CN113695391B - Production method for steel width exceeding limit for hot rolling container - Google Patents
Production method for steel width exceeding limit for hot rolling container Download PDFInfo
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- CN113695391B CN113695391B CN202111083168.XA CN202111083168A CN113695391B CN 113695391 B CN113695391 B CN 113695391B CN 202111083168 A CN202111083168 A CN 202111083168A CN 113695391 B CN113695391 B CN 113695391B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 50
- 239000010959 steel Substances 0.000 title claims abstract description 50
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000005098 hot rolling Methods 0.000 title claims abstract description 9
- 238000005096 rolling process Methods 0.000 claims abstract description 95
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 238000013461 design Methods 0.000 claims description 14
- 230000009467 reduction Effects 0.000 claims description 13
- 238000005516 engineering process Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 238000003723 Smelting Methods 0.000 claims description 3
- 238000013499 data model Methods 0.000 abstract description 5
- 238000005452 bending Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000013072 incoming material Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
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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
-
- 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
-
- 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
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
A production method for the steel for a hot rolling container with the width exceeding the limit comprises the following steps: controlling the positive pressure steel burning of a heating area to be 5-10 Pa, and controlling the temperature difference between the upper surface and the lower surface of the plate blank to be 30-50 ℃; the rolling side of the guide ruler allowance in the rough rolling area is controlled to be 50-100 mm, and the non-rolling side is controlled to be 100-200 mm; the short stroke rolling side of the guide ruler is 10-50 mm, and the non-rolling side is set to be 50-100 mm; the allowance of a frame guide ruler in a finish rolling area is controlled to be 40-100 mm, and the short stroke amount is 20-50 mm; the allowance of the coiling area guide ruler is controlled to be 50-120 mm, and the sum of the two short strokes is 20-100 mm. According to the invention, under the condition of not changing the existing equipment, a secondary data model is redesigned, and a production method for the steel for the hot-rolled 1580-line container with the width exceeding the limit is developed, so that the steel for the container with the width of 1465mm is produced.
Description
Technical Field
The invention relates to the field of steel rolling processes, in particular to a production method for the steel width overrun for a hot rolling container.
Background
In recent years, the production cost of the steel industry is high, and enterprises are in management transformation and continuously innovate. According to market requirements, a hot rolling department of a certain steel mill finds that the steel for the container has special dosage requirements in the 1460 width specification through field investigation and visiting communication, and due to reasons such as unit design, waiting period and the like, the ordering freedom of downstream users is limited.
A1580 hot rolling production line of a certain steel mill is built and put into production in 2008, only strip steel with the maximum width of 1430mm can be produced after the production is put into production according to design specifications, in order to meet the requirement of a customer on full width coverage of a steel order for a container, the freedom degree of ordering of downstream users is improved, meanwhile, the product specification limit is challenged to cultivate the profit point of high-specification and high-quality products, the competitiveness of an enterprise in the market is improved, and the development of a production method for the steel width of a hot rolling 1580 line container exceeding the limit is urgently needed under the condition that the existing equipment state is not changed.
Disclosure of Invention
The invention aims to provide a production method for the steel for a hot-rolled container with the width exceeding the limit, which is developed under the condition of not changing the existing equipment, redesigns a secondary data model and meets the production requirement.
In order to achieve the purpose, the invention adopts the following technical scheme:
a production method for the steel for a hot rolling container with the width exceeding the limit comprises the following steps:
1) Heating area: controlling the positive pressure steel-smelting to be 5-10 Pa, and controlling the temperature difference between the upper surface and the lower surface of the plate blank to be 30-50 ℃;
2) A rough rolling area: the rolling side of the guide ruler allowance is controlled to be 50-100 mm, and the non-rolling side is controlled to be 100-200 mm; the short stroke rolling side of the guide ruler is 10-50 mm, and the non-rolling side is set to be 50-100 mm;
the thickness of the rough rolling outlet plate blank is 38-42 mm;
the rolling reduction of the first two passes of the rough rolling horizontal roller is not lower than 0.9 time of the maximum design value, the rolling reduction of the middle pass is 0.70-0.80 time of the maximum design value, and the rolling reduction of the last pass is 0.5-0.6 time of the maximum design value;
3) A finish rolling area: adopting the small guide rule allowance of the front frame, wherein the guide rule allowance is gradually increased along with the increase of a rolling mill, the guide rule allowance of the frame is controlled to be 40-100 mm, and the short stroke amount is 20-50 mm;
4) Coiling area: adopting the technology of small opening degree allowance of a front guide ruler of a first coiling machine and one-time short stroke in place; the opening allowance of the front guide ruler of the last coiling machines is gradually increased, the short stroke amount of two times is quickly in place, the allowance of the guide ruler is controlled to be 50-120 mm, and the sum of the short stroke amount of two times is 20-100 mm.
The central line of the strip steel in the rough rolling area is controlled within +/-20 mm.
The roll diameter of the finish rolling F1-F3 rolls is 710-750 mm.
The central line of the strip steel in the finish rolling area is controlled within +/-20 mm.
The wedge shape of the plate blank rolled by the rolling mill in the rough rolling area R1 is less than 0.5mm.
The super limit value of the width of the steel plate produced by the method is within 2.5 percent of the maximum width value designed by a production line.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, under the condition of not changing the existing equipment, a secondary data model is redesigned, a production method that the width of the steel for the hot-rolled 1580-line container exceeds the limit is developed, the steel for the container with the width of 1465mm is produced, the freedom degree of ordering of downstream users is improved, the market share is further improved, and the market competitiveness of enterprises is improved.
Detailed Description
In order to achieve the above objects, features and advantages and to make the invention more comprehensible, the present invention is described in further detail with reference to specific embodiments.
The maximum width of the raw material plate blank of the saddle steel 1580 production line is 1450mm, and the maximum width of a designed and produced product is 1430mm. Because the production method that the width of the steel for the container exceeds the limit is researched and developed under the condition of not changing the existing equipment state, the rolling plan needs to be optimized, the problems of technological bottleneck, equipment precision improvement, digital-analog design and the like are solved; in addition, the maximum width of the raw material specification is 1450mm, if a product with the width of over 1450mm is to be produced, the product belongs to negative width rolling, and a secondary data model needs to be redesigned to meet the requirement.
A production method for the steel for the hot-rolled 1580-line container with the width exceeding the limit comprises the following steps:
1) In order to meet the requirement of the profile of a finished product of the cross section of the strip steel, the 15 th steel is arranged to be rolled in the period, and the width of the finished product is gradually increased by 50-100 mm to be gradually transited to the maximum width 1465mm according to stages; in order to prevent the electric jump steel jamming caused by excessive load of finish rolling, the working roll of the rolling mill of the front stand is used with the smallest roll diameter as possible, and the roll diameters of finish rolling F1-F3 are 710-750 mm.
2) In order to prevent equipment accidents such as clamping of a guide ruler, a bearing box and the like caused by large lateral bending of strip steel, a high-precision lateral bending control technology of the strip steel is adopted to solve the technical bottleneck of the container steel width ultra-limit production, and the main content is as follows:
heating area: controlling the positive pressure steel-smelting to be 5-10 Pa, and preventing the longitudinal shade and sun surfaces of the plate blank; the temperature difference between the upper surface and the lower surface of the plate blank is controlled to be 30-50 ℃, and the phenomenon of head buckling is avoided;
a rough rolling area: the rolling side of the allowance of the guide ruler is controlled to be 50-100 mm, and the non-rolling side is controlled to be 100-200 mm; the short stroke rolling side of the guide ruler is 10-50 mm, and the non-rolling side is set to be 50-100 mm;
the thickness of the rough rolling outlet plate blank is 38-42 mm;
the rolling reduction of the two passes before rough rolling is not less than 0.9 time of the maximum design value of the rolling reduction of the roller, the rolling reduction of the middle pass is 0.70-0.80 time of the maximum design value of the rolling reduction of the roller, and the rolling reduction of the last pass is 0.5-0.6 time of the maximum design value of the rolling reduction of the roller;
the rough rolling area is in reciprocating rolling, the rolling side guide ruler adopts small allowance control to ensure that the material type before rolling is controlled according to the central line, the non-rolling side guide ruler is additionally provided with short stroke control, when the head of the strip steel enters the head of the guide ruler, the guide ruler executes the short stroke control, the allowance of the rear guide ruler executes the small allowance control of the guide ruler set by the rolling side, and the large difference between the material type after rolling and the central line is prevented. The operation is to pre-adjust the R1 rolling mill for the material shape of the plate blank after the plate blank exits from the width fixing machine, the adjustment amount is determined by the size of the lateral bend, and the wedge shape of the plate blank rolled by the R1 rolling mill in the rough rolling area is ensured to be less than 0.5mm. The R2 rolling mill performs small-amount pre-adjustment according to the side bending of the plate blank rolled by the R1 rolling mill, and the central line of the strip steel rolled by rough rolling is ensured to be in accordance with the central line; the central line of the strip steel in the rough rolling area is controlled within +/-20 mm, so that the side bending large steel clamping accident is prevented.
A finish rolling area: adopting the small guide bar allowance of the front frame, wherein the guide bar allowance is gradually increased along with the increase of a rolling mill, the guide bar allowance of the frame is 40-100 mm, and the short stroke amount is 20-50 mm; the operation is pre-adjusted according to the material type of the rough rolling incoming material, the material type of the strip steel is adjusted to be straight by utilizing a method of gradually adjusting three rolling mills before finish rolling, and the product profile of the cross section of the strip steel is ensured to meet the requirements by micro-adjusting four rolling mills after finish rolling.
The central line of the strip steel in the finish rolling area is controlled within +/-20 mm, and the side bending and large steel clamping accidents are prevented.
In the finish rolling area, the technology that the allowance of each frame guide ruler is reduced firstly and then increased is adopted, strip steel is guaranteed to pass through and roll along the rolling center line, and the rolling stability is improved.
Coiling area: adopting the technology of small opening degree allowance of a front guide ruler of a first coiling machine and one-time short stroke in place; the opening allowance of the front guide ruler of the back coiling machines is gradually increased, and the short stroke amount of the last coiling machine is quickly in place. The allowance of the guide ruler is 50-120 mm, the sum of the two short strokes is 20-100 mm, and the smooth entering of the strip steel into a coiling machine and the coiling quality are ensured.
Winding area: in order to ensure that the strip steel normally enters a coiling machine and the coiling quality of the strip steel, a technology of small opening allowance and large and short stroke amount of a coiling front guide ruler is adopted.
According to the invention, the measuring precision of the vertical roll is improved by the special measuring tool for the vertical roll; the original precision of the equipment is improved by testing, measuring and checking the limit value of the guide ruler in each area for multiple times at multiple points, and the equipment limit of the container steel width ultra-limit production is met. The guide ruler precision is controlled within +/-3 mm, the vertical roll precision is controlled within +/-2 mm, and the original precision of the equipment is improved.
The maximum width of the raw material plate blank of the 1580 line is 1450mm, and the maximum width of the finished product strip steel can be 1465mm through theoretical calculation. Because the rough rolling area plays a decisive role in the width of the finished strip steel and the finish rolling load of ultra-wide strip steel is large, a rough rolling secondary data model for negative width rolling is developed by adopting a control technology of reducing the thickness of a rough rolling outlet plate blank, reducing the number of passes of a rough rolling flat roll, reducing the pressure, trimming a front stand of a vertical roll and maintaining the width of a rear stand. Namely, the thickness of the rough rolling outlet plate blank is 38-42 mm, and the rolling load of finish rolling is reduced; the rolling passes are reduced on the principle that the two rolling reductions in the front of a rough rolling flat roll reach more than 0.9 time of the designed maximum value, the middle pass is 0.70-0.80 time of the designed maximum value, and the last pass is 0.5-0.6 time of the designed maximum value, the roll gap is set by a front stand of a vertical roll according to the width after the thermal scale is expanded by theoretical calculation, the roll gap is set by a rear stand according to the thermal scale width of the finished product width, and after the control technology is adopted, the model design of the negative width rolling technology is solved through field practice.
Claims (6)
1. A production method for the steel for the hot rolling container with the width exceeding the limit is characterized by comprising the following steps:
1) Heating area: controlling the positive pressure steel-smelting to be 5-10 Pa, and controlling the temperature difference between the upper surface and the lower surface of the plate blank to be 30-50 ℃;
2) A rough rolling area: the rolling side of the guide ruler allowance is controlled to be 50-100 mm, and the non-rolling side is controlled to be 100-200 mm; the short stroke rolling side of the guide ruler is 10-50 mm, and the non-rolling side is set to be 50-100 mm;
the thickness of the rough rolling outlet plate blank is 38-42 mm;
the rolling reduction of the first two passes of the rough rolling horizontal roller is not lower than 0.9 time of the maximum design value, the rolling reduction of the middle pass is 0.70-0.80 time of the maximum design value, and the rolling reduction of the last pass is 0.5-0.6 time of the maximum design value;
3) A finish rolling area: the margin of a guide ruler of the frame is controlled to be 40-100 mm, the short stroke amount is 20-50 mm, the margin of a small guide ruler of a front frame is adopted, and the margin of the guide ruler is gradually increased along with the increase of the rolling mill;
4) Coiling area: the technology that the small opening degree allowance of the front guide ruler of the first coiler is in place by one-time short stroke is adopted, the technology that the opening degree allowance of the front guide ruler of the last coiler is gradually increased and the short strokes of the last coiler are in place quickly by two times is adopted, the allowance of the guide ruler is controlled to be 50-120 mm, and the sum of the short strokes of the last coiler is 20-100 mm.
2. The method of claim 1, wherein the control of the center line of the strip in the roughing zone is within ± 20 mm.
3. The method of claim 1, wherein the roll diameter of the finish rolling F1 to F3 rolls is 710 to 750mm.
4. The method of claim 1, wherein the centerline of the steel strip in the finish rolling area is controlled within ± 20 mm.
5. The method of claim 1, wherein the slab wedge shape of the rough rolling zone R1 rolling mill is less than 0.5mm.
6. The method as claimed in claim 1, wherein the super-limit value of the width of the steel sheet for the hot rolled container is within 2.5% of the maximum width value of the design line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111083168.XA CN113695391B (en) | 2021-09-15 | 2021-09-15 | Production method for steel width exceeding limit for hot rolling container |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111083168.XA CN113695391B (en) | 2021-09-15 | 2021-09-15 | Production method for steel width exceeding limit for hot rolling container |
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| Publication Number | Publication Date |
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| CN113695391A CN113695391A (en) | 2021-11-26 |
| CN113695391B true CN113695391B (en) | 2023-01-17 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05104121A (en) * | 1991-10-15 | 1993-04-27 | Kawasaki Steel Corp | Hot rolling method |
| CN204276517U (en) * | 2014-11-17 | 2015-04-22 | 一重集团大连设计研究院有限公司 | A kind of production line that can replace conventional broadband steel hot continuous rolling |
| CN106734234A (en) * | 2016-12-13 | 2017-05-31 | 山东钢铁股份有限公司 | A kind of control method of the preceding jig surplus of hot-strip finishing mill |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2445659B1 (en) * | 2009-06-23 | 2014-04-09 | SMS Siemag AG | Method and device for processing a slab |
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2021
- 2021-09-15 CN CN202111083168.XA patent/CN113695391B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05104121A (en) * | 1991-10-15 | 1993-04-27 | Kawasaki Steel Corp | Hot rolling method |
| CN204276517U (en) * | 2014-11-17 | 2015-04-22 | 一重集团大连设计研究院有限公司 | A kind of production line that can replace conventional broadband steel hot continuous rolling |
| CN106734234A (en) * | 2016-12-13 | 2017-05-31 | 山东钢铁股份有限公司 | A kind of control method of the preceding jig surplus of hot-strip finishing mill |
Non-Patent Citations (1)
| Title |
|---|
| 粗轧机导尺短行程在热连轧板带生产中的应用;李文等;《中国冶金》;20111031(第10期);第28-30页、34页 * |
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| CN113695391A (en) | 2021-11-26 |
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