CN109097553B - IF steel bulge defect control method - Google Patents
IF steel bulge defect control method Download PDFInfo
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- CN109097553B CN109097553B CN201810691080.8A CN201810691080A CN109097553B CN 109097553 B CN109097553 B CN 109097553B CN 201810691080 A CN201810691080 A CN 201810691080A CN 109097553 B CN109097553 B CN 109097553B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 87
- 239000010959 steel Substances 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000007547 defect Effects 0.000 title claims abstract description 27
- 238000001816 cooling Methods 0.000 claims abstract description 56
- 238000010583 slow cooling Methods 0.000 claims abstract description 48
- 238000000137 annealing Methods 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 16
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 5
- 230000032683 aging Effects 0.000 claims description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 238000005097 cold rolling Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 5
- 238000006748 scratching Methods 0.000 description 4
- 230000002393 scratching effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000002860 competitive effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention belongs to the technical field of cold rolling and discloses an IF steel bulge defect control method, which comprises the following steps: judging whether an anti-bulging production mode is performed or not according to the specification and the carbon equivalent of the strip steel, and once the mode is entered, implementing the following steps: obtaining the slow cooling section plate temperature and the flash cooling section plate temperature of the plate in the slow cooling section and the flash cooling section of the annealing furnace; adjusting the temperature of a top roller chamber and the temperature of a bottom roller chamber of a slow cooling section of the annealing furnace based on the plate temperature of the slow cooling section; and adjusting the temperature of the top roller chamber and the temperature of the bottom roller chamber of the flash cooling section of the annealing furnace based on the temperature of the flash cooling section plate, and reducing the temperature difference between the plate rollers.
Description
Technical Field
The invention relates to the technical field of cold rolling, in particular to an IF steel bulge defect control method.
Background
With the increasing market competition, higher requirements are put forward on the diversity of steel production and the stability of surface quality. The ultimate gauge wide gauge automotive sheet is a very competitive product. However, the production difficulty of the wide automobile plate is high, buckling, bulging and scratching phenomena are easy to occur in a cold area, and the improvement of the overall quality and the production efficiency of the product is severely restricted. In the prior art, the defects are mostly reduced by a method of reducing the temperature and the tension of a cold area; but for IF steel with over-limit specification, the incidence rate of cold zone bulging and scratch defects is still high.
Disclosure of Invention
The invention provides a method for controlling IF steel drum packet defects, which solves the technical problem that the IF steel drum packet defects with the width exceeding the limit specification are high in incidence rate in the prior art.
In order to solve the technical problem, the invention provides an IF steel drum packet defect control method, which comprises the following steps:
judging whether an anti-bulging production mode is performed or not according to the specification and the carbon equivalent of the strip steel, and once the mode is entered, implementing the following steps:
obtaining the slow cooling section plate temperature and the flash cooling section plate temperature of the plate in the slow cooling section and the flash cooling section of the annealing furnace;
adjusting the temperature of a top roller chamber and the temperature of a bottom roller chamber of a slow cooling section of the annealing furnace based on the plate temperature of the slow cooling section;
and adjusting the temperature of the top roller chamber and the temperature of the bottom roller chamber of the flash cooling section of the annealing furnace based on the temperature of the flash cooling section plate, and reducing the temperature difference between the plate rollers.
Further, the adjusting the top roll chamber temperature and the bottom roll chamber temperature of the slow cooling section of the lehr based on the slow cooling section plate temperature comprises:
setting the top roller chamber temperature and the bottom roller chamber temperature of the slow cooling section to be 1.8-2 times of the plate temperature of the slow cooling section;
wherein, the formula is as follows1＝αT11Executing control; TT1The set values of the temperature of the top roller chamber and the temperature of the bottom roller chamber of the slow cooling section are shown in the specification, and α is a safety factor and ranges from 1.8 to 2.
Further, the adjusting the top roll chamber temperature and the bottom roll chamber temperature of the flash section of the lehr based on the flash section plate temperature comprises:
setting the temperature of a top roller chamber and the temperature of a bottom roller chamber of the flash cooling section to be 1.9-1.95 times of the temperature of the flash cooling section plate;
wherein, the formula is as follows2＝αT22Executing control; TT2The temperature of the top roller chamber and the temperature of the bottom roller chamber of the flash cooling section are set values, α is a safety factor, and the range is 1.9-1.95.
Further, the control method further includes:
setting the temperature of the slow cooling section to be 480-490 ℃;
the temperature of the strip steel of the slow cooling section is controlled according to the following formula:
T1is a temperature set value T of the strip steel in the slow cooling section11The temperature setting value of the slow cooling section anti-bulging strip steel is set.
Further, the control method further includes:
setting the temperature of the flash cooling section to be 265-275 ℃;
the strip steel temperature of the flash cooling section is controlled according to the following formula:
T2for flash cooling section strip steel temperature set value, T22The temperature setting value of the flash cooling section anti-bulging strip steel is provided.
Further, the control method further includes:
setting the aging temperature to be 235-245 ℃;
wherein the aging temperature is controlled according to the following formula:
T3the set value T of the temperature of the strip steel in the overaging section33The temperature setting value of the overaging section anti-bulging strip steel is set.
Further, the control method further includes:
setting the final cooling section tension of the annealing furnace to be 3.5-4 MPa;
wherein, the tension of the final cooling section is controlled according to the following formula:
TE0for the unit tension, TE, of the strip steel in the final cooling section1The tension of the final cooling section strip steel anti-bulging unit is provided.
Further, the production speed of the annealing furnace is controlled at 150-200 m/min;
wherein the production speed is controlled according to the following formula:
v0set value v for strip speed1The speed setting value of the anti-bulging strip steel is provided.
Further, the IF steel comprises the following components in percentage by weight: less than or equal to 0.0014 percent of C, less than or equal to 0.04 percent of Si, Mn: 0.11-0.16%, P is less than or equal to 0.01%, S is less than or equal to 0.01%, Alt: 0.03 to 0.055%, Ti: 0.05-0.09%, less than or equal to 0.004% of N, and the balance of Fe.
Further, the thickness range of the IF steel: 0.8-1.0 mm, and a width of 1850mm or more.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
according to the IF steel bulge defect control method provided in the embodiment of the application, aiming at the defects of ultra-wide thin IF steel bulges and scratches caused by scratching, the temperatures of the top roller chamber and the bottom roller chamber of the slow cooling section and the flash cooling section are set to be a follow-up control mode for tracking the temperature of a plate, so that the temperature difference between strip steel and a furnace roller is ensured to be at a lower level, the bulge defect caused by uneven local heating is avoided, and the scratch caused by scratching peripheral equipment caused by deformation of the strip steel is avoided. Meanwhile, the lower temperature difference of the steel rods also avoids the transverse temperature difference of the strip steel caused by excessive contact heat transfer of the strip steel, further reduces the risk of bulging and ensures the quality of the strip steel.
Drawings
Fig. 1 is a control flow chart of an IF steel drum packet defect control method provided by an embodiment of the invention.
Detailed Description
The embodiment of the application provides an IF steel bulge defect control method, and solves the technical problem that in the prior art, the IF steel bulge with the width exceeding the limit specification is high in defect occurrence rate.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the description and the specific embodiments, and it should be understood that the specific features in the examples and the examples of the present invention are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features in the examples and the examples of the present application may be combined with each other without conflict.
An IF steel drum packet defect control method comprises the following steps:
obtaining the slow cooling section plate temperature and the flash cooling section plate temperature of the plate in the slow cooling section and the flash cooling section of the annealing furnace;
adjusting the temperature of a top roller chamber and the temperature of a bottom roller chamber of a slow cooling section of the annealing furnace based on the plate temperature of the slow cooling section;
and adjusting the temperature of the top roller chamber and the temperature of the bottom roller chamber of the flash cooling section of the annealing furnace based on the temperature of the flash cooling section plate, and reducing the temperature difference between the plate rollers.
Specifically, the temperatures of a flash cooling section and a top and bottom roller chamber of a slow cooling section of the annealing furnace are set to be in a control mode of tracking the temperature of the plate, namely, the temperature changes along with the change of the temperature of the plate; the condition that the temperature difference is gradually increased due to the fact that the temperature of the top roller and the bottom roller is still in a preset high state after the plate temperature is cooled is avoided; the temperature of the top and bottom roller chambers is reduced along with the tracking of the plate temperature; on one hand, the device can be used for controlling the temperature difference between the top and bottom rollers and the plate to be in a relatively stable state, and avoiding the bulge defect caused by uneven local heating of a large temperature difference of the steel roller due to the fact that the plate is passively heated secondarily in the high-temperature state of the top and bottom roller chamber; on the other hand, the following change can also realize scientific control of the temperature of the roller chamber, the reasonable change of the temperature of the roller chamber is pointed out, the temperature difference of the steel rollers can be stabilized, the heating quality of the roller pair is ensured, the uncontrollable heat transfer between the steel rollers is avoided, the transverse temperature difference of the plate is effectively limited, the bulge defect is further limited, the scratch defect caused by the bulge defect is overcome, and the quality of the plate is ensured.
The following is a detailed description of the above method.
Referring to fig. 1, said adjusting the top roll chamber temperature and the bottom roll chamber temperature of the slow cooling section of the lehr based on the slow cooling section plate temperature comprises:
and setting the temperature of the top roller chamber and the temperature of the bottom roller chamber of the slow cooling section to be 1.8-2 times of the temperature of the plate of the slow cooling section.
Wherein, the formula is as follows1＝αT11Executing control; TT1The set values of the temperature of the top roller chamber and the temperature of the bottom roller chamber of the slow cooling section are shown in the specification, and α is a safety factor and ranges from 1.8 to 2.
That is to say, will the top roll room temperature and the bottom roll room temperature of slow cooling section set up according to the multiple of board temperature, generally control according to 1.8 ~ 2 times, under the condition that can guarantee the heating quality of roller room pair roller, also can restrict the temperature of roller and can not too high, lead to the difference in temperature too big.
Generally, the temperature control of the roller chamber mainly consists of the temperature control of the heater in the roller chamber, so that the temperature control of the roller chamber is relatively more accurate.
Similarly, the adjusting the top roll chamber temperature and the bottom roll chamber temperature of the flash section of the lehr based on the flash section plate temperature comprises:
and setting the temperature of the top roller chamber and the temperature of the bottom roller chamber of the flash cooling section to be 1.9-1.95 times of the temperature of the flash cooling section plate.
Wherein, the formula is as follows2＝αT22Executing control; TT2The temperature of the top roller chamber and the temperature of the bottom roller chamber of the flash cooling section are set values, α is a safety factor, and the range is 1.9-1.95.
Along with the continuous decline of board temperature, the influence of difference in temperature to panel also appears more sensitive, and the influence of the same difference in temperature to panel quality is also more obvious, in view of this, the temperature control of roller room also needs more accurate, consequently, the control quality of difference in temperature has further been guaranteed to the control coefficient of 1.9 ~ 1.95 times.
Further, on the basis of the temperature control of the roller chamber, the control method further comprises the following steps:
and setting the temperature of the slow cooling section to be 480-490 ℃.
The temperature of the strip steel of the slow cooling section is controlled according to the following formula:
T1is a temperature set value T of the strip steel in the slow cooling section11The temperature setting value of the slow cooling section anti-bulging strip steel is set.
That is, under the control of the temperature of the roller chamber, the accurate temperature control of the cold area is increased, and the temperature of the strip steel plate is limited, so that the temperature is at a lower level, thereby increasing the difficulty of the thermal deformation of the strip steel and limiting the bulge defect.
Similarly, the control method further includes:
setting the temperature of the flash cooling section to be 265-275 ℃; and setting the aging temperature to be 235-245 ℃.
The strip steel temperature of the flash cooling section is controlled according to the following formula:
T2for flash cooling section strip steel temperature set value, T22The temperature setting value of the flash cooling section anti-bulging strip steel is provided.
The aging temperature is controlled according to the following formula:
T3the set value T of the temperature of the strip steel in the overaging section33The temperature setting value of the overaging section anti-bulging strip steel is set.
In the case of low-temperature control, tension control is added to form a matched measure, and specifically, the control method further comprises the following steps: the final cooling section tension of the annealing furnace is set to 3.5 to 4 MPa.
Wherein, the tension of the final cooling section is controlled according to the following formula:
TE0for the unit tension, TE, of the strip steel in the final cooling section1The tension of the final cooling section strip steel anti-bulging unit is provided.
Furthermore, the composition control is increased, and the bulge risk is further limited; the IF steel comprises the following components in percentage by weight: less than or equal to 0.0014 percent of C, less than or equal to 0.04 percent of Si, Mn: 0.11-0.16%, P is less than or equal to 0.01%, S is less than or equal to 0.01%, Alt: 0.03 to 0.055%, Ti: 0.05-0.09%, less than or equal to 0.004% of N, and the balance of Fe.
Accordingly, the thickness range of the IF steel: 0.8-1.0 mm, and a width of 1850mm or more. The production speed of the annealing furnace is controlled at 150-200 m/min.
The production speed of the annealing furnace is controlled at 150-200 m/min;
wherein the production speed is controlled according to the following formula:
v0set value v for strip speed1The speed setting value of the anti-bulging strip steel is provided.
Referring to fig. 1, the present embodiment further provides a method
This is illustrated by a specific embodiment.
Aiming at the thickness of 0.9mm, 1850mm, the components by weight percentage are C: 0.0014%, Si: 0.04%, Mn: 0.16%, P: 0.01%, S: 0.01%, Alt: 0.055%, Ti: 0.09%, N: rolling the IF steel with the balance of Fe by 0.004%, wherein the temperature multiple of the roller chamber of the slow cooling section is controlled to be 1.925 times of the plate temperature, and the temperature multiple of the roller chamber of the flash cooling section is controlled to be 1.9 times of the plate temperature; the temperature of the slow cooling section is set to be 485 ℃, and the temperature of the flash cooling section is set to be 270 ℃; the ageing temperature was set to 240 ℃. The production speed of the annealing furnace was controlled at 175m/min, and the final cooling zone tension of the annealing furnace was set at 4 MPa.
The rolling comparison data shows that when wide IF steel is produced, the temperature difference between the furnace roller and the strip steel is reduced from 160 ℃ to about 40 ℃, and the transverse temperature difference of the strip steel is reduced from 40 ℃ to about 25 ℃. The probability of subsequent bulge is reduced from 42.5% to 17.3%. The scratch of the IF steel with the limit specification is greatly reduced from over 100 tons to less than 20 tons.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
according to the IF steel bulge defect control method provided in the embodiment of the application, aiming at the defects of ultra-wide thin IF steel bulges and scratches, the temperatures of the top roller chamber and the bottom roller chamber of the slow cooling section and the flash cooling section are set to be a follow-up control mode for tracking the temperature of a plate, so that the temperature difference between strip steel and a furnace roller is ensured to be at a lower level, the bulge defect of local uneven heating is avoided, and the scratch caused by scratching peripheral equipment due to deformation of the strip steel is avoided. Meanwhile, the lower temperature difference of the steel rods also avoids the transverse temperature difference of the strip steel caused by excessive contact heat transfer of the strip steel, further reduces the risk of bulging and ensures the quality of the strip steel.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (3)
1. An IF steel drum packet defect control method is characterized by comprising the following steps:
judging whether an anti-bulging production mode is performed or not according to the specification and the carbon equivalent of the strip steel, and once the mode is entered, implementing the following steps:
obtaining the slow cooling section plate temperature and the flash cooling section plate temperature of the plate in the slow cooling section and the flash cooling section of the annealing furnace;
adjusting the temperature of a top roller chamber and the temperature of a bottom roller chamber of a slow cooling section of the annealing furnace based on the plate temperature of the slow cooling section;
adjusting the temperature of a top roller chamber and the temperature of a bottom roller chamber of a flash cooling section of the annealing furnace based on the temperature of the flash cooling section plate, and reducing the temperature difference between the plate rollers;
the judging whether to carry out the anti-bulging production mode according to the specification and the carbon equivalent of the strip steel comprises the following steps: when the width of the IF steel is larger than or equal to 1800mm, the thickness of the IF steel is smaller than or equal to 1.0mm and the carbon equivalent is smaller than 0.01, entering an anti-bulging production mode;
adjusting the top roller chamber temperature and the bottom roller chamber temperature of the slow cooling section of the annealing furnace based on the slow cooling section plate temperature comprises:
setting the top roller chamber temperature and the bottom roller chamber temperature of the slow cooling section to be 1.8-2 times of the plate temperature of the slow cooling section;
wherein, the formula is as follows1＝αT11Executing control; TT1α is a safety factor, and the range is 1.8-2;
adjusting the top roll chamber temperature and the bottom roll chamber temperature of the flash cooling section of the annealing furnace based on the flash cooling section plate temperature comprises:
setting the temperature of a top roller chamber and the temperature of a bottom roller chamber of the flash cooling section to be 1.9-1.95 times of the temperature of the flash cooling section plate;
wherein, the formula is as follows2＝αT22Executing control; TT2α is a safety factor, and the range is 1.9-1.95;
the control method further comprises the following steps:
setting the temperature of the slow cooling section to be 480-490 ℃;
the temperature of the strip steel of the slow cooling section is controlled according to the following formula:
T1is a temperature set value T of the strip steel in the slow cooling section11The temperature set value of the slow cooling section anti-bulging strip steel is set;
the control method further comprises the following steps:
setting the temperature of the flash cooling section to be 265-275 ℃;
the strip steel temperature of the flash cooling section is controlled according to the following formula:
T2for flash cooling section strip steel temperature set value, T22The temperature set value of the flash cooling section anti-bulging strip steel is set;
the control method further comprises the following steps:
setting the aging temperature to be 235-245 ℃;
wherein the aging temperature is controlled according to the following formula:
T3the set value T of the temperature of the strip steel in the overaging section33The temperature set value of the anti-bulging strip steel at the overaging section;
the control method further comprises the following steps:
setting the final cooling section tension of the annealing furnace to be 3.5-4 MPa;
wherein, the tension of the final cooling section is controlled according to the following formula:
TE0for the unit tension, TE, of the strip steel in the final cooling section1The final cooling section strip steel anti-bulging unit tension;
the production speed of the annealing furnace is controlled at 150-200 m/min;
wherein the production speed is controlled according to the following formula:
v0set value v for strip speed1The speed setting value of the anti-bulging strip steel is provided.
2. The IF steel bulge defect control method according to claim 1, wherein the IF steel comprises the following components in percentage by weight: less than or equal to 0.0014 percent of C, less than or equal to 0.04 percent of Si, Mn: 0.11-0.16%, P is less than or equal to 0.01%, S is less than or equal to 0.01%, Alt: 0.03 to 0.055%, Ti: 0.05-0.09%, less than or equal to 0.004% of N, and the balance of Fe.
3. The IF steel drum packet defect control method of claim 2, characterized in that: thickness range of the IF steel: 0.8-1.0 mm, and a width of 1850mm or more.
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| JP3114593B2 (en) * | 1995-11-21 | 2000-12-04 | 住友金属工業株式会社 | Steel plate manufacturing method |
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| CN102719742B (en) * | 2012-06-18 | 2014-01-29 | 首钢总公司 | Furnace zone through plate method of limit-specification IF steel |
| CN103710523A (en) * | 2013-12-20 | 2014-04-09 | 鞍钢股份有限公司 | Method for controlling continuous annealing and wrinkling of wide IF steel |
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| CN106148652B (en) * | 2016-08-29 | 2018-06-22 | 首钢京唐钢铁联合有限责任公司 | Method and device for continuously annealing cold-rolled sheet |
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