CN103469076A - Method for melting ultra-low carbon steel in LF (ladle furnace) - Google Patents
Method for melting ultra-low carbon steel in LF (ladle furnace) Download PDFInfo
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- CN103469076A CN103469076A CN 201310417260 CN201310417260A CN103469076A CN 103469076 A CN103469076 A CN 103469076A CN 201310417260 CN201310417260 CN 201310417260 CN 201310417260 A CN201310417260 A CN 201310417260A CN 103469076 A CN103469076 A CN 103469076A
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Abstract
The invention relates to a method for melting ultra-low carbon steel in an LF (ladle furnace). The method for melting the ultra-low carbon steel is characterized by comprising the following specific steps of (1) carrying out argon blowing and slagging on molten steel; (2) after breaking slag blankets open, adding aluminium to the molten steel; (3) carrying out electrode heating on the molten steel; (4) weighting lime in a feed bin before heating the molten steel; (5) controlling temperature; (6) lifting up an electrode; (7) finely adjusting the alloy according to the laboratory reports of a sample II; (8) after the components of alloy are qualified, carrying out fire feeding; and (9) stopping argon blowing. The method for melting the ultra-low carbon steel has the advantages that the top slag of the molten steel is completely melted by blowing lots of argon and fully slagging before heating the molten steel; the bottom argon blowing is controlled during heating the molten steel, or the argon is closed in the earlier stage of heating the molten steel, so that the opportunity that the molten steel is in contact with the electrode is reduced; aluminium and lime are added in batches; the opportunity of increasing the carbon content in the smelting process is effectively reduced by reducing the heating frequency in a smelting process and other manners; and the content of end point carbon is reduced, and the quality and the property of the product are improved.
Description
Technical field
The present invention relates to a kind of method of LF stove smelting suprelow carbon steel.
Background technology
The ultra low-carbon steel that the horse steel is produced, due to the restriction that is subject to the conditions such as horse steel water condition, steel scrap and CSP own characteristic, the technique that often adopts RH+LF stove duplex to produce.This technique molten steel is in the decarburization of RH stove, and to operations such as slag making in the LF stove, desulfurization, intensifications, this processing ease causes molten steel recarburization in the LF stove, finally causes the molten steel endpoint carbon content very high, even surpasses the scope that rules require and changes product performance.For the ultra low-carbon steel that guarantees this explained hereafter can meet the product performance requirement, need to reduce the carbon content of molten steel in the LF stove, thereby be badly in need of the technique of LF stove smelting suprelow carbon steel is improved.
Summary of the invention
For problems of the prior art, the object of the present invention is to provide a kind of technical scheme of method of LF stove smelting suprelow carbon steel.
The method of described a kind of LF stove smelting suprelow carbon steel, the chemical composition that it is characterized in that described ultra low-carbon steel comprises by weight percentage: C≤0.03%, Si≤0.15%, 1.2%≤Mn≤1.6%, P≤0.015%, S≤0.010%, 0.02%≤Al≤0.05%, 0.02%≤Nb≤0.04%, 0.005%≤Ti≤0.020%, 0.04≤V≤0.06%, 0.45%≤Cu≤0.70%, 0.30%≤Ni≤0.50%, 0.0008%≤B≤0.003%, N≤0.006%, and surplus is iron and inevitable impurity; The concrete steps that this ultra low-carbon steel is smelted are as follows: after 1) buggy ladle is got to and processed position, molten steel is carried out to the Argon slag, carry out strong Argon after slag blanket breaks, until slag blanket melts fully; 2) slag blanket breaks in backward molten steel and adds aluminium, according to Al content in RH stove composition, divides 23 batches and adds aluminium; Add after aluminium and continue to strong Argon in molten steel, reactive aluminum fully after, survey liquid steel temperature T1, sample one; 3) molten steel is carried out to heated by electrodes, reduce the BOTTOM ARGON BLOWING flow before heated by electrodes or when molten steel heats before 2 3min close argon gas; 4) take lime before the molten steel heating in feed bin, starting the arc heating after weighing finishes adds first lime when electrode just will contact molten steel; Add the lime identical with first weight fast in molten steel at twice again; Again according to the submerged arc situation, minutes 26 times by every batch, to be first lime weight 1/2nd add lime in molten steel; Control the heating-up time according to T1 when 5) molten steel heats, as T1≤1570 ℃, heated up by 4 ℃/min, target temperature is 1610-1620 ℃; As T1 >=1580C, by 5 ℃/min, heated up, target temperature is 1610-1620 ℃; 6) lift electrode, carry out secondary according to Al content in sampling one result of laboratory test and adjust aluminium, it is 0.4% that secondary is adjusted the aluminium target; Strong Argon slag making desulfurization, regularly get slag specimen and observe color; After strong Argon 8 10min, turn argon blowing rate to 100 200L/min down, survey liquid steel temperature T2, sample two; T2 carries out the soft blow operation at 1,590 1595 ℃, waits for sampling two results of laboratory test; 7) finely tune alloy according to the result of laboratory test of sampling two, alloy is mediated by molten steel interalloy proportioning target value; 8) T2 is at 1,590 1595 ℃, and the qualified beginning line feeding of alloy ingredient, line feeding before measurement temperature T 3, and T3 surveys twice, and requires temperature gap≤3 degree twice; 2 3min after line feeding, testing temperature T4, sample four, then carry out the soft blow operation, soft blow time >=6min; By the time sample the Four Modernizations and test result; Composition is qualified, and temperature T 4 sets off after meeting the out-station temperature requirement; 9) stop Argon, buggy ladle is got to the bull ladle position, continuous casting platform on traveling crane.
The method of described a kind of LF stove smelting suprelow carbon steel, is characterized in that described strong Argon argon flow amount is >=600L/min.
The method of described a kind of LF stove smelting suprelow carbon steel, is characterized in that described soft blow argon flow amount is≤100L/min.
The method of described a kind of LF stove smelting suprelow carbon steel, it is characterized in that described strong Argon slag making desulfurization stage, as T2<1590 ℃, by 56 ℃/min, molten steel is carried out to secondary temperature elevation, the secondary temperature elevation target value is 1,590 1595 ℃, and T2 carries out the soft blow operation again after rising to 1,590 1595 ℃.
The method of described a kind of LF stove smelting suprelow carbon steel, it is characterized in that described molten steel heating times be controlled at≤2 times.
The method of described a kind of LF stove smelting suprelow carbon steel, is characterized in that described molten steel departures target temperature is 1,585 1590 ℃.
The method of described a kind of LF stove smelting suprelow carbon steel, is characterized in that the described fine setting alloy stage, as needs alloy amount weight >=100kg, after concocting gold, molten steel sampled to three assays.
The invention has the advantages that: the method for this LF stove smelting suprelow carbon steel, before heating by molten steel, large Argon is fully changed slag, and molten steel and top slag is melted fully; While controlling the molten steel heating, early stage is closed argon gas in BOTTOM ARGON BLOWING or molten steel heating, reduces the chance that molten steel is licked electrode; Adopt and add aluminium in batches and add lime in batches; Reduce the modes such as heating times in smelting process, effectively reduced the chance that in the smelting process, the carbon amount increases; Reduce endpoint carbon content, improved product quality and performances.
Embodiment
The method of LF stove smelting suprelow carbon steel of the present invention, the chemical composition of this ultra low-carbon steel comprises by weight percentage: C≤0.03%, Si≤0.15%, 1.2%≤Mn≤1.6%, P≤0.015%, S≤0.010%, 0.02%≤Al≤0.05%, 0.02%≤Nb≤0.04%, 0.005%≤Ti≤0.020%, 0.04≤V≤0.06%, 0.45%≤Cu≤0.70%, 0.30%≤Ni≤0.50%, 0.0008%≤B≤0.003%, N≤0.006%, and surplus is iron and inevitable impurity; The concrete steps that this ultra low-carbon steel is smelted are as follows: after 1) buggy ladle is got to and processed position, molten steel is carried out to the Argon slag, carry out strong Argon after slag blanket breaks, until slag blanket melts fully; 2) slag blanket breaks in backward molten steel and adds aluminium, according to Al content in RH stove composition, divides 23 batches and adds aluminium; Add after aluminium and continue to strong Argon in molten steel, reactive aluminum fully after, survey liquid steel temperature T1, sample one; 3) molten steel is carried out to heated by electrodes, reduce the BOTTOM ARGON BLOWING flow before heated by electrodes or when molten steel heats before 2 3min close argon gas; 4) take lime before the molten steel heating in feed bin, starting the arc heating after weighing finishes adds first lime when electrode just will contact molten steel; Add the lime identical with first weight fast in molten steel at twice again; Again according to the submerged arc situation, minutes 26 times by every batch, to be first lime weight 1/2nd add lime in molten steel; Control the heating-up time according to T1 when 5) molten steel heats, as T1≤1570 ℃, heated up by 4 ℃/min, target temperature is 1610-1620 ℃; As T1 >=1580C, by 5 ℃/min, heated up, target temperature is 1610-1620 ℃; 6) lift electrode, carry out secondary according to Al content in sampling one result of laboratory test and adjust aluminium, it is 0.4% that secondary is adjusted the aluminium target; Strong Argon slag making desulfurization, regularly get slag specimen and observe color; After strong Argon 8 10min, turn argon blowing rate to 100 200L/min down, survey liquid steel temperature T2, sample two; T2 carries out the soft blow operation at 1,590 1595 ℃, waits for sampling two results of laboratory test; 7) finely tune alloy according to the result of laboratory test of sampling two, alloy is mediated by molten steel interalloy proportioning target value; 8) T2 is at 1,590 1595 ℃, and the qualified beginning line feeding of alloy ingredient, line feeding before measurement temperature T 3, and T3 surveys twice, and requires temperature gap≤3 degree twice; 2 3min after line feeding, testing temperature T4, sample four, then carry out the soft blow operation, soft blow time >=6min; By the time sample the Four Modernizations and test result; Composition is qualified, and temperature T 4 sets off after meeting the out-station temperature requirement; 9) stop Argon, buggy ladle is got to the bull ladle position, continuous casting platform on traveling crane.
Above-mentioned strong Argon argon flow amount is >=600L/min.
Above-mentioned soft blow argon flow amount is≤100L/min.
Above-mentioned strong Argon slag making desulfurization stage, as T2<1590 ℃, carry out secondary temperature elevation by 56 ℃/min to molten steel, and the secondary temperature elevation target value is 1,590 1595 ℃, and T2 carries out the soft blow operation again after rising to 1,590 1595 ℃.
Above-mentioned molten steel heating times is controlled at≤and 2 times.
Above-mentioned molten steel departures target temperature is 1,585 1590 ℃.
In the above-mentioned fine setting alloy stage, as needs alloy amount weight >=100kg, after concocting gold, molten steel is sampled to three assays.
The invention has the advantages that: the method for this LF stove smelting suprelow carbon steel, before heating by molten steel, large Argon is fully changed slag, and molten steel and top slag is melted fully; While controlling the molten steel heating, early stage is closed argon gas in BOTTOM ARGON BLOWING or molten steel heating, reduces the chance that molten steel is licked electrode; Adopt and add aluminium in batches and add lime in batches; Reduce the modes such as heating times in smelting process, effectively reduced the chance that in the smelting process, the carbon amount increases; Reduce endpoint carbon content, improved product quality and performances.
After adopting this working method, while producing ultra low-carbon steel, the average carbon increasing amount of LF stove is reduced to 15 30ppm by 40 50ppm, the RH endpoint carbon content is controlled at below 20ppm, can guarantee that LF stove endpoint carbon content, below 50ppm, can meet the requirement of endpoint carbon content below 60ppm basically; More than the degradation caused because carbon content is high every month changes steel at least 3 stoves, according to 3 furnace gauges calculations per month, 120 tons of molten steel of every stove, degradation changes the steel price and reduces by 300 yuan/tons of steel, and 1 year direct benefit is ten thousand yuan of 3*300*120*12=129.6.
Claims (7)
1. the method for a LF stove smelting suprelow carbon steel, the chemical composition that it is characterized in that described ultra low-carbon steel comprises by weight percentage: C≤0.03%, Si≤0.15%, 1.2%≤Mn≤1.6%, P≤0.015%, S≤0.010%, 0.02%≤Al≤0.05%, 0.02%≤Nb≤0.04%, 0.005%≤Ti≤0.020%, 0.04≤V≤0.06%, 0.45%≤Cu≤0.70%, 0.30%≤Ni≤0.50%, 0.0008%≤B≤0.003%, N≤0.006%, and surplus is iron and inevitable impurity; The concrete steps that this ultra low-carbon steel is smelted are as follows: after 1) buggy ladle is got to and processed position, molten steel is carried out to the Argon slag, carry out strong Argon after slag blanket breaks, until slag blanket melts fully; 2) slag blanket breaks in backward molten steel and adds aluminium, according to Al content in RH stove composition, divides 23 batches and adds aluminium; Add after aluminium and continue to strong Argon in molten steel, reactive aluminum fully after, survey liquid steel temperature T1, sample one; 3) molten steel is carried out to heated by electrodes, reduce the BOTTOM ARGON BLOWING flow before heated by electrodes or when molten steel heats before 2 3min close argon gas; 4) take lime before the molten steel heating in feed bin, starting the arc heating after weighing finishes adds first lime when electrode just will contact molten steel; Add the lime identical with first weight fast in molten steel at twice again; Again according to the submerged arc situation, minutes 26 times by every batch, to be first lime weight 1/2nd add lime in molten steel; Control the heating-up time according to T1 when 5) molten steel heats, as T1≤1570 ℃, heated up by 4 ℃/min, target temperature is 1610-1620 ℃; As T1 >=1580C, by 5 ℃/min, heated up, target temperature is 1610-1620 ℃; 6) lift electrode, carry out secondary according to Al content in sampling one result of laboratory test and adjust aluminium, it is 0.4% that secondary is adjusted the aluminium target; Strong Argon slag making desulfurization, regularly get slag specimen and observe color; After strong Argon 8 10min, turn argon blowing rate to 100 200L/min down, survey liquid steel temperature T2, sample two; T2 carries out the soft blow operation at 1,590 1595 ℃, waits for sampling two results of laboratory test; 7) finely tune alloy according to the result of laboratory test of sampling two, alloy is mediated by molten steel interalloy proportioning target value; 8) T2 is at 1,590 1595 ℃, and the qualified beginning line feeding of alloy ingredient, line feeding before measurement temperature T 3, and T3 surveys twice, and requires temperature gap≤3 degree twice; 2 3min after line feeding, testing temperature T4, sample four, then carry out the soft blow operation, soft blow time >=6min; By the time sample the Four Modernizations and test result; Composition is qualified, and temperature T 4 sets off after meeting the out-station temperature requirement; 9) stop Argon, buggy ladle is got to the bull ladle position, continuous casting platform on traveling crane.
2. the method for a kind of LF stove smelting suprelow carbon steel according to claim 1, is characterized in that described strong Argon argon flow amount is >=600L/min.
3. the method for a kind of LF stove smelting suprelow carbon steel according to claim 1, is characterized in that described soft blow argon flow amount is≤100L/min.
4. the method for a kind of LF stove smelting suprelow carbon steel according to claim 1, it is characterized in that described strong Argon slag making desulfurization stage, as T2<1590 ℃, by 56 ℃/min, molten steel is carried out to secondary temperature elevation, the secondary temperature elevation target value is 1,590 1595 ℃, and T2 carries out the soft blow operation again after rising to 1,590 1595 ℃.
5. the method for a kind of LF stove smelting suprelow carbon steel according to claim 1, it is characterized in that described molten steel heating times be controlled at≤2 times.
6. the method for a kind of LF stove smelting suprelow carbon steel according to claim 1, is characterized in that described molten steel departures target temperature is 1,585 1590 ℃.
7. the method for a kind of LF stove smelting suprelow carbon steel according to claim 1, is characterized in that the described fine setting alloy stage, as needs alloy amount weight >=100kg, after concocting gold, molten steel sampled to three assays.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201310417260 CN103469076A (en) | 2013-09-13 | 2013-09-13 | Method for melting ultra-low carbon steel in LF (ladle furnace) |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104032092A (en) * | 2014-06-16 | 2014-09-10 | 首钢京唐钢铁联合有限责任公司 | Alloy for molten steel desulfurization and use method thereof in RH refining process |
| CN113913698A (en) * | 2021-10-22 | 2022-01-11 | 兰州理工大学 | High-strength high-conductivity flat steel and manufacturing method and application thereof |
-
2013
- 2013-09-13 CN CN 201310417260 patent/CN103469076A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104032092A (en) * | 2014-06-16 | 2014-09-10 | 首钢京唐钢铁联合有限责任公司 | Alloy for molten steel desulfurization and use method thereof in RH refining process |
| CN104032092B (en) * | 2014-06-16 | 2015-10-21 | 首钢京唐钢铁联合有限责任公司 | Alloy for molten steel desulfurization and use method thereof in RH refining process |
| CN113913698A (en) * | 2021-10-22 | 2022-01-11 | 兰州理工大学 | High-strength high-conductivity flat steel and manufacturing method and application thereof |
| CN113913698B (en) * | 2021-10-22 | 2022-09-20 | 兰州理工大学 | High-strength high-conductivity flat steel and manufacturing method and application thereof |
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Application publication date: 20131225 |