CN102465239A - 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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- CN102465239A CN102465239A CN2010105454731A CN201010545473A CN102465239A CN 102465239 A CN102465239 A CN 102465239A CN 2010105454731 A CN2010105454731 A CN 2010105454731A CN 201010545473 A CN201010545473 A CN 201010545473A CN 102465239 A CN102465239 A CN 102465239A
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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 yield, promptly when smelting carbon content, improve the method for sulphur yield less than 0.08% high sulfur content stainless steel.
Background technology
Most of mechanical structured member steel are wanted cut, for improving the cutting ability of steel, improve the surface smoothness of cutting speed and cutter life and workpiece, need in steel, to add a certain amount of element sulphur, increase sulphur content in the steel, form free cutting stainless steel.
The method of sulphur content is in the existing raising stainless steel: before the electric furnace steel tapping, earlier sulphur iron is added in the bag casting after VOD refining furnace and the processing of LF stove.This method sulphur yield is on the low side, is lower than 40%, and sulphur content is unstable, and sulphur content and finished product sulphur content deviation are bigger in the LF stove departures molten steel, and fluctuation is at 0.020-0.060%, and is very big to the steel influence like this.
Summary of the invention
For solving the on the low side and content problem of unstable of existing high sulfur content stainless steel sulphur yield; The present invention provides a kind of method that improves high sulfur content stainless steel sulphur yield; The sulphur yield is brought up to more than 65% less than 40% by existing, made that sulphur content and finished product sulphur content deviation are stabilized in 0.005% in the LF stove departures molten steel.
Design of the present invention is: molten steel after VOD refining furnace reduction, with basicity in the 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; Add sulphur iron at every batch and earlier molten steel temperature is risen to 1550-1570 ℃ before, after every batch of sulphur iron added, the steel ladle bottom argon blowing gas mixing was mixed, and argon gas intensity 5-10L/min.t stirs 3-6min; Before the 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 yield comprises following sequential steps:
The I molten steel is at VOD refining furnace oxygen decarburization
Molten steel before VOD refining furnace oxygen decarburization the chemical ingredients 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 unavoidable impurities.
Slag is thick≤50mm.
II controls basicity in the slag when the VOD refining furnace reduces
When molten steel reduces at the VOD refining furnace, according to SiO in the slag
2Content, through the adjustment lime adding amount, with basicity in the slag, i.e. CaO and SiO
2Ratio, be controlled at 1.4-1.8.
Molten steel finishes back chemical ingredients mass percent in the processing of VOD refining furnace:
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 unavoidable impurities.
III adds sulphur iron at the LF stove in batches and increases 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 handle (processing is meant the operation that comprises basicity and molten steel component etc. in oxygen decarburization, carbon deoxidation boiling, reduction, the adjustment slag) end at the VOD refining furnace after, and every batch of add-on is the 30-50% of the total add-on of sulphur iron; Every batch of sulphur iron rises to 1550-1570 ℃ with molten steel temperature earlier before adding, after every batch of sulphur iron added, the steel ladle bottom argon blowing gas mixing was mixed, and argon gas intensity 5-10L/min.t stirs 3-6min; Before the 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 unavoidable impurities.
The VOD refining furnace is identical with the method for existing tf with other working method of LF stove.
The mass percent of for reference sulphur iron is among the present invention:
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 unavoidable impurities.
The method of this raising high sulfur content stainless steel sulphur yield; When smelting carbon less than 0.08% high sulfur content stainless steel; Through control molten steel basicity in the slag of VOD refining furnace reduction back, add sulphur iron at the LF stove in batches and increase sulphur, ladle bottom blowing air supply intensity and time thereof when rationally controlling the molten steel stirring; The sulphur yield is brought up to more than 65% less than 40% by existing, and sulphur content and finished product sulphur content deviation in the LF stove departures molten steel are stabilized in 0.005% by the 0.020-0.060% of current methods.
Embodiment
Specify the embodiment of the method for this raising high sulfur content stainless steel sulphur yield below in conjunction with embodiment, but embodiment of the present invention is not limited to following embodiment.
Embodiment
Present embodiment carries out on 90 tons of VOD refining furnaces and LF stove, and 83.3 tons of molten steel, used ladle bottom 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 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 unavoidable impurities.
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, ladle space 1300mm (the slag liquid level is to the distance of ladle upper edge), the mass percent of molten steel component is before the thick 40mm of slag, oxygen decarburization:
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 unavoidable impurities.
Oxygen blast 398m under vacuum tightness 200-60mbar condition
3, afterwards at vacuum tightness 1.2mbar, boiling decarburization 11min.
II controls basicity in the slag when the VOD refining furnace reduces
During reduction, add lime 0.8t, fluorite 0.22t, ferrosilicon 0.32t (Si content 75%), slag charge add the back under vacuum tightness 2mbar condition, and ladle two argon bottom-blowing flows are respectively 556L/min and 583L/min strong mixing 13min.After the reduction, 1576 ℃ of molten steel temperatures, basicity in the 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 unavoidable impurities.
III adds sulphur iron at the LF stove in batches and increases sulphur, and control 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 back ladle two argon bottom-blowing flows and is respectively 260L/min and 230L/min stirring 5min; Send electric 6min afterwards, 1569 ℃ of molten steel temperatures add the 2nd crowd of sulphur iron 323Kg, add back ladle two argon bottom-blowing flows and are respectively 266L/min and 220L/min stirring 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.The mass percent of molten steel component is during departures: 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 unavoidable impurities.
VOD refining furnace and other working method of LF stove and existing method are identical.Molten steel temperature is 1546 ℃ before the casting, sulphur yield 71%.The mass percent of molten steel casting back 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 unavoidable impurities.
The mass percent of the sulphur iron of present embodiment is:
C 0.03; Si 2.61; Mn 0.06; P 0.030; S 47.25; All the other are Fe and unavoidable impurities.
Claims (2)
1. method that improves high sulfur content stainless steel sulphur yield, it be at molten steel after VOD refining furnace reduction, with basicity in the slag, 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; Add sulphur iron at every batch and earlier molten steel temperature is risen to 1550-1570 ℃ before, after every batch of sulphur iron added, the steel ladle bottom argon blowing gas mixing was mixed, and argon gas intensity 5-10L/min.t stirs 3-6min; Before the 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.
2. the method for raising high sulfur content stainless steel sulphur yield according to claim 1 is characterized in that it comprises following sequential steps:
The I molten steel is at VOD refining furnace oxygen decarburization
Molten steel before VOD refining furnace oxygen decarburization the chemical ingredients 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 unavoidable impurities; Slag is thick≤50mm;
II controls basicity in the slag when the VOD refining furnace reduces
When molten steel reduces at the VOD refining furnace, according to SiO in the slag
2Content through the adjustment lime adding amount, with basicity in the slag, is controlled at 1.4-1.8;
Molten steel finishes back chemical ingredients mass percent in the processing of VOD refining furnace:
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 unavoidable impurities;
III adds sulphur iron at the LF stove in batches and increases 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 rises to 1550-1570 ℃ with molten steel temperature earlier before adding;
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 unavoidable impurities.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106702075A (en) * | 2017-01-17 | 2017-05-24 | 唐山市德龙钢铁有限公司 | Method for increasing sulphur content of welding wire steel |
| CN106834594A (en) * | 2017-01-17 | 2017-06-13 | 唐山市德龙钢铁有限公司 | A kind of method that sulfur bearing steel increases sulphur |
| CN109402328A (en) * | 2018-10-24 | 2019-03-01 | 共享铸钢有限公司 | A kind of refining furnace smelting two phase stainless steel carbon element content control method |
| 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 |
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| 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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| 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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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106702075A (en) * | 2017-01-17 | 2017-05-24 | 唐山市德龙钢铁有限公司 | Method for increasing sulphur content of welding wire steel |
| CN106834594A (en) * | 2017-01-17 | 2017-06-13 | 唐山市德龙钢铁有限公司 | A kind of method that sulfur bearing steel increases sulphur |
| 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 |
| CN109402328A (en) * | 2018-10-24 | 2019-03-01 | 共享铸钢有限公司 | A kind of refining furnace smelting two phase stainless steel carbon element content control method |
| 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 |
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