CN117363952A - Method for producing SPHD (specific surface Mount device) in low cost and short process - Google Patents
Method for producing SPHD (specific surface Mount device) in low cost and short process Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 50
- 230000008569 process Effects 0.000 title claims abstract description 48
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 36
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 132
- 239000010959 steel Substances 0.000 claims abstract description 132
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000002893 slag Substances 0.000 claims abstract description 60
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 44
- 229910052786 argon Inorganic materials 0.000 claims abstract description 31
- 229910052742 iron Inorganic materials 0.000 claims abstract description 22
- 238000007664 blowing Methods 0.000 claims abstract description 20
- 238000007670 refining Methods 0.000 claims abstract description 20
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 19
- 239000011575 calcium Substances 0.000 claims abstract description 19
- 238000009749 continuous casting Methods 0.000 claims abstract description 17
- 238000010079 rubber tapping Methods 0.000 claims abstract description 14
- 238000005266 casting Methods 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 206010039897 Sedation Diseases 0.000 claims abstract description 11
- 230000036280 sedation Effects 0.000 claims abstract description 11
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 6
- 238000003723 Smelting Methods 0.000 claims abstract description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 6
- 239000004571 lime Substances 0.000 claims abstract description 6
- 238000005275 alloying Methods 0.000 claims abstract description 5
- 230000004048 modification Effects 0.000 claims abstract description 5
- 238000012986 modification Methods 0.000 claims abstract description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 5
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 5
- 238000012546 transfer Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 239000007791 liquid phase Substances 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 4
- 238000005261 decarburization Methods 0.000 claims description 3
- 238000009792 diffusion process Methods 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- 229910014458 Ca-Si Inorganic materials 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000005728 strengthening Methods 0.000 claims 2
- 230000003647 oxidation Effects 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 claims 1
- 230000001590 oxidative effect Effects 0.000 claims 1
- 238000007789 sealing Methods 0.000 claims 1
- 238000005245 sintering Methods 0.000 claims 1
- 208000028659 discharge Diseases 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 10
- 238000005189 flocculation Methods 0.000 description 7
- 230000016615 flocculation Effects 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 229910001868 water Inorganic materials 0.000 description 7
- 238000007872 degassing Methods 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 239000002699 waste material Substances 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 229910052593 corundum Inorganic materials 0.000 description 4
- 239000004615 ingredient Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 229910001845 yogo sapphire Inorganic materials 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
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- 239000007789 gas Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
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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
-
- 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
- C21C7/0006—Adding metallic additives
-
- 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
- C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
-
- 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
-
- 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
- C21C7/068—Decarburising
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention relates to the technical field of SPHD, in particular to a method for producing SPHD with low cost and short process, which comprises the following steps: a. preparing molten iron and scrap steel; b. b, converter blowing, namely feeding molten iron prepared in the step a into a converter in a one-tank-to-bottom mode, and adding prepared scrap steel into the converter to perform blowing; c. b, refining in an argon station, after smelting, feeding molten steel in a converter into a ladle to finish a tapping process, performing white steel discharge treatment during tapping, simultaneously increasing the temperature by 13-20 ℃ on the basis of the step b, adding sinter, lime and refining slag along with a steel flow, and then performing deoxidization alloying operation in the argon station, slag modification treatment, calcium treatment, argon blowing and ladle sedation; d. continuous casting: and (5) protecting pouring by a large ladle, deslagging by a middle ladle, and electromagnetic stirring by a crystallizer to finally obtain a qualified casting blank. The technological treatment process is shortened, the energy medium consumption can be reduced, the cost is reduced, and the indexes of the finally obtained product are easy to control.
Description
Technical Field
The invention relates to the technical field of SPHD, in particular to a method for producing SPHD with low cost and short process.
Background
SPHD is the brand of steel, the steel grade is ultra-low carbon low silicon steel, and enterprises put in practical production
The carbon content is less than or equal to 0.05%, the difficulty of controlling the carbon content in the inner control is less than or equal to 0.03% is relatively large, if the converter is forced to pull carbon, the consumption of the steel materials and the descending of the converter under the condition of the converter is increased, the process is complex, the production process is generally complex, the cost is high, in order to ensure the product quality, particularly, the aluminum products are used for deoxidizing a large proportion during the production of the steel, the flocculation of the tundish and the water gap is easy to be caused, and the flocculation shutdown accident can be caused in serious cases. The water gap flocculation flow refers to the phenomenon that solid particles in molten steel are attached to the inner wall of a large water tank water gap, a tundish water gap or a submerged nozzle in the continuous casting production process, and adsorb, expand and occupy a steel flow channel to reduce the steel passing amount of the molten steel, and finally, the molten steel cannot be complemented in time to cut off or quickly replace the submerged nozzle.
The prior art adopted in the production of SPHD steel in a steel mill needs to be subjected to molten iron pretreatment, converter blowing, refining (LF-refining furnace) for ingredient and temperature fine adjustment, argon blowing after calcium treatment, RH (degassing furnace) treatment, tundish casting, electromagnetic stirring of a crystallizer, continuous casting and a series of treatment processes to achieve and improve the quality of molten steel and the continuous casting property of molten steel, and the production cost of the traditional process mainly comes from steel material consumption, energy medium consumption and refractory material consumption, and the energy medium consumption mainly comprises steam, oxygen, water, argon, coal gas, smelting electricity and the like, so that the production cost is high, the working procedure is complex, and the production efficiency is low.
Disclosure of Invention
The present invention aims to provide a method for producing SPHD with low cost and short process, which solves the problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a method for producing SPHD with low cost and short process, a, preparing molten iron and scrap steel;
b. b, converter blowing, namely feeding molten iron prepared in the step a into a converter in a one-tank-to-bottom mode, and adding prepared scrap steel into the converter to perform blowing;
c. b, refining in an argon station, after smelting, feeding molten steel in a converter into a ladle to finish a tapping process, performing white steel discharge treatment during tapping, simultaneously increasing the temperature by 13-20 ℃ on the basis of the step b, adding sinter, lime and refining slag along with a steel flow, and then performing deoxidization alloying operation in the argon station, slag modification treatment, calcium treatment, argon blowing and ladle sedation;
d. continuous casting: and (5) protecting pouring by a large ladle, deslagging by a middle ladle, and electromagnetic stirring by a crystallizer to finally obtain a qualified casting blank. The technological treatment process is shortened, the energy medium consumption can be reduced, the cost is reduced, and the indexes of the finally obtained product are easy to control.
Compared with the prior art, the invention has the beneficial effects that:
1. the method for producing the SPHD at low cost and short process is free from LF refining and RH degassing treatment, white steel is placed in the tapping process (i.e. no deoxidizer and alloy are added in the tapping process, the carbon content in the molten steel is reduced by adopting the reaction of ferric oxide in the sinter and carbon in the molten steel), the steel is directly treated in an argon station after a furnace (steel core aluminum is added for precipitation deoxidation, then alloy is added for alloying, and finally diffusion deoxidation top slag production treatment is carried out), the process treatment process is shortened, the energy medium consumption can be reduced, the cost is reduced, and finally the indexes of the obtained product are easy to control.
The method for producing SPHD with low cost and short process changes the RH vacuum decarburization function into tapping without deoxidizing agent to put white steel, reduces the carbon content of molten steel through the reaction of sinter and carbon in the molten steel, does not use special equipment for decarburization, changes the LF refining function into argon station slag formation and calcium treatment, reduces the electric loss and equipment loss of a refining furnace, and adopts the main process of molten iron pretreatment, blowing argon in an argon station, LF-refining furnace, blowing argon after calcium treatment, RH degassing, tundish casting, crystallizer electromagnetic stirring, continuous casting, blowing argon after calcium treatment in an argon station, tundish casting, crystallizer electromagnetic stirring, continuous casting; the produced product meets the requirements of clients, and meanwhile, the cost of manpower and material resource equipment is obviously reduced.
Drawings
FIG. 1 is a schematic diagram of the overall flow of the present invention;
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a number" is two or more, unless explicitly defined otherwise.
The invention provides a technical scheme that:
the method for producing the SPHD with low cost and short process is used;
a. preparing molten iron and scrap steel
Producing molten iron by using a blast furnace, wherein the temperature of the finally obtained molten iron is 1310 ℃, the slag quantity of the molten iron is 1cm, the C content in the molten iron is 4.80%, the Mn content in the molten iron is 0.45%, the S content is less than or equal to 0.02%, the P content is less than or equal to 0.09%, the Si content is 0.40%, preparing scrap steel for standby, and the mass ratio of the scrap steel to the molten iron is 1:4, adding 25 tons of scrap steel into every 100 tons of molten iron;
according to the invention, waste steel is reasonably matched according to different required end temperature of molten steel, the waste steel cannot be wet, cannot have inflammable and explosive articles, cannot have harmful rare metals, cannot have a sealed container, cannot have slag soil and refractory materials, the mass percentage of P in the waste steel is less than or equal to 0.14%, the mass percentage of S in the waste steel is less than or equal to 0.040%, and the waste steel is strictly added according to the size standard specified by the waste steel (50 x 50mm-600 x 600 mm), so that the influence of a furnace mouth on the production rhythm is prevented;
b. converter converting
The molten iron prepared in the step a is sent into a converter in a one-tank-to-bottom mode, the prepared scrap steel is also added into the converter for blowing, the temperature of the finally prepared molten steel is more than or equal to 1640 ℃, the C content in the tapped molten steel is 0.04-0.05%, the S content is less than or equal to 0.020% and the P content is less than or equal to 0.020%;
c. refining at argon station
After smelting, molten steel in the converter is sent into a ladle to finish the tapping process, sinter white steel is added (no deoxidizer or alloy is added) to treat during tapping, meanwhile, the temperature is increased by 10-20 ℃ on the basis of the step b, sinter, lime and refining slag are added along with the steel flow, (the addition amount of the sinter is 300-500kg, the addition amount of the lime is 300-400kg and the addition amount of the refining slag is 200-400kg in every 100t of molten steel), and CO gas produced by the reaction of iron oxide in the sinter and carbon in the molten steel overflows through the molten steel fluidity impact in the tapping process.
After molten steel is discharged, the buggy ladle enters an argon station, and is subjected to large argon stirring to perform precipitation deoxidation, namely steel core aluminum is used for deoxidation and medium carbon ferromanganese is used for alloying (the addition amount of ferromanganese in every 100t molten steel is 160-180kg, and the addition amount of steel core aluminum is 150-210 kg).
After the oxygen content in the molten steel is controlled in place, slag forming operation is carried out, that is, diffusion deoxidizer aluminum powder is added to deoxidize the steel slag (the aim is to reduce the calcium burning loss when the calcium is taken out by the subsequent calcium treatment, if the oxygen content in the slag is high, the calcium is reacted in the slag layer, the molten steel cannot be entered, the calcium treatment effect cannot be achieved), and the success of slag modification is proved when the top slag turns into yellowish white.
Then calcium treatment, argon blowing, steel ladle sedation and tundish slag discharging are carried out.
The top slag recovery treatment means that the residual steel slag subjected to the top slag treatment in each ladle is poured into the next ladle;
the calcium treatment is to feed Ca-Si wire into molten steel, so as to deeply deoxidize and reduce metal oxide in the steel, reduce oxide in the steel, convert Al2O3 high-melting point impurities in the steel into low-melting point composite oxide through the calcium treatment, change high-melting point cluster Al2O3 into low-melting point spherical calcium aluminate (such as 12 CaO.7Al2O3) so as to improve the fluidity of the molten steel, facilitate the removal of polymerization growth from the molten steel, prevent water gap freezing and reduce the amount of oxide impurities in the steel; meanwhile, the inclusions remained in the steel are almost round and distributed in the steel irregularly, so that the damage to the performance of the steel can be reduced; the flocculation flow refers to the situation that Al2O3 crystallization blocks a tundish nozzle, so that molten steel is not flowed out, and mainly after calcium treatment is not in place, al2O3 is not denatured into 12CaO.7Al2O3, and the rest Al2O3 is blocked.
Argon blowing means that an air supply element is arranged at the bottom of the steel ladle, and argon is blown into molten steel from a pipeline through the air supply element at the bottom, so that the temperature and the components of the molten steel in the steel ladle are uniform, the desulfurization efficiency is improved, and nonmetallic inclusion in the molten steel is promoted to float upwards;
the steel ladle sedation refers to that after argon blowing is finished, the steel ladle is hung on a rotary table of a continuous casting ladle to wait for casting, the waiting time is the sedation time of molten steel, and the sedation time is more than zero and less than or equal to 10 minutes, and the steel ladle sedation is used for enabling inclusions in the molten steel to further float upwards and be attached to a slag layer on the molten steel;
slag discharge means that slag in the tundish is discharged through a back slag discharge port at the back of the tundish so as to avoid great influence on the service life of the refractory in the tundish, the liquid level monitoring of the tundish, the quality of molten steel and the like; because the top slag is not refined and heated, in order to prevent the temperature reduction range in the ladle from being too large, the recovery amount of the top slag needs to be controlled to be within the capacity of the height range of 200-300mm of the ladle, namely the height of the top slag piled in the ladle is 200-300mm;
argon blowing stirring can increase steel-slag interface and mass and heat transfer speed, strengthen steel slag reaction, improve desulfurization speed, reduce dissolved oxygen, promote inclusion floating up, and achieve the technical effect of improving molten steel quality;
d. continuous casting
And carrying out continuous casting processing on refined molten steel to obtain a continuous casting blank, and carrying out tundish electromagnetic stirring treatment during continuous casting, wherein the tundish electromagnetic stirring treatment is to strengthen the movement of molten steel in a liquid phase cavity by virtue of electromagnetic force induced in the liquid phase cavity of the casting blank, strengthen the processes of convection, heat transfer and mass transfer of the molten steel, and thus control the solidification process of the casting blank. The middle ladle is operated in a high liquid level stable pulling speed operation mode, and slag discharging operation is performed on excessive accumulated slag in the middle ladle in time.
After continuous casting, the circulating slag is directly poured into a ladle of a refining ladle lifting position, and the steel slag and the molten steel which remain in the ladle after molten steel casting are characterized by high alkalinity, low oxidability and low melting point, and further have higher sensible heat, so that the production cost can be obviously reduced, the product quality can be ensured, the environment is protected, and the resource consumption can be reduced.
2. Experimental data
(one) the contents of the components of the argon stations of different batches produced by the process of the present invention are shown in Table 1 below:
TABLE 1 content of ingredients in molten Steel after passing through LF refining furnace and RH degassing furnace
ALT in Table 1 represents the total aluminum content in steel, ALS represents the acid-soluble aluminum content in steel, and each component content in ladle top slag corresponding to each sample refined molten steel in Table 1 is shown in Table 2 below:
TABLE 2 content of ingredients in ladle top slag
As can be seen from the data in table 2 above, the slag-tapping technique of the process fully meets the slag-tapping requirements of the SPHD steel grade, and the slag has a strong adsorption capacity.
(II) melting analysis
During the casting process of the molten steel in the 50 furnaces, sample ingots are taken, prepared into samples and subjected to chemical analysis, and the mass percentages of the chemical components are shown in the following table 3:
TABLE 3 mass percent of each chemical component
From the data in Table 3, it can be seen that the product produced by the process of the present invention fully meets the composition requirements of high quality SPHD steel.
TABLE 4 content of ingredients in ladle Top slag by LF refining furnace and RH degassing furnace
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As can be seen from the above tables 2 and 4, the average value of the contents of each component in the slag sample of the argon station after the furnace is very similar to the contents of each component in the slag of the ladle top slag made by the LF refining furnace and the RH degassing furnace, so the slag prepared by the process meets the slag requirement of the SPHD steel grade, and the slag has stronger adsorption capacity.
(IV) comparing the performance of the steel grade produced by the process with that of the steel grade subjected to the refining furnace:
the performance and the area shrinkage are consistent, and the requirements are compounded.
(V) comparing the production with the flocculation flow of the over-refined steel grade by adopting the process:
basically no molten steel flocculation flows, meets the production requirement, and can not cause molten steel to be poured off due to the flocculation flows.
(VI) because the prices of the purchased auxiliary materials are different in each factory, the production cost is compared with the production cost after the new process of the invention is adopted, and the cost per ton of steel is taken as an example, and the costs are shown in the following table 6:
TABLE 6 comparison of original production costs and New Process production costs
As shown in the table 6, the cost per ton of steel can be reduced by 27.10 yuan by adopting the novel process, and the whole smelting period per ton of steel can be shortened by 24 minutes.
In conclusion, the invention shortens the technological treatment process on the basis of completing the high-quality steel, can reduce the energy medium consumption and the cost, and the indexes of the finally obtained product are easy to control.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A method for producing SPHD in a low cost, short process, said process comprising the steps of:
a. preparing molten iron and scrap steel
Producing molten iron by using a blast furnace, wherein the temperature of the finally obtained molten iron is more than or equal to 1280 ℃, the slag content of the molten iron is less than or equal to 2cm, the C content in the molten iron is 4.2-5.1%, the Mn content is 0.2-0.5%, the S content is less than or equal to 0.03%, the P content is less than or equal to 0.130%, the Si content is 0.25-0.55%, preparing scrap steel for standby, and the mass ratio of the scrap steel to the molten iron is 1: (3-5);
b. converter converting
The molten iron prepared in the step a is sent into a converter in a one-tank-to-bottom mode, the prepared scrap steel is also added into the converter for blowing, the temperature of the finally prepared molten steel is more than or equal to 1640 ℃, the C content in the tapped molten steel is 0.04-0.05%, the S content is less than or equal to 0.020% and the P content is less than or equal to 0.020%;
c. external refining
B, after smelting, feeding molten steel in a converter into a ladle to finish a tapping process, carrying out white steel discharge decarburization treatment during tapping, simultaneously increasing the temperature by 13-20 ℃ on the basis of the step b, adding sinter, lime and refined slag along with a steel flow, then carrying out deoxidation and alloying at an argon station, modifying top slag, carrying out calcium treatment, argon blowing, top slag recovery treatment, ladle sedation, ladle protection pouring and tundish slag discharge, and finally obtaining refined molten steel by electromagnetic stirring of a crystallizer;
d. continuous casting
And (5) protecting pouring by a large ladle, deslagging by a middle ladle, and electromagnetic stirring by a crystallizer to obtain qualified continuous casting blanks. .
2. The method for producing SPHD in a low cost, short process according to claim 1, wherein: the top slag recovery treatment in the step c means that the residual slag subjected to the top slag treatment in each ladle is poured into the next ladle.
3. The method for producing SPHD in a low cost, short process according to claim 1, wherein: in the step c, the top slag modification means that deoxidizer aluminum powder is added into the steel slag to produce the reducing top slag, so that the oxidation amount of the calcium treatment calcium line on the slag layer is prevented from being large.
4. The method for producing SPHD in a low cost, short process according to claim 1, wherein: the calcium treatment in the step c means that Ca-Si wires are fed into molten steel, and the argon blowing in the step c means that an air supply element is arranged at the bottom of a steel ladle, and the argon is blown into the molten steel from a pipeline through the air supply element at the bottom.
5. The method for producing SPHD in a low cost, short process according to claim 1, wherein: and c, ladle sedation refers to suspending the ladle to a continuous casting ladle turret to wait for casting after argon blowing is finished, wherein the waiting time is the molten steel sedation time, and the sedation time is more than zero and less than or equal to 10min.
6. The method for producing SPHD in a low cost, short process according to claim 1, wherein: the ladle protection casting in the step c means that the ladle long nozzle is sealed by argon and a sealing ring is used for preventing molten steel from oxidizing, and the tundish slag discharging in the step c means that slag in the tundish is discharged from the ladle to the slag in the tundish through a slag discharging port at the back of the tundish.
7. The method for producing SPHD in a low cost, short process according to claim 1, wherein: the deoxidation treatment in step c is to first perform precipitation deoxidation and then diffusion deoxidation.
8. The method for producing SPHD in a low cost, short process according to claim 1, wherein: in the step c, the adding amount of the sintering ore in every 100t of molten steel is 300-500kg, the adding amount of the lime is 300-400kg, and the adding amount of the refining slag is 200-400kg.
9. The method for producing SPHD in a low cost, short process according to claim 7, wherein: in the step c, the metal deoxidizer is medium-carbon ferromanganese and steel core aluminum or medium-carbon ferromanganese and steel core aluminum, wherein the adding amount of the medium-carbon ferromanganese in every 100t molten steel is 160-180kg, and the adding amount of the steel core aluminum is 150-210kg.
10. The method for producing SPHD in a low cost, short process according to claim 1, wherein: and d, carrying out tundish electromagnetic stirring treatment during continuous casting in the step, wherein the tundish electromagnetic stirring treatment refers to strengthening the movement of molten steel in a liquid phase cavity by means of electromagnetic force induced in the liquid phase cavity of a casting blank, and strengthening the convection, heat transfer and mass transfer processes of the molten steel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311015782.1A CN117363952A (en) | 2023-08-14 | 2023-08-14 | Method for producing SPHD (specific surface Mount device) in low cost and short process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311015782.1A CN117363952A (en) | 2023-08-14 | 2023-08-14 | Method for producing SPHD (specific surface Mount device) in low cost and short process |
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