CN109055649B - Preparation method for extracting carbon and preserving manganese by converter smelting high-manganese high-silicon high-phosphorus iron water - Google Patents
Preparation method for extracting carbon and preserving manganese by converter smelting high-manganese high-silicon high-phosphorus iron water Download PDFInfo
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- CN109055649B CN109055649B CN201811154699.1A CN201811154699A CN109055649B CN 109055649 B CN109055649 B CN 109055649B CN 201811154699 A CN201811154699 A CN 201811154699A CN 109055649 B CN109055649 B CN 109055649B
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
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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
- C21C7/068—Decarburising
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Abstract
The invention discloses a method for preparing high-manganese high-silicon high-phosphorus molten iron (Mn1.10-1.50wt%, Si0.70-1.00wt%, P0.120-0.170 wt%, S less than or equal to 0.035wt%) by carbon extraction and manganese retention in converter smelting, which is characterized in that the method adopts the processes of slag retention operation, double slag slagging process, less slag smelting, constant-voltage variable-pressure gun operation in smelting process, converter one-down lowest gun position pressure gun operation, slag washing in tapping process, whole-process bottom blowing argon and the like, and integrates innovation, thereby optimizing the thermodynamics and the conditions of smelting reaction, obtaining good dephosphorization and desulfurization effects of smelting slag, avoiding the splashing of molten steel and slag in smelting process, effectively improving the distribution concentration of (MnO) in slag in smelting middle period, promoting the reduction of (MnO) in slag in smelting middle period, reducing the reoxidation of Mn in molten steel in later period in smelting period, obviously improving the residual Mn content (0.35-0.55wt%) in molten steel, reducing the addition amount of manganese alloy in deoxidation process, obviously reduces the consumption of steel-making alloy and the alloying cost, and improves the market competitiveness of the product.
Description
Technical Field
The invention belongs to the technical field of steel metallurgy steelmaking technology, and particularly relates to a method for smelting a high-manganese, high-silicon and high-phosphorus molten iron converter by extracting carbon and protecting manganese.
Background
Manganese (Mn) is a beneficial element in steel, and along with the continuous blowing process in the converter smelting process, most of Mn in molten iron is oxidized, and the residual Mn content of molten steel at the smelting end is low, so that the cost of the deoxidized and alloyed Mn alloy is high. The Mn content of molten steel at the smelting end point of the converter mainly comes from Mn in molten iron, manganese oxidation and reduction reactions occur among a metal melting pool, molten slag and oxygen in the blowing process, and the content of residual Mn finally remaining in the molten steel at the end point of the converter is influenced by factors such as slag quantity, oxidability of molten steel and slag at the end point of the converter, and the temperature at the end point of the converter. By optimizing the smelting process of the converter, the residual Mn content of the molten steel at the end point of the converter is improved, the consumption of the deoxidized and alloyed manganese alloy after the converter can be reduced, the production cost of steel making is reduced, and the market competitiveness of steel products is improved.
At present, in domestic steel mills, molten iron with Mn content less than or equal to 0.50wt% is mostly adopted for smelting, and because the Mn content of the molten iron is lower and the reduction effect of MnO in slag in the smelting process is poor, the residual Mn content of the molten steel at the smelting end point is lower (less than or equal to 0.12 wt%), the manganese alloy addition amount in the deoxidation alloying process is more, and the alloy consumption and the alloying cost are higher. In recent years, a few domestic steel mills develop technical attack work for improving the Mn content of molten iron, and the molten iron with the following chemical components is produced by a sintering process and high-manganese noble sand ore in high proportion: 1.10 to 1.50 weight percent of Mn, 0.70 to 1.00 weight percent of Si, 0.120 to 0.170 weight percent of P and less than or equal to 0.035 weight percent of S, and how to reduce splashing in the smelting process and improve the residual Mn content of molten steel at the end point to the maximum extent by adopting the high-manganese, high-silicon and high-phosphorus molten iron for smelting in a converter, thereby reducing the adding amount of manganese alloy in the deoxidation alloying process and reducing the steelmaking production cost is very important and urgent. At present, converter smelting in domestic steel mills is basically carried out by adopting low-Mn and low-P molten iron with the following chemical components (Mn is less than or equal to 0.50wt%, Si is 0.30-0.50wt%, and P is less than or equal to 0.100 wt%), a certain research report is carried out on the converter smelting process of the molten iron components, but no relevant research report is carried out on the carbon-extracting and manganese-protecting smelting process of a high-manganese high-silicon high-phosphorus molten iron converter. Aiming at the problems, the invention is needed to provide a preparation method for extracting carbon and protecting manganese by using high-manganese, high-silicon and high-phosphorus iron water in a converter.
Disclosure of Invention
The invention aims to provide a preparation method for extracting carbon and protecting manganese by smelting high-manganese high-silicon high-phosphorus iron water in a converter.
The aim of the invention is achieved by the following process steps:
A. the smelting and charging process comprises the following steps: pouring out all final slag in the converter after the slag splashing is finished after the steel tapping of the upper furnace, and pouring out 150kg/t of slag according to the formula of 130-SteelThe scrap steel is added into a 50-ton LD converter according to the proportion; 940kg/t according to 920-SteelThe molten iron charging proportion is that the following high manganese, high silicon and high phosphorus molten iron is added into a 50-ton LD converter according to the following temperature and mass ratio: the temperature of the molten iron is more than or equal to 1290 ℃, the components of the molten iron comprise 4.5 to 5.2 weight percent of C, 0.70 to 1.00 weight percent of Si, 1.10 to 1.50 weight percent of Mn, 0.120 to 0.170 weight percent of P, less than or equal to 0.035 weight percent of S, and the balance of Fe and inevitable impurities;
B. the early smelting process comprises the following steps: step A, after high-manganese, high-silicon, high-phosphorus molten iron and cold scrap steel are filled into a 50-ton LD converter, the converter is shaken front and back to expose the molten iron, then the molten iron is blown to an oxygen lance, the ignition oxygen pressure is 0.80-0.90 MPa, the blowing is carried out for 20 seconds, the lance position of the oxygen lance is controlled according to 1.4-1.5m, the oxygen pressure is controlled according to 0.85MPa, and the oxygen pressure is controlled according to 7.2-9.2kg/tSteelAdding conventional active lime for slagging; blowing for 20-70 s, lowering the lance position of the oxygen lance to 0.9m, and controlling the oxygen pressure at 0.85MPa, respectively at 10.9-13.5kg/tSteel、9.2-12.5kg/tSteel、3.5kg/tSteelAdding conventional active lime, light-burned dolomite and magnesite balls for slagging according to the proportion of 0.9-1.7kg/tSteelAdding a slagging agent to promote slagging; blowing for 70-300 s, raising the lance position of the oxygen lance to 1.0m, controlling the oxygen pressure at 0.85MPa and controlling the oxygen pressure at 0.5-1.0 kg/tSteelIn an amount to add conventional iron ore coolant; blowing for 350 seconds to 300 and 1.1m, lifting the oxygen lance to shake the converter to pour out partial early-stage slag when blowing for 350 seconds;
C. the middle-stage smelting process comprises the following steps: b, after the converter is shaken to pour out partial early-stage slag, the converter is shaken forward and is continuously blown down by an oxygen lance for secondary slagging, the blowing is carried out for 380-420 seconds, the lance position of the oxygen lance is controlled to be 1.1m, the oxygen pressure is controlled to be 0.85MPa, and the oxygen pressure is respectively 9.0-12.0kg/tSteel、9.0-11.0kg/tSteelAdding conventional active lime and light burned dolomite, and performing secondary smelting and slagging according to the proportion of 0.8-1.5kg/tSteelAdding a slagging agent for slagging according to the amount of the raw materials; blowing to 42Controlling the oxygen pressure to be 0.85MPa and the oxygen lance position to be 1.2m within 0-750 seconds; blowing for 750-plus 850 seconds, controlling the oxygen pressure at 0.85MPa, controlling the lance position of the oxygen lance to be 1.0m, pressing the lance position to the lance position of the oxygen lance for 0.8m, deep blowing for 30 seconds when blowing for 850 seconds, performing converter dumping sampling, and controlling the converter dumping molten steel temperature to be 1610-1630 ℃;
D. the final stage process of converter smelting: c, after the molten steel is poured out of the converter and sampled, swinging the converter to continue blowing by an oxygen lance, and blowing to 880 seconds-the end point tapping stage, wherein the oxygen pressure is controlled according to 0.85-0.90MPa, the lance position of the oxygen lance is controlled according to 0.8-0.9m, and the end point tapping molten steel temperature is controlled to be 1640-1660 ℃;
E. the converter tapping process comprises the following steps: d, adding active lime into the bottom of the steel ladle for washing before tapping of molten steel, wherein the addition amount of lime is 3.0kg/tSteel(ii) a A whole-process bottom argon blowing process is adopted in the tapping process, and the flow rate of argon is controlled to be 20-25 NL/min; finally, the smelting molten steel for extracting carbon and protecting manganese can be obtained.
Compared with the prior art, the invention has the beneficial effects that:
1. the preparation method for extracting carbon and retaining manganese in the high-manganese high-silicon high-phosphorus molten iron smelted by the converter, which is provided by the invention, comprises the steps of performing slag retaining operation, performing double-slag slagging process, performing less-slag smelting, performing constant-pressure variable gun operation in the smelting process, performing one-down lowest gun position pressure gun operation of the converter, performing slag washing in the tapping process, performing whole-process bottom argon blowing and the like, and is integrated and innovated, so that the smelting reaction kinetics and thermodynamic conditions are optimized, good smelting slag dephosphorization and desulfurization effects are obtained, molten steel and slag splashing in the smelting process is avoided, the distribution concentration of (MnO) in slag is effectively improved, the reduction of (MnO) in slag in the middle stage of smelting is promoted, the reoxidation of Mn in molten steel in the later stage of smelting is reduced, and the residual Mn content of molten steel in the end point is remarkably improved (0.35-0.55 wt%).
2. The method obviously improves the residual Mn content of the molten steel at the end point, reduces the addition of manganese alloy in the deoxidation alloying process, obviously reduces the consumption of steelmaking alloy and the alloying cost, promotes the improvement of the smelting technical and economic indexes, and improves the market competitiveness of products.
3. According to the invention, through the integrated innovation of a converter smelting loading process, an oxygen supply process, a slagging process, a temperature process, an end point control process, tapping slag washing and whole-process bottom argon blowing, good smelting slag dephosphorization and desulfurization effects are obtained, splashing in the smelting process is greatly reduced, the purposes of extracting carbon and retaining manganese in the converter smelting high-manganese high-silicon high-phosphorus iron water are realized, the C content of end-point molten steel is more than or equal to 0.10wt%, and the residual Mn content is 0.35-0.55 wt%.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to be limiting in any way, and any modifications or alterations based on the teachings of the present invention are intended to fall within the scope of the present invention.
The invention relates to a preparation method for extracting carbon and preserving manganese by smelting high-manganese high-silicon high-phosphorus iron water in a converter, which comprises the following process steps:
A. the smelting and charging process comprises the following steps: pouring out all final slag in the converter after the slag splashing is finished after the steel tapping of the upper furnace, and pouring out 150kg/t of slag according to the formula of 130-SteelThe scrap steel is added into a 50-ton LD converter according to the proportion; 940kg/t according to 920-SteelThe molten iron charging proportion is that the following high manganese, high silicon and high phosphorus molten iron is added into a 50-ton LD converter according to the following temperature and mass ratio: the temperature of the molten iron is more than or equal to 1290 ℃, the components of the molten iron comprise 4.5 to 5.2 weight percent of C, 0.70 to 1.00 weight percent of Si, 1.10 to 1.50 weight percent of Mn, 0.120 to 0.170 weight percent of P, less than or equal to 0.035 weight percent of S, and the balance of Fe and inevitable impurities;
B. the early smelting process comprises the following steps: step A, after high-manganese, high-silicon, high-phosphorus molten iron and cold scrap steel are filled into a 50-ton LD converter, the converter is shaken front and back to expose the molten iron, then the molten iron is blown to an oxygen lance, the ignition oxygen pressure is 0.80-0.90 MPa, the blowing is carried out for 20 seconds, the lance position of the oxygen lance is controlled according to 1.4-1.5m, the oxygen pressure is controlled according to 0.85MPa, and the oxygen pressure is controlled according to 7.2-9.2kg/tSteelAdding conventional active lime for slagging; blowing for 20-70 s, lowering the lance position of the oxygen lance to 0.9m, and controlling the oxygen pressure at 0.85MPa, respectively at 10.9-13.5kg/tSteel、9.2-12.5kg/tSteel、3.5kg/tSteelAdding conventional active lime, light-burned dolomite and magnesite balls for slagging according to the proportion of 0.9-1.7kg/tSteelAdding a slagging agent to promote slagging; blowing for 70-300 s, raising the lance position of the oxygen lance to 1.0m, controlling the oxygen pressure at 0.85MPa and controlling the oxygen pressure at 0.5-1.0 kg/tSteelIn an amount to add conventional iron ore coolant; blowing to 300-350 seconds, and controlling the lance position of the oxygen lance to be 1.1m, lifting the oxygen lance when the blowing time reaches 350 seconds, and shaking the converter to pour out partial early-stage slag;
C. the middle-stage smelting process comprises the following steps: b, after the converter is shaken to pour out partial early-stage slag, the converter is shaken forward and is continuously blown down by an oxygen lance for secondary slagging, the blowing is carried out for 380-420 seconds, the lance position of the oxygen lance is controlled to be 1.1m, the oxygen pressure is controlled to be 0.85MPa, and the oxygen pressure is respectively 9.0-12.0kg/tSteel、9.0-11.0kg/tSteelAdding conventional active lime and light burned dolomite, and performing secondary smelting and slagging according to the proportion of 0.8-1.5kg/tSteelAdding a slagging agent for slagging according to the amount of the raw materials; blowing for 750 seconds at 420 ℃ and 750 seconds, controlling the oxygen pressure at 0.85MPa and controlling the lance position of the oxygen lance to be 1.2 m; blowing for 750-plus 850 seconds, controlling the oxygen pressure at 0.85MPa, controlling the lance position of the oxygen lance to be 1.0m, pressing the lance position to the lance position of the oxygen lance for 0.8m, deep blowing for 30 seconds when blowing for 850 seconds, performing converter dumping sampling, and controlling the converter dumping molten steel temperature to be 1610-1630 ℃;
D. the final stage process of converter smelting: c, after the molten steel is poured out of the converter and sampled, swinging the converter to continue blowing by an oxygen lance, and blowing to 880 seconds-the end point tapping stage, wherein the oxygen pressure is controlled according to 0.85-0.90MPa, the lance position of the oxygen lance is controlled according to 0.8-0.9m, and the end point tapping molten steel temperature is controlled to be 1640-1660 ℃;
E. the converter tapping process comprises the following steps: d, adding active lime into the bottom of the steel ladle for washing before tapping of molten steel, wherein the addition amount of lime is 3.0kg/tSteel(ii) a A whole-process bottom argon blowing process is adopted in the tapping process, and the flow rate of argon is controlled to be 20-25 NL/min; finally, the smelting molten steel for extracting carbon and protecting manganese can be obtained.
The scrap steel in the step A comprises the following components in percentage by mass: 0.17-0.22wt% of C, 0.40-0.60wt% of Si, 1.25-1.46wt% of Mn, 0.036-0.050wt% of P, 0.035-0.048wt% of S, and the balance of Fe and inevitable impurities;
the slagging agent comprises the following components in percentage by mass: CaO 21.5%, Al2O37.6%，FeO 14.6%, Fe2O329.5%, MnO 5.4%, S0.15%, and the balance of Fe and inevitable impurities.
And B, pouring out the early slag of the part in the step B, namely pouring out the early slag of 1/3-2/3.
The composition of the converter molten steel in the step C is required to be 0.15-0.25wt% of C, 0.40-0.65wt% of Mn, less than or equal to 0.030wt% of P and less than or equal to 0.025wt% of S.
The components of the molten steel at the end point tapping in the step D are required to be 0.10-0.18wt% of C, less than or equal to 0.025wt% of P, 0.35-0.55wt% of Mn and less than or equal to 0.025wt% of S.
The smelting molten steel for extracting carbon and protecting manganese in the step E comprises the following components in percentage by weight: 0.10 to 0.18wt% of C, less than or equal to 0.025wt% of P, 0.35 to 0.55wt% of MnS, less than or equal to 0.022wt% of S, and the balance of Fe and inevitable impurities.
Example 1
A. The smelting and charging process comprises the following steps: pouring out all final slag in the converter after the slag splashing of the steel tapping of the upper furnace is finished, and pouring out the final slag according to the proportion of 130kg/tSteelThe steel scrap charging ratio is that the following steel scrap in mass ratio is added into a 50-ton LD converter: 0.17wt% of C, 0.40wt% of Si, 1.25wt% of Mn, 0.036wt% of P, 0.035wt% of S, and the balance of Fe and inevitable impurities; at 940kg/tSteelThe molten iron charging proportion is that the following high manganese, high silicon and high phosphorus molten iron is added into a 50-ton LD converter according to the following temperature and mass ratio: the temperature of molten iron is 1290 ℃, the components of the molten iron are C4.5wt%, Si0.70 wt%, Mn1.10 wt%, P0.120 wt%, S0.020 wt%, and the balance of Fe and inevitable impurities.
B. The early smelting process comprises the following steps: step A, after high-manganese, high-silicon, high-phosphorus molten iron and cold scrap steel are filled into a 50-ton LD converter, the converter is shaken front and back to expose the molten iron, then the molten iron is blown to an oxygen lance, the ignition oxygen pressure is 0.80-0.85 MPa, the blowing is carried out for 20 seconds, the lance position of the oxygen lance is controlled according to 1.4m, the oxygen pressure is controlled according to 0.85MPa, and the oxygen pressure is 7.2kg/tSteelAdding conventional active lime for slagging; blowing for 20-70 s, lowering the lance position of the oxygen lance to 0.9m, controlling the oxygen pressure at 0.85MPa, respectively at 10.9kg/tSteel、9.2kg/tSteel、3.5kg/tSteelAdding conventional active lime, light-burned dolomite and magnesite balls for slagging according to the amount of 0.9kg/tSteelAdding the following slag melting agents in percentage by mass to promote slag melting: CaO 21.5%, Al2O37.6%，FeO 14.6%, Fe2O329.5 percent, MnO 5.4 percent, S0.15 percent, and the balance of Fe and inevitable impurities; blowing for 70-300 s, raising the lance position of the oxygen lance to 1.0m, controlling the oxygen pressure at 0.85MPa and controlling the oxygen pressure at 0.5kg/tSteelIn an amount to add conventional iron ore coolant; blowing to 300-350 seconds, controlling the lance position of the oxygen lance to be 1.1m, and blowing to 350 secondsThe oxygen lance is lifted to shake down the converter to pour out partial early-stage slag.
C. The middle-stage smelting process comprises the following steps: b, after the converter is shaken to pour out partial early-stage slag, the converter is shaken to be right and is continuously blown down by an oxygen lance for secondary slagging, the blowing is carried out for 380-420 seconds, the lance position of the oxygen lance is controlled to be 1.1m, the oxygen pressure is controlled to be 0.85MPa, and the oxygen pressure is respectively 9.0kg/tSteel、9.0kg/tSteelAdding conventional active lime and light burned dolomite, and performing secondary smelting and slagging according to the proportion of 0.8kg/tSteelAdding the following slag melting agents in percentage by mass for melting slag: CaO 21.5%, Al2O37.6%，FeO 14.6%, Fe2O329.5 percent, MnO 5.4 percent, S0.15 percent, and the balance of Fe and inevitable impurities; blowing for 750 seconds at 420 ℃ and 750 seconds, controlling the oxygen pressure at 0.85MPa and controlling the lance position of the oxygen lance to be 1.2 m; blowing to 750-second, controlling the lance position to be 1.0m, controlling the oxygen pressure to be 0.85MPa, deeply blowing to 850 seconds to press the lance position (the lance position of the oxygen lance is 0.8 m) for 30 seconds to perform converter reversing sampling, and controlling the converter molten steel temperature to 1610 ℃, C0.15 wt%, Mn 0.40wt%, P0.020 wt% and S0.020 wt%.
D. The final stage process of converter smelting: c, after the molten steel is poured out of the furnace and sampled, the furnace is shaken to continue blowing by an oxygen lance, the blowing is carried out until 880 seconds and the end point tapping stage, the oxygen pressure is controlled according to 0.85-0.90MPa, the lance position of the oxygen lance is controlled according to 0.8m, and the control requirement of the end point tapping molten steel is as follows: the temperature is 1640 ℃, 0.10wt% of C, 0.017wt% of P, 0.35wt% of Mn and 0.018wt% of S.
E. The converter tapping process comprises the following steps: d, adding active lime into the bottom of the steel ladle for washing before tapping of molten steel, wherein the addition amount of lime is 3.0kg/tSteel(ii) a The whole bottom argon blowing process is adopted in the tapping process, and the flow rate of argon is controlled to be 20 NL/min; finally, obtaining the molten steel with the following weight percentages: 0.10wt% of C, 0.017wt% of P, 0.35wt% of Mn0.015wt% of S0.015wt% of Fe and inevitable impurities.
Example 2
A. The smelting and charging process comprises the following steps: pouring out all final slag in the converter after the slag splashing of the steel tapping of the upper furnace is finished, and pouring out the final slag according to the proportion of 140kg/tSteelThe steel scrap charging ratio is that the following steel scrap in mass ratio is added into a 50-ton LD converter: 0.20wt% of C, 0.50wt% of Si, 1.38wt% of Mn, 0.042wt% of P, 0.040wt% of S, and the balance of Fe and inevitable impuritiesAn agent; according to 930kg/tSteelThe molten iron charging proportion is that the following high manganese, high silicon and high phosphorus molten iron is added into a 50-ton LD converter according to the following temperature and mass ratio: the temperature of the molten iron is 1300 ℃, the components of the molten iron are C4.9wt%, Si 0.85wt%, Mn 1.30wt%, P0.145 wt%, S0.030wt%, and the balance of Fe and inevitable impurities.
B. The early smelting process comprises the following steps: step A, after high-manganese high-silicon high-phosphorus molten iron and cold scrap steel are filled into a 50-ton LD converter, the converter is shaken front and back to expose the molten iron, then the molten iron is blown to an oxygen lance, the ignition oxygen pressure is 0.80-0.90 MPa, the blowing is carried out for 20 seconds, the lance position of the oxygen lance is controlled according to 1.5m, the oxygen pressure is controlled according to 0.85MPa, and the oxygen pressure is 8.2kg/tSteelAdding conventional active lime for slagging; blowing for 20-70 s, lowering the lance position of the oxygen lance to 0.9m, controlling the oxygen pressure at 0.85MPa, respectively at 12.8kg/tSteel、10.8kg/tSteel、3.5kg/tSteelAdding conventional active lime, light-burned dolomite and magnesite balls for slagging according to the proportion of 1.3kg/tSteelAdding the following slag melting agents in percentage by mass to promote slag melting: CaO 21.5%, Al2O37.6%，FeO 14.6%, Fe2O329.5 percent, MnO 5.4 percent, S0.15 percent, and the balance of Fe and inevitable impurities; blowing for 70-300 s, raising the lance position of the oxygen lance to 1.0m, controlling the oxygen pressure at 0.85MPa and controlling the oxygen pressure at 0.8kg/tSteelIn an amount to add conventional iron ore coolant; blowing for 350 seconds to 300 and 1.1m, lifting the oxygen lance to shake the converter to pour out partial early-stage slag when blowing for 350 seconds.
C. The middle-stage smelting process comprises the following steps: b, after the converter is shaken to pour out partial early-stage slag, the converter is shaken to be right and is continuously blown down by an oxygen lance for secondary slagging, the blowing is carried out for 380-420 seconds, the lance position of the oxygen lance is controlled to be 1.1m, the oxygen pressure is controlled to be 0.85MPa, and the oxygen pressure is respectively 10.5kg/tSteel、10.0kg/tSteelAdding conventional active lime and light burned dolomite, and performing secondary smelting and slagging according to the proportion of 1.1kg/tSteelAdding the following slag melting agents in percentage by mass for melting slag: CaO 21.5%, Al2O37.6%，FeO 14.6%,Fe2O329.5 percent, MnO 5.4 percent, S0.15 percent, and the balance of Fe and inevitable impurities; blowing for 750 seconds at 420 ℃ and 750 seconds, controlling the oxygen pressure at 0.85MPa and controlling the lance position of the oxygen lance to be 1.2 m; blowing to 750-850 seconds, and controlling the lance position of the oxygen lanceThe pressure of oxygen is controlled at 0.85MPa, the converter is turned over and sampled when the pressure is blown to 850 seconds and the lance position (the lance position of the oxygen lance is 0.8 m) is deeply blown for 30 seconds, and the control requirement of the converter molten steel is as follows: the temperature was 1620 ℃, C0.20 wt%, Mn 0.52wt%, P0.025wt%, and S0.022wt%.
D. The final stage process of converter smelting: c, after the molten steel is poured out of the furnace and sampled, the furnace is shaken to continue blowing by an oxygen lance, the blowing is carried out until 880 seconds and the end point tapping stage, the oxygen pressure is controlled according to 0.85-0.90MPa, the lance position of the oxygen lance is controlled according to 0.9m, and the control requirement of the end point tapping molten steel is as follows: the temperature is 1650 ℃, C0.15 wt%, P0.022 wt%, Mn0.45wt%, S0.020 wt%.
E. The converter tapping process comprises the following steps: d, adding active lime into the bottom of the steel ladle for washing before tapping of molten steel, wherein the addition amount of lime is 3.0kg/tSteel(ii) a The whole bottom argon blowing process is adopted in the tapping process, and the flow rate of argon is controlled to be 23 NL/min; finally, obtaining the molten steel with the following weight percentages: 0.15wt% of C, 0.020wt% of P, 0.45wt% of Mn0.018 wt% of S and the balance of Fe and inevitable impurities.
Example 3
A. The smelting and charging process comprises the following steps: pouring out all final slag in the converter after the slag splashing of the steel tapping of the upper furnace is finished, and pouring out the final slag according to the proportion of 150kg/tSteelThe steel scrap charging ratio is that the following steel scrap in mass ratio is added into a 50-ton LD converter: 0.22wt% of C, 0.60wt% of Si, 1.46wt% of Mn, 0.050wt% of P, 0.048wt% of S and the balance of Fe and inevitable impurities; at 920kg/tSteelThe molten iron charging proportion is that the following high manganese, high silicon and high phosphorus molten iron is added into a 50-ton LD converter according to the following temperature and mass ratio: the temperature of molten iron is 1320 ℃, the components of the molten iron are C5.2wt%, Si 1.00wt%, Mn 1.50wt%, P0.170 wt%, S0.035wt%, and the balance of Fe and inevitable impurities.
B. The early smelting process comprises the following steps: step A, after high-manganese high-silicon high-phosphorus molten iron and cold scrap steel are filled into a 50-ton LD converter, the converter is shaken front and back to expose the molten iron, then the molten iron is blown to an oxygen lance, the ignition oxygen pressure is 0.80-0.90 MPa, the blowing is carried out for 20 seconds, the lance position of the oxygen lance is controlled according to 1.5m, the oxygen pressure is controlled according to 0.85MPa, and the oxygen pressure is 9.2kg/tSteelAdding conventional active lime for slagging; blowing for 20-70 s, lowering the lance position of the oxygen lance to 0.9m, controlling the oxygen pressure at 0.85MPa, respectively at 13.5kg/tSteel、12.5kg/tSteel、3.5kg/tSteelAmount of (2)Adding conventional active lime, light-burned dolomite and magnesite balls for slagging according to 1.7kg/tSteelAdding the following slag melting agents in percentage by mass to promote slag melting: CaO 21.5%, Al2O37.6%，FeO 14.6%, Fe2O329.5 percent, MnO 5.4 percent, S0.15 percent, and the balance of Fe and inevitable impurities; blowing for 70-300 s, raising the lance position of the oxygen lance to 1.0m, controlling the oxygen pressure at 0.85MPa and controlling the oxygen pressure at 1.0 kg/tSteelIn an amount to add conventional iron ore coolant; blowing for 350 seconds to 300 and 1.1m, lifting the oxygen lance to shake the converter to pour out partial early-stage slag when blowing for 350 seconds.
C. The middle-stage smelting process comprises the following steps: b, after the converter is shaken to pour out partial early-stage slag, the converter is shaken up and continues to be blown down by an oxygen lance for secondary slagging, the blowing is carried out for 380-420 seconds, the lance position of the oxygen lance is controlled to be 1.1m, the oxygen pressure is controlled to be 0.85MPa, and the oxygen pressure is respectively controlled to be 12.0kg/tSteel、11.0kg/tSteelAdding conventional active lime and light burned dolomite, and performing secondary smelting and slagging according to the proportion of 1.5kg/tSteelAdding the following slag melting agents in percentage by mass for melting slag: CaO 21.5%, Al2O37.6%，FeO 14.6%,Fe2O329.5 percent, MnO 5.4 percent, S0.15 percent, and the balance of Fe and inevitable impurities; blowing for 750 seconds at 420 ℃ and 750 seconds, controlling the oxygen pressure at 0.85MPa and controlling the lance position of the oxygen lance to be 1.2 m; blowing to 750-plus 850 seconds, controlling the lance position of the oxygen lance to be 1.0m, controlling the oxygen pressure to be 0.85MPa, pressing the lance position (the lance position of the oxygen lance is 0.8 m) to deeply blow for 30 seconds when blowing to 850 seconds, and performing converter reversing sampling, wherein the converter reversing molten steel control requirement is as follows: the temperature is 1630 ℃, C0.25 wt%, Mn 0.65wt%, P0.030 wt%, S0.025 wt%.
D. The final stage process of converter smelting: c, after the molten steel is poured out of the furnace and sampled, the furnace is shaken to continue blowing by an oxygen lance, the blowing is carried out until 880 seconds and the end point tapping stage, the oxygen pressure is controlled according to 0.85-0.90MPa, the lance position of the oxygen lance is controlled according to 0.9m, and the control requirement of the end point tapping molten steel is as follows: the temperature is 1660 ℃, C0.18 wt%, P0.025wt%, Mn 0.55wt%, S0.025 wt%.
E. The converter tapping process comprises the following steps: d, adding active lime into the bottom of the steel ladle for washing before tapping of molten steel, wherein the addition amount of lime is 3.0kg/tSteel(ii) a The whole bottom argon blowing process is adopted in the tapping process, and the flow rate of argon is controlled to be 25NL/min(ii) a Finally, obtaining the molten steel with the following weight percentages: 0.18wt% of C, 0.025wt% of P, 0.55wt% of Mn, 0.022wt% of S, and the balance Fe and inevitable impurities.
Claims (7)
1. A preparation method for extracting carbon and protecting manganese by smelting high-manganese high-silicon high-phosphorus iron water in a converter is characterized by comprising the following process steps:
A. the smelting and charging process comprises the following steps: pouring out all final slag in the converter after the slag splashing is finished after the steel tapping of the upper furnace, and pouring out 150kg/t of slag according to the formula of 130-SteelThe scrap steel is added into a 50-ton LD converter according to the proportion; 940kg/t according to 920-SteelThe molten iron charging proportion is that the following high manganese, high silicon and high phosphorus molten iron is added into a 50-ton LD converter: the temperature of the molten iron is more than or equal to 1290 ℃, the components of the molten iron comprise 4.5-5.2wt% of C, 0.70-1.00wt% of Si, 1.10-1.50wt% of Mn, 0.120-0.170wt% of P, less than or equal to 0.035wt% of S, and the balance of Fe and inevitable impurities;
B. the early smelting process comprises the following steps: step A, after high-manganese, high-silicon, high-phosphorus molten iron and cold scrap steel are filled into a 50-ton LD converter, the converter is shaken front and back to expose the molten iron, then the molten iron is blown to an oxygen lance, the ignition oxygen pressure is 0.80-0.90 MPa, the blowing is carried out for 20 seconds, the lance position of the oxygen lance is controlled according to 1.4-1.5m, the oxygen pressure is controlled according to 0.85MPa, and the oxygen pressure is controlled according to 7.2-9.2kg/tSteelAdding conventional active lime for slagging; blowing for 20-70 s, lowering the lance position of the oxygen lance to 0.9m, and controlling the oxygen pressure at 0.85MPa, respectively at 10.9-13.5kg/tSteel、9.2-12.5kg/tSteel、3.5kg/tSteelAdding conventional active lime, light-burned dolomite and magnesite balls for slagging according to the proportion of 0.9-1.7kg/tSteelAdding a slagging agent to promote slagging; blowing for 70-300 s, raising the lance position of the oxygen lance to 1.0m, controlling the oxygen pressure at 0.85MPa and controlling the oxygen pressure at 0.5-1.0 kg/tSteelIn an amount to add conventional iron ore coolant; blowing for 350 seconds to 300 and 1.1m, lifting the oxygen lance to shake the converter to pour out partial early-stage slag when blowing for 350 seconds;
C. the middle-stage smelting process comprises the following steps: b, after the converter is shaken to pour out partial early-stage slag, the converter is shaken forward and is continuously blown down by an oxygen lance for secondary slagging, the blowing is carried out for 380-420 seconds, the lance position of the oxygen lance is controlled to be 1.1m, the oxygen pressure is controlled to be 0.85MPa, and the oxygen pressure is respectively 9.0-12.0kg/tSteel、9.0-11.0kg/tSteelAdding conventional active lime and light burned dolomite, and performing secondary smelting and slagging according to the proportion of 0.8-1.5kg/tSteelAdding a slagging agent for slagging according to the amount of the raw materials; blowing for 750 seconds at 420 ℃ and 750 seconds, controlling the oxygen pressure at 0.85MPa and controlling the lance position of the oxygen lance to be 1.2 m; blowing for 750-plus 850 seconds, controlling the oxygen pressure at 0.85MPa, controlling the lance position of the oxygen lance to be 1.0m, pressing the lance position to the lance position of the oxygen lance for 0.8m, deep blowing for 30 seconds when blowing for 850 seconds, performing converter dumping sampling, and controlling the converter dumping molten steel temperature to be 1610-1630 ℃;
D. the final stage process of converter smelting: c, after the molten steel is poured out of the converter and sampled, swinging the converter to continue blowing by an oxygen lance, and blowing to 880 seconds-the end point tapping stage, wherein the oxygen pressure is controlled according to 0.85-0.90MPa, the lance position of the oxygen lance is controlled according to 0.8-0.9m, and the end point tapping molten steel temperature is controlled to be 1640-1660 ℃;
E. the converter tapping process comprises the following steps: d, adding active lime into the bottom of the steel ladle for washing before tapping of molten steel, wherein the addition amount of lime is 3.0kg/tSteel(ii) a A whole-process bottom argon blowing process is adopted in the tapping process, and the flow rate of argon is controlled to be 20-25 NL/min; finally, the smelting molten steel for extracting carbon and protecting manganese can be obtained.
2. The method for preparing high manganese, high silicon, high phosphorus and iron water-extracted carbon-preserved manganese by smelting in the converter according to claim 1, wherein the scrap steel in the step A comprises the following components in percentage by mass: 0.17-0.22wt% of C, 0.40-0.60wt% of Si, 1.25-1.46wt% of Mn1, 0.036-0.050wt% of P, 0.035-0.048wt% of S, and the balance of Fe and inevitable impurities.
3. The method for preparing the high manganese, high silicon and high phosphorus iron water-extracted carbon-retaining manganese by smelting the high manganese, high silicon and high phosphorus iron in the converter according to claim 1, wherein the slagging agent comprises the following components in percentage by mass: CaO 21.5%, Al2O37.6%，FeO 14.6%, Fe2O329.5%, MnO 5.4%, S0.15%, and the balance of Fe and inevitable impurities.
4. The method for extracting carbon from high-manganese high-silicon high-phosphorus iron and preserving manganese in the converter smelting according to claim 1, characterized in that the earlier slag of the pouring part in the step B is the earlier slag of the pouring 1/3-2/3.
5. The method for preparing high manganese, high silicon, high phosphorus and iron water-extracted carbon-retaining manganese by converter smelting according to claim 1, characterized in that the composition requirements of the converter molten steel in step C are C0.15-0.25 wt%, Mn 0.40-0.65wt%, P less than or equal to 0.030wt%, and S less than or equal to 0.025 wt%.
6. The method for preparing high manganese, high silicon, high phosphorus and iron water-extracted carbon-retaining manganese by converter smelting according to claim 1, wherein the composition requirements of the end-point tapping molten steel in the step D are that C is 0.10-0.18wt%, P is less than or equal to 0.025wt%, Mn is 0.35-0.55wt%, and S is less than or equal to 0.025 wt%.
7. The method for preparing high-manganese high-silicon high-phosphorus iron water-extracted carbon-preserved manganese by smelting in the converter according to claim 1, wherein the smelting molten steel for extracting carbon and preserving manganese in the step E comprises the following components in percentage by weight: 0.10 to 0.18wt% of C, less than or equal to 0.025wt% of P, 0.35 to 0.55wt% of MnS, less than or equal to 0.022wt% of S, and the balance of Fe and inevitable impurities.
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| CN110117689B (en) * | 2019-06-11 | 2020-07-31 | 北京科技大学 | Method for smelting low-phosphorus steel based on high-silicon molten iron converter double-slag method |
| CN112210638B (en) * | 2019-07-10 | 2022-03-11 | 山东钢铁股份有限公司 | Converter smelting method for medium and high silicon molten iron |
| CN110592461B (en) * | 2019-08-30 | 2022-03-04 | 石钢京诚装备技术有限公司 | Smelting method of alloy structural steel 45CrNi |
| CN112708719B (en) * | 2020-12-15 | 2022-03-15 | 安徽长江钢铁股份有限公司 | Converter steelmaking method by replacing full amount of scrap steel with iron slag |
| CN114622054B (en) * | 2022-03-04 | 2022-10-04 | 山东钢铁集团永锋临港有限公司 | Method for improving converter end-point manganese ratio |
| CN116103462A (en) * | 2023-02-27 | 2023-05-12 | 天铁热轧板有限公司 | Method for controlling splashing of steelmaking converter by utilizing oxygen lance |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS575808A (en) * | 1980-06-12 | 1982-01-12 | Sumitomo Metal Ind Ltd | Preparation of high manganese steel |
| JPH0517810A (en) * | 1991-07-12 | 1993-01-26 | Nippon Steel Corp | Refining method for high-mn steel |
| CN105543440A (en) * | 2015-12-30 | 2016-05-04 | 武钢集团昆明钢铁股份有限公司 | Decarbonization and manganese conservation converter smelting method for high manganese molten iron |
| CN106148629A (en) * | 2015-03-28 | 2016-11-23 | 鞍钢股份有限公司 | A kind of high ferromanganese water terminal Fe content control method |
| CN106811570A (en) * | 2015-12-02 | 2017-06-09 | 鞍钢股份有限公司 | A kind of smelting process of middle carbon high manganese steel |
| CN107779540A (en) * | 2016-08-31 | 2018-03-09 | 鞍钢股份有限公司 | A kind of converter list slag melting method of high-silicon molten iron |
-
2018
- 2018-09-30 CN CN201811154699.1A patent/CN109055649B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS575808A (en) * | 1980-06-12 | 1982-01-12 | Sumitomo Metal Ind Ltd | Preparation of high manganese steel |
| JPH0517810A (en) * | 1991-07-12 | 1993-01-26 | Nippon Steel Corp | Refining method for high-mn steel |
| CN106148629A (en) * | 2015-03-28 | 2016-11-23 | 鞍钢股份有限公司 | A kind of high ferromanganese water terminal Fe content control method |
| CN106811570A (en) * | 2015-12-02 | 2017-06-09 | 鞍钢股份有限公司 | A kind of smelting process of middle carbon high manganese steel |
| CN105543440A (en) * | 2015-12-30 | 2016-05-04 | 武钢集团昆明钢铁股份有限公司 | Decarbonization and manganese conservation converter smelting method for high manganese molten iron |
| CN107779540A (en) * | 2016-08-31 | 2018-03-09 | 鞍钢股份有限公司 | A kind of converter list slag melting method of high-silicon molten iron |
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