CN104046882A - Method for smelting austenitic stainless steel by utilizing waste magnesia-calcium bricks of AOD (argon oxygen decarbonization) converter - Google Patents
Method for smelting austenitic stainless steel by utilizing waste magnesia-calcium bricks of AOD (argon oxygen decarbonization) converter Download PDFInfo
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- CN104046882A CN104046882A CN201410248763.8A CN201410248763A CN104046882A CN 104046882 A CN104046882 A CN 104046882A CN 201410248763 A CN201410248763 A CN 201410248763A CN 104046882 A CN104046882 A CN 104046882A
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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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Abstract
The invention provides a method for smelting austenitic stainless steel by utilizing waste magnesia-calcium bricks of an AOD (argon oxygen decarbonization) converter. The technological process of the whole electric furnace is as follows: adding a completely cold material, energizing and smelting, adding auxiliary materials, blowing oxygen, adding waste magnesia-calcium brick particles in a melting down stage, detecting temperature, sampling, reducing, and tapping. The method for smelting the austenitic stainless steel by utilizing the waste magnesia-calcium bricks of the AOD converter has the advantages that the waste magnesia-calcium bricks of the AOD converter can be completely recycled, and completely replace light roasting dolomite for auxiliary slagging, MgO content of slag of an electric furnace is maintained to be 8-12%, corrosion rate of magnesia-carbon brick working lining of the electric furnace is reduced, the slag hanging effect of the electric furnace is improved, and utilization rate is more than 18kg per ton of molten steel.
Description
Technical field
The present invention relates to stainless steel smelting technical field, be specifically related to the method that the discarded magnesia-calcium brick of a kind of AOD of utilization converter is smelted austenitic stainless steel.
Background technology
Discarded magnesia-calcium brick after stainless steel AOD converter is rolled off the production line is processed by the discarded industrial refuse of metallurgy for a long time always, and this can cause a large amount of magnesia-calcium brick wastings of resources on the one hand, on the other hand can severe contamination plant area and surrounding environment.
In stainless steel electrosmelting process, for reducing electric furnace working lining magnesia carbon brick erosive velocity and improving furnace wall dross effect, MgO content in electric-furnace slag must be adjusted to 8～12% scope.Traditional technology, in the process of electrosmelting austenitic stainless steel, by adding the mode of light dolomite to ensure the content of MgO in slag, causes the raising of smelting cost.
Summary of the invention
The present invention is directed to problems of the prior art a kind of AOD of utilization converter method that discarded magnesia-calcium brick is smelted austenitic stainless steel is provided, it comprises following processing step:
the low nickel pig iron and steel scrap are added in electric furnace according to the mass ratio of 1～3:1, and energising is molten into molten steel, in this molten steel, adds lime, and wherein the mass ratio of lime and the low nickel pig iron and steel scrap total mass is 1:15～20;
to discard magnesia-calcium brick and add above-mentioned steps from high hopper
in the molten steel obtaining, the mass ratio of discarded magnesia-calcium brick and the low nickel pig iron and steel scrap total mass is 1:40～50;
The particulate component of described discarded magnesia-calcium brick is, C:0.16～7.0%, SiO
2: 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;
from electric stove door oxygen rifle to above-mentioned steps
in the molten steel obtaining, spray into carbon dust, the mass ratio of carbon dust and the low nickel pig iron and steel scrap total mass is 1:150～200; From electric stove door oxygen rifle, be blown into 20～25m simultaneously
3the oxygen of/ton molten steel;
Described step
molten steel temperature>=1580 DEG C that obtain, 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;
from electric stove door oxygen rifle to above-mentioned steps
the ferrosilicon powder that to add with the mass ratio of the low nickel pig iron and steel scrap total mass in the molten steel obtaining be 1:300～400, is blown into 0.3～0.4 m simultaneously from electric stove door oxygen rifle
3the nitrogen of/ton molten steel;
by above-mentioned steps
the molten steel obtaining is poured into and is baked in 700～900 DEG C of ladles from the electric furnace of 1580 DEG C～1640 DEG C;
by step
the molten steel obtaining in ladle is watered and is cast out qualified austenitic stainless steel by AOD converter-LF refining furnace-continuous casting common process.
The present invention is relative, and prior art has the following advantages:
The present invention can all recycle discarded stainless steel AOD converter magnesia-calcium brick, and 100% substitutes the auxiliary slag making of light dolomite, and MgO content in electric-furnace slag is remained on to 8～12% scope; The present invention has reduced electric furnace working lining magnesia carbon brick erosive velocity and has improved furnace wall dross effect, and its utilization ratio is that a ton molten steel is greater than 18kg; The present invention has reduced stainless steel-making cost and has realized waste and old material cycling and reutilization.
Embodiment
Embodiment 1
Electrosmelting 304 stainless steel molten steel.
1. fragmentation: the discarded magnesia-calcium brick after stainless steel AOD converter smelting is used carries out fragmentation.
2. screening: sieve out the particle that granularity is 60mm, be put in electric furnace high hopper.
3. electric furnace adds all cold charge: the solid material in material basket is joined in electric furnace, and material basket Intake Quantity is 84 tons, wherein 63 tons of the low nickel pig iron, 21 tons of steel scraps.
4. energising is smelted: be divided into the starting the arc, Chuan Jing, fusing three phases.
5. add auxiliary material, oxygen blast: fire door cleaning, oxygen blast is fluxed, and feed bin starts to add lime slag making simultaneously, and add-on is 4.2 tons.
6. the molten clear stage adds discarded magnesia-calcium brick particle: after melting clearly, will discard magnesia-calcium brick particle and join electric furnace from high hopper, add-on is 2.1 tons, and from furnace door oxygen lance, is blown into oxygen, spray carbon dust making foamed slag.The oxygen amount of being blown into is 20m
3/ ton molten steel, carbon dust straying quatity is 0.56 ton; Magnesia-calcium brick particulate component is SiO
2: 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 the demands, start to add ferrosilicon powder reduction, blow N simultaneously
2stir, ferrosilicon powder add-on is 0.28 ton, N
2the amount of being blown into is 0.3m
3/ ton molten steel.
9. tapping: molten steel is poured in baked ladle into ladle baking to 800 DEG C at 1610 DEG C from electric furnace.
Detecting MgO content in slag is that the discarded magnesia-calcium brick utilization ratio of 12.0%, AOD converter is 18kg
/ ton molten steel.
Embodiment 2
Electrosmelting 304 stainless steel molten steel.
1. fragmentation: the discarded magnesia-calcium brick after stainless steel AOD converter smelting is used carries out fragmentation.
2. screening: sieve out the particle that granularity is 40mm, be put in electric furnace high hopper.
3. electric furnace adds all cold charge: the solid material in material basket is joined in electric furnace, and material basket Intake Quantity is 95 tons, wherein 70 tons of the low nickel pig iron, 25 tons of steel scraps.
4. energising is smelted: be divided into the starting the arc, Chuan Jing, fusing three phases.。
5. add auxiliary material, oxygen blast: fire door cleaning, oxygen blast is fluxed, and feed bin starts to add lime slag making simultaneously, and add-on is 5.3 tons.
6. the molten clear stage adds discarded magnesia-calcium brick particle: after melting clearly, will discard magnesia-calcium brick particle and join electric furnace from high hopper, add-on is 1.9 tons, and from furnace door oxygen lance, is blown into oxygen, spray carbon dust making foamed slag; The oxygen amount of being blown into is 25Nm
3/ ton molten steel, carbon dust straying quatity is 0.475 ton; Magnesia-calcium brick particulate component is, SiO
2: 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 the demands, start to add ferrosilicon powder reduction, blow N simultaneously
2stir; Ferrosilicon powder add-on is 0.2375 ton, N
2the amount of being blown into is 0.4 m
3/ ton molten steel.
9. tapping: molten steel is poured in baked ladle into ladle baking to 900 DEG C at 1580 DEG C from electric furnace.
Detecting MgO content in slag is that the discarded magnesia-calcium brick utilization ratio of 8.0%, AOD converter is 20kg/ ton molten steel.
Embodiment 3
Electrosmelting 304 stainless steel molten steel.
1. fragmentation: the discarded magnesia-calcium brick after stainless steel AOD converter smelting is used carries out fragmentation.
2. screening: sieve out the particle that granularity is 10mm, be put in electric furnace high hopper.
3. electric furnace adds all cold charge: the solid material in material basket is joined in electric furnace, and material basket Intake Quantity is 90 tons, wherein 75 tons of the low nickel pig iron, 15 tons of steel scraps.
4. energising is smelted: be divided into the starting the arc, Chuan Jing, fusing three phases.
5. add auxiliary material, oxygen blast: fire door cleaning, oxygen blast is fluxed, and feed bin starts to add lime slag making simultaneously, and add-on is 6 tons.
6. the molten clear stage adds discarded magnesia-calcium brick particle: after melting clearly, will discard magnesia-calcium brick particle and join electric furnace from high hopper, add-on is 2 tons, and from furnace door oxygen lance, is blown into oxygen, spray carbon dust making foamed slag; The oxygen amount of being blown into is 24Nm
3/ ton molten steel, carbon dust straying quatity is 0.5 ton.Magnesia-calcium brick particulate component is, SiO
2: 3.0%, CaO:25.0%, MgO:66.0%, other are 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 the demands, start to add ferrosilicon powder reduction, blow N simultaneously
2stir; Ferrosilicon powder add-on is 0.25 ton, N
2the amount of being blown into is 0.35 m
3/ ton molten steel.
9. tapping: molten steel is poured in baked ladle into ladle baking to 700 DEG C at 1640 DEG C from electric furnace.
Detecting MgO content in slag is that the discarded magnesia-calcium brick utilization ratio of 9.1%, AOD converter is 19kg/ ton molten steel.
Claims (4)
1. a method of utilizing the discarded magnesia-calcium brick of AOD converter to smelt austenitic stainless steel, is characterized in that, comprises following processing step:
the low nickel pig iron and steel scrap are added in electric furnace according to the mass ratio of 2.8～5:1, and energising is molten into molten steel, in this molten steel, adds lime, and wherein the mass ratio of lime and the low nickel pig iron and steel scrap total mass is 1:15～20;
to discard magnesia-calcium brick and add above-mentioned steps from high hopper
in the molten steel obtaining, the mass ratio of discarded magnesia-calcium brick and the low nickel pig iron and steel scrap total mass is 1:40～50;
from electric stove door oxygen rifle to above-mentioned steps
in the molten steel obtaining, spray into carbon dust, the mass ratio of carbon dust and the low nickel pig iron and steel scrap total mass is 1:150～200; From electric stove door oxygen rifle, be blown into 20～25m simultaneously
3the oxygen of/ton molten steel;
from electric stove door oxygen rifle to above-mentioned steps
the ferrosilicon powder that to add with the mass ratio of the low nickel pig iron and steel scrap total mass in the molten steel obtaining be 1:300～400, is blown into 0.3～0.4 m simultaneously from electric stove door oxygen rifle
3the nitrogen of/ton molten steel;
by above-mentioned steps
the molten steel obtaining is poured into and is baked in 700～900 DEG C of ladles from the electric furnace of 1580 DEG C～1640 DEG C;
by step
the molten steel obtaining in ladle is watered and is cast out qualified austenitic stainless steel by AOD converter-LF refining furnace-continuous casting common process.
2. a kind of method of utilizing the discarded magnesia-calcium brick of AOD converter to smelt austenitic stainless steel as claimed in claim 1, is characterized in that: described step
in the particulate component of discarded magnesia-calcium brick be, C:0.16～7.0%, SiO
2: 2.4～4.4%, CaO:12.0～30.0%, MgO:64.0～78.0%.
3. a kind of method of utilizing the discarded magnesia-calcium brick of AOD converter to smelt austenitic stainless steel as claimed in claim 1 or 2, is characterized in that: the granularity of described discarded magnesia-calcium brick is 10mm～60mm.
4. a kind of method of utilizing the discarded magnesia-calcium brick of AOD converter to smelt austenitic stainless steel as claimed in claim 3, is characterized in that: described step
molten steel temperature>=1580 DEG C that obtain, 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 |
|---|---|---|---|
| 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 CN104046882B (en) | 2016-08-24 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108085577A (en) * | 2017-11-13 | 2018-05-29 | 唐山市德龙钢铁有限公司 | A kind of smelting process for 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 |
| CN115927788A (en) * | 2023-01-03 | 2023-04-07 | 中冶赛迪工程技术股份有限公司 | Ultralow-carbon-nitrogen molten steel and smelting method thereof |
| CN115927788B (en) * | 2023-01-03 | 2024-10-22 | 中冶赛迪工程技术股份有限公司 | Ultralow-carbon-nitrogen molten steel and smelting method thereof |
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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 |
| CN101768656A (en) * | 2008-12-31 | 2010-07-07 | 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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2014
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101768656A (en) * | 2008-12-31 | 2010-07-07 | 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 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108085577A (en) * | 2017-11-13 | 2018-05-29 | 唐山市德龙钢铁有限公司 | A kind of smelting process for improving ton steel scrap ratio |
| 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 |
| CN115927788A (en) * | 2023-01-03 | 2023-04-07 | 中冶赛迪工程技术股份有限公司 | Ultralow-carbon-nitrogen molten steel and smelting method thereof |
| CN115927788B (en) * | 2023-01-03 | 2024-10-22 | 中冶赛迪工程技术股份有限公司 | Ultralow-carbon-nitrogen molten steel and smelting method thereof |
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