CN113604723A - Rolled steel and control method for inclusions in rolled steel - Google Patents
Rolled steel and control method for inclusions in rolled steel Download PDFInfo
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- CN113604723A CN113604723A CN202110788189.5A CN202110788189A CN113604723A CN 113604723 A CN113604723 A CN 113604723A CN 202110788189 A CN202110788189 A CN 202110788189A CN 113604723 A CN113604723 A CN 113604723A
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- 239000010959 steel Substances 0.000 title claims abstract description 125
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 124
- 238000000034 method Methods 0.000 title claims abstract description 105
- 230000008569 process Effects 0.000 claims abstract description 80
- 238000007664 blowing Methods 0.000 claims abstract description 53
- 239000011575 calcium Substances 0.000 claims abstract description 49
- 238000005266 casting Methods 0.000 claims abstract description 46
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 39
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000007670 refining Methods 0.000 claims abstract description 36
- 238000009749 continuous casting Methods 0.000 claims abstract description 32
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 20
- 239000013589 supplement Substances 0.000 claims abstract description 19
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000956 alloy Substances 0.000 claims abstract description 11
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 11
- 238000003723 Smelting Methods 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 239000002893 slag Substances 0.000 claims description 87
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 80
- 229910052786 argon Inorganic materials 0.000 claims description 40
- 238000010079 rubber tapping Methods 0.000 claims description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 239000003795 chemical substances by application Substances 0.000 claims description 21
- 239000007789 gas Substances 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 19
- 238000007599 discharging Methods 0.000 claims description 15
- 229910052710 silicon Inorganic materials 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 8
- 229910052593 corundum Inorganic materials 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 8
- 239000010703 silicon Substances 0.000 claims description 8
- 239000002699 waste material Substances 0.000 claims description 8
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000007872 degassing Methods 0.000 claims description 6
- 230000005674 electromagnetic induction Effects 0.000 claims description 6
- 238000007654 immersion Methods 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 6
- 230000037431 insertion Effects 0.000 claims description 6
- 239000004571 lime Substances 0.000 claims description 6
- 239000003607 modifier Substances 0.000 claims description 6
- 238000009489 vacuum treatment Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 206010049040 Weight fluctuation Diseases 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000005275 alloying Methods 0.000 claims description 2
- 230000008859 change Effects 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 239000000047 product Substances 0.000 abstract description 10
- 230000006872 improvement Effects 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 230000004907 flux Effects 0.000 description 4
- 230000002262 irrigation Effects 0.000 description 4
- 238000003973 irrigation Methods 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 238000007667 floating Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 150000004645 aluminates Chemical class 0.000 description 2
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
- B22D11/117—Refining the metal by treating with gases
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- 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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- 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
- C21C7/072—Treatment with gases
-
- 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
- C21C7/10—Handling in a vacuum
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to rolled steel and a control method for inclusions in the rolled steel, wherein the rolled steel is produced by adopting the following control method: (1) converter smelting, (2) RH stove refining, (3) LF stove refining, (4) continuous casting protection casting, soft blowing and calcium treatment are carried out in the LF stove refining stage of step (3), soft blowing once for 3-5 min, the flow is 200-800 NL/min, calcium treatment line feeding amount is 160-220 m/stove, guarantee Ca of leaving a station: 20-35 ppm or more than or equal to 0.08 of Ca/Als, secondary soft blowing is carried out for 12-18 min after calcium treatment, the flow is 80-220 NL/min, aluminum supplement, alloy supplement and heating operation are forbidden in the soft blowing and calcium treatment process, and molten steel is strictly forbidden to be exposed in the soft blowing process. The control method of the invention can improve the quality of the rolled steel product, reduce the quality objection rate and finally achieve the purposes of cost reduction and efficiency improvement.
Description
Technical Field
The invention relates to the technical field of steel, in particular to rolled steel and a control method for inclusions in the rolled steel.
Background
With the continuous development of industry, chrome-plated steel strips obtained by performing chrome plating on rolled steel which is cold-rolled to the thickness of 0.1mm are widely applied to the food packaging and optical cable industries. In the production of rolled steel, the refining in steel mills usually adopts aluminum deoxidation, and Al is generated at the end point of the deoxidation2O3And aluminate inclusion, and needs calcium treatment to remove Al in order to meet the high requirement of ultrathin chromium-plated optical cable belt on cleanliness2O3And aluminate inclusions; light calcium treatment, improper soft blowing treatment and easy generation of CaO.2Al2O3And CaO.6 Al2O3The calcium aluminate is gathered and grown up in the inner part of a tundish or a water gap, is washed into a casting blank by molten steel and is captured by a casting blank shell, and CaO.2Al is generated during rolling2O3And CaO.6 Al2O3The steel strip has the characteristics of high melting point and difficult deformation, and exists in the form of particles in the steel strip. Large foreign matter (size) in the process of downstream customer cold rolling to 0.1mm chromium plating>50 μm inclusions) are intensively exposed, and further, the problems of holes in the finished product or breakage during drawing are caused, the normal use of the finished product is influenced, and the yield is low.
In order to control the surface quality and impurities of the casting blank in some steel mills, the casting blank surface polishing technology is adopted to remove the defects and impurities on the casting blank surface, the polishing depth is about 10-20 mm, and the production efficiency and the yield are low.
Disclosure of Invention
Aiming at the problems that the control difficulty of inclusions is high when rolled steel is smelted at present, and large inclusions are exposed to cause holes in finished products or fracture in the drawing process, the invention provides rolled steel and a control method of inclusions in the rolled steel, wherein the control method can improve the quality of rolled steel products, reduce the quality objection rate and finally achieve the purposes of cost reduction and efficiency improvement; the chemical components of the used molten steel can meet the performance requirement of high calendering, a proper soft blowing process is adopted, different processes are adopted to promote the floating removal of a deoxidation product according to different impurities formed at different refining periods, the molten steel with high cleanliness is produced, closure substances formed by enrichment and growth around a tundish or a water gap in the continuous casting process are prevented from being flushed into a crystallizer to form large-sized impurities, and the method has the advantage of simple operation.
In a first aspect, the invention provides a method for controlling inclusions in rolled steel, which sequentially comprises the following steps: (1) converter smelting, (2) RH furnace refining, (3) LF furnace refining, (4) continuous casting protection casting, wherein,
the molten steel used in the step (1) comprises the following chemical components in percentage by weight: 0.01% -0.04%, Si: 0-0.04%, Mn: 0.10% -0.30%, P: 0-0.020%, S: 0-0.005%, Al: 0.02% -0.05%, Ca: 0.0010% -0.0035%, N: 0-0.0050%, B: 0.0010 to 0.0030 percent, and the balance of Fe and inevitable impurities;
soft blowing and calcium treatment are carried out in the refining stage of the LF furnace in the step (3), soft blowing is carried out for 3-5 min for one time, the flow is 200-800 NL/min, the flow is properly increased, the argon blowing effect is 200-300 mm in argon flower diameter, large particle impurities generated in molten steel in the deoxidation process are promoted to be quickly removed in an upward floating mode, the calcium treatment wire feeding amount is 160-220 m/furnace, the wire feeding amount is properly adjusted for 40-50 m when the molten steel is abnormal (abnormal times such as first tundish furnace, slag discharge of a converter, tight rhythm and the like), and Ca outgoing is guaranteed: 20-35 ppm or more than or equal to 0.08 of Ca/Als, secondary soft blowing is carried out for 12-18 min after calcium treatment, the flow is 80-220 NL/min, long-time small-flow weak stirring promotes the modified small-particle inclusion to have sufficient time for gathering, growing, floating and removing, aluminum, alloy and heating operations are forbidden in the soft blowing and calcium treatment process, and the molten steel is strictly forbidden to be exposed in the soft blowing process.
Further, the tapping temperature in the step (1) is 1620-1640 ℃, T [ O ] is 450-750 ppm, the tapping hole is good, the tapping time is more than or equal to 4min, the steel flow has no flow scattering phenomenon, the tapping keeps off slag, 300kg of top slag lime and 100kg of modifier are added in the tapping process for slag washing, and deoxidation alloying is not carried out.
Furthermore, the number of times of the blowing supplement in the step (1) is not more than 1.
Further, in the step (2), the highest vacuum degree is less than or equal to 3mbar (pressure behind a vacuum valve), the vacuum treatment time is 8-20 min, the pure degassing time is more than or equal to 6min, and the condition that the effluent [ Als ]: 0.03 to 0.05 percent and less than or equal to 0.01 percent of outbound C.
Further, the refining time in the step (3) is 40-80 min, the whole process of LF refining is subjected to micro-positive pressure control, the wire feeding process is subjected to argon protection, and the process is added with N<10ppm, the molten steel is protected in the whole process to avoid the molten steel from forming inclusion by secondary oxidation, aluminum supplement is strictly forbidden in 8min before calcium treatment, the castability of the molten steel is ensured, and the final slag system target is [ CaO ]]：50％～60％、[Al2O3]：22％～34％、[SiO2]≤10％、[MgO]≤10％、FeO+MnO≤1.2％。
Further, baking time of the tundish in the step (4) is 3-4 hours, baking temperature is more than or equal to 1150 ℃, secondary oxidation of molten steel can be caused if tundish refractory materials contain water, the number of large inclusions with the size of more than 30 microns in the molten steel is increased, and in order to reduce the number of the large inclusions, the water in the tundish refractory materials is removed as far as possible;
inserting an argon gas replacement pipe from the ladle lifting device, pouring the large ladle until 10t of the middle ladle is poured, and closing argon gas replacement; the rest 15t of the previous ladle in the continuous casting furnace is started, and the next ladle is closed;
the large ladle is placed into a middle ladle, and the argon seal blowing flow rate of the large ladle is 30-75L/min;
the long water gap is sleeved right and vertical to the liquid level of the tundish; the water gap bowl is checked to have no cold steel in the continuous casting process, and the sealing gasket is ensured to be intact; the service time is less than or equal to 4 hours, and the insertion depth of the ladle nozzle is more than or equal to 200 mm; the continuous casting process is carried out by starting casting at a large ladle low position;
the slag of a large ladle (steel ladle) is discharged into a middle ladle, and firstly, the slag is coiled into molten steel to cause the increase of impurities; secondly, the steel slag has high oxidability, new inclusions are formed in steel, in order to reduce the increase of the inclusions caused by ladle slag discharging, the ladle slag discharging amount is strictly controlled, a ladle electromagnetic induction slag discharging system is adopted for ladle slag discharging, and a sliding plate is automatically closed when the proportion of the steel slag reaches 12% -30%;
low-silicon high-alkalinity tundish covering agent is adopted, and slag alkalinity in an impact area>3, FeO + MnO is less than or equal to 3 percent, the weight of the tundish molten steel is more than or equal to 30t, no molten steel is exposed in the casting process, the thickness of the covering agent is controlled to be less than or equal to 55mm,>carrying out deslagging operation at 60mm, and supplementing a low-silicon high-alkalinity covering agent; FeO + MnO is less than or equal to 3 percent, can reduce the oxidability of the covering agent, and avoid the generation of impurities due to the oxidation of the contact molten steel and the alkalinity of slag in an impact area>1.5, can promote Al in molten steel2O3Adsorption removal; more than or equal to 30t of the tundish, the actual residence time of the molten steel in the tundish can be stably controlled to be more than 10min, and large inclusions with the size of more than 50 mu m in the molten steel can be sufficiently floated and removed in the time.
Further, the pouring of the ladle molten steel in the step (4) is carried out for more than or equal to 8t, slag entrapment is avoided, the full ladle weight is more than or equal to 30t, and the fluctuation of the ladle molten steel weight in the continuous pouring process is less than or equal to 4 t;
controlling the argon blowing flow of the stopper rod according to 3-5 NL/min, and inserting the immersion nozzle into the stopper rod to a depth of 130-140 mm;
the consumption of the casting powder slag is 0.4-0.6 kg/t, the thickness of the liquid slag layer is 8-15 mm, the thickness of the total slag layer is 35-45 mm, and unsealed, overdue or wet casting powder slag cannot be used;
the pulling speed is executed according to the standard requirement of steel grade, the pulling speed is constant for continuous casting furnace time (except for water changing port), the pulling speed is strictly prohibited from changing frequently, and the pulling speed change in the process is less than or equal to 0.1 m/min;
performing waste cutting treatment on the casting blanks with the head blank size of 3m, the tail blank size of 2m and the water changing opening size of 2 m; draining, open casting, liquid level fluctuation +/-5 mm, and judging the type of low-grade steel or judging the waste of the corresponding casting blank.
And (3) further, in the ladle continuous casting ladle changing process in the step (4), argon is used for argon sealing in the tundish, the ladle is moved to a casting position, and low-position trickle casting is carried out. In the ladle changing process, after the ladle is poured, the molten steel is contacted with air, so that the molten steel is secondarily oxidized, the inclusions are increased, the large-flow pouring is started, the covering agent is impacted into the molten steel, and the inclusions are increased; in order to reduce the increase of inclusions in the ladle changing process, the contact between the exposed molten steel and air is controlled as much as possible, and the covering agent is prevented from being impacted into the molten steel due to overlarge casting flow.
In a second aspect, the present invention provides a rolled steel produced by the above control method.
The beneficial effect of the invention is that,
in order to meet the requirement of rolled steel on inclusion, the invention realizes the control of the quantity and the size of non-metal inclusions in steel by measures of furnace process optimization, refining process optimization, accurate calcium treatment, soft blowing time control, tundish slag oxidability control, continuous casting process ladle protection casting control, tundish molten steel residence time control, tundish refractory material water control, ladle slag control and the like, promotes the large inclusions to fully float, reduces the aggregation of high-melting-point calcium aluminate at a water gap, avoids the inclusion of the large inclusions caused by liquid level fluctuation, produces rolled steel with the inclusion size less than or equal to 30 mu m, controls the quantity of the large inclusions within a certain range, stabilizes the product quality, and greatly reduces quality defects such as holes, cracking and the like caused by the occurrence of inclusions in the use of customers.
The efficiency can be increased by 300 ten thousand yuan/year according to 30 yuan for each ton of steel and 10 ten thousand tons of annual rolled steel. Meanwhile, other steel grades with strict requirements on inclusions can be produced by adopting the technology of the invention, the cleanliness of other products is further improved, the market application is expanded, and the product competitiveness is improved.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A rolled steel is produced by adopting the following inclusion control method:
(1) smelting in a converter
Tapping temperature: 1625 ℃, T [ O ]: 497 ppm;
good tapping hole, tapping time: 4.8min, tapping hole frequency: 130 times, tapping and stopping slag, wherein the steel flow has no scattered flow phenomenon;
adding 300kg of top slag lime and 100kg of modifier in the tapping process for slag washing;
(2) RH furnace refining
Vacuum treatment time: 10min, pure degassing time: 8min, and ensuring that the maximum vacuum degree is less than or equal to 3mbar (pressure behind a vacuum valve);
outbound [ Als ]: 497ppm, outbound C: 60 ppm;
(3) refining in LF furnace
(3.1) refining time control: refining time is 57 min;
(3.2) aluminum supplement in the process: aluminum-containing alloy is not supplemented within 8min before calcium treatment;
(3.3) gas control: the whole process of LF refining is micro-positive pressure controlled, argon is protected in the wire feeding process, and N is increased by 5ppm in the process;
(3.4) final slag system target: [ CaO ]]：58.35％、[Al2O3]：29.67％、[SiO2]：3.87％、[MgO]：3.55％、FeO+MnO：0.84％；
(3.5) Soft blowing and calcium treatment: soft blowing for 4min at a time, wherein the flow rate is 520 NL/min; secondary soft blowing after calcium addition: 15min, 100NL/min of flow and 100-200 mm of creeping diameter of slag surface; no molten steel is exposed in the soft blowing process; calcium treatment criteria: line feeding amount 178 m/furnace, including [ Ca ]: 22 ppm; the soft blowing and calcium treatment processes do not have the operations of aluminum supplement, alloy supplement and heating;
(4) protective casting for continuous casting
(4.1) tundish baking time: 3.5h, baking temperature: 1160 ℃;
(4.2) argon replacement: after the ladle baking device is lifted, an argon gas replacement pipe is inserted, the ladle is started to be poured until 10t of the ladle is closed, argon gas replacement is started when 15t of the rest of the ladle in the previous ladle is continuously poured, and the ladle in the next ladle is started to be poured and closed;
(4.3) large package to medium package: the flow rate of the argon seal blowing gas of the large ladle is 70L/min;
(4.4) long nozzle: vertical to the liquid level of the tundish; the sealing gasket is intact; the service time is 1.2h, and the insertion depth of the ladle nozzle is 240 mm; the continuous casting process is carried out by starting casting at a large ladle low position;
(4.5) controlling the slag discharging of the ladle: a steel ladle electromagnetic induction slag discharging system is adopted, and a sliding plate is automatically closed when the proportion of steel slag reaches 15%;
(4.6) covering agent: the low-silicon high-alkalinity covering agent (the slag alkalinity in an impact area is more than 3, and FeO + MnO is less than or equal to 3 percent), no molten steel is exposed in the pouring process, and the thickness of the covering agent is 47 mm;
(4.7) the weight of the molten steel in the ladle: pouring the tundish molten steel 10t, wherein the full ladle weight is 31t, and the fluctuation of the tundish molten steel weight is less than or equal to 3t in the continuous casting process;
(4.8) controlling the argon blowing flow of the stopper rod according to 3.2NL/min, and inserting the immersion type water gap into the stopper rod to a depth of 135 mm;
(4.9) mold flux: the slag consumption is 0.45kg/t, the thickness of a liquid slag layer is 14mm, the thickness of a total slag layer is 45mm, and the casting powder is normal;
(4.10) the pulling speed is executed according to the standard requirement of the steel grade, the constant pulling speed of the continuous casting furnace (except for a water changing port) is kept, and the pulling speed is strictly prohibited from changing frequently; the pulling speed variation in the process is less than or equal to 0.1 m/min;
(4.11) carrying out waste cutting treatment on a casting blank with a head blank size of 3m, a tail blank size of 2m and a water changing opening size of 2 m; the liquid level fluctuation is less than or equal to +/-3 mm, and no drainage and open irrigation are performed in the generation process.
Statistics shows that the whole surface quality of the rolled steel is basically normal, and the total oxygen content of a casting blank is 16 ppm. The detected size of the inclusion is less than 12 mu m, and the phenomena of holes, cracking and the like caused by the inclusion are not generated.
Example 2
A rolled steel is produced by adopting the following inclusion control method:
(1) smelting in a converter
Tapping temperature: 1631 ℃, T [ O ]: 560 ppm;
good tapping hole, tapping time: 5.6min, tapping hole frequency: 47 times, the steel flow has no flow scattering phenomenon, tapping and slag blocking;
adding 300kg of top slag lime and 100kg of modifier in the tapping process for slag washing;
(2) RH furnace refining
Vacuum treatment time: 13min, pure degassing time: 9min, and ensuring that the maximum vacuum degree is less than or equal to 3mbar (pressure behind a vacuum valve);
outbound [ Als ]: 526ppm, outbound C: 83 ppm;
(3) refining in LF furnace
(3.1) refining time control: refining time is 49 min;
(3.2) aluminum supplement in the process: aluminum-containing alloy is not supplemented within 8min before calcium treatment;
(3.3) gas control: the whole process of LF refining is micro-positive pressure controlled, argon is protected in the wire feeding process, and N is increased by 3ppm in the process;
(3.4) final slag system target: [ CaO ]]：59.83％、[Al2O3]：31.16％、[SiO2]：3.56％、[MgO]：3.42％、FeO+MnO：0.72％；
(3.5) Soft blowing and calcium treatment: soft blowing for 3.5min for the first time, and the flow rate is 560 NL/min; secondary soft blowing after calcium addition: 16min, the flow rate is 90NL/min, and the creeping diameter of the slag surface is 100-200 mm; no molten steel is exposed in the soft blowing process; calcium treatment criteria: the line feeding amount is 192 m/furnace, and the secondary package [ Ca ]: 25 ppm; the soft blowing and calcium treatment processes do not have the operations of aluminum supplement, alloy supplement and heating;
(4) protective casting for continuous casting
(4.1) tundish baking time: 3.1h, baking temperature: 1190 deg.C;
(4.2) argon replacement: after the ladle baking device is lifted, an argon gas replacement pipe is inserted, the ladle is started to be poured until 10t of the ladle is closed, argon gas replacement is started when 15t of the rest of the ladle in the previous ladle is continuously poured, and the ladle in the next ladle is started to be poured and closed;
(4.3) large package to medium package: the flow rate of the argon seal blowing gas of the large ladle is 65L/min;
(4.4) long nozzle: vertical to the liquid level of the tundish; the sealing gasket is intact; the service time is 3.5h, and the insertion depth of the ladle nozzle is 220 mm; the continuous casting process is carried out by starting casting at a large ladle low position;
(4.5) controlling the slag discharging of the ladle: a steel ladle electromagnetic induction slag discharging system is adopted, and a sliding plate is automatically closed when the proportion of steel slag reaches 18 percent;
(4.6) covering agent: the low-silicon high-alkalinity covering agent (the slag alkalinity in an impact area is more than 3, and FeO + MnO is less than or equal to 3 percent), no molten steel is exposed in the pouring process, and the thickness of the covering agent is 42 mm;
(4.7) the weight of the molten steel in the ladle: pouring the tundish molten steel 10t, wherein the full ladle weight is 35t, and the fluctuation of the tundish molten steel weight is less than or equal to 3t in the continuous casting process;
(4.8) controlling the argon blowing flow of the stopper rod according to 4.2NL/min, and inserting the immersion type water gap into the stopper rod to reach the depth of 132 mm;
(4.9) mold flux: the slag consumption is 0.44kg/t, the thickness of a liquid slag layer is 12mm, the thickness of a total slag layer is 38mm, and the covering slag is normal;
(4.10) the pulling speed is executed according to the standard requirement of the steel grade, the constant pulling speed of the continuous casting furnace (except for a water changing port) is kept, and the pulling speed is strictly prohibited from changing frequently; the pulling speed variation in the process is less than or equal to 0.1 m/min;
(4.11) carrying out waste cutting treatment on a casting blank with a head blank size of 3m, a tail blank size of 2m and a water changing opening size of 2 m; the liquid level fluctuation is less than or equal to +/-3 mm, and no drainage and open irrigation are performed in the generation process.
Statistics shows that the integral surface quality of the rolled steel is basically normal, and the total oxygen content of a casting blank is 22 ppm. The detected size of the inclusion is less than 18 mu m, and the phenomena of holes, cracking and the like caused by the inclusion are not generated.
Example 3
A rolled steel is produced by adopting the following inclusion control method:
(1) smelting in a converter
Tapping temperature: 1628 ℃, T [ O ]: 468 ppm;
good tapping hole, tapping time: 5.2min, tapping hole frequency: 154 times, the steel flow has no flow scattering phenomenon, tapping and slag stopping;
adding 300kg of top slag lime and 100kg of modifier in the tapping process for slag washing;
(2) RH furnace refining
Vacuum treatment time: 12min, pure degassing time: 6min, and ensuring that the maximum vacuum degree is less than or equal to 3mbar (pressure behind a vacuum valve);
outbound [ Als ]: 376ppm, outbound C: 78 ppm;
(3) refining in LF furnace
(3.1) refining time control: refining time is 67 min;
(3.2) aluminum supplement in the process: aluminum-containing alloy is not supplemented within 8min before calcium treatment;
(3.3) gas control: the whole process of LF refining is micro-positive pressure controlled, argon is protected in the wire feeding process, and N is increased by 6ppm in the process;
(3.4) order of final slag systemMarking: [ CaO ]]：55.86％、[Al2O3]：30.69％、[SiO2]：3.27％、[MgO]：3.67％、FeO+MnO：0.97％；
(3.5) Soft blowing and calcium treatment: soft blowing for 4min at the flow rate of 630 NL/min; secondary soft blowing after calcium addition: the flow rate is 95NL/min for 18min, and the creeping diameter of the slag surface is 100-200 mm; no molten steel is exposed in the soft blowing process; calcium treatment criteria: line feeding amount 206 m/furnace, and secondary package [ Ca ]: 25 ppm; the soft blowing and calcium treatment processes do not have the operations of aluminum supplement, alloy supplement and heating;
(4) protective casting for continuous casting
(4.1) tundish baking time: 3.75h, baking temperature: 1183 deg.C;
(4.2) argon replacement: after the ladle baking device is lifted, an argon gas replacement pipe is inserted, the ladle is started to be poured until 10t of the ladle is closed, argon gas replacement is started when 15t of the rest of the ladle in the previous ladle is continuously poured, and the ladle in the next ladle is started to be poured and closed;
(4.3) large package to medium package: the flow rate of the argon seal blowing gas of the large bag is 56L/min;
(4.4) long nozzle: vertical to the liquid level of the tundish; the sealing gasket is intact; the service time is 2.3h, and the insertion depth of the ladle nozzle is 226 mm; the continuous casting process is carried out by starting casting at a large ladle low position;
(4.5) controlling the slag discharging of the ladle: a steel ladle electromagnetic induction slag discharging system is adopted, and a sliding plate is automatically closed when the proportion of steel slag reaches 12%;
(4.6) covering agent: the low-silicon high-alkalinity covering agent (the slag alkalinity in an impact area is more than 3, and FeO + MnO is less than or equal to 3 percent), no molten steel is exposed in the pouring process, and the thickness of the covering agent is 52 mm;
(4.7) the weight of the molten steel in the ladle: pouring the molten steel in the tundish at the weight of 9t, wherein the weight of the full ladle is 32t, and the weight fluctuation of the molten steel in the tundish during continuous casting is less than or equal to 4 t;
(4.8) controlling the argon blowing flow of the stopper rod according to 3.7NL/min, and inserting the immersion type water gap into the stopper rod to a depth of 136 mm;
(4.9) mold flux: the slag consumption is 0.55kg/t, the thickness of a liquid slag layer is 15mm, the thickness of a total slag layer is 42mm, and the covering slag is normal;
(4.10) the pulling speed is executed according to the standard requirement of the steel grade, the constant pulling speed of the continuous casting furnace (except for a water changing port) is kept, and the pulling speed is strictly prohibited from changing frequently; the pulling speed variation in the process is less than or equal to 0.05 m/min;
(4.11) carrying out waste cutting treatment on a casting blank with a head blank size of 3m, a tail blank size of 2m and a water changing opening size of 2 m; the liquid level fluctuation is less than or equal to +/-3 mm, and no drainage and open irrigation are performed in the generation process.
Statistics shows that the overall surface quality of the rolled steel is basically normal, and the total oxygen content of a casting blank is 19ppm and the nitrogen content is 26 ppm. The detected size of the inclusion is less than 14 mu m, and the phenomena of holes, cracking and the like caused by the inclusion are not generated.
Example 4
A rolled steel is produced by adopting the following inclusion control method:
(1) smelting in a converter
Tapping temperature: 1627 ℃, T [ O ]: 620 ppm;
good tapping hole, tapping time: 4.3min, tapping hole frequency: 68 times, tapping and stopping slag, wherein the steel flow has no scattered flow phenomenon;
adding 300kg of top slag lime and 100kg of modifier in the tapping process for slag washing;
(2) RH furnace refining
Vacuum treatment time: 9min, pure degassing time: 8min, and ensuring that the maximum vacuum degree is less than or equal to 3mbar (pressure behind a vacuum valve);
outbound [ Als ]: 425ppm, outbound C: 69 ppm;
(3) refining in LF furnace
(3.1) refining time control: refining time is 61 min;
(3.2) aluminum supplement in the process: aluminum-containing alloy is not supplemented within 8min before calcium treatment;
(3.3) gas control: the whole process of LF refining is micro-positive pressure controlled, argon is protected in the wire feeding process, and N is increased by 3ppm in the process;
(3.4) final slag system target: [ CaO ]]：58.21％、[Al2O3]：28.49％、[SiO2]：4.41％、[MgO]：3.89％、FeO+MnO：0.91％；
(3.5) Soft blowing and calcium treatment: soft blowing for 3.5min for the first time, and the flow rate is 540 NL/min; secondary soft blowing after calcium addition: 15min, 100NL/min of flow and 100-200 mm of creeping diameter of slag surface; no molten steel is exposed in the soft blowing process; calcium treatment criteria: wire feeding amount 196 m/furnace, and secondary package [ Ca ]: 23 ppm; the soft blowing and calcium treatment processes do not have the operations of aluminum supplement, alloy supplement and heating;
(4) protective casting for continuous casting
(4.1) tundish baking time: 3.2h, baking temperature: 1158 deg.C;
(4.2) argon replacement: after the ladle baking device is lifted, an argon gas replacement pipe is inserted, the ladle is started to be poured until 10t of the ladle is closed, argon gas replacement is started when 15t of the rest of the ladle in the previous ladle is continuously poured, and the ladle in the next ladle is started to be poured and closed;
(4.3) large package to medium package: the flow rate of the argon seal blowing gas of the large bag is 67L/min;
(4.4) long nozzle: vertical to the liquid level of the tundish; the sealing gasket is intact; the service time is 3.4h, and the insertion depth of the ladle nozzle is 210 mm; the continuous casting process is carried out by starting casting at a large ladle low position;
(4.5) controlling the slag discharging of the ladle: a steel ladle electromagnetic induction slag discharging system is adopted, and a sliding plate is automatically closed when the proportion of steel slag reaches 15%;
(4.6) covering agent: the low-silicon high-alkalinity covering agent (the slag alkalinity in an impact area is more than 3, and FeO + MnO is less than or equal to 3 percent), no molten steel is exposed in the pouring process, and the thickness of the covering agent is 50 mm;
(4.7) the weight of the molten steel in the ladle: pouring the molten steel in the tundish at 8t, wherein the weight of the full ladle is 36t, and the weight fluctuation of the molten steel in the tundish during continuous casting is less than or equal to 3 t;
(4.8) controlling the argon blowing flow of the stopper rod according to 4.2NL/min, and inserting the immersion type water gap into the stopper rod to a depth of 135 mm;
(4.9) mold flux: the slag consumption is 0.50kg/t, the thickness of a liquid slag layer is 13mm, the thickness of a total slag layer is 41mm, and the covering slag is normal;
(4.10) the pulling speed is executed according to the standard requirement of the steel grade, the constant pulling speed of the continuous casting furnace (except for a water changing port) is kept, and the pulling speed is strictly prohibited from changing frequently; the pulling speed variation in the process is less than or equal to 0.1 m/min;
(4.11) carrying out waste cutting treatment on a casting blank with a head blank size of 3m, a tail blank size of 2m and a water changing opening size of 2 m; the liquid level fluctuation is less than or equal to +/-3 mm, and no drainage and open irrigation are performed in the generation process.
Statistics shows that the whole surface quality of the rolled steel is basically normal, and the total oxygen content of a casting blank is 24ppm and the nitrogen content is 30 ppm. The detection size of the inclusions is less than 20 mu m, the number of holes caused by the inclusions in the finished product is less than 0.5/t, the phenomena of cracking caused by the inclusions and the like do not occur, and the requirements of customers are met.
According to the embodiment, the rolled steel produced by the method can meet the control requirement of customers on the inclusion and meet the requirement of the customers on the maximization of the profits.
Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention.
Claims (9)
1. The control method for inclusions in rolled steel is characterized by sequentially comprising the following steps of: (1) converter smelting, (2) RH furnace refining, (3) LF furnace refining, (4) continuous casting protection casting, wherein,
the molten steel used in the step (1) comprises the following chemical components in percentage by weight: 0.01% -0.04%, Si: 0-0.04%, Mn: 0.10% -0.30%, P: 0-0.020%, S: 0-0.005%, Al: 0.02% -0.05%, Ca: 0.0010% -0.0035%, N: 0-0.0050%, B: 0.0010 to 0.0030 percent, and the balance of Fe and inevitable impurities;
and (3) carrying out soft blowing and calcium treatment in the refining stage of the LF furnace, wherein soft blowing is carried out for 3-5 min for one time, the flow is 200-800 NL/min, the calcium treatment line feeding amount is 160-220 m/furnace, the line feeding amount is properly adjusted to 40-50 m when molten steel is abnormal, and the Ca is ensured to be discharged: 20-35 ppm or more than or equal to 0.08 of Ca/Als, secondary soft blowing is carried out for 12-18 min after calcium treatment, the flow is 80-220 NL/min, aluminum supplement, alloy supplement and heating operation are forbidden in the soft blowing and calcium treatment process, and molten steel is strictly forbidden to be exposed in the soft blowing process.
2. The control method according to claim 1, wherein the tapping temperature in the step (1) is 1620-1640 ℃, T [ O ] is 450-750 ppm, the tapping hole is good, the tapping time is more than or equal to 4min, the steel flow does not have a free flow phenomenon, the tapping is carried out for slag stopping, 300kg of top slag lime and 100kg of modifier are added in the tapping process for slag washing, and deoxidation alloying is not carried out.
3. The control method according to claim 1, wherein the number of the additionally blowing in the step (1) does not exceed 1.
4. The control method according to claim 1, wherein the maximum vacuum degree in the step (2) is less than or equal to 3mbar, the vacuum treatment time is 8-20 min, the pure degassing time is more than or equal to 6min, and the output [ Als ]: 0.03 to 0.05 percent and less than or equal to 0.01 percent of outbound C.
5. The control method of claim 1, wherein the refining time in the step (3) is 40-80 min, the whole LF refining process is controlled by micro-positive pressure, the wire feeding process is protected by argon, and the process is increased by N<10ppm, strictly forbidding aluminum supplement within 8min before calcium treatment, and the final slag system target is [ CaO]：50％～60％、[Al2O3]：22％～34％、[SiO2]≤10％、[MgO]≤10％、FeO+MnO≤1.2％。
6. The control method according to claim 1, wherein the baking time in the step (4) is 3-4 h, and the baking temperature is more than or equal to 1150 ℃;
inserting an argon gas replacement pipe from the ladle lifting device, pouring the large ladle until 10t of the middle ladle is poured, and closing argon gas replacement; the rest 15t of the previous ladle in the continuous casting furnace is started, and the next ladle is closed;
the large ladle is placed into a middle ladle, and the argon seal blowing flow rate of the large ladle is 30-75L/min;
the long water gap is sleeved right and vertical to the liquid level of the tundish; the water gap bowl is checked to have no cold steel in the continuous casting process, and the sealing gasket is ensured to be intact; the service time is less than or equal to 4 hours, and the insertion depth of the ladle nozzle is more than or equal to 200 mm; the continuous casting process is carried out by starting casting at a large ladle low position;
the ladle slag discharging adopts a ladle electromagnetic induction slag discharging system, and the sliding plate is automatically closed when the proportion of the steel slag reaches 12-30 percent;
the low-silicon high-alkalinity tundish covering agent is adopted, the slag alkalinity of an impact area is greater than 3, FeO + MnO is less than or equal to 3%, the weight of tundish molten steel is greater than or equal to 30t, no molten steel is exposed in the casting process, the thickness of the covering agent is controlled to be less than or equal to 55mm and greater than 60mm, slag discharging operation is carried out, and the low-silicon high-alkalinity covering agent is supplemented.
7. The control method according to claim 6, characterized in that casting is carried out for the weight of the ladle molten steel in the step (4) being more than or equal to 8t, slag entrapment is avoided, the full ladle weight is more than or equal to 30t, and the weight fluctuation of the ladle molten steel in the continuous casting process is less than or equal to 4 t;
controlling the argon blowing flow of the stopper rod according to 3-5 NL/min, and inserting the immersion nozzle into the stopper rod to a depth of 130-140 mm;
the consumption of the casting powder slag is 0.4-0.6 kg/t, the thickness of the liquid slag layer is 8-15 mm, the thickness of the total slag layer is 35-45 mm, and unsealed, overdue or wet casting powder slag cannot be used;
the pulling speed is executed according to the standard requirement of steel grades, the pulling speed is constant in continuous casting furnace time, the pulling speed is strictly prohibited from changing frequently, and the pulling speed change in the process is less than or equal to 0.1 m/min;
performing waste cutting treatment on the casting blanks with the head blank size of 3m, the tail blank size of 2m and the water changing opening size of 2 m; draining, open casting, liquid level fluctuation +/-5 mm, and judging the type of low-grade steel or judging the waste of the corresponding casting blank.
8. The control method according to claim 6, wherein in the step (4), the ladle continuous casting ladle exchanging process is carried out, argon sealing is carried out on the tundish by argon gas exchange, the ladle is moved to a casting position, and low-position trickle casting is carried out.
9. A rolled steel, characterized in that it is produced by the control method according to any one of claims 1 to 8.
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Denomination of invention: A control method for rolled steel and inclusions in rolled steel Effective date of registration: 20231215 Granted publication date: 20220701 Pledgee: Rizhao Bank Co.,Ltd. Pledgor: RIZHAO STEEL HOLDING GROUP Co.,Ltd. Registration number: Y2023980072204 |