CN100560742C - Be used for controlling the processing method that the steel trace element accurately adds - Google Patents
Be used for controlling the processing method that the steel trace element accurately adds Download PDFInfo
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- CN100560742C CN100560742C CNB2008100123627A CN200810012362A CN100560742C CN 100560742 C CN100560742 C CN 100560742C CN B2008100123627 A CNB2008100123627 A CN B2008100123627A CN 200810012362 A CN200810012362 A CN 200810012362A CN 100560742 C CN100560742 C CN 100560742C
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Abstract
The present invention relates to a kind of furnace outer refining technology of steel-making, be particularly related to a kind of processing method that the steel trace element accurately adds that is used for controlling, may further comprise the steps: a, first deoxidation: first steel-making water in the converter, in tapping process, add reductor and carry out deoxidation just in ladle, the add-on of reductor is 1.5～3.5kg/t; B, deep deoxidation: add aluminium after first deoxidation finishes molten steel is carried out deep deoxidation, and sour molten aluminium in the molten steel is controlled at 0.02～0.04%; C, refining: ladle is transported to LF, RH, CAS-OB or VD station carry out refining; The adding of d, composite sphere: ladle is transported to the RH station, adds composite sphere from the tremie pipe of RH downtake heteropleural; E, continuous casting: continuous casting adopts whole process protection.The present invention can significantly improve that trace element is stable and effectively reclaim in steel, and recovery rate can reach 70%～90%, and saves cost, makes things convenient for easy handling.
Description
Technical field
The present invention relates to a kind of furnace outer refining technology of steel-making, particularly a kind of being used for controlled the processing method that the steel trace element accurately adds, and belongs to metallurgical technology field.
Background technology
Some trace elements are remarkable for the mechanical property effect that improves material in the steel.As boron or rare earth etc., at some engineering machinery steel is to improve its hardening capacity, often in steel, add a spot of boron, and rare earth can crystal grain thinning, purify crystal boundary, change attribute, size, quantity and the distribution of nonmetallic inclusionsin steel, thereby significantly improve the obdurability and the corrosion resistance nature of steel.
For the production of boron steel because the chemical property of boron is very active, in alloying process very easily with steel in element reactions such as oxygen, nitrogen, thereby cause the recovery rate of boron lower and recovery rate is unstable.In addition, because rare earth element itself has extremely strong chemically reactive, more accurately the content of rare earth in the control material also be contain rare earth steel and metallic substance apply in vital gordian technique, just because of the add-on of rare earth element and boron is wayward, each iron and steel enterprise and user thereof can't formulate the trade mark of steel or other material with arm's length standard by boron in the steel or in the material or ree content, only stipulate in the steel or the add-on of boron or rare earth element in the material, international academia various performances and boron or ree content in discussing boron steel or rare earth steel have substantial connection.In this case, the technical barrier that micronutrient levelss such as boron, rare earth accurately add in the control steel that needs to be resolved hurrily.
Summary of the invention
The present invention is directed to that above-mentioned problems of the prior art propose, its objective is provide a kind of be applicable in the refining process to trace alloying element in the steel add accurately, stablize the CONTROL PROCESS method, adopt method of the present invention to the accurate recovery rate of trace alloying element adding in the steel 70%～90%.
In order to solve the problems of the technologies described above, the present invention is achieved in that and is used for controlling the processing method that the steel trace element accurately adds, may further comprise the steps: a, first deoxidation: first steel-making water in the converter, in tapping process, add reductor and carry out deoxidation just in ladle, the add-on of reductor is 1.5～3.5kg/t; B, deep deoxidation: add aluminium after first deoxidation finishes molten steel is carried out deep deoxidation, and sour molten aluminium in the molten steel is controlled at 0.02～0.04%; C, refining: ladle is transported to LF, RH, CAS-OB or VD station carry out refining; The adding of d, composite sphere: ladle is transported to the RH station, adds composite sphere from the tremie pipe of RH downtake heteropleural; E, continuous casting: continuous casting adopts whole process protection.
The described aluminium that adds, its adding mode is for feeding aluminum steel or adding in the aluminum shot any one, and the add-on of aluminium is 0.10～0.40kg/t.
Described refining, in its refining slag the total amount of FeO and MnO less than 10%, α in the molten steel
[O]Less than 5 * 10
-5
The adding of described composite sphere, RH stove vacuum tightness should remain on below the 500pa.
The adding of described composite sphere, it need carry out circular treatment after adding, and clean cycling time is at 0.1～10min.
Described composite sphere is made up of ball core and shell, and the ball core of described composite sphere comprises trace element and swelling agent, and shell mainly is made of calcium oxide, magnesium oxide or calcium oxide and magnesian mixture.
The ball core of described composite sphere is prepared from by following raw materials by weight: trace element 0.1～99%; Swelling agent 1～70%; Binding agent 0～30%.
The ball core of described composite sphere is prepared from by following raw materials by weight: trace element 30～80%; Swelling agent 8～55%; Binding agent 5～15%.
The shell of described composite sphere also comprises 0～20% binding agent.
Described trace element is any one in Fe-18%B master alloy, the Fe-30%RE master alloy.
RE is any one among the mishmetal of mishmetal, rich Ce, Nd of rich Ce, La or pure rare earth Ce, Nd, La, Gd, the Sm in the described Fe-30%RE master alloy.
Described swelling agent is made of the mixture of lime carbonate, magnesiumcarbonate or lime carbonate and magnesiumcarbonate.
Described binding agent be in clay, Portland cement, wilkinite, the water glass any one or two or more.
Advantage of the present invention and beneficial effect are as follows:
(1), processing method of the present invention is owing to adopt composite sphere to join in the molten steel, it can fully invade molten steel inside, 1600 ℃ of time-delay explosions, the reaction times is at 5～35s, compactness, thermostability are higher.Therefore can significantly improve trace element stable and effective recovery in steel, recovery rate can reach 70～90%, thereby effectively raises steel performance.
(2), because the present invention to the raising of the effective recovery rate of trace element, can reduce the consumption of the trace element of ton steel, save cost.
(3), technology of the present invention simple, flexibly, make things convenient for easy handling.
Embodiment
Below in conjunction with specific embodiment the present invention is further elaborated, but protection scope of the present invention is not limited by specific embodiment, is as the criterion with claims.In addition, with under the prerequisite of technical solution of the present invention, any change or change that those of ordinary skills that the present invention did are realized easily all will fall within the claim scope of the present invention.
Embodiment 1
First steel-making water in converter, in tapping process, in ladle, add the reductor that 1.5～3.5kg/t purchases in advance and carry out deoxidation just, deoxidation just finishes the back and feeds aluminum steel with feeding wire machine, molten steel is carried out deep deoxidation, the add-on of aluminium is 0.10～0.40kg/t, and sour molten aluminium in the molten steel is controlled at 0.02～0.04%; Ladle is transported to the LF station carries out refining, in the refining slag total amount of FeO and MnO less than 10%, α in the molten steel
[O]Less than 5 * 10
-5Refining is transported to the RH station with ladle after finishing, and vacuumizes, circulates only, adds composite sphere from the tremie pipe of RH downtake heteropleural; Spheroid adds fashionable RH stove vacuum degree control below 500pa, carries out circular treatment, and cycling time is at 0.1～10min; The machine cast is taken out of, gone up to vacuum breaker, and continuous casting adopts whole process protection.
The preparation of described composite sphere, its shell is mixed with by the Portland cement and the calcium oxide that contain 1%.Get the Fe-18%B master alloy 0.1kg that its particle diameter is 1nm～3.5mm by formulation ratio ball core, lime carbonate 70kg, clay 29.9kg, above-mentioned powder is put into blender fully to mix, mixing time is 1h～3h, above-mentioned mixed raw material is dried processing in drying plant, bake out temperature is 80～110 ℃, and the time is 2～6h.Raw material after above-mentioned oven dry is handled adopts scrolling method to make the ball core on balling disc, and the rotating speed of balling disc is 400～1600r/min, and the control of ball core size determines that by screening obtaining its diameter is 1～20mm; Get the required powder of shell by said ratio and carry out thorough mixing in blender, the activity 〉=200ml of calcium oxide, mixing time are 1～3h; The ball core and the shell material that have made are carried out compound system ball by scrolling method on granulating disc; control definite by screening to the spheroid size; the composite sphere that makes is of a size of 5～60mm; at last with it 60～120 ℃ of oven dry; drying time 10～24h; be cooled to room temperature with its packing 10～30kg/ bag, and in 20 days, use.
Embodiment 2
First steel-making water in converter, in tapping process, in ladle, add the reductor that 1.5～2.5kg/t purchases in advance and carry out deoxidation just, deoxidation just finishes the back and feeds aluminum steel with feeding wire machine, molten steel is carried out deep deoxidation, the add-on of aluminium is 0.10～0.30kg/t, and sour molten aluminium in the molten steel is controlled at 0.02～0.04%; Ladle is transported to the RH station carries out refining, vacuumize, only the circulation, in the refining slag total amount of FeO and MnO less than 10%, α in the molten steel
[O]Less than 5 * 10
-5Refining finishes the back and add composite sphere from the tremie pipe of RH downtake heteropleural; RH stove vacuum tightness is carried out circular treatment below 500pa, cycling time is at 5min; The machine cast is taken out of, gone up to vacuum breaker, and continuous casting adopts whole process protection.
The preparation of described composite sphere, its shell is mixed with by containing 10% clay and calcium oxide and magnesian mixture (both proportionings do not have strict requirement).Get the Fe-18%B master alloy 55kg that its particle diameter is 1nm～3.5mm, lime carbonate 44kg, wilkinite 1kg by formulation ratio ball core; Above-mentioned raw materials is put into blender fully mix, mixing time is 1h～3h, and above-mentioned mixed raw material is dried processing again in drying plant, and bake out temperature is 90～120 ℃, and the time is 2～5h; Raw material after above-mentioned oven dry is handled adopts scrolling method to make the ball core on balling disc, and the rotating speed of balling disc is 400～1600r/min, and the control of ball core size determines that by screening obtaining its diameter is 1～20mm.Get the required powder of shell by said ratio and carry out thorough mixing in blender, calcium oxide, magnesian activity 〉=200ml, mixing time are 1～3h.The ball core and the shell material that have made are carried out compound system ball by scrolling method on granulating disc; control definite by screening to the spheroid size; the composite sphere that makes is of a size of 5～60mm; at last with it 80～200 ℃ of oven dry; drying time 10～12h; be cooled to room temperature with its packing 10～30kg/ bag, and in 20 days, use.
Embodiment 3
First steel-making water in converter, in tapping process, in ladle, add the reductor that 1.5～2kg/t purchases in advance and carry out deoxidation just, deoxidation just finishes the back and adds aluminum shot, molten steel is carried out deep deoxidation, the add-on of aluminium is 0.10～0.25kg/t, and sour molten aluminium in the molten steel is controlled at 0.02～0.04%; Ladle is transported to the CAS-OB station carries out refining, in the refining slag total amount of FeO and MnO less than 10%, α in the molten steel
[O]Less than 5 * 10
-5After refining finishes ladle is transported to the RH station, vacuumizes, circulation only, when vacuum tightness when 500pa is following, from the tremie pipe of RH downtake heteropleural, add composite sphere, composite sphere carries out circular treatment after adding, cycling time is at 3min; Vacuum breaker is taken out of, last machine casting, and continuous casting adopts whole process protection.
The preparation of described composite sphere, its shell is mixed with by the water glass and the calcium oxide that contain 15%.Get the Fe-30%RE master alloy 99kg that its particle diameter is 1nm～3.5mm by formulation ratio ball core, RE is that rare earth cerium lanthanum is main mishmetal, magnesiumcarbonate 1kg; Above-mentioned raw materials is put into blender fully mix, mixing time is 1h～3h, and above-mentioned mixed raw material is dried processing again in drying plant, and bake out temperature is 100～150 ℃, and the time is 2～5h.Raw material after above-mentioned oven dry is handled adopts scrolling method to make the ball core on balling disc, and the rotating speed of balling disc is 400～1600r/min, and the control of ball core size determines that by screening obtaining its diameter is 1～20mm; Get the required powder of shell by said ratio and carry out thorough mixing in blender, the activity 〉=200ml of calcium oxide, mixing time are 1～3h; The ball core and the shell material that have made are carried out compound system ball by scrolling method on granulating disc; control definite by screening to the spheroid size; the composite sphere that makes is of a size of 5～60mm; at last with it 90～150 ℃ of oven dry; drying time 10～18h; be cooled to room temperature with its packing 10～30kg/ bag, and in 20 days, use.
Embodiment 4
First steel-making water in converter, in tapping process, in ladle, add the reductor that 1.5～2.5kg/t purchases in advance and carry out deoxidation just, deoxidation just finishes the back and feeds aluminum steel with feeding wire machine, molten steel is carried out deep deoxidation, the add-on of aluminium is 0.10～0.30kg/t, and sour molten aluminium in the molten steel is controlled at 0.02～0.04%; Ladle is transported to the RH station carries out refining, vacuumize, only the circulation, in the refining slag total amount of FeO and MnO less than 10%, α in the molten steel
[O]Less than 5 * 10
-5When vacuum tightness when 500pa is following, from the tremie pipe of RH downtake heteropleural, add composite sphere, 8min only circulates; Vacuum breaker is taken out of, last machine cast, and continuous casting adopts whole process protection.
The preparation of described composite sphere, its shell are that (both do not have strict requirement for calcium oxide and magnesian mixture; Binding agent is zero) preparation.Get the Fe-30%RE master alloy 80kg that its particle diameter is 1nm～3.5mm by formulation ratio ball core, RE is that rare earth cerium neodymium is main mishmetal, magnesiumcarbonate 15kg, wilkinite 5kg; Above-mentioned raw materials is put into blender fully mix, mixing time is 1h～3h, and above-mentioned mixed raw material is dried processing again in drying plant, and bake out temperature is 80～140 ℃, and the time is 2～7h.Raw material after above-mentioned oven dry is handled adopts scrolling method to make the ball core on balling disc, and the rotating speed of balling disc is 400～1600r/min, and the control of ball core size determines that by screening obtaining its diameter is 1～20mm.Get the required powder of shell by said ratio and carry out thorough mixing in blender, calcium oxide, magnesian activity 〉=200ml, mixing time are 1～3h.The ball core and the shell material that have made are carried out compound system ball by scrolling method on granulating disc; control definite by screening to the spheroid size; the composite sphere that makes is of a size of 5～60mm; at last with it 70～180 ℃ of oven dry; drying time 10～15h; be cooled to room temperature with its packing 10～30kg/ bag, and in 20 days, use.
Embodiment 5
First steel-making water in converter, in tapping process, in ladle, add the reductor that 1.5～3.5kg/t purchases in advance and carry out deoxidation just, deoxidation just finishes the back and adds aluminum shot, molten steel is carried out deep deoxidation, the add-on of aluminium is 0.10～0.10kg/t, and sour molten aluminium in the molten steel is controlled at 0.02～0.04%; Ladle is transported to the VD station carries out refining, in the refining slag total amount of FeO and MnO less than 10%, α in the molten steel
[O]Less than 5 * 10
-5After refining finishes ladle is transported to the RH station, vacuumizes, circulation only, when vacuum tightness when 500pa is following, from the tremie pipe of RH downtake heteropleural, add composite sphere; RH stove vacuum tightness is below 500pa, and 5min only circulates; Vacuum breaker is taken out of, last machine cast, and continuous casting adopts whole process protection.
The preparation of described composite sphere, its shell is mixed with by containing 20% clay and calcium oxide and magnesia mixture.Get the Fe-30%Ce master alloy 45kg that its particle diameter is 1nm～3.5mm by formulation ratio ball core, by the mixture 35kg that gets lime carbonate and magnesiumcarbonate at 2: 1, clay 15kg, water glass 5kg; Above-mentioned raw materials is put into blender fully mix, mixing time is 1h～3h, and above-mentioned mixed raw material is dried processing again in drying plant, and bake out temperature is 90～130 ℃, and the time is 2～8h; Raw material after above-mentioned oven dry is handled adopts scrolling method to make the ball core on balling disc, and the rotating speed of balling disc is 400～1600r/min, and the control of ball core size determines that by screening obtaining its diameter is 1～20mm; Get the required powder of shell by said ratio and carry out thorough mixing in blender, calcium oxide, magnesian activity 〉=200ml, mixing time are 1～3h.The ball core and the shell material that have made are carried out compound system ball by scrolling method on granulating disc; control definite by screening to the spheroid size; the composite sphere that makes is of a size of 5～60mm; at last with it 100～200 ℃ of oven dry; drying time 10～15h; be cooled to room temperature with its packing 10～30kg/ bag, and in 20 days, use.
Followingly just adopt processing method of the present invention that the recovery rate of trace element in the steel is compared:
Hot metal charging 115t in the top and bottom combined blown converter, just be smelt molten steel, add reductor 300kg in the converter tapping process and carry out deoxidation just, tapping process adds refining slag 1000kg simultaneously, and then to feed aluminum steel 260m add-on with feeding wire machine be that 0.10～0.40kg/t (meter 40kg) carries out deep deoxidation, and sour molten aluminium in the molten steel is controlled at 0.035%.After having fed aluminum steel, ladle is transported to LF and is carried out refining, and the total amount of analyzing FeO and MnO in the slag specimen is less than 5.0%, α in the on-line determination molten steel
[O]Be 20 * 10
-6Take out of, ladle is transported to the refining of RH Seiko position, vacuumize, circulate only, when vacuum tightness is lower than 80Pa, from the feed opening of RH downtake heteropleural, add the composite sphere 50kg of boracic; Spheroid adds back circulation 1min, and vacuum breaker is taken out of, last machine cast, and continuous casting adopts whole process protection, promptly.Comparing result sees the following form.
Ginseng sees the above table, and before adding composite sphere of the present invention, micronutrient levels is 0.0001%～0.0003% in the sampling analysis steel, and the recovery rate that adds micronutrient levels in the composite sphere post analysis Finished Steel of the present invention is 70%～90%.
Claims (8)
1, a kind of being used for controlled the processing method that the steel trace element accurately adds: it is characterized in that may further comprise the steps:
A, first deoxidation: first steel-making water in the converter, in tapping process, in ladle, add reductor and carry out deoxidation just, the add-on of reductor is 1.5～3.5kg/t;
B, deep deoxidation: add aluminium after first deoxidation finishes molten steel is carried out deep deoxidation, and sour molten aluminium in the molten steel is controlled at 0.02～0.04%;
C, refining: ladle is transported to LF, RH, CAS-OB or VD station carries out refining, in the refining slag total amount of FeO and MnO less than 10%, α in the molten steel
[O]Less than 5 * 10
-5
The adding of d, composite sphere: ladle is transported to the RH station, adds composite sphere from the tremie pipe of RH downtake heteropleural;
E, continuous casting: continuous casting adopts whole process protection;
Described composite sphere is made up of ball core and shell, and described shell mainly is made of calcium oxide, magnesium oxide or calcium oxide and magnesian mixture; The ball core of described composite sphere is prepared from by following raw materials by weight: trace element 30～80%, swelling agent 8～55%, binding agent 5～15%;
Described ball core diameter is 1～20mm; The composite sphere diameter is 5～60mm; Ball core raw material particle diameter is 1nm～3.5mm.
Described trace element is any one in Fe-18%B master alloy, the Fe-30%RE master alloy.
2, processing method according to claim 1 is characterized in that the described aluminium that adds of step b, and its adding mode is for feeding aluminum steel or adding in the aluminum shot any one, and the add-on of aluminium is 0.10～0.40kg/t.
3, processing method according to claim 1 is characterized in that the adding of the described composite sphere of steps d, and RH stove vacuum tightness should remain on below the 500pa.
4, processing method according to claim 1 is characterized in that the adding of the described composite sphere of steps d, and it need carry out circular treatment after adding, and cycling time is at 0.1～10min.
5, processing method according to claim 1 is characterized in that the shell of described composite sphere also comprises 0～20% binding agent.
6, processing method according to claim 1, the RE that it is characterized in that described Fe-30%RE master alloy is any one among the mishmetal of mishmetal, rich Ce, Nd of rich Ce, La or pure rare earth Ce, Nd, La, Gd, the Sm.
7, processing method according to claim 1 is characterized in that described swelling agent is made of the mixture of lime carbonate, magnesiumcarbonate or lime carbonate and magnesiumcarbonate.
8, processing method according to claim 1 or 5, it is characterized in that described binding agent be in clay, Portland cement, wilkinite, the water glass any one or two or more.
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102146494A (en) * | 2010-02-05 | 2011-08-10 | 鞍钢股份有限公司 | Production method of fine oxide dispersed steel |
| CN102373360A (en) * | 2011-11-03 | 2012-03-14 | 内蒙古包钢钢联股份有限公司 | Fe-La intermediate alloy for rare earth addition into steel and manufacture method thereof |
| CN102383028A (en) * | 2011-11-03 | 2012-03-21 | 内蒙古包钢钢联股份有限公司 | Fe and mixed rare earth intermediate alloy for adding rare earth into steel and preparation method for Fe and mixed rare earth intermediate alloy |
| CN102732685A (en) * | 2012-06-20 | 2012-10-17 | 内蒙古包钢钢联股份有限公司 | Method for adding rare earth into RH refining furnace |
| CN102766731A (en) * | 2012-07-03 | 2012-11-07 | 南京钢铁股份有限公司 | Vacuum refining process |
| CN103103434A (en) * | 2013-02-26 | 2013-05-15 | 内蒙古包钢钢联股份有限公司 | LaFeSiCa alloy for steel and manufacturing method thereof |
| CN103805836A (en) * | 2013-11-25 | 2014-05-21 | 内蒙古包钢钢联股份有限公司 | Cerium-ferrum alloy for producing rare earth steel |
| CN105274281A (en) * | 2014-06-23 | 2016-01-27 | 鞍钢股份有限公司 | Method used for controlling boron content in steel accurately |
| CN105219920A (en) * | 2014-06-23 | 2016-01-06 | 鞍钢股份有限公司 | A kind of boracic spheroid additive and preparation method thereof |
| CN105385811A (en) * | 2015-11-27 | 2016-03-09 | 山东钢铁股份有限公司 | Production method for steel containing aluminum |
| CN106893799B (en) * | 2015-12-18 | 2019-02-19 | 中国科学院金属研究所 | High-purity H13 hot die steel method is prepared using aluminium rare earth composite deoxidation |
| CN107179703B (en) * | 2016-03-09 | 2020-06-23 | 宝山钢铁股份有限公司 | Steelmaking alloy input control method |
| CN113416813B (en) * | 2021-05-14 | 2022-09-13 | 包头钢铁（集团）有限责任公司 | Method for controlling addition of rare earth alloy of rare earth structural steel |
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