CN118086617A - Method for smelting micro-carbon steel by using vanadium-containing semisteel - Google Patents
Method for smelting micro-carbon steel by using vanadium-containing semisteel Download PDFInfo
- Publication number
- CN118086617A CN118086617A CN202410195520.6A CN202410195520A CN118086617A CN 118086617 A CN118086617 A CN 118086617A CN 202410195520 A CN202410195520 A CN 202410195520A CN 118086617 A CN118086617 A CN 118086617A
- Authority
- CN
- China
- Prior art keywords
- content
- steel
- molten steel
- temperature
- carbon
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 66
- 238000003723 Smelting Methods 0.000 title claims abstract description 33
- 229910052720 vanadium Inorganic materials 0.000 title claims abstract description 31
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 229910000975 Carbon steel Inorganic materials 0.000 title claims abstract description 30
- 239000010962 carbon steel Substances 0.000 title claims abstract description 30
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 88
- 239000010959 steel Substances 0.000 claims abstract description 88
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000001301 oxygen Substances 0.000 claims abstract description 37
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 37
- 239000011572 manganese Substances 0.000 claims abstract description 24
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 23
- 238000005275 alloying Methods 0.000 claims abstract description 22
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 20
- 238000005261 decarburization Methods 0.000 claims abstract description 18
- 238000010079 rubber tapping Methods 0.000 claims abstract description 18
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000009749 continuous casting Methods 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000005266 casting Methods 0.000 claims abstract description 12
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 10
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 8
- 239000002893 slag Substances 0.000 claims description 23
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 20
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 11
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 11
- 229910052786 argon Inorganic materials 0.000 claims description 10
- 238000007664 blowing Methods 0.000 claims description 8
- 238000009529 body temperature measurement Methods 0.000 claims description 8
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 claims description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 5
- 206010039897 Sedation Diseases 0.000 claims description 5
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 5
- 239000004571 lime Substances 0.000 claims description 5
- 239000003607 modifier Substances 0.000 claims description 5
- 238000007670 refining Methods 0.000 claims description 5
- 230000036280 sedation Effects 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 4
- 238000000265 homogenisation Methods 0.000 claims description 3
- 239000004615 ingredient Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 24
- 229910052742 iron Inorganic materials 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 229910000655 Killed steel Inorganic materials 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 238000009850 CAS-OB (composition adjustment by sealed argon bubbling with oxygen blowing) Methods 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000009847 ladle furnace Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a method for smelting micro-carbon steel by using vanadium-containing semisteel, and belongs to the field of steel smelting. The method comprises the following steps: placing semi-steel into a converter for primary smelting, and controlling the C content, O content and tapping temperature of molten steel at the primary smelting end point; carrying molten steel from a small platform behind a furnace to an RH furnace for RH light treatment, wherein the target O content is 350-550 ppm, measuring the temperature of the molten steel of a ladle and determining oxygen after decarburization cyclic treatment for 5-6 minutes, carrying out final deoxidation and aluminum alloying according to the oxygen determination value, and then carrying out manganese alloying, wherein the output target O content is controlled below 150 ppm; and lifting the molten steel to a casting machine from a station to perform continuous casting, so as to obtain the micro-carbon steel. The method reduces the temperature fluctuation of RH light treatment, optimizes the decarburization rate of RH working procedures and improves the manufacturing success rate of micro-carbon steel by controlling the carbon content, the temperature and the free oxygen activity in the steel of the converter converting end point steel.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a method for smelting micro-carbon steel by using vanadium-containing semisteel.
Background
Micro-carbon aluminum killed steel (C is less than or equal to 0.09%, al is 0.02% -0.07%, si is less than or equal to 0.03%) is a typical steel grade of a cold-rolled sheet. Widely used in the industries of automobiles, household appliances, buildings and the like. Because the demand of the product is large and the technical difficulty is not large, a plurality of iron and steel companies at home and abroad can produce the product, and the adopted technological processes are different. In a steel mill of a traditional flow, the production process of the micro-carbon aluminum killed steel mainly comprises the following three processes: the first process is molten iron pretreatment, top-bottom combined blown converter, CAS-OB/ANS-OB and continuous casting; the second process is molten iron pretreatment, top-bottom combined blowing converter, argon blowing station and continuous casting; the third process is molten iron pretreatment, top-bottom combined blown converter, LF and continuous casting.
In order to realize the aim of producing high-quality micro-carbon steel with low cost, a process for producing micro-carbon steel by using molten iron pretreatment, a top-bottom combined blown converter, RH and continuous casting is also provided. The RH light treatment is carried out in the RH process, the component and temperature adjustment is carried out under the lower vacuum degree of 4-27 kPa, the carbon deoxidation process is adopted, the consumption of deoxidized aluminum can be obviously saved, and the deoxidized product is obviously reduced due to the adoption of the carbon deoxidation process, thereby being beneficial to improving the cleanliness of molten steel.
However, the process flow has the problems of difficult process temperature control and large initial temperature drop in vacuum carbon deoxidation, and the average temperature of the whole process is reduced by about 35 ℃, so that the whole steelmaking layout is required to be compact, and the flow time is short. The molten iron smelted by taking vanadium titano-magnetite as a raw material is rich in a large amount of vanadium elements, vanadium is removed in the form of vanadium slag after the process of extracting vanadium from the molten iron, and the rest is called as semisteel, so that the original carbon content of a converter is low for extracting vanadium and titanium in the molten iron, and a smelting heat source is insufficient. When RH light treatment is carried out on semi-steel, the temperature drop from the converter process to the vacuum process is larger, the temperature fluctuation is generally more than 50 ℃, and the RH light treatment temperature is difficult to control due to the lower tapping temperature of the converter, so that the stability of the prepared micro-carbon steel is poor.
Disclosure of Invention
The invention aims to provide a method for smelting micro-carbon steel by using vanadium-containing semisteel.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
according to an aspect of the present invention, there is provided a method for smelting micro-carbon steel using vanadium-containing semisteel, comprising the steps of:
The semi-steel is placed in a converter for primary smelting, and the tapping target requirements of molten steel at the primary smelting end point are as follows: the content of C is below 0.06wt%, the content of O is 600-700 ppm, the content of P is below 0.013wt%, the content of S is below 0.015wt%, and the tapping temperature is controlled between 1660 and 1680 ℃;
Carrying molten steel from a small platform behind a furnace to an RH furnace for RH light treatment, controlling the pressure of a vacuum chamber to be 4-8 kPa after the molten steel reaches a station for oxygen determination and temperature measurement, controlling the vacuumizing time to be not more than 9 minutes, controlling the target O content to be 350-550 ppm, performing decarburization cyclic treatment for 5-6 minutes, measuring the temperature and oxygen determination of the molten steel of a ladle, performing final deoxidation and aluminum alloying according to the oxygen determination value, adding high-carbon ferromanganese for manganese alloying, and controlling the outlet target O content to be below 150 ppm;
Lifting molten steel to a casting machine from a station for continuous casting to obtain the micro-carbon steel, wherein the micro-carbon steel comprises the following components: the content of C is 0.005-0.040 wt%, the content of Si is below 0.03wt%, the content of Mn is 0.10-0.30 wt%, the content of P is 0.015wt%, the content of S is below 0.015wt%, and the content of Al is 0.010-0.060 wt%.
According to one embodiment of the invention, the semi-steel is obtained by using vanadium titano-magnetite through blast furnace smelting and converter vanadium extraction.
According to one embodiment of the invention, the C content in the primary-smelted semi-steel is 3.2-3.8 wt%, the P content is below 0.1wt%, the S content is below 0.1wt%, and the temperature is not lower than 1320 ℃.
According to one embodiment of the present invention, when RH light treatment is performed, the carbon-oxygen balance of vacuum decarburization is calculated based on the value of the carbon-oxygen at the arrival, and if the balance is not found, oxygen blowing forced decarburization is performed within 5 minutes from the start of vacuum.
According to one embodiment of the invention, the homogenization time of the alloy after adding the high carbon ferromanganese is not less than 5 minutes.
According to one embodiment of the invention, the RH outbound target ingredients are as follows: the content of C is 0.005-0.040 wt%, the content of Si is below 0.03wt%, the content of Mn is 0.10-0.30 wt%, the content of P is 0.015wt%, the content of S is below 0.015wt%, and the content of Al is 0.010-0.060 wt%.
According to one embodiment of the invention, the RH outbound target temperature is 1572-1582 ℃.
According to one embodiment of the invention, the method further comprises performing molten steel sedation after the RH light treatment is completed, the molten steel sedation time being between 10 and 30 minutes.
According to one embodiment of the invention, the method further comprises performing an LF furnace process prior to performing the RH light treatment.
According to one embodiment of the present invention, the LF process meets at least one of the following requirements:
Argon double-pass or single-pass is blown at the bottom of the ladle;
the molten steel in the ladle is heated to leave the target temperature: 1600-1605 ℃; and
The ladle slag surface is modified by adopting active lime, and a high-aluminum slag modifier is added into the ladle within 1 minute before heating is finished;
When the method comprises an LF furnace working procedure, the temperature of primary steel refining of the converter is controlled to be 1640-1665 ℃, and the P content is below 0.017 wt%.
By adopting the technical scheme, compared with the prior art, the method for smelting micro-carbon steel by using the vanadium-containing semisteel provided by the invention reduces the temperature fluctuation of RH light treatment and optimizes the decarburization rate of RH working procedure by controlling the carbon content, the temperature and the free oxygen activity in the steel of the converting end point of the converter, and the manufacturing success rate of the micro-carbon steel is about 90% before adopting the technical scheme of the invention, and is improved to 98% after adopting the technical scheme of the invention, the fluctuation range of the components is smaller, and the control is more stable.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:
FIG. 1 shows a flow chart of a method of smelting mild steel using vanadium-containing semisteel according to one embodiment of the invention.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
Furthermore, references herein to "an embodiment" mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The invention provides a method for smelting micro-carbon steel by using vanadium-containing semisteel, as shown in fig. 1, which comprises the following steps:
Step 1: the semi-steel is placed in a converter for primary smelting, and the tapping target requirements of molten steel at the primary smelting end point are as follows: the content of C is below 0.06wt%, the content of O is 600-700 ppm, the content of P is below 0.013wt%, the content of S is below 0.015wt%, and the tapping temperature is controlled between 1660 and 1680 ℃;
Step 2: carrying molten steel from a small platform behind a furnace to an RH furnace for RH light treatment, controlling the pressure of a vacuum chamber to be 4-8 kPa after the molten steel reaches a station for oxygen determination and temperature measurement, controlling the vacuumizing time to be not more than 9 minutes, controlling the target O content to be 350-550 ppm, performing decarburization cyclic treatment for 5-6 minutes, measuring the temperature and oxygen determination of the molten steel of a ladle, performing final deoxidation and aluminum alloying according to the oxygen determination value, adding high-carbon ferromanganese for manganese alloying, and controlling the outlet target O content to be below 150 ppm;
Step3: lifting molten steel from a station to a casting machine for continuous casting to obtain micro-carbon steel, wherein the micro-carbon steel comprises the following components: the content of C is 0.005-0.040 wt%, the content of Si is below 0.03wt%, the content of Mn is 0.10-0.30 wt%, the content of P is 0.015wt%, the content of S is below 0.015wt%, and the content of Al is 0.010-0.060 wt%.
In the method of the invention, the semi-steel is obtained by using vanadium titano-magnetite through blast furnace smelting and converter vanadium extraction. The molten steel smelted by the vanadium titano-magnetite blast furnace has high vanadium content compared with common molten steel, and vanadium is an important resource, so vanadium must be extracted before molten steel steelmaking to prepare vanadium slag. After the molten iron is subjected to the vanadium extraction process, vanadium is removed in the form of vanadium slag, and the rest is called semisteel, so that the original carbon content of a converter is low in order to extract vanadium and titanium in the molten iron, and a smelting heat source is insufficient. When RH light treatment is carried out on semi-steel, the temperature drop from the converter process to the vacuum process is larger, the temperature fluctuation is generally more than 50 ℃, and the RH light treatment temperature is difficult to control due to the lower tapping temperature of the converter, so that the stability of the prepared micro-carbon steel is poor. Therefore, the carbon content, oxygen content and temperature of the converter converting needs to be controlled.
The RH light treatment process mainly comprises the following 3 stages: the first stage is mainly a carbon-oxygen reaction stage, and is started from vacuumizing, the chemical reaction of "[ C ] + [ O ] & gt-CO ≡" is generated in the RH vacuum chamber, the reaction can save alloy aluminum required by deoxidation and improve the purity of molten steel; the second stage is a deoxidizing alloying stage, and it is generally considered that the aluminum-adding deoxidizing operation can be performed after w ([ C ]) in the steel is less than or equal to 0.01%, and then other alloying elements such as carbon, manganese and the like are adjusted; the third stage is a pure circulation stage, which refers to the period from adding the last alloy material to breaking and emptying, and is the stage of component homogenization and inclusion floating removal. The carbon content, oxygen content and temperature before RH treatment have an important effect on the reaction rate of the carbon oxygen reaction.
The light treatment control procedure is that after the molten steel reaches a station for oxygen determination and temperature measurement, the pressure of a vacuum chamber is controlled to be 4-8 kPa, the vacuumizing time is controlled to be not more than 9 minutes, the target O content is 350-550 ppm, after decarburization circulation treatment is carried out for 5-6 minutes, the temperature of the molten steel of the ladle is measured, oxygen determination is carried out, final deoxidation and aluminum alloying are carried out according to the oxygen determination value, then high-carbon ferromanganese is added for manganese alloying, and the output target O content is controlled to be below 150 ppm. Under the condition that the O content of the molten steel is proper before RH treatment, the vacuum degree does not need to be reduced and the vacuumizing time does not need to be prolonged. And controlling the content of the outbound target O to improve the cleanliness of the molten steel.
In some embodiments of the invention, the primary-charged "semisteel" has a C content of 3.2-3.8 wt%, a P content of less than 0.1wt%, and an S content of less than 0.1wt%, at a temperature of not less than 1320 ℃. When the converter is tapped, a sliding plate is used for stopping slag, and the slag thickness is less than or equal to 80mm; headroom: 300-800 mm; slag washing in the tapping process: adding 500+/-100 Kg of active lime; ladle slag top slag modification: adding 300+/-20 Kg of ladle top slag modifier; ladle argon blowing duration of a converter post-refining small platform: and (3) not less than 3min.
In some embodiments of the invention, when RH light treatment is performed, the carbon-oxygen balance of vacuum decarburization is calculated according to the carbon-oxygen value of the arrival station, and if the balance is not balanced, oxygen blowing forced decarburization is performed within 5 minutes from the start of vacuum. The number of open branches of the argon small pipe of the vacuum chamber insertion pipe: more than or equal to 8 pieces, and the insertion depth of the insertion tube is 530-650 mm. And when decarburization is circularly treated for 5-6 minutes, measuring the temperature of the ladle molten steel and determining oxygen, and adopting an aluminum wire to carry out final deoxidation and aluminum alloying according to the oxygen determination value.
In some embodiments of the invention, high carbon ferromanganese (manganese metal) alloy is added to homogenize for a period of 5 minutes or more, either simultaneously with or after final deoxidation and aluminum alloying. In some embodiments of the invention, the RH outbound target ingredients are as follows: the content of C is 0.005-0.040 wt%, the content of Si is below 0.03wt%, the content of Mn is 0.10-0.30 wt%, the content of P is 0.015wt%, the content of S is below 0.015wt%, and the content of Al is 0.010-0.060 wt%. In some embodiments of the invention, the RH outbound target temperature is 1572-1582 ℃.
In some embodiments of the invention, the method further comprises performing molten steel sedation after the RH light treatment is completed for a molten steel sedation time of 10 to 30 minutes.
In some embodiments of the invention, the method further comprises performing an LF furnace process prior to performing the RH light treatment. The LF furnace procedure needs to meet at least one of the following requirements:
Argon double-pass or single-pass is blown at the bottom of the ladle;
the molten steel in the ladle is heated to leave the target temperature: 1600-1605 ℃; and
The ladle slag surface is modified by adopting active lime, and a high-aluminum slag modifier is added into the ladle within 1 minute before heating is finished;
When the method comprises an LF furnace working procedure, the temperature of primary steel refining of the converter is controlled to be 1640-1665 ℃, and the P content is below 0.017 wt%.
In some embodiments of the present invention, the manufacturing technical points of the continuous casting process are as follows:
(1) With respect to ladle casting:
Checking the quality of a long water gap, judging slag according to a rule, and reducing the erosion of slag to the water gap; the addition amount of the covering agent is as follows: the addition amount of the first ladle furnace is 450-700 kg, and the addition amount of the continuous casting furnace is 0-50 kg (added according to the covering effect of the ladle molten steel); argon blowing speed of long nozzle: 60-60L/min; the service life of the long flow nozzle is less than or equal to 480min;
(2) Regarding ladle casting steel:
the weight of the middle ladle is as follows: 45-75 t;
The temperature requirement of the tundish: 1545-1565 ℃;
(3) Regarding the crystallizer:
Argon blowing of the crystallizer: checking the leakage condition of the flowmeter and the argon pipeline;
Crystallizer water meter: confirming the water gauge number before casting; water gap insertion depth: 120-180 mm; pulling speed: the object is: 0.9m/min (range 0.8-1.1 m/min), improving molten steel quality and ensuring steady casting;
and (3) covering slag: the physical and chemical indexes of the covering slag must meet the ordering standard, the covering slag is added in a small amount, is added on duty and is added evenly, and the usage amount of the covering slag is as follows: 0.4-0.7 kg/t.
The technical scheme of the invention will be further described through specific examples. Unless otherwise indicated, the raw materials, equipment, consumables and the like used in the following examples are all available by conventional commercial means.
Example 1
The semi-steel is placed in a converter for primary smelting, and the tapping target requirements of molten steel at the primary smelting end point are as follows: the content of C is below 0.06wt%, the content of O is 600ppm, the content of P is below 0.013wt%, the content of S is below 0.015wt%, and the tapping temperature is controlled at 1660 ℃. Carrying molten steel from a small platform behind a furnace to an RH furnace for RH light treatment, controlling the pressure of a vacuum chamber to be 4kPa after oxygen determination and temperature measurement from the molten steel to a station in a light treatment control procedure, vacuumizing for 5 minutes, controlling the content of target O to be 350ppm, measuring the temperature and oxygen determination of molten steel of a ladle after decarburization cyclic treatment for 5 minutes, carrying out final deoxidation and aluminum alloying according to the oxygen determination value, adding high-carbon ferromanganese for manganese alloying, controlling the content of the target O at a station to be less than 150ppm, and controlling the content of the target O at a station to be RH as follows: the content of C is 0.005wt%, the content of Si is less than 0.03wt%, the content of Mn is 0.10wt%, the content of P is 0.015wt%, the content of S is less than 0.015wt%, the content of Al is 0.010wt%, and the target temperature of RH outbound is 1572 ℃. And lifting the molten steel to a casting machine from a station to perform continuous casting, so as to obtain the micro-carbon steel.
The micro carbon steel has the following components according to detection: the content of C is 0.00505wt%, the content of Si is less than 0.0295wt%, the content of Mn is 0.105wt%, the content of P is 0.015wt%, the content of S is less than 0.015wt%, the content of Al is 0.0102wt%, and the balance is Fe and unavoidable impurities.
Example 2
The semi-steel is placed in a converter for primary smelting, and the tapping target requirements of molten steel at the primary smelting end point are as follows: the content of C is below 0.06wt%, the content of O is 650ppm, the content of P is below 0.013wt%, the content of S is below 0.015wt%, and the tapping temperature is controlled at 1670 ℃. Carrying molten steel from a small platform behind a furnace to an RH furnace for RH light treatment, controlling the pressure of a vacuum chamber to be 6kPa after the molten steel reaches a station for oxygen determination and temperature measurement in a light treatment control procedure, vacuumizing for 7 minutes, controlling the content of target O to be 450ppm, measuring the temperature and oxygen determination of molten steel of a ladle after decarburization cyclic treatment for 5 minutes and 30 seconds, carrying out final deoxidation and aluminum alloying according to the oxygen determination value, adding high-carbon ferromanganese for manganese alloying, controlling the content of the target O at a station to be less than 150ppm, and controlling the content of the target components of RH discharging to be as follows: the content of C is 0.025wt%, the content of Si is less than 0.03wt%, the content of Mn is 0.20wt%, the content of P is 0.015wt%, the content of S is less than 0.015wt%, the content of Al is 0.040wt%, and the target temperature for RH outlet is 1578 ℃. And lifting the molten steel to a casting machine from a station to perform continuous casting, so as to obtain the micro-carbon steel.
The micro carbon steel has the following components according to detection: the content of C is 0.0251wt%, the content of Si is less than 0.03wt%, the content of Mn is 0.203wt%, the content of P is 0.015wt%, the content of S is less than 0.015wt%, the content of Al is 0.0405wt%, and the balance is Fe and unavoidable impurities.
Example 3
The semi-steel is placed in a converter for primary smelting, and the tapping target requirements of molten steel at the primary smelting end point are as follows: the content of C is below 0.06wt%, the content of O is 700ppm, the content of P is below 0.013wt%, the content of S is below 0.015wt%, and the tapping temperature is controlled at 1680 ℃. Carrying molten steel from a small platform behind a furnace to an RH furnace for RH light treatment, controlling the pressure of a vacuum chamber to be 8kPa after oxygen determination and temperature measurement from the molten steel to a station in a light treatment control procedure, vacuumizing for 9 minutes, controlling the content of target O to be 550ppm, measuring the temperature and oxygen determination of molten steel of a ladle after decarburization cyclic treatment for 6 minutes, carrying out final deoxidation and aluminum alloying according to the oxygen determination value, adding high-carbon ferromanganese for manganese alloying, controlling the content of the target O at a station to be less than 150ppm, and controlling the content of the target O at a station to be RH as follows: the content of C is 0.040wt%, the content of Si is less than 0.03wt%, the content of Mn is 0.30wt%, the content of P is 0.015wt%, the content of S is less than 0.015wt%, the content of Al is 0.060wt%, and the target temperature of RH outlet is 1582 ℃. And lifting the molten steel to a casting machine from a station to perform continuous casting, so as to obtain the micro-carbon steel.
The micro carbon steel has the following components according to detection: the content of C is 0.0402wt%, the content of Si is less than 0.03wt%, the content of Mn is 0.303wt%, the content of P is 0.015wt%, the content of S is less than 0.015wt%, the content of Al is 0.0608wt%, and the balance is Fe and unavoidable impurities.
Example 4
The semi-steel is placed in a converter for primary smelting, and the tapping target requirements of molten steel at the primary smelting end point are as follows: the content of C is below 0.06wt%, the content of O is 600ppm, the content of P is below 0.017wt%, the content of S is below 0.015wt%, and the tapping temperature is controlled at 1640 ℃. Molten steel is conveyed to an LF furnace from a small platform behind the furnace for refining, and argon is blown into the ladle bottom for double pass. The oxygen adjustment reference value was 600ppm, and for every 1.3ppm increase in oxygen activity, 1kg of aluminum iron was correspondingly increased. The temperature target of the molten steel in the ladle at the heating leaving station is 1605 ℃, active lime is adopted to carry out ladle slag modification, and a high-aluminum slag modifier is added into the ladle within 1 minute before the heating is finished. Transferring the molten steel to an RH furnace for RH light treatment, controlling the working procedure of light treatment to be that after the molten steel arrives at a station for oxygen determination and temperature measurement, controlling the pressure of a vacuum chamber to be 4kPa, vacuumizing for 5 minutes, controlling the content of target O to be 350ppm, measuring the temperature of molten steel of a ladle for oxygen determination after decarburization and cyclic treatment for 5 minutes, carrying out final deoxidation and aluminum alloying according to the oxygen determination value, adding high-carbon ferromanganese for manganese alloying, controlling the content of outbound target O to be below 150ppm, and controlling the content of RH outbound target components to be as follows: the content of C is 0.02wt%, the content of Si is less than 0.03wt%, the content of Mn is 0.15wt%, the content of P is 0.015wt%, the content of S is less than 0.015wt%, the content of Al is 0.030wt%, and the target temperature for RH outbound is 1577 ℃. And lifting the molten steel to a casting machine from a station to perform continuous casting, so as to obtain the micro-carbon steel.
The micro carbon steel has the following components according to detection: the content of C is 0.0205wt%, the content of Si is less than 0.029wt%, the content of Mn is 0.148wt%, the content of P is 0.015wt%, the content of S is less than 0.015wt%, the content of Al is 0.0302wt%, and the balance is Fe and unavoidable impurities.
The preferred embodiments of the present invention have been described in detail hereinabove, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solutions of the present invention within the scope of the technical concept of the present invention, and these simple modifications all fall within the scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (10)
1. A method for smelting micro-carbon steel by using vanadium-containing semisteel, which is characterized by comprising the following steps:
The semi-steel is placed in a converter for primary smelting, and the tapping target requirements of molten steel at the primary smelting end point are as follows: the content of C is below 0.06wt%, the content of O is 600-700 ppm, the content of P is below 0.013wt%, the content of S is below 0.015wt%, and the tapping temperature is controlled between 1660 and 1680 ℃;
Carrying molten steel from a small platform behind a furnace to an RH furnace for RH light treatment, controlling the pressure of a vacuum chamber to be 4-8 kPa after the molten steel reaches a station for oxygen determination and temperature measurement, controlling the vacuumizing time to be not more than 9 minutes, controlling the target O content to be 350-550 ppm, performing decarburization cyclic treatment for 5-6 minutes, measuring the temperature and oxygen determination of the molten steel of a ladle, performing final deoxidation and aluminum alloying according to the oxygen determination value, adding high-carbon ferromanganese for manganese alloying, and controlling the outlet target O content to be below 150 ppm;
Lifting molten steel to a casting machine from a station for continuous casting to obtain the micro-carbon steel, wherein the micro-carbon steel comprises the following components: the content of C is 0.005-0.040 wt%, the content of Si is below 0.03wt%, the content of Mn is 0.10-0.30 wt%, the content of P is 0.015wt%, the content of S is below 0.015wt%, and the content of Al is 0.010-0.060 wt%.
2. The method according to claim 1, wherein the "semisteel" is obtained after blast furnace smelting and converter vanadium extraction using vanadium titano-magnetite.
3. The method according to claim 1, wherein the C content in the primary-smelted "semi-steel" is 3.2-3.8 wt%, the P content is less than 0.1wt%, the S content is less than 0.1wt%, and the temperature is not lower than 1320 ℃.
4. The method according to claim 1, wherein the RH light treatment is performed by calculating a vacuum decarburization carbon-oxygen balance based on the value of the carbon-oxygen at the start of the process, and if the balance is not found, the forced decarburization by blowing oxygen is performed within 5 minutes from the start of the vacuum.
5. The method of claim 1, wherein the homogenization time of the alloy after addition of the high carbon ferromanganese is no less than 5 minutes.
6. The method of claim 1, wherein the RH outbound target ingredients are as follows: the content of C is 0.005-0.040 wt%, the content of Si is below 0.03wt%, the content of Mn is 0.10-0.30 wt%, the content of P is 0.015wt%, the content of S is below 0.015wt%, and the content of Al is 0.010-0.060 wt%.
7. The method of claim 6, wherein the RH outbound target temperature is 1572-1582 ℃.
8. The method of claim 1, further comprising performing molten steel sedation after the end of the RH light treatment for a period of 10 to 30 minutes.
9. The method of claim 1, further comprising performing an LF furnace process prior to performing the RH light treatment.
10. The method of claim 9, wherein the LF process meets at least one of the following requirements:
Argon double-pass or single-pass is blown at the bottom of the ladle;
the molten steel in the ladle is heated to leave the target temperature: 1600-1605 ℃; and
The ladle slag surface is modified by adopting active lime, and a high-aluminum slag modifier is added into the ladle within 1 minute before heating is finished;
When the method comprises an LF furnace working procedure, the temperature of primary steel refining of the converter is controlled to be 1640-1665 ℃, and the P content is below 0.017 wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410195520.6A CN118086617A (en) | 2024-02-22 | 2024-02-22 | Method for smelting micro-carbon steel by using vanadium-containing semisteel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410195520.6A CN118086617A (en) | 2024-02-22 | 2024-02-22 | Method for smelting micro-carbon steel by using vanadium-containing semisteel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118086617A true CN118086617A (en) | 2024-05-28 |
Family
ID=91146908
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410195520.6A Pending CN118086617A (en) | 2024-02-22 | 2024-02-22 | Method for smelting micro-carbon steel by using vanadium-containing semisteel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118086617A (en) |
-
2024
- 2024-02-22 CN CN202410195520.6A patent/CN118086617A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101484106B1 (en) | Method for Controlling Extremely Low Ti in Extra Low Carbon AlSi-Killed Steel | |
| CN110284049B (en) | External refining method for increasing continuous casting furnace number of ultra-deep drawing cold-rolled enamel steel | |
| CN110527775B (en) | RH refining furnace chemical temperature rising method suitable for low-carbon aluminum killed steel | |
| CN111206177B (en) | Production method of SWRH82B steel with low acid-soluble aluminum content | |
| CN111041352B (en) | External refining production method of wire rod for cutting diamond wire | |
| CN114107826B (en) | Nickel-based high-temperature alloy and preparation method thereof | |
| CN108676966B (en) | Smelting method of automobile steel | |
| CN113913580B (en) | Production method of ultralow-carbon low-aluminum structural molten steel | |
| CN102965589B (en) | Mechanical expanding machine pull rod shaft with high fatigue strength and preparation method thereof | |
| CN115927795B (en) | Ultrahigh Al for producing bearing steel2O3Refining slag system and preparation process thereof | |
| CN106929635A (en) | Steel ingot and its manufacture method | |
| CN115261564B (en) | Pure iron as non-aluminum deoxidizing material for amorphous soft magnetic thin belt and preparation method thereof | |
| EP3674424B1 (en) | Smelting method for ultra-low carbon 13cr stainless steel | |
| CN101948979B (en) | Method for producing industrial pure iron | |
| CN118086617A (en) | Method for smelting micro-carbon steel by using vanadium-containing semisteel | |
| CN112647017A (en) | Method for controlling inclusions in gear steel | |
| CN113564449A (en) | Semi-steel smelting method of phosphorus-containing high-strength IF steel | |
| CN101948980B (en) | Method for producing industrial pure iron | |
| CN115404309B (en) | Molten steel deoxidizing method | |
| CN115558839B (en) | Production method of P91 steel ingot | |
| CN116479313B (en) | Sulfur-containing aluminum-containing steel and preparation method and application thereof | |
| WO2023274222A1 (en) | Calcium treatment method for molten steel | |
| CN115896624B (en) | Nitriding steel 31CrMoV9 annealed material and production method thereof | |
| CN117947239B (en) | Low-phosphorus converter smelting method and production method of low-temperature steel | |
| CN104911301B (en) | Smelting process capable of increasing tire cord steel boron yield |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |