CN101148734A - Smelting method for ferrite stainless steel mother liquid - Google Patents
Smelting method for ferrite stainless steel mother liquid Download PDFInfo
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- CN101148734A CN101148734A CNA2006101163942A CN200610116394A CN101148734A CN 101148734 A CN101148734 A CN 101148734A CN A2006101163942 A CNA2006101163942 A CN A2006101163942A CN 200610116394 A CN200610116394 A CN 200610116394A CN 101148734 A CN101148734 A CN 101148734A
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Abstract
The ferritic stainless steel mother liquid smelting process in the charge mixture mode of dephosphorized molten iron+waste carbon steel+ferrochromium includes the following steps: feeding dephosphorized molten iron, waste carbon steel and ferrochromium and powering on; adding ferrosilicon after powering for 2.0-4.0 Mwh; beginning oxygen blast after powering for 5.0-7.0 Mwh; regulating the oxygen flow rat to 2500 Nm3/h and total oxygen amount to 9-10 Nm3/t after power consumption reaches 8.0-12.0 Mwh; adding lime after power consumption reaches 7.0-10.0 Mwh; spraying carbon powder after power consumption reaches 16.0-20.0 Mwh; adding dolomite after power consumption reaches 15.0-18.0 Mwh; reducing after power consumption reaches 220-240 Kwh/t and the measured temperature reaches 1610 deg.c; and tapping after power consumption reaches 250-320 Kwh/t and the measured temperature reaches 1630-1660 deg.c. The present invention has low power consumption and other advantages.
Description
Technical field
The present invention relates to a kind of smelting process of ferrite stainless steel mother liquid, belong to the electrosmelting stainless steel art.
Background technology
In the prior art, having a kind of is to adopt the dephosphorization molten iron to come smelting stainless steel, and this technology is mainly produced austenitic stainless steel, and its smelting technology is for adding steel scrap earlier after energising for some time, and dephosphorization melted iron continues the energising smelting again; Batching adds alloy for stainless steel steel scrap dephosphorization melted iron.
Chinese patent publication number CN 1796586A discloses a kind of technique for smelting mother liquor of stainless steel from electric furnace, and the batching pattern of this patent application is: dephosphorization molten iron+stainless steel steel scrap+wipla;
Smelting technology: add earlier steel scrap be energized to steel scrap melt substantially clear after dephosphorization melted iron again, continue energising and smelt; The smelting steel grade is an austenitic stainless steel.
Its concrete step of smelting is as follows:
Batching: the stainless steel steel scrap, account for 15～25% of metal add-on, ferrochrome accounts for 15～25% of metal add-on, lime adding amount 30～45kg/t; Dephosphorization molten iron, additional proportion are 35～60%;
Melting adds steel scrap and is energized to 16Mwh, dephosphorization melted iron;
Blowing oxygen quantity control: 5～10m3/t, oxygen blast flow: 1500～2500Nm3/h;
Reduction, ferrosilicon powder spray into 2.5～3.5kg/t, carbon dust sprays into 1.5～2.5kg/t or adds ferrosilicon 2.5～3.5kg/t;
Tapping, terminal point Composition Control (wt%): C:2.50～3.50%; Si :≤0.20%; P:0.030%, Cr:16.00～19.00%; Ni:5.00～6.50%.
Above-mentioned technique for smelting mother liquor of stainless steel from electric furnace deficiency is:
Need a large amount of stainless steel steel scraps, and stainless steel steel scrap inclusion content height exerts an influence to the molten steel quality easily, stainless steel steel scrap cost is higher in addition;
In addition, add earlier steel scrap be energized to steel scrap melt substantially clear after dephosphorization melted iron again, this process slag forms late, the power consumption height.
Summary of the invention
The object of the present invention is to provide a kind of smelting process of ferrite stainless steel mother liquid, can improve electric furnace electric energy and oxygen utilization rate by this method, reduce energy consumption of electric furnace and shorten conduction time, in addition, avoid using the stainless steel steel scrap, reduce electrosmelting ferritic stainless steel cost and improve the molten steel quality simultaneously.
For reaching above-mentioned purpose, the invention provides a kind of smelting process of ferrite stainless steel mother liquid, comprise the following steps:
(1) add carbon steel steel scrap and ferrochrome immediately behind the adding dephosphorization molten iron, and energising;
(2) power consumption is 2.0～4.0Mwh, adds ferrosilicon, and add-on (calculating by the raw material add-on) is 8.5～10kg/t;
(3) power consumption is that 5.0～7.0Mwh begins oxygen blast, oxygen blast flow 1500Nm3/h;
When power consumption reached 8.0～12.0Mwh, the oxygen blast flow was adjusted into 2500 Nm3/h, and total blowing oxygen quantity is 9～10Nm3/t (pressing the raw material add-on calculates);
When (4) power consumption is 7.0～10.0Mwh, add lime (the same prior art of add-on);
When (5) power consumption is 16.0～20.0Mwh, winding-up carbon dust (the same prior art of add-on);
When (6) power consumption is 15.0-18.0Mwh, add rhombspar (the same prior art of add-on);
When (7) being energized to 220-240Kwh/t (press raw material add-on calculate), thermometric during temperature 〉=1610 ℃, begins reduction;
When (8) being energized to 250-320Kwh/t, thermometric, tapping when temperature reaches 1630～1660 ℃.
Wherein, the dephosphorization molten iron that adds in the step (1) accounts for the weight percent (wt%) of mother liquor of stainless steel and is: 50～65.
The weight percent (wt%) that the carbon steel steel scrap that adds in the step (1) accounts for mother liquor of stainless steel is: 15～35.
The weight percent (wt%) that the ferrochrome that adds in the step (1) accounts for mother liquor of stainless steel is: 10～25.
The weight percent that the carbon content of this ferrite stainless steel mother liquid when tapping accounts for mother liquor of stainless steel is: 2～4; The weight percent that the chromium content of this ferrite stainless steel mother liquid when tapping accounts for mother liquor of stainless steel is: 6～16.
Compare with prior art, the invention has the advantages that: improve electric furnace electric energy and oxygen utilization rate, reduce energy consumption of electric furnace, shorten conduction time, improve the electric furnace operating rate; Avoid using the stainless steel steel scrap, reduce stainless steel steel scrap resource anxiety to producing the influence of restriction, reduce foreign matter content in the molten steel after the carbon steel steel scrap that the present invention adopts has reduced electrosmelting ferritic stainless steel cost and used the carbon steel steel scrap instead, improved the quality of molten steel.
Embodiment
Specifically introduce the present invention below by embodiment 1～3.
Table 1 is the ferrite stainless steel mother liquid food ingredient table of embodiment 1～3.
Table 1 unit: wt%
| Embodiment | The dephosphorization molten iron | The carbon steel steel scrap | FeCr |
| 1 | 65 | 25 | 10(62％) |
| 2 | 50 | 35 | 15(62％) |
| 3 | 60 | 15 | 15(62％)+10(50％) |
Table 2
| Original technology | Embodiment 1 | Embodiment 2 | Embodiment 3 | |
| Power consumption Kwh/t | 350 | 250 | 290 | 320 |
| Conduction time min | 52 | 39 | 42 | 45 |
Embodiment 1
See Table 1, in material basket, successively add: the carbon steel steel scrap of 25wt%; The FeCr of 10wt% wherein, contains chromium 62%;
Open bell, in electric furnace, add dephosphorization molten iron: 65wt%; After the dephosphorization molten iron adds, add the batching in the above-mentioned material basket immediately, shut bell;
Power consumption is that 2.0Mwh begins to add ferrosilicon according to adding 8.5kg/t silicon;
Power consumption is that 5.0Mwh begins oxygen blast, oxygen blast flow 1500Nm3/h; When power consumption reaches 8.0Mwh, the oxygen blast flow is adjusted into 2500 Nm3/h, and total blowing oxygen quantity is 10Nm3/t;
When power consumption is 7.0Mwh, begin to add 3.0 tons of lime from high hopper;
When power consumption is 16.0Mwh, begin the carbon dust of jetting;
When power consumption is 15.0Mwh, begin to add rhombspar from high hopper;
When being energized to 220Kwh/t (calculating by add-on), thermometric, sampling (slag specimen) when temperature is 1620 ℃, begin reduction, reduce with silicon, add total amount 400kg:200kg ferrosilicon, the 200kg ferrosilicon powder; Necessary nitrogen blowing in the reduction process, nitrogen flushing flow 2500Nm3/h, nitrogen flushing amount 1～3Nm3/t;
By table 2 as seen, when being energized to 250Kwh/t, thermometric, sampling (steel sample), temperature reaches 1660 ℃, can tap, and be 39 minutes used conduction time.
The carbon content of this ferrite stainless steel mother liquid when tapping is 4.0wt%; Chromium content is 6.0wt%.
Embodiment 2
See Table 1, in material basket, successively add: the carbon steel steel scrap of 35wt%; The FeCr of 15wt% wherein contains chromium 62%;
Open bell, in electric furnace, add dephosphorization molten iron: 50wt%; After the dephosphorization molten iron adds, add the batching in the above-mentioned material basket immediately, shut bell;
Power consumption is that 4.0Mwh begins to add ferrosilicon according to adding 10kg/t silicon;
Power consumption is that 7.0Mwh begins oxygen blast, oxygen blast flow 1500Nm3/h; When power consumption reaches 12.0Mwh, the oxygen blast flow is adjusted into 2500 Nm3/h, and notices that oxygen blast angle, the total blowing oxygen quantity of a heat are 9Nm3/t (calculating by add-on);
Power consumption 8.5Mwh begins to add 3.0 tons of lime from high hopper;
During power consumption 20.0Mwh, begin the carbon dust of jetting;
Power consumption 18.0Mwh begins to add rhombspar from high hopper;
When being energized to 230Kwh/t (calculating by add-on), thermometric, sampling (slag specimen) when temperature is 1610 ℃, begin reduction, reduce with silicon, add total amount 400kg:200kg ferrosilicon, the 200kg ferrosilicon powder;
By table 2 as seen, when being energized to 290Kwh/t, thermometric, sampling (steel sample), temperature reaches 1645 ℃, can tap, and be 42 minutes used conduction time.
The carbon content of this ferrite stainless steel mother liquid when tapping is 2.0wt%; Chromium content is 9.0wt%.
Embodiment 3
See Table 1, in material basket, successively add: the carbon steel steel scrap of 15wt%; The FeCr of 15wt% (wherein, containing chromium 62%); The FeCr of 10wt% (wherein, containing chromium 50%);
Open bell, in electric furnace, add dephosphorization molten iron: 59wt%; After the dephosphorization molten iron adds, add the batching in the above-mentioned material basket immediately, shut bell;
Power consumption is that 3.0Mwh begins to add ferrosilicon according to adding 9.5kg/t silicon;
Power consumption is that 6.0Mwh begins oxygen blast, oxygen blast flow 1500Nm3/h; When power consumption reaches 11.0Mwh, the oxygen blast flow is adjusted into 2500Nm3/h, and notes the oxygen blast angle, and the total blowing oxygen quantity of a heat (calculating by add-on) is 9.0Nm3/t;
Power consumption 10.0Mwh begins to add 3.0 tons of lime from high hopper;
During power consumption 18.50Mwh, begin the carbon dust of jetting;
Power consumption 16.0Mwh begins to add rhombspar from high hopper;
When being energized to 240Kwh/t (calculating by add-on), thermometric, sampling (slag specimen) when temperature is 1610 ℃, begin reduction, reduce with silicon, add total amount 400kg:200kg ferrosilicon, the 200kg ferrosilicon powder;
By table 2 as seen, when being energized to 320Kwh/t, thermometric, sampling (steel sample), temperature reaches 1630 ℃, can tap, and be 45 minutes used conduction time.
And can see that from table 2 when the used power consumption of original technology was 350Kwh/t, be 52 minutes used conduction time.
The carbon content of this ferrite stainless steel mother liquid when tapping is 3.2wt%; Chromium content is 16.0wt%.
After adopting the present invention, electric furnace conduction time and power consumption are obviously improved, shorten conduction time, improved the electric furnace operating rate, the reduction explanation electric furnace electric energy and the oxygen utilization rate of power consumption improve, utilization rate of electrical improves makes furnace lining reduced by the arc light radiation, thereby can effectively improve electric furnace furnace life, and electric furnace furnace life is brought up to 280～350 stoves from 120～180 stoves.The present invention can use in similar stainless steel electric furnace.
Claims (6)
1. the smelting process of a ferrite stainless steel mother liquid is characterized in that, comprises the following steps:
(1) add carbon steel steel scrap and ferrochrome immediately behind the adding dephosphorization molten iron, and energising;
When (2) power consumption is 2.0～4.0Mwh, add ferrosilicon, press the raw material add-on and calculate, add-on is 8.5～10kg/t;
Begin oxygen blast when (3) power consumption is 5.0～7.0Mwh, oxygen blast flow 1500Nm3/h;
When power consumption reached 8.0～12.0Mwh, the oxygen blast flow was adjusted into 2500 Nm3/h, and total blowing oxygen quantity is calculated as 9～10Nm3/t by the raw material add-on;
When (4) power consumption is 7.0～10.0Mwh, add lime;
When (5) power consumption is 16.0～20.0Mwh, the winding-up carbon dust;
When (6) power consumption is 15.0～18.0Mwh, add rhombspar;
When (7) energising was calculated to 220-240Kwh/t by the raw material add-on, thermometric during temperature 〉=1610 ℃, began reduction;
When (8) being energized to 250-320Kwh/t, thermometric, tapping when temperature reaches 1630～1660 ℃.
2. the smelting process of ferrite stainless steel mother liquid as claimed in claim 1 is characterized in that: the weight percent that the dephosphorization molten iron that adds in the step (1) accounts for mother liquor of stainless steel is: 50～65.
3. the smelting process of ferrite stainless steel mother liquid as claimed in claim 1 is characterized in that: the weight percent that the carbon steel steel scrap that adds in the step (1) accounts for mother liquor of stainless steel is: 15～35.
4. the smelting process of ferrite stainless steel mother liquid as claimed in claim 1 is characterized in that: the weight percent that the ferrochrome that adds in the step (1) accounts for mother liquor of stainless steel is: 10～25.
5. the smelting process of ferrite stainless steel mother liquid as claimed in claim 1 is characterized in that: the weight percent that the carbon content of this ferrite stainless steel mother liquid when tapping accounts for mother liquor of stainless steel is: 2～4.
6. the smelting process of ferrite stainless steel mother liquid as claimed in claim 1 is characterized in that: the weight percent that the chromium content of this ferrite stainless steel mother liquid when tapping accounts for mother liquor of stainless steel is: 6～16.
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| CNB2006101163942A CN100494442C (en) | 2006-09-21 | 2006-09-21 | Smelting method for ferrite stainless steel mother solution |
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| CNB2006101163942A CN100494442C (en) | 2006-09-21 | 2006-09-21 | Smelting method for ferrite stainless steel mother solution |
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| CN101148734A true CN101148734A (en) | 2008-03-26 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226246A (en) * | 2011-06-16 | 2011-10-26 | 振石集团东方特钢股份有限公司 | Smelting method of stainless steel mother liquor |
| CN102719726A (en) * | 2012-06-26 | 2012-10-10 | 山西太钢不锈钢股份有限公司 | Method for producing stainless steel master liquid |
| CN102766799A (en) * | 2012-08-01 | 2012-11-07 | 山西太钢不锈钢股份有限公司 | Method for smelting stainless steel with high chrome melts and dephosphorized melted iron |
| CN103146981A (en) * | 2013-03-08 | 2013-06-12 | 山西太钢不锈钢股份有限公司 | Method for smelting ferritic stainless steel by dephosphorized molten iron |
| CN104109809A (en) * | 2014-06-20 | 2014-10-22 | 宝钢不锈钢有限公司 | High formability and low-chromium ferrite stainless steel and making method thereof |
| CN105755206A (en) * | 2014-12-17 | 2016-07-13 | 宝钢资源有限公司 | Method for recycling and reuse of low-phosphorus pure scrap steel |
-
2006
- 2006-09-21 CN CNB2006101163942A patent/CN100494442C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226246A (en) * | 2011-06-16 | 2011-10-26 | 振石集团东方特钢股份有限公司 | Smelting method of stainless steel mother liquor |
| CN102226246B (en) * | 2011-06-16 | 2012-10-17 | 振石集团东方特钢股份有限公司 | Smelting method of stainless steel mother liquor |
| CN102719726A (en) * | 2012-06-26 | 2012-10-10 | 山西太钢不锈钢股份有限公司 | Method for producing stainless steel master liquid |
| 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 |
| CN102766799A (en) * | 2012-08-01 | 2012-11-07 | 山西太钢不锈钢股份有限公司 | Method for smelting stainless steel with high chrome melts and dephosphorized melted iron |
| CN103146981A (en) * | 2013-03-08 | 2013-06-12 | 山西太钢不锈钢股份有限公司 | Method for smelting ferritic stainless steel by dephosphorized molten iron |
| CN103146981B (en) * | 2013-03-08 | 2014-12-24 | 山西太钢不锈钢股份有限公司 | Method for smelting ferritic stainless steel by dephosphorized molten iron |
| CN104109809A (en) * | 2014-06-20 | 2014-10-22 | 宝钢不锈钢有限公司 | High formability and low-chromium ferrite stainless steel and making method thereof |
| CN104109809B (en) * | 2014-06-20 | 2018-11-06 | 宝钢不锈钢有限公司 | A kind of high formability low chrome ferritic stainless steel and manufacturing method |
| CN105755206A (en) * | 2014-12-17 | 2016-07-13 | 宝钢资源有限公司 | Method for recycling and reuse of low-phosphorus pure scrap steel |
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| CN100494442C (en) | 2009-06-03 |
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