CN107855368A - Cooling means after steel rolling - Google Patents
Cooling means after steel rolling Download PDFInfo
- Publication number
- CN107855368A CN107855368A CN201710999591.1A CN201710999591A CN107855368A CN 107855368 A CN107855368 A CN 107855368A CN 201710999591 A CN201710999591 A CN 201710999591A CN 107855368 A CN107855368 A CN 107855368A
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- CN
- China
- Prior art keywords
- cooling
- steel
- temperature
- cooled
- tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000001816 cooling Methods 0.000 title claims abstract description 87
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 66
- 239000010959 steel Substances 0.000 title claims abstract description 66
- 238000005096 rolling process Methods 0.000 title claims abstract description 24
- 239000007921 spray Substances 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 230000007704 transition Effects 0.000 abstract description 2
- 238000003801 milling Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000009749 continuous casting Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses the cooling means after a kind of steel rolling, wherein, the cooling means includes：1) the Guan Gangjing jets after finish to gauge are cooled to surface temperature as 800 850 DEG C；2) it is 880 920 DEG C that the pipe steel after above-mentioned jet is cooled down, which stands and risen again to surface temperature,；3) Guan Gang after above-mentioned standing is risen again be cooled to temperature for after 800 850 DEG C, be placed in it is air-cooled under the conditions of be cooled to temperature as 400 500 DEG C；Wherein, the cooldown rate in step 1) is 2.2 2.8 DEG C/s.The present invention cools down the Guan Gangxian after finish to gauge through jet, risen again again by its surface temperature of transition temperature inside Guan Gang, carry out again air-cooled, reach on the premise of milling train production is not influenceed, by cooling control after rolling technical measures improve SA 210C high-pressure boiler pipes banded structure, and and then improve made from SA 210C high-pressure boiler pipes quality.
Description
Technical Field
The invention relates to the field of steel rolling production processes, in particular to a cooling method after steel rolling.
Background
The reason for generating the banded structure is generally considered to be mainly caused by component segregation in the steel-making continuous casting process, and the banded structure is improved by controlling the continuous casting drawing speed and the superheat degree and adjusting electric stirring in the prior art. While the carbon content in the SA-210C steel is 0.17-0.23%, the above-mentioned conventional steel-making process adjustment measures have little effect on improving the strip structure of the steel. The strip structure can be improved by controlling the initial rolling temperature and the final rolling temperature in the steel rolling process, but the process inevitably influences the production rhythm of the rolling mill, further influences the yield of the rolling mill, and simultaneously increases the production load of the rolling mill and causes the hidden trouble of equipment failure.
Therefore, the present invention provides a cooling method after rolling, which can effectively improve the strip structure of a steel member using SA-210C steel as a raw material and improve the quality grade of the product without affecting the production of a rolling mill.
Disclosure of Invention
Aiming at the prior art, the invention aims to solve the problems that the effect of the method for improving the strip structure by controlling the continuous casting drawing speed and the superheat degree and adjusting the electric stirring is not great on the SA-210C steel, the quality of a rolling mill is inevitably influenced by the method for improving the strip structure by controlling the starting temperature and the final temperature in the steel rolling process, and the like, thereby providing the post-rolling cooling method which can effectively improve the strip structure of a steel piece taking the SA-210C steel as a raw material and improve the quality grade of a product on the premise of not influencing the production of the rolling mill.
In order to achieve the above object, the present invention provides a cooling method after rolling steel, wherein the cooling method comprises:
1) cooling the finally rolled tube steel to the surface temperature of 800-850 ℃ by jet flow;
2) standing the pipe steel after the jet flow cooling and returning the temperature to the surface temperature of 880-920 ℃;
3) cooling the pipe steel after standing and temperature returning to the temperature of 800-850 ℃, and then cooling the pipe steel to the temperature of 400-500 ℃ under the air cooling condition; wherein,
the cooling rate in step 1) is 2.2-2.8 ℃/s.
Preferably, the air cooling in the step 3) at least comprises a first cooling section and a second cooling section, wherein the first cooling section is cooled from 800-; wherein,
the cooling rate of the first cooling section is 2.2-2.8 ℃/s;
the cooling rate of the second cooling section is 1.5-2.1 ℃/s.
Preferably, the jet cooling in the step 1) is to cool the tube steel through a plurality of spray rings, the spray rings are uniformly distributed along the length direction of the tube steel, the surfaces of the spray rings are octagonal, the side length of each spray ring is 10-30cm, and a nozzle is arranged at the center of each side of each spray ring.
Preferably, the distance between two adjacent spray rings is 10-30 cm.
Preferably, the flow rate of the water flow sprayed out of each nozzle is 150-200 mL/s.
Preferably, the step 3) is carried out by placing on a cooling bed for air cooling.
Preferably, when the diameter of the pipe steel is not less than 100mm, a gap is formed between two adjacent pipe steels; when the diameter of the pipe steel is less than 100mm, two adjacent pipe steels can be placed in contact.
Preferably, the distance of the gap between the two tube steels forming the gap is 4/5-6/5 of the tube steel diameter.
Through the technical scheme, the finally rolled tube steel is firstly cooled to the surface temperature of 800-plus-850 ℃ through jet flow at a certain cooling rate, then the surface temperature of the tube steel is heated to 880-plus-920 ℃ through the conduction temperature in the tube steel, then the tube steel after being heated is further cooled to the temperature of 800-plus-850 ℃ and then is cooled to 400-plus-500 ℃ under the air cooling condition, and further the strip structure of the tube blank of the SA-210C high-pressure boiler is improved through the post-rolling cooling control technical measure on the premise of not influencing the production of a rolling mill through the cooling mode, and the quality of the prepared tube blank of the SA-210C high-pressure boiler is further improved.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides a cooling method after steel rolling, wherein the cooling method comprises the following steps:
1) cooling the finally rolled tube steel to the surface temperature of 800-850 ℃ by jet flow;
2) standing the pipe steel after the jet flow cooling and returning the temperature to the surface temperature of 880-920 ℃;
3) cooling the pipe steel after standing and temperature returning to the temperature of 800-850 ℃, and then cooling the pipe steel to the temperature of 400-500 ℃ under the air cooling condition; wherein,
the cooling rate in step 1) is 2.2-2.8 ℃/s.
The invention firstly cools the finally rolled tube steel to the surface temperature of 800-.
In a preferred embodiment of the present invention, in order to further improve the quality of the obtained product and improve the ribbon structure, the air cooling in step 3) may be configured to include at least a first cooling section and a second cooling section, wherein the first cooling section is cooled from 800-.
Further, the cooling rates of the two cooling sections can be further limited to better achieve the effect of improving the product quality, wherein the cooling rate of the first cooling section can be further limited to be 2.2-2.8 ℃/s; the cooling rate of the second cooling stage may be further defined as 1.5-2.1 deg.c/s.
Of course, the jet cooling is only required to be carried out by spraying cooling liquid, and in a more preferred embodiment of the present invention, for example, in order to achieve better cooling effect and further improve the structure of the strip-shaped structure, the jet cooling in step 1) may be further selected to be carried out by cooling the tube steel by a plurality of spray rings, and the plurality of spray rings are uniformly distributed along the length direction of the tube steel. The spray ring can be further selected to be arranged in an octagonal cylinder structure, or at least the surface of the spray ring is formed in an octagon shape, and the surface of the spray ring becomes further selected to be 10-30cm, further, the center position of each side of the spray ring is respectively provided with a nozzle, namely, each spray ring is provided with 8 nozzles, which will not be described in detail herein. Of course, the number of spray rings can be selected according to actual needs, for example, in a preferred embodiment, the spray rings can be arranged in 3-8 groups, further, 5 groups can be selected, and of course, other numbers can be used here.
Further, in a preferred embodiment of the present invention, the distance between two adjacent spray rings may be selected to be 10-30 cm. Of course, the distance mentioned here may be the shortest distance between two spray rings, that is, the distance between the end points of two adjacent spray rings, or the distance between the centers of the spray rings (that is, the center of the octagon), which will not be described herein.
In a preferred embodiment of the invention, the flow rate of the water stream sprayed out of each nozzle is 150-.
The air cooling in step 3) may be selected in a conventional manner, for example, in a preferred embodiment of the present invention, step 3) may be air cooled on a cooling bed.
Of course, the placing mode of the tube steel in the air cooling process can be selected according to actual needs, for example, a plurality of tube steels can be placed side by side along the conveying direction. Further, when the diameter of the pipe steel is not less than 100mm, a gap is formed between every two adjacent pipe steels; when the diameter of the pipe steel is less than 100mm, two adjacent pipe steels can be placed in contact. The gap can be understood as a certain gap between two pieces of tube steel when the two pieces of tube steel are placed, and the two pieces of tube steel are placed in contact with each other, that is, the two pieces of tube steel can be attached to each other by the side walls, which is not described in detail herein.
In a more preferred embodiment of the invention, the distance of the gap between the two tube steels forming the gap may further be selected to be 4/5-6/5 of the tube steel diameter.
In summary, firstly, the cooling process adopts a first-speed and second-speed cooling rate, so that the carbon element is uniformly precipitated when the cooling process is started in a phase transition temperature range. After conventional steel rolling, the product obtained by the cooling mode of the invention is supplemented, the structure state is better, the zonal structure level is low, the structure can be reduced from the conventional level 3 to the level below 2, and abnormal structures such as widmanstatten, bainite and the like do not exist, so the product quality is greatly improved.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (8)
1. A cooling method after steel rolling is characterized by comprising the following steps:
1) cooling the finally rolled tube steel to the surface temperature of 800-850 ℃ by jet flow;
2) standing the pipe steel after the jet flow cooling and returning the temperature to the surface temperature of 880-920 ℃;
3) cooling the pipe steel after standing and temperature returning to the temperature of 800-850 ℃, and then cooling the pipe steel to the temperature of 400-500 ℃ under the air cooling condition; wherein,
the cooling rate in step 1) is 2.2-2.8 ℃/s.
2. The cooling method as claimed in claim 1, wherein the air cooling in step 3) comprises at least a first cooling section and a second cooling section, and the first cooling section is cooled from 850 ℃ to 720-780 ℃, and the second cooling section is cooled from 720-780 ℃ to 400-500 ℃; wherein,
the cooling rate of the first cooling section is 2.2-2.8 ℃/s;
the cooling rate of the second cooling section is 1.5-2.1 ℃/s.
3. The cooling method according to claim 1 or 2, wherein the jet cooling in the step 1) is cooling the tube steel by a plurality of spray rings, and the spray rings are uniformly distributed along the length direction of the tube steel;
the surface of the spray ring is formed into an octagon, the side length is 10-30cm, and the center of each side of the spray ring is provided with a nozzle.
4. A cooling method according to claim 3, wherein the distance between two adjacent spray rings is 10-30 cm.
5. The cooling method as claimed in claim 3, wherein the flow rate of the water sprayed from each nozzle is 150-200 mL/s.
6. The cooling method according to claim 1 or 2, wherein the step 3) is performed by air cooling on a cooling bed.
7. The cooling method according to claim 6, wherein when the diameter of the tube steel is not less than 100mm, a gap is formed between two adjacent tube steels; when the diameter of the pipe steel is less than 100mm, two adjacent pipe steels can be placed in contact.
8. The cooling method according to claim 7, wherein the distance of the gap between the two tube steels forming the gap is 4/5-6/5 of the diameter of the tube steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710999591.1A CN107855368B (en) | 2017-10-24 | 2017-10-24 | Cooling method after steel rolling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710999591.1A CN107855368B (en) | 2017-10-24 | 2017-10-24 | Cooling method after steel rolling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107855368A true CN107855368A (en) | 2018-03-30 |
| CN107855368B CN107855368B (en) | 2020-04-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710999591.1A Active CN107855368B (en) | 2017-10-24 | 2017-10-24 | Cooling method after steel rolling |
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| Country | Link |
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| CN (1) | CN107855368B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108971244A (en) * | 2018-09-25 | 2018-12-11 | 芜湖新兴铸管有限责任公司 | Rolled steel cooling means |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1184718A (en) * | 1996-12-10 | 1998-06-17 | 鞍山钢铁集团公司 | Process for producing steel wire being used to produce tyre steel cord |
| CN102259112A (en) * | 2011-04-12 | 2011-11-30 | 首钢总公司 | Method for controlling structural homogeneity of high-carbon steel coil rod for deep drawing of steel wire |
| CN102671938A (en) * | 2012-05-08 | 2012-09-19 | 首钢总公司 | High speed production method for controlling banded structure of low carbon steel wire rod |
| CN103194580A (en) * | 2013-04-03 | 2013-07-10 | 武汉钢铁(集团)公司 | Rolling method of low-banded structure gear steel |
| CN104001741A (en) * | 2014-04-29 | 2014-08-27 | 张家港联峰钢铁研究所有限公司 | Post-rolling cooling control method for small-size high-Cr 82B wire rods |
-
2017
- 2017-10-24 CN CN201710999591.1A patent/CN107855368B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1184718A (en) * | 1996-12-10 | 1998-06-17 | 鞍山钢铁集团公司 | Process for producing steel wire being used to produce tyre steel cord |
| CN102259112A (en) * | 2011-04-12 | 2011-11-30 | 首钢总公司 | Method for controlling structural homogeneity of high-carbon steel coil rod for deep drawing of steel wire |
| CN102671938A (en) * | 2012-05-08 | 2012-09-19 | 首钢总公司 | High speed production method for controlling banded structure of low carbon steel wire rod |
| CN103194580A (en) * | 2013-04-03 | 2013-07-10 | 武汉钢铁(集团)公司 | Rolling method of low-banded structure gear steel |
| CN104001741A (en) * | 2014-04-29 | 2014-08-27 | 张家港联峰钢铁研究所有限公司 | Post-rolling cooling control method for small-size high-Cr 82B wire rods |
Non-Patent Citations (1)
| Title |
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Cited By (1)
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| CN108971244A (en) * | 2018-09-25 | 2018-12-11 | 芜湖新兴铸管有限责任公司 | Rolled steel cooling means |
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| Publication number | Publication date |
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| CN107855368B (en) | 2020-04-14 |
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