particles and the lime in each batch are mixed and added, the amount of each batch of lime is 1.4 kg-1.5 kg/ton steel, and the amount of each batch of aluminum particles is 0.016kg x (constant oxygen value-30 ppm)/3/ton steel. Therefore, the slag surface deoxidizer can be uniformly scattered on the slag surface in a small batch adding mode so as to achieve a good deoxidizing effect.
Further, in step S3, after the slag surface deoxidizer is added, the content of Als (acid-soluble aluminum content in steel) is controlled to be 0.002 to 0.007% (e.g., 0.002%, 0.004%, 0.005%, 0.007%, etc.).
S4: 1) adding ferrosilicon powder according to the silicon content of the argon station sample to perform slag surface deoxidation; the method specifically comprises the following steps:
when the silicon content w (Si) of the argon station sample is more than or equal to 0.018 percent, the ferrosilicon powder is not added in the early stage; when the silicon content w (Si) of the argon station sample is less than 0.018%, ferrosilicon powder is added according to the difference delta w (Si) of the silicon content, 0.08% -delta w (Si) is added, and 0.19kg ferrosilicon powder is required to be added per ton of steel when the silicon content is increased by 0.01%, so that the added ferrosilicon powder G1 is equal to (0.018% -delta w (Si))/0.01% × 0.19kg ferrosilicon powder per ton of steel.
2) According to the argon blowing flow (the exposed diameter of molten steel) and the power transmission time (the length of electric arc), ferrosilicon powder is added corresponding to the silicon loss of the steel grade.
The inventor researches and discovers that the argon blowing flow is 60Nm3When the molten steel is exposed for one hour (the diameter of the exposed molten steel is 50cm), silicon is lost by 0.03% every 10min, namely 0.003% every 1 min; the argon blowing flow is 35Nm3When the molten steel is exposed for hours (the diameter of the exposed molten steel is 25cm), 0.015 percent of silicon is lost every 10min, namely 0.0015 percent of silicon is lost every 1 min; the flow rate of argon blowing is less than or equal to 10Nm3When the silicon loss is 0 per 10min (the exposed diameter of the molten steel is 0cm), namely, the silicon loss is 0 per 1 min; therefore, the silicon loss is related to the argon blowing flow (the exposed diameter of the molten steel), and the larger the exposed diameter of the molten steel is, the more serious the secondary oxidation of the molten steel is, and the larger the silicon loss is. According to calculation, when argon is blown for 1min and the exposed diameter of molten steel is 1cm, the silicon loss is 0.03%/10/50 is 0.00006%, and the silicon loss of different exposed diameters of molten steel in different argon blowing time is as follows: 0.00006% x Ar diameter (cm) x time t (min). When argon is blown at different exposed diameters of molten steel, the total silicon loss W1 is 0.00006% multiplied by Ar (1cm) multiplied by t1+ 0.00006% multiplied by Ar (2cm) multiplied by t2+ … … + 0.00006% multiplied by Ar (50cm) multiplied by t50, wherein Ar (1cm) to Ar (50cm) are different exposed diameters of the molten steel, and t1 to t50 are argon blowing time (min) at different exposed diameters of the molten steel.
In the power transmission process, because the arc impact area is in a high-temperature state, the equilibrium solubility of oxygen in molten steel is increased, gas molecules are ionized under the action of an arc, the concentration of free oxygen is increased in the LF power transmission process, and silicon is oxidized and burnt. The arc length increases with the increase of the secondary voltage, and the arc length is in direct proportion to the arc voltage; the voltage of 1-11 gears rises step by step, and the longer the electric arc. The inventors have also found that the longer the arc, the more likely secondary oxidation of the molten steel is caused, and the greater the silicon loss. Therefore, the power transmission silicon loss amount is correlated with the power transmission gear. The silicon loss is 0.02% when the power transmission is most stable (the exposed diameter of argon is 25cm) in the middle and later periods of 1-grade (low voltage) for 10min, and the silicon loss during argon blowing power transmission-the silicon loss during pure argon blowing-is equal to the silicon loss during pure power transmission by comparing the power transmission during argon blowing with the non-power transmission data; 10min pure power transmission silicon loss: 0.02% -0.015% ═ 0.005%, 1min silicon loss ═ 0.005%/10 ═ 0.0005%. The length of the electric arc rises step by step along with 1-11 voltage, and the longer the electric arc is, the larger the voltage of the electric arc is, the larger the silicon loss is; taking the silicon loss as a base 0.0005% (min) when pure power transmission is carried out at the low gear 1 (when the arc is most stable at the middle and later stages), respectively giving correction coefficients of 1.1-2.0 to other gears (voltage at the gears 2-11), and calculating the silicon loss at each gear 1 min: k2 gear: 0.0005% × 1.1 ═ 0.00055%, K3 rating: 0.0005% × 1.2 ═ 0.0006%, K4 rating: 0.0005% × 1.3 ═ 0.00065%, K5 rating: 0.0005% × 1.4 ═ 0.0007%, K6 th order 0.0005% × 1.5 ═ 0.00075%, K7 th order 0.0005% × 1.6 ═ 0.0008%, K8 th order 0.0005% × 1.7 ═ 0.00085%, K9 th order 0.0005% × 1.8 ═ 0.0009%, K10 th order 0.0005% × 1.9 ═ 0.00095%, and K11 th order 0.0005% × 2.0 ═ 0.001%. The LF early stage slagging stage is generally 1-level low-voltage power transmission, the slagging time is generally 5min, the silicon loss is larger than that of the submerged arc due to a thinner slag layer and an unsatisfactory submerged arc effect, and the correction coefficient is 0.0005% multiplied by 1.1 to 0.00055%, and the 5min silicon loss is 0.00055% multiplied by 5 to 0.00275%. In conclusion, the following results are obtained: when the silicon loss is pure, the total silicon loss W2 is 0.00275% + 0.0005% × (K1 th-5) (min) + 0.00055% × K2 th-e (min) + 0.0006% × K3 th-e (min) + 0.00065% × K4 th-e (min) + 0.0007% × K5 th-e (min) + 0.00075% × K6 th-e (min) + 0.0008% × K7 th-e (min) + 0.00085% × K8 th-e (min) + 0.0009% × K9 th-e (min) + 0.00095% × K10 th-e (min) + 0.001% × K11 th-e, wherein K1 th-K11 th-e refers to the slagging time (min) of 1-11 th-stage voltage, and K1 th-5 (min).
The total silicon loss W caused by the argon blowing flow (the exposed diameter of molten steel) and the power transmission time (the length of an electric arc) is W1+ W2; the total amount of ferrosilicon powder G2 required to be added for the total silicon loss was W/0.01% × 0.19, where 0.19 (kg/ton steel) was the amount of ferrosilicon powder required to be added per 0.01% of silicon loss.
In addition, the LF refining is performed until oxygen is determined at a station, and aluminum particles are added according to the oxygen determination value to perform slag surface deoxidation (step S3). Then adding ferrosilicon powder according to the silicon content of the argon station sample to perform slag surface deoxidation; thus, 2 deoxidizing materials were used in this example: aluminum particles and ferrosilicon powder. The process goal of low-carbon steel deoxidation is to control the silicon content in the steel to 0.018% as early as possible (at the argon station or early stage of LF refining) and to maintain a certain silicon content so that the dissolved oxygen in the steel is low; if the silicon content in the steel is too low, the dissolved oxygen in the steel is higher, and the subsequent deoxidation difficulty is high; when the silicon content in the steel is too high, the silicon component is likely to be out of specification due to excessive deoxidation. The LF refining utilizes the aluminum particles to perform strong deoxidation on the slag surface in a targeted manner according to the oxygen determination value, and then adds the ferrosilicon powder for cooperation deoxidation, so that the silicon content in the steel is increased while the slag surface is deoxidized, the dissolved oxygen in the steel is lower, the deoxidation is accurately and reliably realized, and no adverse effect is caused.
S5: LF sampling is carried out for 1 time, oxygen is determined, and ferrosilicon powder is added for deoxidation according to the oxygen determination value w [ O ] -15 ppm. Wherein 15ppm is free oxygen of steel grade, the free oxygen is in the process requirement range, and the slag is also at the level of yellow and white slag; and the ferrosilicon powder is gradually added for deoxidation, a certain low oxygen content is kept, and risk reservation can be made for the subsequent adjustment of silicon components in the molten steel.
The addition of ferrosilicon powder (0.016 kg/ton) can eliminate 1ppm of oxygen in steel, and the addition amount of ferrosilicon powder G3 is 0.016 (kg/ton) x (w [ O ] -15 ppm).
S6: according to the result of the LF sampling 1, when the silicon content is less than the process card target value of 0.04%, continuing to deoxidize by using the ferrosilicon powder; based on the risk reservation during silicon alloying, the addition of the ferrosilicon powder cannot be completed in one step, and the silicon loss during argon blowing and power transmission in step S4 and the investment of the subsequent deoxidized ferrosilicon powder need to be considered. When the silicon content is more than or equal to the target value of the process card of 0.04%, the using amount of the silicon iron powder is reduced or the silicon iron powder is not added any more, wherein the reduction of the using amount of the silicon iron powder can mean that: the using amount of the ferrosilicon powder is less than the adding amount of the ferrosilicon powder in the previous step; thus, the silicon content of the molten steel can be utilized to deoxidize under the kinetic condition until the silicon content is reduced.
S7: LF sampling is carried out for 2 hours, oxygen is determined, and ferrosilicon powder is added for deoxidation according to the oxygen determination value w [ O ] -10 ppm. Wherein, 10ppm is steel grade free oxygen, the free oxygen reaches the outbound target requirement, and the slag is at the white slag level; after the adjustment according to the silicon component of the sample 1, the silicon content is in a controllable range, so that ferrosilicon powder is directly added according to 10ppm of free oxygen for deoxidation.
1ppm oxygen in the steel can be removed when 0.016kg ferrosilicon powder is added per ton steel; the amount of ferrosilicon powder added in this step G4 ═ 0.016 (kg/ton steel) × (w [ O ] -10 ppm).
S8: continuing alloying according to the result of the LF sampling 2; it should be noted that the alloying manner is similar to that of the related art, and is not described herein. In step S8, the silicon loss during the argon blowing and power transmission in step S4 is taken into consideration, and the silicon can be prepared in place.
S9: the out-station free oxygen content is controlled at 10-15 ppm.
S10: calcium treatment and soft blowing can be carried out subsequently; the calcium treatment and soft blowing are similar to those of the related art, and are not described herein.
Example 1
102kg of silicomanganese, 201kg of aluminum iron, 50kg of silicon iron and 504kg of lime are added into the converter steel tapped from 120tLF of the Shao steel.
LF to standing oxygen 40ppm, and 19kg of aluminum pellets were added.
The bare diameter of the molten steel is 30cm, 1-gear electrification is carried out for 5min, then 4-gear electrification is carried out for 5min, and 503kg of synthetic slag, 144kg of fluorite balls and 505kg of lime are added in the process. According to the sample w (Si) 0.008% of an argon station sample, 23kg of ferrosilicon powder is added. Then, 64kg of ferrosilicon powder is added according to the silicon loss of 0.018% when the exposed diameter of the molten steel is 30cm for 10min, the silicon loss of 0.0028% when the molten steel is electrified for 5min at the 1-gear and is electrified for 5min at the 4-gear. And (3) powering off, forcibly stirring the molten steel with the exposed diameter of 50cm for 1min, wherein the silicon loss is 0.003 percent, and adding 7kg of ferrosilicon powder. Sampling 1, determining oxygen content to 16ppm, and adding ferrosilicon powder 2 kg. And continuing electrifying for 6min at the 4 th gear, wherein the exposed diameter of the molten steel is 25cm, the silicon content of the sample 1 is 0.032%, 15kg of ferrosilicon alloy and 28kg of low-manganese alloy are added, and 21kg of ferrosilicon powder is added according to the silicon loss of 0.009% at the exposed diameter of the molten steel of 25cm for 6min and the silicon loss of 0.0039% at the 4 th gear for electrifying for 6 min.
Cutting off power, stirring the molten steel with the exposed diameter of 50cm for 2min, wherein the silicon loss is 0.006 percent, and adding 14kg of ferrosilicon powder; sampling 2, determining oxygen content 12ppm, and adding 4kg of ferrosilicon powder (namely the ferrosilicon powder after main heating is added for 2 times, one time is 14kg, the other time is 4kg, and the total amount is 18 kg). Sample 2 had a composition of 0.044% silicon. Oxygen was determined to be 10 ppm. Feeding pure calcium wire 150 m, soft blowing for 10min, and hanging for continuous casting.
The following tables are example 1 and comparative example
In conclusion, according to the deoxidation method of the low-carbon drawn steel Q195LB, a plurality of batches of a small amount of aluminum particles are added for deoxidation of the slag surface according to the oxygen value and the optimized slag charge adding mode in the early stage, so that the deoxidation speed is high, the time is short, the effect is good, the content of Als is low, and Al is contained in the steel2O3The inclusion is less. In the early stage, the silicon content of the steel grade is controlled to be 0.018 percent according to the silicon content of the argon station sample and the target reference value, so that good deoxidation effect and reasonable silicon content can be ensured. According to the argon blowing flow (the exposed diameter of the molten steel), the power transmission time (the length of an electric arc), the silicon iron powder is added for supplementing alloying aiming at the silicon loss in the steel, and the silicon iron powder is added for diffusion deoxidation according to the oxygen setting value and the stage oxygen control, so that the accurate and reliable control of the deoxidation is achieved, the problem of excessive or insufficient silicon consumption caused by excessive or excessively low silicon addition is solved, the accurate deoxidation is realized, and the operability is high; the method of the invention can not cause the recarburization of the molten steel, and can solve the problems of poor deoxidation of the molten steel and the blockage of a continuous casting nozzle.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. 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 (10)
1. A method for deoxidizing a low-carbon drawn steel Q195LB, comprising:
s1: carrying out deoxidation alloying and slag washing on the molten steel by converter tapping;
s2: sampling at an argon station;
s3: LF refining is carried out, oxygen is determined when the refining is finished to a station, and a slag surface deoxidizer is added according to an oxygen value;
s4: 1) adding ferrosilicon powder according to the silicon content of the argon station sample to perform slag surface deoxidation;
2) according to the argon blowing flow and the power transmission time, adding ferrosilicon powder corresponding to the silicon loss of the steel grade; wherein the content of the first and second substances,
when argon is blown, the total silicon loss W1 is 0.00006% multiplied by Ar (1cm) multiplied by t1+ 0.00006% multiplied by Ar (2cm) multiplied by t2+ … … + 0.00006% multiplied by Ar (50cm) multiplied by t50, wherein Ar (1cm) -Ar (50cm) are different molten steel exposed diameters, and t 1-t 50 are argon blowing time (min) of different molten steel exposed diameters;
when pure, the total silicon loss W2 is 0.00275% + 0.0005% × (K1 th-5) + 0.00055% × K2 th + 0.0006% × K3 th + 0.00065% × K4 th + 0.0007% × K5 th + 0.00075% × K6 th + 0.0008% × K7 th + 0.00085% × K8 th + 0.0009% × K9 th + 0.00095% × K10 th + 0.001% × K11 th, wherein K1 th to K11 th refer to the slagging time (power transmission) of 1 to 11 voltages, and K1 th ≧ 5 (min); the total silicon loss W caused by the argon blowing flow and the power transmission time is W1+ W2; the total amount of ferrosilicon powder G2 which needs to be added corresponding to the total silicon loss is W/0.01 percent multiplied by 0.19, and 0.19 (kg/ton steel) is the amount of ferrosilicon powder which needs to be added per 0.01 percent of silicon loss;
s5: LF sampling, namely determining oxygen at 1 time, and adding ferrosilicon powder for deoxidation according to the oxygen determination value w [ O ] -15 ppm;
s6: according to the result of the LF sampling 1, when the silicon content is less than the process card target value of 0.04%, continuing to deoxidize by using the ferrosilicon powder;
s7: LF sampling is carried out for 2 hours, oxygen is determined, and ferrosilicon powder is added for deoxidation according to the oxygen determination value w [ O ] -10 ppm.
2. The method for deoxidizing low carbon drawn steel Q195LB as claimed in claim 1, wherein the step S4 of 1) adding ferrosilicon powder according to the argon station-like silicon content to deoxidize the slag surface specifically includes:
when the silicon content w (Si) of the argon station sample is more than or equal to 0.018 percent, the ferrosilicon powder is not added in the early stage, when the silicon content w (Si) of the argon station sample is less than 0.018 percent, the ferrosilicon powder is supplemented according to the difference delta w (Si) of the silicon content, and the added ferrosilicon powder amount G1 is more than (0.018 percent to delta w (Si)) and 0.01 percent multiplied by 0.19 kg/ton of steel.
3. The method for deoxidizing the low carbon drawn steel Q195LB as set forth in claim 1, wherein the step of performing deoxidation alloying and slag washing in step S1 includes: adding 0.83-0.88 kg of silicomanganese, 1.66-2.1 kg of ferro-aluminium, 0.41-0.46 kg of ferro-silicon and 4.2-4.5 kg of lime into molten steel per ton of steel.
4. The method of deoxidizing of low carbon steel wire drawing Q195LB as set forth in claim 1, wherein in step S3, 0.016kg x (constant oxygen value-30 ppm) aluminum grains per ton of steel are added at the early stage, and no aluminum grains are added at the middle and late stages.
5. The method for deoxidizing the low carbon drawn steel Q195LB as claimed in claim 4, wherein in step S3, the proportion and the adding manner of the slag surface deoxidizer include: adding 4.2-4.5 kg of synthetic slag per ton of steel, 0.83-1.25 kg of fluorite balls per ton of steel, 4.2-4.5 kg of lime per ton of steel and aluminum particles in sequence in the electrifying process; wherein, lime and aluminum particles are added in three batches, and the aluminum particles and the lime in each batch are mixed and added, the amount of each batch of lime is 1.4 kg-1.5 kg/ton steel, and the amount of each batch of aluminum particles is 0.016kg x (constant oxygen value-30 ppm)/3/ton steel.
6. The method for deoxidizing the low carbon drawn steel Q195LB as claimed in claim 5, wherein in step S3, the content of Als is controlled to be 0.002 to 0.007% after the slag surface deoxidizer is added.
7. The method for deoxidizing low carbon steel wire drawing Q195LB as set forth in claim 1, wherein in step S5, the ferrosilicon powder is added in an amount G3 ═ 0.016 (kg/ton steel) x (w [ O ] -15 ppm).
8. The method for deoxidizing low carbon drawn steel Q195LB as set forth in claim 1, wherein in step S6, when the silicon content is equal to or greater than the target value of the Process card of 0.04%, the amount of ferrosilicon powder used is reduced or no ferrosilicon powder is added.
9. The method for deoxidizing low carbon steel wire drawing Q195LB as claimed in claim 1, wherein in step S7, the amount of ferrosilicon powder added G4 is 0.016 (kg/ton steel) × (w [ O ] -10 ppm).
10. The method for deoxidizing low carbon drawn steel Q195LB as set forth in claim 1, wherein said method for deoxidizing low carbon drawn steel Q195LB further includes, after step S7, step S8: continuing alloying according to the result of the LF sampling 2;
s9: the content of free oxygen at the outlet is controlled between 10 and 15 ppm.
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