CN101235463A - Technique for directly smelting stainless steel from dephosphorization blast furnace molten iron in furnace - Google Patents
Technique for directly smelting stainless steel from dephosphorization blast furnace molten iron in furnace Download PDFInfo
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- CN101235463A CN101235463A CNA2007100030990A CN200710003099A CN101235463A CN 101235463 A CN101235463 A CN 101235463A CN A2007100030990 A CNA2007100030990 A CN A2007100030990A CN 200710003099 A CN200710003099 A CN 200710003099A CN 101235463 A CN101235463 A CN 101235463A
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Abstract
The invention provides a technique for dephosphorizing blast furnace iron melt in a furnace and directly smelting stainless steel, and the technique comprises following steps: firstly, dephosphorizing raw material iron melt which contains nickel and chrome in a blast furnace, enabling the content of phosphor to be lower than 0.035%, adding quick lime slag 3-18% into molten steel each ton, secondly, adding nitrogen gas or argon gas and oxygen to use together, wherein the blowing oxygen quantity of the molten steel each ton is 0.8-2 cubic meters, the argon gas is 0.4-1.2 cubic meters, the nitrogen gas is 0.5-1.5 cubic meters, obtaining finished products, adding stainless steel pregnant antimony solution, and outputting the molten steel after the content of main components of the molten steel in an electric furnace reaches the following standards through slightly mixing. The standards are that chrome is 8-18%, nickel is 0.8-8.5%, manganese is 5.5-14%, copper is 1.5-3.2%, carbon is less than 0.15%, silicon is less than 1%, sulfur is less than 0.03%, phosphor is less than 0.035%, iron is 65-83%, and each metal content can be conditioned in the electric furnace and a sub oxygen furnace according to the quality standards of products.
Description
Technical field:
The present invention relates to stainless steel-making process, particularly utilize the technology of directly smelting stainless steel from dephosphorization blast furnace molten iron in furnace.
Background technology:
Stainless steel smelting common process path is now: electric furnace → AOD → LF or VOD, and adopt steel scrap/alloy in electric furnace, to melt the back and add specific mother liquor of stainless steel, drop into the AOD stove again and carry out refining.Its shortcoming yields poorly for heat energy is made full use of.
Also have a kind of smelting technology to skip the electric furnace operation, adopt blast-melted/alloy through after the extra furnace dephosphorization in the AOD stove direct smelting stainless steel (for example CN1796585), its shortcoming is extra furnace dephosphorization, production cost height, quality instability.
In the applicant CN1743476A and CN1733950A Chinese patent application before this, disclose the technology of nickel oxide ore, but do not disclosed the method for dephosphorization in the blast furnace through the blast-furnace smelting ferronickel.Still need continue to use traditional method with ferronickel product smelting stainless steel.
Summary of the invention:
The present invention is intended to overcome the deficiencies in the prior art, and a kind of technology of utilizing the blast-melted direct smelting stainless steel of dephosphorization in the stove is provided.
Above-mentioned purpose of the present invention is to realize by following technical scheme.
The technology of utilizing directly smelting stainless steel from dephosphorization blast furnace molten iron in furnace provided by the present invention mainly comprises the steps:
1) with Ni and Cr contained raw material molten iron dephosphorization in blast furnace, make phosphorus content at (weight percent meter, down together) below 0.035%, add in electric furnace or the inferior oxygen stove and smelt, molten steel per ton adds the slag making of 3-18% unslaked lime;
2) adding nitrogen/argon gas and oxygen use jointly in the smelting process, and molten steel blowing oxygen quantity wherein per ton is the 0.8-2 cubic meter, argon gas 0.4-1.2 cubic meter, and nitrogen 0.5-1.5 cubic meter goes out molten steel and gets finished product.
Phosphorus falls in the interior dephosphorization of blast furnace to be realized by following method: dephosphorization blast furnace molten iron in furnace is by nickel oxide raw ore adding Wingdale or silica dual alkalinity to be adjusted to 0.4-0.7, add Wingdale and breeze again and carry out sintering, obtain the agglomerate of dual alkalinity 0.5-0.8, agglomerate is further gone into blast-furnace smelting obtain the nickel chromium triangle molten iron of phosphorus content below 0.035%.
The present invention further adopts following scheme: also add mother liquor of stainless steel in smelting process, through the fine setting in electric furnace in the molten steel content of main component go out molten steel after reaching following standard, wherein said standard is: chromium 8-18%, nickel 0.8-8.5%, manganese 5.5-14%, carbon is less than 0.15%, silicon is less than 1%, sulphur is less than 0.03%, and phosphorus is less than 0.035%, iron 65-83%.
The present invention further adopts following technical scheme: wherein preferred adding molten steel blowing oxygen quantity per ton is 0.8 cubic metre, 0.5 cubic metre of argon gas, 0.6 cubic metre of nitrogen.
The present invention further adopts following technical scheme: the nickel-chromium pig iron mother liquor that described mother liquor of stainless steel adopts nickel oxide ore to form through blast-furnace smelting.
The present invention further adopts following technical scheme: the nickel-chromium pig iron mother liquor that described mother liquor of stainless steel adopts nickel oxide ore and stainless steel industry waste to form through blast-furnace smelting.
Compared with prior art, stainless steel-making process provided by the present invention can fall the heating molten steel of phosphorus directly into electric furnace with dephosphorization in blast furnace, save heat energy, molten steel per ton can be saved the 700-800 degree, improve output, reduce extra furnace dephosphorization link and cost thereof, thereby reduce total cost, make element such as nickel chromium iron be fully used.Regulate component with mother liquor of stainless steel, particularly with nickel oxide ore through the nickel-chromium pig iron mother liquor that blast-furnace smelting forms, make full use of discarded ore deposit.
Embodiment:
Engage specific embodiment below the present invention is further explained, the following example does not limit protection scope of the present invention, and all modification and adjustment of making based on thought of the present invention all belong to the scope of protection of the invention.
The raw material molten iron can be from the hot stove in blast furnace, electric furnace or ore deposit among the embodiment.All content are calculated by weight percentage herein.
Embodiment 1
1) with Ni and Cr contained raw material molten iron dephosphorization in blast furnace, make phosphorus content, add in the electric furnace and smelt below 0.035%, carbon containing 2.5-3.5% in the raw material molten iron, silicone content 2-3%, molten steel per ton add the slag making of 3-9% unslaked lime;
2) add nitrogen/argon gas and oxygen, wherein, molten steel blowing oxygen quantity per ton is 1.8 cubic metres, 1.2 cubic metres of argon gas, and 1.5 cubic metres of nitrogen obtain finished product.
Embodiment 2
1) with Ni and Cr contained raw material molten iron dephosphorization in blast furnace, make phosphorus content, add in the electric furnace and smelt below 0.035%, carbon containing 2.5-3.5% in the raw material molten iron, silicone content 1-2%, molten steel per ton add the slag making of 10-12% unslaked lime;
2) add nitrogen/argon gas and oxygen, wherein, molten steel blowing oxygen quantity per ton is 1.2 cubic metres, 0.6 cubic metre of argon gas, 0.6 cubic metre of nitrogen,, add phosphorus content at the mother liquor of stainless steel below 0.035%, after go out molten steel;
Finished product can reach following technological standards: phosphorus＜0.035%, carbon＜0.15%, silicon＜1%, nickel 8.1-8.4%, chromium 17-17.5%, iron 72-75%, sulphur＜0.03%.
Embodiment 3
1) with Ni and Cr contained raw material molten iron dephosphorization in blast furnace, make phosphorus content below 0.035%, carbon content is at 3-4%, and silicon 1.5-2%, molten steel wherein per ton add the slag making of 12-18% unslaked lime;
2) add nitrogen/argon gas and oxygen, wherein, molten steel blowing oxygen quantity per ton is 0.8 cubic metre, 0.5 cubic metre of argon gas, and 0.6 cubic metre of nitrogen obtains finished product.
Embodiment 4
On the basis of embodiment 3, add the mother liquor of stainless steel of phosphorus＜0.035%, carbon 3.5-4%, silicon 2-3%, sulphur 0.08-0.3%, nickel 4-5%, chromium 8-15%, manganese 5.5-14%, iron 78-81%, after reaching standard, go out molten steel;
Finished product can reach following technological standards: phosphorus＜0.035%, carbon＜0.15%, silicon＜1%, nickel 4.5-5%, chromium 10-12%, iron 79.5-83%, manganese 6-10%, sulphur＜0.03%.
Embodiment 5
1) with Ni and Cr contained molten iron dephosphorization in blast furnace, make phosphorus content below 0.035%, molten steel wherein per ton adds 10% unslaked lime slag making;
2) add nitrogen/argon gas and oxygen, wherein, molten steel blowing oxygen quantity per ton is 0.8 cubic metre, 0.4 cubic metre of argon gas, and 0.5 cubic metre of nitrogen obtains finished product.
Embodiment 6
On the basis of embodiment 5, add the mother liquor of stainless steel of phosphorus＜0.035%, silicon 0.8-1%, sulphur＜0.03%, nickel 0.85-1.6%, chromium 12-15%, iron 66-81%, manganese 5.5-13%, copper 1.5-3%, after reaching standard, go out molten steel
Finished product can reach following technological standards: phosphorus＜0.035%, carbon＜0.15%, silicon＜1%, nickel 0.8-1.6%, chromium 10-13%, iron 66-83%, sulphur＜0.03%, manganese 11-12%, copper 2-3.2%.
Require various amounts of metal all can in electric furnace, inferior oxygen stove, nurse one's health according to target level of product quality.
Claims (6)
1. the technology of a directly smelting stainless steel from dephosphorization blast furnace molten iron in furnace, wherein said technology mainly comprises the steps:
1) with Ni and Cr contained raw material molten iron dephosphorization in blast furnace, makes by weight percentage phosphorus content, adds in electric furnace or the inferior oxygen stove and smelt that molten steel per ton adds the slag making of 3-18% unslaked lime below 0.035%;
2) smelting process adding nitrogen/argon gas and oxygen use jointly, and molten steel blowing oxygen quantity wherein per ton is the 0.8-2 cubic meter, argon gas 0.4-1.2 cubic meter, and nitrogen 0.5-1.5 cubic meter goes out molten steel and obtains finished product.
2. the technology of directly smelting stainless steel from dephosphorization blast furnace molten iron in furnace as claimed in claim 1, wherein also add mother liquor of stainless steel in smelting process, go out molten steel through fine setting after the content of main component reaches following standard in the molten steel in electric furnace and obtain finished product, wherein described by weight percentage standard is: chromium 8-18%, nickel 0.8-8.5%, manganese 5.5-14%, copper 1.5-3.2%, carbon is less than 0.15%, silicon is less than 1%, sulphur is less than 0.03%, and phosphorus is less than 0.035%, iron 65-83%.
3. the technology of directly smelting stainless steel from dephosphorization blast furnace molten iron in furnace as claimed in claim 1 or 2, molten steel blowing oxygen quantity wherein per ton is 0.8 cubic metre, 0.5 cubic metre of argon gas, 0.6 cubic metre of nitrogen.
4. the technology of directly smelting stainless steel from dephosphorization blast furnace molten iron in furnace as claimed in claim 1 or 2, wherein said dephosphorization blast furnace molten iron in furnace is by nickel oxide raw ore adding Wingdale or silica dual alkalinity to be adjusted to 0.4-0.7, add Wingdale and breeze again and carry out sintering, obtain the agglomerate of dual alkalinity 0.5-0.8, agglomerate is further gone into blast-furnace smelting obtain the nickel chromium triangle molten iron of phosphorus content below 0.035% by weight percentage.
5. the technology of directly smelting stainless steel from dephosphorization blast furnace molten iron in furnace as claimed in claim 2, the nickel-chromium pig iron mother liquor that the mother liquor of stainless steel that wherein adds in smelting process adopts nickel oxide ore to form through blast-furnace smelting.
6. the technology of directly smelting stainless steel from dephosphorization blast furnace molten iron in furnace as claimed in claim 2, the nickel-chromium pig iron mother liquor that the mother liquor of stainless steel that wherein adds in smelting process adopts nickel oxide ore and stainless steel industry waste to form through blast-furnace smelting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200710003099A CN100577840C (en) | 2007-02-02 | 2007-02-02 | Technique for directly smelting stainless steel from dephosphorization blast furnace molten iron in furnace |
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| CN200710003099A CN100577840C (en) | 2007-02-02 | 2007-02-02 | Technique for directly smelting stainless steel from dephosphorization blast furnace molten iron in furnace |
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| CN101235463A true CN101235463A (en) | 2008-08-06 |
| CN100577840C CN100577840C (en) | 2010-01-06 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009024069A1 (en) * | 2007-08-15 | 2009-02-26 | Baofeng Jin | A Fe ALLOY |
| CN101705332B (en) * | 2008-10-08 | 2011-04-13 | 张家港浦项不锈钢有限公司 | Process for manufacturing stainless steel by using high-phosphorus nickel-chromium pig iron |
| CN102465194A (en) * | 2010-11-13 | 2012-05-23 | 山西太钢不锈钢股份有限公司 | Dephosphorization method of molten iron for stainless steel production |
| CN105219923A (en) * | 2015-09-30 | 2016-01-06 | 福建鼎信实业有限公司 | A kind of RKEF produces the technique of ferronickel, ferrochrome and AOD furnace triplex process smelting stainless steel |
| CN108913839A (en) * | 2018-06-29 | 2018-11-30 | 首钢京唐钢铁联合有限责任公司 | A kind of dephosphorization furnace smelting process of hot metal containing low silicon |
-
2007
- 2007-02-02 CN CN200710003099A patent/CN100577840C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009024069A1 (en) * | 2007-08-15 | 2009-02-26 | Baofeng Jin | A Fe ALLOY |
| CN101705332B (en) * | 2008-10-08 | 2011-04-13 | 张家港浦项不锈钢有限公司 | Process for manufacturing stainless steel by using high-phosphorus nickel-chromium pig iron |
| CN102465194A (en) * | 2010-11-13 | 2012-05-23 | 山西太钢不锈钢股份有限公司 | Dephosphorization method of molten iron for stainless steel production |
| CN102465194B (en) * | 2010-11-13 | 2013-04-03 | 山西太钢不锈钢股份有限公司 | Dephosphorization method of molten iron for stainless steel production |
| CN105219923A (en) * | 2015-09-30 | 2016-01-06 | 福建鼎信实业有限公司 | A kind of RKEF produces the technique of ferronickel, ferrochrome and AOD furnace triplex process smelting stainless steel |
| CN108913839A (en) * | 2018-06-29 | 2018-11-30 | 首钢京唐钢铁联合有限责任公司 | A kind of dephosphorization furnace smelting process of hot metal containing low silicon |
| CN108913839B (en) * | 2018-06-29 | 2020-11-06 | 首钢京唐钢铁联合有限责任公司 | Method for smelting low-silicon molten iron by using dephosphorization furnace |
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| CN100577840C (en) | 2010-01-06 |
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