CN108559818A - A kind of inclusion control method of flat cold-rolled sheet super clean austenitic stainless steel - Google Patents
A kind of inclusion control method of flat cold-rolled sheet super clean austenitic stainless steel Download PDFInfo
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- CN108559818A CN108559818A CN201810414660.2A CN201810414660A CN108559818A CN 108559818 A CN108559818 A CN 108559818A CN 201810414660 A CN201810414660 A CN 201810414660A CN 108559818 A CN108559818 A CN 108559818A
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- stainless steel
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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Abstract
The invention discloses a kind of flat cold-rolled sheet inclusion control method of super clean austenitic stainless steel, which includes the following steps：I, to mother liquor of stainless steel row decarburization blowing, reduction by ferrosilicon and pre-deoxidation, then adjusts basicity of slag to 1.8 or more in AOD furnace；Ladle slag is carried out to take off Slag treatment after II, tappings；III .LF stoves carry out refining treatment；IV, continuous castings are cast into continuous casting billet；V, continuous casting billets are using the stainless steel plate obtained after hot rolling, cold rolling.The present invention uses aluminium deep deoxidation, total oxygen content to be less than 20ppm；Since the amount of inclusions is few, stainless steel resisting salt fog corrosion ability obtained is strong；It is mainly tiny magnesium aluminate spinel according to stainless steel inclusion type produced by the present invention, will not extends in the operation of rolling, defect will not be formed on cold plate surface.
Description
Technical field
The present invention relates to the deoxidation of super clean stainless steel and Control and Inclusion Removal techniques, and in particular to a kind of flat cold-rolled sheet use is super
The inclusion control method of pure austenitic stainless steel belongs to stainless steel refining technical field,.
Background technology
Since stainless steel has the characteristics that anti-corrosion, beautiful, easy processing, it is just being widely applied to ornament materials, brand at present
The manufacturing fields such as mark, electronic product casing.With the development of the times, these fields are more next to stainless-steel cold-rolling thin plate demand
It is bigger, it is desirable that also more and more harsh.For example, certain special industries require stainless steel being rolled into 0.5mm cold thin plates below not
Only zero defect, and keep good corrosion resistance；In addition, also there is the polishing that certain industry requirement stainless steels reach 8K or more ranks
Performance.And the principal element for wherein influencing stainless steel these performances is exactly steel inclusion.
Current most of austenitic stainless steel smelting processes use Si deoxidations, and one side total oxygen content is relatively high, is mingled with
Object quantity is more, and since field trash is often the risk factor of stainless steel spot corrosion defect, the amount of inclusions easily causes cold more
The salt air corrosion detection of plate is unqualified.On the other hand, field trash type is mainly that ca aluminosilicate is mingled with, the initial ruler of casting blank foreign matter
Very little larger, full-size reaches 20 μm or more, and easily deformable, becomes large scale B classes or C classes folder after being rolled into cold thin plate
It is miscellaneous, show to form defect in Thin Stainless Steel belt surface；In addition, these field trashes are also the important sources of stainless steel polishing defect.
Therefore, the degree of purity of stainless steel cannot be satisfied the requirement in these fields under common process.
Chinese Patent Application No. 201210507674.1 and 200310113018.4 discloses the preparation of high-purity stainless steel
Method, by controlling sulfur removal technology and slagging process, it is therefore prevented that the generation of high-melting-point field trash.But AOD furnace slag under this technique
Basicity is less than 1.8, though field trash is mingled with to be moulding, due to balancing oxygen content height, steel inclusion number under low alkalinity slag system
Amount is more, and field trash nearby is easy to form point corrosion pit, and therefore, stainless steel cold plate corrosion resistance of surface made from this method is poor.
Chinese Patent Application No. 201611119996.3 discloses high-purity flat cold-rolled sheet austenitic stainless steel and its life
Production method reduces the peeling defect caused by field trash, but this method is using silicon deoxidation work by controlling smelting process
Skill.
Chinese Patent Application No. 201110342002.5 discloses a kind of manufacturer of electronic product casing stainless steel strip
Method highlights control aluminium content to reduce field trash, but specific Control and Inclusion Removal technique, Control and Inclusion Removal effect are not done in detail
It states.
Invention content
The present invention is intended to provide a kind of inclusion control method of flat cold-rolled sheet with super clean austenitic stainless steel, this method
Aluminium deep deoxidation, residue adjustment and inclusion modification is added to obtain total oxygen content less than 15ppm, inclusion size by the deoxidation of AOD silicon, LF
Stainless steel casting blank less than 10 μm, and the stainless steel cold plate surface quality and corrosion resistance thus rolled meets thin strip cold and wants
It asks.
This technique uses AOD silicon deoxidation+LF aluminium deep deoxidation methods, and aluminium content is controlled 0.04 ~ 0.08%, and carries out micro- calcium
Processing, field trash are mainly calcium-aluminate package magnesium aluminate spinel, and casting blank foreign matter size is less than 15 μm, and the operation of rolling is not variable
The stainless steel cold plate field trash of shape, 0.8mm thickness is graded below B0.5 D0.5（It indicates to be mingled with containing two kinds of B classes and D classes）；
And the oxygen content of slag system balance is low, is less than 15ppm；The inclusion floating removal time is extended, the amount of inclusions is few.Although magnesium
Aluminate field trash is considered being easier to cause cold plate Sliver defects, and pit is easily formed in polishing process, but only
It is limited to being mingled with more than 10 μm.Since inclusion size is less than 10 μm in stainless steel of the present invention, substantially cold plate is rolled
System or polishing performance do not influence.And since total oxygen content is low, the amount of inclusions is few, and stainless steel product corrosion resistance is better than existing
Technology.
The present invention provides a kind of flat cold-rolled sheet preparation method of super clean austenitic stainless steel, which includes
Following steps：I in AOD furnace to mother liquor of stainless steel row decarburization blowing, reduction by ferrosilicon, then adjust basicity of slag to 1.8 with
On；Ladle slag is carried out to take off Slag treatment after II tapping；III LF stoves carry out aluminium deep deoxidation refining treatment；IV continuous casting is cast into company
Strand；V continuous casting billet after hot rolling, cold rolling using obtaining stainless steel plate.
In the above preparation method, it is preferable that basicity of slag is adjusted in step I to 1.9 ~ 2.2.
In the above preparation method, it is preferable that remaining ladle slag thickness is 100 ~ 150mm after skimming in step II.
In the above method, step III LF stoves carry out aluminium deep deoxidation refining treatment, include the following steps：（a）LF enters the station addition
Al balls, Al powder, lime, fluorite carry out deep deoxidation and residue adjustment processing, and then heating stirring keeps slag composition uniform and molten steel temperature
It is suitable to spend（Because different steel grade temperature controlling ranges are different, to be determined according to specific steel grade, the austenite stainless
Ladle includes 304,316 etc., and temperature control is different）；（b）Feed pure Ca lines 0 ~ 3m/t steel；（c）Carry out ladle bottom blowing Gas Stirring
Promote inclusion floating with calmness.
In III LF stoves of above-mentioned steps carry out aluminium deep deoxidation refining treatment, it is preferable that in step（a）LF, which enters the station, is added Al
Ball, Al powder, lime, fluorite carry out in deep deoxidation and residue adjustment processing, and Al ball additions are 1.0 ~ 1.5kg/t steel, Al powder additions
For 0.5 ~ 1.0kg/t steel, lime adding amount be 2.0 ~ 4.0 kg/t steel, fluorite addition is 0.5 ~ 2.0 kg/t steel.
In III LF stoves of above-mentioned steps carry out aluminium deep deoxidation refining treatment, it is preferable that in step（c）Carry out ladle bottom blowing
In Gas Stirring and calm promotion inclusion floating, ladle bottom blowing Gas Stirring flow is 0.6 ~ 1.5L/min, and Ladle Bottom is blown
Body mixing time is 5 ~ 30min, and the ladle calmness time is 20 ~ 40min.Further, in step（c）Carry out ladle bottom blowing gas
In stirring and calm promotion inclusion floating, the ladle bottom blowing Gas Stirring time is 15 ~ 25min.
CaO content is more than 90% in lime of the present invention（Mass fraction, similarly hereinafter）, CaF in fluorite2Content is more than
80%, Al content >=99% in aluminum shot, Al content ＞ 95% in aluminium powder, 0.22kg/m containing calcium metal in pure calcium line.
Beneficial effects of the present invention：
（1）Common austenitic stainless steel uses silicon deoxidation, total oxygen content higher；The present invention uses aluminium deoxidation, total oxygen content to be less than
20ppm；Since the amount of inclusions is few, stainless steel resisting salt fog corrosion ability obtained is strong；
（2）Field trash type is mainly ca aluminosilicate in common austenitic stainless steel, and extension is easily deformed in the operation of rolling, is easy
Defect is formed in cold thin sheet surface, cannot be satisfied high-grade panel steel requirement；According to being mingled in stainless steel produced by the present invention
Species type is mainly tiny magnesium aluminate spinel, will not be extended in the operation of rolling, will not form defect on cold plate surface.
Specific implementation mode
It is further illustrated the present invention below by embodiment, but is not limited to following embodiment.
Embodiment 1
Steel grade SUS304
To mother liquor of stainless steel row decarburization blowing, reduction in AOD furnace, basicity of slag is then adjusted to 2.0；AOD tapping molten steel amounts
Then 179t take off Slag treatment to 100mm to ladle slag；
LF, which enters the station, is added Al ball 200kg, Al powder 150kg, lime 700kg, fluorite 200kg progress deep deoxidations and residue adjustment processing, so
Heating stirring afterwards makes that slag composition is uniform and molten steel temperature is suitable；Feed pure Ca lines 1m/t steel；With the Ladle Bottom of 160L/min
Argon throughput stirs 20min；Ladle is sent to continuous casting platform after calm 30min and is cast into continuous casting billet.
The present embodiment strand sampling analysis total oxygen content result is 10ppm, 12 μ of strand Metallographic Analysis field trash full-size
m；
Metallographic phase sample is taken on the 0.8mm cold plates that the present embodiment obtains according to GBT 10561-2005 national standards, and is mingled with
Object is graded, and rating result is B0.5 D 0.5.
Embodiment 2
Steel grade SUS304
To mother liquor of stainless steel row decarburization blowing, reduction in AOD furnace, basicity of slag is then adjusted to 2.2；AOD tapping molten steel amounts
Then 181t take off Slag treatment to 120mm to ladle slag；
LF, which enters the station, is added Al ball 260kg, Al powder 100kg, lime 500kg, fluorite 200kg progress deep deoxidations and residue adjustment processing, so
Heating stirring afterwards makes that slag composition is uniform and molten steel temperature is suitable；Feed pure Ca lines 2m/t steel；With the Ladle Bottom of 160L/min
Argon throughput stirs 25min；Ladle is sent to continuous casting platform after calm 30min and is cast into continuous casting billet.
The present embodiment strand sampling analysis total oxygen content result is 8ppm, 10 μ of strand Metallographic Analysis field trash full-size
m；；
Metallographic phase sample is taken on the 0.8mm cold plates that the present embodiment obtains according to GBT 10561-2005 national standards, and is mingled with
Object is graded, and rating result is B0.5 D 0.5.
Comparative example
Steel grade SUS304
To mother liquor of stainless steel row decarburization blowing, reduction in AOD furnace, basicity of slag is then adjusted to 1.8；AOD tapping molten steel amounts
Then 183t take off Slag treatment to 100mm to ladle slag；
LF, which enters the station to heat up to stir, keeps molten steel temperature suitable；15min is stirred with the ladle bottom blowing argon flow amount of 160L/min；It is calm
Ladle is sent to continuous casting platform after 25min and is cast into continuous casting billet.
This comparative example strand sampling analysis total oxygen content result is 28ppm, 32 μ of strand Metallographic Analysis field trash full-size
m；
Metallographic phase sample is taken on the 0.8mm cold plates that this comparative example obtains according to GBT 10561-2005 national standards, and is mingled with
Object is graded, and rating result is B1.0 C 1.5.
In comparative example, silicon deoxidation is carried out mainly by AOD, LF stoves are without adding aluminium deep deoxidation, and LF is also without residue adjustment, bottom blowing
Stirring and calm time are all shorter；After carrying out AOD silicon deoxidations, basicity of slag carries out the embodiment of the present invention in 2.0 or more, LF
Add aluminium deep deoxidation, residue adjustment, stirring and calm time all longer.
Claims (8)
1. a kind of flat cold-rolled sheet inclusion control method of super clean austenitic stainless steel, it is characterised in that including following step
Suddenly：
I in AOD furnace to mother liquor of stainless steel row decarburization blowing, reduction by ferrosilicon, then adjust basicity of slag to 1.8 or more；
Ladle slag is carried out to take off Slag treatment after II tapping；
III LF stoves carry out aluminium deep deoxidation refining treatment；
IV continuous casting is cast into continuous casting billet；
V continuous casting billet after hot rolling, cold rolling using obtaining stainless steel plate.
2. the flat cold-rolled sheet according to claim 1 inclusion control method of super clean austenitic stainless steel, feature
It is：Basicity of slag is adjusted in step I to 1.9 ~ 2.2.
3. the flat cold-rolled sheet according to claim 1 inclusion control method of super clean austenitic stainless steel, feature
It is：Remaining ladle slag thickness is 100 ~ 150mm after skimming in step II.
4. the flat cold-rolled sheet according to claim 1 inclusion control method of super clean austenitic stainless steel, feature
It is：Step III LF stoves carry out aluminium deep deoxidation refining treatment, include the following steps：（a）LF, which enters the station, is added Al balls, Al powder, stone
Ash, fluorite carry out deep deoxidation and residue adjustment processing, and then heating stirring keeps slag composition uniform；（b）Feed pure Ca lines 0 ~ 3m/t steel；
（c）Carry out ladle bottom blowing Gas Stirring and calm promotion inclusion floating.
5. the flat cold-rolled sheet according to claim 4 inclusion control method of super clean austenitic stainless steel, feature
It is：In step（a）LF, which enters the station, to be added in Al balls, Al powder, lime, fluorite progress deep deoxidation and residue adjustment processing, Al ball additions
It is 0.5 ~ 1.0kg/t steel for 1.0 ~ 1.5kg/t steel, Al powder additions, lime adding amount is 2.0 ~ 4.0 kg/t steel, fluorite addition
Amount is 0.5 ~ 2.0 kg/t steel.
6. the flat cold-rolled sheet according to claim 4 or 5 inclusion control method of super clean austenitic stainless steel, special
Sign is：The mass content of CaO is more than 90% in the lime, CaF in fluorite2Content is more than 80%, and Al content in aluminum shot >=
99%, Al content ＞ 95% in aluminium powder, 0.22kg/m containing calcium metal in pure calcium line.
7. the flat cold-rolled sheet according to claim 4 inclusion control method of super clean austenitic stainless steel, feature
It is：In step（c）It carries out in ladle bottom blowing Gas Stirring and calm promotion inclusion floating, ladle bottom blowing Gas Stirring flow
For 0.6 ~ 1.5L/min, the ladle bottom blowing Gas Stirring time is 5 ~ 30min, and the ladle calmness time is 20 ~ 40min.
8. the flat cold-rolled sheet according to claim 7 inclusion control method of super clean austenitic stainless steel, feature
It is：In step（c）It carries out in ladle bottom blowing Gas Stirring and calm promotion inclusion floating, the ladle bottom blowing Gas Stirring time
For 15 ~ 25min.
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| CN201810414660.2A CN108559818A (en) | 2018-05-03 | 2018-05-03 | A kind of inclusion control method of flat cold-rolled sheet super clean austenitic stainless steel |
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| CN201810414660.2A CN108559818A (en) | 2018-05-03 | 2018-05-03 | A kind of inclusion control method of flat cold-rolled sheet super clean austenitic stainless steel |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111876653A (en) * | 2020-07-27 | 2020-11-03 | 四川六合特种金属材料股份有限公司 | Preparation method of pure austenitic stainless steel |
| CN113151636A (en) * | 2021-03-31 | 2021-07-23 | 北京科技大学 | Method for reducing stainless steel pitting corrosion based on inclusion melting point control |
| CN113186445A (en) * | 2021-03-31 | 2021-07-30 | 中北大学 | Method for controlling inclusion content of stainless steel product |
| CN113201625A (en) * | 2021-03-31 | 2021-08-03 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Control method of stainless steel inclusion for flux-cored wire |
| CN114871292A (en) * | 2022-05-17 | 2022-08-09 | 山西太钢不锈钢股份有限公司 | Manufacturing method for eliminating grinding marks on surface of 300 series stainless steel medium plate |
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| CN106756479A (en) * | 2016-12-08 | 2017-05-31 | 广东广青金属科技有限公司 | High cleanliness flat cold-rolled sheet austenitic stainless steel and its production method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111876653A (en) * | 2020-07-27 | 2020-11-03 | 四川六合特种金属材料股份有限公司 | Preparation method of pure austenitic stainless steel |
| CN113151636A (en) * | 2021-03-31 | 2021-07-23 | 北京科技大学 | Method for reducing stainless steel pitting corrosion based on inclusion melting point control |
| CN113186445A (en) * | 2021-03-31 | 2021-07-30 | 中北大学 | Method for controlling inclusion content of stainless steel product |
| CN113201625A (en) * | 2021-03-31 | 2021-08-03 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Control method of stainless steel inclusion for flux-cored wire |
| CN113151636B (en) * | 2021-03-31 | 2023-01-03 | 北京科技大学 | Method for reducing stainless steel pitting corrosion based on inclusion melting point control |
| CN114871292A (en) * | 2022-05-17 | 2022-08-09 | 山西太钢不锈钢股份有限公司 | Manufacturing method for eliminating grinding marks on surface of 300 series stainless steel medium plate |
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Application publication date: 20180921 |