CN107354262B - Method for smelting high-phosphorus weathering steel from vanadium-extracting semisteel - Google Patents

Method for smelting high-phosphorus weathering steel from vanadium-extracting semisteel Download PDF

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CN107354262B
CN107354262B CN201710432507.8A CN201710432507A CN107354262B CN 107354262 B CN107354262 B CN 107354262B CN 201710432507 A CN201710432507 A CN 201710432507A CN 107354262 B CN107354262 B CN 107354262B
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steel
semisteel
vanadium
percent
slag
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CN107354262A (en
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孙福振
段希海
梁新维
康爱元
雷爱敏
潘爱龙
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HBIS Co Ltd Chengde Branch
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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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper

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  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
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  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention discloses a method for smelting high-phosphorus weathering steel from vanadium-extracting semisteel, which comprises the following steps: loading vanadium-extracting semisteel, scrap steel, nickel plates and copper plates into a steel-making converter; the adding amount of the scrap steel is controlled to be 6-8%; the vanadium extraction semisteel contains Si, Ti and Mn which are less than or equal to 0.10wt% and C which is 3.40-3.90 wt%, and the temperature is 1350-1400 ℃. The method is based on the fact that the contents of silicon, titanium and manganese in semisteel are traces, converter steelmaking is achieved through reducing the ratio of steel scrap entering a converter, the alkalinity of furnace slag and the adding amount of slag forming materials, controlling the gun position and the oxygen flow in the blowing process, improving the end point tapping temperature, discharging a proper amount of slag after tapping, and the like, and the purpose of high phosphorus content of molten steel at the end point of semisteel smelting weathering steel is achieved. The vanadium-containing molten iron in the method contains precious vanadium resources, and good conditions of less slag, less component slag system, decarburization and phosphorus conservation are created for smelting high-phosphorus weathering steel after desulfurization and vanadium extraction; through the control of the steelmaking technology, the self element resource of the vanadium-containing molten iron is utilized to meet the requirement of the content of P in the weathering steel, the use of the ferrophosphorus alloy is reduced, the alloy cost is effectively reduced, and the economic index of steelmaking is improved.

Description

Method for smelting high-phosphorus weathering steel from vanadium-extracting semisteel
Technical Field
The invention relates to a steelmaking method, in particular to a method for smelting high-phosphorus weathering steel from vanadium-extracting semisteel.
Background
The weathering steel has the characteristics of high-quality steel such as toughness, ductility, molding, welding and cutting, abrasion, high temperature, fatigue resistance and the like; meanwhile, the corrosion-resistant steel has the characteristics of corrosion resistance, long service life of the component, thinning, consumption reduction, labor saving, energy saving and the like. The steel structure is mainly used for steel structures of railways, vehicles, bridges, towers and the like which are exposed to the atmosphere for a long time; the method is used for manufacturing structural members such as containers, railway vehicles, oil derricks, harbor buildings, oil extraction platforms and the like; the weathering steel is a steel system which can be integrated with a modern metallurgy new mechanism, a new technology and a new process to lead the sustainable development and innovation of the weathering steel.
After elements such as phosphorus, copper, chromium, nickel and the like are added into the weathering steel, a compact protective film with strong adhesiveness is formed on the surface of the steel, so that the corrosion is prevented from diffusing and developing inwards, and a substrate below the rust layer is protected to slow down the corrosion speed. In some steel plants such as steel bearing plants, molten iron contains precious vanadium resources, vanadium extraction treatment is carried out before smelting to obtain semisteel with silicon, titanium and manganese contents as traces, and therefore, how to adopt the vanadium extraction semisteel to smelt the weathering steel has important significance.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for smelting high-phosphorus weathering steel from vanadium extraction semisteel with low cost.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: (1) loading vanadium-extracting semisteel, scrap steel, nickel plates and copper plates into a steel-making converter; the adding amount of the scrap steel is controlled to be 6-8% of that of the semisteel; si, Ti and Mn in the vanadium extraction semisteel are less than or equal to 0.10wt%, C is 3.40-3.90 wt%, and the temperature is 1350-1400 ℃;
(2) the blowing process adopts a low lance position mode, the lance positions at the early stage and the later stage are controlled to be 1.1-1.3 m, the lance position at the middle stage is controlled to be 1.4-1.6 m, and the oxygen flow is controlled to be 26000-28000 m 3/h；
(3) Adding slag making materials, controlling the light-burned dolomite to be 10-20 kg/t, controlling the lime to be 2-5 kg/t, adding 60-70 wt% of the total amount of the slag materials at the early stage, and adding 30-40 wt% of the total amount of the slag materials at the middle and later stages;
(4) controlling the content of C at 0.04-0.06% at the blowing end point, controlling the temperature at 1650-1680 ℃, stopping oxygen supply when the lance is started, and tapping;
(5) adding 400-500 kg of premelted refining slag and 400-500 kg of lime in the tapping process, then carrying out deoxidation alloying, blowing argon in the whole process for stirring, finally carrying out slag stopping and tapping, and carrying out slag discharging according to the control of the P content of the molten steel at the end point.
In the step (3), the technical indexes of the light burned dolomite are as follows: MgO is more than or equal to 29wt%, CaO is more than or equal to 41wt%, S is less than or equal to 0.080wt%, and the granularity is 5-50 mm; the technical indexes of lime are as follows: CaO + MgO is greater than or equal to 86wt%, CaO is greater than or equal to 81wt%, and SiO 2Less than or equal to 3.00wt%, P less than or equal to 0.020wt%, S less than or equal to 0.080wt%, and activityThe degree is more than or equal to 300ml, and the granularity is 30-60 mm.
In the step (4), when the content of C is 0.30-0.40 wt% according to a secondary dynamic model in the later stage of blowing, a sublance TSC probe is used for measuring the temperature and the carbon content of molten steel in the furnace.
In the step (1), the vanadium extraction semisteel is obtained by carrying out desulfurization pretreatment and vanadium extraction on vanadium-containing molten iron; and (4) performing desulfurization pretreatment until the content of S is less than or equal to 0.015 wt%.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: based on the fact that the contents of silicon, titanium and manganese in semisteel are traces, the aim of high phosphorus content of molten steel at the end point of semisteel smelting weathering steel is achieved by measures of reducing the ratio of steel scrap entering a converter, the alkalinity of furnace slag and the addition amount of slag-forming materials, controlling the gun position and the oxygen flow in the blowing process, improving the end point tapping temperature, properly discharging slag after tapping and the like. The vanadium-containing molten iron contains precious vanadium resources, and good conditions of less slag, less component slag system, decarburization and phosphorus conservation are created for smelting high-phosphorus weathering steel after desulfurization and vanadium extraction; through the control of the steelmaking technology, the self element resource of the vanadium-containing molten iron is utilized to meet the requirement of the content of the weathering steel [ P ], the use of the ferrophosphorus alloy is reduced, the alloy cost is effectively reduced, and the economic index of steelmaking is improved.
Detailed Description
In the method for smelting the high-phosphorus weathering steel from the vanadium extraction semisteel, the internal control range of the components of the high-phosphorus weathering steel is as follows: 0.07-0.10% of C, 0.070-0.110% of P, less than or equal to 0.012% of S, 0.25-0.45% of Si, 0.40-0.50% of Mn, 0.10-0.20% of Ni, 0.25-0.35% of Cu, 0.40-0.60% of Cr, 0.01-0.04% of ALs, and the balance of Fe and inevitable impurities; the specific steps and control parameters are as follows:
(1) the vanadium-containing molten iron conditions are as follows (wt): 3.85-4.86% of C, 0.10-0.29% of Si, 0.08-0.25% of Ti, 0.23-0.45% of Mn, 0.121-0.204% of P, 0.025-0.079% of S, 0.190-0.278% of V, 1312-1396 ℃, and by molten iron desulphurization pretreatment, the content of target S is controlled to be less than or equal to 0.015%, the desulphurization burden is reduced for a converter and refining, the exposed area of the liquid level of the ladle after slag skimming is more than or equal to 90%, and resulfurization in the processes of vanadium extraction and steelmaking is reduced.
(2) After vanadium extraction is carried out on molten iron, the [ Si ] + [ Ti ] + [ Mn ] in the semi-steel is controlled to be less than or equal to 0.10wt%, the [ C ] is controlled to be 3.40-3.90 wt%, and the temperature is controlled to be 1350-1400 ℃. After vanadium extraction is carried out on molten iron, Si, Ti and Mn elements are oxidized into trace elements, C elements are partially oxidized, the temperature is increased, slagging constituent elements are reduced during smelting, and conditions are created for decarburization and phosphorus conservation.
(3) Taking a 120-ton steel-making converter as an example, the loading amount of semisteel is 130-135 t, scrap steel mainly comprises thread cutting heads, blanks and the like, nickel plates and copper plates are added along with the scrap steel, and the amount of the scrap steel is 6-8% of the weight of the semisteel, so that less scrap steel ensures the temperature of molten steel with a higher end point, and is not beneficial to the dephosphorization reaction according to the thermodynamic principle.
(4) The blowing process adopts a low lance position mode, the lance positions at the early stage and the later stage are controlled to be 1.1-1.3 m, the lance position at the middle stage is controlled to be 1.4-1.6 m, and the oxygen flow is controlled to be 26000-28000 m 3H is used as the reference value. In the process, the lower lance position in the early stage is quickly heated, and the higher lance position in the middle stage is because the carbon-oxygen reaction is violent, so that the scouring erosion of the furnace lining by the 'back-dry' oxygen stream is avoided.
(5) The slag forming material is added in a less slag mode, light-burned dolomite is controlled to be 10-20 kg/t of tapping molten steel, lime is controlled to be 2-5 kg/t of tapping molten steel, 60-70% of the total amount of slag materials are added in the early stage, and the rest 30-40% of the slag materials are added in the middle and later stages. The light-burned dolomite of the slagging material contains MgO and CaO, and plays a role in slagging and furnace protection. The technical indexes of the light-burned dolomite are as follows: MgO is more than or equal to 29wt%, CaO is more than or equal to 41wt%, S is less than or equal to 0.080wt%, and the granularity is 5-50 mm; the technical indexes of lime are as follows: CaO + MgO is greater than or equal to 86wt%, CaO is greater than or equal to 81wt%, and SiO 2Less than or equal to 3.00wt%, P less than or equal to 0.020wt%, S less than or equal to 0.080wt%, activity degree more than or equal to 300ml, and granularity of 30-60 mm.
(6) And in the later stage of blowing, when the content [ C ] is 0.30-0.40 wt% according to the secondary dynamic model, measuring the temperature and the carbon content of molten steel in the furnace by using a TSC probe of the sublance, correcting the temperature and the carbon in the secondary dynamic model, and adjusting the temperature of the molten steel to create conditions for controlling the temperature and the carbon content of the molten steel at the end point. Controlling the content of [ C ] to be 0.04-0.06 wt%, controlling the temperature to be 1650-1680 ℃, starting the lance to stop supplying oxygen, measuring the temperature of molten steel in the furnace, the carbon content and the oxygen content by using a sublance TSO probe, sampling, and tapping after the component assay of the molten steel is finished.
(7) 400-500 kg of pre-melted refining slag, 400-500 kg of lime, calcium carbide, aluminum, silicon-manganese alloy, ferrosilicon, low-carbon ferrochrome and the like are added in the tapping process to complete deoxidation alloying, argon is blown in the whole process for stirring, the components of molten steel are uniform, a tapered grooved slag-blocking mark is used for slag blocking in the later period, slag completely discharged from the molten steel flows out from the slag-blocking mark groove, and proper amount of slag is controlled according to the content of molten steel [ P ] at the terminal point to be close to or reach the target content of [ P ].
(8) And after tapping, measuring the temperature by an argon blowing station, taking a molten steel sample, sending the molten steel sample to a laboratory for analysis, covering a steel ladle, and hoisting to LF refining for component fine adjustment, inclusion removal and other treatment.
Example 1: the method for smelting the high-phosphorus weathering steel from the vanadium-extracting semisteel adopts the following specific process.
A desulfurization pretreatment procedure: in the desulfurization process of a 120-ton system, the main components of molten iron are as follows: 4.46 percent of C, 0.18 percent of Si, 0.16 percent of Ti0.32 percent of Mn, 0.178 percent of P, 0.031 percent of S and 0.258 percent of V, the temperature is 1346 ℃, the S is controlled to be 0.007 percent through the molten iron desulphurization pretreatment, and the exposed area of the molten iron after slagging-off is more than or equal to 90 percent.
A vanadium extraction procedure: vanadium extraction is carried out on desulfurized molten iron, and the main components of semisteel are as follows: 3.72 percent of C, 0.02 percent of Si, 0.01 percent of Ti, 0.05 percent of Mn0.08 percent of [ Si ] + [ Ti ] + [ Mn ] =0.08 percent of P0.175 percent of S0.011 percent of temperature 1356 ℃.
A converter process: the charging amount of semisteel in a 120-ton steelmaking converter is 132t, the scrap steel is 8t, the lance position at the early stage of converting is 1.3m, 1300kg of slag making materials for light burning of dolomite and 300kg of lime are added, the lance position at the middle stage is 1.6m, and the oxygen flow is 28000m 3The later stage gun position is 1.1m, 500kg of slag making material light-burned dolomite and 200kg of lime are added; the total amount of the light calcined dolomite is 1800kg, the steel tapping amount is less than the loading amount by about 10 percent due to blowing loss in the smelting process, 125 tons of steel are tapped, and 1800/125=14.4kg/t of steel tapping molten steel is tapped; the lime addition amount is 500/125=4kg/t tapping molten steel; in the later stage of converting according to two-stage dynamic model in [ C ]]When the content is 0.30%, measuring the temperature and carbon content of the molten steel in the furnace to be 0.32% and the temperature to be 1586 ℃ by using a TSC probe of a sublance, correcting the temperature and carbon in a secondary dynamic model, and [ C ]]The carbon content of the molten steel in the furnace is measured to be 0.038 percent by using a sublance TSO probe, the temperature is 1658 ℃ and the oxygen content is 724ppmAnd sampling and analyzing the molten steel with the components of C0.045% and P0.068%, and tapping. 400kg of premelted refining slag, 500kg of lime, calcium carbide, aluminum, silicon-manganese alloy, ferrosilicon, low-carbon ferrochrome and the like are added in the tapping process to complete deoxidation alloying, argon is blown in the whole process for stirring, the molten steel components are uniform, and the slag-stopping mark with the conical groove is used for successfully stopping the slag because of the P in the molten steel]Controlling proper amount of slag when the content does not reach the target value, blowing argon to an argon blowing station after tapping, measuring the temperature, and taking a steel water sample for analysis [ P ]]The content is 0.085%, after the steel ladle is covered, the steel ladle is hoisted to LF for fine adjustment of components, removal of impurities and other treatments. After refining, the obtained high-phosphorus weathering steel comprises the following main components (wt): 0.08% of C, 0.085% of P, 0.004% of S, 0.32% of Si, 0.45% of Mn0.16% of Ni, 0.29% of Cu, 0.52% of Cr and 0.022% of ALs.
Example 2: the method for smelting the high-phosphorus weathering steel from the vanadium-extracting semisteel adopts the following specific process.
A desulfurization pretreatment procedure: in the desulfurization process of a 120-ton system, the main components of molten iron are as follows: 4.37 percent of C, 0.21 percent of Si, 0.12 percent of Ti0.12 percent of Mn, 0.33 percent of P, 0.157 percent of S, 0.030 percent of V, 0.246 percent of V, the temperature of 1338 ℃, the [ S ] is controlled to be 0.005 percent through the molten iron desulphurization pretreatment, and the exposed area of the molten iron after slag skimming is more than or equal to 90 percent.
A vanadium extraction procedure: vanadium extraction is carried out on desulfurized molten iron, and the main components of semisteel are as follows: 3.68 percent of C, 0.03 percent of Si, 0.01 percent of Ti, 0.06 percent of Mn0.06 percent, 0.10 percent of [ Si ] + [ Ti ] + [ Mn ] =0.10 percent of P0.155 percent of S0.010 percent and the temperature of 1350 ℃.
A converter process: the charging amount of semisteel in a 120-ton steelmaking converter is 130t, the scrap steel is 10.4t, the lance position at the early stage of converting is 1.2m, 1200kg of slag making material light-burned dolomite and 200kg of lime are added, the lance position at the middle stage is 1.5m, and the oxygen flow is 28000m 3The later stage gun position is 1.1m, 500kg of slag making material light-burned dolomite and 200kg of lime are added; the addition amount of the light calcined dolomite is 1700/125=13.6kg/t molten steel tapping; the lime addition amount is 400/125=3.2kg/t tapping molten steel; in the later stage of converting according to two-stage dynamic model in [ C ]]When the content is 0.35%, measuring the temperature and carbon content of molten steel in the furnace to be 0.37% by using a sublance TSC probe, measuring the temperature to be 1592 ℃, correcting the temperature and carbon in a secondary dynamic model, [ C%]The content is 0.05 percent, the temperature is 1673 ℃, oxygen supply is stopped when the lance is started, the carbon content of the molten steel in the furnace is measured to be 0.048 percent by using a sublance TSO probe, and the temperature is 1673 DEG1668 ℃, has oxygen content of 633ppm, samples and analyzes molten steel components to be C0.044 percent and P0.078 percent, and tapping is carried out. 400kg of premelted refining slag, 500kg of lime, calcium carbide, aluminum, silicon-manganese alloy, ferrosilicon, low-carbon ferrochrome and the like are added in the tapping process to complete deoxidization alloying, argon is blown in the whole process for stirring, molten steel components are homogenized, a tapered groove slag-blocking mark is used for successfully blocking slag, after tapping is finished, an argon blowing station is started for blowing argon, temperature measurement is carried out, and a steel water sample is taken for analysis [ P]The content is 0.082%, after the ladle is covered, hanging to LF for refining, and removing impurities. After refining, the obtained high-phosphorus weathering steel mainly comprises the following components: 0.08 percent of C, 0.082 percent of P, 0.003 percent of S, 0.35 percent of Si, 0.44 percent of Mn, 0.155 percent of Ni, 0.31 percent of Cu, 0.53 percent of Cr and 0.025 percent of ALs.
Example 3: the method for smelting the high-phosphorus weathering steel from the vanadium-extracting semisteel adopts the following specific process.
A desulfurization pretreatment procedure: in the desulfurization process of a 120-ton system, the main components of molten iron are as follows: 4.35 percent of C, 0.17 percent of Si, 0.13 percent of Ti0.13 percent of Mn, 0.29 percent of P, 0.041 percent of S, 0.232 percent of V, the temperature of 1346 ℃, and the [ S ] is controlled to be 0.015 percent through the molten iron desulphurization pretreatment, and the exposed area of the molten iron after slag skimming is more than or equal to 90 percent.
A vanadium extraction procedure: vanadium extraction is carried out on desulfurized molten iron, and the main components of semisteel are as follows: 3.40 percent of C, 0.01 percent of Si, 0.01 percent of Ti, 0.04 percent of Mn0.06 percent of [ Si ] + [ Ti ] + [ Mn ] =0.06 percent of P0.162 percent of S0.019 percent of the temperature 1390 ℃.
A converter process: the charging amount of semisteel in a 120-ton steelmaking converter is 133t, the scrap steel is 8t, the lance position at the early stage of converting is 1.3m, 1200kg of slagging material light-burned dolomite and 300kg of lime are added, the lance position at the middle stage is 1.6m, and the oxygen flow is 27000m 3The later stage gun position is 1.2m, 600kg of slag making material light-burned dolomite and 200kg of lime are added; the addition amount of the light calcined dolomite is 1800/125=14.4kg/t molten steel tapping; the lime addition amount is 500/125=4kg/t tapping molten steel; in the later stage of converting according to two-stage dynamic model in [ C ]]When the content is 0.40%, measuring the temperature and carbon content of molten steel in the furnace to be 0.43% and the temperature to be 1582 ℃ by using a sublance TSC probe, correcting the temperature and carbon in a secondary dynamic model, [ C]The carbon content of the molten steel in the furnace is measured to be 0.055 percent, the temperature is 1672 ℃, the oxygen content is 568ppm by using a sublance TSO probe, and the molten steel is sampled and analyzedThe components of C0.056% and P0.088% are tapped. 400kg of premelted refining slag, 500kg of lime, calcium carbide, aluminum, silicon-manganese alloy, ferrosilicon, low-carbon ferrochrome and the like are added in the tapping process to complete deoxidization alloying, argon is blown in the whole process for stirring, molten steel components are homogenized, a tapered groove slag-blocking mark is used for successfully blocking slag, after tapping is finished, an argon blowing station is started for blowing argon, temperature measurement is carried out, and a steel water sample is taken for analysis [ P]The content is 0.095%, after the steel ladle is covered, the steel ladle is hoisted to LF for fine adjustment of components, removal of impurities and other treatments. After refining, the obtained high-phosphorus weathering steel mainly comprises the following components: 0.085 percent of C, 0.094 percent of P, 0.002 percent of S, 0.33 percent of Si, 0.44 percent of Mn, 0.155 percent of Ni, 0.31 percent of Cu0.48 percent of Cr and 0.024 percent of ALs.
Example 4: the method for smelting the high-phosphorus weathering steel from the vanadium-extracting semisteel adopts the following specific process.
A desulfurization pretreatment procedure: in the desulfurization process of a 120-ton system, the main components of molten iron are as follows: 4.03 percent of C, 0.26 percent of Si, 0.08 percent of Ti0.08 percent of Mn, 0.38 percent of P, 0.134 percent of S, 0.061 percent of V, 0.278 percent of V, 1375 ℃, and controlling the [ S ] to be 0.013 percent through molten iron desulphurization pretreatment, and the exposed area of the molten iron after slagging-off is more than or equal to 90 percent.
A vanadium extraction procedure: vanadium extraction is carried out on desulfurized molten iron, and the main components of semisteel are as follows: 3.90 percent of C, 0.02 percent of Si, 0.02 percent of Ti, 0.05 percent of Mn0.09 percent of [ Si ] + [ Ti ] + [ Mn ] =0.09 percent of P0.172 percent of S0.017 percent of and the temperature of 1372 ℃.
A converter process: the charging amount of semisteel in a 120-ton steelmaking converter is 131.6t, the charging amount of scrap steel is 8.4t, the lance position at the early stage of converting is 1.1m, 800kg of slag making material light-burned dolomite and 325kg of lime are added, the lance position at the middle stage is 1.4m, and the oxygen flow is 26000m 3The later stage gun position is 1.1m, 450kg of slagging material light-burned dolomite and 300kg of lime are added; the addition amount of the light calcined dolomite is 1250/125=10kg/t molten steel tapping; the lime addition amount is 625/125=5kg/t tapping molten steel; in the later stage of converting according to two-stage dynamic model in [ C ]]When the content is 0.32%, the temperature and the carbon content of the molten steel in the furnace are measured to be 0.35% and 1562 ℃ by using a TSC probe of a sublance, the temperature and the carbon in a secondary dynamic model are corrected, and the product [ C ]]When the content is 0.05 percent and the temperature is 1650 ℃, the lance is started and oxygen supply is stopped, a sublance TSO probe is used for measuring the carbon content of molten steel in the furnace to be 0.047 percent, the temperature to be 1644 ℃ and the oxygen content to be 592ppm, and the molten steel is sampled and analyzed to have the components of C0.052 percent and P0.084 percent to be tapped.450kg of premelted refining slag, 480kg of lime, calcium carbide, aluminum, silicon-manganese alloy, ferrosilicon, low-carbon ferrochrome and the like are added in the tapping process to complete deoxidation alloying, argon blowing and stirring are carried out in the whole process, the molten steel components are homogenized, a tapered groove slag-blocking mark is used for successfully blocking slag, and argon blowing, temperature measurement and steel water sample analysis are carried out in an argon blowing station [ P]The content is 0.089%, after the steel ladle is covered, the steel ladle is hoisted to LF for fine adjustment of components, removal of impurities and other treatments. After refining, the obtained high-phosphorus weathering steel mainly comprises the following components: c0.082%, P0.090%, S0.006%, Si 0.35%, Mn0.45%, Ni 0.15%, Cu 0.30%, Cr0.51%, ALs 0.021%.
Example 5: the method for smelting the high-phosphorus weathering steel from the vanadium-extracting semisteel adopts the following specific process.
A desulfurization pretreatment procedure: in the desulfurization process of a 120-ton system, the main components of molten iron are as follows: 4.72 percent of C, 0.14 percent of Si, 0.22 percent of Ti0.27 percent of Mn, 0.145 percent of P, 0.038 percent of S, 0.208 percent of V, the temperature of 1329 ℃, the [ S ] is controlled to be 0.010 percent through the molten iron desulphurization pretreatment, and the exposed area of the molten iron after slagging-off is more than or equal to 90 percent.
A vanadium extraction procedure: vanadium extraction is carried out on desulfurized molten iron, and the main components of semisteel are as follows: 3.57 percent of C, 0.02 percent of Si, 0.02 percent of Ti, 0.04 percent of Mn0.07 percent of [ Si ] + [ Ti ] + [ Mn ] =0.07 percent of P0.164 percent of S0.018 percent of temperature 1400 ℃.
A converter process: the charging amount of semisteel in a 120-ton steelmaking converter is 132t, the scrap steel is 10t, the lance position at the early stage of converting is 1.2m, 1800kg of slagging material light-burned dolomite and 125kg of lime are added, the lance position at the middle stage is 1.5m, and the oxygen constant flow is 28000m 3The later stage gun position is 1.3m, 700kg of slag-making material light-burned dolomite and 125kg of lime are added; the addition amount of the light calcined dolomite is 2500/125=20kg/t molten steel tapping; the lime addition amount is 250/125=2kg/t tapping molten steel; in the later stage of converting according to two-stage dynamic model in [ C ]]When the content is 0.37 percent, measuring the temperature and the carbon content of the molten steel in the furnace to be 0.38 percent and the temperature to be 1575 ℃ by using a TSC probe of a sublance, correcting the temperature and the carbon in a secondary dynamic model, [ C]Tapping after the content is 0.06%, the temperature is 1658 ℃, oxygen supply is stopped when the lance is started, the carbon content of molten steel in the furnace is measured to be 0.055% by using a sublance TSO probe, the temperature is 1651 ℃, the oxygen content is 678ppm, and the molten steel is sampled and analyzed to be 0.058% and P0.074%. 500kg of premelted refining slag and 400kg of lime are added in the tapping process,the method comprises the steps of completing deoxidation alloying of calcium carbide, table aluminum, silicon-manganese alloy, ferrosilicon, low-carbon ferrochrome and the like, blowing argon and stirring in the whole process, homogenizing molten steel components, successfully pushing off slag by using a conical grooved slag-stopping mark, blowing argon to an argon blowing station, measuring temperature, taking a steel water sample for analysis [ P]The content is 0.080%, and after the steel ladle is covered with a cover, the steel ladle is hung to LF for refining, and treatment such as component fine adjustment, inclusion removal and the like is carried out. After refining, the obtained high-phosphorus weathering steel mainly comprises the following components: 0.084% of C, 0.080% of P, 0.005% of S, 0.31% of Si, 0.45% of Mn, 0.157% of Ni, 0.29% of Cu, 0.53% of Cr and 0.018% of ALs.

Claims (4)

1. A method for smelting high-phosphorus weathering steel from vanadium extraction semisteel is characterized by comprising the following steps: (1) loading vanadium-extracting semisteel, scrap steel, nickel plates and copper plates into a steel-making converter; the adding amount of the scrap steel is controlled to be 6-8% of that of the semisteel; si, Ti and Mn in the vanadium extraction semisteel are less than or equal to 0.10wt%, C is 3.68-3.90 wt%, and the temperature is 1350-1400 ℃;
(2) the blowing process adopts a low lance position mode, the lance positions at the early stage and the later stage are controlled to be 1.1-1.3 m, the lance position at the middle stage is controlled to be 1.4-1.6 m, and the oxygen flow is controlled to be 26000-28000 m 3/h；
(3) Adding slag making materials, controlling the light-burned dolomite to be 10-20 kg/t, controlling the lime to be 2-5 kg/t, adding 60-70% of the total amount of the slag materials in the early stage, and adding 30-40% of the total amount of the slag materials in the middle and later stages;
(4) controlling the content of C at 0.04-0.06% at the blowing end point, controlling the temperature at 1650-1680 ℃, stopping oxygen supply when the lance is started, and tapping;
(5) adding 400-500 kg of premelted refining slag and 400-500 kg of lime in the tapping process, then adding calcium carbide, aluminum, silicon-manganese alloy, ferrosilicon and low-carbon ferrochrome for deoxidation alloying, blowing argon for stirring in the whole process, finally carrying out slag blocking and tapping, and carrying out slag tapping according to the control of the content of molten steel P at the end point.
2. The method for smelting the high-phosphorus weathering steel from the vanadium extraction semisteel according to claim 1, characterized by comprising the following steps: in the step (3), the technical indexes of the light calcined dolomite are as follows: MgO is more than or equal to 29wt%, CaO is more than or equal to 41wt%, S is less than or equal to 0.080wt%, and the granularity is 5-50 mm; the technical indexes of lime are as follows: CaO + MgO is greater than or equal to 86wt%, CaO is greater than or equal to 81wt%, and SiO 2Less than or equal to 3.00wt%, P less than or equal to 0.020wt%, S less than or equal to 0.080wt%, activity degree more than or equal to 300ml, and granularity of 30-60 mm.
3. The method for smelting the high-phosphorus weathering steel from the vanadium extraction semisteel according to claim 1, characterized by comprising the following steps: in the step (4), when the content of C is 0.30-0.40 wt% in the later stage of blowing according to the secondary dynamic model, the temperature of molten steel in the furnace and the content of carbon are measured by using a TSC probe of a sublance.
4. The method for smelting high-phosphorus weathering steel from vanadium-extracted semisteel according to claim 1, 2 or 3, characterized in that: in the step (1), the vanadium extraction semisteel is obtained by carrying out desulfurization pretreatment and vanadium extraction on vanadium-containing molten iron; and (4) performing desulfurization pretreatment until the content of S is less than or equal to 0.015 wt%.
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