CN102226246B - Smelting method of stainless steel mother liquor - Google Patents
Smelting method of stainless steel mother liquor Download PDFInfo
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- CN102226246B CN102226246B CN201110162492A CN201110162492A CN102226246B CN 102226246 B CN102226246 B CN 102226246B CN 201110162492 A CN201110162492 A CN 201110162492A CN 201110162492 A CN201110162492 A CN 201110162492A CN 102226246 B CN102226246 B CN 102226246B
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Abstract
The invention relates to a smelting method of stainless steel mother liquor, belonging to the field of metal smelting. The method comprises the following steps: smelting nickel-containing pig iron by consteel electric furnace technology, wherein the tapping temperature is 1550-1600 DEG C; and melting natural block high-carbon ferrochrome in an intermediate frequency furnace, wherein the alloy melting temperature is 1580-1650 DEG C. The nickel-containing pig iron is smelted by consteel electric furnace technology, the natural block high-carbon ferrochrome is melted in the intermediate frequency furnace, and the nickel/chromium-containing mother liquor is added into an AOD (argon oxygen decarburization) furnace to carry out smelting, thereby increasing the yields of nickel and chromium, lowering the material cost and shortening the smelting period.
Description
Technical field
The present invention relates to a kind of smelting process of mother liquor of stainless steel, belong to the Metal smelting field.
Background technology
At present; The method of smelting stainless steel mother liquid under the domestic abbreviated system condition: what large-size stainless steel company mainly adopted is smelting mother liquor of stainless steel from electric furnace; Promptly use furnace melting pyrolic alloy, stainless steel returns, high carbon ferro-chrome and carbon steel steel scrap (or dephosphorization molten iron); Domestic Baosteel stainless steel company, Taiyuan Iron and Steel Co. stainless steel company, Pu, Zhangjiagang Xiang Zhigang company, what all adopt is the method with smelting mother liquor of stainless steel from electric furnace.Small-sized stainless steel company mainly adopts the intermediate frequency furnace smelting stainless steel mother liquid, i.e. intermediate frequency furnace melting stainless steel returns, and there are several companies of the holding subordinate in green hill in domestic typical enterprise, all adopts the method for intermediate frequency furnace smelting stainless steel mother liquid.
When adopting smelting mother liquor of stainless steel from electric furnace, ubiquitous problem is: tap to tap time is long, and melting electric consumption is high, electric-furnace slag Cr
2O
3Content is high, and the yield of Cr is low, and noise is big, and smelting process does not possess the P-condition of taking off, and is very high to the requirement of raw material.And when adopting the intermediate frequency furnace smelting stainless steel mother liquid, the raw material that can select for use is unique, i.e. stainless steel returns, and tap to tap time are long, the melting electric consumption height.
Summary of the invention
Technical problem to be solved by this invention provide a kind of technological design rationally, low power consumption, lower noise, chromium yield be high, use nature piece high carbon ferro-chrome in a large number, take off the smelting process that P smelts the high mother liquor of stainless steel of efficient height and nickel yield.
The present invention solves the problems of the technologies described above the smelting process that the technical scheme that is adopted is this mother liquor of stainless steel, and its process step and parameter are set to:
A, nickel-contained pig iron is joined on the Consteel conveyor, go into the stokehold and carry out preheating, be preheating to 200-300 ℃ at the Consteel preheating section;
After b, last stove have gone out steel, fill in EBT, body of heater shakes the energising of flat back; Start the charging of Consteel conveyor, nickel-contained pig iron gets in the stove with the speed of 1-6m/min, and the molten bath is under the refined states all the time; Start fire door oxygen rifle simultaneously, according to the content of C, Si in charging feedstock weight and the raw material, the adjustment oxygen flow; In the smelting process, the bath temperature remains on 1500 ± 30 ℃ continuously, to control bath temperature through the control input speed;
Electric furnace mother liquor composition when c, tapping is controlled to be: C:1.0% ~ 2.5%; Si:0.1%-0.5%; P :≤0.045%; Cr:＜4%; Ni:7 ~ 12%; Accomplish the smelting of nickel-contained pig iron, obtain temperature and be 1550-1600 ℃ nickel-containing molten iron mother liquor;
D, in electrosmelting; High carbon ferro-chrome is joined in the intermediate frequency furnace, and heat fused is if the final Ni content in Theoretical Calculation AOD reduction back is on the low side in the molten final proof of electric furnace; Intermediate frequency furnace will consider and adds nickel content is 28% ~ 45% superelevation nickel; Adjust, when alloy temperature reaches 1620-1700 ℃, obtain the high carbon ferro-chrome mother liquor;
E, the high carbon ferro-chrome mother liquor of the nickel-containing molten iron mother liquor of Consteel electric furnace and intermediate frequency furnace successively tapped mix in the duckbilled bag, the mother liquor of stainless steel ultimate constituent: C:1.5% ~ 3.0%, Si:0.5% ~ 1.0%, P: 0.045%, Cr:5% ~ 18%, Ni:5% ~ 12%;
F, the final mother liquor in the duckbilled bag is blended into the AOD stove, accomplishes the smelting of mother liquor of stainless steel.
As preferably, among the step b of the present invention, the step of adjustment oxygen flow is: send when establishing the beginning by cable, because bath temperature is high, the molten steel and the quantity of slag are few, and oxygen flow is controlled at 1500m
3/ h, smelt carry out 3-5 minute after, oxygen flow is adjusted to 3600 m3/h, normally smelt, treat that whole furnace charges are gone into stove after, temperature reaches about 1500 ℃, sampling analysis Si constituent content carries out oxygen flow at 2000-3600 m according to the Si constituent content
3Adjust between/the h, guarantee in Si≤0.5% of electric furnace molten iron mother liquor.
As preferably, among the step e of the present invention, the mother liquor of stainless steel ultimate constituent: C:2.0%, Si:0.8%, P: 0.045%, Cr:10.6%, Ni:9%.
The present invention has the following advantages and characteristics with existing compared with techniques: when adopting technology of the present invention, the raw material of being selected for use is the high carbon ferro-chrome of nickel-contained pig iron and natural piece.In consteel electrosmelting process, the nickel-contained pig iron continuously pre-heating is gone into stove continuously, continuous melting, and the molten bath is under the refined states all the time, has reached low power consumption, lower noise, takes off P, has smelted efficient height and the high effect of nickel yield.Intermediate frequency furnace fusing nature piece high carbon ferro-chrome, the few yield of chromium loss is high, and natural piece high carbon ferro-chrome does not need secondary processing, and purchasing of raw materials cost reduces.The present invention is owing to use the consteel furnace technology to smelt nickel-contained pig iron, and the nickel pig iron is gone into the stokehold by preheating, stays the steel operation; Melting electric consumption is low, average current drain 350kwh/t, omnidistance foamy slag operation; The heat energy utilization rate is high; Electric arc does not directly contact with the nickel pig iron during smelting, and the nickel that flue gas is taken away reduces, and the nickel yield is high; High carbon ferro-chrome melts at intermediate frequency furnace, and smelting cycle is short, smelts efficient and improves. and the present invention has realized nickel chromium triangle partition method smelting stainless steel mother liquid.Adopt furnace technology to smelt nickel-contained pig iron, the molten bath is in refined states always in the smelting process, can control bath temperature through the control input speed, and it is obvious to take off the P effect.Adopt intermediate frequency furnaceization nature piece high carbon ferro-chrome, the chromium loss is few, and yield is high, and the chromium yield is more than 99%, and natural piece ferrochrome does not need secondary processing, and purchasing of raw materials cost reduces.Generally, nickel chromium triangle yield of the present invention is high, smelting cycle is short, melting electric consumption is low, raw materials cost is low, production efficiency is high.
Embodiment
Below in conjunction with embodiment the present invention is done further detailed description, following examples are to explanation of the present invention and the present invention is not limited to following examples.
Embodiment 1:
Prepare Consteel electric furnace raw material: nickeliferous 5% nickel pig iron 3t, 9-15% nickel pig iron 64.555t, the mean P content of the nickel pig iron is 0.052%.
Prepare the intermediate frequency furnace raw material: high carbon ferro-chrome 10.45t, nickeliferous 40% nickel pig iron 1.1t.
Nickel-contained pig iron is joined on the Consteel conveyor, enter the stokehold and be introduced into preheating section and carry out preheating, be preheating to 200-300 ℃;
After last stove has gone out steel, fill in EBT, body of heater shakes the energising of flat back; Start the charging of Consteel conveyor, nickel-contained pig iron gets in the stove with 1-6m/min speed, and the molten bath is under the refined states all the time; Start fire door oxygen rifle simultaneously, according to the content of C, Si in charging feedstock weight and the raw material, the adjustment oxygen flow; In the smelting process, the bath temperature remains on 1500 ± 30 ℃ continuously, to control bath temperature through the control input speed;
Electric furnace mother liquor composition during tapping is controlled to be: C:1.41%, Si:0.3%, P:0.019%, Cr:1.44%, Ni:10.99%.Accomplish the smelting of nickel-contained pig iron, obtain temperature and be 1556 ℃ nickel-containing molten iron mother liquor 61.9t.The smelting cycle 65min of this smelting, power consumption 19600kwh.
In electrosmelting, high carbon ferro-chrome is joined in the intermediate frequency furnace, heat fused is added nickel content and is 40% the nickel pig iron, adjusts, and when alloy temperature reaches 1628 ℃, obtains the high carbon ferro-chrome mother liquor, smelting cycle 64min, tap 11.1t.
The high carbon ferro-chrome mother liquor of the nickel-containing molten iron mother liquor of Consteel electric furnace and intermediate frequency furnace successively tapped mix the mother liquor of stainless steel ultimate constituent: C:2.3%, Si:0.64%, P:0.024%, Cr:9.70%, Ni:9.16% in the duckbilled bag.
Final mother liquor in the duckbilled bag is blended into the AOD stove, accomplishes the smelting of mother liquor of stainless steel.
Embodiment 2:
Prepare Consteel electric furnace raw material: nickeliferous 6% nickel pig iron 3.5t, 10-15% nickel pig iron 60.86t, the mean P content of the nickel pig iron is 0.075%.
Prepare the intermediate frequency furnace raw material: high carbon ferro-chrome 10.2t, nickeliferous 37% nickel pig iron 1.4t.
Nickel-contained pig iron is joined on the Consteel conveyor, go into the stokehold and carry out preheating, be preheating to 200-300 ℃ at the consteel preheating section;
After last stove has gone out steel, fill in EBT, body of heater shakes the energising of flat back; Start the charging of Consteel conveyor, nickel-contained pig iron gets in the stove with 1-6m/min speed, and the molten bath is under the refined states all the time; Start fire door oxygen rifle simultaneously, according to the content of C, Si in charging feedstock weight and the raw material, the adjustment oxygen flow; In the smelting process, the bath temperature remains on 1500 ± 30 ℃ continuously, to control bath temperature through the control input speed;
Electric furnace mother liquor composition during tapping is controlled to be: C:1.48%, Si:0.39%, P:0.023%, Cr:1.07%, Ni:9.99%.Accomplish the smelting of nickel-contained pig iron, obtain temperature and be 1576 ℃ nickel-containing molten iron mother liquor 62.4t.The smelting cycle 50min of this smelting, power consumption 19550kwh.
In electrosmelting, high carbon ferro-chrome is joined in the intermediate frequency furnace, heat fused is added nickel content and is 37% the nickel pig iron, adjusts, and when alloy temperature reaches 1630 ℃, obtains the high carbon ferro-chrome mother liquor, smelting cycle 61min, tap 11.6t.
The high carbon ferro-chrome mother liquor of the nickel-containing molten iron mother liquor of Consteel electric furnace and intermediate frequency furnace successively tapped mix the mother liquor of stainless steel ultimate constituent: C:1.91%, Si:0.45%, P:0.033%, Cr:10.44%, Ni:9.62% in the duckbilled bag.
Final mother liquor in the duckbilled bag is blended into the AOD stove, accomplishes the smelting of mother liquor of stainless steel.
Embodiment 3
Prepare Consteel electric furnace raw material: nickeliferous 6% nickel pig iron 4.2t, 10-15% nickel pig iron 60.5t, the mean P content of the nickel pig iron is 0.074%.
Prepare the intermediate frequency furnace raw material: high carbon ferro-chrome 10t, nickeliferous 37% nickel pig iron 1.2t.
Nickel-contained pig iron is joined on the Consteel conveyor, go into the stokehold and carry out preheating, be preheating to 200-300 ℃ at the consteel preheating section;
After last stove has gone out steel, fill in EBT, body of heater shakes the energising of flat back; Start the charging of Consteel conveyor, nickel-contained pig iron gets in the stove with 1-6m/min speed, and the molten bath is under the refined states all the time; Start fire door oxygen rifle simultaneously, according to the content of C, Si in charging feedstock weight and the raw material, the adjustment oxygen flow; In the smelting process, the bath temperature remains on 1500 ± 30 ℃ continuously, to control bath temperature through the control input speed;
Electric furnace mother liquor composition during tapping is controlled to be: C:1.37%, Si:0.43%, P:0.030%, Cr:1.43%, Ni:10.24%.Accomplish the smelting of nickel-contained pig iron, obtain temperature and be 1563 ℃ nickel-containing molten iron mother liquor 64t.The smelting cycle 52min of this smelting, power consumption 19280kwh.
In electrosmelting, high carbon ferro-chrome is joined in the intermediate frequency furnace, heat fused is added nickel content and is 37% the nickel pig iron, adjusts, and when alloy temperature reaches 1620 ℃, obtains the high carbon ferro-chrome mother liquor, smelting cycle 58min, tap 10.5t.
The high carbon ferro-chrome mother liquor of the nickel-containing molten iron mother liquor of Consteel electric furnace and intermediate frequency furnace successively tapped mix the mother liquor of stainless steel ultimate constituent: C:2.01%, Si:0.56%, P:0.034%, Cr:9.11%, Ni:9.81% in the duckbilled bag.
Final mother liquor in the duckbilled bag is blended into the AOD stove, accomplishes the smelting of mother liquor of stainless steel.
Embodiment 4
Prepare Consteel electric furnace raw material: nickeliferous 5% nickel pig iron 10t, 10-15% nickel pig iron 57.46t, the mean P content of the nickel pig iron is 0.068%.
Prepare the intermediate frequency furnace raw material: high carbon ferro-chrome 11.26t.
Nickel-contained pig iron is joined on the Consteel conveyor, go into the stokehold and carry out preheating, be preheating to 200-300 ℃ at the Consteel preheating section;
After last stove has gone out steel, fill in EBT, body of heater shakes the energising of flat back; Start the charging of Consteel conveyor, nickel-contained pig iron gets in the stove with 1-6m/min speed, and the molten bath is under the refined states all the time; Start fire door oxygen rifle simultaneously, according to the content of C, Si in charging feedstock weight and the raw material, the adjustment oxygen flow; In the smelting process, the bath temperature remains on 1500 ± 30 ℃ continuously, to control bath temperature through the control input speed;
Electric furnace mother liquor composition during tapping is controlled to be: C:1.04%, Si:0.49%, P:0.034%, Cr:1.23%, Ni:9.21%.Accomplish the smelting of nickel-contained pig iron, obtain temperature and be 1558 ℃ nickel-containing molten iron mother liquor 63.4t.The smelting cycle 53min of this smelting, power consumption 17680kwh.
In electrosmelting, high carbon ferro-chrome is joined in the intermediate frequency furnace, heat fused when alloy temperature reaches 1620 ℃, obtains the high carbon ferro-chrome mother liquor, smelting cycle 60min, tap 11.3t.
The high carbon ferro-chrome mother liquor of the nickel-containing molten iron mother liquor of Consteel electric furnace and intermediate frequency furnace successively tapped mix the mother liquor of stainless steel ultimate constituent: C:1.76%, Si:0.36%, P:0.035%, Cr:9.90%, Ni:8.24% in the duckbilled bag.
Final mother liquor in the duckbilled bag is blended into the AOD stove, accomplishes the smelting of mother liquor of stainless steel.
In addition, need to prove, the specific embodiment described in this specification sheets, its prescription, title that technology is named etc. can be different.Allly conceive equivalence or the simple change that described structure, characteristic and principle are done, include in the protection domain of patent of the present invention according to patent of the present invention.Person of ordinary skill in the field of the present invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment; Only otherwise depart from structure of the present invention or surmount the defined scope of these claims, all should belong to protection scope of the present invention.
Though the present invention with embodiment openly as above; But it is not in order to limit protection scope of the present invention; Any technician who is familiar with this technology, change and the retouching in not breaking away from design of the present invention and scope, done all should belong to protection scope of the present invention.
Claims (3)
1. the smelting process of a mother liquor of stainless steel, its process step and parameter are set to:
A, nickel-contained pig iron is joined on the Consteel conveyor, go into the stokehold and carry out preheating, be preheating to 200-300 ℃ at the Consteel preheating section;
After b, last stove have gone out steel, fill in EBT, body of heater shakes the energising of flat back; Start the charging of Consteel conveyor, nickel-contained pig iron gets in the stove with the speed of 1-6m/min, and the molten bath is under the refined states all the time; Start fire door oxygen rifle simultaneously, according to the content of C, Si in charging feedstock weight and the raw material, the adjustment oxygen flow; In the smelting process, bath temperature remains on 1500 ± 30 ℃ continuously, controls bath temperature through the control input speed;
Electric furnace mother liquor composition when c, tapping is controlled to be: C:1.0% ~ 2.5%; Si:0.1%-0.5%; P :≤0.045%; Cr:＜4%; Ni:7 ~ 12%; Accomplish the smelting of nickel-contained pig iron, obtain temperature and be 1550-1600 ℃ nickel-containing molten iron mother liquor;
D, in electrosmelting; High carbon ferro-chrome is joined in the intermediate frequency furnace, and heat fused is if the final Ni content in Theoretical Calculation AOD reduction back is on the low side in the molten final proof of electric furnace; It is 28% ~ 45% superelevation nickel that intermediate frequency furnace is added nickel content; Adjust, when alloy temperature reaches 1620-1700 ℃, obtain the high carbon ferro-chrome mother liquor;
E, the high carbon ferro-chrome mother liquor of the nickel-containing molten iron mother liquor of Consteel electric furnace and intermediate frequency furnace successively tapped mix in the duckbilled bag, the mother liquor of stainless steel ultimate constituent: C:1.5% ~ 3.0%, Si:0.5% ~ 1.0%, P: 0.045%, Cr:5% ~ 18%, Ni:5% ~ 12%;
F, the final mother liquor in the duckbilled bag is blended into the AOD stove, accomplishes the smelting of mother liquor of stainless steel.
2. the smelting process of mother liquor of stainless steel according to claim 1 is characterized in that: among the described step b, the step of adjustment oxygen flow is: send when establishing the beginning by cable, because bath temperature is high, the molten steel and the quantity of slag are few, and oxygen flow is controlled at 1500m
3/ h after smelting is carried out 3-5 minute, adjusts to 3600 m with oxygen flow
3/ h normally smelts, treat that whole furnace charges are gone into stove after, temperature reaches 1500 ℃, sampling analysis Si constituent content carries out oxygen flow at 2000-3600 m according to the Si constituent content
3Adjust between/the h, guarantee in Si≤0.5% of electric furnace molten iron mother liquor.
3. the smelting process of mother liquor of stainless steel according to claim 1 is characterized in that: among the described step e, and the mother liquor of stainless steel ultimate constituent: C:2.0%, Si:0.8%, P: 0.045%, Cr:10.6%, Ni:9%.
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Families Citing this family (8)
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| CN102719726B (en) * | 2012-06-26 | 2013-09-25 | 山西太钢不锈钢股份有限公司 | Method for producing stainless steel master liquid |
| CN102766726A (en) * | 2012-08-02 | 2012-11-07 | 山西太钢不锈钢股份有限公司 | Method for smelting stainless steel by high-chrome melt and dephosphorized pre-melt |
| CN103667600A (en) * | 2012-09-24 | 2014-03-26 | 江苏鑫悦汽车零部件有限公司 | Smelting method of martensite steel for air valve of internal combustion engine |
| CN103014559B (en) * | 2012-12-26 | 2015-04-29 | 振石集团东方特钢股份有限公司 | Nickel-saving type double-phase stainless steel and preparation process thereof |
| CN105420621A (en) * | 2015-12-25 | 2016-03-23 | 振石集团东方特钢有限公司 | Austenitic stainless steel used for anti-high-temperature furnace pipe and manufacturing process for plate blank thereof |
| CN107034337B (en) * | 2017-04-07 | 2019-11-01 | 福建吴航不锈钢制品有限公司 | A kind of dephosphorization method for smelting S22053 two phase stainless steel |
| CN107287488A (en) * | 2017-05-26 | 2017-10-24 | 响水恒生不锈钢铸造有限公司 | A kind of inexpensive stainless steel smelting method |
| CN113528928A (en) * | 2021-07-15 | 2021-10-22 | 山西太钢不锈钢股份有限公司 | Iron-nickel base alloy continuous casting billet for precision strip steel and production method thereof |
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| CN101148734A (en) * | 2006-09-21 | 2008-03-26 | 宝山钢铁股份有限公司 | Smelting method for ferrite stainless steel mother liquid |
| CN101914715A (en) * | 2010-08-31 | 2010-12-15 | 振石集团东方特钢股份有限公司 | Method for smelting stainless steel mother liquor |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1796586A (en) * | 2004-12-27 | 2006-07-05 | 宝钢集团上海第一钢铁有限公司 | Technique for smelting mother liquor of stainless steel from electric furnace |
| CN101148734A (en) * | 2006-09-21 | 2008-03-26 | 宝山钢铁股份有限公司 | Smelting method for ferrite stainless steel mother liquid |
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