CN109702022B - Method for preventing medium-high carbon steel hot-rolled steel coil from generating flat contusion defect - Google Patents
Method for preventing medium-high carbon steel hot-rolled steel coil from generating flat contusion defect Download PDFInfo
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- CN109702022B CN109702022B CN201910066837.9A CN201910066837A CN109702022B CN 109702022 B CN109702022 B CN 109702022B CN 201910066837 A CN201910066837 A CN 201910066837A CN 109702022 B CN109702022 B CN 109702022B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 166
- 239000010959 steel Substances 0.000 title claims abstract description 166
- 238000000034 method Methods 0.000 title claims abstract description 45
- 208000034656 Contusions Diseases 0.000 title claims abstract description 30
- 230000009519 contusion Effects 0.000 title claims abstract description 30
- 230000007547 defect Effects 0.000 title claims abstract description 18
- 229910000677 High-carbon steel Inorganic materials 0.000 title claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 51
- 238000005096 rolling process Methods 0.000 claims abstract description 25
- 230000009466 transformation Effects 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 18
- 230000008859 change Effects 0.000 claims description 15
- 229910001566 austenite Inorganic materials 0.000 claims description 10
- 229910001562 pearlite Inorganic materials 0.000 claims description 9
- 239000002436 steel type Substances 0.000 claims description 5
- 229910000859 α-Fe Inorganic materials 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 11
- 229910000975 Carbon steel Inorganic materials 0.000 description 8
- 238000010583 slow cooling Methods 0.000 description 8
- 239000012535 impurity Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000009749 continuous casting Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000004781 supercooling Methods 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 102220005308 rs33960931 Human genes 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The invention provides a method for preventing a medium-high carbon steel hot rolled steel coil from generating flattening contusion defects, which comprises the procedures of rough rolling of strip steel, finish rolling, laminar cooling, coiling into a steel coil, air cooling of the steel coil and flattening; and when the temper mill levels, reduce tension before the decoiler and tension behind the rolling machine, reduce and level the speed, avoid coil of strip when leveling to lead to leveling the contusion because of producing the friction between coil of strip layer and the layer under the effect of tension, improve the surface quality of coil of strip, reduce the quality risk.
Description
Technical Field
The invention belongs to the technical field of hot-rolled strip steel production processes, and particularly relates to a method for preventing a medium-high carbon steel hot-rolled steel coil from generating a flat contusion defect.
Background
The thin medium-high carbon steel hot rolled steel coil is generally used after acid washing or cold rolling, and is widely applied to tools or measuring tools such as automobile parts, art designing blades, scissors, steel rulers and the like, and the requirements of the applications on the surface quality of the hot rolled steel coil are very high.
Because the carbon content of medium-high carbon steel is high, a certain amount of alloy or microalloy elements are added to part of grades, and the conventional process generally adopts an air cooling or water cooling and high-temperature coiling mode to produce the hot-rolled strip steel so as to reduce the hardness of the strip steel. Under the process conditions, the produced medium-high carbon steel hot rolled steel coil basically generates the transformation from austenite to ferrite and pearlite after being coiled, and the following problems are brought about: (1) the steel coil is dislocated after phase change between layers to cause coil loosening, and when the steel coil is subsequently leveled, friction is generated between the band steel layers under the action of tension, so that leveling and contusion phenomena occur; (2) after the steel coil is coiled, phase change occurs in the air at a higher temperature, the iron scale is thicker, and the thicker iron scale is more easily flattened and contused when the flattened layer is rubbed with the layer.
In the aspect of controlling the level contusion and scratch of a steel coil, wuhan steel (group) company applies for chinese patent CN201410199349.2 in 5, month and 12 in 2014, with the patent names: a control method for eliminating the contusion of the finishing surface of a hot-rolled strip steel discloses that the contusion problem is solved by adjusting the coiling temperature of the head (1-3m) of the strip steel and adjusting the technological parameters during leveling, the thickness of the strip steel is less than 2mm, and the steel is ordinary carbon or low carbon steel and is not suitable for medium-high carbon steel. Chinese patent CN201410268624.1, filed by beijing first steel limited on 16/06/2014, with patent names: the method and the device for preventing the scratch defect of the strip steel in the leveling process of the leveling machine solve the leveling scratch problem by singly adjusting the parameters of the leveling machine, mainly aim at the thin-gauge cold-rolled strip with low strength and high elongation rate, and are not suitable for hot-rolled steel coils.
Therefore, it is necessary to develop a technology for preventing the medium-high carbon hot rolled steel coil from generating the flat contusion defect.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for preventing a medium-high carbon steel hot rolled steel coil from generating a flat contusion defect, which can prevent the flat contusion problem caused by friction between steel coil layers under the action of tension when the steel coil is flat, improve the surface quality of the steel coil and reduce the quality risk of the steel coil.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for preventing a medium-high carbon steel hot rolled steel coil from generating a flat contusion defect comprises the procedures of rough rolling of strip steel, finish rolling, laminar cooling, coiling into a steel coil, air cooling of the steel coil and flattening, wherein the front section of laminar cooling is adopted;
the parameter setting method of the laminar cooling process comprises the following steps:
according to a supercooling austenite isothermal transformation curve (TTT curve) of the steel type of the strip steel, determining the nose temperature point temperature of the strip steel and the time from the beginning phase transformation to the end phase transformation of the strip steel at the nose temperature point temperature;
the final cooling temperature of the front-section layer cooling is set as the nose temperature of the strip steel, and the time from the end of the front-section layer cooling to the coiling temperature measuring point is set to be more than or equal to the time from the beginning to the end of the phase change of the strip steel at the nose temperature;
the parameters of the leveling procedure are set as follows:
the front tension is set to be 80-100 KN, the rear tension is set to be 180-200 KN, and the leveling speed is set to be 80-100 m/min.
Preferably, the coiling temperature of the strip steel is set to be 550-630 ℃, and the coiling tension of the strip steel is 20-40 MPa.
Preferably, the finishing temperature is set to 800-900 ℃.
Preferably, the thickness of the strip steel is 1.2-3.5 mm, and the width of the strip steel is 900-1600 mm.
Compared with the prior art, the invention has the following beneficial effects:
according to the supercooled austenite isothermal transformation curve (TTT curve) of the steel type, the nose temperature of the strip steel and the time from the beginning of phase transformation to the end of phase transformation under the nose temperature are determined, and the parameters of laminar cooling are set according to the data, so that the strip steel is ensured to finish the phase transformation from austenite to pearlite + ferrite (or pearlite) before coiling, the phenomenon that the relative movement between layers of the steel coil and the looseness of the steel coil caused by the phase transformation of the strip steel in the process after coiling is avoided, and the steel coil is prevented from generating the defects of flattening and contusion;
in the leveling process of the leveler, the front tension is set to 80-100 KN, which is equivalent to 60-80% of the front tension of Q235B plain carbon steel with the same specification (width and thickness of strip steel), and the rear tension is set to 180-200 KN, which is equivalent to 80-90% of the rear tension of Q235B plain carbon steel with the same specification (width and thickness of strip steel); the leveling speed is set to be 80-100 m/min, which is equivalent to 70-80% of the leveling speed of Q235B plain carbon steel with the same specification (width and thickness of strip steel). The steel coil is leveled by the leveling machine, wherein the leveling machine comprises an uncoiler and a coiling machine, the front tension of the uncoiler and the rear tension of the coiling machine are reduced, the leveling speed is reduced, and the steel coil is further prevented from generating the flat contusion defect.
The invention simultaneously adjusts the laminar cooling parameters and the parameters of the leveling process, ensures that the strip steel completes phase change before coiling, prevents the strip steel from generating phase change in the process after coiling, reduces the tension before an uncoiler and the tension after a coiling machine when the leveling machine levels, reduces the leveling speed, avoids leveling contusion caused by friction between steel coil layers under the action of the tension when the steel coil is leveled, improves the surface quality of the steel coil, and reduces the quality risk.
Detailed Description
The following detailed description of the embodiments of the present invention is intended to be illustrative, and not to be construed as limiting the invention.
The method for preventing the medium-high carbon steel hot rolled steel coil from generating the flat contusion defect comprises the working procedures of rough rolling of strip steel, finish rolling, laminar cooling, coiling into the steel coil, air cooling of the steel coil and flattening, wherein the front-section laminar cooling is adopted in the laminar cooling;
the parameter setting method of the laminar cooling process comprises the following steps:
according to a supercooling austenite isothermal transformation curve (TTT curve) of the steel type of the strip steel, determining the nose temperature point temperature of the strip steel and the time from the beginning phase transformation to the end phase transformation of the strip steel at the nose temperature point temperature;
the final cooling temperature of the front-section layer cooling is set as the nose temperature of the strip steel, and the time from the end of the front-section layer cooling to the coiling temperature measuring point is set to be more than or equal to the time from the beginning to the end of the phase change of the strip steel at the nose temperature;
the parameters of the leveling procedure are set as follows:
the front tension is set to be 80-100 KN, the rear tension is set to be 180-200 KN, and the leveling speed is set to be 80-100 m/min.
According to the embodiment of the invention, according to a supercooling austenite isothermal transformation curve (TTT curve) of the strip steel, the nose temperature of the steel type and the time from the beginning of phase transformation to the end of phase transformation at the nose temperature are determined, and the parameters of laminar cooling are set according to the data, so that the strip steel is ensured to finish the phase transformation from austenite to pearlite + ferrite (or pearlite) before coiling, the phase transformation of the strip steel in the process after coiling is avoided, the relative movement between layers of the steel coil and the looseness of the steel coil are avoided, and the defect of leveling and contusion of the steel coil is further prevented;
in the leveling process of the leveler, the front tension is set to 80-100 KN, which is equivalent to 60-80% of the front tension of Q235B plain carbon steel with the same specification (width and thickness of strip steel), and the rear tension is set to 180-200 KN, which is equivalent to 80-90% of the rear tension of Q235B plain carbon steel with the same specification (width and thickness of strip steel); the leveling speed is set to be 80-100 m/min, which is equivalent to 70-80% of the leveling speed of Q235B plain carbon steel with the same specification (width and thickness of strip steel). The steel coil is leveled by the leveling machine, wherein the leveling machine comprises an uncoiler and a coiling machine, the front tension of the uncoiler and the rear tension of the coiling machine are reduced, the leveling speed is reduced, and the steel coil is further prevented from generating the flat contusion defect.
The embodiment of the invention simultaneously adjusts the laminar cooling parameters and the leveling process parameters, ensures that the strip steel completes phase change before coiling, avoids the phase change of the strip steel in the process after coiling, reduces the tension before an uncoiler and the tension after a coiling machine when a leveling machine levels, reduces the leveling speed, avoids leveling contusion caused by friction between steel coil layers under the action of the tension when the steel coil is leveled, improves the surface quality of the steel coil, and reduces the quality risk.
The proper finish rolling temperature and coiling temperature can be calculated by adopting a heat transfer equation set and a numerical simulation method according to the finish cooling temperature, the rolling speed, the length of the layer cooling roller way and the temperature change caused by the heat transfer of the strip steel on the layer cooling roller way.
Preferably, the parameters of the winding process are set as follows: the coiling temperature of the strip steel is set to be 550-630 ℃, and the coiling tension of the strip steel is 20-40 MPa.
The coiling temperature is 550-630 ℃, the red return of the strip steel can occur in the process from the termination of laminar cooling to coiling, the strip steel is in contact with a roller way for heat transfer according to the phase change heat of the red return, and the corresponding coiling temperature can be calculated according to the temperature change caused by the heat transfer of the strip steel in three aspects of radiation heat transfer in the air. Compared with the coiling temperature in the prior art, the coiling temperature in the embodiment of the invention is much lower, the oxide film on the surface of the steel coil is thinner, and the contusion phenomenon of the steel coil is much lighter than that in the prior art even if the steel coil is dislocated between layers.
And the coiling tension of the strip steel is 20-40 MPa, the coiling tension is improved by 110% -125% of Q235B plain carbon steel in the same specification (such as the width and thickness of the strip steel), so that the steel coil layers are tighter, and the steel coil is prevented from loosening during flat uncoiling.
Preferably, the finish rolling temperature is set to 800-900 ℃, the finish rolling temperature can be adjusted according to the TTT curve of the steel grade, and the phase transformation from austenite to pearlite + ferrite (or pearlite) of the strip steel is further ensured to be completed before coiling.
Preferably, the coil is air cooled to below 60 ℃.
According to the embodiment of the invention, by adjusting the technological parameters of finish rolling, coiling temperature, laminar cooling and flattening of hot rolling, the problem of surface contusion defect of the medium-high carbon steel hot rolled steel coil in the flattening process is solved, the surface quality and yield of the steel coil are improved, and meanwhile, the method has certain effects of reducing the thickness of the iron scale on the surface of the strip steel and improving the performance uniformity of the steel coil.
In the embodiments, the strip steel comprises the following chemical components in percentage by weight: c: 0.3% -1.2%, Si: 0.1-0.50%, Mn: 0.1% -1.4%, P: less than or equal to 0.02 percent, S: not more than 0.02%, Cr + Ni + Mo: less than or equal to 2.0 percent, Al: less than or equal to 0.06 percent, and the balance of Fe and inevitable impurities; the thickness of the strip steel is 1.2-3.5 mm, and the width of the strip steel is 900-1600 mm.
The invention is further illustrated by the following specific examples:
example 1
An SK85 continuous casting plate blank is used as a raw material, and is subjected to rough rolling, finish rolling and laminar cooling, and then the hot rolled steel coil is coiled. The strip steel comprises the following chemical components in percentage by mass: 0.861% of C, 0.213% of Si, 0.405% of Mn, 0.012% of P, 0.0028% of S, 0.012% of Al, 0.0009% of Ca, and the balance of Fe and inevitable impurities. The specification of the strip steel is 2.5mm in thickness and 1350mm in width.
The finishing temperature of the strip steel is 900 ℃, the laminar cooling is the front-stage cooling, the finishing temperature of the front-stage cooling is 570 ℃, the time from the finishing cooling to the coiling temperature measuring point of the strip steel is 5s, the coiling temperature is set to be 590 ℃, and the coiling tension of the strip steel is set to be 25MPa which is 110 percent of the same specification Q235B. And after the steel coil is coiled, placing the steel coil into a slow cooling pit for slow cooling, and after the steel coil is cooled to normal temperature, leveling the steel coil on a leveling machine. Setting the front tension of the uncoiler to be 60 percent of that of the same specification Q235B and 80 KN; the back tension was 72% of Q235B and was 180 KN; the leveling speed was 70% of that of Q235B which is the same specification, and was 100 m/min.
And obtaining the SK85 fine roll with smooth surface, bright surface and no smooth contusion after flattening.
Example 2
The method comprises the steps of taking a 65Mn continuous casting plate blank as a raw material, carrying out rough rolling, finish rolling and laminar cooling, and then coiling into a hot rolled steel coil. The strip steel comprises the following chemical components in percentage by mass: 0.670% of C, 0.254% of Si, 1.016% of Mn, 0.013% of P, 0.0021% of S, 0.023% of Al, 0.0011% of Ca and the balance of Fe and inevitable impurities. The specification of the strip steel is 3.0mm in thickness and 1600mm in width.
The finish rolling temperature of the strip steel is 850 ℃, the finish cooling temperature of the laminar flow front-stage cooling is 580 ℃, the time from the finish cooling to the coiling temperature measuring point of the strip steel is 6.5s, the coiling temperature is 600 ℃, and the coiling tension of the strip steel is 125 percent of that of the same specification Q235B and is 38 MPa. And after the steel coil is coiled, placing the steel coil into a slow cooling pit for slow cooling, and after the steel coil is cooled to normal temperature, leveling the steel coil on a leveling machine. Setting the front tension of the uncoiler to be 80 percent of that of the same specification Q235B and 100 KN; the back tension was 68% of Q235B at 200 KN; the leveling speed was 70% of that of Q235B which is the same specification, and was 80 m/min.
And obtaining the bright and smooth 65Mn finished roll with no smooth contusion on the surface after flattening.
Example 3
And taking the S50C continuous casting slab as a raw material, and coiling the raw material into a hot rolled steel coil after rough rolling, finish rolling and laminar cooling. The strip steel comprises the following chemical components in percentage by mass: 0.522% of C, 0.235% of Si, 0.753% of Mn, 0.015% of P, 0.0025% of S, 0.018% of Al, 0.153% of Cr, 0.0009% of Ca and the balance of Fe and inevitable impurities. The specification of the strip steel is 1.5mm in thickness and 1200mm in width.
The finishing temperature of the strip steel is 900 ℃, the finishing temperature of the laminar flow front cooling is 600 ℃, the time from the finishing cooling to the coiling temperature measuring point of the strip steel is 3.5s, the coiling temperature is 600 ℃, and the coiling tension of the strip steel is 22MPa which is 110 percent of the same specification Q235B. And after the steel coil is coiled, placing the steel coil into a slow cooling pit for slow cooling, and after the steel coil is cooled to normal temperature, leveling the steel coil on a leveling machine. Setting the front tension of the uncoiler to be 60 percent of that of the same specification Q235B and 80 KN; the back tension was 74% of Q235B, and was 180 KN; the leveling speed was 70% of that of Q235B which is the same specification, and was 100 m/min.
And obtaining the bright and smooth S50C fine roll with no smooth contusion on the surface after flattening.
Example 4
The method comprises the steps of taking a 30CrMo continuous casting plate blank as a raw material, carrying out rough rolling, finish rolling and laminar cooling, and then coiling into a hot rolled steel coil. The strip steel comprises the following chemical components in percentage by mass: 0.308% of C, 0.235% of Si, 0.614% of Mn, 0.976% of Cr, 0.188% of Mo0.011% of P, 0.0020% of S, 0.024% of Al, 0.0018% of Ca and the balance of Fe and inevitable impurities. The specification of the strip steel is 3.0mm in thickness and 1300mm in width.
The finishing temperature of the strip steel is 900 ℃, the finishing temperature of the laminar flow front cooling is 600 ℃, the time from the finishing cooling to the coiling temperature measuring point of the strip steel is 5s, the coiling temperature is 610 ℃, and the coiling tension of the strip steel is 31MPa which is 125 percent of that of the same specification Q235B. And after the steel coil is coiled, placing the steel coil into a slow cooling pit for slow cooling, and after the steel coil is cooled to normal temperature, leveling the steel coil on a leveling machine. Setting the front tension of the uncoiler to be 80 percent of that of the same specification Q235B and 100 KN; the back tension was 80% of Q235B and was 220 KN; the leveling speed was 80% of that of Q235B, which is the same specification, and was 100 m/min.
And obtaining the bright and smooth 30CrMo finished roll with no smooth contusion on the surface after flattening.
The present invention is not limited to the above preferred embodiments, and any modification, equivalent replacement and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A method for preventing a medium-high carbon steel hot rolled steel coil from generating a flat contusion defect is characterized by comprising the working procedures of rough rolling of strip steel, finish rolling, laminar cooling, coiling into a steel coil, air cooling of the steel coil and flattening, wherein the laminar cooling adopts front-section laminar cooling;
the parameter setting method of the laminar cooling process comprises the following steps:
determining the nose temperature point temperature of the strip steel and the time from the beginning phase change to the end phase change of the strip steel at the nose temperature point temperature according to the super-cooled austenite isothermal transformation curve of the steel grade of the strip steel;
the final cooling temperature of the front-section layer cooling is set as the nose temperature of the strip steel, and the time from the end of the front-section layer cooling to the coiling temperature measuring point is set to be more than or equal to the time from the beginning phase change to the end phase change of the strip steel at the nose temperature;
the parameters of the leveling procedure are set as follows:
the front tension is set to be 80-100 KN, the rear tension is set to be 180-200 KN, and the leveling speed is set to be 80-100 m/min.
2. The method for preventing the medium-high carbon steel hot-rolled steel coil from generating the flat contusion defect as claimed in claim 1, wherein the parameters of the coiling process are set as follows: the coiling temperature of the strip steel is set to be 550-630 ℃, and the coiling tension of the strip steel is 20-40 MPa.
3. The method for preventing the medium-high carbon steel hot-rolled steel coil from generating the flattening contusion defect according to claim 1, wherein the finish rolling temperature is set to 800-900 ℃, the finish rolling temperature is adjusted according to the TTT curve of the steel type, and the phase transformation from austenite to pearlite + ferrite/pearlite is further ensured to be completed before the strip steel is coiled.
4. The method for preventing the medium-high carbon steel hot-rolled steel coil from generating the flattening contusion defect as claimed in claim 1, wherein the steel coil is air-cooled to below 60 ℃.
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| ITMI20021996A1 (en) * | 2002-09-19 | 2004-03-20 | Giovanni Arvedi | PROCESS AND PRODUCTION LINE FOR THE MANUFACTURE OF ULTRA-THIN HOT TAPE BASED ON THE TECHNOLOGY OF THE THIN SHEET |
| CN1216700C (en) * | 2002-09-19 | 2005-08-31 | 鞍钢集团新钢铁有限责任公司 | Three section laminar flow cooling technology for hot rolling band steel |
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| CN102719755A (en) * | 2012-05-31 | 2012-10-10 | 攀钢集团攀枝花钢铁研究院有限公司 | High-strength high-processability hot-rolled pickled plate for automobile structures and production method thereof |
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