CN115707785A - Smelting process for producing square billet aluminum killed steel by slagging-off before LF (ladle furnace) refining - Google Patents
Smelting process for producing square billet aluminum killed steel by slagging-off before LF (ladle furnace) refining Download PDFInfo
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- CN115707785A CN115707785A CN202211520923.0A CN202211520923A CN115707785A CN 115707785 A CN115707785 A CN 115707785A CN 202211520923 A CN202211520923 A CN 202211520923A CN 115707785 A CN115707785 A CN 115707785A
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Abstract
The invention relates to a smelting process for producing square billet aluminum killed steel by slagging-off before LF (ladle furnace) refining, which specifically comprises the following steps: 1) Tapping and slag washing; 2) Deoxidizing and regulating slag after the furnace; 3) In the later tapping period, steel slag in a ladle is passivated by adopting active lime; 4) Hoisting the ladle from a ladle car below the converter to a refining cross ladle car; 5) Carrying out refining cross-slag-dragging treatment; 6) LF refining treatment; 7) And (5) square billet operation. The invention has the beneficial effects that: before refining treatment in an LF refining furnace, a refining ladle car carries out molten steel slag salvaging under the condition that a ladle is upright, converter slag tapping treatment is carried out on a converter with large slag tapping amount per ton steel and nominal capacity smaller than 100T, and through molten steel slag salvaging treatment, fluctuation of slag tapping amount at the top of the ladle is eliminated, LF refining slag regulation operation is stabilized, and smelting difficulty of square billet aluminum killed steel is reduced.
Description
Technical Field
The invention relates to a smelting process, in particular to a smelting process for producing square billet aluminum killed steel by slagging-off before LF (ladle furnace) refining.
Background
Low-carbon steel with carbon content less than or equal to 0.10 percent, and the iron oxide content in the converter final slag is high and is usually 0.20 to 0.25 percent; at the moment, the final slag of the converter is relatively thin and has low viscosity, and the slag discharging amount in the converter tapping process is relatively large. Medium carbon steel with carbon content more than 0.25 percent, and the content of ferric oxide in the converter final slag is about 0.15 percent; the final slag site of the converter is thicker and has high viscosity, and the slag discharging amount in the tapping process of the converter is relatively small. The aluminum killed steel aims to reduce the content of iron oxide in slag and improve the alkalinity of slag; the content of iron oxide in the converter final slag is high, and the difficulty of reducing the oxidability of the final slag is high; and the consistency of the converter final slag influences the slag discharging amount of the converter. When the end point carbon is low, the viscosity of the end slag is small and thin, and the slag discharging amount in the tapping process is relatively large; when the slag discharging amount is large, the slag adjusting difficulty for changing slag components is correspondingly increased.
For solving the problem of molten steel flocculation of square billet aluminum killed steel, high-alkalinity high-alumina LF final slag in a low melting point area needs to be quickly formed in the production of aluminum killed steel. The converter slag discharging amount and the final slag iron oxide content seriously affect the adjustment of a billet aluminum killed steel LF slag system, and restrict the rapid formation of low-melting-point high-alkalinity high-alumina LF final slag. Compared with the converter final slag oxidability, the converter tapping slag quantity has larger influence on the LF slag system adjustment, and is directly related to the production stability of the square billet aluminum killed steel.
The control mode of the converter slag discharge amount comprises sliding plate slag blocking and slag blocking cone slag blocking, and although the sliding plate slag blocking effect is good, the requirement on converter splashing control is high. Therefore, there is a need to find a new method for reducing the amount of slag in the converter in the ladle, and slag skimming of molten steel is a good choice.
Disclosure of Invention
The invention aims to provide a smelting process for producing square billet aluminum killed steel by slagging before LF refining, which is characterized in that before refining treatment in an LF refining furnace, a refining ladle car carries out molten steel slag salvaging under the condition that a ladle is upright, converter deslagging treatment is carried out on a converter with a nominal capacity of less than 100T and a large slag amount per ton of steel, fluctuation of the slag amount at the top of the ladle is eliminated through the molten steel slag salvaging treatment, the LF refining slag adjusting operation is stabilized, and the smelting difficulty of the square billet aluminum killed steel is reduced.
A smelting process for producing square billet aluminum killed steel by slagging-off before LF refining comprises the following steps:
1) Tapping and slag washing: according to the different carbon contents of steel types, the steel ladle synthetic slag is added, the lower the carbon content is, the larger the adding amount of the steel ladle synthetic slag is, and when the molten steel reaches 2/5 of the quality of full ladle molten steel in a steel ladle, 4kg/t-7kg/t of steel ladle synthetic slag is added, wherein the steel ladle synthetic slag comprises CaO:65% -70% of Al 2 O 3 ：20%-25%、SiO 3： 3-5 percent of the slag, and the balance of ferric oxide impurities, and finishing the slag washing operation when the molten steel reaches 2/3 of the mass of the full ladle molten steel;
2) Deoxidizing and regulating slag after the furnace: adding aluminum-manganese-iron and steel slag modifier according to different carbon contents of steel types, wherein the lower the carbon content is, the larger the adding amount of the aluminum-manganese-iron and steel slag modifier is, and adding 2kg/t-5kg/t of aluminum-manganese-iron into a steel ladle for deoxidation in the slag washing process; adding 0.6kg/t-1kg/t steel slag modifier for slag adjustment;
3) And passivating the steel slag in the steel ladle by using active lime at the later tapping stage: after washing of the molten steel synthetic slag is finished, 95kg-100kg of metallurgical lime is added into a steel ladle in a manual throwing mode, so that converter slag is passivated, the converter slag and the metallurgical lime are promoted to be condensed to form slag blocks, and slag is convenient to fish;
4) Hoisting the ladle from a ladle car below the converter to a refining cross ladle car: after tapping, driving a ladle car below the converter to a refining span, and hoisting the ladle to the ladle car of the LF furnace by using a crown block;
5) And (3) refining, cross-slag dragging treatment: starting an LF ladle car, and moving a ladle to a slag fishing station; starting a slag conveyor placed on the LF platform, and operating a slag rake of the slag conveyor to take out viscous steel slag blocks in a steel ladle under the condition that the steel ladle is upright and does not tip over; pouring the fished slag into a fixed slag tank which is arranged beside the slag fishing station and on the ground; fishing out the steel slag in the vertical ladle to the mass content of about 80-90%;
6) LF refining treatment: after slag fishing, opening the buggy ladle from the slag fishing station to the refining station, descending a furnace cover, feeding an aluminum wire at one time according to the yield of the aluminum wire of the aluminum killed steel being 25-40%, adding 4-6kg/t of metallurgical lime, adjusting bottom blowing argon, and carrying out molten steel temperature rise treatment on a lower electrode to form a high-alkalinity and high-alumina refining slag system required by the aluminum killed steel;
7) Square billet operation: the castable is cast by adopting large ladle pouring flow protection and is subjected to middle ladle argon blowing protection, so that the castability of molten steel of square billet aluminum killed steel is improved; the electromagnetic stirring and the steam fog cooling of the crystallizer are adopted to improve the quality of square billet aluminum killed steel.
The steel slag modifier in the step 2) is prepared from the following components in parts by weight: 38-44 parts of MAl and Al 2 O 3 :22-28 parts of CaO:28-34 parts.
The mass content of the steel slag blocks fished out in the step 5) is 80-90%.
In the step 6), the temperature of the molten steel is increased to 1590-1620 ℃.
The binary alkalinity R of high alkalinity in the refining slag system in the step 6) is more than 6, and Al in high alumina 2 O 3 The content is 22 to 35 percent.
The invention has the beneficial effects that:
1) The invention provides an effective control method for smelting square billet aluminum killed steel by a small converter with the temperature of below 100T, solves the problem of large slag discharging amount of small converter per ton steel, and reduces the slag discharging amount from 6kg/T-10kg/T to 2-3kg/T at present;
2) The method reduces the difficulty in controlling the tapping of the square billet aluminum killed steel converter, particularly the difficulty in controlling the low-carbon square billet aluminum killed steel with high content of iron oxide in the final slag of the converter and low slag viscosity, and eliminates the adverse effect of the tapping and slag discharging of the converter on the smelting of the square billet aluminum killed steel by adopting the slag dragging operation of the molten steel after the converter taps;
3) The invention can stabilize the operation of the square billet aluminum killed steel LF refining furnace, adopts the slag dragging operation method after the converter tapping, can stably control the top slag quantity in the ladle within the range of 3kg/t-5kg/t, is convenient for the adjustment of the LF refining slag system, and can quickly reach the conditions that the binary alkalinity R is more than 6 and the Al is more than 2 O 3 The refining slag system of square billet aluminum killed steel with the content of 22-35 percent is a control target.
Detailed Description
Example 1.
The present invention will be further described with reference to the following examples.
A smelting process for producing square billet aluminum killed steel by slagging-off before LF refining is used for smelting SWRCH8A, and comprises the following steps:
1) Tapping and slag washing: in a steel ladle, when the molten steel reaches 2/5 of the mass of the full molten steel, 4kg/t-7kg/t of steel ladle synthetic slag is added, wherein the steel ladle synthetic slag comprises CaO:65% -70% of Al 2 O 3 ：20%-25%、SiO 3 :3-5 percent of the total weight of the molten steel, and the balance of ferric oxide impurities, and the synthetic slag washing is carried out, and the slag washing operation is finished when the molten steel reaches 2/3 of the mass of the full ladle molten steel;
2) Deoxidizing and regulating slag after the furnace: adding 4.5kg/t of aluminum, manganese and iron into the steel ladle for deoxidation in the slag washing process; adding 1kg/t of steel slag modifier for slag adjustment;
3) And passivating the steel slag in the steel ladle by using active lime at the later tapping stage: after the washing of the molten steel synthetic slag is finished, adding 100kg of metallurgical lime into a ladle in a manual casting mode;
4) Hoisting the ladle from a ladle car below the converter to a refining cross ladle car: after tapping, driving a ladle car below the converter to a refining span, and hoisting the ladle to a ladle car of the LF by using a crown block;
5) And (3) refining span slag dragging treatment: starting an LF ladle car, and moving a ladle to a slag fishing station; starting a slag conveyor placed on the LF platform, and operating a slag rake of the slag conveyor to take out slag blocks in a ladle under the condition that the ladle is upright and does not tip over; pouring the fished slag into a fixed slag tank which is arranged beside the slag fishing station and on the ground; fishing out the steel slag in the vertical steel ladle to reach the mass content of about 90 percent;
6) LF refining treatment, namely opening a ladle car from a slag dragging station to a refining station after slag dragging is finished, lowering a furnace cover, and feeding an aluminum wire once according to the yield of refined aluminum of 28 percent; then adding 6kg/t of metallurgical lime, adjusting bottom blowing argon, and heating the lower electrode; the temperature of the molten steel is raised to 1600 ℃ for one time, and a high-alkalinity high-alumina refining slag system required by the aluminum killed steel is formed;
7) Square billet operation: adopting large ladle pouring flow protection pouring and middle ladle argon blowing protection; electromagnetic stirring and cooling by vapor fog of a crystallizer are adopted.
The steel slag modifier in the step 2) is prepared from the following components in parts by weight: 38-44 parts of MAl and Al 2 O 3 :22-28 parts of CaO:28-34 parts.
The refining slag system in the step 6) has high-alkalinity dualityAlkalinity R is more than 6, and Al in high alumina 2 O 3 The content is 22%.
Example 2.
A smelting process for producing square billet aluminum killed steel by slagging-off before LF refining is used for smelting SWRCH22A, and comprises the following steps:
1) Tapping and slag washing: when the molten steel reaches 2/5 of the mass of the full-package molten steel in the steel ladle, 4kg/t-7kg/t of steel ladle synthetic slag is added, wherein the steel ladle synthetic slag comprises CaO:65% -70% of Al 2 O 3 ：20%-25%、SiO 3： 3-5 percent of the total weight of the molten steel, and the balance of ferric oxide impurities, and the synthetic slag washing is carried out, and the slag washing operation is finished when the molten steel reaches 2/3 of the mass of the full ladle molten steel;
2) Deoxidizing and regulating slag after the furnace: adding 3kg/t of aluminum, manganese and iron into the steel ladle for deoxidation in the slag washing process; adding 0.8kg/t steel slag modifier for slag adjustment;
3) And (3) passivating steel slag in a ladle by using active lime at the later tapping stage: after the washing of the molten steel synthetic slag is finished, adding 100kg of metallurgical lime into a ladle in a manual feeding mode;
4) Hoisting the ladle from a ladle car below the converter to a refining cross ladle car: after tapping, driving a ladle car below the converter to a refining span, and hoisting the ladle to a ladle car of the LF by using a crown block;
5) And (3) refining span slag dragging treatment: starting an LF ladle car, and moving a ladle to a slag fishing station; starting a slag conveyor placed on the LF platform, and operating a slag rake of the slag conveyor to take out slag blocks in a ladle under the condition that the ladle is upright and not tipped; pouring the fished slag into a fixed slag tank which is arranged beside the slag fishing station and on the ground; fishing out the steel slag in the vertical steel ladle to reach the mass content of about 80 percent;
6) LF refining treatment: after the slag is fished, opening the ladle car from the slag fishing station to the refining station, lowering the furnace cover, and feeding an aluminum wire once according to the yield of refined aluminum of 32%; then adding 5kg/t of metallurgical lime, adjusting bottom blowing argon, and heating the lower electrode; the temperature of the molten steel is raised to 1605 ℃ for one time, and a high-alkalinity high-alumina refining slag system required by the aluminum killed steel is formed;
7) Square billet operation: the method adopts large ladle pouring flow protection pouring and medium ladle argon blowing protection, and adopts crystallizer electromagnetic stirring and vapor fog cooling.
The binary alkalinity R of high alkalinity in the refining slag system in the step 6) is more than 6, and Al in high alumina 2 O 3 The content is 35%.
Claims (5)
1. A smelting process for producing square billet aluminum killed steel by slagging-off before LF refining is characterized by comprising the following steps:
1) Tapping and slag washing: in the steel ladle, when the molten steel reaches 2/5 of the mass of the full-ladle molten steel, 4kg/t-7kg/t of steel ladle synthetic slag is added, wherein the steel ladle synthetic slag comprises the following components in percentage by mass: 65% -70% of Al 2 O 3 ：20%-25%、SiO 2 :3-5 percent of iron oxide impurities, and finishing the slag washing operation when the molten steel reaches 2/3 of the mass of the full ladle molten steel;
2) Deoxidizing and regulating slag after the furnace: adding 2kg/t-5kg/t of aluminum-manganese-iron into the steel ladle for deoxidation in the slag washing process; adding 0.6kg/t-1kg/t steel slag modifier for slag adjustment;
3) And (3) passivating steel slag in a ladle by using active lime at the later tapping stage: after the washing of the molten steel synthetic slag is finished, 95kg-100kg of metallurgical lime is added into a steel ladle;
4) Hoisting the ladle from a ladle car below the converter to a refining cross ladle car: after tapping, driving a ladle car below the converter to a refining span, and hoisting the ladle to a ladle car of the LF by using a crown block;
5) And (3) refining, cross-slag dragging treatment: starting an LF ladle car, and moving a ladle to a slag fishing station; starting a slag salvaging machine arranged on the LF platform, and operating a slag harrow of the slag salvaging machine to fish out steel slag blocks in a steel ladle under the condition that the steel ladle is upright and not overturned;
6) LF refining treatment: after slag fishing, opening a ladle car from a slag fishing station to a refining station, lowering a furnace cover, feeding an aluminum wire at one time according to the yield of the aluminum killed steel aluminum wire of 25-40%, adding 4-6kg/t of metallurgical lime, adjusting bottom blowing argon, and heating the molten steel by a lower electrode to form a refined slag system with high alkalinity and high alumina required by the aluminum killed steel;
7) Square billet operation: the castable is cast by adopting large ladle pouring flow protection and is subjected to middle ladle argon blowing protection, so that the castability of molten steel of square billet aluminum killed steel is improved; the electromagnetic stirring and the steam fog cooling of the crystallizer are adopted to improve the quality of square billet aluminum killed steel.
2. The smelting process for producing square billet aluminum killed steel by slagging-off before LF refining as recited in claim 1, wherein: the steel slag modifier in the step 2) is prepared from the following components in parts by weight: 38-44 parts of MAl and Al 2 O 3 :22-28 parts of CaO:28-34 parts.
3. The smelting process for producing square billet aluminum killed steel by slagging-off before LF refining as recited in claim 1, wherein: the mass content of the steel slag blocks fished out in the step 5) is 80% -90%.
4. The smelting process for producing square billet aluminum killed steel by slagging-off before LF refining as claimed in claim 1, wherein: in the step 6), the temperature of the molten steel is increased to 1590-1620 ℃.
5. The smelting process for producing square billet aluminum killed steel by slagging-off before LF refining as recited in claim 1, wherein: the binary alkalinity R of high alkalinity in the refining slag system in the step 6) is more than 6, and Al in high alumina 2 O 3 The content is 22 to 35 percent.
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| CN202211520923.0A CN115707785A (en) | 2022-12-01 | 2022-12-01 | Smelting process for producing square billet aluminum killed steel by slagging-off before LF (ladle furnace) refining |
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Citations (6)
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|---|---|---|---|---|
| CN1093413A (en) * | 1994-02-02 | 1994-10-12 | 江苏江南铁合金厂 | Be used for ferroaluminium of aluminium killed steel deoxidation and preparation method thereof |
| KR20050092263A (en) * | 2004-03-15 | 2005-09-21 | 주식회사 포스코 | Method for refining aluminum killed steel |
| CN111663018A (en) * | 2020-05-29 | 2020-09-15 | 中天钢铁集团有限公司 | Ladle dephosphorization method |
| CN112322835A (en) * | 2020-09-28 | 2021-02-05 | 甘肃酒钢集团宏兴钢铁股份有限公司 | LF high-alkalinity slagging process for square billet aluminum killed steel |
| CN114480974A (en) * | 2022-01-29 | 2022-05-13 | 新疆八一钢铁股份有限公司 | Production method of high-strength fatigue-resistant sucker rod steel |
| CN114686644A (en) * | 2022-03-16 | 2022-07-01 | 阳春新钢铁有限责任公司 | Method for quickly producing white slag in LF (ladle furnace) |
-
2022
- 2022-12-01 CN CN202211520923.0A patent/CN115707785A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1093413A (en) * | 1994-02-02 | 1994-10-12 | 江苏江南铁合金厂 | Be used for ferroaluminium of aluminium killed steel deoxidation and preparation method thereof |
| KR20050092263A (en) * | 2004-03-15 | 2005-09-21 | 주식회사 포스코 | Method for refining aluminum killed steel |
| CN111663018A (en) * | 2020-05-29 | 2020-09-15 | 中天钢铁集团有限公司 | Ladle dephosphorization method |
| CN112322835A (en) * | 2020-09-28 | 2021-02-05 | 甘肃酒钢集团宏兴钢铁股份有限公司 | LF high-alkalinity slagging process for square billet aluminum killed steel |
| CN114480974A (en) * | 2022-01-29 | 2022-05-13 | 新疆八一钢铁股份有限公司 | Production method of high-strength fatigue-resistant sucker rod steel |
| CN114686644A (en) * | 2022-03-16 | 2022-07-01 | 阳春新钢铁有限责任公司 | Method for quickly producing white slag in LF (ladle furnace) |
Non-Patent Citations (1)
| Title |
|---|
| 周朝刚;王书桓;王文辉;艾立群;赵定国;薛月凯;郝华强;: "基于高废钢比的转炉脱磷工艺研究", 钢铁钒钛, no. 05 * |
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