CN104046882B - The method that magnesia-calcium brick smelts austenitic stainless steel is discarded in a kind of AOD of utilization converter - Google Patents
The method that magnesia-calcium brick smelts austenitic stainless steel is discarded in a kind of AOD of utilization converter Download PDFInfo
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- CN104046882B CN104046882B CN201410248763.8A CN201410248763A CN104046882B CN 104046882 B CN104046882 B CN 104046882B CN 201410248763 A CN201410248763 A CN 201410248763A CN 104046882 B CN104046882 B CN 104046882B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The invention provides a kind of AOD of utilization converter and discard the method that magnesia-calcium brick smelts austenitic stainless steel, whole eaf process flow process is: smelting adds auxiliary material, the oxygen blast melting down stage adds discarded magnesia-calcium brick particle thermometric, sampling reduction tapping to add all cold charge energising；Stainless steel AOD converter can be discarded magnesia-calcium brick and all be recycled by the present invention, 100% substitutes light dolomite auxiliary slag making, content of MgO in electric-furnace slag is maintained at the scope of 8～12%, reducing electric furnace working lining magnesia carbon brick erosive velocity and improve furnace wall dross effect, its utilization rate is that ton molten steel is more than 18kg.
Description
Technical field
The present invention relates to stainless steel smelting technical field, be specifically related to one utilize AOD converter discard magnesia-calcium brick smelt Austria
The stainless method of family name.
Background technology
Discarded magnesia-calcium brick after stainless steel AOD converter is rolled off the production line is discarded at industrial refuse by metallurgy the most always
Reason, on the one hand this can cause a large amount of magnesia-calcium brick wasting of resources, on the other hand meeting severe contamination plant area and surrounding environment.
During stainless steel electric furnace smelting, for reducing electric furnace working lining magnesia carbon brick erosive velocity and improving furnace wall dross effect
Really, it is necessary to the scope that content of MgO in electric-furnace slag is adjusted to 8～12%.Traditional handicraft is at electric furnace smelting austenitic stainless steel
During, by the way of adding light dolomite, ensure the content of MgO in slag, cause the raising of smelting cost.
Summary of the invention
The present invention is directed to problems of the prior art provides one to utilize AOD converter to discard magnesia-calcium brick smelting Ovshinsky not
The method of rust steel, it includes following processing step:
Adding in electric furnace by the low nickel pig iron and steel scrap according to the mass ratio of 1～3:1, energising is molten into molten steel, to this steel
Adding lime in liquid, wherein lime is 1:15～20 with the mass ratio of the low nickel pig iron and steel scrap gross mass；
Discarded magnesia-calcium brick is added above-mentioned steps from high hopperIn the molten steel obtained, discarded magnesia-calcium brick and low nickel
The mass ratio of the pig iron and steel scrap gross mass is 1:40～50；
The particulate component of described discarded magnesia-calcium brick is, C:0.16～7.0%, SiO2: 2.4～4.4%, CaO:12.0～
30.0%, MgO:64.0～78.0%；
The granularity of described discarded magnesia-calcium brick is 10mm～60mm；
To above-mentioned steps from electric stove door oxygen rifleThe molten steel obtained sprays into carbon dust, carbon dust and the low nickel pig iron and
The mass ratio of steel scrap gross mass is 1:150～200；From electric stove door oxygen rifle, it is blown into 20～25m simultaneously3The oxygen of/ton molten steel；
Described stepMolten steel temperature >=1580 DEG C obtained, composition is C:1.5～2.0%, Si:0.30～0.60%,
Mn:0.10～0.25%, P≤0.043%, S≤0.2%, Cr:6.0～7.0%, Ni:9.0～10.0%, other is Fe and residual
Stay element；
To above-mentioned steps from electric stove door oxygen rifleThe molten steel obtained adds and the low nickel pig iron and steel scrap gross mass
The ferrosilicon powder that mass ratio is 1:300～400, simultaneously from electric stove door oxygen rifle, be blown into 0.3～0.4 m3The nitrogen of/ton molten steel
Gas；
By above-mentioned stepsThe molten steel obtained is poured into from the electric furnace of 1580 DEG C～1640 DEG C and is baked to 700～900 DEG C of steel
In bag；
By stepThe molten steel obtained in ladle is watered cast out conjunction by AOD converter-LF refining furnace-continuous casting common process
The austenitic stainless steel of lattice.
Hinge structure of the present invention has the advantage that
Stainless steel AOD converter can be discarded magnesia-calcium brick and all be recycled by the present invention, and 100% substitutes light dolomite
Auxiliary slag making, is maintained at the scope of 8～12% by content of MgO in electric-furnace slag；Present invention reduces electric furnace working lining magnesia carbon brick to invade
Erosion speed also improves furnace wall dross effect, and its utilization rate is that ton molten steel is more than 18kg；Present invention reduces stainless steel-making
This also realizes waste and old material cycling and reutilization.
Detailed description of the invention
Embodiment 1
Electric furnace smelting 304 stainless steel molten steel.
1. broken: the discarded magnesia-calcium brick after stainless steel AOD converter smelting is crushed.
2. screening: screen out the particle that granularity is 60mm, be put in electric furnace high hopper.
3. electric furnace adds all cold charge: join in electric furnace by the solid material in material basket, and material basket charge weight is 84 tons, the lowest nickel
The pig iron 63 tons, steel scrap 21 tons.
4. energising is smelted: be divided into the starting the arc, Chuan Jing, fusing three phases.
5. adding auxiliary material, oxygen blast: fire door is cleared up, oxygen blast is fluxed, and feed bin starts to add lime slag making simultaneously, and addition is 4.2 tons.
The most melting down stage adds discarded magnesia-calcium brick particle: after melting down, from high hopper, discarded magnesia-calcium brick particle is joined electricity
In stove, addition is 2.1 tons, and is blown into oxygen, spray carbon dust making foamed slag from furnace door oxygen lance.The oxygen amount of being blown into is 20m3/ ton
Molten steel, carbon dust straying quatity is 0.56 ton；Magnesia-calcium brick particulate component is SiO2: 2.4%, CaO:12.0, MgO:78.0%, other are C
And relict element.
7. thermometric, sampling: molten steel temperature is 1580 DEG C, composition is C:1.85%, Si:0.60%, Mn:0.10%, P:
0.035%, S:0.2%, Cr:6.0%, Ni:9.0%, other is Fe and relict element.
8. reduction: after temperature and composition meet requirement, starts to add ferrosilicon powder reduction, blows N simultaneously2Stirring, ferrosilicon powder adds
Amount is 0.28 ton, N2The amount of being blown into is 0.3m3/ ton molten steel.
9. tapping: molten steel is poured in baked ladle at 1610 DEG C from electric furnace, ladle baking to 800 DEG C.
In detection slag, content of MgO is 12.0%, and it is 18kg that magnesia-calcium brick utilization rate is discarded in AOD converter
/ ton molten steel.
Embodiment 2
Electric furnace smelting 304 stainless steel molten steel.
1. broken: the discarded magnesia-calcium brick after stainless steel AOD converter smelting is crushed.
2. screening: screen out the particle that granularity is 40mm, be put in electric furnace high hopper.
3. electric furnace adds all cold charge: join in electric furnace by the solid material in material basket, and material basket charge weight is 95 tons, the lowest nickel
The pig iron 70 tons, steel scrap 25 tons.
4. energising is smelted: be divided into the starting the arc, Chuan Jing, fusing three phases..
5. adding auxiliary material, oxygen blast: fire door is cleared up, oxygen blast is fluxed, and feed bin starts to add lime slag making simultaneously, and addition is 5.3 tons.
The most melting down stage adds discarded magnesia-calcium brick particle: after melting down, from high hopper, discarded magnesia-calcium brick particle is joined electricity
In stove, addition is 1.9 tons, and is blown into oxygen, spray carbon dust making foamed slag from furnace door oxygen lance；The oxygen amount of being blown into is 25Nm3/ ton
Molten steel, carbon dust straying quatity is 0.475 ton；Magnesia-calcium brick particulate component is, SiO2: 4.4%, CaO:30.0%, MgO:64.0%,
Other are C and relict element.
7. thermometric, sampling: molten steel temperature is 1590 DEG C, composition is C:1.5%, Si:0.52%, Mn:0.18%, P:
0.043%, S:0.16%, Cr:6.6%, Ni:10.0%, other is Fe and relict element.
8. reduction: after temperature and composition meet requirement, starts to add ferrosilicon powder reduction, blows N simultaneously2Stirring；Ferrosilicon powder adds
Amount is 0.2375 ton, N2The amount of being blown into is 0.4 m3/ ton molten steel.
9. tapping: molten steel is poured in baked ladle at 1580 DEG C from electric furnace, ladle baking to 900 DEG C.
In detection slag, content of MgO is 8.0%, and it is 20kg/ ton molten steel that magnesia-calcium brick utilization rate is discarded in AOD converter.
Embodiment 3
Electric furnace smelting 304 stainless steel molten steel.
1. broken: the discarded magnesia-calcium brick after stainless steel AOD converter smelting is crushed.
2. screening: screen out the particle that granularity is 10mm, be put in electric furnace high hopper.
3. electric furnace adds all cold charge: join in electric furnace by the solid material in material basket, and material basket charge weight is 90 tons, the lowest nickel
The pig iron 75 tons, steel scrap 15 tons.
4. energising is smelted: be divided into the starting the arc, Chuan Jing, fusing three phases.
5. adding auxiliary material, oxygen blast: fire door is cleared up, oxygen blast is fluxed, and feed bin starts to add lime slag making simultaneously, and addition is 6 tons.
The most melting down stage adds discarded magnesia-calcium brick particle: after melting down, from high hopper, discarded magnesia-calcium brick particle is joined electricity
In stove, addition is 2 tons, and is blown into oxygen, spray carbon dust making foamed slag from furnace door oxygen lance；The oxygen amount of being blown into is 24Nm3/ ton steel
Liquid, carbon dust straying quatity is 0.5 ton.Magnesia-calcium brick particulate component is, SiO2: 3.0%, CaO:25.0%, MgO:66.0%, other
For C and relict element.
7. thermometric, sampling: molten steel temperature is 1600 DEG C, composition is C:2.0%, Si:0.3%, Mn:0.25%, P:
0.04%, S:0.18%, Cr:7.0%, Ni:10.0%, other is Fe and relict element.
8. reduction: after temperature and composition meet requirement, starts to add ferrosilicon powder reduction, blows N simultaneously2Stirring；Ferrosilicon powder adds
Amount is 0.25 ton, N2The amount of being blown into is 0.35 m3/ ton molten steel.
9. tapping: molten steel is poured in baked ladle at 1640 DEG C from electric furnace, ladle baking to 700 DEG C.
In detection slag, content of MgO is 9.1%, and it is 19kg/ ton molten steel that magnesia-calcium brick utilization rate is discarded in AOD converter.
Claims (4)
1. one kind utilizes AOD converter to discard the method that magnesia-calcium brick smelts austenitic stainless steel, it is characterised in that include that following technique walks
Rapid:
Adding in electric furnace by the low nickel pig iron and steel scrap according to the mass ratio of 2.8～5:1, energising is molten into molten steel, in this molten steel
Adding lime, wherein lime is 1:15～20 with the mass ratio of the low nickel pig iron and steel scrap gross mass；
Discarded magnesia-calcium brick is added above-mentioned steps from high hopperIn the molten steel obtained, discarded magnesia-calcium brick and the low nickel pig iron and
The mass ratio of steel scrap gross mass is 1:40～50；
To above-mentioned steps from electric stove door oxygen rifleSpraying into carbon dust in the molten steel obtained, carbon dust is total with the low nickel pig iron and steel scrap
The mass ratio of quality is 1:150～200；From electric stove door oxygen rifle, it is blown into 20～25m simultaneously3The oxygen of/ton molten steel；
To above-mentioned steps from electric stove door oxygen rifleThe molten steel obtained adds and the low nickel pig iron and the quality of steel scrap gross mass
Than the ferrosilicon powder for 1:300～400, from electric stove door oxygen rifle, it is blown into 0.3～0.4 m simultaneously3The nitrogen of/ton molten steel；
By above-mentioned stepsThe molten steel obtained is poured into from the electric furnace of 1580 DEG C～1640 DEG C and is baked in 700～900 DEG C of ladles；
By stepThe molten steel obtained in ladle is watered cast out qualified Austria by AOD converter-LF refining furnace-continuous casting common process
Family name's body stainless steel.
The method that magnesia-calcium brick smelts austenitic stainless steel is discarded in a kind of AOD of utilization converter, and its feature exists
In: described stepIn the particulate component of discarded magnesia-calcium brick be, C:0.16～7.0%, SiO2: 2.4～4.4%, CaO:12.0～
30.0%, MgO:64.0～78.0%.
The method that magnesia-calcium brick smelts austenitic stainless steel is discarded in a kind of AOD of utilization converter, and it is special
Levy and be: the granularity of described discarded magnesia-calcium brick is 10mm～60mm.
The method that magnesia-calcium brick smelts austenitic stainless steel is discarded in a kind of AOD of utilization converter, and its feature exists
In: described stepMolten steel temperature >=1580 DEG C obtained, composition is C:1.5～2.0%, Si:0.30～0.60%, Mn:0.10
～0.25%, P≤0.043%, S≤0.2%, Cr:6.0～7.0%, Ni:9.0～10.0%, other is Fe and relict element.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410248763.8A CN104046882B (en) | 2014-06-06 | 2014-06-06 | The method that magnesia-calcium brick smelts austenitic stainless steel is discarded in a kind of AOD of utilization converter |
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| CN201410248763.8A CN104046882B (en) | 2014-06-06 | 2014-06-06 | The method that magnesia-calcium brick smelts austenitic stainless steel is discarded in a kind of AOD of utilization converter |
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| CN104046882B true CN104046882B (en) | 2016-08-24 |
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| CN108085577B (en) * | 2017-11-13 | 2019-05-24 | 唐山市德龙钢铁有限公司 | A kind of smelting process improving ton steel scrap ratio |
| CN109680119A (en) * | 2019-01-31 | 2019-04-26 | 武汉科技大学 | A kind of secondary magnesium carbon making foamed slag agent and its preparation method and application |
| CN110923396A (en) * | 2019-10-31 | 2020-03-27 | 张家港宏昌钢板有限公司 | Method for recycling waste steel ladle magnesia carbon bricks |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS61147805A (en) * | 1984-12-18 | 1986-07-05 | Kawasaki Steel Corp | Treatment of molten iron to be used in production of stainless steel |
| CN1110330A (en) * | 1994-04-04 | 1995-10-18 | 王幼君 | Method for smelting iron alloy containing manganese and silicon in midfrequency electric furnace |
| CN101768656B (en) * | 2008-12-31 | 2011-08-24 | 宝山钢铁股份有限公司 | Method for refining ultra-low carbon ferritic stainless steel under vacuum |
| CN103667589A (en) * | 2013-12-04 | 2014-03-26 | 蚌埠华泰特种钢有限公司 | Two-step method for producing austenitic stainless steel by using stainless steel scrap |
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