CN108941213A - Control the milling method of high tensile hot rolled steel sheet structural homogenity - Google Patents
Control the milling method of high tensile hot rolled steel sheet structural homogenity Download PDFInfo
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- CN108941213A CN108941213A CN201810661642.4A CN201810661642A CN108941213A CN 108941213 A CN108941213 A CN 108941213A CN 201810661642 A CN201810661642 A CN 201810661642A CN 108941213 A CN108941213 A CN 108941213A
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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
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
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Abstract
The invention discloses a kind of milling methods, especially disclose a kind of milling method for controlling high tensile hot rolled steel sheet structural homogenity, belong to steel plate rolling technique technical field.A kind of milling method that high tensile hot rolled steel sheet structural homogenity can be effectively controlled by improving to rolling process and its parameter is provided.The milling method includes that samming heated for controlling temperature difference is come out of the stove, the reversible roughing mill middling speed roughing of four-roller, the several steps of cooling under the conditions of seven frame tandem mill surface temperature-controlled finish rolling and section cooling unit control internal and external temperature, wherein, in the reversible roughing mill middling speed rough rolling process of four-roller, it opens four roll reversing roller inlet high pressure water descaling jets and de-scaling and cooling is carried out to belt steel surface, reduce belt steel surface temperature by 80~120 DEG C.
Description
Technical field
The present invention relates to a kind of milling methods, more particularly, to a kind of rolling for control high tensile hot rolled steel sheet structural homogenity
Method processed belongs to steel plate rolling technique technical field.
Background technique
Hot rolled steel plate is the important raw material for being widely used in the development of the national economy, generallys use hot tandem to hot rolling
Strip or single chassis/double-stand reversible mill carry out Rolling Production to medium plate.As downstream user is to product quality requirement
Raising, the requirement to the hot rolled steel plate quality as raw material is also higher and higher therewith, advises especially for thickness >=10mm
The requirement of the steel plate through-thickness structural homogenity of lattice is also higher and higher.It is well known that working as thick specification hot-rolled interior thickness
When direction structural homogenity is poor, there may be impact failures in subsequent use process, influence the service life of product.
Currently, in order to control the uniformity of the tissue of the through-thickness in hot rolled steel plate, using heat usually after rolling
Treatment process carries out tissue modulation to product.But tissue is regulated and controled using heat treatment process, necessarily increases workload and life
Produce cost.
Summary of the invention
The technical problems to be solved by the present invention are: providing one kind by improving to rolling process and its parameter
The milling method of effective control high tensile hot rolled steel sheet structural homogenity.
Used technical solution is to solve above-mentioned technical problem: a kind of control high tensile hot rolled steel sheet structural homogenity
Milling method, the milling method includes that samming heated for controlling temperature difference is come out of the stove, the reversible roughing mill middling speed roughing of four-roller, seven racks
The several steps of cooling under the conditions of the finish rolling of tandem mill surface temperature-controlled and section cooling unit control internal and external temperature,
Wherein, in the reversible roughing mill middling speed rough rolling process of four-roller, four roll reversing roller inlet high pressure water de-scalings spray is opened
Mouth carries out de-scaling and cooling to belt steel surface, reduces belt steel surface temperature by 80~120 DEG C.
Further, come out of the stove in process in samming heated for controlling temperature difference, width of plate slab when coming out of the stove, length, thickness direction
Maximum temperature difference is controlled at 20 DEG C or less.
The preferred mode of the above solution is that when coming out of the stove, width of plate slab, length, thickness direction maximum temperature difference control
Between 15~18 DEG C.
Further, the mill speed of four roll reversing rollers is in the reversible roughing mill middling speed roughing operation of four-roller
2.0m/S~3.0m/s.
Further, the surface temperature for being rolled steel plate uses in seven frame tandem mill surface temperature-controlled finishing rolling steps
The water injector for being exclusively used in seven frame tandem mills carries out water-spraying control to the entrance roll gap of each rack, drops belt steel surface temperature
Low 40~60 DEG C.
Further, flowing in the cooling process under the conditions of cooling down unit control internal and external temperature, cooling nozzles boiled water state is
One is opened every three, the temperature difference control at belt steel surface and center is within 80 DEG C.
The beneficial effects of the present invention are: milling method provided by the present application is with the steel plate of various processes during controlled rolling
Based on temperature, come out of the stove by samming heated for controlling temperature difference, the reversible roughing mill middling speed roughing of four-roller, seven frame tandem mill surface temperature-controlleds
Several steps such as the cooling under the conditions of finish rolling and section cooling unit control internal and external temperature, by belt steel surface and central tissue's crystal grain
Degree difference control is providing within series.Especially in the reversible roughing mill middling speed rough rolling process of four-roller, open that four-roller is reversible rolls
Machine inlet high pressure water descaling jet carries out de-scaling and cooling to belt steel surface, reduces belt steel surface temperature by 80~120 DEG C, thus
Realize that the application can effectively control high tensile hot rolled steel sheet even tissue by improving to rolling process and its parameter
The purpose of property.Further, more excellent strip is controlled in order to provide surface and central tissue's grain size difference, it can be by table
Face and central tissue's grain size difference control within 0.5 grade, rolling speed of the application also to the heating before hot rolling, when roughing
The difference of degree, the internal and external temperature of steel band when cooling range and section cooling when finish rolling has carried out accurate control, that is, passes through
Heating, rolling and effective combination of cooling means provide the band of surface and the control of central tissue's grain size difference within 0.5 grade
Steel to meet the needs that tissue grain size difference controls demanding client, while can also be dropped by the control of above-mentioned technique
Low rolling cost saves rolling operation length, the low cost production of high quality hot-rolling high-strength steel plate is realized, to improve the city of product
Field competitiveness.
Specific embodiment
In order to solve the application background technique, it is provided by the invention it is a kind of by rolling process and
Its parameter improves the milling method that can effectively control high tensile hot rolled steel sheet structural homogenity.The milling method
It comes out of the stove including samming heated for controlling temperature difference, the reversible roughing mill middling speed roughing of four-roller, seven frame tandem mill surface temperature-controlled finish rolling and layer
Flow the several steps of cooling under the conditions of cooling unit control internal and external temperature, wherein in the reversible roughing mill middling speed rough rolling process of four-roller,
It opens four roll reversing roller inlet high pressure water descaling jets and de-scaling and cooling is carried out to belt steel surface, make the reduction of belt steel surface temperature
80~120 DEG C.Milling method provided by the present application is based on the steel billet temperature of various processes during controlled rolling, by equal
Warm heated for controlling temperature difference is come out of the stove, the reversible roughing mill middling speed roughing of four-roller, seven frame tandem mill surface temperature-controlled finish rolling and section cooling
Several steps such as the cooling under the conditions of unit control internal and external temperature are providing belt steel surface and the control of central tissue's grain size difference
Within series.Especially in the reversible roughing mill middling speed rough rolling process of four-roller, four roll reversing roller inlet high pressure water de-scalings are opened
Nozzle carries out de-scaling and cooling to belt steel surface, reduces belt steel surface temperature by 80~120 DEG C, thus realize the application by pair
Rolling process and its parameter improve the purpose that can effectively control high tensile hot rolled steel sheet structural homogenity.
In above embodiment, in order to further control the high tensile hot rolled steel sheet tissue uniformity, mention
More excellent strip is controlled for surface and central tissue's grain size difference, it can be by surface and the difference control of central tissue's grain size
System high tensile hot rolled steel sheet, i.e. steel band described in beneficial effect within 0.5 grade, the application is also to the heating before hot rolling, slightly
The difference of mill speed when rolling, the internal and external temperature of steel band when cooling range and section cooling when finish rolling has carried out accurately
Control is effectively implemented in combination with the purpose by heating, rolling and cooling means, i.e., by surface and central tissue's crystal grain
Difference control is spent within 0.5 grade.Specifically, come out of the stove in process in samming heated for controlling temperature difference, width of plate slab when coming out of the stove, length,
The maximum temperature difference of thickness direction is controlled at 20 DEG C or less.At this point, the preferred control range of maximum temperature difference when coming out of the stove is slab
Width, length, thickness direction maximum temperature difference control between 15~18 DEG C.In the reversible roughing mill middling speed roughing operation of four-roller
In, the mill speed of four roll reversing rollers is 2.0m/S~3.0m/s.In seven frame tandem mill surface temperature-controlled finishing rolling steps, quilt
The surface temperature of rolled plate sprays the entrance roll gap of each rack using the water injector for being exclusively used in seven frame tandem mills
Water is cooling, reduces belt steel surface temperature by 40~60 DEG C.In cooling process under the conditions of section cooling unit control internal and external temperature,
Cooling nozzles boiled water state is that one is opened every three, and the temperature difference control at belt steel surface and center is within 80 DEG C.
It is had further the advantage that in conclusion providing milling method using the application, i.e., it is high for existing think gauge hot rolling
The deficiency of strong steel plate structural homogeneity control method realizes tensile strength by effective combination of heating, rolling and cooling means
The high level control of the structural homogenity of 500MPa and the above think gauge hot-rolling high-strength steel, belt steel surface and central tissue's grain size
Difference controls within 0.5 grade, to meet the needs that tissue grain size difference controls demanding client.Pass through above-mentioned work simultaneously
The control of skill can also reduce rolling cost, save rolling operation length, realize that the low cost of high quality hot-rolling high-strength steel plate is raw
It produces, to improve the competitiveness of product in market.
Embodiment one:
Tensile strength 560MPa hot-rolling high-strength steel, product thickness 16.0mm, tissue are rolled by 230.0mm slab hot rolling raw material
Uniformity control method:
1. the slab for producing hot-rolling high-strength steel is heated in combination type heating furnace, control slab heating temperature is uniform
Property, the maximum temperature difference control of width of plate slab, length, thickness direction is at 18 DEG C or less when coming out of the stove；
2. a kind of hot-rolling high-strength steel plate structural homogeneity control method carries out roughing to slab using the reversible roughing mill of four-roller
Rolling.Four roll reversing roller mill speeds are controlled in 2.0m/S in the operation of rolling.
3. a kind of hot-rolling high-strength steel plate structural homogeneity control method carries out roughing to slab using the reversible roughing mill of four-roller
Rolling.Open during each passes four roll reversing roller inlet high pressure water descaling jets to belt steel surface carry out de-scaling and
It is cooling, reduce belt steel surface temperature by 95 DEG C.
4. a kind of hot-rolling high-strength steel plate structural homogeneity control method, rolls strip using seven frame tandem mills.
In the operation of rolling, carrying out water-spraying control to each rack entrance roll gap using dedicated water injector reduces belt steel surface temperature 55
℃。
5. a kind of hot-rolling high-strength steel plate structural homogeneity control method is used through seven rack mm finishing mill unit rolling and high-temperature strips
Section cooling unit is cooled down, and wherein cooling nozzles boiled water state is every three to open one, makes belt steel surface and center
Temperature difference controls within 40 DEG C.
It, can be by the hot-rolling high-strength steel surface and center of thickness 16.0mm, tensile strength 560MPa using above-mentioned technology
Organize the control of grain size difference at 0.5 grade.
Embodiment two:
Tensile strength 700MPa hot-rolling high-strength steel is rolled by 230.0mm slab hot rolling raw material, product thickness 12.0mm, remnants are answered
Force control method:
1. the slab for producing hot-rolling high-strength steel is heated in combination type heating furnace, control slab heating temperature is uniform
Property, the maximum temperature difference control of width of plate slab, length, thickness direction is at 15 DEG C or less when coming out of the stove；
2. a kind of hot-rolling high-strength steel plate structural homogeneity control method carries out roughing to slab using the reversible roughing mill of four-roller
Rolling.Four roll reversing roller mill speeds are controlled in 2.5m/S in the operation of rolling.
3. a kind of hot-rolling high-strength steel plate structural homogeneity control method carries out roughing to slab using the reversible roughing mill of four-roller
Rolling.Open during each passes four roll reversing roller inlet high pressure water descaling jets to belt steel surface carry out de-scaling and
It is cooling, reduce belt steel surface temperature by 115 DEG C.
4. a kind of hot-rolling high-strength steel plate structural homogeneity control method, rolls strip using seven frame tandem mills.
In the operation of rolling, carrying out water-spraying control to each rack entrance roll gap using dedicated water injector reduces belt steel surface temperature 45
℃。
5. a kind of hot-rolling high-strength steel plate structural homogeneity control method is used through seven rack mm finishing mill unit rolling and high-temperature strips
Section cooling unit is cooled down, and wherein cooling nozzles boiled water state is every three to open one, makes belt steel surface and center
Temperature difference controls within 30 DEG C.
It, can be by the hot-rolling high-strength steel surface and center of thickness 12.0mm, tensile strength 700MPa using above-mentioned technology
Organize the control of grain size difference at 0.4 grade.
Claims (6)
1. a kind of milling method for controlling high tensile hot rolled steel sheet structural homogenity, it is characterised in that: the milling method packet
It includes samming heated for controlling temperature difference to come out of the stove, the reversible roughing mill middling speed roughing of four-roller, seven frame tandem mill surface temperature-controlled finish rolling and laminar flow
The several steps of cooling under the conditions of cooling unit control internal and external temperature,
Wherein, in the reversible roughing mill middling speed rough rolling process of four-roller, four roll reversing roller inlet high pressure water descaling jets pair are opened
Belt steel surface carries out de-scaling and cooling, reduces belt steel surface temperature by 80~120 DEG C.
2. the milling method of control high tensile hot rolled steel sheet structural homogenity according to claim 1, it is characterised in that:
Samming heated for controlling temperature difference is come out of the stove in process, width of plate slab when coming out of the stove, length, thickness direction maximum temperature difference control 20 DEG C with
Under.
3. the milling method of control high tensile hot rolled steel sheet structural homogenity according to claim 2, it is characterised in that: go out
When furnace, width of plate slab, length, thickness direction maximum temperature difference control between 15~18 DEG C.
4. the milling method of control high tensile hot rolled steel sheet structural homogenity according to claim 1, it is characterised in that:
In the reversible roughing mill middling speed roughing operation of four-roller, the mill speed of four roll reversing rollers is 2.0m/S~3.0m/s.
5. the milling method of control high tensile hot rolled steel sheet structural homogenity according to claim 1, it is characterised in that:
In seven frame tandem mill surface temperature-controlled finishing rolling steps, the surface temperature of rolled steel plate is using the spray for being exclusively used in seven frame tandem mills
Water installations carry out water-spraying control to the entrance roll gap of each rack, reduce belt steel surface temperature by 40~60 DEG C.
6. the milling method of control high tensile hot rolled steel sheet structural homogenity according to claim 1, it is characterised in that:
In cooling process under the conditions of section cooling unit control internal and external temperature, cooling nozzles boiled water state is to open one every three, band
Steel surface and the control of the temperature difference at center are within 80 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810661642.4A CN108941213B (en) | 2018-06-25 | 2018-06-25 | Rolling method for controlling structural uniformity of high-strength hot-rolled steel plate |
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| CN201810661642.4A CN108941213B (en) | 2018-06-25 | 2018-06-25 | Rolling method for controlling structural uniformity of high-strength hot-rolled steel plate |
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| CN108941213B CN108941213B (en) | 2020-02-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110527809A (en) * | 2019-08-26 | 2019-12-03 | 武汉科技大学 | Reduce the hot-rolled high-strength strip preparation method of residual stress |
| CN110586663A (en) * | 2019-09-04 | 2019-12-20 | 鞍钢股份有限公司 | Production method for reducing temperature drop of hot-rolled intermediate billet |
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| CN1864878A (en) * | 2005-05-20 | 2006-11-22 | 中冶东方工程技术有限公司 | Compact medium-width strip steel production process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110527809A (en) * | 2019-08-26 | 2019-12-03 | 武汉科技大学 | Reduce the hot-rolled high-strength strip preparation method of residual stress |
| CN110586663A (en) * | 2019-09-04 | 2019-12-20 | 鞍钢股份有限公司 | Production method for reducing temperature drop of hot-rolled intermediate billet |
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| CN108941213B (en) | 2020-02-18 |
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Effective date of registration: 20220629 Address after: 610306 Chengdu City, Chengdu, Sichuan, China (Sichuan) free trade test zone, Chengdu City, Qingbaijiang District, xiangdao Boulevard, Chengxiang Town, No. 1509 (room 13, A District, railway port mansion), room 1319 Patentee after: Chengdu advanced metal material industry technology Research Institute Co.,Ltd. Patentee after: Panzhihua Iron and Steel Group Panzhihua iron and Steel Research Institute Co., Ltd. Address before: 617000 Taoyuan street, East District, Panzhihua, Sichuan Province, No. 90 Patentee before: PANGANG GROUP PANZHIHUA IRON & STEEL RESEARCH INSTITUTE Co.,Ltd. |