CN114672610A - HRB400E steel washing bag treatment method - Google Patents
HRB400E steel washing bag treatment method Download PDFInfo
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- CN114672610A CN114672610A CN202210374512.9A CN202210374512A CN114672610A CN 114672610 A CN114672610 A CN 114672610A CN 202210374512 A CN202210374512 A CN 202210374512A CN 114672610 A CN114672610 A CN 114672610A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 163
- 239000010959 steel Substances 0.000 title claims abstract description 163
- 238000000034 method Methods 0.000 title claims abstract description 61
- 238000005406 washing Methods 0.000 title claims abstract description 37
- 239000002893 slag Substances 0.000 claims abstract description 51
- 238000003756 stirring Methods 0.000 claims abstract description 38
- 238000007670 refining Methods 0.000 claims abstract description 30
- 238000010079 rubber tapping Methods 0.000 claims abstract description 25
- 238000003723 Smelting Methods 0.000 claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 238000012545 processing Methods 0.000 claims abstract description 11
- 238000004321 preservation Methods 0.000 claims abstract description 8
- 239000010903 husk Substances 0.000 claims abstract description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 37
- 238000010438 heat treatment Methods 0.000 claims description 31
- 229910052786 argon Inorganic materials 0.000 claims description 19
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 16
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 16
- 239000004571 lime Substances 0.000 claims description 16
- 230000009467 reduction Effects 0.000 claims description 14
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 11
- 239000010436 fluorite Substances 0.000 claims description 11
- 229910001570 bauxite Inorganic materials 0.000 claims description 7
- 230000008569 process Effects 0.000 abstract description 40
- 230000007306 turnover Effects 0.000 abstract description 13
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 230000002159 abnormal effect Effects 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 3
- 238000009628 steelmaking Methods 0.000 abstract description 2
- 238000009847 ladle furnace Methods 0.000 description 49
- 238000010521 absorption reaction Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 10
- 238000009749 continuous casting Methods 0.000 description 8
- 230000017525 heat dissipation Effects 0.000 description 5
- 239000000956 alloy Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 230000033764 rhythmic process Effects 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
-
- 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
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides a method for processing HRB400E steel wash packs, and relates to the technical field of steel making. The treatment method of the HRB400E steel washing bag comprises the following steps: s1: carrying out converter tapping and slag washing treatment on HRB400E steel; s2: performing LF refining or smelting, including adding slag charge to LF, performing LF low-grade slagging, switching high-grade power transmission and power failure stirring; s3: the grain husk is fully paved on the slag surface to realize heat preservation. In the process of processing HRB400E steel ladle washing, ladle washing heat HRB400E is changed into a BOF-LF-CC process route, in the LF refining or smelting process, slag materials are added into LF, LF low-gear slagging is carried out, high-gear power transmission is switched, power is cut off, stirring is carried out, cold ladles fully absorb heat, temperature drop is greatly reduced, production and quality are more controllable, meanwhile, the cold ladles are changed into hot ladles, normal turnover is met, and accidents such as low-temperature molten steel return to a furnace, abnormal final pouring and the like caused by abnormal molten steel temperature drop are avoided.
Description
Technical Field
The invention relates to the technical field of steel making, in particular to a HRB400E steel ladle washing processing method.
Background
The existing ladle categories are A, B, C, D, E, F, G, H eight grades. E. The F, G, H grade ladle is defined as a cold steel ladle, and the temperature of the ladle is between 600 and 900 ℃. The grade E ladle judgment standard is that the steel is cast till tapping is carried out for 180-300 minutes; the F-level package judgment standard is that the time from the completion of steel pouring to steel tapping is 300-960 minutes; the G-level ladle judgment standard is that the time from the completion of steel pouring to steel tapping of a standby ladle after the baking of the medium and small repair ladles exceeds 960 minutes; the H-level package judgment standard is a standby package after the baking time of the overhaul package is finished.
When HRB400E runs through a BOF-argon station-CC in the traditional process route and meets a cold ladle which needs to be turned over urgently, the cold ladle absorbs heat quickly, and compared with other steel types running through the argon station process route, HRB400E has the advantages that the alloy amount added during converter tapping is larger, and the temperature loss caused by alloy melting is more. The temperature drop of the tapping of the converter of the heat using the cold ladle usually reaches more than 100 ℃, the temperature of the tapping of the converter of the heat using the cold ladle does not meet the temperature requirement of the cold ladle at all, the production organization is difficult, and the low-temperature remelting and abnormal final pouring accidents of continuous casting molten steel easily occur, so that the HRB400E is not suitable for the process route of an argon station when being used for the cold ladle.
Disclosure of Invention
The invention aims to provide a method for treating HRB400E steel wash packs, which can solve the technical problems that: in the production operation process of HRB400E steel, when a cold ladle which needs to be turned over urgently is met, the tapping temperature of the converter cannot meet the requirement of temperature drop of the cold ladle, so that the temperature drop of molten steel is abnormal, and low-temperature remelting and abnormal final pouring accidents occur.
Embodiments of the invention may be implemented as follows:
the invention provides a treatment method of an HRB400E steel wash ladle, which comprises the following steps:
s1: carrying out converter tapping and slag washing treatment on HRB400E steel;
s2: performing LF refining or smelting, including adding slag charge to LF, performing LF low-grade slagging, switching high-grade power transmission, and stopping power for stirring;
s3: the grain husk is fully paved on the slag surface to realize heat preservation.
The processing method of the HRB400E steel wash pack provided by the embodiment of the invention has the beneficial effects that:
in the process of processing HRB400E steel ladle washing, ladle washing heat HRB400E is changed into a BOF-LF-CC process route, so the process is adjusted to an LF process route, and in the LF refining or smelting process, slag materials are added into LF, LF low-level slag melting is carried out, high-level power transmission is switched, power is cut off, stirring is carried out, so that cold ladles fully absorb heat, temperature drop is greatly reduced, production and quality are more controllable, meanwhile, the cold ladles are transited to hot ladles, normal turnover is met, and accidents such as low-temperature remelting of molten steel, abnormal final pouring and the like caused by abnormal molten steel temperature drop are avoided.
In an alternative embodiment, the step of adding slag to the LF comprises:
the amount of slag added in LF is: 4-5 kg lime and 1-1.5 kg fluorite per ton steel, and the slag thickness is controlled at 140-160 mm.
Therefore, when the cold ladle is processed in the LF process, compared with other conventional LF processes for smelting and ladle washing, the addition amount of slag materials is larger, and submerged arc temperature rise and heat preservation effects can be improved.
In an alternative embodiment, the step of performing LF low-range slagging comprises:
and 4, slagging at a low gear for 4-6 min, and heating at a speed of 2 ℃/min until the temperature reaches the requirement.
Therefore, the thickness of the slag is controlled to be 140-160 mm, the submerged arc effect can be improved, and heat dissipation can be reduced.
In an optional embodiment, the step of switching to high-level power transmission and power-off stirring comprises the following steps:
the temperature is raised at the high gear, and the temperature raising speed is 6 ℃/min.
In an optional embodiment, the step of switching to high-level power transmission and power-off stirring comprises the following steps:
heating for many times and stirring while stopping power supply until the theoretical normal temperature drop temperature is zero.
Therefore, the theoretical normal temperature drop temperature is zero, which indicates that the cold ladle absorbs heat completely, the hot state is equal to the normal turnover hot ladle, the high-temperature area operation can be stopped, and the subsequent operation is carried out according to the conventional LF process.
In an alternative embodiment, the step of raising the temperature for a plurality of times and stopping stirring until the theoretical normal temperature drop temperature is zero comprises:
the first heating is carried out by utilizing a high gear according to the initial temperature T of the cold steel ladleInitial temperature of cold ladleThe temperature rise temperature is as follows: T1679-TInitial temperature of cold ladle/10(℃)，TInitial temperature of cold ladleThe temperature range of the temperature is 600-900 ℃, the power is cut off in the high-temperature interval for forced stirring for 5 minutes, and the temperature of the stirred molten steel is measured to be T1；
And (3) carrying out secondary heating, wherein the heating temperature requirement is as follows: T1679-TInitial temperature of cold ladle/10(℃)+△T1，△T1Is a theoretical normal temperature drop temperature TIs normal-T1Cutting off power and stirring for 5min, and measuring the temperature of the molten steel after stirring to be T2；
To carry outAnd (3) heating for the third time, wherein the heating temperature requirement is as follows: T1679-TInitial temperature of cold ladle/10(℃)+△T2，△T2Lowering the temperature T to the theoretical normal temperatureIs normal-T2；
Until the Nth heating, the heating temperature is required to be as follows: T1679-TInitial temperature of cold ladle/10(℃)+△TN-1，△TN-1Lowering the temperature by a theoretical normal temperatureN-1＝TIs normal-TN-1＝0。
Thus, the temperature of the cold ladle is decreased according to the value Y of the temperature decrease of the cold ladle after the first 1 times of temperature increase(N-1)Corresponding temperature compensation is carried out on the last 1-time main heating so as to further improve the heat absorption effect of the packing.
In an optional embodiment, the step of switching to high-level power transmission and power-off stirring comprises the following steps:
under the conditions that the temperature rise times N are less than or equal to 3 and the theoretical normal temperature drop temperature delta T is greater than 0, firstly, argon is introduced to ensure that the temperature drop of the steel ladle meets the requirement; and then, heating the ladle to meet the requirement of the refining out-station temperature.
Thus, when the production rhythm is short, argon is introduced and the temperature of the ladle is raised to ensure that the temperature of the continuous casting tundish meets the requirement.
In an alternative embodiment, the step of introducing argon gas to make the temperature of the ladle reach the requirement comprises:
observing the difference between the temperature drop of the LF cold steel ladle and the temperature drop of the normal red steel ladle, and measuring the temperature drop multiple of the LF cold steel ladle in unit time.
In an alternative embodiment, the refining exit temperature is the red ladle refining exit to tundish temperature drop of normal turnover by cold ladle temperature drop multiple + tundish maximum temperature.
Thus, through the previous series of ladle heat absorption operations, such as argon station process temperature tapping pre-heat absorption, LF twice high temperature heat absorption and strong stirring, the temperature drop of the cold ladle is greatly reduced, but the slight difference of individual heat times is not eliminated compared with the hot ladle in normal turnover. The temperature drop trend is used as a parameter, so that the operation is modeled and easier, and better tundish temperature is provided for continuous casting.
In an alternative embodiment, the step of converter tapping and slag washing treatment of HRB400E steel comprises:
controlling the tapping temperature of the converter at 1660 +/-15 ℃ to ensure that the cold steel ladle primarily absorbs heat, wherein the slag washing treatment comprises adding 3-4 kg of lime per ton of steel and 4-5 kg of bauxite per ton of steel.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a flow chart of a method for processing HRB400E steel wash packs according to an embodiment of the present invention;
FIG. 2 is a flow chart for LF refining or smelting.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
Referring to fig. 1, the present embodiment provides a method for processing an HRB400E steel wash pack, including the following steps:
s1: the HRB400E steel was subjected to converter tapping and slag washing treatment.
Before tapping and slag washing treatment of a converter, a preparation operation area needs to schedule and report a ladle washing plan to a factory, and ladle washing is a refining means of reasonably raising temperature, stirring and the like by using LF (ladle furnace), so that a cold ladle is rapidly converted into a hot ladle, smooth production is realized, and the operation process of subsequent continuous casting operation can be carried out. The ladle washing heat HRB400E is changed into a BOF-LF-CC process route, so that the process route is adjusted into an LF process route, LF can be subjected to submerged arc heating and stirring, a cold ladle can fully absorb heat, the temperature drop is greatly reduced, the production and quality are controllable, and meanwhile, the cold ladle is converted into a hot ladle to meet the requirement of normal turnover. Specifically, a furnace machine is adjusted, refining is carried out in a super-2 furnace section, and the pre-LF bag washing time is 70-80 minutes.
Wherein the tapping temperature of the converter is controlled according to 1660 +/-15 ℃, so that the cold steel ladle primarily absorbs heat. The slag washing treatment comprises adding 3-4 kg lime/ton steel, 4-5 kg bauxite/ton steel, 1.5-2.5 kg lime/ton steel and 0.5-1 kg fluorite/ton steel, preferably, 3.5kg lime/ton steel, 4.5kg bauxite/ton steel, 2kg refined lime/ton steel and 0.5 g fluorite/ton steel.
S2: performing LF refining or smelting, namely performing cold ladle washing treatment, referring to FIG. 2, and comprising the following steps:
s21: and adding slag into the LF. Specifically, the amount of slag added in the LF is as follows: 4.5kg lime per ton steel, 1kg fluorite per ton steel, wherein the fluorite can be adjusted according to the fluidity. When the cold ladle is processed in LF, the adding amount of slag charge is larger compared with other conventional LF process smelting and ladle washing furnaces, and the purpose is to pay more attention to submerged arc temperature rise and heat preservation effects. In order to keep a certain slag thickness, the slag thickness is controlled to be 140-160 mm, preferably 150mm, the submerged arc effect is improved, heat dissipation is reduced, and therefore the slag amount is increased.
In S1 and S21, the total amount of slag is 7.5-8 kg lime/ton steel, 4.5-5 kg bauxite/ton steel and 1-1.5 kg fluorite/ton steel.
S22: and carrying out LF low-grade slagging.
Specifically, slagging is carried out in a low gear (11 th gear) for 4-6 min, preferably 5min, the temperature rising speed is 2 ℃/min, temperature is measured after 5min, and the temperature is switched to a high gear to rise after meeting the requirement.
S23: and switching to high-level power transmission. Specifically, the temperature is raised by switching to a high gear (4 gears), and the temperature raising speed is 6 ℃/min.
The theoretical basis is as follows: in the production operation process, the temperature of a steel furnace is reduced by 1 ℃ when slag charge and alloy are added every 0.42 kg/ton steel in the smelting process; the temperature after temperature rise (DEG C) is pure temperature rise (DEG C) -slag charge and alloy temperature drop (DEG C). And if the temperature after temperature rise is less than the theoretical calculated value, calculating the current temperature drop value of the cold steel ladle. 4-step temperature rise time (min) ([ theoretical temperature required after temperature rise (° c)) + cold steel ladle temperature drop ] ÷ 6(° c/min).
Specifically, E, F, G, H (corresponding to the temperature of 900 ℃, 800 ℃, 700 ℃ and 600 ℃) cold steel ladles absorb different heat, the temperature drop of each category has a difference of 5-10 ℃, 10 ℃ is taken as the base number, the high-temperature baking principle is similar, the earlier the cold steel ladles reach the high-temperature range, and the better the heat absorption effect of the ladle lining is. The temperature increase of 30 ℃, 40 ℃, 50 ℃ or 60 ℃ according to the standard outbound target temperature aims at the temperature rise and heat absorption of different categories, and simultaneously ensures the heat absorption process of higher temperature of the cold steel ladle. E. F, G, H every time the temperature of the cold ladle is increased by 10 ℃ to be X, the main heating temperature rise is reduced by 0.1X, and the outbound target temperature is respectively as follows according to the corresponding standard: 1559 deg.C + 30-0.1X, 1559 deg.C + 40-0.1X, 1559 deg.C + 50-0.1X, 1559 deg.C + 60-0.1X, i.e. every 10 deg.C increase of cold ladle, the electric arc main heating temp. is reduced by 1 deg.C.
In the actual process, after molten steel enters an LF (ladle furnace) station, firstly, measuring temperature T on site to obtain initial data; then, after 11 grades of molten steel are melted into slag, the temperature T is measured on site0，T0Normal hot ladle theoretical temperature rise value (cold ladle temperature drop value Y)0(ii) a Then, 4-step main heating and main heatingThe operation frequency of the temperature rise to the high temperature region can be set to be 2-N times according to the actual production rhythm.
After the 1 st primary heating, the temperature T is measured on site1Temperature drop value Y of cold ladle1＝T1Normal hot ladle temperature decrease value Y, main heating for Nth time, temperature measurement after temperature increase T(N)The temperature drop value of the cold steel ladle is Y(N). According to the temperature drop value Y of the cold steel ladle after the first 1 times (including preheating)(N-1)Corresponding temperature compensation is carried out on the last 1-time main heating so as to further improve the heat absorption effect of the packing.
Standard outbound target temperatures of cold ladles of different ladle temperatures: 1559 deg.C +30 deg.C-0.1X + Y(N-1)、1559℃+40℃-0.1X+Y(N-1)、1559℃+50℃-0.1X+Y(N-1)、1559℃+60℃-0.1X+Y(N-1)Wherein N is the number of main heating times, Y(N-1)The temperature drop value of the cold steel ladle in the first 1 time, Y(N-1)＝T(N-1)-Y，T(N-1)The temperature value of the previous 1 time is measured, and Y is the temperature drop value of the normal hot ladle.
When Y is(N-1)When the temperature is equal to 0, the cold ladle absorbs heat completely, the hot state is equal to the normal turnover hot ladle, the operation in the high-temperature area can be stopped, and the subsequent operation is carried out according to the conventional LF process. When N is less than or equal to 3 and Y(N-1)>0. When the production rhythm is short, the temperature compensation formula for the cold steel ladle outlet is implemented according to the formula so as to ensure that the temperature of the continuous casting tundish meets the requirement.
Therefore, according to the ladle temperature data of the E, F, G, H cold ladle, when the ladle is cooled at 600 ℃, the molten steel is heated to the process standard outbound temperature of 1559+60 ℃, when the ladle is cooled at 700 ℃, the molten steel is heated to the process standard outbound temperature of 1559+50 ℃, when the ladle is cooled at 800 ℃, the molten steel is heated to the process standard outbound temperature of 1559+40 ℃, and when the ladle is cooled at 900 ℃, the molten steel is heated to the process standard outbound temperature of 1559+30 ℃. In the high-temperature interval, the steel flow is scoured against the ladle wall by cutting off the power and stirring for 5 minutes, so that the steel flow can absorb heat fully. After strong stirring for 5 minutes, measuring the temperature, observing the temperature drop trend, raising the temperature to a high-temperature interval of different categories again, and stirring strongly for 3 minutes to ensure that the steel flow scours the ladle wall again and fully absorbs heat. After strong stirring for 3 minutes, the temperature was measured and the temperature drop trend was observed again. The earlier the molten steel is heated to a high-temperature range and is stirred strongly, and the better the heat absorption effect of the steel ladle is. The temperature drop of the ladle will be gradually reduced by 2 times of high-temperature interval power transmission operation and strong stirring.
Wherein, through the high temperature heat absorption of the 1 st time, the prolonged strong stirring, the temperature drop of the cold steel ladle is reduced, the temperature is raised to the standard outbound target temperature of the 2 nd time, the high temperature heat absorption and the prolonged strong stirring are carried out again, and the heat absorption of the ladle lining is gradually saturated. And judging the temperature drop difference of the 1 st and 2 nd high-temperature regions of the cold steel ladle according to the final different temperature rising effects by using the same temperature rising target and temperature rising speed, and reflecting the difference with the normal hot steel ladle.
S24: argon is introduced to make the ladle reach the refining outlet temperature.
In the whole process, the temperature is measured frequently, and the temperature drop trend is observed, if the argon flow of the red steel ladle is 25m3At the hour, the temperature of the molten steel is reduced by 2 ℃/min, and the argon flow of the cold ladle is 25m3The temperature of the molten steel is reduced by 2.5 ℃/min at the hour, which shows that a little temperature reduction still exists, wherein, 25m is selected3The reduction of the temperature of the hot ladle molten steel by 2 ℃/min at/h argon flow is a random case, and the purpose is to make a comparison, for example, the reduction of the temperature of the hot ladle by 2 ℃/min, the reduction of the temperature of the cold ladle by 2.5 ℃/min, and selecting 10m3And when the argon flow is in the hour, the temperature of the hot ladle is reduced to 1 ℃/min, and the temperature of the cold ladle is reduced to 1.2 ℃/min.
If the temperature of the cold steel ladle is reduced without difference with the temperature of the red steel ladle in normal turnover, namely the temperature is reduced under the same argon flow, the cold steel ladle is proved to absorb heat completely, and the temperature of the red steel ladle in normal turnover is controlled. Calculating to obtain the actual temperature drop multiple according to the ratio of the temperature drop of the cold steel ladle to the temperature drop of the red steel ladle: such as 2.5 ÷ 2 ═ 1.25 (fold). LF outbound-to-tundish temperature drop (24 ℃) -refinery outbound temperature (1559 ℃) -tundish maximum temperature (1535 ℃).
The cold steel ladle temperature correction formula: the temperature of the refining outbound is equal to the temperature reduction of the red steel ladle from the refining outbound to the tundish in normal turnover, namely the temperature reduction multiple of the cold steel ladle and the highest temperature of the tundish, such as: 1535+24 × 1.25 ═ 1565, the temperature of the continuous casting tundish is controlled at 1565 ℃ to meet the preset requirement. Wherein, the specific principle of designing the outbound temperature formula after the last 1 time of temperature rise is as follows: through the previous series of ladle heat absorption operations, such as argon station process temperature tapping pre-heat absorption, LF twice high-temperature heat absorption and strong stirring, although the temperature drop of a cold ladle is greatly reduced, compared with a hot ladle which is normally circulated, the small difference of individual heat times is not eliminated. The temperature drop trend is used as a parameter, so that the operation is modeled and easier, and better tundish temperature is provided for continuous casting.
S3: the grain husk is fully paved on the slag surface to realize heat preservation.
Wherein, the chaff is spread the sediment surface, and it can to stay the light, and furthest reduces the radiation heat dissipation, makes middle package temperature fluctuation more stable, littleer simultaneously.
Example 1
A treatment method of HRB400E steel wash packs comprises the following steps:
step 1: the HRB400E steel was subjected to converter tapping and slag washing treatment.
Specifically, the tapping temperature of the converter is still controlled according to 1660 +/-15 ℃, so that the cold steel ladle primarily absorbs heat; 3.5kg lime/ton steel and 4.5kg bauxite/ton steel are used for steel tapping slag washing, 2kg lime/ton steel and a proper amount of fluorite are used for refining.
Step 2: and performing LF refining or smelting, namely performing cold ladle washing treatment.
Firstly, adding slag: 4.5kg lime/ton steel and 1kg fluorite/ton steel, when the cold ladle is processed in LF, the adding amount of slag charge is larger compared with other conventional LF process smelting and ladle washing furnaces, and the aims of paying more attention to submerged arc temperature rise and heat preservation effects are achieved.
Secondly, after low-gear slagging, heating and stirring for many times until the temperature drop is zero. Starting to utilize a high gear to carry out first temperature rise according to the initial temperature T of the cold steel ladleInitial temperature of cold ladleThe temperature rise temperature is as follows: T1679-TInitial temperature of cold ladle/10(℃)，TInitial temperature of cold ladleThe temperature range of (A) is 600-900 ℃; the steel flow is scoured against the ladle wall to fully absorb heat when the power is cut off and the strong stirring is carried out for 5 minutes in the high-temperature interval, and the temperature of the steel liquid after the stirring is measured to be T1；
Then, carrying out secondary temperature rise, wherein the temperature rise requirement is as follows: T1679-TInitial temperature of cold ladle/10(℃)+△T1，△T1Lowering the temperature T to the theoretical normal temperatureIs normal-T1When the stirring is not performed for 5 minutes, the steel flow washes the ladle wall to fully absorb heat, and the temperature of the molten steel after stirring is measured to be T2；
Then, carrying out third temperature rise, wherein the temperature rise temperature is required to be as follows: T1679-TInitial temperature of cold ladle/10(℃)+△T2，△T2Lowering the temperature T to the theoretical normal temperatureIs normal-T2；
Until the Nth heating, the heating temperature is required to be as follows: T1679-TInitial temperature of cold ladle/10(℃)+△TN-1，△TN-1Lowering the temperature by a theoretical normal temperatureN-1＝TIs normal-TN-10; the cold steel ladle absorbs heat completely, the hot state is equal to that of a normally circulated hot steel ladle, the operation in a high-temperature area can be stopped, and the follow-up operation is carried out according to a conventional LF process.
And step 3: the LF molten steel is transferred to a tundish, chaff is fully paved on the surface of slag without leaving bright light, radiation heat dissipation is reduced to the maximum extent, temperature fluctuation of the tundish is more stable and smaller, in the actual continuous casting and steel casting process, the highest temperature of the tundish and the lowest temperature of the tundish are less than 5 ℃, the minimum temperature fluctuation is realized, and the furnace molten steel is stably cast.
Example 2
Step 1: the HRB400E steel was subjected to converter tapping and slag washing treatment.
Specifically, the tapping temperature of the converter is still controlled according to 1660 +/-15 ℃, so that the cold steel ladle primarily absorbs heat; 3.5kg lime/ton steel and 4.5kg bauxite/ton steel are used for steel tapping slag washing, 2kg lime/ton steel and a proper amount of fluorite are used for refining.
Step 2: and performing LF refining or smelting, namely performing cold ladle washing treatment.
Firstly, adding slag: 4.5kg lime/ton steel and 1kg fluorite/ton steel, when the cold ladle is processed in LF, the adding amount of slag charge is larger compared with other conventional LF process smelting and ladle washing furnaces, and the aims of paying more attention to submerged arc temperature rise and heat preservation effects are achieved.
After adding slag charge, when the production rhythm is tense, the heating-up times N is required to be less than or equal to 3, and delta T is TIs normal-TN-1>When 0 hour, the temperature of the LF molten steel is controlled before the LF molten steel is taken out of the stationThe following operations are taken:
firstly, argon is introduced to ensure that the temperature of the steel ladle is reduced to meet the requirement. Specifically, the temperature drop of the LF cold ladle is observed to be different from that of the normal red ladle, and the temperature drop multiple of the cold ladle in unit time is measured to be VCold/VRed (Red)For example, the argon flow in the red steel ladle is 25m3At the hour, the temperature of the molten steel is reduced by 2 ℃/min, and the argon flow of the cold ladle is 25m3And when the temperature of the molten steel is reduced by 2.5 ℃/min in the hour, calculating to obtain the actual temperature reduction multiple according to the ratio of the temperature reduction of the cold steel ladle to the temperature reduction of the red steel ladle: such as 2.5 ÷ 2 ═ 1.25 (fold).
And then, heating the ladle to meet the requirement of the refining out-station temperature. In particular, the refining outbound temperature T is controlledRefinery outbound＝TTemperature reduction from refining station of normal turnover red steel ladle to tundishMultiple of temperature drop of cold steel ladle + TMaximum temperature of tundish(ii) a Wherein, TTemperature reduction from refining station of normal turnover red steel ladle to tundishThe value of the temperature of the steel plate discharged from the furnace for normal refining-the highest temperature of the tundish is generally fixed. Such as: and (3) performing LF outbound-to-tundish temperature reduction (24 ℃) -refining outbound temperature (1559 ℃) -tundish maximum temperature (1535 ℃), and then refining outbound temperature 1535+24 × 1.25 ═ 1565 ℃, and then managing and controlling at 1565 ℃.
And step 3: the chaff is fully paved on the surface of the slag without leaving bright light, so that the radiation heat dissipation is reduced to the maximum extent, and the temperature fluctuation of the tundish is more stable and smaller.
The treatment method for the HRB400E steel wash pack provided by the embodiment has the beneficial effects that:
in the process of processing HRB400E steel washing, particularly when E, F, G, H cold steel ladles are used for HRB400E steel, the ladle washing heat HRB400E is changed into a BOF-LF-CC process route, so that the process route is adjusted to be an LF process route, in the process of LF refining or smelting, slag is added to LF, LF low-level slag melting is carried out, high-level power transmission is switched, power is cut off, stirring is carried out, the cold steel ladles fully absorb heat, the refining station-leaving temperature is corrected, the temperature of a tundish reaches the preset requirement, production and quality are controllable, meanwhile, the cold steel ladles are transited to be hot steel ladles, normal turnover is met, and accidents such as low-temperature return of molten steel, abnormal final pouring and the like caused by abnormal temperature drop of the molten steel are avoided.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A treatment method of an HRB400E steel wash ladle is characterized in that the treatment method of the HRB400E steel wash ladle comprises the following steps:
s1: carrying out converter tapping and slag washing treatment on HRB400E steel;
s2: performing LF refining or smelting, including adding slag charge to LF, performing LF low-grade slagging, switching high-grade power transmission and power failure stirring;
s3: the grain husk is fully paved on the slag surface to realize heat preservation.
2. The method for processing the HRB400E steel wash pack as claimed in claim 1, wherein the step of adding slag to the LF comprises:
the amount of slag added in LF is: 4-5 kg lime and 1-1.5 kg fluorite per ton steel, and the slag thickness is controlled at 140-160 mm.
3. The method for treating the HRB400E steel washing bag as claimed in claim 1, wherein the step of performing LF low-grade slagging comprises the following steps:
and 4, slagging at a low gear for 4-6 min, and heating at a speed of 2 ℃/min until the temperature reaches the requirement.
4. The method for processing the HRB400E steel wash pack according to claim 1, wherein the step of switching high-level power transmission and power off stirring comprises:
the temperature is raised at the high gear, and the temperature raising speed is 6 ℃/min.
5. The method for processing the HRB400E steel wash pack according to claim 1, wherein the step of switching high-level power transmission and power off stirring comprises:
heating for many times and stirring while stopping power supply until the theoretical normal temperature drop temperature is zero.
6. The method for treating the HRB400E steel wash pack as claimed in claim 5, wherein the step of raising the temperature for a plurality of times and stopping stirring until the theoretical normal temperature drop temperature is zero comprises:
the first heating is carried out by utilizing a high gear according to the initial temperature T of the cold steel ladleInitial temperature of cold ladleThe temperature rise temperature is as follows: T1679-TInitial temperature of cold ladle/10(℃)，TInitial temperature of cold ladleThe temperature range is 600-900 ℃, the forced stirring is stopped for 5 minutes in a high-temperature interval, and the temperature of the stirred molten steel is measured to be T1；
And (3) carrying out secondary heating, wherein the heating temperature requirement is as follows: T1679-TInitial temperature of cold ladle/10(℃)+△T1，△T1Lowering the temperature T to the theoretical normal temperatureIs normal-T1When the power is cut off and the stirring is strong for 5 minutes, the temperature of the molten steel after the stirring is measured as T2；
And (3) carrying out third temperature rise, wherein the temperature rise requirement is as follows: T1679-TInitial temperature of cold ladle/10(℃)+△T2，△T2Is a theoretical normal temperature drop temperature TIs normal-T2；
Until the Nth heating, the heating temperature is required to be as follows: T1679-TInitial temperature of cold ladle/10(℃)+△TN-1，△TN-1Lowering the temperature by a theoretical normal temperatureN-1＝TIs normal-TN-1＝0。
7. The method for processing the HRB400E steel wash pack according to claim 1, wherein the step of switching high-level power transmission and power off stirring comprises:
under the conditions that the temperature rise times N are less than or equal to 3 and the theoretical normal temperature drop temperature delta T is greater than 0, firstly, argon is introduced to ensure that the temperature drop of the steel ladle meets the requirement; and then, heating the ladle to meet the requirement of the refining out-station temperature.
8. The method for treating the HRB400E steel ladle washing as claimed in claim 7, wherein the step of introducing argon to make the ladle temperature drop meet the requirement comprises:
observing the difference between the temperature drop of the LF cold steel ladle and the temperature drop of the normal red steel ladle, and measuring the temperature drop multiple of the LF cold steel ladle in unit time.
9. The method of claim 7 wherein the refining outbound temperature is normal turnaround red ladle refining outbound to tundish temperature reduction cold ladle temperature reduction multiple + tundish maximum temperature.
10. The method for processing the HRB400E steel wash ladle according to claim 1, wherein the step of converter tapping and slag washing HRB400E steel comprises:
controlling the tapping temperature of the converter at 1660 +/-15 ℃ to ensure that the cold steel ladle primarily absorbs heat, wherein the slag washing treatment comprises adding 3-4 kg of lime per ton of steel and 4-5 kg of bauxite per ton of steel.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115287397A (en) * | 2022-08-08 | 2022-11-04 | 广东韶钢松山股份有限公司 | LF refining method under low iron-steel ratio |
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| US6540957B1 (en) * | 1999-08-27 | 2003-04-01 | Kawasaki Steel Corporation | Ladle, a ladle heating system and methods of heating the ladle |
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