CN107142355A - One kind reduction converter semi-steel making deoxidation cost method - Google Patents
One kind reduction converter semi-steel making deoxidation cost method Download PDFInfo
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- CN107142355A CN107142355A CN201710385536.3A CN201710385536A CN107142355A CN 107142355 A CN107142355 A CN 107142355A CN 201710385536 A CN201710385536 A CN 201710385536A CN 107142355 A CN107142355 A CN 107142355A
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- steel
- deoxidation
- alfer
- molten steel
- aluminum
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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
- C21C7/06—Deoxidising, e.g. killing
-
- 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
- C21C7/0006—Adding metallic additives
-
- 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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention provides a kind of method for reducing converter semi-steel making deoxidation cost, including：Alfer is first added in molten steel and carries out deoxidation, aluminum steel is then added into the material after deoxidation continues deoxidation；The mass ratio of alfer and aluminum steel is (2~4)：1.Compared with prior art, the invention provides a kind of method of deoxidation for semi-steel making, preliminary deoxidation is first carried out to molten steel using alfer, further deoxidation is carried out to molten steel using aluminum steel again, and rationally control the usage ratio of alfer and aluminum steel, under the mating reaction of alfer and aluminum steel, in the case where ensureing that deoxidation effect is good, deoxidation cost is reduced.
Description
Technical field
The present invention relates to steelmaking technical field, more particularly to a kind of method for reducing converter semi-steel making deoxidation cost.
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.In order to reduce production cost and improve steel quality, efficient, high-quality, inexpensive deoxidization technique is developed necessary.
The content of the invention
In view of this, the invention provides a kind of method for reducing converter semi-steel making deoxidation cost, what the present invention was provided
Method of deoxidation cost is relatively low, and deoxidation effect is preferable.
The invention provides a kind of method for reducing converter semi-steel making deoxidation cost, including：
Alfer is first added into molten steel and carries out deoxidation；
Then aluminum steel is added into the material obtained after deoxidation and continues deoxidation；
The mass ratio of alfer and aluminum steel is (2~4)：1.
It is preferred that, Al mass content is 39~41% in the alfer.
It is preferred that, the granularity of the alfer is 20~50mm.
It is preferred that, the consumption of the alfer is 0.5~the 1.5 ‰ 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 alfer carries out deoxidation is specially：
Alfer is added in molten steel tapping 1/3, makes the oxygen content in water of the steel after deoxidation≤300ppm.
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 a kind of method of deoxidation for semi-steel making, first using alfer
Preliminary deoxidation is carried out to molten steel, then further deoxidation, and rationally control alfer and aluminum steel are carried out to molten steel using aluminum steel
Usage ratio, under the mating reaction of alfer and aluminum steel, it is ensured that in the case that deoxidation effect is good, reduce deoxidation into
This.
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 a kind of method for reducing converter semi-steel making deoxidation cost, comprise the following steps：
(1) alfer 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；
The mass ratio of alfer and aluminum steel is (2~4)：1.
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 of converter semi-steel making.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 quality contains
Amount is preferably 0.02~0.04%, more preferably 0.03%；P mass content is preferably 0.06~0.08%, more preferably
0.07%；S mass content is preferably≤0.015%.
Molten steel in the present invention is preferably the molten steel of converter semi-steel making, such as semisteel smelting DTLA steel grades, and specific 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 alfer to molten steel.In the present invention, Al in the alfer
Mass content is preferably 39~41%；P mass content is preferably≤0.05%；S mass content is preferably≤0.05%；C matter
Measure content preferably≤0.1%.In the present invention, the granularity of the alfer is preferably 20~50mm, more preferably 30~
40mm.In the present invention, the alfer is preferably without fusion hole, scum silica frost and is mixed with foreign impurity.The present invention is to described
The source of alfer can be bought by market and be obtained without special limitation.
In the present invention, the consumption of the alfer is preferably 0.5 ‰~the 1.5 ‰ of steel quality, more preferably
0.8 ‰~1.2 ‰, most preferably 1 ‰.
The present invention does not have special limitation to the method for the alfer deoxidation, using well known to those skilled in the art
The technical scheme of alfer deoxidation.In the present invention, the method for the alfer deoxidation is preferably：
Alfer is added in molten steel tapping 1/3 and carries out deoxidation, makes the oxygen content in water of the steel after deoxidation≤300ppm.
After alfer deoxidation, to deoxidation after add aluminum steel in obtained material and continue deoxidation.In the present invention, institute
State the mass content of Al in aluminum steel preferably >=99.5%；Si mass content is preferably≤0.15%；Fe mass content preferably≤
0.2%；Cu mass content is preferably≤0.02%.In the present invention, the surface preferred smooth of the aluminum steel, no wrinkle splits
Line, bubble, overlap, burr；Aluminum coil around it is neat, without intersection.In the present invention, the diameter of the aluminum steel is preferably 5~15mm,
More preferably 8~12mm, most preferably 10mm.The present invention, without special limitation, can be purchased to the source of the aluminum steel by market
Buy acquisition.
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, the mass ratio of the alfer and aluminum steel is preferably (2~4)：1, more preferably (2.5~
3.5)：1, most preferably 3:1.
In the present invention, the method for reduction converter semi-steel making deoxidation cost is preferably：
Molten steel is subjected to oxygen furnace steel, adding alfer in tapping 1/3 carries out deoxidation, makes the steel water oxygen after deoxidation
Content≤300ppm；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.
Raw materials used following examples of the present invention are commercial goods, and the composition of alfer used is：Al39.0~
41.0wt%；P≤0.05wt%；S≤0.05wt%；C≤0.10wt%；S≤1.0wt%；Granularity is 20~50ppm.It is used
The composition of aluminum steel is：Al >=99.5wt%, Si≤0.15wt%, Fe≤0.20wt%, Cu≤0.02wt%；Aluminum steel it is a diameter of
10mm。
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 0.02~0.04wt% of 3.2~4.1wt%, Si0.015~0.030wt%, 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, alfer 237Kg progress deoxidations, steel oxygen content in water after deoxidation are added in tapping 1/3
For 280ppm；390m is fed in tapping aluminum steel after finishing carries out deoxidation, and it is 5ppm to obtain the oxygen content in molten steel.(use converter pair
Constant temperature oxygen measuring probe is carried in oxygen content in rifle test molten steel, revolving furnace sublance)
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%,
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, alfer 240Kg progress deoxidations, steel oxygen content in water after deoxidation are added in tapping 1/3
For 260ppm；380m is fed in tapping aluminum steel after finishing carries out deoxidation, and it is 3ppm to obtain the oxygen content in molten steel.(use converter pair
Constant temperature oxygen measuring probe is carried in oxygen content in rifle test molten steel, revolving furnace sublance)
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, alfer 255Kg progress deoxidations, steel oxygen content in water after deoxidation are added in tapping 1/3
For 270ppm；390m is fed in tapping aluminum steel after finishing carries out deoxidation, and it is 8ppm to obtain the oxygen content in molten steel.(use converter pair
Constant temperature oxygen measuring probe is carried in oxygen content in rifle test molten steel, revolving furnace sublance)
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%,
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, 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)
Comparative example 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 above-mentioned steelmaking process, specific method is：
135 tons of molten steel steel-making, alfer 350Kg progress deoxidations, steel oxygen content in water after deoxidation are added in tapping 1/3
For 382ppm；250m is fed in tapping aluminum steel after finishing carries out deoxidation, and it is 18ppm to obtain the oxygen content in molten steel.(use converter pair
Constant temperature oxygen measuring probe is carried in oxygen content in rifle test molten steel, revolving furnace sublance)
Ferro-aluminum price is 8000 yuan/ton；Aluminum steel price is 12800 yuan/ton.
Embodiment 2 is compared with comparative example 1, and embodiment 2, which is reduced, uses alfer 318Kg, and 5.67 yuan of steel-making cost reduction/
Ton, and deoxidation effect is better than comparative example 1；The steel-making cost of comparative example 2 increases by 1.8 yuan/ton, deoxidation effect compared with Example 2
Fruit is worse than embodiment 2.From above example and comparative example, the method for deoxidation that the present invention is provided by control alfer and
Aluminum steel consumption, makes using cooperatively for alfer and aluminum steel, ensure that deoxidation effect it is good in the case of greatly reduction it is de-
Oxygen cost.
As seen from the above embodiment, the invention provides a kind of method for reducing converter semi-steel making deoxidation cost, including：
Alfer is first added in molten steel and carries out deoxidation, aluminum steel is then added into the material after deoxidation continues deoxidation；Alfer
Mass ratio with aluminum steel is (2~4)：1.Compared with prior art, the invention provides a kind of deoxidation side for semi-steel making
Method, first carries out preliminary deoxidation to molten steel using alfer, then carries out further deoxidation to molten steel using aluminum steel, and rationally controls
The usage ratio of alfer and aluminum steel processed, under the mating reaction of alfer and aluminum steel, good in guarantee deoxidation effect
In the case of, reduce deoxidation cost.
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. a kind of method for reducing converter semi-steel making deoxidation cost, comprises the following steps：
(1) alfer 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；
The mass ratio of alfer and aluminum steel is (2~4)：1.
2. according to the method described in claim 1, it is characterised in that in the alfer Al mass content be 39~
41%.
3. according to the method described in claim 1, it is characterised in that the granularity of the alfer is 20~50mm.
4. according to the method described in claim 1, it is characterised in that the consumption of the alfer is the 0.5 ‰ of steel quality
~1.5 ‰.
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) alfer carries out the method tool of deoxidation
Body is：
Alfer is added in molten steel tapping 1/3, makes the oxygen content in water of the steel after deoxidation≤300ppm.
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.
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| CN201710385536.3A CN107142355A (en) | 2017-05-26 | 2017-05-26 | One kind reduction converter semi-steel making deoxidation cost method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102260827A (en) * | 2010-05-26 | 2011-11-30 | 攀钢集团钢铁钒钛股份有限公司 | Drill collar steel and preparation method thereof |
| CN103614517A (en) * | 2013-11-18 | 2014-03-05 | 江苏省沙钢钢铁研究院有限公司 | Low-cost deoxygenation method for low-aluminum medium-carbon steel |
| CN103740883A (en) * | 2013-12-17 | 2014-04-23 | 攀钢集团西昌钢钒有限公司 | Deoxidation method of plain carbon steel |
-
2017
- 2017-05-26 CN CN201710385536.3A patent/CN107142355A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102260827A (en) * | 2010-05-26 | 2011-11-30 | 攀钢集团钢铁钒钛股份有限公司 | Drill collar steel and preparation method thereof |
| CN103614517A (en) * | 2013-11-18 | 2014-03-05 | 江苏省沙钢钢铁研究院有限公司 | Low-cost deoxygenation method for low-aluminum medium-carbon steel |
| CN103740883A (en) * | 2013-12-17 | 2014-04-23 | 攀钢集团西昌钢钒有限公司 | Deoxidation method of plain carbon steel |
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| 夏长松 等: "铝铁合金在转炉炼钢中的应用", 《南方金属》 * |
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Application publication date: 20170908 |