CN103212573A - Production control method of Q345B steel plate shape - Google Patents
Production control method of Q345B steel plate shape Download PDFInfo
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- CN103212573A CN103212573A CN2013101174171A CN201310117417A CN103212573A CN 103212573 A CN103212573 A CN 103212573A CN 2013101174171 A CN2013101174171 A CN 2013101174171A CN 201310117417 A CN201310117417 A CN 201310117417A CN 103212573 A CN103212573 A CN 103212573A
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Abstract
The invention provides a production control method of a Q345B steel plate shape. A steel blank which is 220mm in height, 1,300mm in width and 1,700mm in length is heated in a steel-pushing type heating furnace, the temperature is kept for 38 to 43min at the temperature of 1,240 to 1,280 DEG C, the steel blank is taken out from the furnace at the temperature of 1,100 to 1,200 DEG C, the steel blank is rolled and de-scaled in a 4,200mm-four-roller roughing mill, the rolling temperature is 1,100+/-50 DEG C, and rolling is stopped when the steel blank is 54mm in thickness at the temperature of 1,000 to 1,200 DEG C; the steel plate is continuously rolled in a 3,500mm-four-roller finishing mill for 7 times, the rolling rate of the last time is less than or equal to 15 percent, the temperature of the last rolling is controlled to be between 800 DEG C and 860 DEG C; and after the steel plate is rolled, the steel plate is straightened in a straightening machine, wherein the temperature is controlled to be between 650 DEG C and 800 DEG C, the rolling amount is 1.5 to 3mm, the speed is 0.8m/s, and after being straightened by one time, the steel plate is trimmed and sized.
Description
Technical field
Thick Rolling Production technology in the present invention relates to is utilized the production of the steel-plate shape of this method control 8mm thickness Q345B, has outstanding productivity effect and using value.
Background technology
The Q345B steel grade belongs to low-alloy high-tensile structural steel, and this steel grade has good comprehensive mechanical properties and processing performance, is widely used on engineering.
Adopt needless to say warm hot rolling mode to carry out the production that thickness is 8mm Q345B steel plate, steel billet temperature sensitiveness is big near finished product thickness the time, easily cause the finishing temperature fluctuation bigger, cause steel plate occurring horizontal bilateral wave and flatness defect such as corrugation wave longitudinally when being shaped easily, certainly this defective can cold strong operation strong through online heat or off-line be saved, but follow-up straightening process brings difficulty, causes the bent waste product of wooden dipper easily.
At present domestic can online solution steel plate production process in the main manufacturer of wooden dipper song have: Xinyu steel mill, Jinan steel mill, Anyang steel mill, Chongqing steel mill; These steel mills mainly bear convexity by adjusting roll, memorial archway slide clearance size guarantees that steel plate distortion of both sides in the operation of rolling is even, reduce and scrape flatness defects such as frame, camber; Or continuation reduces slab thickness, the minimizing rolling pass guarantees the finishing temperature of steel plate in the operation of rolling on above basis, reduces the temperature sensitivity of steel plate at low thermophase, reaches the purpose of controlling steel-plate shape.The simple process that relies on the rolling pass means to produce the Q345B steel plate of 8mm thickness is not seen information dissemination as yet.
The thickness that the present invention designs production is the Q345B steel plate of 8mm, crucial technical parameters such as finishing temperature with the passage steel plate of the start rolling temperature of the rolling tonnage of temperature, finishing mill roll in the control billet heating furnace, finishing mill and open rolling thickness, finishing mill, the plate shape that guarantees steel plate is good, cooperate follow-up aligning and finishing procedure can obtain the qualified steel plate of plate shape, improve the first-time qualification rate of steel plate, for important exemplary role has been made in the innovation and the energy-saving and emission-reduction of enterprise.
Summary of the invention
Order of the present invention is: Q345B steel-plate shape control method is provided, can have well cooperated aligning, cold bed cooling and finishing type operation after rolling, obtain the qualified steel plate of plate shape.
The object of the present invention is achieved like this: a kind of production control method of Q345B steel-plate shape is that the steel plate of 8mm is an example with processing thickness;
Step 1 is selected the size of steel billet three-dimensional for use: high 220 mm * wide 1300 mm * long 1700mm;
Step 2 places pusher-type furnace to heat on steel billet, and temperature 1240-1280 ℃, insulation 38-43min, 1100-1200 ℃ of steel billet tapping temperature;
Step 3 steel billet is come out of the stove and is entered the rolling de-scaling of 4200mm four-high rougher, and start rolling temperature is 1100 ± 50 ℃, finishes the rolling of phase I in 1000-1200 ℃, and steel billet thickness stops rolling when 54mm; It is rolling that steel plate continues to enter the 3500mm four high finishing mill, and finish rolling is controlled to be 7 passages, and wherein the inferior reduction ratio of extreme trace is≤15%, and finishing temperature is controlled at 800-860 ℃; After steel plate rolling finishes, enter straightener and align, straightening temperature is controlled at 650-800 ℃, the aligning drafts is 1.5-3mm, and aligning speed is 0.8m/s, a time aligning, steel plate behind the aligning enters the roller-plate cold bed, enters shear line, implements to cut edge and the scale operation.
Technique effect of the present invention is: select for use cross section high by 220 * steel billet of wide 1300mm, place heating in the pusher-type furnace, to soaking zone temperature, time, the control of steel plate tapping temperature, and employing two-shipper shut die formula rolled plate, thickness, temperature control to the roughing ending phase, and to the control of the passage and the finishing temperature in finish rolling stage, particularly to behind the steel plate rolling, the control method of plate shapes such as straightening temperature, speed, drafts is very practical, be the utilization again of the old equipment of enterprise, the feasible program of having sought a technological improvement shows technological progress.
The specific embodiment
The present invention will be described further in conjunction with the embodiments.
Embodiment
With " slab heating → slab de-scaling → 4200mm milling train roughing → 3500mm milling train finish rolling → aligning → finishing → warehouse-in " technological process is example;
Concrete steps:
1) thickness is 8mm, and it is the steel billet of 220mm * 1300mm * 1700mm that the steel plate of width 2100mm is selected three-dimensional dimension for use;
2) heat in pusher-type furnace, temperature is heated to 1280 ℃, insulation 40min, guarantee 1200 ℃ of steel billet tapping temperatures, be sent to De-scaling box after steel billet is come out of the stove at once and carry out de-scaling, de-scaling de-scaling water pressure is not less than 16MPa, removes the iron scale of steel slab surface clean.
3) it is rolling to enter the 4200mm four-high rougher after the de-scaling, and start rolling temperature is 1100 ℃, finishes the rolling of phase I more than the temperature at 1000 ℃, and steel billet thickness stops rolling when 54mm; Rapidly steel plate being sent to the 3500mm four high finishing mill then is rolled.
4) the finish rolling stage, finishing mill roll tonnage should be controlled at 2300t, and in this roll tonnage scope, roll shape relatively is fit to the rolling deformation unanimity of steel plate width direction, thereby guarantees that steel plate laterally shape wave can not occur; When rolling above this roll tonnage, understand at end three or last two passages appearance limit wave by a relatively large margin, cause the bent whole rolling pass of plate shape wooden dipper of steel plate to be controlled to be 7 passages, reduction ratio≤15% that extreme trace is inferior, finishing temperature is controlled at 844 ℃, is sent to straightener after steel plate rolling finishes at once and aligns, straightening temperature is controlled at 664 ℃, the aligning drafts is set to 2.0mm, and aligning speed is set to 0.8m/s, a time aligning; Steel plate behind the aligning should pass through the roller-plate cold bed fast, enters shear line, implements to cut edge and the scale operation.
The unevenness measured result of steel plate: see Table 1.
The unevenness of table 1 8mm steel plate
| The measuring position | Head 1m | Middle part 1m | Afterbody 1m |
| The unevenness value | ＜1mm/1m | ＜1mm/1m | ＜1mm/1m |
GB709-2006 requires as shown in table 2 to the unevenness of this specification steel plate.
Table 2 single steel plate unevenness
By table 1 and table 2 data as can be known: the unevenness everywhere of steel plate all satisfies the GB requirement.
The product that the inventive method is produced meets the standard of national steel-plate shape GB709-2006.
The pusher-type furnace that this method is selected for use, 4200mm four-high rougher, 3500mm four high finishing mill, straightener, the whole of roller-plate cold bed tear open certainly in the former used equipment of going up steel three factories.
Claims (1)
1. the production control method of a Q345B steel-plate shape is characterized in that: with processing thickness is that the steel plate of 8mm is an example;
Step 1 is selected the size of steel billet three-dimensional for use: high 220 mm * wide 1300 mm * long 1700mm;
Step 2 places pusher-type furnace to heat on steel billet, and temperature 1240-1280 ℃, insulation 38-43min, 1100-1200 ℃ of steel billet tapping temperature;
Step 3 steel billet is come out of the stove and is entered the rolling de-scaling of 4200mm four-high rougher, and 1100 ± 50 ℃ of start rolling temperatures at 1000-1200 ℃, are finished the rolling of phase I, and steel billet thickness stops rolling when 54mm; It is rolling that steel plate continues to enter the 3500mm four high finishing mill, finish rolling is controlled to be 7 passages, and wherein the inferior reduction ratio of extreme trace is≤15%, and finishing temperature is controlled at 800-860 ℃, steel plate rolling finishes, enter straightener and align, straightening temperature is controlled at 650-800 ℃, and the aligning drafts is 1.5-3mm, aligning speed is 0.8m/s, behind a time aligning, steel plate enters roller-plate cold bed, shear line, implements to cut edge and the scale operation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101174171A CN103212573A (en) | 2013-04-07 | 2013-04-07 | Production control method of Q345B steel plate shape |
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| CN2013101174171A CN103212573A (en) | 2013-04-07 | 2013-04-07 | Production control method of Q345B steel plate shape |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104550256A (en) * | 2014-12-17 | 2015-04-29 | 秦皇岛首秦金属材料有限公司 | TMCP (Thermal Mechanical Control Processing) thin gauge high-strength steel plate shape control method |
| CN109550782A (en) * | 2018-12-10 | 2019-04-02 | 北京首钢股份有限公司 | A kind of template process control method, roughing mill working roll and roughing mill |
| CN113210421A (en) * | 2021-05-19 | 2021-08-06 | 宝武集团鄂城钢铁有限公司 | Production method for controlling transverse plate shape of high-quality carbon structural steel plate based on single-frame wide and thick plate rolling line |
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| CN102296234A (en) * | 2011-09-07 | 2011-12-28 | 柳州钢铁股份有限公司 | Abrasion-resistant steel plate and production device and production method thereof |
| CN102719739A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Steel plate for low temperature of wind power tower and production method thereof |
| CN102766806A (en) * | 2012-07-11 | 2012-11-07 | 莱芜钢铁集团有限公司 | Ultrawide and ultrafine gauge structural steel plate for bridges and production method thereof |
| CN102825065A (en) * | 2012-09-13 | 2012-12-19 | 莱芜钢铁集团有限公司 | Rolling method for steel plates of wide and thin specifications |
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- 2013-04-07 CN CN2013101174171A patent/CN103212573A/en active Pending
Patent Citations (4)
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| CN102719739A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Steel plate for low temperature of wind power tower and production method thereof |
| CN102296234A (en) * | 2011-09-07 | 2011-12-28 | 柳州钢铁股份有限公司 | Abrasion-resistant steel plate and production device and production method thereof |
| CN102766806A (en) * | 2012-07-11 | 2012-11-07 | 莱芜钢铁集团有限公司 | Ultrawide and ultrafine gauge structural steel plate for bridges and production method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104550256A (en) * | 2014-12-17 | 2015-04-29 | 秦皇岛首秦金属材料有限公司 | TMCP (Thermal Mechanical Control Processing) thin gauge high-strength steel plate shape control method |
| CN109550782A (en) * | 2018-12-10 | 2019-04-02 | 北京首钢股份有限公司 | A kind of template process control method, roughing mill working roll and roughing mill |
| CN113210421A (en) * | 2021-05-19 | 2021-08-06 | 宝武集团鄂城钢铁有限公司 | Production method for controlling transverse plate shape of high-quality carbon structural steel plate based on single-frame wide and thick plate rolling line |
| CN113210421B (en) * | 2021-05-19 | 2022-07-12 | 宝武集团鄂城钢铁有限公司 | Production method for controlling transverse plate shape of high-quality carbon structural steel plate |
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Application publication date: 20130724 |