CN116751931A - Intelligent determination method and system for temperature measurement and oxygen determination time of ultra-low carbon steel in RH refining process - Google Patents
Intelligent determination method and system for temperature measurement and oxygen determination time of ultra-low carbon steel in RH refining process Download PDFInfo
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 336
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 336
- 239000001301 oxygen Substances 0.000 title claims abstract description 336
- 238000009529 body temperature measurement Methods 0.000 title claims abstract description 151
- 238000000034 method Methods 0.000 title claims abstract description 77
- 230000008569 process Effects 0.000 title claims abstract description 52
- 229910001209 Low-carbon steel Inorganic materials 0.000 title claims abstract description 43
- 238000007670 refining Methods 0.000 title claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 120
- 239000010959 steel Substances 0.000 claims abstract description 120
- 238000005261 decarburization Methods 0.000 claims abstract description 82
- 230000009469 supplementation Effects 0.000 claims abstract description 15
- 238000003723 Smelting Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 52
- 238000007664 blowing Methods 0.000 claims description 38
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 34
- 229910052782 aluminium Inorganic materials 0.000 claims description 29
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 29
- 238000001816 cooling Methods 0.000 claims description 24
- 238000005259 measurement Methods 0.000 claims description 18
- 229910045601 alloy Inorganic materials 0.000 claims description 14
- 239000000956 alloy Substances 0.000 claims description 14
- 238000012545 processing Methods 0.000 claims description 13
- 229910052799 carbon Inorganic materials 0.000 claims description 12
- 238000009825 accumulation Methods 0.000 claims description 10
- 238000005275 alloying Methods 0.000 claims description 10
- 230000001502 supplementing effect Effects 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000000265 homogenisation Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims description 2
- 238000005336 cracking Methods 0.000 claims 1
- 241001417490 Sillaginidae Species 0.000 abstract 1
- 238000005086 pumping Methods 0.000 description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000005272 metallurgy Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000012535 impurity Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 238000004861 thermometry Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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Classifications
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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
- C21C7/10—Handling in a vacuum
-
- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G06F30/00—Computer-aided design [CAD]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
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- 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
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Abstract
The invention discloses an intelligent determination method for temperature measurement and oxygen determination time of ultra-low carbon steel in an RH refining process, which specifically comprises the following steps: (1) In the RH treatment process of molten steel, sequentially determining temperature measurement and oxygen determination time of molten steel at the time of entering a station, in the decarburization process, before decarburization, after oxygen supplementation before decarburization, after deoxidization and before RH cavitation; (2) And sending out a temperature measurement and oxygen determination prompt after the temperature measurement and oxygen determination time is reached. The invention provides a method for determining the temperature and oxygen measuring time of smelting ultra-low carbon steel in an RH refining furnace, which quantitatively determines the temperature and oxygen measuring time when the RH smelts the ultra-low carbon steel, improves the site standardized operation level, and improves the control accuracy of the temperature and the components of the molten steel.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to an intelligent determination method and system for temperature measurement and oxygen determination time of ultra-low carbon steel in an RH refining process.
Background
The RH refining furnace is high-efficiency refining equipment, has various refining functions of decarburization, degassing, uniform composition, temperature adjustment, inclusion removal and the like, and plays an extremely important role in ultra-low carbon steel production. When the RH refining furnace is used for smelting ultra-low carbon steel, the decarburization period, the deoxidization period, the alloying period and the clean molten steel circulation period are sequentially divided according to the time course. The main purpose of the decarburization period is to decarburize and control the oxygen content and the molten steel temperature of the molten steel before the decarburization is finished, and the control means is to add carbon powder, cool cold charge, blow oxygen and the like, wherein the decarburization period is a main time window for controlling the oxygen content and the molten steel temperature of the molten steel before the decarburization is finished; the deoxidizing period is to add aluminum-containing material into molten steel to remove excessive oxygen in molten steel and to compensate temperature synchronously; the main purpose of the alloying period is to adjust the chemical composition of molten steel; the clean cycle period of molten steel aims at homogenizing the temperature and the components of molten steel and removing impurities.
When the RH refining furnace is used for smelting ultra-low carbon steel, the temperature of molten steel and the oxygen content are important technical parameters, the temperature of the molten steel is required to meet the requirements of continuous casting for smooth casting, production quality accidents such as steel leakage, casting blank bulging and the like are easily caused due to the fact that the temperature is too high, blank stagnation is easily caused due to the fact that the temperature is too low, and chemical heating operation cannot be performed in the later stage of RH treatment for guaranteeing the cleanliness of the continuous casting blank. The oxygen content of molten steel needs to ensure the decarburization requirement of ultra-low carbon steel, and when the temperature is insufficient, the exothermic compensation temperature of the oxygen content and aluminum reaction needs to be reserved. Thus, the method is applicable to a variety of applications. During the RH process, the change in both the molten steel temperature and the oxygen content must be closely monitored. The temperature and oxygen content of molten steel are measured by a temperature measuring and oxygen determining instrument system. In the RH smelting process, a temperature measuring oxygen lance attached to a temperature measuring oxygen determining instrument system is inserted into molten steel for a plurality of times by a manual or temperature measuring robot, the temperature and the oxygen content of the molten steel are synchronously measured, and the subsequent operation is timely adjusted according to the measurement result: blowing oxygen through the RH top lance when the oxygen content of the molten steel is insufficient for decarburization; when the oxygen content of the molten steel is greater than the demand of decarburization and excess oxygen, adding aluminum particles or a carburant for pre-deoxidization; when the temperature of the molten steel is insufficient, oxygen is blown and the temperature of the molten steel is compensated by the subsequent aluminum addition; when the temperature of the molten steel is high, the cooling operation is performed by the cooling material. And because the temperature measuring probe also has an aluminum fixing function, the adding amount of the aluminum-containing material is determined according to an aluminum fixing result. Clearly, the specific time node at which the temperature and oxygen are measured is very important.
Technological paper "technological improvement of RH development of cold-rolled ultra-low carbon steel" (China metallurgy, 7 th 2010, P36) refers to temperature measurement and oxygen determination timing of RH smelting ultra-low carbon steel: and when the mass fraction of the carbon monoxide detected by the waste gas analyzer is reduced to 20%, measuring the temperature and determining the oxygen to obtain an ultra-low carbon sample, and when the mass fraction of the carbon monoxide detected by the waste gas analyzer is reduced to 10%, measuring the temperature and determining the oxygen, calculating the aluminum adding amount according to the oxygen determining value, deoxidizing the molten steel and controlling the aluminum to a target value. The main idea is to determine the timing of temperature measurement and oxygen determination according to the CO content of the exhaust gas analyzed by a mass spectrometer in an RH exhaust gas pipeline. The problems are: only the decarburization end temperature measurement and oxygen determination time is mentioned, and in the actual RH ultra-low carbon steel smelting process, the temperature and oxygen content of molten steel are required to be measured for a plurality of times so as to adjust the subsequent operation; in addition, expensive mass spectrometers are required, and a plurality of steel plants are not provided.
Disclosure of Invention
The invention provides an intelligent determination method for temperature measurement and oxygen determination time of ultra-low carbon steel in an RH refining process, which is used for automatically determining the temperature measurement and oxygen determination time in the whole period of RH treatment.
The invention discloses an intelligent determination method for temperature measurement and oxygen determination time of ultra-low carbon steel in an RH refining process, which is characterized by comprising the following steps of:
(1) In the RH treatment process of molten steel, sequentially determining temperature measurement and oxygen determination time of molten steel at the time of entering a station, in the decarburization process, before decarburization, after oxygen supplementation before decarburization, after deoxidization and before RH cavitation;
(2) And sending out a temperature measurement and oxygen determination prompt after the temperature measurement and oxygen determination time is reached.
Further, the temperature measurement and oxygen determination time during the entering is as follows:
after molten steel enters an RH processing station, jacking is started, and when the lifting height of the steel ladle platform roof meets the on-site temperature measurement height, the steel ladle platform trolley is stopped to be jacked, and then temperature measurement and oxygen determination are carried out.
Further, the temperature measurement and oxygen determination time in the decarburization process is as follows:
if no deoxidized carbon powder, no oxygen blowing or no cold charge is added according to the temperature measurement and oxygen determination result when the molten steel enters the station, the temperature measurement and oxygen determination are carried out after a set time length I from the moment of starting vacuumizing RH;
if at least one operation of adding deoxidized carbon powder, blowing oxygen and adding cold charge is needed according to the temperature measurement and oxygen determination result when the molten steel enters the station, the temperature measurement and oxygen determination are carried out after the following conditions are met:
condition (1): setting a time length II after the last operation is completed;
condition (2): setting a time length I from RH to the moment of starting vacuumizing;
the set duration I is the duration required by stable temperature drop and sufficient oxygen evolution of the ladle and the vacuum tank, and the set duration II is the duration required by chemical reaction and uniform mixing of molten steel adding substances and molten steel.
Further, the temperature measurement and oxygen determination time before the decarburization is finished is as follows:
if any one of deoxidized carbon powder, oxygen blowing and cooling material is needed to be added according to the temperature measurement and oxygen determination result in the decarburization process, the temperature measurement and oxygen determination are carried out after the following conditions are met:
condition (1): setting a time length II after the last operation is completed;
condition (2): the high vacuum accumulation time is more than or equal to A minutes, wherein A is set based on the air extraction capacity of a vacuum pump, the molten steel amount and the target value of the RH treatment ending carbon content;
if the oxygen measurement result is measured according to the decarburization process, deoxidized carbon powder, oxygen blowing and cooling materials are not needed, the oxygen measurement is performed after the high vacuum accumulation time is more than or equal to A minutes.
Further, the temperature measurement and oxygen determination time after oxygen supplementation before decarburization is finished is as follows:
judging whether oxygen supplementation is needed according to the temperature measurement and oxygen determination result before the decarburization is finished, and if oxygen supplementation is needed, measuring the temperature and oxygen after a set period of time II after oxygen blowing is finished.
Further, the method for detecting whether oxygen supplementation is needed before decarburization is finished is specifically as follows:
(1) If the oxygen content obtained by measuring the temperature and determining the oxygen before the decarburization is finished is less than the target oxygen content for the decarburization, oxygen supplementing is needed before the decarburization is finished;
(2) And calculating whether oxygen blowing compensation temperature before decarburization is needed or not according to the temperature measurement and oxygen determination result before decarburization is finished, and if the temperature measurement and oxygen determination before decarburization is finished, the molten steel temperature is plus the molten steel oxygen content before decarburization is plus the temperature measurement and oxygen determination time before decarburization is 25-the molten steel natural temperature drop-alloying alloy temperature drop of molten steel from the temperature measurement and oxygen determination time before decarburization to the RH emptying time is less than the RH emptying target temperature, oxygen supplementing is needed before decarburization is finished.
Further, the temperature measurement and oxygen determination time after the deoxidation is finished is as follows:
and (3) measuring temperature and oxygen at a set time period III after the aluminum-containing material is added, wherein the set time period III is the reaction and homogenization time period of the aluminum-containing material.
Further, the prompt temperature measurement and oxygen determination time before RH breaking is as follows:
performing secondary temperature measurement and oxygen determination in a set time length IV after adding alloy in the alloying process;
the set time length IV is set based on the net cycle time length, and temperature measurement and oxygen determination are carried out before RH breaking.
The invention is realized in such a way that an intelligent temperature-measuring and oxygen-determining timing determining system for ultra-low carbon steel in the RH refining process comprises: the output end of the temperature measuring and oxygen determining instrument is connected with the input end of the control unit, and the output end of the control unit is connected with the input end of the prompting unit;
after the carbon powder, oxygen, cold materials, aluminum-containing materials and alloys are added, the control unit reads related signals, calculates temperature and oxygen measuring time of the ultra-low carbon steel molten steel after oxygen supplement, deoxidization and RH emptying before entering a station, decarburization and decarburization are finished, and after the smelting time reaches the calculated temperature and oxygen measuring time, the control prompt unit sends out a temperature and oxygen measuring prompt, and the temperature and oxygen measuring instrument tests the temperature and oxygen according to prompt and uploads the temperature and oxygen measuring result to the control unit.
Further, the system further comprises:
the input end of the control unit is connected with the output end of the input unit;
the temperature measuring and oxygen determining instrument uploads the temperature measuring and oxygen determining result to the control unit, and the control unit displays the result through the display unit;
the input unit receives the input temperature-measuring and oxygen-determining instruction, and the control unit controls the prompting unit to send out a temperature-measuring and oxygen-determining prompt so that an operator can measure temperature and determine oxygen again.
The invention provides an intelligent determination method for temperature measurement and oxygen determination time when an RH refining furnace is used for smelting ultra-low carbon steel. By adopting the method, the temperature measurement and oxygen determination time in the RH ultra-low carbon steel smelting process can be quantitatively determined, the site standardized operation level is improved, the molten steel temperature and component control accuracy are improved, the RH air-break temperature standard reaching rate is 98.5%, and the molten steel carbon content internal control qualification rate is 99.2%.
Drawings
FIG. 1 is a flow chart of an intelligent determination method for temperature measurement and oxygen determination time of ultra-low carbon steel in an RH refining process, which is provided by the embodiment of the invention;
FIG. 2 is a schematic structural diagram of an intelligent temperature and oxygen measurement timing determination system for ultra-low carbon steel in an RH refining process according to an embodiment of the present invention;
FIG. 3 is an interface diagram of a temperature and oxygen measuring system for an RH refining process of ultra-low carbon steel provided by an embodiment of the invention.
Detailed Description
The following detailed description of the embodiments of the invention, given by way of example only, is presented in the accompanying drawings to aid in a more complete, accurate, and thorough understanding of the inventive concepts and aspects of the invention by those skilled in the art.
The chemical compositions of the ultralow-carbon steel are shown in the following table, and the balance is iron and impurities.
In order to control the carbon content of the molten steel to meet the requirement, the decarburization is finished to the target oxygen content: 100-800ppm.
Fig. 1 is a flow chart of a temperature measurement and oxygen determination method for a low-carbon steel in an RH refining process according to an embodiment of the present invention, where the method specifically includes the following steps:
(1) Temperature measurement and oxygen determination at the time of approach
After molten steel enters an RH processing station, jacking is started, when the lifting height of the steel ladle table roof meets the on-site temperature measurement height (for example, 1500 mm), jacking of the steel ladle table is stopped, first temperature measurement and oxygen determination are carried out (namely, molten steel temperature and oxygen content are measured), and whether deoxidized carbon powder, oxygen blowing (used for compensating molten steel temperature or decarburization) and cooling material (used for cooling) are added or not is calculated according to parameters such as a first temperature measurement and oxygen determination result, decarburization ending carbon content, RH emptying temperature and the like.
(2) Temperature measurement and oxygen determination in decarburization process
RH starts vacuumizing, decarburization treatment is performed on molten steel, if deoxidized carbon powder, oxygen blowing and cooling materials are not added according to the temperature measurement and oxygen determination result in the start of the station, the second temperature measurement and oxygen determination are performed after a set time length I from the moment of starting vacuumizing of RH, wherein the set time length I is set to be the time length required by stable temperature drop and sufficient oxygen evolution of the ladle and the vacuum tank, for example, 4-6 minutes;
after RH starts vacuumizing, decarburizing molten steel, if any one of deoxidized carbon powder, oxygen blowing and cooling material is needed according to the temperature measuring and oxygen determining result in the process of entering, performing second temperature measuring and oxygen determining after the following conditions are met:
condition (1): setting a time length II after the last operation is completed;
condition (2): setting a time length I from RH to the moment of starting vacuumizing;
the set duration II is the duration required by chemical reaction and uniform mixing of molten steel adding substances and molten steel, for example, 2 minutes, and whether deoxidized carbon powder, oxygen blowing and cooling materials are added before decarburization is finished is determined according to the second temperature measurement and oxygen determination result.
Because the temperature drop speed of the ladle and the vacuum tank in the earlier stage fluctuates greatly, and the oxygen transmission amount of the vacuum tank to molten steel is unstable, if the second temperature measurement and the oxygen determination are too early, the influence of the ladle and the vacuum tank state on the temperature and the oxygen content of the molten steel is not eliminated yet. After 4-6 minutes from the RH start time, the influence of the self state of the ladle and the vacuum tank on the temperature and the oxygen content of molten steel is basically eliminated, and the temperature drop of the molten steel is basically stable, and the ladle and the vacuum tank do not separate oxygen from the molten steel, so that the temperature and the oxygen content measured after 4-6 minutes from the RH start time have strong guiding effect on the subsequent operation. The reason why the temperature measurement and oxygen determination are performed after the time of the last operation is delayed by 2 minutes is that after carbon powder, oxygen blowing or cooling is performed, the added materials and molten steel have a certain reaction time, if the temperature measurement and oxygen determination operation is performed immediately after the operation is completed, the measured result has deviation, and the subsequent operation can be misled;
(3) Temperature measurement and oxygen determination before decarburization are finished;
if any one of deoxidized carbon powder, oxygen blowing and refrigerating materials is needed to be added according to the temperature measurement and oxygen determination result in the decarburization process, the third temperature measurement and oxygen determination are carried out after the following conditions are met:
condition (1): setting a time length II after the last operation is completed;
condition (2): the accumulation time of high vacuum (the vacuum degree is less than or equal to 200 pa) is more than or equal to A minutes, wherein A is related to the target value of the pumping capacity of a vacuum pump, the molten steel amount and the carbon content after RH treatment.
If deoxidized carbon powder, oxygen blowing and cooling materials are not needed according to the temperature measurement and oxygen determination result in the decarburization process, the third temperature measurement and oxygen determination are carried out after the accumulation time of high vacuum (the vacuum degree is less than or equal to 200 pa) is more than or equal to A minutes.
Based on the third temperature measurement and oxygen determination result, whether oxygen supplementation is needed before decarburization is finished is detected, and the detection method specifically comprises the following steps:
(1) If the oxygen content of the third temperature measurement oxygen is less than the decarburization ending target oxygen content, oxygen supplementing, namely oxygen blowing, is needed before the decarburization is ended, the purpose is to ensure that the decarburization ending oxygen content meets the requirement, and finally, the purpose is to ensure that the RH carbon content is qualified.
(2) According to the third temperature measurement and oxygen determination result, whether oxygen blowing compensation temperature is needed before decarburization is finished is calculated, if: when the temperature of the molten steel with the third temperature measurement and oxygen determination and the oxygen content of the molten steel with the third temperature measurement and oxygen determination/25-the natural temperature drop of the molten steel from the third temperature measurement and oxygen determination time to the RH emptying time and the alloying alloy temperature drop is less than the RH emptying target temperature, oxygen supplementation, namely oxygen blowing, is needed before decarburization is finished, and the aim is to ensure that the molten steel temperature at the RH emptying time reaches the target temperature. Wherein 25 is the deoxidization heating constant, namely: oxygen content (ppm) required for each temperature rise of molten steel at 1 ℃.
(4) Temperature measurement and oxygen determination after oxygen supplementation before decarburization
And (3) performing fourth temperature measurement and oxygen determination according to the temperature measurement and oxygen determination result before the decarburization is finished, wherein the set time length II after the oxygen blowing is finished, and if the oxygen supplement is not required before the decarburization is finished, the fourth temperature measurement and oxygen determination are not required. And calculating the addition amount of the aluminum-containing material according to the oxygen content of the oxygen measured by the third temperature measurement or the fourth temperature measurement and the target Als. (5) Temperature measurement and oxygen determination after deoxidation is finished
And carrying out fifth temperature measurement and oxygen determination on a set time length III after the aluminum-containing material is added, and detecting the Als content in the molten steel, wherein the set time length III is the reaction and homogenization time of adding the aluminum-containing material. If the temperature measurement and oxygen determination node is too early, the measured oxygen content is inaccurate and not representative, the subsequent operation can be misled, and if the temperature measurement and oxygen determination node is too late, the RH processing time can be prolonged.
The purpose of the oxygen determination is to indirectly obtain the Als content of the molten steel through the oxygen determination, and if the Als content is lower than the target Als, an aluminum-containing material needs to be added during alloying.
(6) Temperature measurement and oxygen determination before RH breaking
And (3) carrying out sixth temperature measurement and oxygen determination in a set time length IV after adding alloy or aluminum-containing materials in the alloying process. The set duration IV is set based on the requirement of the net circulation duration, a certain net circulation time is ensured to be broken, RH processing is finished, the net circulation time required by each steel grade is regulated in an operation file, the net circulation time is related to the grade of the steel grade, and the purpose of setting the lower limit of the net circulation time is to ensure the effect of removing the inclusions of molten steel and improve the purity of the molten steel. Because the temperature and oxygen measurement operation needs a certain preparation time (about 1 minute), if the temperature and oxygen measurement is performed until the net circulation time reaches the required net circulation time, the RH processing time is prolonged, and therefore the set time length IV is designed and is smaller than the net circulation time required by the operation instruction. The set duration IV may be set to 5 minutes, assuming that the net cycle time requirement is greater than or equal to 6 minutes.
Fig. 2 is a schematic structural diagram of a temperature-measuring and oxygen-determining system for a low-carbon steel refining process according to an embodiment of the present invention, and for convenience of explanation, only a portion related to the embodiment of the present invention is shown, where the system includes:
the temperature measuring and oxygen determining instrument is used for measuring temperature and oxygen, the output end of the temperature measuring and oxygen determining instrument is connected with the input end of the control unit, the output end of the control unit is connected with the input end of the prompting unit, and the prompting unit is arranged in the control room;
after the carbon powder, oxygen, cold materials and alloyed aluminum-containing materials are added, the control unit reads related signals, calculates temperature and oxygen measuring time of low-carbon steel molten steel after oxygen supplementing, deoxidizing and RH breaking before entering a station, before decarburization and before decarburization are finished in the decarburization process and before RH refining process based on the temperature and oxygen measuring method of the low-carbon steel in the RH refining process, and after the smelting time reaches the temperature and oxygen measuring time, the control prompt unit sends out a temperature and oxygen measuring prompt, an operator or a temperature and oxygen measuring sampling robot carries out temperature and oxygen measuring based on the temperature and oxygen measuring prompt, and the temperature and oxygen measuring instrument uploads a temperature and oxygen measuring result to the control unit.
In an embodiment of the present invention, the system further includes:
the input end of the control unit is connected with the output end of the input unit;
after the temperature measuring and oxygen determining instrument uploads the temperature measuring and oxygen determining result to the control unit, the control unit displays the result through the display unit; if the current temperature and oxygen measurement result is abnormal, the temperature and oxygen measurement instruction can be input through the input unit, and after the input unit receives the manually input temperature and oxygen measurement instruction, the control unit controls the secondary prompt unit to send out the temperature and oxygen measurement prompt, so that an operator can perform temperature and oxygen measurement operation again.
In order to further illustrate the concept of the invention, the invention is further described below by taking a 300TRH refining furnace for smelting ultra-low carbon steel as an example.
Example 1: ultra low carbon steel, brand: automobile panel DC04. The chemical composition of the mentioned ultra-low carbon steel is shown in the following table, and the balance is iron and impurities.
The target oxygen for decarburization of the steel grade is 300ppm, the target temperature for breaking the blank is 1580 ℃,
the primary molten steel smelted by the converter enters an RH furnace treatment position, and the carbon content of the molten steel is as follows when RH enters a station: 415ppm;
determination of first temperature measurement and oxygen determination time: after molten steel enters an RH processing station, jacking is started, when the lifting height of the steel ladle table roof meets the condition of on-site temperature measurement, the jacking of the steel ladle table trolley is stopped, the first temperature measurement and oxygen determination are carried out, and the measured molten steel temperature T is obtained 1 ：1642℃，[O] 1 :627ppm, according to the general knowledge of metallurgy, it was found that oxygen blowing of 115Nm was required during decarburization 3 1200kg of cold material is added without deoxidizingCarbon powder. After RH vacuum pumping, 115Nm of oxygen is blown in sequence 3 1200kg of cooling cold material is added, and the ending time of the cooling cold material is 5 minutes after the starting time of the treatment;
determination of the second temperature measurement and oxygen determination time: the oxygen blowing and cooling cold material operation is performed according to the 1 st temperature measurement and oxygen determination, and the final cooling cold material operation end time is 5 minutes after the processing start time, so that the operation end time is +2 minutes. That is, the 2 nd temperature measurement and oxygen determination were performed 7 minutes after the start of the treatment. Measured molten steel temperature T 2 ：1610℃，[O] 2 :342ppm, according to the general knowledge of metallurgy, 600kg of cooling material is required to be added. 600kg of cooling cold material is added after the temperature measurement and oxygen determination are carried out for the 2 nd time, and the end time of the cooling cold material is 10 minutes after the treatment starting time;
determination of third temperature measurement and oxygen determination time:
condition 1: according to the second temperature measurement and oxygen determination result, the deoxidized carbon powder is calculated to be unnecessary, so that the condition is considered to be satisfied;
condition 2: the adding time of 600kg of cold charge calculated according to the second temperature measurement and oxygen determination results is 11 minutes from the distance pumping time, so that the condition 2 is satisfied when the distance pumping time is 13 minutes;
condition 3: according to the 2 nd temperature measurement and oxygen determination result, oxygen blowing is not needed, so that the condition is considered to be satisfied;
condition 4: the accumulation time of the high vacuum (the vacuum degree is less than or equal to 200 pa) of the steel grade is more than or equal to 7 minutes, and the carbon content can be considered to meet the RH requirement. In production, the accumulation time of high vacuum (vacuum degree is less than or equal to 200 pa) reaches 7 minutes when the vacuum is opened for 12 minutes, so that the condition is considered to be satisfied when the vacuum is opened for 12 minutes.
By combining the above, when the distance from the start of pumping is 13 minutes, the condition of the third temperature measurement and oxygen determination is satisfied, and the measured molten steel temperature T is determined 3 ：1597℃，[O] 3 ：315ppm。
Fourth time determination of temperature measurement and oxygen determination complement measurement time:
based on the results of the third thermometry and oxygen determination, the third determination of [ O ]] 3 Is 315ppm > decarburization ending target oxygen content (300)ppm), no oxygen blowing operation (oxygen supplementation); because the molten steel temperature measured during the third temperature measurement and oxygen determination is plus the molten steel oxygen content during the third temperature measurement and oxygen determination is 25-the molten steel natural temperature drop-alloying alloy temperature drop from the moment of the third temperature measurement and oxygen determination to the RH break moment is 1597+315/25-17-2=1584 ℃, and the RH break target temperature (1580 ℃), the oxygen blowing operation (oxygen supplementation) is not needed, and the fourth temperature measurement and oxygen determination is not needed.
Determination of the fifth temperature measurement and oxygen determination time: calculating the addition amount of deoxidized and alloyed aluminum-containing material according to the oxygen content obtained by measuring the temperature and oxygen for the third time and the target Als, adding 450kg of aluminum-containing material, wherein the addition end time of 450kg of aluminum-containing material is 16 minutes from the start of pumping, the fifth temperature measurement and oxygen determination are carried out 2 minutes after the addition, namely 18 minutes from the start of pumping, and the measured molten steel temperature T is measured 5 ：1589℃，[O] 5 :2.74ppm, als content: 0.052% without adding aluminum-containing material;
determination of the sixth temperature measurement and oxygen determination time: after the fifth temperature measurement and oxygen determination, adding alloyed alloy, wherein the adding end time of the alloy is 21 minutes away from the pumping time, and after 5 minutes, the sixth temperature measurement and oxygen determination operation is performed at 26 minutes away from the pumping time. Measured molten steel temperature T 6 ：1581℃，[O] 6 ：2.65ppm。
Example 2: ultra low carbon steel, brand: automobile panel MBTP125001. The chemical composition of the mentioned ultra-low carbon steel is shown in the following table, and the balance is iron and impurities.
The target oxygen for decarburization of the steel grade is 250ppm, the target temperature for breaking is 1579 ℃,
the primary molten steel smelted by the converter enters an RH furnace treatment position, and the carbon content of the molten steel is as follows when RH enters a station: 323ppm;
determination of first temperature measurement and oxygen determination time: after molten steel enters an RH processing station, jacking is started, when the lifting height of the steel ladle table roof meets the condition of on-site temperature measurement, the jacking of the steel ladle table trolley is stopped, the first temperature measurement and oxygen determination are carried out, and the measured molten steel temperature T is obtained 1 ：1636℃，[O] 1 :420ppm, according to the general knowledge of metallurgy, the oxygen blowing and the cooling of 568kg of cold material and the deoxidized carbon powder are not needed in the decarburization process. After RH vacuumizing, 568kg of cooling cold material is added, and the finishing time of the cooling cold material is 4.8 minutes after the starting time of the treatment;
determination of the second temperature measurement and oxygen determination time: the temperature and cold material adding and reducing operation is performed according to the first temperature measurement and oxygen determination, and the time of ending the temperature and cold material adding and reducing operation is 4.8 minutes after the time of starting the treatment, so that the time of ending the temperature and cold material adding and reducing operation is +2 minutes. Namely, the 2 nd temperature measurement and oxygen determination were performed 6.8 minutes after the start of the treatment. Measured molten steel temperature T 2 ：1603℃，[O] 2 :161ppm, according to the general knowledge of metallurgy, it is known that 30Nm of oxygen needs to be blown 3 . Oxygen blowing after the 2 nd temperature measurement and oxygen determination of 30Nm 3 The oxygen blowing end time is 9 minutes after the treatment start time;
determination of third temperature measurement and oxygen determination time:
condition 1: according to the second temperature measurement and oxygen determination result, the deoxidized carbon powder is calculated to be unnecessary, so that the condition is considered to be satisfied;
condition 2: according to the second temperature measurement and oxygen determination result, the cooling material is not needed to be heated, so that the condition is considered to be satisfied;
condition 3: according to the second temperature measurement and oxygen determination result, calculating 30Nm of oxygen required to be blown 3 The oxygen blowing end time is 9 minutes after the start processing time, so this condition is considered to be satisfied 11 minutes after the start processing time;
condition 4: the accumulation time of the high vacuum (the vacuum degree is less than or equal to 200 pa) of the steel grade is more than or equal to 7 minutes, and the carbon content can be considered to meet the RH requirement. In production, the accumulation time of high vacuum (vacuum degree is less than or equal to 200 pa) reaches 7 minutes when the vacuum is opened for 12 minutes, so that the condition is considered to be satisfied when the vacuum is opened for 12 minutes.
By combining the above, when the distance from the start of pumping is 12 minutes, the condition of the third temperature measurement and oxygen determination is satisfied, and the measured molten steel temperature T is measured 3 ：1594℃，[O] 3 ：230ppm。
Fourth determination of temperature measurement and oxygen determination time:
based on the results of the third thermometry and oxygen determination, the third determination of [ O ]] 3 230ppm < decarburization end target oxygen content (250 ppm), so that oxygen blowing operation (oxygen supplying) is required; because the molten steel temperature measured during the third temperature measurement and oxygen determination is plus the molten steel oxygen content during the third temperature measurement and oxygen determination is 25-the natural temperature drop of the molten steel from the moment of the third temperature measurement and oxygen determination to the moment of RH breaking and emptying is equal to the alloy temperature drop=1594+230/25-17.8-4= 1581.4 ℃ and is higher than the RH breaking and emptying target temperature (1579 ℃), the oxygen blowing operation (temperature rise) is not needed. After synthesis, oxygen blowing is required according to the result of the third temperature measurement and oxygen determination. The oxygen blowing end time is 14.5 minutes from the start processing time, so the fourth temperature measurement and oxygen determination are performed at the oxygen blowing operation completion time +2 minutes, that is, 16.5 minutes from the start processing time.
Determination of the fifth temperature measurement and oxygen determination time: according to the oxygen content obtained by fourth temperature measurement and oxygen determination and the target Als, calculating the addition amount of deoxidized and alloyed aluminum-containing material, wherein 310kg of aluminum-containing material is required to be added, the addition end time of 310kg of aluminum-containing material is 18 minutes from the start of pumping, the fifth temperature measurement and oxygen determination are carried out 2 minutes after the addition, namely 20 minutes from the start of pumping, and the measured molten steel temperature T is measured 5 ：1594℃，[O] 5 :2.69ppm, als content: 0.050% without adding aluminium-containing material;
determination of the sixth temperature measurement and oxygen determination time: and after the fifth temperature measurement and oxygen determination, adding the alloyed alloy, wherein the adding end time of the alloy is 24 minutes away from the pumping time, and the sixth temperature measurement and oxygen determination operation is performed after 5 minutes, namely 29 minutes away from the pumping time. Measured molten steel temperature T 6 ：1580℃，[O] 6 ：2.71ppm。
While the present invention has been described by way of example, it should be apparent that the practice of the invention is not limited by the foregoing, but rather is intended to cover various insubstantial modifications of the method concepts and teachings of the invention, either as applied to other applications without modification, or as applied directly to other applications, without departing from the scope of the invention.
Claims (10)
1. An intelligent determination method for temperature measurement and oxygen determination time of ultra-low carbon steel in RH refining process is characterized by comprising the following steps:
(1) In the RH treatment process of molten steel, sequentially determining temperature measurement and oxygen determination time of molten steel at the time of entering a station, in the decarburization process, before decarburization, after oxygen supplementation before decarburization, after deoxidization and before RH cavitation;
(2) And sending out a temperature measurement and oxygen determination prompt after the temperature measurement and oxygen determination time is reached.
2. The intelligent determination method for temperature and oxygen measurement time of ultra-low carbon steel in RH refining process according to claim 1, wherein the temperature and oxygen measurement time in the process of entering station is:
after molten steel enters an RH processing station, jacking is started, and when the lifting height of the steel ladle platform roof meets the on-site temperature measurement height, the steel ladle platform trolley is stopped to be jacked, and then temperature measurement and oxygen determination are carried out.
3. The intelligent determination method for temperature measurement and oxygen determination time of ultra-low carbon steel in RH refining process according to claim 1, wherein the temperature measurement and oxygen determination time in decarburization process is as follows:
if no deoxidized carbon powder, no oxygen blowing or no cold charge is added according to the temperature measurement and oxygen determination result when the molten steel enters the station, the temperature measurement and oxygen determination are carried out after a set time length I from the moment of starting vacuumizing RH;
if at least one operation of adding deoxidized carbon powder, blowing oxygen and adding cold charge is needed according to the temperature measurement and oxygen determination result when the molten steel enters the station, the temperature measurement and oxygen determination are carried out after the following conditions are met:
condition (1): setting a time length II after the last operation is completed;
condition (2): setting a time length I from RH to the moment of starting vacuumizing;
the set duration I is the duration required by stable temperature drop and sufficient oxygen evolution of the ladle and the vacuum tank, and the set duration II is the duration required by chemical reaction and uniform mixing of molten steel adding substances and molten steel.
4. The intelligent determination method for temperature measurement and oxygen determination time of ultra-low carbon steel in RH refining process according to claim 1, wherein the temperature measurement and oxygen determination time before decarburization is finished is as follows:
if any one of deoxidized carbon powder, oxygen blowing and cooling material is needed to be added according to the temperature measurement and oxygen determination result in the decarburization process, the temperature measurement and oxygen determination are carried out after the following conditions are met:
condition (1): setting a time length II after the last operation is completed;
condition (2): the high vacuum accumulation time is more than or equal to A minutes, wherein A is set based on the air extraction capacity of a vacuum pump, the molten steel amount and the target value of the RH treatment ending carbon content;
if the oxygen measurement result is measured according to the decarburization process, deoxidized carbon powder, oxygen blowing and cooling materials are not needed, the oxygen measurement is performed after the high vacuum accumulation time is more than or equal to A minutes.
5. The intelligent determination method for temperature measurement and oxygen determination time of ultra-low carbon steel in RH refining process according to claim 1, wherein the temperature measurement and oxygen determination time after oxygen supplementation before decarburization is finished is as follows:
judging whether oxygen supplementation is needed according to the temperature measurement and oxygen determination result before the decarburization is finished, and if oxygen supplementation is needed, measuring the temperature and oxygen after a set period of time II after oxygen blowing is finished.
6. The intelligent determination method for temperature measurement and oxygen determination time of ultra-low carbon steel in RH refining process according to claim 1, wherein the detection method for whether oxygen supplement is needed before decarburization is finished is specifically as follows:
(1) If the oxygen content obtained by measuring the temperature and determining the oxygen before the decarburization is finished is less than the target oxygen content for the decarburization, oxygen supplementing is needed before the decarburization is finished;
(2) And calculating whether oxygen blowing compensation temperature before decarburization is needed or not according to the temperature measurement and oxygen determination result before decarburization is finished, and if the temperature measurement and oxygen determination before decarburization is finished, the molten steel temperature is plus the molten steel oxygen content before decarburization is plus the temperature measurement and oxygen determination time before decarburization is 25-the molten steel natural temperature drop-alloying alloy temperature drop of molten steel from the temperature measurement and oxygen determination time before decarburization to the RH emptying time is less than the RH emptying target temperature, oxygen supplementing is needed before decarburization is finished.
7. The intelligent determination method for temperature measurement and oxygen determination time of ultra-low carbon steel in RH refining process as claimed in claim 1, wherein the temperature measurement and oxygen determination time after deoxidation is finished is as follows:
and (3) measuring temperature and oxygen at a set time period III after the aluminum-containing material is added, wherein the set time period III is the reaction and homogenization time period of the aluminum-containing material.
8. The intelligent determination method for temperature measurement and oxygen determination time of ultra-low carbon steel in RH refining process according to claim 1, wherein the prompt temperature measurement and oxygen determination time before RH cracking is:
performing secondary temperature measurement and oxygen determination in a set time length IV after adding alloy in the alloying process;
the set time length IV is set based on the net cycle time length, and temperature measurement and oxygen determination are carried out before RH breaking.
9. An intelligent temperature and oxygen measurement timing determination system for ultra-low carbon steel in an RH refining process is characterized by comprising: the output end of the temperature measuring and oxygen determining instrument is connected with the input end of the control unit, and the output end of the control unit is connected with the input end of the prompting unit;
after the addition of carbon powder, oxygen, cold materials, aluminum-containing materials and alloys is finished, the control unit reads related signals, calculates the temperature and oxygen measuring time of the ultra-low carbon steel molten steel before entering a station, decarburizing, oxygen supplementing before decarburizing, oxygen supplementing after deoxidizing and oxygen supplementing before RH breaking in the process of decarburizing and before RH refining based on the temperature and oxygen measuring time intelligent determination method of the ultra-low carbon steel in the RH refining process according to claims 2 to 8, and after the smelting time reaches the calculated temperature and oxygen measuring time, the control prompting unit sends out a temperature and oxygen measuring prompt, and the temperature and oxygen measuring instrument uploads the temperature and oxygen measuring result of each time to the control unit.
10. The intelligent determination system for temperature and oxygen measurement timing of ultra-low carbon steel in an RH refining process according to claim 9, wherein the system further comprises:
the input end of the control unit is connected with the output end of the input unit
The temperature measuring and oxygen determining instrument uploads the temperature measuring and oxygen determining result to the control unit, and the control unit displays the result through the display unit;
the input unit receives the input temperature-measuring and oxygen-determining instruction, and the control unit controls the prompting unit to send out a temperature-measuring and oxygen-determining prompt so that an operator can measure temperature and determine oxygen again.
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