CN105154620B - A kind of smelting process of titanium-containing austenitic stainless steel sheet material - Google Patents
A kind of smelting process of titanium-containing austenitic stainless steel sheet material Download PDFInfo
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- CN105154620B CN105154620B CN201510619738.0A CN201510619738A CN105154620B CN 105154620 B CN105154620 B CN 105154620B CN 201510619738 A CN201510619738 A CN 201510619738A CN 105154620 B CN105154620 B CN 105154620B
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Abstract
The invention belongs to metallurgical technology field; specifically related to titanium-containing austenitic stainless steel prevents plate surface from the method for inclusion defects occur, and the technique is the decarburization of electric furnace smelting AOD furnace, denitrogenation and reduction deoxidation LF stoves deoxidation, Calcium treatment, skim, Ti Alloying and trimming and temperature adjustment is weak blows calm protective casting.The present invention refined by AOD make the reduction of carbon nitrogen to a certain extent, reduce and reach abundant deoxidation, and control the nitrogen pick-up and oxygenation of tapping process.Deoxidization technique is used when LF stoves enter the station, AOD tapping process oxygenation is set effectively to be removed, improve and stabilize recovery rate by the emperor himself, also reduce the generation of titanyl compound in steel, Calcium treatment is taken after deoxidation, it is deoxidation products denaturation floating removal, LF whole operations process will control stirring intensity, prevent molten steel nitrogen pick-up and secondary oxidation, the content of SiO2 in the basicity and slag of slag is controlled simultaneously, increase the weak waste product for blowing time and calmness time, substantially reducing appearance in production, reduce cost and improve product quality.
Description
Technical field
The invention belongs to metallurgical technology field, and in particular to a kind of smelting process of titanium-containing austenitic stainless steel sheet material.
Background technology
The surface inclusion defect that titanium-containing austenitic stainless steel 321 occurs aborning, is the most prominent of each factory of puzzlement
The quality problems for going out, belong to the common problem occurred in process of producing product, each family all in research, but incidence all 5% with
On, some producer's incidences are up to more than 20%, and we have reached 17-40% at producing initial stage incidence, have a strong impact on the matter of product
Amount, scraps because user can not use, and greatly improves production cost, reduces the profitability of product.
The content of the invention
Avoid titanium-containing austenitic stainless steel 321 from occurring surface aborning present invention aim to providing one kind to be mingled with
Thing defect, the reduction of strict control AOD and tapping process, reduce process nitrogen pick-up and oxygenation, it is important that the secondary deoxidation of LF, improves
Titanyl compound in the recovery rate and reduction steel steel of titanium, while to control the Argon of LF, prevents nitrogen pick-up and molten iron secondary oxidation, sternly
Lattice control basicity of slag, temperature and ensure it is weak blow and the calm time, promote inclusion floating to adsorb, reduce stainless steel materials surface
The method for reducing defect.
The present invention is achieved through the following technical solutions：
A kind of smelting process of titanium-containing austenitic stainless steel sheet material, the method is carried out as steps described below：
（1）Electric furnace smelting Composition Control：C:1.6-2.6%, Si:0.16-0.36%, P<0.026%, Ni:9.50-11.00%,
Cr:1600-1650 DEG C of 7.00-10.00%. tapping temperatures；
（2）AOD refines terminal Composition Control：C:0.016-0.026%, Si:0.035-0.045%, P<0.028%, Ni:
9.05-9.30%, Cr:17.05-17.35, N≤0.006%, S≤0.002%, reduction is using aluminium technique, tapping temperature after first silicon
More than 1670 DEG C；
（3）Ladle will shift to an earlier date 10 minutes Argons before AOD tappings, and tapping is fast, while adding pulverized limestone with steel stream, reduces out
Steel process molten steel nitrogen pick-up and oxygen, will carry out taking off Slag treatment after tapping, and ladle band slag thickness is less than 50mm；
（4）LF stoves enter the station 500kg lime to be added, and 200kg fluorites and part refining slag make new slag, while adding AL powder to adjust
Slag, makes the basicity of slag control in 2.0-2.2, while feeding the secondary deoxidation of aluminum steel, inspection makes the Al content in molten steel reach 0.35-
When 0.55%, the oxygen content balanced in steel is 15ppm, feeds silicon-calcium wire treatment；
（5）The Ti content of ferrotianium, molten steel is added to press the control of Ti >=5 (C+N)+0.06% before LF stoves are outbound；
（6）LF stove refining process Argon mixing controls are tried one's best not exposed molten steel, and molten steel carries out power transmission operation, every point to LF stoves
Clock heats up 3.5 DEG C, and each power transmission is less than 8 minutes；
（7）When composition reaches: C:0.025-0.030%, Si:0.050-0.065%, P<0.033%, Ni:9.05 -
9.30%, Cr:17.05-17.35, N≤0.0140%, S≤0.002%, Ti >=5 (C+N)+0.04%.Temperature reaches 1545-1555
DEG C when it is outbound it is weak blow, weak blowing do not allow exposed liquid level, it is weak blow the time ensure more than 20 minutes；
（8）Argon ensures that more than 6 minutes middle bag will carry out sealing before continuous casting production injection molten steel, the degree of superheat of casting
Control ensures to start within more than 40 minutes casting at 50 DEG C or so in the molten steel calmness time, and Baogang's water is more than 20 in casting cycle
Ton, it is ensured that the floating of middle bag foreign substance in molten steel, seedling-growing time 60-85 seconds；
（9）Casting covering slag uses mould flux.
Compared with prior art, the beneficial effects of the present invention are：
1）Present invention process route be electric furnace smelting-AOD furnace decarburization, denitrogenation and reduction deoxidation-LF stoves deoxidation, Calcium treatment,
Skim, calmness-protective casting is blown in Ti Alloying and trimming and temperature adjustment-weak.
2）The present invention refined by AOD make the reduction of carbon nitrogen to a certain extent, reduce and reach the purpose of abundant deoxidation.In LF stoves
The use deoxidization technique of the novelty that enters the station, makes AOD tapping process oxygenation effectively be removed, and improves and stabilize receiving by the emperor himself
Rate, while reducing the generation of titanyl compound in steel, increase is weak to blow time and calm time, makes each type impurity in molten steel
Fully float, continuous casting takes the anti-secondary oxidation of protective casting, it is ensured that molten steel is not secondary polluted, Baogang's coolant-temperature gage in raising, has
Beneficial to inclusion floating, improve Molten Steel Cleanliness and prevent the nozzle blocking liquid stream shakiness from causing liquid fluctuating slag to cause sheet material table
There are inclusion defects in face.Substantially reduce the waste product caused in production.
Specific embodiment
The present invention is described further below：
Embodiment 1
Smelting stainless steel steel grade:321
1st, the clear composition of electric furnace smeltingization is:Electric furnace smelting Composition Control：C:2.1%, Si:2.3 %, P：0.024%, Ni:
10.45%, Cr:9.20%. 1645 DEG C of tapping temperature；
2nd, AOD refinings terminal composition is：C:0.019%, Si:0.0.39%, P：0.027%, Ni:9.15 %, Cr:17.26,
N：0.0050%, S：0.0015%.Smelting process whole process Argon, the basicity of strict control slag, reduction is using aluminium after first silicon, plus reduction
Stirred 5 minutes after material, tapping temperature is 1685 DEG C；
3rd, ladle shifts to an earlier date Argon 10 minutes before AOD tappings, and tapping hole is clean, taps 56 seconds time, while being added with steel stream
50kg pulverized limestones, will carry out taking off Slag treatment, ladle band slag thickness 35mm after tapping；
4th, LF stoves enter the station plus 500kg lime, and 200kg fluorites and 1000kg refining slags make new slag, while AL powder residue adjustments are added,
The basicity for detecting slag is 2.15, and the content of SiO2 is 7% in slag, the secondary deoxidation of aluminum steel is fed after energization slugging temperature adjustment, in inspection molten steel
Al content is 0.045%, and the treatment of 450m silicon-calcium wires is fed after deoxidation；
5th, the outbound preceding 10 points of kinds of LF stoves add ferrotianium, the Ti content 0.263% of molten steel；
6th, LF stoves refining process Argon mixing control is tried one's best not exposed molten steel, prevents molten steel and air contact nitrogen pick-up and secondary
Oxidation, molten steel to LF stoves carries out power transmission operation, and 3.5 DEG C of intensification per minute, each power transmission is less than 8 minutes；
7th, LF stoves composition is: C:0.028%, Si:0.058%, P:0.029%, Ni:9.05%, Cr:17.15%, N：
0.0126%, S：0.0012%, Ti:0.245%, 1545 DEG C of out-station temperature is weak to blow 22 minutes；
8th, Argon 11 minutes before continuous casting production injection molten steel.Middle bag sealing, 54 DEG C of the degree of superheat, molten steel 42 points of time of calmness
Clock, Baogang's water is 20 tons in casting cycle, seedling-growing time 75 seconds, casting cycle stabilization；
9th, casting covering slag uses mould flux.
Smelting operation is carried out using this method, the product surface quality for obtaining is good, is all primes and dispatches from the factory, without field trash
Class defect occurs, and user is good using reaction, uses same control method：Composition Control and other requirements are walked by the present invention
The scope control of rapid regulation produces 40 stoves, and inclusion defects, product quality stabilization occurs in none stove.
Claims (1)
1. a kind of smelting process of titanium-containing austenitic stainless steel sheet material, it is characterised in that：The method is carried out as steps described below：
(1) electric furnace smelting Composition Control：C:1.6-2.6%, Si:0.16-0.36%, P<0.026%, Ni:9.50-11.00%, Cr:
1600-1650 DEG C of 7.00-10.00%. tapping temperatures；
(2) AOD refinings terminal Composition Control：C:0.016-0.026%, Si:0.035-0.045%, P<0.028%, Ni:9.05 -
9.30%, Cr:17.05-17.35, N≤0.006%, S≤0.002%, reduction are more than using aluminium technique after first silicon, tapping temperature
1670℃；
(3) ladle will shift to an earlier date 10 minutes Argons before AOD tappings, and tapping is fast, while adding pulverized limestone with steel stream, reduction was tapped
Cheng Gangshui nitrogen pick-up and oxygen, will carry out taking off Slag treatment after tapping, and ladle band slag thickness is less than 50mm；
(4) LF stoves enter the station 500kg lime to be added, and 200kg fluorites and part refining slag make new slag, while adding AL powder residue adjustments, make
The basicity of slag is controlled in 2.0-2.2, while feeding the secondary deoxidation of aluminum steel, inspection makes the Al content in molten steel reach 0.35-0.55%
When, the oxygen content balanced in steel is 15ppm, feeds silicon-calcium wire treatment；
(5) Ti content of ferrotianium, molten steel is added to press the control of Ti >=5 (C+N)+0.06% before LF stoves are outbound；
(6) LF stoves refining process Argon mixing control is tried one's best not exposed molten steel, and molten steel to LF stoves carries out power transmission operation, liter per minute
3.5 DEG C of temperature, each power transmission is less than 8 minutes；
(7) when composition reaches: C:0.025-0.030%, Si:0.050-0.065%, P<0.033%, Ni:9.05-9.30%, Cr:
17.05-17.35, N≤0.0140%, S≤0.002%, Ti >=5 (C+N)+0.04%, temperature reaches outbound at 1545-1555 DEG C
Weak to blow, weak blowing do not allow exposed liquid level, weak to blow time guarantee more than 20 minutes；
(8) Argon ensured more than 6 minutes before continuous casting production injection molten steel, and middle bag will carry out sealing, casting degree of superheat control
At 50 DEG C or so, ensure to start within more than 40 minutes casting in the molten steel calmness time, Baogang's water is more than 20 tons in casting cycle, protects
The floating of bag foreign substance in molten steel in card, seedling-growing time 60-85 seconds；
(9) casting covering slag uses mould flux.
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105567907B (en) * | 2016-01-06 | 2017-12-01 | 山西太钢不锈钢股份有限公司 | A kind of method of austenitic stainless steel plastic occluded foreignsubstance control |
| CN105603154B (en) * | 2016-01-21 | 2017-09-01 | 山西太钢不锈钢股份有限公司 | Improve the smelting process of TDS2205 two phase stainless steel purity of steel |
| CN106319146B (en) * | 2016-08-29 | 2018-05-15 | 邢台钢铁有限责任公司 | 400 be the method for refining of free cutting stainless steel |
| CN107090537B (en) * | 2017-04-20 | 2019-01-11 | 成都先进金属材料产业技术研究院有限公司 | Control the smelting process of Valve Steel field trash |
| CN108559818A (en) * | 2018-05-03 | 2018-09-21 | 山西太钢不锈钢股份有限公司 | A kind of inclusion control method of flat cold-rolled sheet super clean austenitic stainless steel |
| CN110982982A (en) * | 2019-11-13 | 2020-04-10 | 甘肃酒钢集团宏兴钢铁股份有限公司 | LF refining method of titanium-containing austenitic stainless steel |
| CN112626425A (en) * | 2020-12-08 | 2021-04-09 | 山西太钢不锈钢股份有限公司 | Method for controlling welding seam dross of 316L self-fluxing welding material |
| CN113186445A (en) * | 2021-03-31 | 2021-07-30 | 中北大学 | Method for controlling inclusion content of stainless steel product |
| CN113136522B (en) * | 2021-04-26 | 2022-05-03 | 河南中原特钢装备制造有限公司 | Process for smelting titanium-containing austenitic stainless steel by argon oxygen furnace |
| CN113699429B (en) * | 2021-07-19 | 2022-10-11 | 北京科技大学 | Smelting process for reducing TP321 stainless steel seamless tube layering defects |
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| CN101121987A (en) * | 2007-09-22 | 2008-02-13 | 山西太钢不锈钢股份有限公司 | Smelting method for titanium-containing austenitic stainless steel |
| CN103225008A (en) * | 2013-04-22 | 2013-07-31 | 山西太钢不锈钢股份有限公司 | Method for preventing caking in crystallizer and nozzle clogging during process for smelting titanium-containing stainless steel |
| CN103741006A (en) * | 2014-01-09 | 2014-04-23 | 张家港浦项不锈钢有限公司 | Preparation method of Ti-containing low-nitrogen stainless steel |
| CN104294005A (en) * | 2013-07-19 | 2015-01-21 | 张家港浦项不锈钢有限公司 | Smelting method for Ti-containing stainless steel |
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| CN103225008A (en) * | 2013-04-22 | 2013-07-31 | 山西太钢不锈钢股份有限公司 | Method for preventing caking in crystallizer and nozzle clogging during process for smelting titanium-containing stainless steel |
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