CN106967863A - Alundum (Al2O3) inclusion method in one kind reduction semi-steel making steel billet - Google Patents

Alundum (Al2O3) inclusion method in one kind reduction semi-steel making steel billet Download PDF

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Publication number
CN106967863A
CN106967863A CN201710386168.4A CN201710386168A CN106967863A CN 106967863 A CN106967863 A CN 106967863A CN 201710386168 A CN201710386168 A CN 201710386168A CN 106967863 A CN106967863 A CN 106967863A
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China
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steel
deoxidation
molten steel
molten
content
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CN201710386168.4A
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Inventor
陈路
曾建华
陈均
梁新腾
张彦恒
黄德胜
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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Priority to CN201710386168.4A priority Critical patent/CN106967863A/en
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006Adding metallic additives
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0025Adding carbon material
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/06Deoxidising, e.g. killing
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C37/00Cast-iron alloys

Abstract

The invention provides Al in one kind reduction semi-steel making steel billet2O3The method being mingled with, including:Anthracite carburant is first added in molten steel and carries out deoxidation;Then aluminum steel is added into the material after deoxidation and continues deoxidation, obtain the molten steel after deoxidation;Molten steel after deoxidation is cast, steel billet is obtained.Compared with prior art, Al in semi-steel making steel billet can be reduced the invention provides one kind2O3The method being mingled with, preliminary deoxidation is first carried out to molten steel using anthracite carburant, further deoxidation is carried out to molten steel using aluminum steel again, the present invention need not carry out deoxidation using alfer to molten steel, pass through using cooperatively for anthracite carburant and aluminum steel, in the case where ensureing that deoxidation effect is good, Al in molten steel is reduced after deoxidation2O3Be mingled with, using this low Al2O3The steel billet for preparing of the molten steel being mingled with Al2O3It is mingled with relatively low.

Description

Alundum (Al2O3) inclusion method in one kind reduction semi-steel making steel billet
Technical field
The present invention relates to Al in technical field of smelting, more particularly to a kind of reduction semi-steel making steel billet2O3The method being mingled with.
Background technology
Climb steel vanadium converter and use semi-steel making, due to the Si contents in half steel are relatively low, C content is low compared with molten iron and thermal source not Foot, so compared with molten iron-steelmaking, semi-steel making needs addition to contain SiO2, FeO and Fe2O3Composite slag, smelt the later stage control Need to re-blow more oxygen to meet outlet temperature control requirement, cause that semi-steel making endpoint molten steel C content is relatively low, oxygen activity compared with Height, terminal oxygen content is higher.
Prior art typically carries out deoxidation using alfer to molten steel, and alfer consumption is larger, adds production Cost, and Al in molten steel is also created using alfer progress deoxidation2O3Be mingled with and increase, casting and steel to molten steel End properties have adverse effect on.Al in molten steel is reduced in order to improve steel quality2O3It is mingled with, so as to obtain Al2O3It is mingled with Relatively low steel billet, develops efficient, high-quality deoxidization technique necessary.
The content of the invention
In view of this, the invention provides Al in one kind reduction semi-steel making steel billet2O3The method being mingled with, the present invention is provided The obtained steel billet of method in Al2O3It is mingled with relatively low.
The invention provides Al in one kind reduction semi-steel making steel billet2O3The method being mingled with, including:
Anthracite carburant is first added into molten steel and carries out deoxidation;
Then aluminum steel is added into the material obtained after deoxidation and continues deoxidation, obtain the molten steel after deoxidation;
Molten steel after deoxidation is cast, steel billet is obtained.
It is preferred that, mass content >=90% of fixed carbon in the anthracite carburant.
It is preferred that, the granularity of the anthracite carburant is 3~15mm.
It is preferred that, the consumption of the anthracite carburant is 0.3~the 0.7 ‰ of steel quality.
It is preferred that, mass content >=99.5% of aluminium in the aluminum steel.
It is preferred that, a diameter of 5~15mm of the aluminum steel.
It is preferred that, in the molten steel:
C mass content is 3.2~4.1%;
Si mass content is 0.015~0.030%;
Mn mass content is 0.02~0.04%;
P mass content is 0.06~0.08%;
S mass content≤0.015%.
It is preferred that, the oxygen content in the molten steel is 600~700ppm.
It is preferred that, the method that anthracite carburant carries out deoxidation is specially:
Anthracite carburant is added in molten steel tapping 1/3, makes the oxygen content in water of the steel after deoxidation≤150ppm.
It is preferred that, the method for aluminum steel deoxidation is specially:
Molten steel tapping carries out feeding aluminum steel deoxidation after finishing, and makes the oxygen content in water of the steel after deoxidation≤10ppm.
Compared with prior art, the invention provides Al in one kind reduction semi-steel making steel billet2O3The method being mingled with, is first adopted Preliminary deoxidation is carried out to molten steel with anthracite carburant, then further deoxidation is carried out to molten steel using aluminum steel, the present invention is used Anthracite carburant carries out deoxidation, without using substantial amounts of alfer in deoxidation process, in anthracite carburant and aluminum steel Mating reaction under, it is ensured that in the case that deoxidation effect is good, reduce Al in molten steel2O3It is mingled with, so that after this deoxidation Al in the steel billet that molten steel is prepared2O3It is mingled with relatively low.In addition, the present invention is used cooperatively by carburant and aluminum steel carries out deoxidation, Avoid using alfer deoxidation, in the case where deoxidation effect is good, reduce deoxidation cost.
Embodiment
The technical scheme in the embodiment of the present invention will be clearly and completely described below, it is clear that described implementation Example only a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, this area is common Technical staff it is improved or retouching all other example, belong to the scope of protection of the invention.
The invention provides Al in one kind reduction semi-steel making steel billet2O3The method being mingled with, comprises the following steps:
(1) anthracite carburant is first added into molten steel and carries out deoxidation;
(2) and then into the material obtained after deoxidation add aluminum steel and continue deoxidation, obtain the molten steel after deoxidation;
(3) molten steel after deoxidation is cast, obtains steel billet.
The present invention does not have special limitation to the composition of molten steel and source, it is preferred to use the molten steel that semi-steel making is obtained, such as The molten steel obtained after converter semisteel smelting.In the present invention, in the molten steel:C mass content is preferably 3.2~4.1%, more Preferably 3.5~3.7%;Si mass content is preferably 0.015~0.030%, and more preferably 0.020~0.025%;Mn's Mass content is preferably 0.02~0.04%, and more preferably 0.03%;P mass content is preferably 0.06~0.08%, more excellent Elect 0.07% as;S mass content is preferably≤0.015%.
Molten steel in the present invention is preferably the molten steel obtained after converter semisteel smelting, such as semisteel smelting DTLA steel grades, specifically Method is:
The molten steel of mentioned component is entered into stove and carries out oxygen furnace steel.
In the present invention, the temperature that the molten steel enters stove is preferably 1300~1360 DEG C, more preferably 1320~1340 DEG C. In the present invention, the amount that the molten steel loads converter is preferably 125~145 tons, more preferably 130~140 tons.
In the present invention, oxygen flow is preferably 28000~32000Nm during the oxygen furnace steel3/ h, more preferably 30000Nm3/h。
The present invention preferably adds auxiliary material after 2~4min of oxygen blast.
In the present invention, during the oxygen blast basic rifle position of the oxygen gun sprayer away from molten pool metal liquid level be preferably 1.4~ 2m, more preferably 1.6~1.8m;The rifle position that blows is preferably 1.4~1.8m, more preferably 1.6m;Open blow rifle position be preferably 1.8~ 2.2m, more preferably 2m;To prevent from burning rifle.
In the present invention, catch carbon rifle position is preferably 1.2~1.6m during the oxygen blast, more preferably 1.4m, to ensure Slag has good mobility, and early slugging, many dephosphorizations simultaneously protect furnace lining.
In the present invention, rifle position refers to the end of oxygen gun sprayer to the distance of bath surface.
In the present invention, the bottom blown gas of the early stage (molten steel starts tapping to tapping to 1/2 stage) of oxygen furnace steel is preferred For N2, N2Flow be preferably 40~60m3/ h, more preferably 45~55m3/ h, most preferably 50m3/h。
In the present invention, the bottom blown gas of the oxygen furnace steel mid-term (molten steel tapping 1/2 to 2/3 stage of tapping) is preferably Ar, Ar flow are preferably 40~60m3/ h, more preferably 45~55m3/ h, most preferably 50m3/h。
In the present invention, the bottom blown gas of the oxygen furnace steel later stage (molten steel tapping 2/3 finishes the stage to tapping) is preferred For Ar, Ar flow is preferably 70~90m3/ h, more preferably 75~85m3/ h, most preferably 80m3/h。
In the present invention, tapping process preferably blows Ar after the completion of the oxygen furnace steel, and Ar flow is preferably 40~60m3/ H, more preferably 45~55m3/ h, most preferably 50m3/h。
In the present invention, the Controlling principle of the oxygen furnace steel is preferably that Fast Slag Melting, early slugging, clinker are active, process Do not return dry, not splash.
In the present invention, the oxygen content in the molten steel is preferably 600~700ppm, more preferably 620~680ppm, most Preferably 640~660ppm.
The present invention first carries out deoxidation treatment using anthracite carburant to molten steel, it is to avoid taken off using alfer Oxygen.The present invention carries out deoxidation using anthracite carburant to molten steel, and deoxidation effect is good, oxygen content after deoxidation in molten steel and Al2O3Be mingled with relatively low, and consumption is few, and cost is low.In the present invention, in the anthracite carburant fixed carbon quality Content is preferably >=90%;The mass content of ash content is preferably≤6%;The mass content of volatile matter is preferably≤2%;The quality of full sulfur content Content is preferably≤0.3%;The mass content of moisture is preferably≤1%.In the present invention, the granularity of the anthracite carburant is preferred For 3~15mm, more preferably 5~10mm.In the present invention, in the anthracite carburant preferably without being mixed into foreing impuritys Thing.The present invention, without special limitation, can be bought by market and be obtained to the source of the anthracite carburant.
In the present invention, the consumption of the anthracite carburant is preferably 0.3~the 0.7 ‰ of quality of molten steel, more preferably 0.4~0.6 ‰, most preferably 0.5 ‰.
The present invention does not have special limitation to the method for the anthracite carburant deoxidation, ripe using those skilled in the art The technical scheme for the deoxidation of molten steel known.In the present invention, the method for the anthracite carburant deoxidation is preferably:
Anthracite carburant is added in molten steel tapping 1/3, makes the oxygen content in water of the steel after deoxidation≤150ppm.
After anthracite carburant deoxidation, to deoxidation after add aluminum steel in obtained material and continue deoxidation.In the present invention In, in the aluminum steel Al mass content preferably >=99.5%;Si mass content is preferably≤0.15%;Fe mass content is excellent Choosing≤0.2%;Cu mass content is preferably≤0.02%.In the present invention, the surface preferred smooth of the aluminum steel, without wrinkle Crackle, bubble, overlap, burr;Aluminum coil around it is neat, without intersection.In the present invention, the diameter of the aluminum steel be preferably 5~ 15mm, more preferably 8~12mm, most preferably 10mm.The present invention originates without special limitation to the aluminum steel, can be by city Field purchase is obtained.
The present invention does not have special limitation to the method for aluminum steel deoxidation, using hello aluminum steel well known to those skilled in the art Technical scheme carries out deoxidation.In the present invention, the method for the aluminum steel deoxidation is preferably:
Molten steel tapping carries out feeding aluminum steel deoxidation after finishing, and makes the oxygen content in water of the steel after deoxidation≤10ppm.
In the present invention, Al in reduction semi-steel making steel billet2O3The method being mingled with is preferably:
Molten steel is subjected to oxygen furnace steel, adding anthracite carburant in tapping 1/3 carries out deoxidation, makes the molten steel after deoxidation In oxygen content≤150ppm;The composition of molten steel is:3.2~4.1wt% of C;Si0.015~0.030wt%;Mn 0.02~ 0.04wt%;P 0.06~0.08wt%, S≤0.015wt%;Oxygen content in molten steel is 600~700ppm;
Carry out feeding aluminum steel deoxidation after tapping is finished, make the oxygen content in water of the steel after deoxidation≤10ppm.
Molten steel after deoxidation is cast, steel billet is obtained.
The present invention does not have special limitation to the method that the molten steel after the deoxidation is cast, using people in the art The technical scheme of molten steel casting known to member, those skilled in the art can select suitable casting process according to actual conditions, pour Casting obtains steel billet.
Raw materials used following examples of the present invention are commercial goods, anthracite carburant used, and composition is:Fixed carbon contains Amount >=90wt%;Ash content≤6wt%;Volatile matter≤2wt%;Full sulfur content≤0.3wt%;Moisture≤1.0wt%;Granularity be 3~ 15mm.The composition of aluminum steel used is:Al >=99.5wt%, Si≤0.15wt%, Fe≤0.20wt%, Cu≤0.02wt%;Aluminium A diameter of 10mm of line.
The method for making steel of molten steel is:
After converter has gone out steel and carries out slag splashing, 1300~1360 DEG C load half steel molten steel and start oxygen furnace steel, oxygen Throughput is 30000Nm3/h。
Open to blow and auxiliary material is initially added into after 3min.
Oxygen gun sprayer is opened away from the basic 1.4~2m of rifle position of molten pool metal liquid level, blowing rifle position 1.4m~1.8m and blows rifle position 2m, Catch carbon rifle position 1.4m.The rifle position of oxygen rifle refers to the end of oxygen gun sprayer to the distance of bath surface.
Bottom blown gas early stage (starting the stage of tapping to tapping 1/2) blows N2, flow is 50m3/h;The mid-term that blows (tapping 1/2 To 2/3 stage of tapping) it is Ar, flow is 50m3/h;(tapping 2/3 to complete tapping) is blown the later stage for Ar, flow is 80m3/h; Tapping completes after-blow Ar, and flow is 50m3/ h, obtains molten steel.
The composition of molten steel is:C 3.2~4.1wt%, Si 0.02~0.04wt% of 0.015~0.030wt%, Mn, P0.06~0.08wt%, S≤0.015wt%;Oxygen content is 600~700ppm.
Embodiment 1
According to the method steel-making described in above-mentioned technical proposal, deoxidation is not carried out, obtained molten steel composition is:C3.2wt%, Si 0.015wt%, Mn 0.02wt%, P 0.06wt%, S≤0.015wt%;Oxygen content is 650ppm.
Deoxidation is carried out in the steelmaking process described in above-mentioned technical proposal, specific method is:
125 tons of molten steel steel-making, anthracite carburant 70Kg progress deoxidations, steel water oxygen after deoxidation are added in tapping 1/3 Content is 120ppm;200m is fed in tapping aluminum steel after finishing carries out deoxidation, and it is 6ppm to obtain the oxygen content in molten steel.(use and turn Constant temperature oxygen measuring probe is carried in oxygen content in stove sublance test molten steel, revolving furnace sublance)
The molten steel obtained after aluminum steel deoxidation is cast, steel billet is obtained.
Embodiment 2
According to the method steel-making described in above-mentioned technical proposal, deoxidation is not carried out, obtained molten steel composition is:C3.6wt%, Si 0.022wt%, Mn 0.03wt%, P 0.07wt%, S≤0.015wt%;Oxygen content is 660ppm.
Deoxidation is carried out in the steelmaking process described in above-mentioned technical proposal, specific method is:
135 tons of molten steel steel-making, anthracite carburant 72Kg progress deoxidations, steel water oxygen after deoxidation are added in tapping 1/3 Content is 150ppm;195m is fed in tapping aluminum steel after finishing carries out deoxidation, and it is 4ppm to obtain the oxygen content in molten steel.(use and turn Constant temperature oxygen measuring probe is carried in oxygen content in stove sublance test molten steel, revolving furnace sublance)
The molten steel obtained after aluminum steel deoxidation is cast, steel billet is obtained.
Embodiment 3
According to the method steel-making described in above-mentioned technical proposal, deoxidation is not carried out, obtained molten steel composition is:C4.1wt%, Si0.03wt%, Mn 0.04wt%, P 0.08wt%, S≤0.015wt%;Oxygen content is 680ppm.
Deoxidation is carried out in the steelmaking process described in above-mentioned technical proposal, specific method is:
145 tons of molten steel steel-making, anthracite carburant 73Kg progress deoxidations, steel water oxygen after deoxidation are added in tapping 1/3 Content is 110ppm;204m is fed in tapping aluminum steel after finishing carries out deoxidation, and it is 7ppm to obtain the oxygen content in molten steel.(use and turn Constant temperature oxygen measuring probe is carried in oxygen content in stove sublance test molten steel, revolving furnace sublance)
The molten steel obtained after aluminum steel deoxidation is cast, steel billet is obtained.
Comparative example 1
According to the method steel-making described in above-mentioned technical proposal, deoxidation is not carried out, obtained molten steel composition is:C3.6wt%, Si0.022wt%, Mn 0.03wt%, P 0.07wt%, S≤0.015wt%;Oxygen content is 660ppm.
Deoxidation is carried out in the steelmaking process described in above-mentioned technical proposal, specific method is:
135 tons of molten steel steel-making, the disposable deoxidation of alfer 550Kg progress, steel of being tapped after deoxidation are added in tapping 1/3 Oxygen content in water is 20ppm.(constant temperature oxygen measuring probe is carried in the oxygen content tested using revolving furnace sublance in molten steel, revolving furnace sublance)
Obtained molten steel is cast, steel billet is obtained.
Comparative example 2
Deoxidation is carried out according to the method described in embodiment 2, as different from Example 2, nothing is replaced using graphite carburant Bituminous coal carburant, it is 15ppm to obtain the oxygen content in molten steel.(oxygen content tested using revolving furnace sublance in molten steel, revolving furnace sublance In carry constant temperature oxygen measuring probe)
Molten steel after deoxidation is cast, steel billet is obtained.
Comparative example 3
Deoxidation is carried out according to the method described in embodiment 2, as different from Example 2, is replaced using petroleum coke carburant Anthracite carburant, it is 18ppm to obtain the oxygen content in molten steel.(oxygen content tested using revolving furnace sublance in molten steel, converter pair Constant temperature oxygen measuring probe is carried in rifle)
Molten steel after deoxidation is cast, steel billet is obtained.
Ferro-aluminum price is 8000 yuan/ton;Aluminum steel price is 12800 yuan/ton;The price of anthracite carburant be 1800 yuan/ Ton.
Embodiment 2 is compared with comparative example 1, and embodiment 2 does not carry out deoxidation, steel-making cost reduction by 7.9 using alfer Yuan/ton, and deoxidation effect is better than comparative example 1.The deoxidation effect of comparative example 2 is worse than embodiment 2;The deoxidation effect of comparative example 3 is poor In embodiment 2.
According to GB/T 10561-2005《The bioassay standard judge picture microscopy of nonmetallic inclusionsin steel content》It is right Alumina inclusion is detected in the steel billet that the embodiment of the present invention 1~3 and comparative example 1~3 are obtained, and testing result is respectively 6 Individual/mm2, 5/mm2, 6/mm2, 10/mm2, 8/mm2, 9/mm2.Alumina inclusion is equal in the molten steel that embodiment is obtained Less than comparative example, embodiment 2 is compared with comparative example 1, Al2O3Inclusion content reduces Al in 50%, and embodiment 22O3Inclusion content is low In comparative example 2 and comparative example 3.
Al in the reduction semi-steel making steel billet provided from above example and comparative example, the present invention2O3The method being mingled with Deoxidation is carried out by using two-step method, deoxidation is first carried out using anthracite carburant and then Al line deoxidation is used, increased in anthracite Under carbon agent and the mating reaction of Al lines, make that the steel oxygen content in water after deoxidation is low, Al2O3Inclusion content is few, and cost is relatively low, system Al in standby obtained steel billet2O3Inclusion content is also less.
As seen from the above embodiment, the invention provides Al in one kind reduction semi-steel making steel billet2O3The method being mingled with, bag Include:Anthracite carburant is first added in molten steel and carries out deoxidation, aluminum steel is then added into the material after deoxidation continues deoxidation.With Prior art is compared, the invention provides a kind of method of deoxidation for semi-steel making molten steel, first using anthracite carburant pair Molten steel carries out preliminary deoxidation, then carries out further deoxidation to molten steel using aluminum steel, in the cooperation of anthracite carburant and aluminum steel Under effect, in the case where ensureing that deoxidation effect is good, reduce and reduce Al after deoxidation in molten steel2O3Inclusion content, and deoxidation Cost is low, makes Al in the steel billet for preparing2O3Inclusion content is relatively low.
Above-described is only the preferred embodiment of the present invention, it is noted that for the ordinary skill of the art For personnel, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications It should be regarded as protection scope of the present invention.

Claims (10)

1. Al in one kind reduction semi-steel making steel billet2O3The method being mingled with, comprises the following steps:
(1) anthracite carburant is first added into molten steel and carries out deoxidation;
(2) and then into the material obtained after deoxidation add aluminum steel and continue deoxidation, obtain the molten steel after deoxidation;
(3) molten steel after deoxidation is cast, obtains steel billet.
2. according to the method described in claim 1, it is characterised in that the mass content of fixed carbon in the anthracite carburant >= 90%.
3. according to the method described in claim 1, it is characterised in that the granularity of the anthracite carburant is 3~15mm.
4. according to the method described in claim 1, it is characterised in that the consumption of the anthracite carburant is steel quality 0.3 ‰~0.7 ‰.
5. according to the method described in claim 1, it is characterised in that mass content >=99.5% of aluminium in the aluminum steel.
6. according to the method described in claim 1, it is characterised in that a diameter of 5~15mm of the aluminum steel.
7. according to the method described in claim 1, it is characterised in that in the molten steel:
C mass content is 3.2~4.1%;
Si mass content is 0.015~0.030%;
Mn mass content is 0.02~0.04%;
P mass content is 0.06~0.08%;
S mass content≤0.015%.
8. according to the method described in claim 1, it is characterised in that the oxygen content in the molten steel is 600~700ppm.
9. according to the method described in claim 1, it is characterised in that step (1) the anthracite carburant carries out the side of deoxidation Method is specially:
Anthracite carburant is added in molten steel tapping 1/3, makes the oxygen content in water of the steel after deoxidation≤150ppm.
10. according to the method described in claim 1, it is characterised in that the method for step (2) the aluminum steel deoxidation is specially:
Molten steel tapping carries out feeding aluminum steel deoxidation after finishing, and makes the oxygen content in water of the steel after deoxidation≤10ppm.
CN201710386168.4A 2017-05-26 2017-05-26 Alundum (Al2O3) inclusion method in one kind reduction semi-steel making steel billet Pending CN106967863A (en)

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