CN106636574A - Method and device for removing steel strip oxidation tint - Google Patents
Method and device for removing steel strip oxidation tint Download PDFInfo
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- CN106636574A CN106636574A CN201611013306.6A CN201611013306A CN106636574A CN 106636574 A CN106636574 A CN 106636574A CN 201611013306 A CN201611013306 A CN 201611013306A CN 106636574 A CN106636574 A CN 106636574A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 140
- 239000010959 steel Substances 0.000 title claims abstract description 140
- 230000003647 oxidation Effects 0.000 title claims abstract description 47
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 claims abstract description 42
- 238000001816 cooling Methods 0.000 claims abstract description 40
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 238000010583 slow cooling Methods 0.000 claims abstract description 21
- 238000000137 annealing Methods 0.000 description 26
- 230000001590 oxidative effect Effects 0.000 description 9
- 239000001257 hydrogen Substances 0.000 description 6
- 229910052739 hydrogen Inorganic materials 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007769 metal material 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
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000004383 yellowing Methods 0.000 description 1
Classifications
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention provides a method and device for removing steel strip oxidation tint. The method comprises the steps of producing the steel strip in a preset production period; controlling heating temperature of 770-800 DEG C, slow cooling temperature of 630-680 DEG C, fast cooling temperature of 250-310 DEG C, and over-aging temperature of 240-300 DEG C in the production process; controlling the steel strip speed of less than 200/min at a furnace area, with the deviation of +/-10m/min; controlling leakage temperature of -55 - -45 DEG C in the furnace; in this way, if the steel strip to be produced is high-strength steel, producing the high-strength steel 24-48h after starting the steel strip production line so as to effectively avoid the oxidation tint of the contact part between the steel strip and furnace rollers; controlling the steel strip running speed at the furnace area and the fast cooling temperature of <=320 DEG C in the production process, and preventing atmosphere in the furnace from being oxidized through controlling the leakage temperature in the furnace, so that the problem of the oxidation tint occurred on the surface of the steel strip is solved basically, and the quality and grade of the steel strip are improved so as to avoid economic loss.
Description
Technical Field
The invention belongs to the technical field of metal materials, and particularly relates to a method and a device for eliminating oxidation color of strip steel.
Background
In recent years, with the gradual improvement of the surface quality requirements of users on cold-rolled products, the oxidation color defect (yellowing, bluing or blackening exists on the surface of strip steel when the strip steel is off-line) on the surface of continuous annealing high-strength steel is taken as a typical surface defect, the coating and further deep processing of the users are seriously influenced, and the requirements of high-end cold-rolled sheets are difficult to meet.
The generation of oxidation color of the high-strength steel not only affects the surface quality of the strip steel and reduces the grade of products, but also causes great loss to the economic benefit of steel companies and seriously affects the normal production rhythm.
Based on this, there is a need for a method for eliminating the oxidation color on the surface of the steel strip to solve the above problems in the prior art.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a method and a device for eliminating the oxidation color of strip steel, which are used for solving the technical problems that the quality is reduced and the product grade is reduced due to the oxidation color on the surface of the strip steel in the process of producing the strip steel.
The invention provides a method for eliminating oxidation color of strip steel, which comprises the following steps:
producing the strip steel in a preset production period;
in the production process, the heating temperature is controlled to be 770-800 ℃, the slow cooling temperature is controlled to be 630-680 ℃, the fast cooling temperature is controlled to be 250-310 ℃, and the overaging temperature is controlled to be 240-300 ℃;
controlling the speed of a furnace zone of the strip steel to be less than 200m/min, and controlling the speed fluctuation of the furnace zone to be +/-10 m/min;
the temperature of the leakage point in the furnace is controlled to be-55 ℃ to-45 ℃.
In the above scheme, the strip steel comprises: high-strength steels having tensile strengths of 340MPa, 490MPa, 590MPa, 790MPa and 980 MPa.
In the scheme, when the tensile strength is 340MPa, the rapid cooling temperature is controlled to be 300-310 ℃.
In the scheme, when the tensile strength is 590MPa, the rapid cooling temperature is controlled to be 280-290 ℃.
In the scheme, when the tensile strength is 980MPa, the rapid cooling temperature is controlled to be 250-260 ℃.
In the scheme, the preset production period is 24-48 hours after the production line is started.
The invention also provides a device for eliminating the oxidation color of the strip steel, which comprises:
the first control unit is used for controlling the heating temperature to 770-800 ℃, the slow cooling temperature to 630-680 ℃, the fast cooling temperature to 250-310 ℃ and the overaging temperature to 240-300 ℃ in the production process of the strip steel;
the second control unit is used for controlling the speed of the furnace area of the strip steel to be less than 200m/min and controlling the speed fluctuation of the furnace area to be +/-10 m/min;
and the third control unit is used for controlling the temperature of the leakage point in the furnace to be-55 ℃ to-45 ℃.
In the scheme, when the tensile strength of the strip steel is 340MPa, the first control unit controls the rapid cooling temperature to be 300-310 ℃.
In the scheme, when the tensile strength of the strip steel is 590MPa, the first control unit controls the rapid cooling temperature to be 280-290 ℃.
In the scheme, when the tensile strength of the strip steel is 980MPa, the first control unit controls the rapid cooling temperature to be 250-260 ℃.
The invention provides a method and a device for eliminating the oxidation color of strip steel, wherein the method comprises the following steps: producing the strip steel in a preset production period; in the production process, the heating temperature is controlled to be 770-800 ℃, the slow cooling temperature is controlled to be 630-680 ℃, the fast cooling temperature is controlled to be 250-310 ℃, and the overaging temperature is controlled to be 240-300 ℃; controlling the speed of a furnace zone of the strip steel to be less than 200m/min, and controlling the speed fluctuation of the furnace zone to be +/-10 m/min; controlling the temperature of a leakage point in the furnace to be-55 ℃ to-45 ℃; therefore, when the strip steel to be produced is high-strength steel, the high-strength steel is produced after the strip steel production line is started for 24-48 hours, and oxidation color at the contact part of the strip steel and the furnace roller can be effectively avoided; in the production process, the running speed of the strip steel in a furnace area is stabilized, the rapid cooling temperature is controlled to be less than or equal to 320 ℃, and the oxidizing atmosphere in the furnace is avoided by controlling the temperature of a leakage point in the furnace, so that the problem of oxidation color on the surface of the strip steel is fundamentally solved, the quality and the grade of the strip steel are improved, and the economic loss is avoided.
Drawings
FIG. 1 is a schematic flow chart of a method for removing oxidation color of strip steel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a device for eliminating the oxidation color of strip steel according to a second embodiment of the present invention.
Detailed Description
In the production process of strip steel, in order to eliminate the problem of oxidation color on the surface of the strip steel, improve the quality and the grade of the strip steel and avoid economic loss, the invention provides a method and a device for eliminating the oxidation color of the strip steel, wherein the method comprises the following steps: producing the strip steel in a preset production period; in the production process, the heating temperature is controlled to be 770-800 ℃, the slow cooling temperature is controlled to be 630-680 ℃, the fast cooling temperature is controlled to be 250-310 ℃, and the overaging temperature is controlled to be 240-300 ℃; controlling the speed of a furnace zone of the strip steel to be less than 200m/min, and controlling the speed fluctuation of the furnace zone to be +/-10 m/min; the temperature of the leakage point in the furnace is controlled to be-55 ℃ to-45 ℃.
The technical solution of the present invention is further described in detail by the accompanying drawings and the specific embodiments.
Example one
The embodiment provides a method for eliminating oxidation color of strip steel, as shown in fig. 1, the method mainly comprises the following steps:
and 110, producing the strip steel in a preset production period.
In the step, the furnace (continuous annealing furnace) is stopped for a long time and then started, so that the edge of the strip steel is easy to generate oxidation color, and after the furnace is started, the whole plate surface of the strip steel contacted with the furnace roller generates oxidation color. Therefore, in the production of the steel strip, the steel strip is required to be produced within a preset production period. Wherein the preset period is 24-48 h after the production line (starting) is started. Preferably 24h, 25h or 30 h.
The strip steel can be high-strength steel and specifically comprises the following components: high-strength steels having tensile strengths of 340MPa, 490MPa, 590MPa, 790MPa and 980 MPa.
Here, the continuous annealing furnace is a vertical continuous annealing furnace, and includes, in total: a preheating section, a heating section, a soaking section, a slow cooling section, a fast cooling section, an overaging section, a final cooling section, a water quenching section and the like. The furnace chambers are connected by channels. To prevent oxidation, the furnace is filled with a nitrogen-hydrogen protective gas containing 5% to 10% (HNx) hydrogen, preferably 5%, 7% or 9%.
And step 111, controlling the heating temperature to 770-800 ℃, the slow cooling temperature to 630-680 ℃, the fast cooling temperature to 250-310 ℃ and the overaging temperature to 240-300 ℃ in the production process.
In the step, when the continuous annealing furnace is used for annealing the strip steel, the heating temperature of the heating section is controlled to be 70-800 ℃, the slow cooling temperature of the slow cooling section is controlled to be 630-680 ℃, the fast cooling temperature of the fast cooling section is controlled to be 250-310 ℃, and the overaging temperature of the overaging section is controlled to be 240-300 ℃. Wherein the temperatures of the strip steels with different tensile strengths are different. In addition, in order to ensure that the surface of the strip steel is not scratched, the distance between an air box of the continuous annealing furnace and the strip steel is controlled to be not less than 65 mm; preferably 70, 85 or 100 mm.
And 112, controlling the furnace area speed of the strip steel to be less than 200m/min and controlling the fluctuation to be +/-10 m/min.
In the step, in the production process of the strip steel, in order to prevent the problem of oxidation color on the surface of the strip steel caused by the over-high speed of a furnace zone of the strip steel, the furnace zone speed of the strip steel is controlled to be less than or equal to 200 m/min; preferably, it is 180m/min or 190 m/min. And the speed fluctuation of the furnace zone is controlled to be +/-10 m/min.
And 113, controlling the temperature of a leakage point in the furnace to be-55 to-45 ℃.
In the step, in the production process of strip steel, in order to avoid oxidizing atmosphere in a furnace and leading the surface of the strip steel to be in oxidation color, the temperature of a leakage point in the furnace is controlled to be-55 ℃ to-45 ℃; preferably-46 deg.C, -50 deg.C or-54 deg.C.
During the maintenance test of the annealing furnace, in order to avoid the oxidizing atmosphere in the annealing furnace, oxygen detection equipment is used for detecting whether the radiant tube in the annealing furnace leaks or not, and if the radiant tube leaks, the radiant tube needs to be replaced immediately.
According to the method for eliminating the oxidation color of the strip steel, when the strip steel to be produced is high-strength steel, the high-strength steel is produced after the strip steel production line is started for 24-48 hours, so that the oxidation color of the contact part of the strip steel and a furnace roller can be effectively avoided; in the production process, the running speed of the strip steel in a furnace area is stabilized, the rapid cooling temperature is controlled to be less than or equal to 320 ℃, and the oxidizing atmosphere in the furnace is avoided by controlling the temperature of a leakage point in the furnace, so that the problem of oxidation color on the surface of the strip steel is fundamentally solved, the quality and the grade of the strip steel are improved, and the economic loss is avoided.
Example two
Corresponding to the first embodiment, the present embodiment further provides an apparatus for removing oxidation color from a steel strip, as shown in fig. 2, the apparatus includes: a first control unit 21, a second control unit 22, a third control unit 23; wherein,
firstly, the edge of the strip steel is easy to generate oxidation color due to long-time shutdown and then start of the furnace (continuous annealing furnace), and after the vehicle is started, the whole plate surface of the strip steel contacted with the furnace roller generates oxidation color. Therefore, in the production of the steel strip, the steel strip is required to be produced within a preset production period. Wherein the preset period is 24-48 h after the production line (starting) is started. Preferably 24h, 25h or 30 h. The strip steel can be high-strength steel and specifically comprises the following components: high-strength steels having tensile strengths of 340MPa, 490MPa, 590MPa, 790MPa and 980 MPa.
Here, the continuous annealing furnace is a vertical continuous annealing furnace, and includes, in total: a preheating section, a heating section, a soaking section, a slow cooling section, a fast cooling section, an overaging section, a final cooling section, a water quenching section and the like. The furnace chambers are connected by channels. To prevent oxidation, the furnace is filled with a nitrogen-hydrogen protective gas containing 5% to 10% (HNx) hydrogen, preferably 5%, 7% or 9%.
In the production process of strip steel, when the strip steel is annealed by using a continuous annealing furnace, the first control unit 21 controls the heating temperature of the heating section to be 70-800 ℃, the slow cooling temperature of the slow cooling section to be 630-680 ℃, the fast cooling temperature of the fast cooling section to be 250-310 ℃ and the overaging temperature of the overaging section to be 240-300 ℃. Wherein the temperatures of the strip steels with different tensile strengths are different. In order to ensure that the surface of the strip steel is not scratched, the distance between an air box of the continuous annealing furnace and the strip steel is controlled to be not less than 65 mm; preferably 70, 85 or 100 mm.
Meanwhile, in order to prevent the problem of oxidation color on the surface of the strip steel caused by the excessively high speed of the furnace zone of the strip steel, the second control unit 22 is used for controlling the furnace zone speed of the strip steel to be less than 200m/min, preferably 180m/min or 190 m/min. And the speed fluctuation of the furnace zone is controlled to be +/-10 m/min.
Further, in order to avoid oxidizing atmosphere in the furnace and causing the surface of the strip steel to be in an oxidation color, the third control unit 23 is used for controlling the temperature of a leakage point in the furnace to be-55 ℃ to-45 ℃ in the production process of the strip steel; preferably-46 deg.C, -50 deg.C or-54 deg.C.
During the maintenance test of the annealing furnace, in order to avoid the oxidizing atmosphere in the annealing furnace, oxygen detection equipment is used for detecting whether the radiant tube in the annealing furnace leaks or not, and if the radiant tube leaks, the radiant tube needs to be replaced immediately.
In practical applications, the first control Unit 21, the second control Unit 22 and the third control Unit 23 can be implemented by a Central Processing Unit (CPU), a Digital Signal Processor (DSP), a Programmable logic Array (FPGA), and a Micro Control Unit (MCU) in the apparatus.
According to the device for eliminating the oxidation color of the strip steel, when the strip steel to be produced is high-strength steel, the high-strength steel is produced after the strip steel production line is started for 24-48 hours, so that the oxidation color of the contact part of the strip steel and a furnace roller can be effectively avoided; in the production process, the running speed of the strip steel in a furnace area is stabilized, the rapid cooling temperature is controlled to be less than or equal to 320 ℃, and the oxidizing atmosphere in the furnace is avoided by controlling the temperature of a leakage point in the furnace, so that the problem of oxidation color on the surface of the strip steel is fundamentally solved, the quality and the grade of the strip steel are improved, and the economic loss is avoided.
EXAMPLE III
In practical application, when the tensile strengths of the strip steel are 340MPa, 590MPa and 980MPa respectively, the method provided by the first embodiment and the device provided by the second embodiment are used for producing the strip steel, and the specific processes are as follows:
firstly, because the furnace (continuous annealing furnace) is easy to be oxidized at the edge of the strip steel after the furnace is stopped for a long time and then started, the oxidation color is generated on the whole plate surface of the strip steel contacted with the furnace roller after the furnace is started. Therefore, in the production of the steel strip, the steel strip is required to be produced within a preset production period. Wherein the preset period is 24-48 h after the production line (starting) is started. In this example 26 h.
Here, the continuous annealing furnace is a vertical continuous annealing furnace, and includes, in total: a preheating section, a heating section, a soaking section, a slow cooling section, a fast cooling section, an overaging section, a final cooling section, a water quenching section and the like. The furnace chambers are connected by channels. To prevent oxidation, the furnace is charged with a protective gas of nitrogen and hydrogen containing 5% hydrogen (HNx), preferably 6%.
Secondly, when the strip steel is annealed by a continuous annealing furnace, when the strength of the strip steel is 340MPa, the heating temperature of the heating section is controlled to 770-780 ℃, preferably 771, 775 or 779 ℃.
The slow cooling temperature of the slow cooling section is controlled to be 630-640 ℃, preferably 631, 635 or 639 ℃.
The rapid cooling temperature of the rapid cooling section is controlled to be 300-310 ℃, preferably 301, 305 or 309 ℃.
The overaging temperature of the overaging section is controlled to be 290-300 ℃, preferably 291, 295 or 299 ℃.
When the strength of the strip steel is 590MPa, the heating temperature of the heating section is controlled to be 780-790 ℃, preferably 781, 785 or 789 ℃.
The slow cooling temperature of the slow cooling section is controlled to be 650-660 ℃, preferably 651, 655 or 659 ℃.
The rapid cooling temperature of the rapid cooling section is controlled to be 280-290 ℃, preferably 281, 285 or 289 ℃.
The overaging temperature of the overaging section is controlled to be 270-280 ℃, preferably 271, 275 or 279 ℃.
When the strength of the strip steel is 980MPa, the heating temperature of the heating section is controlled to be 790-800 ℃, preferably 791, 795 or 799 ℃.
The slow cooling temperature of the slow cooling section is controlled to be 670-680 ℃, preferably 671, 675 or 679 ℃.
The rapid cooling temperature of the rapid cooling section is controlled to be 250-260 ℃, preferably 251, 255 or 259 ℃.
The overaging temperature of the overaging stage is controlled to be 240-250 ℃, preferably 241, 245 or 249 ℃.
Further, in order to ensure that the surface of the strip steel is not scratched, the distance between an air box of the continuous annealing furnace and the strip steel is controlled to be not less than 65 mm; preferably 80 mm.
In the production process of the strip steel, in order to prevent the problem of oxidation color on the surface of the strip steel caused by the over-high speed of a furnace zone of the strip steel, the furnace zone speed of the strip steel is controlled to be less than or equal to 200 m/min; preferably, it is 180m/min or 190 m/min; and the speed fluctuation of the furnace zone is controlled to be +/-10 m/min.
In order to avoid oxidizing atmosphere in the furnace and leading the surface of the strip steel to be in oxidation color, the temperature of a leakage point in the furnace is controlled to be minus 55 ℃ to minus 45 ℃; preferably-46 deg.C, -50 deg.C or-54 deg.C.
During the maintenance test of the annealing furnace, in order to avoid the oxidizing atmosphere in the annealing furnace, oxygen detection equipment is used for detecting whether the radiant tube in the annealing furnace leaks or not, and if the radiant tube leaks, the radiant tube needs to be replaced immediately.
In the embodiment, when the method for eliminating the oxidation color on the surface of the strip steel provided by the first embodiment and the device for eliminating the oxidation color on the surface of the strip steel provided by the second embodiment are respectively used for producing the strip steel with different tensile strengths, the problem of oxidation color on the surface of the strip steel can be well avoided, the quality grade of products is improved, and the economic benefit is improved.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (10)
1. A method for eliminating the oxidation color of strip steel is characterized by comprising the following steps:
producing the strip steel in a preset production period;
in the production process, the heating temperature is controlled to be 770-800 ℃, the slow cooling temperature is controlled to be 630-680 ℃, the fast cooling temperature is controlled to be 250-310 ℃, and the overaging temperature is controlled to be 240-300 ℃;
controlling the speed of a furnace zone of the strip steel to be less than 200m/min, and controlling the speed fluctuation of the furnace zone to be +/-10 m/min;
the temperature of the leakage point in the furnace is controlled to be-55 ℃ to-45 ℃.
2. The method of claim 1, wherein the strip comprises: high-strength steels having tensile strengths of 340MPa, 490MPa, 590MPa, 790MPa and 980 MPa.
3. The method according to claim 2, wherein the rapid cooling temperature is controlled to be 300 to 310 ℃ when the tensile strength is 340 MPa.
4. The method according to claim 2, wherein the rapid cooling temperature is controlled to be 280 to 290 ℃ when the tensile strength is 590 MPa.
5. The method of claim 2, wherein the rapid cooling temperature is controlled to be 250 to 260 ℃ when the tensile strength is 980 MPa.
6. The method of claim 1, wherein the predetermined production period is 24 to 48 hours after starting the production line.
7. An apparatus for removing oxidation color from a strip, said apparatus comprising:
the first control unit is used for controlling the heating temperature to 770-800 ℃, the slow cooling temperature to 630-680 ℃, the fast cooling temperature to 250-310 ℃ and the overaging temperature to 240-300 ℃ in the production process of the strip steel;
the second control unit is used for controlling the speed of the furnace area of the strip steel to be less than 200m/min and controlling the speed fluctuation of the furnace area to be +/-10 m/min;
and the third control unit is used for controlling the temperature of the leakage point in the furnace to be-55 ℃ to-45 ℃.
8. The apparatus of claim 7, wherein the first control unit controls the rapid cooling temperature to be 300-310 ℃ when the tensile strength of the strip steel is 340 MPa.
9. The apparatus of claim 7, wherein the first control unit controls the rapid cooling temperature to be 280-290 ℃ when the tensile strength of the strip steel is 590 MPa.
10. The apparatus of claim 7, wherein the first control unit controls the rapid cooling temperature to be 250 to 260 ℃ when the tensile strength of the steel strip is 980 MPa.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112893459A (en) * | 2021-01-14 | 2021-06-04 | 山东钢铁集团日照有限公司 | Plate shape control method for cold rolling limit wide thin deep drawing steel |
| CN113416820A (en) * | 2021-05-25 | 2021-09-21 | 鞍钢股份有限公司 | Method for preventing surface oxidation of cold-rolled high-strength steel plate for automobile during continuous annealing |
| CN114836603A (en) * | 2022-04-12 | 2022-08-02 | 江苏常宝普莱森钢管有限公司 | Surface quality adjusting process for bright heat treatment furnace |
| CN115747473A (en) * | 2022-11-01 | 2023-03-07 | 鞍钢股份有限公司 | Cold-rolled high-strength automobile steel surface color difference control method |
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| US20090308498A1 (en) * | 2007-01-09 | 2009-12-17 | Kenichiro Matsumura | Method of production and production facility of high strength cold rolled steel sheet excellent in chemical convertibility |
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| CN105648178A (en) * | 2016-03-07 | 2016-06-08 | 首钢京唐钢铁联合有限责任公司 | Method for controlling oxide color of dual-phase steel in cold rolling continuous annealing process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112893459A (en) * | 2021-01-14 | 2021-06-04 | 山东钢铁集团日照有限公司 | Plate shape control method for cold rolling limit wide thin deep drawing steel |
| CN112893459B (en) * | 2021-01-14 | 2022-04-22 | 山东钢铁集团日照有限公司 | Plate shape control method for cold rolling limit wide thin deep drawing steel |
| CN113416820A (en) * | 2021-05-25 | 2021-09-21 | 鞍钢股份有限公司 | Method for preventing surface oxidation of cold-rolled high-strength steel plate for automobile during continuous annealing |
| CN114836603A (en) * | 2022-04-12 | 2022-08-02 | 江苏常宝普莱森钢管有限公司 | Surface quality adjusting process for bright heat treatment furnace |
| CN115747473A (en) * | 2022-11-01 | 2023-03-07 | 鞍钢股份有限公司 | Cold-rolled high-strength automobile steel surface color difference control method |
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