CN108500065A - A kind of controlled rolling method of low compression ratio thick steel plates - Google Patents
A kind of controlled rolling method of low compression ratio thick steel plates Download PDFInfo
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- CN108500065A CN108500065A CN201810154065.XA CN201810154065A CN108500065A CN 108500065 A CN108500065 A CN 108500065A CN 201810154065 A CN201810154065 A CN 201810154065A CN 108500065 A CN108500065 A CN 108500065A
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- compression ratio
- heating
- steel plates
- zerolling
- low compression
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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
-
- 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
- B21B37/58—Roll-force control; Roll-gap control
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of controlled rolling method of low compression ratio thick steel plates, the controlled rolling method includes heating of plate blank, zerolling, section cooling, aligning and heap cooling working procedure；The heating of plate blank process, 980~1080 DEG C of heating of plate blank holding temperature；The zerolling process, zerolling single pass reduction ratio use heavy reduction rate rolling, reduction ratio to control 12~26% using first small rear big control method, 1~2 percentage pass reduction, 3~8%, 3~6 passage.The present invention, using low-temperature heat technique, reduces the energy consumption of heating of plate blank process, improves economic benefit compared with traditional handicraft；Using zerolling technology, percentage pass reduction is controlled, it is ensured that the flaw detection qualification rate of final steel plate.The present invention realize compression ratio be 1.5~2.8, the production for the low compression ratio thick steel plates that specification is 100 300mm, ultrasonic flaw detection qualification rate is high.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of controlled rolling method of low compression ratio thick steel plates.
Background technology
In general, general in order to achieve the purpose that steel plate center portion is fine and close in Heavy Plate Production technical process at this stage
All over require steel plate compression ratio 3 or more, i.e., initial slab thickness H0With final steel plate thickness H ratios H0/H≥3.Compression ratio is less than 3
Low compression ratio steel plate rolling be Heavy Plate Production difficult point, compression ratio deficiency continuous casting steel billet internal defect group, which is woven in, to be rolled
It is difficult to achieve the effect that densification in journey, ultrasonic examination can be caused unqualified, steel plate is easy to scrap.
In existing technology, it is both provided in CN104017968B and CN103128247A patents a kind of dynamic using slab
The technology of state slighter compress produces the high-densit continuous casting steel billet of high quality, to realize the rolling of low compression ratio steel plate, it is ensured that steel plate
Flaw detection qualification rate.Obviously, this needs to put into new equipment, and cost is higher.And it also needs to use in CN104017968B patents
Normalizing is heat-treated, and production cost is high.Therefore, a kind of production method for the thick steel plates that production cost is low, flaw detection is qualified is researched and developed
It is urgent problem to be solved in the industry.
Invention content
The technical problem to be solved by the present invention is to a kind of controlled rolling method of low compression ratio thick steel plates, the present invention is logical
The production that special technology controlling and process realizes low compression ratio steel plate is crossed, compared with traditional handicraft, using low-temperature heat technique, is reduced
The energy consumption of heating of plate blank process, improves economic benefit.
In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of control of low compression ratio thick steel plates
Milling method processed, the controlled rolling method include heating of plate blank, zerolling, section cooling, aligning and heap cooling working procedure；It is described
Heating of plate blank process, 980~1080 DEG C of heating of plate blank holding temperature；The zerolling process, the pressure of zerolling single pass
Rate uses heavy reduction rate rolling, reduction ratio using first small rear big control method, 1~2 percentage pass reduction, 3~8%, 3~6 passage
Control is 12~26%.
Heating of plate blank process of the present invention determines that heating time, heating coefficient are 8~10min/ according to slab thickness
Cm, heating time be：Slab thickness × heating coefficient.
Zerolling process of the present invention, by de-scaling more than twice, de-scaling pressure >=18MPa starts table when rolling
Face temperature is at 900~980 DEG C.
Zerolling process of the present invention uses water-spraying control between rolling pass, and finishing temperature control is 780~880
℃。
Section cooling process of the present invention, final cooling temperature are controlled at 650~750 DEG C.
Aligning process of the present invention carries out straightening operation, it is ensured that steel plate flatness using straightener to steel plate.
Heap cooling working procedure of the present invention, the control of heap cold temperature is at 300~600 DEG C, heap cool time 12-72h.
The present invention realizes that compression ratio is the production of 1.5~2.8 steel plates.
The steel plate thickness specification of the method for the present invention production is 100-300mm.
Low compression ratio thick steel plates of the present invention are cooled to room temperature, and ultrasonic examination inspection is carried out according to 2970 standards of GB/T
It surveys.
It is using advantageous effect caused by above-mentioned technical proposal：1, the present invention is compared with traditional handicraft, using low temperature
Heating process reduces the energy consumption of heating of plate blank process, improves economic benefit.2, the present invention uses zerolling technology, control
Percentage pass reduction processed, it is ensured that the flaw detection qualification rate of final steel plate.3, the present invention realize compression ratio be 1.5~2.8, specification 100-
The production of the low compression ratio thick steel plates of 300mm, ultrasonic flaw detection qualification rate are high.
Specific implementation mode
With reference to specific embodiment, the present invention is described in further detail.
Embodiment 1
The present embodiment steel grade is SM45 mould steel, and the thickness of strand specification used is 450mm, compression ratio 1.5, final to roll
Steel plate thickness afterwards is 300mm；Production method includes heating of plate blank, zerolling, section cooling, aligning and heap cooling working procedure, tool
That steps are as follows is described for body technology：
（1）Heating of plate blank process：Using recuperative heater, 980 DEG C of heating and thermal insulation temperature, heating coefficient 10min/cm adds
Hot total time is 300min；
（2）Zerolling process：Using de-scaling three times, de-scaling pressure 18MPa, it is 900 DEG C to start steel slab surface temperature when rolling,
According to the reduction in pass controlled rolling passage and reduction ratio in table 1, it is ensured that deformation penetrates into center portion, and spray is used between rolling pass
Water cooling, finishing temperature control is at 840 DEG C；
1 embodiment of table, 1 rolling parameter
（3）Section cooling process：Steel plate at the uniform velocity passes through section cooling region, and surface of steel plate temperature is 650 DEG C after cooling；
（4）Align process：Steel plate aligns steel plate after section cooling, using straightener, it is ensured that the flatness of steel plate；
（5）Heap cooling working procedure：Steel plate is after straightener, and in 300 DEG C of surface temperature, offline heap is cold, according to GB/T after the cold 72h of heap
2970 standards carry out ultrasonic examination, and as a result display meets II grade of acceptance criteria.
Embodiment 2
The present embodiment steel grade is Q345B steel plates, and the thickness of strand specification used is 280mm, compression ratio 2.8, final to roll
Steel plate thickness afterwards is 100mm；Production method includes heating of plate blank, zerolling, section cooling, aligning and heap cooling working procedure, tool
That steps are as follows is described for body technology：
（1）Heating of plate blank process：Using recuperative heater, 1080 DEG C of heating and thermal insulation temperature, heating coefficient 8min/cm adds
Hot total time is 224min；
（2）Zerolling process：Using secondary descaling steel, de-scaling pressure 20MPa, it is 980 DEG C to start steel slab surface temperature when rolling,
According to the reduction in pass controlled rolling passage and reduction ratio in table 2, it is ensured that deformation penetrates into center portion, and spray is used between rolling pass
Water cooling, finishing temperature control is at 880 DEG C；
2 embodiment of table, 2 rolling parameter
（3）Section cooling process：Steel plate at the uniform velocity passes through section cooling region, and surface of steel plate temperature is 750 DEG C after cooling；
（4）Align process：Steel plate aligns steel plate after section cooling, using straightener, it is ensured that the flatness of steel plate；
（5）Heap cooling working procedure：Steel plate is after straightener, and in 600 DEG C of surface temperature, offline heap is cold, according to GB/T after the cold 12h of heap
2970 standards carry out ultrasonic examination, and as a result display meets I grade of acceptance criteria.
Embodiment 3
The present embodiment steel grade is Q390GJC high building structure steel, and for 300mm, compression ratio is the thickness of strand specification used
2.0, the steel plate thickness after final rolling is 150mm；Production method include heating of plate blank, zerolling, section cooling, aligning and
Heap cooling working procedure, specific process step are as described below：
（1）Heating of plate blank process：Using recuperative heater, 1050 DEG C of heating and thermal insulation temperature, heating coefficient 9min/cm adds
Hot total time is 270min；
（2）Zerolling process：Using de-scaling three times, de-scaling pressure 21MPa, it is 950 DEG C to start steel slab surface temperature when rolling,
According to the reduction in pass controlled rolling passage and reduction ratio in table 3, it is ensured that deformation penetrates into center portion, and spray is used between rolling pass
Water cooling, finishing temperature control is at 860 DEG C；
3 embodiment of table, 3 rolling parameter
（3）Section cooling process：Steel plate at the uniform velocity passes through section cooling region, and surface of steel plate temperature is 700 DEG C after cooling；
（4）Align process：Steel plate aligns steel plate after section cooling, using straightener, it is ensured that the flatness of steel plate；
（5）Heap cooling working procedure：Steel plate is after straightener, and in 500 DEG C of surface temperature, offline heap is cold, according to GB/T after the cold 48h of heap
2970 standards carry out ultrasonic examination, and as a result display meets I grade of acceptance criteria.
Embodiment 4
The present embodiment steel grade is Q345C carbon structural steels, and the thickness of strand specification used is 220mm, compression ratio 2.2, most
Steel plate thickness after finish to gauge system is 100mm；Production method includes heating of plate blank, zerolling, section cooling, aligning and the cold work of heap
Sequence, specific process step are as described below：
（1）Heating of plate blank process：Using recuperative heater, 1060 DEG C of heating and thermal insulation temperature, heating coefficient 10min/cm adds
Hot total time is 220min；
（2）Zerolling process：Using four de-scalings, de-scaling pressure 19MPa, it is 950 DEG C to start steel slab surface temperature when rolling,
According to the reduction in pass controlled rolling passage and reduction ratio in table 4, it is ensured that deformation penetrates into center portion, and spray is used between rolling pass
Water cooling, finishing temperature control is at 780 DEG C；
4 embodiment of table, 4 rolling parameter
（3）Section cooling process：Steel plate at the uniform velocity passes through section cooling region, and surface of steel plate temperature is 680 DEG C after cooling；
（4）Align process：Steel plate aligns steel plate after section cooling, using straightener, it is ensured that the flatness of steel plate；
（5）Heap cooling working procedure：Steel plate is after straightener, and in 550 DEG C of surface temperature, offline heap is cold, according to GB/T after the cold 48h of heap
2970 standards carry out ultrasonic examination, and as a result display meets I grade of acceptance criteria.
Embodiment 5
The present embodiment steel grade is Q390GJC high building structure steel, and for 250mm, compression ratio is the thickness of strand specification used
2.5, the steel plate thickness after final rolling is 100mm；Production method include heating of plate blank, zerolling, section cooling, aligning and
Heap cooling working procedure, specific process step are as described below：
（1）Heating of plate blank process：Using recuperative heater, 1000 DEG C of heating and thermal insulation temperature, heating coefficient 8min/cm adds
Hot total time is 200min；
（2）Zerolling process：Using secondary descaling steel, de-scaling pressure 20MPa, it is 930 DEG C to start steel slab surface temperature when rolling,
According to the reduction in pass controlled rolling passage and reduction ratio in table 5, it is ensured that deformation penetrates into center portion, and spray is used between rolling pass
Water cooling, finishing temperature control is at 830 DEG C；
5 embodiment of table, 5 rolling parameter
（3）Section cooling process：Steel plate at the uniform velocity passes through section cooling region, and surface of steel plate temperature is 710 DEG C after cooling；
（4）Align process：Steel plate aligns steel plate after section cooling, using straightener, it is ensured that the flatness of steel plate；
（5）Heap cooling working procedure：Steel plate is after straightener, and in 450 DEG C of surface temperature, offline heap is cold, heap it is cold for 24 hours after according to GB/T
2970 standards carry out ultrasonic examination, and as a result display meets I grade of acceptance criteria.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although with reference to above-described embodiment to this hair
It is bright to be described in detail, it will be understood by those of ordinary skill in the art that：Still can the present invention be modified or be waited
With replacing, without departing from the spirit or scope of the invention, or any substitutions, the power in the present invention should all be covered
In sharp claimed range.
Claims (8)
1. a kind of controlled rolling method of low compression ratio thick steel plates, which is characterized in that the controlled rolling method includes plate
Base heating, zerolling, section cooling, aligning and heap cooling working procedure；The heating of plate blank process, heating of plate blank holding temperature 980
~1080 DEG C；The zerolling process, zerolling single pass reduction ratio is using first small rear big control method, 1~2 passage
3~8%, 3~6 passage of reduction ratio uses heavy reduction rate rolling, reduction ratio to control 12~26%.
2. a kind of controlled rolling method of low compression ratio thick steel plates according to claim 1, which is characterized in that described
Heating of plate blank process, heating coefficient are 8~10min/cm, and heating time is：Slab thickness × heating coefficient.
3. a kind of controlled rolling method of low compression ratio thick steel plates according to claim 1, which is characterized in that described
Zerolling process, by de-scaling more than twice, de-scaling pressure >=18MPa starts surface of steel plate temperature 900~980 when rolling
℃。
4. a kind of controlled rolling method of low compression ratio thick steel plates according to claim 1, which is characterized in that described
Zerolling process uses water-spraying control between rolling pass, and finishing temperature control is at 780~880 DEG C.
5. a kind of controlled rolling method of low compression ratio thick steel plates according to any one of claims 1-4, special
Sign is that the section cooling process, final cooling temperature is controlled at 650~750 DEG C.
6. a kind of controlled rolling method of low compression ratio thick steel plates according to any one of claims 1-4, special
Sign is, the heap cooling working procedure, and the cold temperature control of heap is at 300~600 DEG C, heap cool time 12-72h.
7. a kind of controlled rolling method of low compression ratio thick steel plates according to any one of claims 1-4, special
Sign is that the method realizes that compression ratio is the production of 1.5~2.8 steel plates.
8. a kind of controlled rolling method of low compression ratio thick steel plates according to any one of claims 1-4, special
Sign is that the steel plate thickness specification of the method production is 100-300mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810154065.XA CN108500065A (en) | 2018-02-22 | 2018-02-22 | A kind of controlled rolling method of low compression ratio thick steel plates |
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| CN201810154065.XA CN108500065A (en) | 2018-02-22 | 2018-02-22 | A kind of controlled rolling method of low compression ratio thick steel plates |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54116362A (en) * | 1978-03-01 | 1979-09-10 | Kawasaki Steel Co | Rolling control of low carbon low alloy thick steel plate |
| JP2009160650A (en) * | 2008-01-10 | 2009-07-23 | Jfe Steel Corp | Method of rolling plate and system for planning pass schedule of plate rolling |
| CN101701326A (en) * | 2009-10-28 | 2010-05-05 | 南京钢铁股份有限公司 | High strength and high toughness ship plate steel with thick specification and production method thereof |
| CN102517428A (en) * | 2011-12-23 | 2012-06-27 | 秦皇岛首秦金属材料有限公司 | Method for producing low compression ratio crack detection thick plate |
| CN103602888A (en) * | 2013-12-02 | 2014-02-26 | 南京钢铁股份有限公司 | Low-compression ratio hot-rolled 9Ni steel thick plate and manufacturing method thereof |
| CN103938108A (en) * | 2014-03-14 | 2014-07-23 | 济钢集团有限公司 | 460MPa-grade low-compression-ratio and high-toughness steel plate for ocean engineering, and its production method |
| CN104017968A (en) * | 2014-06-18 | 2014-09-03 | 济钢集团有限公司 | Low-compression-ratio method for producing heavy-gauge flaw-detection-maintaining steel plate |
-
2018
- 2018-02-22 CN CN201810154065.XA patent/CN108500065A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54116362A (en) * | 1978-03-01 | 1979-09-10 | Kawasaki Steel Co | Rolling control of low carbon low alloy thick steel plate |
| JP2009160650A (en) * | 2008-01-10 | 2009-07-23 | Jfe Steel Corp | Method of rolling plate and system for planning pass schedule of plate rolling |
| CN101701326A (en) * | 2009-10-28 | 2010-05-05 | 南京钢铁股份有限公司 | High strength and high toughness ship plate steel with thick specification and production method thereof |
| CN102517428A (en) * | 2011-12-23 | 2012-06-27 | 秦皇岛首秦金属材料有限公司 | Method for producing low compression ratio crack detection thick plate |
| CN103602888A (en) * | 2013-12-02 | 2014-02-26 | 南京钢铁股份有限公司 | Low-compression ratio hot-rolled 9Ni steel thick plate and manufacturing method thereof |
| CN103938108A (en) * | 2014-03-14 | 2014-07-23 | 济钢集团有限公司 | 460MPa-grade low-compression-ratio and high-toughness steel plate for ocean engineering, and its production method |
| CN104017968A (en) * | 2014-06-18 | 2014-09-03 | 济钢集团有限公司 | Low-compression-ratio method for producing heavy-gauge flaw-detection-maintaining steel plate |
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Application publication date: 20180907 |