CN102161079A - Manufacturing process of high-quality wide and thick plate blank - Google Patents
Manufacturing process of high-quality wide and thick plate blank Download PDFInfo
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- CN102161079A CN102161079A CN 201010603797 CN201010603797A CN102161079A CN 102161079 A CN102161079 A CN 102161079A CN 201010603797 CN201010603797 CN 201010603797 CN 201010603797 A CN201010603797 A CN 201010603797A CN 102161079 A CN102161079 A CN 102161079A
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Abstract
The invention relates to the field of wide and thick plate blanks for a wide and thick plate mill, in particular to a manufacturing process of a high-quality wide and thick plate blank, which is used for manufacturing a wide and thick plate blank for a wide and thick plate mill and solving the problems of higher manufacturing cost, lower efficiency and the like in the prior art, wherein the thickness of the wide and thick plate blank is 350 to 1,200mm. A water-cooling moving die is separately arranged on the front, back, left and right four faces of a tool water-cooling chassis; and the water-cooling moving dies arranged on the front, back, left and right four faces and the water-cooling chassis arranged on the lower part form a combined water-cooling die. The wide and thick plate blank is manufactured by using a high-efficiency water-cooling blank casting machine; and the high-efficiency blank casting machine adopts a hydraulic power system to extrude a casting blank, so that the wide and thick plate blank is solidified and crystallized under the action of a pressure, and internal shrinkage cavities and looseness of the wide and thick plate blank are eliminated. At the same time, a clearance between the die and the casting blank is controlled, the interface heat exchange coefficient between the casting blank and the die is adjusted, and surface cracks of the wide and thick plate blank are eliminated, by using the hydraulic power system, so the wide and thick plate blank with high quality is obtained finally.
Description
Technical field
The present invention relates to wide and heavy plate mill with generous slab field, the generous slab manufacturing process of specifically a kind of high-quality.
Background technology
Wide and Thick Slab is widely used in China's economic construction, on large ship, ocean platform, Hydropower Unit, fired power generating unit and long-distance pipeline, all uses Wide and Thick Slab in a large number.China is in the recent period newly-built tens of Wide and Thick Slab steel rolling production-lines comprise Anshan iron and steel plant 5000mm, 5500mm milling train, Baosteel 5000mm milling train etc., more than 2,000 ten thousand tons of newly-increased production capacities.
Generally, the applied environment of Wide and Thick Slab is more abominable, requires Wide and Thick Slab to have higher intensity and performance uniformity, and the key of decision Wide and Heavy Plates performance is generous slab.Have only generous slab thickness enough big, heavy slab thickness reaches 5: 1 with finished steel plate thickness ratio, just can make steel plate in the operation of rolling, obtain enough forging ratios, carry out crystallization fully again, crystal grain obtains abundant refinement, and the slab casting defective obtains healing, thereby the assurance plate property satisfies the flaw detection requirement.
The source of heavy slab mainly contains continuous casting billet, static ingot and electroslag remelting steel ingot now.The continuous casting billet maximum ga(u)ge that the continuous casting mode is poured into a mould generally is no more than 350mm.Owing to be subjected to the restriction of forging ratio, use the rolling steel plate of continuous casting billet, general thickness is no more than 100mm, otherwise plate property just can not get guaranteeing.Static ingot must pass through the hydraulic press cogging, just can obtain heavy slab, and the expense of hydraulic press cogging has increased the manufacturing cost of slab by a relatively large margin more than 3000 yuan/ton.Electroslag remelting steel ingot can prepare the high-quality heavy slab, and still, slab of electroslag remelting approximately needs 30 hours, and efficient is very low, and melting expense height.
Summary of the invention
The object of the present invention is to provide the manufacturing process of the generous slab of a kind of high-quality, solve problems such as manufacturing cost is higher in the prior art, efficient is lower.
Based on this purpose, technical scheme of the present invention is:
The generous slab manufacturing process of a kind of high-quality, generous slab solidifies in the die cavity of being made up of the water-cooled chassis combined type water-cooled mould of all around water-cooled dynamic model and bottom; The water-cooled mould of split setting adopts hydraulic power system to drive, and realizes moving forward and backward of water-cooled dynamic model, regulates interface heat exchange coefficient between the two by changing slit between generous slab and water-cooled dynamic model, solidifies fully until generous slab.
The generous slab manufacturing process of described high-quality, when 10-60min or generous slab solidified layer thickness reached 20-300mm after pouring metal melt finished, utilize hydraulic power system, split water-cooled dynamic model is pushed ahead, cylinder pressure gradually raises, generous slab is pushed, and the extruding force that generous slab single face is subjected to is the 50-400 ton; Promote split type water-cooled dynamic model and move forward 3-20mm, hydraulic cylinder pressurize 20-150min reduces the slit between generous steel slab surface and the mould as far as possible then, makes the two keep closely contact, strengthens interfacial heat exchange;
Behind the hydraulic cylinder pressurize 20-150min, reduce cylinder pressure, and the water-cooled dynamic model is separated with generous slab, make the gap between the two reach 2-30mm, reduce the interface heat exchange coefficient between generous slab and the mould.
The generous slab manufacturing process of described high-quality is poured into melted molten metal in the die cavity by long nozzle, and the metal bath surface that long nozzle is followed in the die cavity in the casting process moves up gradually, is watered full fully until metal mold cavity.
The generous slab manufacturing process of described high-quality, monitoring Wide and Thick Slab blank outer surface temperature is implemented moving forward and backward of water-cooled dynamic model repeatedly, solidifies fully until generous slab.
The invention has the beneficial effects as follows:
1. to make thickness be between 350～1200mm in the present invention, weight is 20～70 tons generous slab, adopts the removable split water-cooled of open-close type mould to form generous slab coagulating type chamber, and generous slab solidifies in the water-cooled mould, setting rate is very fast, has improved generous slab density.
2. the present invention uses for reference and gently depresses know-why in the continuous casting production, in generous slab process of setting, adopts hydraulic power system that it is exerted pressure, and makes generous slab crystallization and freezing under pressure, reduces the generation of generous slab central pipe rarefaction defect.
3. generous slab early solidification, because solidification shrinkage, the slit between generous slab and the mould increases, at this moment, generous slab solidified layer thickness is less, under the ferrostatic pressure effect, cause generous steel slab surface to deform easily, produce " bulge ", and then cause the generation of surface heat crackle.The present invention adopts hydraulic power system that casting billet surface is exerted pressure at the casting blank solidification initial stage, improves generous slab interface heat exchange coefficient, increases strand and shows setting rate, and casting billet surface intensity is improved rapidly, can effectively prevent this generation of defects.
4. the present invention adopts hydraulic cylinder to change slit between generous slab and the water-cooled dynamic model, regulates the interface heat exchange coefficient between the two.When casting blank surface temperature is low, increase the gap between generous slab and the mould, reduce interface heat exchange coefficient, avoid the low excessively face crack that brings out of casting blank surface temperature.
5. solidify the later stage, increase the slit between generous slab and the water-cooled dynamic model, reduce the coefficient of heat transfer, can reduce generous slab thermograde from inside to outside, improve the not feeding capacity of frozen metal liquid of generous slab center, reduce generous slab core shrinkage cavity rarefaction defect.
6, the scope of application of the present invention is wider, mainly is applicable to straight carbon steel, deck of boat steel, mould steel and water power, the nuclear power wide heavy slab manufacturing of steel.
In a word, the present invention adopts automatic strand machine mode to make heavy slab, and adopts hydraulic cylinder that generous slab is exerted pressure, and makes generous slab carry out crystallization and freezing under pressure, improved generous slab interior solid degree, the generation that has effectively alleviated the internal shrinkage rarefaction defect.Simultaneously,, regulate the interface heat exchange coefficient between the two, prevent that generous steel slab surface from cracking by the slit between hydraulic power system change water-cooled dynamic model and the generous slab.
Description of drawings
Fig. 1 is generous slab worker dress schematic diagram;
Among the figure, the 1-insulated feeder; 2-water-cooled dynamic model; Cover in the 3-water-cooled; The 4-long nozzle; The 5-hydraulic cylinder; The 6-water-cooled chassis.
Fig. 2 is generous slab exemplar schematic diagram;
Fig. 3 is generous slab low power pickling organization chart.
The specific embodiment
As shown in Figure 1, the generous slab worker dress of the present invention comprises insulated feeder 1, water-cooled dynamic model 2, the interior cover 3 of water-cooled, long nozzle 4, hydraulic cylinder 5, water-cooled chassis 6 etc. and the hydraulic power system that external force is provided.Concrete structure is as follows:
Four sides split all around on the water-cooled chassis 6 is provided with water-cooled dynamic model 2, and all around four sides water-cooled dynamic model 2 that is provided with and the water-cooled chassis of deploying down 6 forms combined type water-cooled mould, and the die cavity of this combined type water-cooled mould is used for the shaping of generous slab.The top of this combined type water-cooled mould is provided with insulated feeder 1, long nozzle 4 reaches in the die cavity of combined type water-cooled mould from the top of combined type water-cooled mould, water-cooled dynamic model 2 inboards of four sides setting all around are provided with cover 3 in the water-cooled, the water-cooled dynamic model 2 arranged outside hydraulic cylinders 5 of four sides setting all around, hydraulic cylinder 5 connects hydraulic power systems.
The generous slab manufacturing process of high-quality of the present invention is as follows:
As shown in Figure 1, generous slab solidifies in the die cavity of being made up of the water-cooled chassis 6 combined type water-cooled moulds of all around water-cooled dynamic model 2 and bottom.Melted molten metal is poured in the die cavity by long nozzle 4, and the metal bath surface that long nozzle is followed in the die cavity in the casting process moves up gradually, is watered full fully until metal mold cavity.Generous slab cast finishes back 10-60min, when the outer surface solidified layer thickness reaches 20-300 (being preferably 50-200) mm, hydraulic cylinder 7 beginnings increase pressure gradually, and promotion water-cooled dynamic model 2, water-cooled dynamic model 2 moves forward 3-20mm under pressure-driven, generous slab is pushed, make between generous steel slab surface and the water-cooled dynamic model 2 to fit tightly, improve the interface heat exchange coefficient between the two.Solidify the later stage, hydraulic cylinder 5 oppositely pressurizes, and water-cooled dynamic model 2 is moved backward, increases gap between generous slab and the water-cooled dynamic model 2 to 2-30mm, reduces interface heat exchange coefficient, and generous slab surface temperature is raise, and avoids temperature to cross low generation face crack.Monitor generous slab surface temperature, when casting blank surface temperature surpasses 1000 ℃, water-cooled dynamic model 2 is moved forward, make it to fit, increase interface heat exchange coefficient with generous steel slab surface.After treating that generous slab solidifies fully, remove the water-cooled assembling die, generous slab heat is delivered in the heat-treatment furnace and is annealed.
Embodiment 1
Slab material: Q345E;
Slab thickness: 500mm;
Molten steel gross weight: 30 tons;
The duration of pouring: 15min;
Hydraulic cylinder pressing time: cast finishes back 20min, increases cylinder pressure gradually.
Generous slab single face maximum pressure: each water-cooled dynamic model is arranged 4 hydraulic cylinders, and the maximum pressure that single hydraulic cylinder applies is 30 tons, and the maximum pressure that generous slab single face bears is 120 tons.
Water-cooled dynamic model forward pitch is from 5mm.
Hydraulic cylinder dwell time: 40min, after pressurize finished, hydraulic cylinder was oppositely exerted pressure, and the water-cooled dynamic model is separated with generous slab.
Gap between generous slab and water-cooled dynamic model: 10mm.
By implementing above technology, the generous slab dense internal organization of production, no shrinkage cavity rarefaction defect, the surface does not crack yet.
Slab material: EH36;
Slab thickness: 1000mm;
Molten steel gross weight: 60 tons;
The duration of pouring: 30min;
Hydraulic cylinder pressing time: cast finishes back 50min, increases cylinder pressure gradually.
Generous slab single face maximum pressure: each water-cooled dynamic model is arranged 4 hydraulic cylinders, and the maximum pressure that single hydraulic cylinder applies is 90 tons, and the maximum pressure that generous slab single face bears is 360 tons.
Water-cooled dynamic model forward pitch is from 12mm.
Hydraulic cylinder dwell time: 90min, after pressurize finished, hydraulic cylinder was oppositely exerted pressure, and the water-cooled dynamic model is separated with generous slab.
Gap between generous slab and water-cooled dynamic model: 15mm.
Follow-up by the discovery of monitoring casting blank surface temperature, casting blank surface temperature has bigger rise, about 1050 ℃ of maximum temperature, promote the water-cooled dynamic model forward by hydraulic cylinder once more, mould and generous steel slab surface are fitted tightly, increase interface heat exchange coefficient, improve cooling velocity.This time single hydraulic cylinder maximum pressure is 80 tons, and the dwell time is 60min.Solidify the later stage, move after making the water-cooled dynamic model, regulate clearance control between generous slab and water-cooled dynamic model between 8-15mm, solidify fully, go into furnace annealing until generous slab.
As shown in Figures 2 and 3, by implementing the generous slab of above explained hereafter, dense internal organization, no shrinkage cavity rarefaction defect, the surface does not crack yet.
Comparative example
Adopt molten steel of the same race to pour into a mould, after the cast, in cooling procedure, keep the water-cooled dynamic model motionless.And under the constant situation of other condition, find that riser feeding is good, heavy slab does not have shrinkage cavity, loose.But, in the heavy slab middle part, two crackles have appearred.Think by analysis, this crack due to thermal stress, mainly be since slab in cooling procedure, at the cooling back segment, intensity of cooling is excessive, the steel slab surface temperature is low excessively to be caused.By with the comparison of above two embodiment, given prominence among the present invention and regulated mould and generous slab gap, the technology superiority of change interface heat exchange coefficient by hydraulic cylinder.
To sum up, solidify early stage, give the certain thrust of combined type water-cooled dynamic model, water-cooled dynamic model and steel slab surface are fitted, increase interfacial heat exchange, improve cooling velocity, make generous slab crystallization and freezing under pressure simultaneously at generous slab; Solidify the later stage, the water-cooled dynamic model is moved backward, form the slit before water-cooled dynamic model and the slab, reduce the coefficient of heat transfer, reduce cooling velocity.It is loose both can to have reduced or eliminate generous slab central pipe by this technology, can avoid the generation of face crack again, has finally obtained high-quality generous slab.
Claims (4)
1. generous slab manufacturing process of high-quality is characterized in that: generous slab solidifies in the die cavity of being made up of the water-cooled chassis combined type water-cooled mould of all around water-cooled dynamic model and bottom; The water-cooled mould of split setting adopts hydraulic power system to drive, and realizes moving forward and backward of water-cooled dynamic model, regulates interface heat exchange coefficient between the two by changing slit between generous slab and water-cooled dynamic model, solidifies fully until generous slab.
2. according to the generous slab manufacturing process of the described high-quality of claim 1, it is characterized in that: when 10-60min or generous slab solidified layer thickness reached 20-300mm after pouring metal melt finished, utilize hydraulic power system, split water-cooled dynamic model is pushed ahead, cylinder pressure gradually raises, generous slab is pushed, and the extruding force that generous slab single face is subjected to is the 50-400 ton; Promote split type water-cooled dynamic model and move forward 3-20mm, hydraulic cylinder pressurize 20-150min reduces the slit between generous steel slab surface and the mould as far as possible then, makes the two keep closely contact, strengthens interfacial heat exchange;
Behind the hydraulic cylinder pressurize 20-150min, reduce cylinder pressure, and the water-cooled dynamic model is separated with generous slab, make the gap between the two reach 2-30mm, reduce the interface heat exchange coefficient between generous slab and the mould.
3. according to the generous slab manufacturing process of the described high-quality of claim 1, it is characterized in that: melted molten metal is poured in the die cavity by long nozzle, the metal bath surface that long nozzle is followed in the die cavity in the casting process moves up gradually, is watered full fully until metal mold cavity.
4. according to claim 1 or the generous slab manufacturing process of 2 described high-quality, it is characterized in that: monitoring Wide and Thick Slab blank outer surface temperature, implement moving forward and backward of water-cooled dynamic model repeatedly, solidify fully until generous slab.
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| CN2010106037976A CN102161079B (en) | 2010-12-23 | 2010-12-23 | Manufacturing process of high-quality wide and thick plate blank |
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| CN2010106037976A CN102161079B (en) | 2010-12-23 | 2010-12-23 | Manufacturing process of high-quality wide and thick plate blank |
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| CN102161079A true CN102161079A (en) | 2011-08-24 |
| CN102161079B CN102161079B (en) | 2012-11-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105170951A (en) * | 2015-09-15 | 2015-12-23 | 辽宁科技大学 | Two-way extrusion type thick slab directional solidification method and device thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6033852A (en) * | 1983-08-01 | 1985-02-21 | Kawasaki Steel Corp | Casting mold for ingot making |
| JPS6056447A (en) * | 1983-09-06 | 1985-04-02 | Kawasaki Steel Corp | Casting mold for ingot making |
| CN101543877A (en) * | 2009-05-11 | 2009-09-30 | 南阳汉冶特钢有限公司 | Device using water-cooling crystallizer as ingot mold |
| CN101791682A (en) * | 2010-04-08 | 2010-08-04 | 中冶京诚工程技术有限公司 | Manufacturing device of ultra-large type special thick plate rectangular ingotblank |
-
2010
- 2010-12-23 CN CN2010106037976A patent/CN102161079B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6033852A (en) * | 1983-08-01 | 1985-02-21 | Kawasaki Steel Corp | Casting mold for ingot making |
| JPS6056447A (en) * | 1983-09-06 | 1985-04-02 | Kawasaki Steel Corp | Casting mold for ingot making |
| CN101543877A (en) * | 2009-05-11 | 2009-09-30 | 南阳汉冶特钢有限公司 | Device using water-cooling crystallizer as ingot mold |
| CN101791682A (en) * | 2010-04-08 | 2010-08-04 | 中冶京诚工程技术有限公司 | Manufacturing device of ultra-large type special thick plate rectangular ingotblank |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105170951A (en) * | 2015-09-15 | 2015-12-23 | 辽宁科技大学 | Two-way extrusion type thick slab directional solidification method and device thereof |
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| CN102161079B (en) | 2012-11-07 |
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Application publication date: 20110824 Assignee: Jiangsu Sunan Heavy Industry Machinery Technology Co., Ltd. Assignor: Institute of metal research, Chinese Academy of Sciences Contract record no.: 2014210000003 Denomination of invention: Manufacturing process of high-quality wide and thick plate blank Granted publication date: 20121107 License type: Exclusive License Record date: 20140120 |