CN102671941B - Process for producing thin gauge pipeline steel by using double-stand medium and heavy plate mill - Google Patents

Process for producing thin gauge pipeline steel by using double-stand medium and heavy plate mill Download PDF

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CN102671941B
CN102671941B CN201210189869.6A CN201210189869A CN102671941B CN 102671941 B CN102671941 B CN 102671941B CN 201210189869 A CN201210189869 A CN 201210189869A CN 102671941 B CN102671941 B CN 102671941B
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rolled piece
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CN102671941A (en
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郑东升
朱金宝
侯中华
廖仕军
牛继龙
员强鹏
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Nanjing Iron and Steel Co Ltd
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Abstract

The invention discloses a process for producing thin gauge pipeline steel by using a double-stand medium and heavy plate mill. A plate blank with the thickness of 180 mm is used for producing the thin gauge pipeline steel with the thickness less than 10 mm. On the basis that the performance of a rolled piece meets requirements, the thin gauge pipeline steel with a good plate shape can be obtained by controlling the tapping temperature of the plate blank, the rough rolling broadening pass pressing rate, the longitudinal rolling pass pressing rate after rough rolling broadening pass, the rough rolling finishing temperature, the thickness of a middle blank, the finish rolling ending pass pressing rate, the finish rolling finishing temperature, the roller gap inclination and sled function in the rolling process, a high pressure water descaling system, the water entry temperature, the re-reddening temperature, and the head and tail shielding and straightening process of a laminar cooling system. The deformation rate is reduced, and the economic benefit is increased.

Description

The production technology of the thin specification pipe line steel of a kind of Stand Mill heavy and medium plate mill
Technical field
The invention belongs to steel rolling field, relate to a kind of production technology of pipe line steel, specifically the production technology of the thin specification pipe line steel of a kind of Stand Mill heavy and medium plate mill.
Background technology
While being less than the thin specification pipe line steel of 10mm with the thick slab production thickness of 180mm on 2800mm Stand Mill heavy and medium plate mill, in view of the location arrangements of each equipment on production line and the consideration of product lumber recovery, blank designs by double chi or the triple scale of order steel plate, and its length is no more than 2.5m.Rolled piece is constantly attenuation, elongated in the operation of rolling of two-stand mills, and temperature drop is also more and more faster, especially end to end part.Non-uniform temperature in length of rolled piece direction cause rolled piece performance inconsistency and milled sheet shape wayward, add rolled piece head and tail temperature low, workpiece front end milling train or the afterbody roll-force while leaving milling train of nipping sharply increases, and has increased mill load.Existing production technology can not meet the production requirement of thin specification pipe line steel.
Summary of the invention
In order to overcome the problem in existing thin specification pipe line steel production, the production technology that the object of this invention is to provide the thin specification pipe line steel of a kind of Stand Mill heavy and medium plate mill, during the thin specification pipe line steel of this explained hereafter, avoided that rolled piece stall, plate shape are good, stable performance, on the basis that can meet the demands in rolled piece performance, obtain the thin specification pipe line steel that plate shape is good, reduce wooden dipper curvature, improved economic benefit.
The object of the invention is to be achieved through the following technical solutions:
The production technology of the thin specification pipe line steel of a kind of Stand Mill heavy and medium plate mill, it is characterized in that: the slab that this technique is 180mm with thickness is produced the thin specification pipe line steel that thickness is less than 10mm, by controlling slab tapping temperature, roughing broadening percentage pass reduction, axial rolling percentage pass reduction after roughing broadening passage, roughing finishing temperature, workpiece thickness, finish rolling end percentage pass reduction, finish rolling finishing temperature, roll gap in the operation of rolling tilts and sled function, high-pressure water descaling system, enter coolant-temperature gage, red temperature, covering end to end of layer cooling system, straightening process, on the basis that can meet the demands in rolled piece performance, obtain the thin specification pipe line steel that plate shape is good, reduced wooden dipper curvature, improved economic benefit.This technique comprises the following steps:
1) slab is 1140~1180 ℃ in the temperature of heating furnace heating leading portion, and the temperature of heating back segment is 1210~1250 ℃, and soaking zone temperature is 1190~1230 ℃, soaking time 30min, 1190~1210 ℃ of tapping temperatures; Burner pressure 27~33Pa, improves board briquette uniformity, prevents burner negative and positive steel, prevents that the steel billet that contains male and female face from appearring in burner;
2) slab come out of the stove after through the thick de-scaling of De-scaling box, water under high pressure pressure is greater than 19MPa, then carries out two stage rolling, roughing finishing temperature is 1040~1060 ℃, finish rolling finishing temperature is 870~890 ℃;
3) total rolling pass is 12 passages, workpiece thickness≤4h, and h is finished product thickness, roughing broadening percentage pass reduction < 21%, broadening requires axial rolling percentage pass reduction≤32.3% after width to finished product, finish rolling end percentage pass reduction≤16%;
4) rough rolling step the first passage, the 3rd passage, the 7th passage high-pressure water descaling, the first sub-high pressure water de-scaling of finish rolling stage, removes secondary oxidation iron sheet and three iron scales on rolled piece surface; Rough rolling step the first passage, the 3rd logical plate high-pressure water descaling in passage rolled piece surface, the high-pressure water descaling of rough rolling step the 7th passage, finish rolling stage first passage depending on rolled piece end to end with middle temperature difference situation to dodging end to end, rolled piece is approached with mid portion temperature end to end, guarantee that in length of rolled piece direction, temperature is even;
5) after roughing finishes, intermediate blank enters finishing mill by delay table fast with the speed of 6m/s, and for the technological requirement that reduces the temperature drop of rolled piece in the operation of rolling and meet finish rolling finishing temperature, finish rolling mill speed is 2.68~4m/s;
6) sled that comes into operation in rough rolling process is controlled function, according to the warpage degree of workpiece front end, adjust, if rolled piece is kowtowed, sled is controlled as+10%~+ 100%, bottom working roll rotating speed > top working roll rotating speed, makes the extension of rolled piece lower surface be greater than upper surface; If rolled piece end bending, sled is controlled as-10%~-100%, and top working roll rotating speed > bottom working roll rotating speed, makes the extension of rolled piece upper surface be greater than lower surface;
7) finish rolling stage dynamic adjustments roll gap tilting value, makes the poor 300KN of being less than of roll-force of transmission side and fore side, reduces the generation of camber; According to limit wave and the middle unrestrained situation of plate shape, fine setting reduction in pass, makes rolled piece straight, if plate shape is limit wave, suitably reduces reduction in pass; If plate shape is middle wave, suitably increase reduction in pass;
8) after finish rolling finishes, with the speed of 4m/s, throw fast steel, reduce the temperature drop of rolled piece, guarantee that rolled piece enters coolant-temperature gage between 760~810 ℃; Rolled piece enters after layer cooling system, the shielding function end to end that comes into operation, reduce rolled piece end to end with the middle temperature difference, guarantee the uniformity of red temperature in length of rolled piece direction; The side-spraying device of layer cooling system falls clearly the residual water that leading portion collector on rolled piece surface has temperature rise, realizes cooling to rolled piece of the new water of back segment collector, avoids surface cool inequality to cause that rolled piece plate shape wooden dipper is bent;
9) rolled piece goes out after layer cooling system, approaching straightener position, by heading machine, its head is flattened, and reduces its collision to smoothing roll; The setting of straightener roll gap guarantees that on rolled piece thickness direction, the plastic deformation degree of depth reaches the more than 80% of full profile height; According to rolled piece warpage degree end to end, dynamically adjust flattener edge roll height, make rolled piece straight, obtain the thin specification pipe line steel that thickness is less than 10mm.
The present invention increases roughing previous three passes drafts, reduces the drafts of passage and each passage of finish rolling after roughing, guarantees harden austenitic Strain Accumulation and the good rolled piece plate shape of the whole operation of rolling of the austenitic dynamic recrystallization of rough rolling step, finish rolling stage.Roughing adopts rolls mode in length and breadth, has improved the lateral performance of rolled piece, has reduced the anisotropy of rolled piece.
When the present invention has overcome slab that 180mm is thick and produces thickness and be less than the thin specification pipe line steel of 10mm temperature drop soon, warpage, shortcoming that plate shape is poor end to end, by improving burner pressure, tapping temperature, optimize the rolling schedule of roughing, finish rolling, accelerate rolling rhythm, choose reasonable high-pressure water descaling passage and de-scaling position, the operation of rolling adopts sled control, dynamic roll gap tilt function, the cold process of layer comes into operation and covers end to end, on aligning process rolled piece thickness direction, reach more than 80% plastic deformation ratio, realize Stand Mill heavy and medium plate mill and produce thin specification pipe line steel.
The present invention has successfully solved performance and the plate shape problem of the thin specification pipe line steel of Stand Mill heavy and medium plate mill, has improved properties percent of pass, has reduced plate shape wooden dipper curvature, and has improved economic benefit.The present invention is applicable to the thick slab of 180mm and produces the thin specification pipe line steel that thickness is less than 10mm, has avoided that rolled piece stall, plate shape are good, stable performance, is guaranteeing on the basis that properties of product meet the demands, to obtain good steel-plate shape.
Accompanying drawing explanation
Fig. 1 is the layout schematic diagram of Stand Mill heavy and medium plate mill in the present invention, in figure, and 1-heating furnace, 2-De-scaling box, the reversible roughing mill of 3-2800mm, tetra-roller, 4-delay table, 5-2690mm, tetra-roller reversing finishing mills, 6-laminar cooling system, 7-straightener.
The specific embodiment
Embodiment 1
The control technique of the thin specification Pipeline Steel Properties of a kind of Stand Mill heavy and medium plate mill and plate shape, 1190~1210 ℃ of this technological requirement tapping temperatures, rolling pass is 12 passages, roughing finishing temperature >=1040 ℃, workpiece thickness 3.9h, 845~885 ℃ of finish rolling finishing temperatures; Roughing broadening percentage pass reduction < 21%, broadening requires axial rolling percentage pass reduction≤20.35% after width to finished product, finish rolling end percentage pass reduction < 15%; The sled that comes into operation in rough rolling process is controlled function, reduces the warpage degree of workpiece front end, and dynamic adjustments roll gap tilting value in finishing stands improves the plate shape of rolled piece body; Speed with 4m/s after finish rolling finish to gauge is thrown steel fast, and it is 760~800 ℃ that rolled piece enters coolant-temperature gage, enters after layer cooling system, adopt cover end to end reduce rolled piece end to end with the temperature difference of mid portion, laminar cooling water water is than 1.6; The setting of straightener roll gap guarantees that on rolled piece thickness direction, plastic deformation ratio reaches more than 80%, aligning speed 1m/s.
The present embodiment is selected 1 X70 pipe line steel, blank actual size 180mm*2060mm*1282mm, and finished product thickness 8.22mm, is total to rolling 12 passages, roughing 7 passages, finish rolling 5 passages.Detailed process is as follows:
1) slab is 1140~1180 ℃ in the temperature of heating furnace 1 heating leading portion, and the temperature of heating back segment is 1210~1250 ℃, and soaking zone temperature is 1190~1230 ℃, soaking time 30min, 1200 ℃ of tapping temperatures.Burner pressure 27~33Pa, improves board briquette uniformity, prevents burner negative and positive steel, prevents that the steel billet that contains male and female face from appearring in burner.Slab come out of the stove after through the thick de-scaling of De-scaling box 2, remove the once oxidation iron sheet of steel slab surface, water under high pressure pressure is greater than 19MPa.
2) enter reversible roughing mill 3 roughing of 2800mm tetra-roller, previous three passes is broadening passage, percentage pass reduction is respectively 14.82%, 16.87%, 20.35%, then carry out axial rolling, corresponding percentage pass reduction is respectively 24.1%, 26.25%, 26.5%, 23.49%, and roughing finishing temperature is 1043~1054 ℃.The sled that comes into operation in rough rolling process is controlled function, and according to the warpage degree of workpiece front end, sled is controlled as-100%~+ 100%.Rough rolling step first, the 3rd passage, rolled piece leads to plate high-pressure water descaling, the high-pressure water descaling of the 7th passage depending on rolled piece end to end with middle temperature difference situation to dodging end to end.
3), after roughing finishes, rolled piece, carries out in the process of smart de-scaling before 2690mm tetra-roller reversing finishing mill 5 machines fast by delay table 4 with the speed of 6m/s, depending on rolled piece end to end with middle temperature difference situation to dodging end to end, and carry out finish rolling.The finish rolling stage, each reduction in pass reduced gradually, and last reduction in pass is 1.39mm, and last percentage pass reduction is 14.46%, and finish rolling finishing temperature is 870~880 ℃.In the finish rolling stage, dynamic adjustments roll gap tilting value is finely tuned 0.02mm at every turn, makes the poor 300KN of being less than of roll-force of transmission side and fore side.
4) after finish rolling finishes, rolled piece is thrown steel fast with the speed of 4m/s, and it is 763~794 ℃ that rolled piece enters coolant-temperature gage, enters after layer cooling system 6, the shielding function end to end that comes into operation, roller table speed 1.4m/s, roll table accelerating 0.003m/s 2, laminar cooling water water is than 1.6.In the cold process of rolled piece layer, open side spray apparatus falls clearly the residual water that leading portion collector has temperature rise, realizes cooling to rolled piece of the new water of back segment collector, and the plate shape wooden dipper of avoiding surface of steel plate inhomogeneous cooling to cause is bent.Red temperature after rolled piece layer is cold is 550~570 ℃.
5) heading machine of straightener 7 porch flattens the head of rolled piece, eliminates the warpage of workpiece front end, then enters straightener.Straightener inlet roll gap is 1.3mm, and outlet roll gap is 4.7mm, entrance, be respectively-2mm of Exit-edge roller height ,-0.5mm, and aligning speed is 1m/s, straightening force 2040t.Obtain the thin specification pipe line steel of thickness 8.22mm.
Embodiment 2
The control technique of the thin specification Pipeline Steel Properties of a kind of Stand Mill heavy and medium plate mill and plate shape, 1190~1210 ℃ of this technological requirement tapping temperatures, rolling pass is 12 passages, roughing finishing temperature >=1040 ℃, workpiece thickness 3.6h (h is finished product thickness), 870~890 ℃ of finish rolling finishing temperatures; Roughing broadening percentage pass reduction < 10%, broadening requires axial rolling percentage pass reduction≤26.97% after width to finished product, finish rolling end percentage pass reduction < 15%; The sled that comes into operation in rough rolling process is controlled function, and dynamic adjustments roll gap tilting value in finishing stands reduces the warpage degree of workpiece front end, has improved the plate shape of rolled piece body; Speed with 4m/s after finish rolling finish to gauge is thrown steel fast, and it is 770~810 ℃ that rolled piece enters coolant-temperature gage, enters after layer cooling system, adopt cover end to end reduce rolled piece end to end with the temperature difference of mid portion, laminar cooling water water is than 1.6; The setting of straightener roll gap guarantees that on rolled piece thickness direction, plastic deformation ratio reaches more than 80%, aligning speed 1m/s.
The present embodiment is selected 1 X70W pipe line steel, blank actual size 180mm*2060mm*2268mm, and finished product thickness 9.86mm, is total to rolling 12 passages, roughing 7 passages, finish rolling 5 passages.Detailed process is as follows:
1) slab is 1140~1180 ℃ in the temperature of heating furnace 1 heating leading portion, and the temperature of heating back segment is 1210~1250 ℃, and soaking zone temperature is 1190~1230 ℃, soaking time 30min, 1200 ℃ of tapping temperatures.Burner pressure 27~33Pa, improves board briquette uniformity, prevents burner negative and positive steel, prevents that the steel billet that contains male and female face from appearring in burner.Slab come out of the stove after through the thick de-scaling of De-scaling box 2, remove the once oxidation iron sheet of steel slab surface, water under high pressure pressure is greater than 19MPa.
2) enter reversible roughing mill 3 roughing of 2800mm tetra-roller, the first passage is broadening passage, percentage pass reduction is 8.37%, then carry out axial rolling, corresponding percentage pass reduction is respectively 15.65%, 18.8%, 22.46%, 26.97%, 26.45%, 24.85%, and roughing finishing temperature is 1045~1056 ℃.The sled that comes into operation in rough rolling process is controlled function, and according to the warpage degree of workpiece front end, sled is controlled as-100%~+ 100%.Rough rolling step first, the 3rd passage, rolled piece leads to plate high-pressure water descaling, the high-pressure water descaling of the 7th passage depending on rolled piece end to end with middle temperature difference situation to dodging end to end.
3), after roughing finishes, rolled piece, carries out in the process of smart de-scaling before 2690mm tetra-roller reversing finishing mill 5 machines fast by delay table 4 with the speed of 6m/s, depending on rolled piece end to end with middle temperature difference situation to dodging end to end, and carry out finish rolling.The finish rolling stage, each reduction in pass reduced gradually, and last reduction in pass is 1.7mm, and last percentage pass reduction is 14.7%, and finish rolling finishing temperature is 875~890 ℃.In the finish rolling stage, dynamic adjustments roll gap tilting value is finely tuned 0.02mm at every turn, makes the poor 300KN of being less than of roll-force of transmission side and fore side.
4) after finish rolling finishes, rolled piece is thrown steel fast with the speed of 4m/s, and it is 776~805 ℃ that rolled piece enters coolant-temperature gage, enters after layer cooling system 6, the shielding function end to end that comes into operation, roller table speed 1.4m/s, roll table accelerating 0.003m/s 2, laminar cooling water water is than 1.6.In the cold process of rolled piece layer, open side spray apparatus falls clearly the residual water that leading portion collector has temperature rise, realizes cooling to rolled piece of the new water of back segment collector, and the plate shape wooden dipper of avoiding surface of steel plate inhomogeneous cooling to cause is bent.Red temperature after rolled piece layer is cold is 536~560 ℃.
5) heading machine of straightener 7 porch flattens the head of rolled piece, eliminates the warpage of workpiece front end, then enters straightener.Straightener inlet roll gap is 2.8mm, and outlet roll gap is 6.8mm, entrance, be respectively-2mm of Exit-edge roller height ,-0.5mm, and aligning speed is 1m/s, straightening force 2073t.

Claims (3)

1. the production technology of the thin specification pipe line steel of Stand Mill heavy and medium plate mill, it is characterized in that: the slab that this technique is 180mm with thickness is produced the thin specification pipe line steel that thickness is less than 10mm, by controlling slab tapping temperature, roughing broadening percentage pass reduction, axial rolling percentage pass reduction after roughing broadening passage, roughing finishing temperature, workpiece thickness, finish rolling end percentage pass reduction, finish rolling finishing temperature, roll gap in the operation of rolling tilts and sled function, high-pressure water descaling system, enter coolant-temperature gage, red temperature, covering end to end of layer cooling system, straightening process, on the basis meeting the demands in rolled piece performance, obtain the thin specification pipe line steel that plate shape is good, comprise the following steps:
1) slab is 1140~1180 ℃ in the temperature of heating furnace heating leading portion, and the temperature of heating back segment is 1210~1250 ℃, and soaking zone temperature is 1190~1230 ℃, soaking time 30min, 1190~1210 ℃ of tapping temperatures; Burner pressure 27~33Pa;
2) slab come out of the stove after through the thick de-scaling of De-scaling box, water under high pressure pressure is greater than 19MPa, then carries out two stage rolling, roughing finishing temperature is 1040~1060 ℃, finish rolling finishing temperature is 870~890 ℃;
3) total rolling pass is 12 passages, workpiece thickness≤4h, and h is finished product thickness, roughing broadening percentage pass reduction < 21%, broadening requires axial rolling percentage pass reduction≤32.3% after width to finished product, finish rolling end percentage pass reduction≤16%;
4) rough rolling step the first passage, the 3rd passage, the 7th passage high-pressure water descaling, the first sub-high pressure water de-scaling of finish rolling stage, removes secondary oxidation iron sheet and three iron scales on rolled piece surface;
5) after roughing finishes, intermediate blank enters finishing mill by delay table fast, and for the technological requirement that reduces the temperature drop of rolled piece in the operation of rolling and meet finish rolling finishing temperature, finish rolling mill speed is 2.68~4m/s;
6) sled that comes into operation in rough rolling process is controlled function, according to the warpage degree of workpiece front end, adjust, if rolled piece is kowtowed, sled is controlled as+10%~+ 100%, bottom working roll rotating speed > top working roll rotating speed, makes the extension of rolled piece lower surface be greater than upper surface; If rolled piece end bending, sled is controlled as-10%~-100%, and top working roll rotating speed > bottom working roll rotating speed, makes the extension of rolled piece upper surface be greater than lower surface;
7) finish rolling stage dynamic adjustments roll gap tilting value, makes the poor 300KN of being less than of roll-force of transmission side and fore side, reduces the generation of camber; According to limit wave and the middle unrestrained situation of plate shape, fine setting reduction in pass, makes rolled piece straight, if plate shape is limit wave, suitably reduces reduction in pass; If plate shape is middle wave, suitably increase reduction in pass;
8) after finish rolling finishes, throw fast steel, reduce the temperature drop of rolled piece, guarantee that rolled piece enters coolant-temperature gage between 760~810 ℃, enters a layer cooling system;
9) rolled piece goes out after layer cooling system, approaching straightener position, by heading machine, its head is flattened, and reduces its collision to smoothing roll; The setting of straightener roll gap guarantees that on rolled piece thickness direction, the plastic deformation degree of depth reaches the more than 80% of full profile height; According to rolled piece warpage degree end to end, dynamically adjust flattener edge roll height, make rolled piece straight, obtain the thin specification pipe line steel that thickness is less than 10mm.
2. the production technology of the thin specification pipe line steel of Stand Mill heavy and medium plate mill according to claim 1, it is characterized in that: in step 4), rough rolling step the first passage, the 3rd logical plate high-pressure water descaling in passage rolled piece surface, the high-pressure water descaling of rough rolling step the 7th passage, finish rolling stage first passage depending on rolled piece end to end with middle temperature difference situation to dodging end to end, rolled piece is approached with mid portion temperature end to end, guarantee that in length of rolled piece direction, temperature is even.
3. the production technology of the thin specification pipe line steel of Stand Mill heavy and medium plate mill according to claim 1, it is characterized in that: in step 8), rolled piece enters after layer cooling system, shielding function end to end comes into operation, reduce rolled piece end to end with the middle temperature difference, guarantee the uniformity of red temperature in length of rolled piece direction; The side-spraying device of layer cooling system falls clearly the residual water that leading portion collector on rolled piece surface has temperature rise, realizes cooling to rolled piece of the new water of back segment collector, avoids surface cool inequality to cause that rolled piece plate shape wooden dipper is bent.
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