CN103586280B - Method for producing steel board with thickness of 5-8mm by utilization of heavy and medium plate mill - Google Patents
Method for producing steel board with thickness of 5-8mm by utilization of heavy and medium plate mill Download PDFInfo
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- CN103586280B CN103586280B CN201310547603.9A CN201310547603A CN103586280B CN 103586280 B CN103586280 B CN 103586280B CN 201310547603 A CN201310547603 A CN 201310547603A CN 103586280 B CN103586280 B CN 103586280B
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Abstract
A method for producing a steel board with the thickness of 5-8mm by the utilization of a heavy and medium plate mill comprises the steps that a casting blank with the thickness of 120-250mm is heated for the first time, rolled for the first time and split according to user requirements; the casting blank is heated and rolled for the second time, wherein the thickness is controlled to be 25-40mm; the casting blank is rolled in a fine mode; the steel board is meshed under the condition of 30-40 turns per minute and is rolled under the condition of 60-80 turns per minute, steel casting is carried out under the condition of 30-40 turns per minute, air blowing and cooling are carried out in the rolling process, and the steel board is straightened to be used. The method effectively overcomes the defects of edge waves, middle waves, deflection, steel overlapping and waste rolling occurring when the steel board with the thickness standard of 5-8mm is produced by the heavy and medium plate mill. The differences of the strength indexes of the head, the middle and the tail of the produced steel board are within the range of 5-20MPa; the degree of convexity of the steel board is low, the intra-plate difference is small, namely the degree of convexity of the steel board is smaller than or equal to 0.1mm, the intra-plate difference is smaller than or equal to 0.2mm, the intra-plate temperature uniformity is good, the unevenness degree of the steel board is small than three per thousand, no buckling phenomenon exists, the shape of the steel board is good, cost is low and the production process is simple.
Description
Technical field
The present invention relates to a kind of milling method of steel plate, belong to one heavy and medium plate mill particularly and produce the method that thickness is 5 ~ 8mm steel plate.
Background technology
For medium plate milling train, 5 ~ 8mm steel plate belongs to limit thin specification steel plate.Although the steel plate rolling specification of heavy and medium plate mill design is generally thick 6 ~ 200mm, wide 900 ~ 4100mm.But in actual production process, heavy and medium plate mill there will be limit wave, middle wave, sideslip, folded steel and rolls the problems such as useless when the steel plate of below rolling 8mm, and cause steel-plate shape poor, technique hit rate is low, performance inconsistency greatly and lack of homogeneity.Be limited by billet size in addition, 5 ~ 8mm steel plate can only take multiple length rolling mode, and cause steel plate very large with the plate temperature difference, performance is uneven, and plate shape is poor.The main cause producing the problems referred to above is, in Medium and Heavy Plate Rolling Ultra-thin steel plate process, temperature drop is fast, and steel plate deformed drag is increased, and equipment adaptive capacity is low, causes as-rolled condition extremely unstable.Therefore cut deal enterprise is generally difficult to the batch production carrying out this type of specification steel plate at present.
For a long time, 5 ~ 8mm thin specification steel plate adopts hot tandem to produce mostly, with coil of strip or opening plate delivery.But compare the steel plate that heavy and medium plate mill is produced, hot continuous rolling thin specification steel plate internal stress is large, and skewness.And the thin specification steel plate internal stress that heavy and medium plate mill is produced is less, distributing relatively uniform, is the ideal material of the field deep processings such as bridge, boats and ships, engineering machinery, is subject to the extensive favor of user just gradually.The regulation when ordering goods that market has many consumers can not adopt hot tandem to produce this type of Ultra-thin steel plate.But thin specification steel plate is the bottleneck of cut deal enterprise always, can produce Ultra-thin medium plate be one of key index of a measurement enterprise level, the market demand is also very large, as bridge, the deck of boat, special steel, pressure vessel etc., an Important Project contains a lot of specification, but often Ultra-thin steel plate cut deal produces line and is limited by capacity of equipment and steel-plate shape but can not be produced.Therefore, exploitation Ultra-thin steel plate manufacturing process technology, produces Ultra-thin steel plate, very great to the positive effect of cut deal enterprise.
Through retrieval, Chinese Patent Application No. is the patent document of 200710088015.8 and 201210523092.2, individually disclose a kind of 5mm steel plate rolling technique and a kind of 6mm steel plate rolling technique, what these two patent documents all adopted is one-heating forming technique, the sotck thinkness selected is comparatively large, and rolling pass is more.Its deficiency existed: temperature drop increases, is unfavorable for that steel-plate shape controls and temperature controls; Simultaneously because billet size is comparatively large, can only multiple length rolling, steel plate width is wide, and length is long, and temperature drop is fast, makes same plate temperature lack of homogeneity, and the temperature difference is large, easily causes that steel plate wooden dipper is bent and performance is uneven.
Chinese Patent Application No. be 20121089870.9 patent ask down, it discloses a kind of 2800mm Stand Mill heavy and medium plate mill Limit specifications steel plate rolling technique, one-heating forming technique is still adopted disclosed by the same document, the sotck thinkness selected is larger, rolling pass is more, temperature drop increases, be unfavorable for that plate shape and temperature control, simultaneously because billet size is comparatively large, multiple length rolling, steel plate width is wide, length is long, and temperature drop is fast, with plate temperature lack of homogeneity, the temperature difference is large, easily causes that steel plate wooden dipper is bent and performance is uneven.
Chinese Patent Application No. is the patent document of 201210189869.6, it discloses a kind of production technology of Stand Mill heavy and medium plate mill Thin Specs pipe line steel, this invention specify that it is the production technology of pipe line steel thin specification steel plate, and the steel plate thickness of actual production is at 8 ~ 10mm.Because its finish rolling finishing temperature is higher, if do not adopt laminar cooling system, steel plate crystal grain is comparatively thick, unfavorable to low-temperature flexibility.What adopt due to it equally is still the blank of large-size, and need multiple length rolling, there is temperature drop equally fast, with plate temperature lack of homogeneity, the temperature difference is large, easily causes the bent and unequal deficiency of performance of steel plate wooden dipper.
Summary of the invention
The limit wave, middle wave, the sideslip that occur when the present invention is directed to the production thin specification steel plate that prior art exists, fold steel and roll useless deficiency, there is provided a kind of by employing two pyrogene material technique, make steel plate not only high comprehensive performance, and strip crown and little with plate difference, good with plate temperature uniformity, what plate shape was good produces with heavy and medium plate mill the method that thickness is 5 ~ 8mm steel plate.
Realize the measure of above-mentioned purpose:
The method that thickness is 5 ~ 8mm steel plate produced by one heavy and medium plate mill, its step:
1) be that the strand of 120 ~ 250mm carries out first time heating by thickness, temperature controls be not less than 1160 DEG C;
2) carry out first time rolling, control its finishing temperature and be not less than 1000 DEG C, the THICKNESS CONTROL after rolling is at 60 ~ 80mm; And require to carry out cutting according to user;
3) carry out second time heating to strand, temperature controls be not less than 1260 DEG C;
4) carry out second time rolling, the finishing temperature controlling roughing is not less than 1050 DEG C, and rolling pass is in 2 ~ 4 passages, and THICKNESS CONTROL is at 25 ~ 40mm;
5) carry out finish rolling, control its start rolling temperature and be not less than 980 DEG C, finishing temperature is at 780 ~ 880 DEG C, and rolling pass is in 6 ~ 8 passages;
Finish rolling pattern is: steel plate is nipped under 30 ~ 40 revs/min, is rolled under 60 ~ 80 revs/min, under 30 ~ 40 revs/min, throw steel, in the process of rolling, blow cooling simultaneously; And it is stand-by after aligning.
It is characterized in that: blow at the forward and backward of milling train.
The effect of master operation in the present invention:
The present invention, owing to adopting two pyrogene material techniques, greatly can reduce and adopt the blank of Medium and Heavy Plate Rolling Production Ultra-thin steel plate thick
Degree, reduce billet size, reduce rolling pass, reduce temperature drop loss, improve temperature hit rate, coordinate and control (rhythm of production, operation cooperation up and down, working roll and backing roll Design of Crown, strong straight line configuration etc.) with perfect production process, can also manufacture order multiple length or many multiple lengths Ultra-thin steel plate, steel plate object performance is excellent, and plate shape is good, and (unevenness can reach less than 3 ‰, be significantly less than the regulation of GB/T 709), performance is even.
In the finish rolling stage, low speed is taked to nip+the velocity mode of fast speed rolling+throw at a slow speed steel.Namely when intermediate blank first time enters finishing mill, (the first passage) adopts the slow-speed of revolution of 30 ~ 40 revs/min to nip pattern, to avoid causing larger distortion; After completing the first passes, in order to reduce temperature drop, and reach the temperature controlling range of setting, therefore adopt the fast rotating speed rolling mode of 60 ~ 80 revs/min, steel is thrown in the slow-speed of revolution rolling rear employing 30 ~ 40 revs/min, produces heap steel to prevent longer, very thin steel plate or bores trench accident; Different rolling modes is converted, exactly in order to prevent the phenomenon of limit wave, camber, sideslip from producing in the operation of rolling; Before and after milling train, carry out air blowing purge simultaneously, uninterruptedly blow the cooling water of surface of steel plate off, to control the same plate temperature difference.
The present invention compared with prior art, efficiently solve with the limit wave occurred during heavy and medium plate mill production 5 ~ 8mm thickness specification steel plate, middle wave, sideslip, folded steel and roll useless deficiency, the steel plate high comprehensive performance produced, steel plate head, in, the intensity index at tail three place difference is within the scope of 5 ~ 20MPa; Strip crown and little with plate difference, i.e. strip crown≤0.1mm, with plate difference≤0.2mm, good with plate temperature uniformity, steel plate unevenness < 3 ‰, without wooden dipper Qu Xianxiang, plate shape is good, and with low cost, and production technology is simple.
Detailed description of the invention
Below the present invention is described in detail:
Embodiment 1
The method that thickness is 5mm steel plate produced by heavy and medium plate mill, its step:
1) be that the strand of 210mm carries out first time heating by thickness, it is 1160 DEG C that temperature controls;
2) carry out first time rolling, its finishing temperature is 1010 DEG C, and the THICKNESS CONTROL after rolling is at 60mm; And requiring to carry out cutting according to user, to become the wide and 2100mm of 1100mm long;
3) carry out second time heating to strand, it is 1260 DEG C that temperature controls;
4) carry out second time rolling, the finishing temperature of roughing is 1073 DEG C, and rolling pass is 3 passages, and thickness is 25mm;
5) carry out finish rolling, its start rolling temperature is 1000 DEG C, and finishing temperature is 780 DEG C, and rolling pass is 6 passages;
Finish rolling pattern is: steel plate is nipped under 31.57 revs/min, is rolled under 71.46 ~ 79.55 revs/min, at 30 turns
/ minute under throw steel, in the process of rolling, carry out blowing air simultaneously the cooling water of surface of steel plate dried up; And carry out just rectifying at steel billet temperature is 700 DEG C, aligning passage is 2 passages, and at 250 DEG C, carry out the brute force aligning of 2 passages; Stand-by.
After testing, mechanical property of steel plate is excellent, head, in, tail performance is even, with plate intensity difference at 18MPa, surface of steel plate unevenness is 2.55 ‰, is greatly better than similar steel plate level (< 12 ‰); Steel plate is 0.18mm with plate thickness difference, and strip crown is 0.095mm, and without wooden dipper Qu Xianxiang, plate shape is good.
Embodiment 2
The method that thickness is 6mm steel plate produced by heavy and medium plate mill, its step:
1) be that the strand of 210mm carries out first time heating by thickness, it is 1210 DEG C that temperature controls;
2) carry out first time rolling, its finishing temperature is 1025 DEG C, and the THICKNESS CONTROL after rolling is at 65mm; And requiring to carry out cutting according to user, to become the wide and 2200mm of 1200mm long;
3) carry out second time heating to strand, it is 1270 DEG C that temperature controls;
4) carry out second time rolling, the finishing temperature of roughing is 1090 DEG C, and rolling pass is 3 passages, and thickness is 28mm;
5) carry out finish rolling, its start rolling temperature is 1015 DEG C, and finishing temperature is 790 DEG C, and rolling pass is 7 passages;
Finish rolling pattern is: steel plate is nipped under 33.5 revs/min, is rolled under 77.13 ~ 79.9 revs/min, 35 turns/
Throw steel under minute, the head simultaneously at milling train in the process of rolling, tail place carry out blowing air, are dried up by the cooling water of surface of steel plate; And carry out just rectifying at steel billet temperature is 695 DEG C, aligning passage is 4 passages, and at 220 DEG C, carry out the brute force aligning of 2 passages; Stand-by.
After testing, mechanical property of steel plate is excellent, head, in, tail performance is even, with plate intensity difference at 15MPa, surface of steel plate unevenness is 2.8 ‰, is greatly better than similar steel plate level; Steel plate is 0.16mm with plate thickness difference, and strip crown is 0.098mm, and without wooden dipper Qu Xianxiang, plate shape is good.
Embodiment 3
The method that thickness is 8mm steel plate produced by heavy and medium plate mill, its step:
1) be that the strand of 250mm carries out first time heating by thickness, it is 1205 DEG C that temperature controls;
2) carry out first time rolling, its finishing temperature is 1015 DEG C, and the THICKNESS CONTROL after rolling is at 80mm; And requiring to carry out cutting according to user, to become the wide and 2500mm of 1500mm long;
3) carry out second time heating to strand, it is 1285 DEG C that temperature controls;
4) carry out second time rolling, the finishing temperature of roughing is 1085 DEG C, and rolling pass is 2 passages, and thickness is 48mm;
5) carry out finish rolling, its start rolling temperature is 1010 DEG C, and finishing temperature is 820 DEG C, and rolling pass is 8 passages;
Finish rolling pattern is: steel plate is nipped under 30.87 revs/min, is rolled, 30 under 60.53 ~ 69.16 revs/min
Throw steel under rev/min, the head simultaneously at milling train in the process of rolling, tail place carry out blowing air, are dried up by the cooling water of surface of steel plate; And carry out just rectifying at steel billet temperature is 635 DEG C, aligning passage is 2 passages, and at 205 DEG C, carry out the brute force aligning of 2 passages; Stand-by.
After testing, mechanical property of steel plate is excellent, head, in, tail performance is even, with plate intensity difference at 12MPa, surface of steel plate unevenness is 2.6 ‰, is greatly better than similar steel plate level; Steel plate is 0.17mm with plate thickness difference, and strip crown is 0.09mm, and without wooden dipper Qu Xianxiang, plate shape is good.
Embodiment 4
The method that thickness is 7.5mm steel plate produced by heavy and medium plate mill, its step:
1) be that the strand of 230mm carries out first time heating by thickness, it is 1175 DEG C that temperature controls;
2) carry out first time rolling, its finishing temperature is 1023 DEG C, and the THICKNESS CONTROL after rolling is at 75mm; And requiring to carry out cutting according to user, to become the wide and 2400mm of 1350mm long;
3) carry out second time heating to strand, it is 1270 DEG C that temperature controls;
4) carry out second time rolling, the finishing temperature of roughing is 1072 DEG C, and rolling pass is 2 passages, and thickness is 45mm;
5) carry out finish rolling, its start rolling temperature is 1005 DEG C, and finishing temperature is 805 DEG C, and rolling pass is 8 passages;
Finish rolling pattern is: steel plate is nipped under 37.5 revs/min, is rolled under 72.1 ~ 76.35 revs/min, 30 turns/
Throw steel under minute, the head simultaneously at milling train in the process of rolling, tail place carry out blowing air, are dried up by the cooling water of surface of steel plate; And carry out just rectifying at steel billet temperature is 625 DEG C, aligning passage is 2 passages, and at 210 DEG C, carry out the brute force aligning of 3 passages; Stand-by.
After testing, mechanical property of steel plate is excellent, head, in, tail performance is even, with plate intensity difference at 10MPa, surface of steel plate unevenness is 2.0 ‰, is greatly better than similar steel plate level; Steel plate is 0.10mm with plate thickness difference, and strip crown is 0.089mm, and without wooden dipper Qu Xianxiang, plate shape is good.
Embodiment 5
The method that thickness is 6.5mm steel plate produced by heavy and medium plate mill, its step:
1) be that the strand of 125mm carries out first time heating by thickness, it is 1180 DEG C that temperature controls;
2) carry out first time rolling, its finishing temperature is 1009 DEG C, and the THICKNESS CONTROL after rolling is at 65mm; And requiring to carry out cutting according to user, to become the wide and 2100mm of 1200mm long;
3) carry out second time heating to strand, it is 1278 DEG C that temperature controls;
4) carry out second time rolling, the finishing temperature of roughing is 1069 DEG C, and rolling pass is 2 passages, and thickness is 25mm;
5) carry out finish rolling, its start rolling temperature is 995 DEG C, and finishing temperature is 790 DEG C, and rolling pass is 6 passages;
Finish rolling pattern is: steel plate is nipped under 39.5 revs/min, is rolled under 65.6 ~ 69. 5 revs/min, 38 turns/
Throw steel under minute, the head simultaneously at milling train in the process of rolling, tail place carry out blowing air, are dried up by the cooling water of surface of steel plate; And carry out just rectifying at steel billet temperature is 615 DEG C, aligning passage is 2 passages, and at 200 DEG C, carry out the brute force aligning of 2 passages; Stand-by.
After testing, mechanical property of steel plate is excellent, head, in, tail performance is even, with plate intensity difference at 16MPa, surface of steel plate unevenness is 2.1 ‰, is greatly better than similar steel plate level; Steel plate is 0.093mm with plate thickness difference, and strip crown is 0.091mm, and without wooden dipper Qu Xianxiang, plate shape is good.
Above-described embodiment is only the best and exemplifies, and is not the restriction to embodiments of the present invention.
Claims (2)
1. produce the method that thickness is 5 ~ 8mm steel plate, its step with heavy and medium plate mill:
1) be that the strand of 120 ~ 250mm carries out first time heating by thickness, temperature controls be not less than 1160 DEG C;
2) carry out first time rolling, control its finishing temperature and be not less than 1000 DEG C, the THICKNESS CONTROL after rolling is at 60 ~ 80mm; And require to carry out cutting according to user;
3) carry out second time heating to strand, temperature controls be not less than 1260 DEG C;
4) carry out second time rolling, the finishing temperature controlling roughing is not less than 1050 DEG C, and rolling pass is in 2 ~ 4 passages, and THICKNESS CONTROL is at 25 ~ 40mm;
5) carry out finish rolling, control its start rolling temperature and be not less than 980 DEG C, finishing temperature is at 780 ~ 880 DEG C, and rolling pass is in 6 ~ 8 passages;
Finish rolling pattern is: steel plate is nipped under 30 ~ 40 revs/min, is rolled under 60 ~ 80 revs/min, under 30 ~ 40 revs/min, throw steel, carries out the cooling water of blowing surface of steel plate simultaneously and dried up in the process of rolling; And it is stand-by after aligning.
2. the method that thickness is 5 ~ 8mm steel plate produced by one heavy and medium plate mill as claimed in claim 1, it is characterized in that: blow at the forward and backward of milling train.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310547603.9A CN103586280B (en) | 2013-11-08 | 2013-11-08 | Method for producing steel board with thickness of 5-8mm by utilization of heavy and medium plate mill |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310547603.9A CN103586280B (en) | 2013-11-08 | 2013-11-08 | Method for producing steel board with thickness of 5-8mm by utilization of heavy and medium plate mill |
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| Publication Number | Publication Date |
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| CN103586280A CN103586280A (en) | 2014-02-19 |
| CN103586280B true CN103586280B (en) | 2015-07-01 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105665443B (en) * | 2016-03-30 | 2018-01-23 | 首钢总公司 | A kind of rolling mill practice of wide and heavy plate mill production Limit specifications pipe line steel |
| CN105855315A (en) * | 2016-04-05 | 2016-08-17 | 重庆钢铁(集团)有限责任公司 | Production method for steel plate |
| CN112359191B (en) * | 2020-11-10 | 2022-04-19 | 江苏省沙钢钢铁研究院有限公司 | TMCP type bridge steel plate with small same-plate strength difference and production method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101920278A (en) * | 2009-06-17 | 2010-12-22 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of production method of hot-rolled steel plate for automobile |
| CN102671941A (en) * | 2012-06-11 | 2012-09-19 | 南京钢铁股份有限公司 | Process for producing thin gauge pipeline steel by using double-stand medium and heavy plate mill |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10038292A1 (en) * | 2000-08-05 | 2002-02-14 | Sms Demag Ag | Production of continuously cast slabs comprises using a device having a blooming train, a roller table, a roller table section, a leveling unit, an inductive heating device, a finishing train, a delivery roller table and coiling machines |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101920278A (en) * | 2009-06-17 | 2010-12-22 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of production method of hot-rolled steel plate for automobile |
| CN102671941A (en) * | 2012-06-11 | 2012-09-19 | 南京钢铁股份有限公司 | Process for producing thin gauge pipeline steel by using double-stand medium and heavy plate mill |
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