CN107828951B - Method and device for manufacturing cold-rolled high-strength steel - Google Patents
Method and device for manufacturing cold-rolled high-strength steel Download PDFInfo
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- CN107828951B CN107828951B CN201710957654.7A CN201710957654A CN107828951B CN 107828951 B CN107828951 B CN 107828951B CN 201710957654 A CN201710957654 A CN 201710957654A CN 107828951 B CN107828951 B CN 107828951B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 131
- 239000010959 steel Substances 0.000 title claims abstract description 131
- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 155
- 238000005096 rolling process Methods 0.000 claims abstract description 111
- 238000010438 heat treatment Methods 0.000 claims abstract description 39
- 238000010079 rubber tapping Methods 0.000 claims abstract description 19
- 239000000498 cooling water Substances 0.000 claims description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 238000005097 cold rolling Methods 0.000 abstract description 10
- 230000002159 abnormal effect Effects 0.000 abstract description 7
- 229910052840 fayalite Inorganic materials 0.000 description 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 7
- 238000009825 accumulation Methods 0.000 description 5
- 238000010304 firing Methods 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 229910052909 inorganic silicate Inorganic materials 0.000 description 2
- 229910052609 olivine Inorganic materials 0.000 description 2
- 239000010450 olivine Substances 0.000 description 2
- 229910000885 Dual-phase steel Inorganic materials 0.000 description 1
- 229910000794 TRIP steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Control Of Metal Rolling (AREA)
Abstract
The embodiment of the invention provides a method and a device for manufacturing cold-rolled high-strength steel, wherein the method comprises the following steps: heating the strip steel slab, controlling the heating tapping temperature to be 1180-1200 ℃, and controlling the heating time to be 180-200 min; carrying out rough rolling on the heated strip steel plate blank, and controlling the rough rolling temperature to be 980-1000 ℃; carrying out finish rolling on the rough-rolled strip steel plate blank, and controlling the finish rolling temperature to be 860-880 ℃; carrying out laminar flow cooling on the finish-rolled strip steel plate blank, wherein in the laminar flow cooling process, the cooling collecting pipe of the main cooling area is controlled to be in an open state, and the cooling collecting pipe of the feedback area is controlled to be in a closed state; therefore, the main cooling area cooling header is controlled to be in an open state and the feedback area cooling header is controlled to be in a closed state in the laminar cooling process, abnormal feedback adjustment caused by temperature fluctuation can be avoided, the control precision of the strip steel coiling temperature is further improved, severe fluctuation of the coiling temperature is avoided, and the stability of cold rolling in the subsequent process is ensured.
Description
Technical Field
The invention belongs to the technical field of steel production, and particularly relates to a method and a device for manufacturing cold-rolled high-strength steel.
Background
In the technical field of steel production, silicon is a common element for improving the hardenability of steel and the strength of finished products, and the existing cold-rolled high-strength steel mainly adopts dual-phase steel and TRIP steel and contains a high-content silicon component, but the addition of the silicon component causes serious red rust defects on the surface of strip steel, and finally influences the use of customers. In order to solve the problem of surface red rust, a process system of low-temperature coiling is required to be executed in production, but the strip steel after water cooling has poor plate shape quality in the whole length, the coiling temperature fluctuation is severe, the error with the target coiling temperature is too large, and the stability of cold rolling in the subsequent process is influenced.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a method and a device for manufacturing cold-rolled high-strength steel, which are used for solving the technical problem that the stability of cold-rolling in the subsequent process cannot be ensured due to severe low-temperature coiling temperature fluctuation when the cold-rolled high-strength steel is produced in the prior art.
The embodiment of the invention provides a method for manufacturing cold-rolled high-strength steel, which comprises the following steps:
heating the strip steel slab, controlling the heating tapping temperature to be 1180-1200 ℃, and controlling the heating time to be 180-200 min;
carrying out rough rolling on the heated strip steel plate blank, and controlling the rough rolling temperature to be 980-1000 ℃;
carrying out finish rolling on the rough-rolled strip steel plate blank, and controlling the finish rolling temperature to be 860-880 ℃;
and carrying out laminar flow cooling on the finish-rolled strip steel plate blank, wherein in the laminar flow cooling process, the cooling collecting pipe of the main cooling area is controlled to be in an open state, and the cooling collecting pipe of the feedback area is controlled to be in a closed state.
In the above scheme, the finish rolling of the rough rolled strip steel slab includes: in the finish rolling process, the preset cooling water flow between all stand frames is controlled to be 40-60%; controlling the running speed of the strip steel to be more than 8 m/s.
In the above scheme, after control the cooling water flow that predetermines between the finishing mill frame is 40 ~ 60% in the rolling process, still include:
and dynamically adjusting the preset cooling water flow among the frames according to a preset water flow adjusting range by taking the finish rolling temperature as a reference.
In the above scheme, the preset water flow adjustment range is as follows: 20-80%.
In the above scheme, in the laminar flow cooling process, controlling the main cooling area header to be in an open state includes:
in each group of cooling headers of the main cooling area, controlling the opening ratio of the upper header to the lower header of each group of cooling headers to be 3: 4; each set of headers includes: an upper header and a lower header.
In the scheme, the strip steel slab comprises the following components in percentage by mass: c: 0.08-0.13%; si: 1.1-1.4%; mn: 1.4-2.0%; al: 0.02-0.065%; p ≦ 0.020%.
The embodiment of the invention also provides a device for manufacturing the cold-rolled high-strength steel, which comprises the following components:
the first control unit is used for controlling the heating tapping temperature to be 1180-1200 ℃ and the heating time to be 180-200 min when the strip steel slab is heated;
the second control unit is used for carrying out rough rolling on the heated strip steel plate blank, and the rough rolling temperature is controlled to be 980-1000 ℃;
the third control unit is used for performing finish rolling on the rough-rolled strip steel plate blank, and controlling the finish rolling temperature to be 860-880 ℃;
and the fourth control unit is used for controlling the main cooling area cooling collecting pipe to be in an open state and controlling the feedback area cooling collecting pipe to be in a closed state in the process of carrying out laminar cooling on the finish-rolled strip steel plate blank.
In the foregoing solution, the third control unit is specifically configured to: controlling the flow of cooling water between the finishing mill frames to be 40-60%; controlling the running speed of the strip steel to be more than 8 m/s.
In the foregoing solution, the third control unit is specifically configured to:
and dynamically adjusting the preset cooling water flow among the frames according to a preset water flow adjusting range by taking the finish rolling temperature as a reference.
In the foregoing solution, the fourth control unit is specifically configured to:
in each group of cooling headers of the main cooling area, controlling the opening ratio of the upper header to the lower header of each group of cooling headers to be 3: 4; each set of headers includes: an upper header and a lower header.
The embodiment of the invention provides a method and a device for manufacturing cold-rolled high-strength steel, wherein the method comprises the following steps: heating the strip steel slab, controlling the heating tapping temperature to be 1180-1200 ℃, and controlling the heating time to be 180-200 min; carrying out rough rolling on the heated strip steel plate blank, and controlling the rough rolling temperature to be 980-1000 ℃; carrying out finish rolling on the rough-rolled strip steel plate blank, and controlling the finish rolling temperature to be 860-880 ℃; carrying out laminar flow cooling on the finish-rolled strip steel plate blank, wherein in the laminar flow cooling process, the cooling collecting pipe of the main cooling area is controlled to be in an open state, and the cooling collecting pipe of the feedback area is controlled to be in a closed state; therefore, the heating tapping temperature is controlled to be 1180-1200 ℃, and the heating time is controlled to be 180-200 min, so that the olivine phase Fe can be effectively reduced2SiO4The thickness of the generated strip steel in the heating furnace; by controlling the rough rolling outlet temperature, the cooling header of the main cooling area is controlled to be in an open state and the cooling header of the feedback area is controlled to be in a closed state in the laminar cooling process, so that abnormal feedback adjustment caused by temperature fluctuation can be avoided, the control precision of the strip steel coiling temperature is improved, the severe fluctuation of the coiling temperature is avoided, and the stability of cold rolling in the subsequent process is ensured.
Drawings
FIG. 1 is a schematic flow chart of a method for manufacturing cold-rolled high-strength steel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an apparatus for manufacturing cold-rolled high-strength steel according to a second embodiment of the present invention.
Detailed Description
In order to solve the technical problem that the stability of cold rolling in the subsequent process cannot be ensured due to severe low-temperature coiling temperature fluctuation when cold-rolled high-strength steel is produced in the prior art, the invention provides a method and a device for manufacturing the cold-rolled high-strength steel, wherein the method comprises the following steps of: heating the strip steel slab, controlling the heating tapping temperature to be 1180-1200 ℃, and controlling the heating time to be 180-200 min; carrying out rough rolling on the heated strip steel plate blank, and controlling the rough rolling temperature to be 980-1000 ℃; carrying out finish rolling on the rough-rolled strip steel plate blank, and controlling the finish rolling temperature to be 860-880 ℃; and carrying out laminar flow cooling on the finish-rolled strip steel plate blank, wherein in the laminar flow cooling process, the cooling collecting pipe of the main cooling area is controlled to be in an open state, and the cooling collecting pipe of the feedback area is controlled to be in a closed state.
The technical solution of the present invention is further described in detail by the accompanying drawings and the specific embodiments.
Example one
The present embodiment provides a method of manufacturing cold-rolled high-strength steel, as shown in fig. 1, the method including:
s101, heating the strip steel slab, controlling the heating tapping temperature to be 1180-1200 ℃, and controlling the heating time to be 180-200 min;
in the step, the band steel plate blank is heated by adopting the processes of quick firing and low-temperature tapping, and in order to comprehensively consider the fayalite phase Fe2SiO4The heating tapping temperature is controlled to be 1180-1200 ℃, and the preferable temperature is as follows: 1190 to 1200 ℃; the heating time is controlled to be 180-200 min, preferably 185-195 min. The strip steel slab comprises the following components in percentage by mass: c: 0.08-0.13%; si: 1.1-1.4%; mn: 1.4-2.0%; al: 0.02-0.065%; p ≦ 0.020%.
S102, roughly rolling the heated strip steel plate blank, and controlling the rough rolling temperature to be 980-1000 ℃;
and then carrying out semi-continuous rough rolling on the heated strip steel plate blank, wherein in order to reduce the generation of red rust in the rolling process and ensure the finish rolling threading speed, the rough rolling temperature is controlled to be 980-1000 ℃, and preferably: 985-995 ℃.
S103, performing finish rolling on the rough-rolled strip steel plate blank, and controlling the finish rolling temperature to be 860-880 ℃;
then, carrying out finish rolling on the rough-rolled strip steel plate blank by using a finish rolling frame, and controlling the finish rolling temperature to be 860-880 ℃, preferably 865-875 ℃; specifically, in the finish rolling process, the cooling water flow preset among all stand frames in finish rolling is controlled to be 40-60%; the running speed of the strip steel is controlled to be more than 8m/s, so that the water-cooling plate shape of the strip steel and the uneven cooling phenomenon of the strip steel are improved.
The operating speeds include: threading speed and rolling speed, wherein both the threading speed and the rolling speed are more than 8 m/s.
In the rolling process, the finish rolling temperature is used as a reference, and the preset cooling water flow among all the racks is dynamically adjusted according to a preset water flow adjusting range, so that the finish rolling temperature can be controlled to be 860-880 ℃ finally; wherein, the preset water flow adjusting range is as follows: 20-80%, that is, in the rolling process, the adjusting range of the opening degree of the cooling water valve set between the frames is 20-80%.
It should be noted that, in the present embodiment, six inter-stand cooling water valve groups are included, but in the present embodiment, 4 to 5 inter-stand cooling water valve groups are generally opened, 2 inter-stand cooling water valve groups close to the outlet of the finish rolling stand are controlled to be in an opened state, and 2 to 3 inter-stand cooling water valve groups close to the inlet of the finish rolling stand are controlled to be in an opened state.
And S104, carrying out laminar flow cooling on the finish-rolled strip steel plate blank, wherein in the laminar flow cooling process, the cooling collecting pipe of the main cooling area is controlled to be in an open state, and the cooling collecting pipe of the feedback area is controlled to be in a closed state.
In the step, laminar cooling needs to be performed on the finish-rolled strip steel plate blank, and in the laminar cooling process, the cooling collecting pipe of the main cooling area is controlled to be in an open state, and the cooling collecting pipe of the feedback area is controlled to be in a closed state.
Specifically, the laminar flow cooling in the embodiment comprises 20 cooling header groups, and the number of the main cooling area cooling header groups is 1-18; the number of the feedback area cooling headers is 19-20; each group all includes: an upper header and a lower header. The upper collecting pipe is positioned above the upper surface of the strip steel, and the lower collecting pipe is positioned below the lower surface of the strip steel.
Here, in each group of cooling headers in the main cooling area, the opening ratio of the upper header to the lower header of each group of cooling headers is controlled to be 3: 4; for example, when the number of the upper header and the lower header in each group of cooling headers is 4, the number of the upper header is 3, and the number of the lower header is 4.
It should be noted that the groups of cooling headers in the main cooling area are not simultaneously opened, but are sequentially opened in sequence. Thus, a centralized cooling mode with the water-to-water ratio of 3:4 is adopted, the cooling rate of the upper surface of the strip steel is reduced, the warping phenomenon of the side parts at two sides is improved, and further the phenomenon of temperature fluctuation caused by water accumulation of the strip steel is avoided. And the cooling header in the feedback area is controlled to be in a closed state, so that abnormal feedback adjustment caused by temperature fluctuation can be avoided, the control precision of the strip steel coiling temperature is improved, the severe fluctuation of the coiling temperature is avoided, and the stability of cold rolling in the subsequent process is ensured.
Example two
In accordance with a first embodiment, the present embodiment provides an apparatus for manufacturing cold-rolled high-strength steel, as shown in fig. 2, the apparatus including: a first control unit 21, a second control unit 22, a third control unit 23, and a fourth control unit 24; wherein,
the strip steel slab is heated by adopting the processes of quick firing and low-temperature tapping, and in order to comprehensively consider the fayalite phase Fe2SiO4The first control unit 21 is configured to control the heating tapping temperature to 1180-1200 ℃ when the strip steel slab is heated, and preferably: 1190 to 1100 ℃; the heating time is controlled to be 180-200 min, preferably 185-195 min.
The strip steel slab comprises the following components in percentage by mass: c: 0.08-0.13%; si: 1.1-1.4%; mn: 1.4-2.0%; al: 0.02-0.065%; p ≦ 0.020%.
In order to reduce the generation of red rust in the rolling process and ensure the finish rolling threading speed, the second control unit 22 is configured to perform rough rolling on the heated strip steel plate blank, control the rough rolling temperature to be 980-1000 ℃, and preferably: 985-995 ℃.
Then, a finish rolling frame is used for finish rolling the rough rolled strip steel plate blank, and a third control unit 23 is used for finish rolling the rough rolled strip steel plate blank, and the finish rolling temperature is controlled to be 860-880 ℃; specifically, in the finish rolling process, the cooling water flow preset among all stand frames in finish rolling is controlled to be 40-60%; the running speed of the strip steel is controlled to be more than 8m/s, so that the water-cooling plate shape of the strip steel and the uneven cooling phenomenon of the strip steel are improved.
The operating speeds include: threading speed and rolling speed, wherein both the threading speed and the rolling speed are more than 8 m/s.
In the rolling process, the third control unit 23 further needs to dynamically adjust the preset cooling water flow among the racks according to a preset water flow adjustment range by taking the finish rolling temperature as a reference, so that the finish rolling temperature can be finally controlled to be 860 to 880 ℃; wherein, the preset water flow adjusting range is as follows: 20-80%, that is, in the rolling process, the adjusting range of the opening degree of the cooling water valve set between the frames is 20-80%.
It should be noted that, in the present embodiment, six inter-stand cooling water valve groups are included, but in the present embodiment, 4 to 5 inter-stand cooling water valve groups are generally opened, 2 inter-stand cooling water valve groups close to the outlet of the finish rolling stand are controlled to be in an opened state, and 2 to 3 inter-stand cooling water valve groups close to the inlet of the finish rolling stand are controlled to be in an opened state.
The fourth control unit 24 is configured to control the main cooling zone cooling header to be in an open state and the feedback zone cooling header to be in a closed state in the process of performing laminar cooling on the finish-rolled strip steel slab.
Specifically, the laminar flow cooling in the embodiment comprises 20 cooling header groups, and the number of the main cooling area cooling header groups is 1-18; the number of the feedback area cooling headers is 19-20; each group all includes: an upper header and a lower header. The upper collecting pipe is positioned above the upper surface of the strip steel, and the lower collecting pipe is positioned below the lower surface of the strip steel.
Here, in each group of cooling headers of the main cooling zone, the fourth control unit 24 controls the opening ratio of the upper header to the lower header of each group to be 3: 4; for example, when the number of the upper header and the lower header in each group of cooling headers is 4, the number of the upper header is 3, and the number of the lower header is 4.
It should be noted that the groups of cooling headers in the main cooling area are not simultaneously opened, but are sequentially opened in sequence. Thus, a centralized cooling mode with the water-to-water ratio of 3:4 is adopted, the cooling rate of the upper surface of the strip steel is reduced, the warping phenomenon of the side parts at two sides is improved, and further the phenomenon of temperature fluctuation caused by water accumulation of the strip steel is avoided. And the cooling header in the feedback area is controlled to be in a closed state, so that abnormal feedback adjustment caused by temperature fluctuation can be avoided, the control precision of the strip steel coiling temperature is improved, the severe fluctuation of the coiling temperature is avoided, and the stability of cold rolling in the subsequent process is ensured.
EXAMPLE III
In practical application, when the cold-rolled high-strength steel CR420/780DP is manufactured according to the method and the device provided by the first embodiment and the second embodiment, the specific implementation is as follows:
here, the strip steel slab comprises, in mass percent: c: 0.08-0.10%; si: 1.1-1.2%; mn: 1.9-2.0%; al: 0.02-0.06%; p ≦ 0.020%.
The strip steel slab is heated by adopting the processes of quick firing and low-temperature tapping, and in order to comprehensively consider the fayalite phase Fe2SiO4The heating tapping temperature is controlled to be 1198 ℃; the heating time was controlled to 192 min.
And then carrying out semi-continuous rough rolling on the heated strip steel plate blank, and controlling the outlet temperature of rough rolling to be 986 ℃ in order to reduce the generation of red rust in the rolling process and ensure the finish rolling threading speed.
Then, carrying out finish rolling on the rough-rolled strip steel plate blank by using a finish rolling machine frame, and controlling the finish rolling temperature to be 870 ℃; specifically, in the finish rolling process, the preset cooling water flow between all stand frames is controlled to be 50%; the running speed of the strip steel is controlled to be 9-11 m/s, so that the water-cooling plate shape of the strip steel and the uneven cooling phenomenon of the strip steel are improved.
The operating speeds include: the threading speed and the rolling speed are both 9m/s and 9-11 m/s.
In the rolling process, the finish rolling temperature is taken as a reference, and the preset cooling water flow among all the racks is dynamically adjusted according to a preset water flow adjusting range, so that the finish rolling temperature can be finally controlled to be 870 ℃; wherein, the preset water flow adjusting range is as follows: 20-80%, that is, in the rolling process, the adjusting range of the opening degree of the cooling water valve set between the frames is 20-80%.
It should be noted that, in the present embodiment, six inter-stand cooling water valve groups are included, but in the present embodiment, 4 to 5 inter-stand cooling water valve groups are generally opened, and 2 inter-stand cooling water valve groups close to the outlet of the finish rolling stand are controlled to be in an opened state, and 3 inter-stand cooling water valve groups close to the inlet of the finish rolling stand are controlled to be in an opened state.
And finally, carrying out laminar flow cooling on the finish-rolled strip steel plate blank, wherein in the laminar flow cooling process, the cooling collecting pipe of the main cooling area is controlled to be in an open state, and the cooling collecting pipe of the feedback area is controlled to be in a closed state.
Specifically, the laminar flow cooling in the embodiment comprises 20 cooling header groups, and the number of the main cooling area cooling header groups is 1-18; the number of the feedback area cooling headers is 19-20; each group all includes: an upper header and a lower header. The upper collecting pipe is positioned above the upper surface of the strip steel, and the lower collecting pipe is positioned below the lower surface of the strip steel.
Here, in each group of cooling headers in the main cooling area, the opening ratio of the upper header to the lower header of each group of cooling headers is controlled to be 3: 4; for example, when the number of the upper header and the lower header in each group of cooling headers is 4, the number of the upper header is 3, and the number of the lower header is 4. The total number of the upper header 27 and the lower header 34 is preset to be opened.
It should be noted that the groups of cooling headers in the main cooling area are not simultaneously opened, but are sequentially opened in sequence. Thus, a centralized cooling mode with the water-to-water ratio of 3:4 is adopted, the cooling rate of the upper surface of the strip steel is reduced, the warping phenomenon of the side parts at two sides is improved, and further the phenomenon of temperature fluctuation caused by water accumulation of the strip steel is avoided. And the cooling header in the feedback area is controlled to be in a closed state, so that abnormal feedback adjustment caused by temperature fluctuation can be avoided, the control precision of the strip steel coiling temperature is further improved, the severe fluctuation of the coiling temperature is avoided, the coiling temperature is finally ensured to be 540 ℃, and the stability of cold rolling in the subsequent process is ensured.
Example four
In practical application, when the cold-rolled high-strength steel TRIP590P is manufactured according to the method and the device provided by the first embodiment, the following concrete implementation is realized:
here, the strip steel slab comprises, in mass percent: c: 0.11-0.13%; si: 1.1-1.3%; mn: 1.4-1.6%; al: 0.035-0.065%; p ≦ 0.020%.
The strip steel slab is heated by adopting the processes of quick firing and low-temperature tapping, and in order to comprehensively consider the fayalite phase Fe2SiO4The heating tapping temperature is controlled to be 1200 ℃; the heating time was controlled to 198 min.
And then carrying out semi-continuous rough rolling on the heated strip steel plate blank, wherein the rough rolling temperature is controlled to be 1000 ℃ in order to reduce the generation of red rust in the rolling process and ensure the finish rolling threading speed.
Then, a finish rolling frame is utilized to finish the rough-rolled strip steel plate blank, and the finish rolling temperature is controlled to be 875 ℃; specifically, in the finish rolling process, the preset cooling water flow between all stand frames is controlled to be 50%; the running speed of the strip steel is controlled to be 8.5-10.8 m/s, so that the water-cooling plate shape of the strip steel and the uneven cooling phenomenon of the strip steel are improved.
The operating speeds include: the threading speed and the rolling speed are both 8.5m/s and 8.5-10.8 m/s.
In the rolling process, the finish rolling temperature is taken as a reference, and the preset cooling water flow among the frames is dynamically adjusted according to a preset water flow adjusting range, so that the finish rolling temperature can be finally controlled to be 875 ℃; wherein, the preset water flow adjusting range is as follows: 20-80%, that is, in the rolling process, the adjusting range of the opening degree of the cooling water valve set between the frames is 20-80%.
It should be noted that, in the present embodiment, six inter-stand cooling water valve groups are included, but in the present embodiment, 4 to 5 inter-stand cooling water valve groups are generally opened, and 2 inter-stand cooling water valve groups close to the outlet of the finish rolling stand are controlled to be in an opened state, and 3 inter-stand cooling water valve groups close to the inlet of the finish rolling stand are controlled to be in an opened state.
Laminar flow cooling needs to be carried out on the finish-rolled strip steel plate blank, and in the laminar flow cooling process, the cooling collecting pipe of the main cooling area is controlled to be in an open state, and the cooling collecting pipe of the feedback area is controlled to be in a closed state.
Specifically, the laminar flow cooling in the embodiment comprises 20 cooling header groups, and the number of the main cooling area cooling header groups is 1-18; the number of the feedback area cooling headers is 19-20; each group all includes: an upper header and a lower header. The upper collecting pipe is positioned above the upper surface of the strip steel, and the lower collecting pipe is positioned below the lower surface of the strip steel.
Here, in each group of cooling headers in the main cooling area, the opening ratio of the upper header to the lower header of each group of cooling headers is controlled to be 3: 4; for example, when the number of the upper header and the lower header in each group of cooling headers is 4, the number of the upper header is 3, and the number of the lower header is 4. In this embodiment, 12 upper headers and 16 lower headers are preset to be opened, and it should be noted that the cooling headers of the groups in the main cooling area are not opened simultaneously, but are opened sequentially. Thus, a centralized cooling mode with the water-to-water ratio of 3:4 is adopted, the cooling rate of the upper surface of the strip steel is reduced, the warping phenomenon of the side parts at two sides is improved, and further the phenomenon of temperature fluctuation caused by water accumulation of the strip steel is avoided. And the cooling header in the feedback area is controlled to be in a closed state, so that abnormal feedback adjustment caused by temperature fluctuation can be avoided, the control precision of the strip steel coiling temperature is further improved, the severe fluctuation of the coiling temperature is avoided, the coiling temperature is finally ensured to be 550 ℃, and the stability of cold rolling in the subsequent process is ensured.
The method and the device for manufacturing the cold-rolled high-strength steel provided by the embodiment of the invention have the following beneficial effects that:
the embodiment of the invention providesA method and apparatus for manufacturing cold rolled high strength steel, the method comprising: heating the strip steel slab, controlling the heating tapping temperature to be 1180-1200 ℃, and controlling the heating time to be 180-200 min; rough rolling is carried out on the heated strip steel plate blank, the rough rolling temperature is controlled to be 980-1000 ℃, and the generation of red rust in the rolling process is reduced; carrying out finish rolling on the rough-rolled strip steel plate blank, and controlling the finish rolling temperature to be 860-880 ℃; carrying out laminar flow cooling on the finish-rolled strip steel plate blank, wherein in the laminar flow cooling process, the cooling collecting pipe of the main cooling area is controlled to be in an open state, and the cooling collecting pipe of the feedback area is controlled to be in a closed state; therefore, the heating tapping temperature is controlled to be 1180-1200 ℃, and the heating time is controlled to be 180-200 min, so that the olivine phase Fe can be effectively reduced2SiO4The thickness of the generated strip steel in the heating furnace; by controlling the rough rolling outlet temperature, the cooling header of the main cooling area is controlled to be in an open state and the cooling header of the feedback area is controlled to be in a closed state in the laminar cooling process, the cooling rate of the upper surface of the strip steel is reduced, the warping phenomenon of the edges of two sides is improved, the water accumulation of the strip steel can be avoided, the abnormal feedback adjustment caused by temperature fluctuation is avoided, the control precision of the strip steel coiling temperature is improved, the severe fluctuation of the coiling temperature is avoided, and the stability of the cold rolling of the subsequent procedures is ensured.
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 (3)
1. A method of manufacturing cold rolled high strength steel, the method comprising:
heating the strip steel slab, controlling the heating tapping temperature to be 1180-1200 ℃, and controlling the heating time to be 180-200 min;
carrying out rough rolling on the heated strip steel plate blank, and controlling the rough rolling temperature to be 980-1000 ℃;
carrying out finish rolling on the rough-rolled strip steel plate blank, and controlling the finish rolling temperature to be 860-880 ℃; in the finish rolling process, the preset cooling water flow between all stand frames is controlled to be 40-60%; controlling the running speed of the strip steel to be more than 8 m/s; dynamically adjusting the preset cooling water flow among the frames according to a preset water flow adjusting range by taking the finish rolling temperature as a reference; the preset water flow adjusting range is as follows: 20-80%;
carrying out laminar flow cooling on the finish-rolled strip steel plate blank, wherein in the laminar flow cooling process, each group of cooling collecting pipes in a main cooling area are controlled to be in an open state, and each group of cooling collecting pipes in a feedback area are controlled to be in a closed state; the sets of manifolds of the primary cooling zone and the feedback zone comprise: an upper header and a lower header; in each group of cooling headers of the main cooling area, the opening ratio of the upper header to the lower header of each group of cooling headers is controlled to be 3: 4.
2. The method of claim 1, wherein the strip steel slab comprises the following components in percentage by mass: c: 0.08-0.13%; si: 1.1-1.4%; mn: 1.4-2.0%; al: 0.02-0.065%; p is less than or equal to 0.020%.
3. An apparatus for manufacturing cold rolled high strength steel, comprising:
the first control unit is used for controlling the heating tapping temperature to be 1180-1200 ℃ and the heating time to be 180-200 min when the strip steel slab is heated;
the second control unit is used for carrying out rough rolling on the heated strip steel plate blank, and the rough rolling temperature is controlled to be 980-1000 ℃;
the third control unit is used for performing finish rolling on the rough-rolled strip steel plate blank, and controlling the finish rolling temperature to be 860-880 ℃;
the fourth control unit is used for controlling the main cooling area cooling collecting pipe to be in an open state and controlling the feedback area cooling collecting pipe to be in a closed state in the process of carrying out laminar cooling on the finish-rolled strip steel plate blank;
the third control unit is specifically configured to: controlling the flow of cooling water between the finishing mill frames to be 40-60%; controlling the running speed of the strip steel to be more than 8 m/s; dynamically adjusting the preset cooling water flow among the frames according to a preset water flow adjusting range by taking the finish rolling temperature as a reference;
the sets of manifolds of the primary cooling zone and the feedback zone comprise: an upper header and a lower header; the fourth control unit is specifically configured to: in each group of cooling headers of the main cooling area, the opening ratio of the upper header to the lower header of each group of cooling headers is controlled to be 3: 4.
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| CN112207138B (en) * | 2020-09-25 | 2022-08-05 | 攀钢集团西昌钢钒有限公司 | Method for stably controlling finish rolling temperature of high-grade pipeline steel |
| CN113059003B (en) * | 2021-03-01 | 2023-07-21 | 首钢京唐钢铁联合有限责任公司 | Method for controlling cold-rolled high-strength steel acid edging crack |
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