CN110484685A - The control method of titaniferous stainless steel dross - Google Patents
The control method of titaniferous stainless steel dross Download PDFInfo
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- CN110484685A CN110484685A CN201910878406.2A CN201910878406A CN110484685A CN 110484685 A CN110484685 A CN 110484685A CN 201910878406 A CN201910878406 A CN 201910878406A CN 110484685 A CN110484685 A CN 110484685A
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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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- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- Chemical & Material Sciences (AREA)
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- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a kind of control methods of titaniferous stainless steel dross, and a large amount of aluminium ingots, fluorite are added with ferrosilicon, electrolytic manganese in oxidation latter stage addition manganese ore, reduction process in GOR furnace or AOD furnace, reacts in desulphurization, forms SiO2‑Al2O3- MgO-MnO slag system, while guaranteeing the deoxidation effectiveness of aluminium, aluminium and fluorite can inhibit MgO-Al in slag system2O3The generation of spinel inclusion object, magnesium oxide concentration is very low in molten steel, and it is nearly free from magnesium aluminate spinel field trash, magnesium aluminate spinel brittle inclusion greatly reduces in molten steel, and O, N are effectively controlled in molten steel, reduces the generation of titanium oxide or titanium nitride, thus titaniferous stainless steel dross phenomenon is significantly reduced, to improve pourability of molten steel, casting sequence is increased, fundamentally solves Ti-containing steel wadding flow problem.
Description
Technical field
The present invention relates to stainless steel-making process more particularly to a kind of control methods of titaniferous stainless steel dross.
Background technique
Chromium-austenitic stainless steel is heated 450~800 DEG C of humidity provinces, and the corrosion failure along crystal boundary often occurs, referred to as brilliant
Between corrode.It is generally believed that intercrystalline corrosion is that carbon is precipitated in the form of Cr23C6 from the austenite of saturation, cause grain boundaries austenite poor
Caused by chromium.Such as by various elements by the big minispread of affinity with carbon, sequence are as follows: Ti, Zr, V, Nb, W, Mo, Cr, Mn.Therefore Ti
After being added in steel, carbon preferentially generates titanium carbide (TiC) in conjunction with Ti, avoids that chromium carbide is precipitated and causes crystal boundary poor in this way
Chromium, to effectively prevent intercrystalline corrosion.But titaniferous stainless steel difficulty in casting is larger, due to the binding ability of titanium and oxygen and nitrogen
It is very strong, and the titanium oxide or titanium nitride flocculent structure that generate easily block the mouth of a river, cause casting sequence few.
Chinese Patent Application No. 201510868315.2 discloses a kind of long continuous casting control method of titanium-containing austenitic stainless steel,
Its control method step are as follows: (1) whole blowing argon gas in AOD refining furnace is added after the smelting molten steel of electric arc furnaces is good and smelts；(2) it restores
Phase ferrosilicon, fluorite investment terminate to add Al progress deep deoxidation, and stirring terminates reduction, guarantees tapping temperature；(3) after AOD refining
Molten steel enter LF after, temperature is initially added into Ti line when being 1580 ~ 1590 DEG C, and additional amount is that molten steel guarantee is made to meet Ti >=6C,
And carry out micro- stirring；(4) molten steel goes out tapping when composition of steel is met the requirements of the standard, and guarantees Ti*N and Ca/Al.The present invention by from
Control of AOD to the LF to O, N in molten steel reduces the generation of titanium oxide or titanium nitride to a certain extent, but uses aluminium deoxidation, meeting
A large amount of to form magnesium aluminate spinel field trash, this kind of inclusion melting point is higher, and hardness is big, is easy to be deposited on inside submersed nozzle,
Wadding stream and nozzle blocking are caused, in addition, a large amount of magnesium aluminate spinel field trashes will increase titanium nitride containing core, influences final products
Quality.
Summary of the invention
The purpose of the present invention is to provide a kind of control methods of titaniferous stainless steel dross.
Realizing the technical solution of the object of the invention is: a kind of control method of titaniferous stainless steel dross comprising following step
It is rapid:
1) in smelting half steel in LD converter；
2) GOR furnace or AOD furnace are smelted: smelting in furnace includes oxidation stage and reduction phase, wherein latter stage in furnace internal oxidition stage adds
Enter manganese ore, ferrosilicon, electrolytic manganese, aluminium ingot and fluorite is added in reduction phase；The dosage of MnO% > 32% in the manganese ore, manganese ore is many
In 1.50kg/ tons of steel, aluminium ingot additional amount is 5-7kg/ tons of steel, and fluorite additional amount is no less than 5kg/ tons of steel；The electrolytic manganese addition
Amount is 11~13kg/ tons of steel, and ferrosilicon additive amount is 25~33kg/ tons of steel；
3) molten steel in LF furnace according to carbon content feed titanium wire, then feed 300~400 meters of calcium line, Argon 10 minutes or more, calmness 15
Minute or more, after treatment requires the mass content of calcium in steel to control in 5~15ppm, and goes out composition of steel in molten steel and meet mark
It taps when alignment request, titanium wire additive amount is subject to out Ti content >=5 in composition of steel (C+N).
Further, the manganese ore that latter stage addition is aoxidized in the step 2 is 1.50~2.50kg/ tons of steel.
Further, fluorite additional amount is 5~6kg/ tons of steel in reduction process in the step 2.
The present invention is in GOR furnace or AOD furnace with ferrosilicon, electrolytic manganese in oxidation latter stage addition manganese ore, reduction process
A large amount of aluminium ingots, fluorite are added, react in desulphurization, form SiO2-Al2O3- MgO-MnO slag system, in the deoxidation for guaranteeing aluminium
While efficiency, aluminium and fluorite can inhibit MgO-Al in slag system2O3The generation of spinel inclusion object, magnesium oxide concentration in molten steel
It is very low, and it is nearly free from magnesium aluminate spinel field trash, magnesium aluminate spinel brittle inclusion greatly reduces in molten steel, and in molten steel
O, N is effectively controlled, and reduces the generation of titanium oxide or titanium nitride, thus significantly reduces titaniferous stainless steel dross phenomenon,
To improve pourability of molten steel, casting sequence is increased, fundamentally solves Ti-containing steel wadding flow problem.
Detailed description of the invention
Fig. 1 is the quarternary phase diagram of slag system of the present invention.
Specific embodiment
It elaborates below in conjunction with attached drawing to present pre-ferred embodiments.
Embodiment 1
A kind of control method of titaniferous stainless steel dross comprising following steps:
1) in smelting half steel in LD converter；
2) GOR furnace is smelted, 100 tons of tap meters, and wherein manganese ore 2kg is added in furnace internal oxidition latter stage, and ferrosilicon, electricity is added in reduction phase
Xie Meng, aluminium ingot and fluorite；MnO% > 32% in the manganese ore, aluminium ingot additional amount are 500kg, and fluorite additional amount is 500kg, described
Electrolytic manganese additive amount is 12kg/ tons of steel, and ferrosilicon additive amount is 32kg/ tons of steel；
3) titanium wire is fed according to carbon content in LF furnace, then feeds 300 meters of calcium line, Argon 13 minutes, 18 minutes calm, processing terminate
Require the mass content of calcium in steel to control in 7ppm afterwards, molten steel goes out tapping when composition of steel is met the requirements of the standard, titanium wire additive amount with
Out in composition of steel subject to Ti content >=5 (C+N).
After the technical process, casting sequence increases to 4-5 furnace by 1 furnace.
Present invention tapping component requirements are as shown in table 1:
Table 1:
Comparative example 1
Comparative example 1 uses scheme substantially the same manner as Example 1, and difference difference is in the step 2) of comparative example 1 that GOR furnace is smelted
Oxidation latter stage do not add manganese ore.The program causes nozzle clogging serious, dead less than a furnace mouth of a river, that is, dross wadding.
Embodiment 2-4
Embodiment 2-4 uses technique identical with embodiment, and difference is slightly different in projects parameter.Design parameter such as 2 institute of table
Show:
Table 2
In the control method of titaniferous stainless steel dross of the present invention, manganese is added in oxidation latter stage in GOR furnace or AOD furnace in the present invention
Mine is added a large amount of aluminium ingots, fluorite with ferrosilicon, electrolytic manganese in reduction process, reacts in desulphurization, molten steel is formed
SiO as shown in Figure 12-Al2O3- MgO-MnO slag system is greater than by the binding ability of the visible manganese oxide of the quarternary phase diagram and aluminium oxide
The combination of aluminium oxide and magnesia, manganese oxide, aluminium oxide, silica form deformable plasticity and are mingled with, magnesia in field trash
Content it is still very low, and be nearly free from spinel inclusion object.The present invention is utilizing a large amount of aluminium ingot control oxygen, drop as a result,
The low generation of titanium oxide or titanium nitride while controlling titaniferous stainless steel dross problem, and effectively controls spinelle folder
The generation of sundries fundamentally solves titaniferous stainless steel wadding flow problem.
The dosage of manganese ore of the present invention cannot be below 1.50kg/ tons of steel, to guarantee the minimum in slag system, for production
Cost consideration, it is preferable that manganese ore dosage is not higher than 2.50kg/ tons of steel；The electrolytic manganese additive amount be 11~13kg/ tons of steel so that
Mn content reaches requirement in composition of steel out；Ferrosilicon is used as the reducing agent in GOR furnace or AOD furnace, and additive amount is 25~33kg/ tons
Steel；The aluminium ingot dosage cannot be below 5 kg/ tons of steel, and to guarantee the minimum requirements of deoxidation in slag system, more than 7 kg/ tons steel then can
Too many aluminate is generated, wadding stream is easy；Fluorite (CaF) dosage cannot be below 5 kg/ tons of steel, to guarantee quaternary
Aluminium oxide is deviated to the deformable direction that is mingled in slag system, is considered for production cost, it is preferable that fluorite dosage is not higher than 6kg/ tons
Steel；The mass content of calcium cannot be below 5ppm in steel, to guarantee to be denaturalized in conjunction with aluminium oxide, if containing more than aluminium in 15ppm calcium line
Measure higher, easy wadding stream.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent process transformation made by bright description is applied directly or indirectly in other relevant technical fields, and similarly wraps
It includes in scope of patent protection of the invention.
Claims (3)
1. a kind of control method of titaniferous stainless steel dross, it is characterised in that: itself the following steps are included:
1) in smelting half steel in LD converter；
2) GOR furnace or AOD furnace are smelted: smelting in furnace includes oxidation stage and reduction phase, wherein latter stage in furnace internal oxidition stage adds
Enter manganese ore, ferrosilicon, electrolytic manganese, aluminium ingot and fluorite is added in reduction phase；The dosage of MnO% > 32% in the manganese ore, manganese ore is many
In 1.50kg/ tons of steel, aluminium ingot additional amount is 5~7kg/ tons of steel, and fluorite additional amount is no less than 5kg/ tons of steel；The electrolytic manganese addition
Amount is 11~13kg/ tons of steel, and ferrosilicon additive amount is 25~33kg/ tons of steel；
3) molten steel in LF furnace according to carbon content feed titanium wire, then feed 300~400 meters of calcium line, Argon 10 minutes or more, calmness 15
Minute or more, after treatment requires the mass content of calcium in steel to control in 5~15ppm, and goes out composition of steel in molten steel and meet mark
It taps when alignment request, titanium wire additive amount is subject to out Ti content >=5 in composition of steel (C+N).
2. the control method of titaniferous stainless steel dross according to claim 1, it is characterised in that: aoxidized in the step 2
The manganese ore of latter stage addition is 1.50~2.50kg/ tons of steel.
3. the control method of titaniferous stainless steel dross according to claim 1, it is characterised in that: restored in the step 2
Fluorite additional amount is 5~6kg/ tons of steel in the process.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112063801A (en) * | 2020-09-17 | 2020-12-11 | 浦项(张家港)不锈钢股份有限公司 | Stainless steel and preparation method thereof |
| CN113528928A (en) * | 2021-07-15 | 2021-10-22 | 山西太钢不锈钢股份有限公司 | Iron-nickel base alloy continuous casting billet for precision strip steel and production method thereof |
| CN114807752A (en) * | 2022-04-13 | 2022-07-29 | 太原钢铁(集团)有限公司 | Low-cost high-titanium heat-resistant austenitic stainless steel and preparation method thereof |
| CN114959423A (en) * | 2022-06-07 | 2022-08-30 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Smelting method of high-silicon titanium-containing austenitic stainless steel |
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| CN102199684A (en) * | 2010-03-25 | 2011-09-28 | 宝山钢铁股份有限公司 | Production method of ultralow-oxygen titanium-containing ferrite stainless steel |
| CN106282832A (en) * | 2016-08-06 | 2017-01-04 | 山东泰山钢铁集团有限公司 | Hot-metal bottle dephosphorization, refining furnace and Argon station smelt titaniferous ferritic stainless steel method |
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2019
- 2019-09-18 CN CN201910878406.2A patent/CN110484685A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102199684A (en) * | 2010-03-25 | 2011-09-28 | 宝山钢铁股份有限公司 | Production method of ultralow-oxygen titanium-containing ferrite stainless steel |
| CN106282832A (en) * | 2016-08-06 | 2017-01-04 | 山东泰山钢铁集团有限公司 | Hot-metal bottle dephosphorization, refining furnace and Argon station smelt titaniferous ferritic stainless steel method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112063801A (en) * | 2020-09-17 | 2020-12-11 | 浦项(张家港)不锈钢股份有限公司 | Stainless steel and preparation method thereof |
| CN113528928A (en) * | 2021-07-15 | 2021-10-22 | 山西太钢不锈钢股份有限公司 | Iron-nickel base alloy continuous casting billet for precision strip steel and production method thereof |
| CN114807752A (en) * | 2022-04-13 | 2022-07-29 | 太原钢铁(集团)有限公司 | Low-cost high-titanium heat-resistant austenitic stainless steel and preparation method thereof |
| CN114959423A (en) * | 2022-06-07 | 2022-08-30 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Smelting method of high-silicon titanium-containing austenitic stainless steel |
| CN114959423B (en) * | 2022-06-07 | 2023-04-14 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Smelting method of high-silicon titanium-containing austenitic stainless steel |
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