CN102465239B - Method for increasing sulfur yield of high sulfur stainless steel - Google Patents
Method for increasing sulfur yield of high sulfur stainless steel Download PDFInfo
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- CN102465239B CN102465239B CN 201010545473 CN201010545473A CN102465239B CN 102465239 B CN102465239 B CN 102465239B CN 201010545473 CN201010545473 CN 201010545473 CN 201010545473 A CN201010545473 A CN 201010545473A CN 102465239 B CN102465239 B CN 102465239B
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Abstract
The invention relates to a method for increasing the sulfur yield of high sulfur stainless steel, comprising the following steps: after reducing molten steel in a VOD finery, controlling the alkalinity in residues to 1.4-1.8; adding ferrous sulfide in a LF furnace in batches for resulfurization, wherein, the ferrous sulfide addition of each batch accounts for 30-50 % of the total addition of ferrous sulfide; before adding each batch of ferrous sulfide, heating the temperature of the molten steel up to 1550-1570 DEG C, after adding each batch of ferrous sulfide, blowing argon into the steel ladle and stirring for 3-6 min, wherein, the argon intensity is 5-10 L/min.t; before casting the out-station molten steel, blowing argon into the steel ladle and stirring for 5-10 min, wherein, the argon intensity is 1.25-3.25 L/min.t. According to the method, the sulfur yield is increased to more than 65 % from less than 40% at present, and the deviation between the sulfur content in the out-station molten steel in the LF furnace and the sulfur content of a finished product is kept within 0.005 %.
Description
Technical field
The present invention relates to a kind of method that improves high sulfur content stainless steel sulphur recovery rate, namely improve the method for sulphur recovery rate when smelting carbon content less than 0.08% high sulfur content stainless steel.
Background technology
Most of mechanical structured member steel are wanted machining, for improving the cutting ability of steel, improve the surface smoothness of cutting speed and cutter life and workpiece, need to add a certain amount of element sulphur in steel, increase sulphur content in steel, form free cutting stainless steel.
In existing raising stainless steel, the method for sulphur content is: before electric furnace steel tapping, first sulphur iron is added in bag casting after VOD refining furnace and the processing of LF stove.This method sulphur recovery rate is on the low side, and lower than 40%, and sulphur content is unstable, and in LF stove departures molten steel, sulphur content and finished product sulphur content deviation are larger, and fluctuation is at 0.020-0.060%, and is very large on the steel impact like this.
Summary of the invention
For solving the on the low side and unsettled problem of content of existing high sulfur content stainless steel sulphur recovery rate, the invention provides a kind of method that improves high sulfur content stainless steel sulphur recovery rate, the sulphur recovery rate is brought up to more than 65% less than 40% by existing, made that in LF stove departures molten steel, sulphur content and finished product sulphur content deviation are stabilized in 0.005%.
Design of the present invention is: molten steel after VOD refining furnace reduction, with basicity in slag, i.e. CaO and SiO
2Ratio, be controlled at 1.4-1.8; Add sulphur iron at the LF stove in batches and increase sulphur, every batch of add-on is the 30-50% of the total add-on of sulphur iron; First molten steel temperature is risen to 1550-1570 ℃ at every batch before adding sulphur iron, after every batch of sulphur iron adds, the steel ladle bottom argon blowing gas agitating, argon gas intensity 5-10L/min.t stirs 3-6min; Before molten steel departures casting, the ladle bottom blowing argon gas is weak to be stirred, and argon gas intensity 1.25-3.25L/min.t stirs 5-10min.
The method of this raising high sulfur content stainless steel sulphur recovery rate comprises following step successively:
The I molten steel is at VOD refining furnace oxygen decarburization
Molten steel before VOD refining furnace oxygen decarburization the chemical composition mass percent and slag is thick is:
C 0.15-0.30； Si≤0.15； Mn 1.00-3.00； P≤0.045；
S≥0.010； Cr 17.00-19.00； Ni 8.00-10.00； Cu 1.5-3.00；
N 0.02-0.20; All the other are Fe and inevitable impurity.
Slag is thick≤50mm.
II controls basicity in slag when the VOD refining furnace reduces
When molten steel reduces at the VOD refining furnace, according to SiO in slag
2Content, by adjusting lime adding amount, with basicity in slag, i.e. CaO and SiO
2Ratio, be controlled at 1.4-1.8.
Molten steel chemical composition mass percent after the processing of VOD refining furnace finishes is:
0.03≤C＜0.08； Si 0.10-1.00； Mn 1.00-3.00； P≤0.045；
S≥0.005； Cr 17.00-19.00； Ni 8.00-10.00； Cu 1.5-3.00；
N 0.02-0.06; All the other are Fe and inevitable impurity.
III adds sulphur iron at the LF stove in batches and increases sulphur, and controls ladle bottom blowing air supply intensity and time
Molten steel is processed (operation that processing refers to comprise basicity and molten steel component etc. in oxygen decarburization, carbon deoxidation boiling, reduction, adjustment slag) end at the VOD refining furnace after, add sulphur iron at the LF stove in batches and increase sulphur, every batch of add-on is the 30-50% of the total add-on of sulphur iron; Every batch of sulphur iron first rises to molten steel temperature 1550-1570 ℃ before adding, after every batch of sulphur iron adds, and the steel ladle bottom argon blowing gas agitating, argon gas intensity 5-10L/min.t stirs 3-6min; Before molten steel departures casting, the ladle bottom blowing argon gas is weak to be stirred, and argon gas intensity 1.25-3.25L/min.t stirs 5-10min.
The mass percent of LF stove departures molten steel component:
0.03≤C＜0.08； Si 0.10-1.00； Mn 1.00-3.00； P≤0.045；
S 0.200-0.350； Cr 17.00-19.00； Ni 8.00-10.00；
Cu 1.5-3.00; N 0.02-0.06; All the other are Fe and inevitable impurity.
The VOD refining furnace is identical with the method for existing tf with other working method of LF stove.
In the present invention, the mass percent of sulphur ferrous components for reference is:
C 0.01-0.05； Si 0.05-3.00； Mn 0.05-0.50； P≤0.045；
S 25-50; All the other are Fe and inevitable impurity.
The method of this raising high sulfur content stainless steel sulphur recovery rate, when smelting carbon less than 0.08% high sulfur content stainless steel, by controlling molten steel basicity in the rear slag of VOD refining furnace reduction, add sulphur iron at the LF stove in batches and increase sulphur, ladle bottom blowing air supply intensity and time thereof when rationally controlling agitation of molten steel, the sulphur recovery rate is brought up to more than 65% less than 40% by existing, and sulphur content and finished product sulphur content deviation in LF stove departures molten steel are stabilized in 0.005% by the 0.020-0.060% of current methods.
Embodiment
Describe the embodiment of the method for this raising high sulfur content stainless steel sulphur recovery rate in detail below in conjunction with embodiment, but the specific embodiment of the present invention is not limited to following embodiment.
Embodiment
The present embodiment carries out on 90 tons of VOD refining furnaces and LF stove, and 83.3 tons of molten steel, ladle bottom used are equipped with 2 bottom blow supplying settings, and single bottom blowing gas flow is 600L/min to the maximum, and the VOD maximum vacuum is 50Pa.
It is T303CS3 that the present embodiment is smelted steel grade, and the mass percent of finished product composition is:
C 0.04-0.06； Si 0.10-0.50； Mn 2.40-2.80； P≤0.035；
S 0.200-0.300； Cr 17.00-18.00； Ni 8.00-9.00；
Cu 2.00-3.00; N 0.02-0.06; All the other are Fe and inevitable impurity.
The I molten steel is at VOD refining furnace oxygen decarburization
At the VOD refining furnace, 1620 ℃ of the molten steel temperatures of arriving at a station, the ladle space 1300mm distance of edge to the ladle (the slag liquid level), before the thick 40mm of slag, oxygen decarburization, the mass percent of molten steel component is:
C 0.26； Si 0.12； Mn 2.58； P 0.025； S 0.013； Cr 17.48；
Ni 8.42; Cu 2.35; N 0.1649; All the other are Fe and inevitable impurity.
Oxygen blast 398m under vacuum tightness 200-60mbar condition
3, afterwards at vacuum tightness 1.2mbar, boiling decarburization 11min.
II controls basicity in slag when the VOD refining furnace reduces
During reduction, add lime 0.8t, after fluorite 0.22t, ferrosilicon 0.32t (Si content 75%), slag charge add, under vacuum tightness 2mbar condition, ladle two argon bottom-blowing flows are respectively 556L/min and 583L/min strong mixing 13min.After reduction, 1576 ℃ of molten steel temperatures, basicity in slag, i.e. CaO and SiO
2Ratio be 1.53.After processing finished, the mass percent of molten steel component was:
C 0.042; Si 0.11; Mn 2.50; P 0.025; S 0.013; Cr 17.50; Ni 8.38; Cu2.35; N 0.0295; All the other are Fe and inevitable impurity.
III adds sulphur iron at the LF stove in batches and increases sulphur, and controls ladle bottom blowing air supply intensity and time
At the LF stove, molten steel temperature is risen to 1561 ℃, the 1st batch adds sulphur iron 323Kg, adds rear ladle two argon bottom-blowing flows to be respectively 260L/min and 230L/min stirring 5min; Power transmission 6min afterwards, 1569 ℃ of molten steel temperatures add the 2nd crowd of sulphur iron 323Kg, add rear ladle two argon bottom-blowing flows to be respectively 266L/min and 220L/min stirs 3min; Before the molten steel departures, ladle two argon bottom-blowing flows are respectively 80L/min and the weak 5min of stirring of 83L/min.During departures, the mass percent of molten steel component is: C 0.043; Si 0.11; Mn 2.43; P 0.024; S 0.271; Cr 17.42; Ni 8.37; Cu 2.35; N 0.0293; All the other are Fe and inevitable impurity.
VOD refining furnace and other working method of LF stove and existing method are identical.Before casting, molten steel temperature is 1546 ℃, sulphur recovery rate 71%.After the molten steel casting, the mass percent of finished product composition is:
C 0.046; Si 0.13; Mn 2.42; P 0.024; S 0.273; Cr 17.41; Ni 8.36; Cu 2.33; N 0.0290; All the other are Fe and inevitable impurity.
The mass percent of the sulphur ferrous components of the present embodiment is:
C 0.03; Si 2.61; Mn 0.06; P 0.030; S 47.25; All the other are Fe and inevitable impurity.
Claims (1)
1. method that improves high sulfur content stainless steel sulphur recovery rate is characterized in that it comprises following step successively:
IMolten steel is at VOD refining furnace oxygen decarburization
Molten steel before VOD refining furnace oxygen decarburization the chemical composition mass percent and slag is thick is:
C 0.15-0.30； Si≤0.15； Mn 1.00-3.00； P≤0.045；
S≥0.010； Cr 17.00-19.00； Ni 8.00-10.00； Cu 1.5-3.00；
N 0.02-0.20; All the other are Fe and inevitable impurity; Slag is thick≤50mm;
IIWhen reducing, the VOD refining furnace controls basicity in slag
When molten steel reduces at the VOD refining furnace, according to SiO in slag
2Content by adjusting lime adding amount, with basicity in slag, is controlled at 1.4-1.8;
Molten steel chemical composition mass percent after the processing of VOD refining furnace finishes is:
0.03≤C＜0.08； Si 0.10-1.00； Mn 1.00-3.00； P≤0.045；
S≥0.005； Cr 17.00-19.00； Ni 8.00-10.00； Cu 1.5-3.00；
N 0.02-0.06; All the other are Fe and inevitable impurity;
IIIAdd sulphur iron at the LF stove in batches and increase sulphur, and control ladle bottom blowing air supply intensity and time
Molten steel adds sulphur iron at the LF stove in batches and increases sulphur after the processing of VOD refining furnace finishes, and every batch of add-on is the 30-50% of the total add-on of sulphur iron; Every batch of sulphur iron first rises to molten steel temperature 1550-1570 ℃ before adding; After every batch of sulphur iron adds, the steel ladle bottom argon blowing gas agitating, argon gas intensity 5-10L/min.t stirs 3-6min; Before molten steel departures casting, the ladle bottom blowing argon gas is weak to be stirred, and argon gas intensity 1.25-3.25L/min.t stirs 5-10min;
The mass percent of LF stove departures molten steel component:
0.03≤C＜0.08； Si 0.10-1.00； Mn 1.00-3.00； P≤0.045；
S 0.200-0.350； Cr 17.00-19.00； Ni 8.00-10.00；
Cu 1.5-3.00; N 0.02-0.06; All the other are Fe and inevitable impurity.
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| CN 201010545473 CN102465239B (en) | 2010-11-13 | 2010-11-13 | Method for increasing sulfur yield of high sulfur stainless steel |
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| CN102465239B true CN102465239B (en) | 2013-06-12 |
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| CN104232842A (en) * | 2014-09-01 | 2014-12-24 | 浙江青山钢铁有限公司 | Method of increasing sulfur hit rate of sulfur-containing free-cutting stainless steel prepared by argon-oxygen decarburization process |
| CN106834594B (en) * | 2017-01-17 | 2018-08-14 | 唐山市德龙钢铁有限公司 | A kind of method that sulfur bearing steel increases sulphur |
| CN106702075B (en) * | 2017-01-17 | 2018-08-10 | 唐山市德龙钢铁有限公司 | A kind of method that welding wire steel increases sulphur |
| CN109402328B (en) * | 2018-10-24 | 2020-11-13 | 共享铸钢有限公司 | Method for controlling carbon element content of duplex stainless steel smelted by refining furnace |
| CN115961210A (en) * | 2022-12-29 | 2023-04-14 | 烟台华新不锈钢有限公司 | Production process of novel free-cutting austenitic stainless steel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1664122A (en) * | 2005-03-04 | 2005-09-07 | 宝钢集团上海五钢有限公司 | Method for producing low-carbon high-sulfur (sulfur-phosphorous) easy-to-cut structural steel continuous casting billet |
| CN101649372A (en) * | 2009-09-10 | 2010-02-17 | 山西太钢不锈钢股份有限公司 | Method for controlling sulfur content in stainless nickel steel liquid in refining furnace |
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- 2010-11-13 CN CN 201010545473 patent/CN102465239B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1664122A (en) * | 2005-03-04 | 2005-09-07 | 宝钢集团上海五钢有限公司 | Method for producing low-carbon high-sulfur (sulfur-phosphorous) easy-to-cut structural steel continuous casting billet |
| CN101649372A (en) * | 2009-09-10 | 2010-02-17 | 山西太钢不锈钢股份有限公司 | Method for controlling sulfur content in stainless nickel steel liquid in refining furnace |
Non-Patent Citations (2)
| Title |
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| 易切削钢中硫收得率的影响因素;蒋光辉等;《钢铁钒钛》;20070228;第28卷(第1期);第53-55,72页 * |
| 蒋光辉等.易切削钢中硫收得率的影响因素.《钢铁钒钛》.2007,第28卷(第1期),第53-55,72页. |
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