CN112044956B - Method for eliminating short-process production of 1.175mm high-strength steel coiled oval coil - Google Patents
Method for eliminating short-process production of 1.175mm high-strength steel coiled oval coil Download PDFInfo
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- CN112044956B CN112044956B CN202010893843.4A CN202010893843A CN112044956B CN 112044956 B CN112044956 B CN 112044956B CN 202010893843 A CN202010893843 A CN 202010893843A CN 112044956 B CN112044956 B CN 112044956B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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- 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
- B21B37/48—Tension control; Compression control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0057—Coiling the rolled product
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Abstract
The invention discloses a method for eliminating short-process production of an oval coil from a 1.175mm high-strength steel coil, which comprises the steps of controlling the unit tension of the steel strip, reducing the pressure of a pinch roll, adjusting the coil diameter tension, adjusting the tension distribution and clockwise rotating the steel coil after the steel coil is coiled after staying in the process of coiling the steel strip. The invention can eliminate the short-process production of the oval coil of the 1.175mm high-strength steel.
Description
Technical Field
The invention belongs to the technical field of hot-rolled plate strip manufacturing, and particularly relates to a method for eliminating short-process production of 1.175mm high-strength steel WJX750-NH coiled oval coils.
Background
The process flow of the high-strength steel developed by the continuous casting and rolling CSP of the Wu steel sheet billet comprises the following steps: desulfuration → converter → argon blowing → ladle furnace → vacuum furnace → continuous casting → soaking furnace → finish rolling → layer cold cooling → coiling → packing → leveling → weighing → external heating.
When the process flow is adopted to produce the 1.175mm high-strength steel WJX750-NH, the oval-shaped coiling phenomenon of the steel coil is easy to occur. The ellipse of the steel coil means that after the steel coil is drawn out from a winding drum of the coiling machine, the gravity of the steel coil is completely borne by the steel coil, the steel coil is in an ellipse shape under the action of the gravity, and the failure mode is called as ellipse coil.
The oval coil of strip need take certain measure can possess and go up the leveling unit, if the inner circle of artifical flame cut coil of strip enlarges the internal diameter, this can increase extra manpower, material resources, and can increase manufacturing cost, seriously influences the lumber recovery of production efficiency and variety. Meanwhile, the circumferential speed of the steel coil with large ovality is inconsistent in the flattening process, the tension fluctuation is severe, the surface of the steel coil is easily scratched, the use of a user is finally influenced, the product degradation or waste judgment is caused, and the larger economic loss is brought; even if the internal control of the steel coil with serious ellipse is manually expanded, finishing cannot be performed, and only waste treatment can be performed.
Therefore, a control method for eliminating the short-process production of 1.175mm high-strength steel WJX750-NH coiling oval coils is urgently needed.
Disclosure of Invention
The invention aims to provide a method for eliminating short-process production of 1.175mm high-strength steel rolled oval coils, which can eliminate short-process production of 1.175mm high-strength steel WJX750-NH rolled oval coils and improve the rolling quality and the product yield of 1.175mm high-strength steel WJX 750-NH.
The technical scheme adopted by the invention is as follows:
a method for eliminating the short-process production of an oval coil from a 1.175mm high-strength steel coil comprises the steps of controlling the unit tension of the steel strip, reducing the pressure of a pinch roll, adjusting the coil diameter tension, adjusting the tension distribution and clockwise rotation of the coiled steel coil after the steel strip is coiled.
Among the technological parameters of coiling production, unit tension is the most important parameter and directly influences the coiling quality of strip steel. The steel coil interlayer loose coil is easy to occur when the tension is too low, the strip steel is not wound tightly, and an oval coil appears after coil unloading; if the tension is too large, the strip steel is easy to deflect and scrape the side guide plate after coiling and tension building, so that the scrap steel is broken. In the invention, the unit tension of the strip steel is 54-56N/mm2。
The pinch roll is a dividing point of front and rear tension, and if the pressure of the pinch roll is too low, the pinch roll cannot play a role of tension division. As the upper pinch roll is a hollow roll, stress points are arranged on two sides of the pinch roll, the deflection amount of the pinch roll can be increased due to overlarge pinch roll pressure, and according to theoretical calculation, when the coiling stage of the strip steel is in a section III (coiling tension control stage), the roll gap in the middle of the roll body of the pinch roll is 0.9mm, the roll gaps on two sides of the pinch roll are only 0.3-0.4 mm, and the roll gaps on two sides of the pinch roll are too small, so that the edge part of the strip steel is thinned and broken, and the pressure of the pinch roll needs to be corrected appropriately. In the invention, the pressure of the pinch roll is-8 to-10 KN.
The tension of the steel coil is controlled by taper tension, namely, the tension is continuously reduced along with the increase of the diameter of the steel coil, and when the moderate coiling tension is selected, the steel coil biting tension and the number of turns of the steel coil kept by coiling with larger tension need to be increased for overcoming the oval coil caused by self gravity for increasing the rigidity of the steel coil. In the invention, the coil diameter tension is controlled according to the external diameter of the steel coil. The method specifically comprises the following steps: dividing a coiling stage into a section I, a section II, a section III and a section IV, wherein the section I is a steel biting tension, the section II is conversion from the steel biting tension to the coiling tension, the section III is coiling tension control, and the section IV is tension reducing control (constant moment); when the head of the strip steel enters a winding drum for 0-3 m, the steel biting tension of the section I is 120% of the coiling tension; rapidly switching from the section II to the section III, and controlling the diameter tension of the section III when the diameter of the steel coil is 1000-1400 mm; and when the diameter of the steel coil reaches 1400mm, performing tension control on the diameter of the IV-section coil until the coiling is finished.
Wherein, I section: the head of the strip steel enters a winding drum at 0< 3 m, and the winding diameter tension is as follows: 120% xT;
and II, section: 3 m < the head of the strip steel enters the winding drum and is less than or equal to 1400m, and the winding diameter tension is as follows: t;
and stage III: 1400< the head of the strip steel enters a winding drum to be not more than 1750 m, and the winding diameter tension is as follows: decrease from T to 0.8 XT;
and IV, section: 1750< the head of the strip steel enters the winding drum to be less than or equal to 2150 m, and the winding diameter tension is as follows: the coil diameter tension was reduced from 0.8 XT to 15KN until the end of coiling, wherein the coil diameter tension was reduced by a variation of 3N/mm2 XH.
In the rolling process, the thinner the steel strip, the higher the strength, the weaker the self-compensation capability for uneven deformation, the condition of edge wave and middle wave of the existing 1.175mm high-strength steel WJX750-NH occurs in the rolling process, and the combination with the high-strength steel needs larger coiling tension to tighten the steel strip to avoid staggered coiling, so that the larger tension distribution is needed to eliminate the adverse effect of the high-strength thin steel strip on the coiling quality. During coiling, the tension is divided into two parts, the sum of the two parts is 100%, the first part is the tension between the last stand of the mill and the pinch roll, and the second part is the tension between the pinch roll and the winding drum. The tension distribution refers to the percentage of the tension between the pinch roll and the winding drum in the total coiling tension, and is set according to the strength and the rolling thickness of the steel grade, and the principle is as follows: the thinner the strip, the greater the tension distribution and vice versa. In the invention, the tension between the pinch roll and the winding drum accounts for 65-70% of the total winding tension.
When the temperature of the strip steel is reduced to 650 ℃ from 880 ℃ through laminar cooling, the structure of the strip steel is transformed from austenite to ferrite plus pearlite, and the strip steel stays in a coiling machine after being coiled, so that the structure phase transformation can be promoted to be more sufficient; when the austenite is transformed into the ferrite, the compactness of the austenite is 74 percent and the compactness of the ferrite is 68 percent due to different atomic arrangements of the austenite and the ferrite, so that the volume of the steel strip is increased when the austenite is transformed into the ferrite, and the manual forward rotation ensures the stress release of the steel coil or the steel coil tightness. In the invention, after coiling, the steel coil waits for 2-4 minutes (preferably 3 minutes) in the coiling machine, the pinch roll, the auxiliary winding roll and the winding drum cooling water of the coiling machine are closed, and then the steel coil is manually rotated clockwise for 3-5 circles and then is unloaded.
In the invention, the unit tension of the strip steel is 54-56N/mm2. The tension of the strip steel coil is represented by T, and the unit is N/mm2T is the unit tension × H × W of the strip, wherein H, W represents the thickness and width of the strip, respectively, and the unit is mm.
The invention has the beneficial effects that:
when the pressure of the pinch roll is-8 to-10 KN, the roll gap in the middle of the pinch roll body is 1.0mm, and the roll gaps on the two sides of the pinch roll are only 0.5 to 0.6mm, so that the risk of strip edge part thinning and strip breakage caused by the undersize roll gaps on the two sides of the pinch roll is effectively relieved, and the problem that the deflection of the pinch roll is increased along with the larger tension distribution is solved.
The unit tension of the strip steel is 54-56N/mm2The steel coil can be prevented from being loosened between steel coil layers in the coiling process, the strip steel is not coiled tightly, and the strip steel deviates and scrapes the side guide plate after coiling and tensioning are built, so that the strip steel is broken on site.
The outer diameter of the steel coil is combined with the tension of the coil diameter, so that the oval coil caused by the self gravity of the steel coil can be overcome.
The tension between the pinch roll and the winding drum accounts for 65-70% of the total winding tension, so that the adverse effects (edge waves and middle waves) of the high-strength thin strip steel on the winding quality can be eliminated.
After coiling, the steel coil waits for 2-4 minutes in the coiling machine, so that the tissue phase change can be promoted to be more sufficient.
And the steel coil is manually rotated for 3-5 circles clockwise, so that the stress release of the steel coil or the tight coiling of the steel coil can be ensured.
The invention can be used by the existing equipment and control without modifying the equipment in the implementation process.
Can eliminate the ellipse coil defect in the production process of the steel grade with the thickness of 1.175 mm.
The method is simple and easy to implement, easy to operate and high in practicability.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
WJX750-NH produced in 2018, 12 months and 4 days, and the size specification is as follows: 1.175mm 1115 mm.
| Control process method | Unit of | Specific parameters |
| Strip steel unit tension | N/mm2 | 54 |
| Pressure of pinch roll | KN | -8 |
| Tension of coil diameter | / | The steel biting tension is 120 percent, and the outer diameter of the III steel coil is 1400mm |
| Tension distribution | ％ | 65 |
| Clockwise rotation of coiled steel coil after stay | Ring | Rotating for 3-5 circles after staying for 3 minutes |
The effects are as follows: and producing 20 coils of steel, wherein the total amount is 308.35 tons, and the coil shape non-ellipse rate is 100 percent.
Example two: WJX750-NH was produced in 12 months and 10 days 2018, 6 months and 7 days 2019 and 6 months and 12 days 2019, and the size specification: 1.175mm 1175 mm.
| Process control method | Unit of | Specific parameters |
| Strip steel unit tension | N/mm2 | 55 |
| Pressure of pinch roll | KN | -9 |
| Tension of coil diameter | / | The steel biting tension is 120 percent,III steel coil with outer diameter of 1400mm |
| Tension distribution | ％ | 68 |
| Clockwise rotation of coiled steel coil after retention | Ring | Rotating for 3-5 circles after staying for 3 minutes |
The effects are as follows: 30 coils of steel are produced, the total amount is 531.68 tons, and the coil shape non-ellipse percentage is 100 percent.
Example 3
30/3/2019 and 10/4/2019, and produces WJX750-NH, and the size specification is as follows: 1.175mm 1195 mm.
The effect is as follows: 24 coils of steel are produced, the total amount is 378.94 tons, and the coil shape non-ellipse percentage is 100 percent.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (4)
1. A method for eliminating short-process production of oval coils made of 1.175mm high-strength steel is characterized by comprising the following steps: the method comprises the steps of controlling the unit tension of the strip steel, reducing the pressure of a pinch roll, adjusting the tension of the coil diameter, adjusting the tension distribution and clockwise rotating the coiled steel coil after staying in the process of coiling the strip steel;
the coil diameter tension is controlled according to the external diameter of the steel coil;
dividing the coil diameter tension into a first section, a second section, a third section and a fourth section, wherein the first section is steel biting tension, the second section is conversion from the steel biting tension to coiling tension, the third section is coiling tension control, and the fourth section is tension reducing control;
when the head of the strip steel enters a winding reel for 0-3 m, the steel biting tension of the section I is 120% of the winding tension, and when the head of the strip steel enters the winding reel for 1400mm, the winding diameter tension of the section IV is controlled until the winding is finished;
i section: the head of the strip steel enters a winding drum at 0< 3 m, and the winding diameter tension is as follows: 120% xT;
and II, section: 3 m < the head of the strip steel enters the winding drum and is less than or equal to 1400m, and the winding diameter tension is as follows: t;
stage III: 1400< the head of the strip steel enters a winding drum to be less than or equal to 1750 m, and the winding diameter tension is as follows: decrease from T to 0.8 XT;
and IV, section: 1750< the head of the strip steel enters the winding drum to be less than or equal to 2150 m, and the winding diameter tension is as follows: the coil diameter tension is reduced from 0.8 XT to 15KN until the coiling is finished, and the coil diameter tension is reduced by the variation of 3N/mm2 XH;
after coiling, the steel coil waits for 2-4 minutes in a coiling machine, and then the steel coil is manually rotated clockwise for 3-5 circles.
2. The method for eliminating short-run production of 1.175mm high-strength steel rolled into oval coil according to claim 1, wherein the method comprises the following steps: the unit tension of the strip steel is 54-56N/mm2。
3. The method for eliminating short-run production of 1.175mm high-strength steel rolled into oval coil according to claim 1, wherein the method comprises the following steps: the pressure of the pinch roll is-8 to-10 KN.
4. The method for eliminating short-run production of 1.175mm high-strength steel rolled into oval coil according to claim 1, wherein the method comprises the following steps: the tension between the pinch roll and the winding drum accounts for 65-70% of the total winding tension.
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| CN202010893843.4A CN112044956B (en) | 2020-08-31 | 2020-08-31 | Method for eliminating short-process production of 1.175mm high-strength steel coiled oval coil |
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| CN112044956B true CN112044956B (en) | 2022-07-15 |
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| US4576029A (en) * | 1984-07-24 | 1986-03-18 | Kawasaki Steel Corporation | Method of coiling thin strips |
| CN102335681A (en) * | 2010-07-21 | 2012-02-01 | 宝山钢铁股份有限公司 | Coiling method for preventing hot rolling strip steel from being flatly coiled |
| CN102581067A (en) * | 2011-01-06 | 2012-07-18 | 宝山钢铁股份有限公司 | Hot-rolled coiler pinch roll controlling method |
| CN104971952A (en) * | 2015-05-25 | 2015-10-14 | 武汉钢铁(集团)公司 | Control method for eliminating flat coiling of hot-rolled thin-gauge checkered plate |
| CN109266960A (en) * | 2018-09-26 | 2019-01-25 | 武汉钢铁有限公司 | Using the tensile strength >=800MPa thin gauge weathering steel and method of short route production |
| CN110355213A (en) * | 2019-06-25 | 2019-10-22 | 武汉钢铁有限公司 | Short route production medium carbon steel 50Mn2V's batches staggered floor control method |
| CN111408625A (en) * | 2020-03-16 | 2020-07-14 | 武汉钢铁有限公司 | Flat coil control method for hot rolling advanced high-strength steel |
| CN111570517A (en) * | 2020-04-15 | 2020-08-25 | 武汉钢铁有限公司 | Coiling control method for producing hot formed steel by thin slab continuous casting and rolling |
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2020
- 2020-08-31 CN CN202010893843.4A patent/CN112044956B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4576029A (en) * | 1984-07-24 | 1986-03-18 | Kawasaki Steel Corporation | Method of coiling thin strips |
| CN102335681A (en) * | 2010-07-21 | 2012-02-01 | 宝山钢铁股份有限公司 | Coiling method for preventing hot rolling strip steel from being flatly coiled |
| CN102581067A (en) * | 2011-01-06 | 2012-07-18 | 宝山钢铁股份有限公司 | Hot-rolled coiler pinch roll controlling method |
| CN104971952A (en) * | 2015-05-25 | 2015-10-14 | 武汉钢铁(集团)公司 | Control method for eliminating flat coiling of hot-rolled thin-gauge checkered plate |
| CN109266960A (en) * | 2018-09-26 | 2019-01-25 | 武汉钢铁有限公司 | Using the tensile strength >=800MPa thin gauge weathering steel and method of short route production |
| CN110355213A (en) * | 2019-06-25 | 2019-10-22 | 武汉钢铁有限公司 | Short route production medium carbon steel 50Mn2V's batches staggered floor control method |
| CN111408625A (en) * | 2020-03-16 | 2020-07-14 | 武汉钢铁有限公司 | Flat coil control method for hot rolling advanced high-strength steel |
| CN111570517A (en) * | 2020-04-15 | 2020-08-25 | 武汉钢铁有限公司 | Coiling control method for producing hot formed steel by thin slab continuous casting and rolling |
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