CN102806233A - Controlled rolling and controlled cooling process for manufacturing double-phase steel by single-shelf steckel mill - Google Patents
Controlled rolling and controlled cooling process for manufacturing double-phase steel by single-shelf steckel mill Download PDFInfo
- Publication number
- CN102806233A CN102806233A CN2012102883518A CN201210288351A CN102806233A CN 102806233 A CN102806233 A CN 102806233A CN 2012102883518 A CN2012102883518 A CN 2012102883518A CN 201210288351 A CN201210288351 A CN 201210288351A CN 102806233 A CN102806233 A CN 102806233A
- Authority
- CN
- China
- Prior art keywords
- rolling
- rolled piece
- temperature
- passage
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention provides a controlled rolling and controlled cooling process for manufacturing a double-phase steel by a single-shelf steckel mill. A novel rolling mode of a 3500 mm single-frame steckel mill with four rough rolling passes, seven fine rolling passes and two delaying passes is developed, a novel rolling mode of the steckel mill with four rough rolling passes, six fine rolling passes and one delaying pass is developed, a high pressure small-flow descaling process with a first fine rolling pass and a delaying pass is developed, a function of logically controlling delaying pass speed by a one-level program is developed, a function of automatically controlling temperature after fine rolling of the steckel mill is finished is developed, a function of automatically throwing steel after fine rolling of the steckel mill is finished is developed, a function of constantly increasing speed of the steckel mill in any length of a rolled piece is developed and so on; therefore, a new problem in the hot rolling high-end special quality product production process of the single-frame steckel mill is solved, manual steel throwing is carried out seconds after manpower is replaced with automatic temperature control and steel throwing when fine rolling is finished, temperature uniformity of the rolled piece during entering water is improved, qualified rate of the performance is increased and surface quality of a steel plate is improved.
Description
Technical field
The present invention relates to a kind of control technology of steekle mill, a kind of specifically single chassis steekle mill is produced the cooling controlling and rolling controlling process of dual phase steel.
Background technology
The blank that present used thickness is 150mm is put down when rolling high-end special duplex structure steel; Plate property need satisfy the specific (special) requirements of stress ratio and yield tensile ratio; For guaranteeing that microstructure and property all meets the demands, technology to time of staying temperature, go into coolant-temperature gage, return red temperature extremely strictness requirement is accurately all arranged.
Tissue is required to compare, yield tensile ratio is had for double structure, counter stress the steel grade of specific (special) requirements; After requiring the finish rolling stage to finish; Can not directly get into laminar flow cooling, but want temperature automatically controlled before the machine of getting back to behind the slave, treat temperature control time according with process requirements after; Obtain a certain proportion of pro-eutectoid ferrite earlier, milling train is thrown automatically in the cooling of steel entering laminar flow and is obtained bainite or martensite afterwards.This just requires the rolling or even passage of the strange passage of steekle mill rolling, treats temperature before all must being back to machine after finish rolling finishes, simultaneously according to technology to going into the needs of coolant-temperature gage; One-level logical program instead secondary rules are controlled the speed of treating warm passage; Guarantee before the machine that can be back on request after steel plate finish rolling finishes temperature automatically controlledly, treat that temperature control finishes the back and throws steel automatically, the steel plate head temperature will be higher than the afterbody temperature during simultaneously to the rolled piece entry; Milling train will possess the function that reduces the rolled piece head and tail temperature difference; Be milling train can be on the rolled piece random length constant raising speed function so that improve the coolant-temperature gage of going into of rolled piece afterbody, thereby improve the uniformity of the vertical mechanical property of steel plate.Can realizing of above function with the final performance that directly determines dual phase steel or low yield strength ratio steel.
Summary of the invention
Technical problem to be solved by this invention is; Overcome the shortcoming of prior art; Provide a kind of single chassis steekle mill to produce the cooling controlling and rolling controlling process of dual phase steel; Comprehensive Control duplex structure, stress ratio and yield tensile ratio meet the demands simultaneously, realize the flat required performance of high-end dual phase steel of rolling of single chassis steekle mill hot rolling.
The technical scheme that the present invention solves above technical problem is:
A kind of single chassis steekle mill is produced the cooling controlling and rolling controlling process of dual phase steel, comprising:
1180～1210 ℃ of the hot stove tapping temperatures of (1); 880～930 ℃ of two-stage start rolling temperatures, 770～840 ℃ of finishing temperatures are gone into 680～770 ℃ of coolant-temperature gages (temperature when steel plate gets into laminar cooling system); Temperature control plate blank thickness 2.8～3.8h (h is the finished steel plate thickness) returns 0～350 ℃ of red temperature;
(2) adopts roughing 4 passages, finish rolling 7 passages and treats the strange passage rolling mode of warm 2 passages, or adopts roughing 4 passages, finish rolling 6 passages and treat the even passage rolling mode of warm 1 passage;
The (3) rolling pass is 10 even passages, and correspondence treats that warm passage is 1 passage, and rolling pass is 11 strange passages, and correspondence treats that warm passage is 2 passages; Rolling ends of idol passage back rolled piece is temperature control before machine automatically, treat that the temperature control time satisfies technological requirement after, milling train treats that warm 1 road realizes throwing steel automatically; Rolling ends of strange passage back rolled piece treats that warm 1 road returns temperature control before the machine automatically, treats that temperature control finishes the back milling train and treats that warm 1 passage realizes throwing steel automatically after by machine;
When the (4) rolling pass is even passage, treat that warm passage mill speed is the same with finish to gauge speed; When rolling pass is strange passage, treat that the mill speed of temperature the 2nd passage is the same with finish to gauge speed;
The (5) rolled piece temperature automatically controlled with throw steel after, milling train is thrown steel speed specifying on the length of rolled piece, brings into use constant acceleration; So that improve the coolant-temperature gage of going into of rolled piece; Thereby improve the head and tail temperature difference and the performance uniformity of rolled piece, the position of acceleration is 0m～length of rolled piece, and acceleration magnitude is 0m/s
2～0.03 m/s
2
(6) is because rolled piece has 2 temperature control stages; Cause the steel plate secondary oxidation serious; Reduce being pressed into of iron scale for improving plate surface quality; In two-stage open rolling first passage, milling train uses high-pressure low-flow descaling or high-pressure high-flow de-scaling, and passage is used high-pressure low-flow descaling before the rolled piece entry simultaneously.
The technical scheme that the present invention further limits is:
Aforesaid single chassis steekle mill is produced the cooling controlling and rolling controlling process of dual phase steel, and among the step (6), high-pressure low-flow pressure is 24Mpa, and discharge is 180m
3/ h; The equal 20Mpa of high-pressure high-flow de-scaling pressure, discharge is 400m
3/ h.
Aforesaid single chassis steekle mill is produced the cooling controlling and rolling controlling process of dual phase steel, uses the duplex structure steel of thickness as blank rolling thickness≤32mm of 150mm, the longest 8.6m that can be of flat charge length of rolling.
Aforesaid single chassis steekle mill is produced the cooling controlling and rolling controlling process of dual phase steel, and rolled piece gets into before the straightener, and according to along >=75% above plastic deformation requirement takes place on the thickness direction, straightener aligning speed is no more than 0.75m/s; If wooden dipper is bent end to end, adjustment inlet and outlet limit roller height are set, optimize aligning speed; If bilateral unrestrained wooden dipper bent plate shape then uses bending roller force to align; If monolateral unrestrained wooden dipper is bent, then suitably transfer fore side and transmission side roll gap difference to align.
Aforesaid single chassis steekle mill is produced the cooling controlling and rolling controlling process of dual phase steel; The blank actual size is 150*3185*6500mm, and finished product thickness is 15.3mm, rolling 11 passages; Treat 2 passages of temperature; Be divided into three rolling sequences: a stage puts down and rolls 4 passages, and the two-stage puts down and rolls 7 passages, treats 2 passages of temperature at last; Cooling controlling and rolling controlling process may further comprise the steps:
⑴ the heating-up temperature of blank in heating furnace is increased to 1190 ℃, and heating furnace tapping back is earlier by the thick de-scaling of descaling mill;
⑵ get into milling train, rolling pass 4+7+2 road, and after the rolling end of a stage, swing was lowered the temperature before rolled piece was got back to machine, and when the rolled piece temperature was reduced to 910 ℃, milling train got into milling train and begins the finish rolling stage rolling;
⑶ the finish rolling stage, the automatic de-scaling of the open rolling first passage milling train high-pressure low-flow, finish rolling the 11st percentage pass reduction is 10.05%; After the rolling end of the 11st passage, the rolled piece finishing temperature is treated temperature according to the reduction ratio of 4.5m/s speed and 0% after satisfying 780～820 ℃ of requirements; Rolled piece gets into milling train and throws steel behind the 25s; Corresponding the 13rd percentage pass reduction is 0%, and rolled piece gets into before the laminar cooling system, and rolled piece is gone into 740～720 ℃ of coolant-temperature gages; It is 1.80m/s that milling train is thrown steel speed, and the milling train constant acceleration that comes into operation is 0.023m/s at length of rolled piece 25m place
2
⑷ after rolled piece got into laminar cooling system, water was than 2.30, and after rolled piece left laminar cooling system, rolled piece returned red temperature less than 150 ℃;
⑸ after rolled piece got into thermal straightening machine, straightener inlet roll gap was 12.0mm, and the outlet roll gap is 15.3mm, and straightening force is more than 1000 tons, and rolled piece aligning speed end to end is 0.50m/s, intermediate body member aligning speed 0.75m/s.
Aforesaid single chassis steekle mill is produced the cooling controlling and rolling controlling process of dual phase steel; The blank actual size is 150*2575*6800mm, and finished product thickness is 25m, rolling 10 passages, treat the temperature 1 passage; Be divided into three rolling sequences: a stage puts down and rolls 4 passages; Two-stage puts down and rolls 6 passages, treats 1 passage of temperature at last, the automatic de-scaling of the high-pressure low-flow of milling train when treating temperature; Cooling controlling and rolling controlling process may further comprise the steps:
⑴ the heating-up temperature of blank in heating furnace 1 is increased to 1200 ℃, and heating furnace tapping back is earlier by descaling mill 2 thick de-scalings, and after the thick de-scaling, the 1# pyrometer detects blank 1 temperature and is not less than 1160 ℃.
⑵ get into milling train 4, rolling pass 4+6+1 road, and after the rolling end of a stage, before rolled piece was got back to machine, in the zone swing cooling of 2# pyrometer, when the 2# pyrometer detected temperature and reduces to 930 ℃, milling train got into milling train 4, beginning finish rolling stage rolling.
⑶ the finish rolling stage is after the 10th percentage pass reduction is the rolling end of 11.55%, the 10 passage; Rolled piece is swung temperature control in 2# pyrometer district; Temperature control 5s finished the back rolled piece and got into 4 milling trains throwing steel by the control of one-level logical program the temperature control time, and corresponding the 13rd percentage pass reduction is 0%; Rolled piece gets into before the laminar cooling system 6, and the 3# pyrometer detects rolled piece and goes into coolant-temperature gage at 740～760 ℃; The throwing steel speed of milling train 4 is 1.80m/s, the automatic de-scaling of the high-pressure low-flow of milling train 4, and the milling train constant acceleration that comes into operation is 0.023m/s at length of rolled piece 25m place
2
⑷ after rolled piece got into cooling system 6, water was than 2.5, and after rolled piece left laminar cooling system 6, the 4# pyrometer detected rolled piece and returns 300～350 ℃ of red temperature.
⑸ after rolled piece got into thermal straightening machine 7, straightener inlet roll gap was 22.0mm, and the outlet roll gap is 25mm, and straightening force is more than 1200 tons, and rolled piece aligning speed end to end is 0.50m/s, intermediate body member aligning speed 0.75m/s.
The invention has the beneficial effects as follows: the present invention can put down the longest 8.6m that can be of the charge length of rolling; When using thickness as the high-end duplex structure steel of blank rolling thickness≤32mm of 150mm, when institutional framework meets the demands plate property also to satisfy counter stress than with the specific (special) requirements of yield tensile ratio.The present invention can improve the uniformity that rolled piece is gone into coolant-temperature gage; Improved properties percent of pass, improved plate surface quality, Comprehensive Control duplex structure; Stress ratio and yield tensile ratio meet the demands simultaneously, realize the flat required performance of high-end dual phase steel of rolling of single chassis steekle mill hot rolling.
The present invention develop 3500mm single chassis steekle mill roughing 4 passages, finish rolling 7 passages, treat the new rolling mode of warm 2 passages; Roughing 4 passages, finish rolling 6 passages of exploitation steekle mill, treat the new rolling mode of warm 1 passage, exploitation finish rolling the 1st passage with treat warm passage high-pressure low-flow descaling process, warm pass speed function is treated in the control of exploitation one-level programmed logic; The temperature automatically controlled function in exploitation steekle mill finish rolling end back; Exploitation steekle mill finish rolling finishes the back and throws steel functional automatically, and exploitation steekle mill constant raising speed function etc. on the rolled piece random length has solved the problem that occurs in the high-end special elaboration production process of single chassis steekle mill hot rolling; Realized that finish rolling finishes temperature automatically controlledly manually to throw steel after steel replaces the artificial several seconds with throwing; Improve rolled piece and go into the uniformity of coolant-temperature gage, improved properties percent of pass, improved plate surface quality.
Description of drawings
Fig. 1 is a device connection diagram of the present invention.
The specific embodiment
A kind of single chassis steekle mill is produced the cooling controlling and rolling controlling process of dual phase steel, and this steel requires to be organized as double structure, and stress ratio 1 satisfies and is lower than 1.14 requirements simultaneously, and stress ratio 2 satisfies and is lower than 1.06 requirements, and stress ratio 3 satisfies and is lower than 1.15, and vertically yield tensile ratio is lower than 0.76.1190 ℃ of technological requirement tapping temperatures, rolling pass 4+7+2 road, 910 ℃ of two-stage start rolling temperatures; Temperature control plate blank thickness 3.2h; The automatic de-scaling of the finish rolling first passage milling train high-pressure low-flow, the 11st percentage pass reduction is 10.05%, 780～820 ℃ of finishing temperatures; Finish rolling finishes to throw steel automatically after the back one-level is set the preceding swing of rolled piece machine 25s, and the 12nd passage and the 13rd percentage pass reduction of correspondence are 0% simultaneously; Finish to gauge speed and the 13rd passage are thrown steel speed and are 1.80m/s, and the 12nd passage treats that warm speed is controlled to be 4.5m/s by the one-level logical program, and the 13rd passage uses acceleration to be 0.023m/s at length of rolled piece 25m place after throwing steel
2Rolled piece is gone into 720～740 ℃ of coolant-temperature gages, and cooling water water ratio is 2.3, final cooling temperature is not higher than 150 ℃; Straightener gateway roll gap is set according to along steel plate thickness 80% above plastic deformation taking place, and aligns speed 0.5m/s end to end, intermediate body member aligning speed 0.75m/s.
Present embodiment is selected 1 flat plate X80HD large-deformation-resistance pipeline that rolls, and tissue requires to be pro-eutectoid ferrite and bainite for double structure; Yield tensile ratio requires to be lower than 0.76, and the blank actual size is 150*3185*6500mm, and finished product thickness is 15.3mm; Rolling 11 passages are treated 2 passages of temperature, are divided into three rolling sequences: a stage puts down and rolls 4 passages; Two-stage puts down and rolls 7 passages, treats 2 passages of temperature at last.Detailed process is following, sees Fig. 1:
⑴ the heating-up temperature of blank in heating furnace 1 is increased to 1190 ℃, and heating furnace tapping back is earlier by descaling mill 2 thick de-scalings, and after the thick de-scaling, the 1# pyrometer detects blank 1 temperature and is not less than 1150 ℃; Heating furnace tapping back is earlier by descaling mill 2 thick de-scalings, again coiler furnace 5 behind coiler furnace 3, four roll reversing rollers 4 and the machine before machine successively.
⑵ get into milling train 4, rolling pass 4+7+2 road, and after the rolling end of a stage, before rolled piece was got back to machine, in the zone swing cooling of 2# pyrometer, when the 2# pyrometer detected temperature and reduces to 910 ℃, milling train got into milling train 4, beginning finish rolling stage rolling.
⑶ the finish rolling stage, the automatic de-scaling of high-pressure low-flow of the open rolling first passage milling train 4, finish rolling the 11st percentage pass reduction is 10.05%; After the rolling end of the 11st passage, rolled piece is controlled by the one-level logical program after satisfied 780～820 ℃ of requirements of finishing temperature are detected in 3# pyrometer district again; Reduction ratio according to 4.5m/s speed and 0% is treated temperature, be back to machine from the 3# pyrometer before 2# pyrometer district carry out temperature control, the temperature control time is controlled by the one-level logical program; Temperature control 25s finishes the back rolled piece and gets into milling train 4 throwing steel; Corresponding the 13rd percentage pass reduction is 0%, and rolled piece gets into before the laminar cooling system 6, and the 3# pyrometer detects rolled piece and goes into coolant-temperature gage at 740～720 ℃; It is 1.80m/s that milling train 4 is thrown the steel speed, and the milling train constant acceleration that comes into operation is 0.023m/s at length of rolled piece 25m place
2
⑷ after rolled piece got into laminar cooling system 6, water was than 2.30, and after rolled piece left laminar cooling system 6, the 4# pyrometer detected rolled piece and returns red temperature less than 150 ℃.
⑸ after rolled piece got into thermal straightening machine 7, straightener inlet roll gap was 12.0mm, and the outlet roll gap is 15.3mm, and straightening force is more than 1000 tons, and rolled piece aligning speed end to end is 0.50m/s, intermediate body member aligning speed 0.75m/s.
A kind of single chassis steekle mill is produced the cooling controlling and rolling controlling process of dual phase steel, 1200 ℃ of this technological requirement tapping temperatures of this technological requirement, rolling pass 4+6+1 road; 930 ℃ of two-stage start rolling temperatures; Temperature control plate blank thickness 3.5h, the 10th percentage pass reduction are 11.55%, 790～830 ℃ of finishing temperatures; Finish rolling finishes to throw steel automatically after the back one-level is set the preceding swing of rolled piece machine 5s, and the 11st percentage pass reduction of correspondence is 0% simultaneously; Finish to gauge speed and the 11st passage are thrown steel speed and are 1.80m/s, and the 11st passage uses acceleration to be 0.025m/s at length of rolled piece 23m place after throwing steel
2Rolled piece is gone into 740～760 ℃ of coolant-temperature gages, and cooling water water ratio is 2.5,300～350 ℃ of final cooling temperatures; Straightener gateway roll gap is set according to along steel plate thickness 85% above plastic deformation taking place, and aligns speed 0.5m/s end to end, intermediate body member aligning speed 0.75m/s.
Present embodiment is selected 1 block of flat plate Q550 high-strength steel that rolls, and the yield tensile ratio of steel plate requires to be lower than 0.85, and the blank actual size is 150*2575*6800mm; Finished product thickness is 25m; Rolling 10 passages, treat 1 passage of temperature, be divided into three rolling sequences: a stage is flat rolls 4 passages, and the two-stage is flat rolls 6 passages; Treat 1 passage of temperature at last, the automatic de-scaling of the high-pressure low-flow of milling train when treating temperature.Detailed process is following, sees Fig. 1:
⑴ the heating-up temperature of blank in heating furnace 1 is increased to 1200 ℃, and heating furnace tapping back is earlier by descaling mill 2 thick de-scalings, and after the thick de-scaling, the 1# pyrometer detects blank 1 temperature and is not less than 1160 ℃; Heating furnace tapping back is earlier by descaling mill 2 thick de-scalings, again coiler furnace 5 behind coiler furnace 3, four roll reversing rollers 4 and the machine before machine successively.
⑵ get into milling train 4, rolling pass 4+6+1 road, and after the rolling end of a stage, before rolled piece was got back to machine, in the zone swing cooling of 2# pyrometer, when the 2# pyrometer detected temperature and reduces to 930 ℃, milling train got into milling train 4, beginning finish rolling stage rolling.
⑶ the finish rolling stage is after the 10th percentage pass reduction is the rolling end of 11.55%, the 10 passage; Rolled piece is swung temperature control in 2# pyrometer district; Temperature control 5s finished the back rolled piece and got into 4 milling trains throwing steel by the control of one-level logical program the temperature control time, and corresponding the 13rd percentage pass reduction is 0%; Rolled piece gets into before the laminar cooling system 6, and the 3# pyrometer detects rolled piece and goes into coolant-temperature gage at 740～760 ℃; The throwing steel speed of milling train 4 is 1.80m/s, the automatic de-scaling of the high-pressure low-flow of milling train 4, and the milling train constant acceleration that comes into operation is 0.023m/s at length of rolled piece 25m place
2
⑷ after rolled piece got into cooling system 6, water was than 2.5, and after rolled piece left laminar cooling system 6, the 4# pyrometer detected rolled piece and returns 300～350 ℃ of red temperature.
⑸ after rolled piece got into thermal straightening machine 7, straightener inlet roll gap was 22.0mm, and the outlet roll gap is 25mm, and straightening force is more than 1200 tons, and rolled piece aligning speed end to end is 0.50m/s, intermediate body member aligning speed 0.75m/s.
Except that the foregoing description, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (10)
1. a single chassis steekle mill is produced the cooling controlling and rolling controlling process of dual phase steel, it is characterized in that: comprising:
1180～1210 ℃ of (1) heating furnace tapping temperatures, 880～930 ℃ of two-stage start rolling temperatures, 770～840 ℃ of finishing temperatures are gone into 680～770 ℃ of coolant-temperature gages, and temperature control plate blank thickness 2.8～3.8 finished steel plate thickness return 0～350 ℃ of red temperature;
(2) adopts roughing 4 passages, finish rolling 7 passages and treats the strange passage rolling mode of warm 2 passages, or adopts roughing 4 passages, finish rolling 6 passages and treat the even passage rolling mode of warm 1 passage;
The (3) rolling pass is 10 even passages, and correspondence treats that warm passage is 1 passage, and rolling pass is 11 strange passages, and correspondence treats that warm passage is 2 passages; Rolling ends of idol passage back rolled piece is temperature control before machine automatically, treat that the temperature control time satisfies technological requirement after, milling train treats that warm 1 road realizes throwing steel automatically; Rolling ends of strange passage back rolled piece treats that warm 1 road returns temperature control before the machine automatically, treats that temperature control finishes the back milling train and treats that warm 1 passage realizes throwing steel automatically after by machine;
When the (4) rolling pass is even passage, treat that warm passage mill speed is the same with finish to gauge speed; When rolling pass is strange passage, treat that the mill speed of temperature the 2nd passage is the same with finish to gauge speed;
The (5) rolled piece temperature automatically controlled with throw steel after, milling train is thrown steel speed specifying on the length of rolled piece, brings into use constant acceleration; So that improve the coolant-temperature gage of going into of rolled piece; Thereby improve the head and tail temperature difference and the performance uniformity of rolled piece, the position of acceleration is 0m～length of rolled piece, and acceleration magnitude is 0m/s
2～0.03 m/s
2
(6) is in two-stage open rolling first passage, and milling train uses high-pressure low-flow descaling or high-pressure high-flow de-scaling, and passage is used high-pressure low-flow descaling before the rolled piece entry simultaneously.
2. single chassis steekle mill as claimed in claim 1 is produced the cooling controlling and rolling controlling process of dual phase steel, and it is characterized in that: among the step (6), high-pressure low-flow pressure is 24Mpa, and discharge is 180m
3/ h; The equal 20Mpa of high-pressure high-flow de-scaling pressure, discharge is 400m
3/ h.
3. single chassis steekle mill as claimed in claim 1 is produced the cooling controlling and rolling controlling process of dual phase steel, it is characterized in that: use the duplex structure steel of thickness as blank rolling thickness≤32mm of 150mm, the longest 8.6m that can be of flat charge length of rolling.
4. single chassis steekle mill as claimed in claim 1 is produced the cooling controlling and rolling controlling process of dual phase steel; It is characterized in that: rolled piece gets into before the straightener; According to along >=75% above plastic deformation requirement takes place on the thickness direction, straightener aligning speed is no more than 0.75m/s; If wooden dipper is bent end to end, adjustment inlet and outlet limit roller height are set, optimize aligning speed; If bilateral unrestrained wooden dipper bent plate shape then uses bending roller force to align; If monolateral unrestrained wooden dipper is bent, then suitably transfer fore side and transmission side roll gap difference to align.
5. produce the cooling controlling and rolling controlling process of dual phase steels like claim 1 or 2 or 3 or 4 described single chassis steekle mills; It is characterized in that: the blank actual size is 150*3185*6500mm, and finished product thickness is 15.3mm, rolling 11 passages; Treat 2 passages of temperature; Be divided into three rolling sequences: a stage puts down and rolls 4 passages, and the two-stage puts down and rolls 7 passages, treats 2 passages of temperature at last; Cooling controlling and rolling controlling process may further comprise the steps:
⑴ the heating-up temperature of blank in heating furnace is increased to 1190 ℃, and heating furnace tapping back is earlier by the thick de-scaling of descaling mill;
⑵ get into milling train, rolling pass 4+7+2 road, and after the rolling end of a stage, swing was lowered the temperature before rolled piece was got back to machine, and when the rolled piece temperature was reduced to 910 ℃, milling train got into milling train and begins the finish rolling stage rolling;
⑶ the finish rolling stage, the automatic de-scaling of the open rolling first passage milling train high-pressure low-flow, finish rolling the 11st percentage pass reduction is 10.05%; After the rolling end of the 11st passage, the rolled piece finishing temperature is treated temperature according to the reduction ratio of 4.5m/s speed and 0% after satisfying 780～820 ℃ of requirements; Rolled piece gets into milling train and throws steel behind the 25s; Corresponding the 13rd percentage pass reduction is 0%, and rolled piece gets into before the laminar cooling system, and rolled piece is gone into 740～720 ℃ of coolant-temperature gages; It is 1.80m/s that milling train is thrown steel speed, and the milling train constant acceleration that comes into operation is 0.023m/s at length of rolled piece 25m place
2
⑷ after rolled piece got into laminar cooling system, water was than 2.30, and after rolled piece left laminar cooling system, rolled piece returned red temperature less than 150 ℃;
⑸ after rolled piece got into thermal straightening machine, straightener inlet roll gap was 12.0mm, and the outlet roll gap is 15.3mm, and straightening force is more than 1000 tons, and rolled piece aligning speed end to end is 0.50m/s, intermediate body member aligning speed 0.75m/s.
6. produce the cooling controlling and rolling controlling process of dual phase steels like claim 1 or 2 or 3 or 4 described single chassis steekle mills; It is characterized in that: the blank actual size is 150*2575*6800mm, and finished product thickness is 25m, rolling 10 passages, treat the temperature 1 passage; Be divided into three rolling sequences: a stage puts down and rolls 4 passages; Two-stage puts down and rolls 6 passages, treats 1 passage of temperature at last, the automatic de-scaling of the high-pressure low-flow of milling train when treating temperature; Cooling controlling and rolling controlling process may further comprise the steps:
⑴ the heating-up temperature of blank in heating furnace 1 is increased to 1200 ℃, and heating furnace tapping back is earlier by descaling mill 2 thick de-scalings, and after the thick de-scaling, the 1# pyrometer detects blank 1 temperature and is not less than 1160 ℃.
7. ⑵ gets into milling train 4, rolling pass 4+6+1 road, and after the rolling end of a stage, before rolled piece is got back to machine, the swing cooling in 2# pyrometer zone, when the 2# pyrometer detected temperature and reduces to 930 ℃, milling train got into milling train 4, beginning finish rolling stage rolling.
8. ⑶ finish rolling stage is after the 10th percentage pass reduction is the rolling end of 11.55%, the 10 passage; Rolled piece is swung temperature control in 2# pyrometer district; Temperature control 5s finished the back rolled piece and got into 4 milling trains throwing steel by the control of one-level logical program the temperature control time, and corresponding the 13rd percentage pass reduction is 0%; Rolled piece gets into before the laminar cooling system 6, and the 3# pyrometer detects rolled piece and goes into coolant-temperature gage at 740～760 ℃; The throwing steel speed of milling train 4 is 1.80m/s, the automatic de-scaling of the high-pressure low-flow of milling train 4, and the milling train constant acceleration that comes into operation is 0.023m/s at length of rolled piece 25m place
2
9. after the ⑷ rolled piece got into cooling system 6, water was than 2.5, and after rolled piece left laminar cooling system 6, the 4# pyrometer detected rolled piece and returns 300～350 ℃ of red temperature.
10. after the ⑸ rolled piece got into thermal straightening machine 7, straightener inlet roll gap was 22.0mm, and the outlet roll gap is 25mm, and straightening force is more than 1200 tons, and rolled piece aligning speed end to end is 0.50m/s, intermediate body member aligning speed 0.75m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210288351.8A CN102806233B (en) | 2012-08-14 | 2012-08-14 | Controlled rolling and controlled cooling process for manufacturing double-phase steel by single-shelf steckel mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210288351.8A CN102806233B (en) | 2012-08-14 | 2012-08-14 | Controlled rolling and controlled cooling process for manufacturing double-phase steel by single-shelf steckel mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102806233A true CN102806233A (en) | 2012-12-05 |
| CN102806233B CN102806233B (en) | 2014-11-26 |
Family
ID=47230205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210288351.8A Active CN102806233B (en) | 2012-08-14 | 2012-08-14 | Controlled rolling and controlled cooling process for manufacturing double-phase steel by single-shelf steckel mill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102806233B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974612A (en) * | 2012-12-12 | 2013-03-20 | 南京钢铁股份有限公司 | Process for rolling thin low-temperature tank box steel plate by using rolling machine with single machine frame furnace |
| CN103599928A (en) * | 2013-12-02 | 2014-02-26 | 南京钢铁股份有限公司 | Production method for rolling special pipeline steel through steckle mill |
| CN108284135A (en) * | 2017-12-29 | 2018-07-17 | 南京钢铁股份有限公司 | A method of quickly searching straightener roll marks using table check system |
| CN109174964A (en) * | 2018-08-01 | 2019-01-11 | 南京钢铁股份有限公司 | A kind of control method of steel for welded structures plate surface piebald |
| CN109513752A (en) * | 2018-11-02 | 2019-03-26 | 北京首钢股份有限公司 | A method of controlling thin narrow specification mild steel tail portion middle wave |
| CN110479762A (en) * | 2019-08-15 | 2019-11-22 | 武汉钢铁有限公司 | A kind of hot-strip completely continuous manufacturing device and method for ferrite rolling |
| CN114260320A (en) * | 2020-09-16 | 2022-04-01 | 宝山钢铁股份有限公司 | Intermediate cooling control method for overcoming temperature deviation of medium plate heating furnace |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH108142A (en) * | 1996-06-26 | 1998-01-13 | Kawasaki Steel Corp | Manufacture of steel sheet for can manufacture, excellent in workability and free from surface roughing |
| JP2004136291A (en) * | 2002-10-15 | 2004-05-13 | Nippon Steel Corp | Device and method for controlling temperature of strip in hot rolling line, computer program, and computer-readable storage medium |
| CN101700526A (en) * | 2009-11-20 | 2010-05-05 | 南京钢铁股份有限公司 | Temperature control rolling process of single-rack steckel mill after final rolling |
| CN101862760A (en) * | 2009-12-10 | 2010-10-20 | 南京钢铁股份有限公司 | High-pressure low-flow descaling process of four-roller reversing steckel mill |
| CN102266866A (en) * | 2011-07-12 | 2011-12-07 | 南京钢铁股份有限公司 | Technology for producing hot-rolled pipeline steel of roll mill with single frame furnace |
| CN102513370A (en) * | 2011-12-16 | 2012-06-27 | 南京钢铁股份有限公司 | Control process for single-stand Steckel mill to produce special-purpose pipeline steel |
-
2012
- 2012-08-14 CN CN201210288351.8A patent/CN102806233B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH108142A (en) * | 1996-06-26 | 1998-01-13 | Kawasaki Steel Corp | Manufacture of steel sheet for can manufacture, excellent in workability and free from surface roughing |
| JP2004136291A (en) * | 2002-10-15 | 2004-05-13 | Nippon Steel Corp | Device and method for controlling temperature of strip in hot rolling line, computer program, and computer-readable storage medium |
| CN101700526A (en) * | 2009-11-20 | 2010-05-05 | 南京钢铁股份有限公司 | Temperature control rolling process of single-rack steckel mill after final rolling |
| CN101862760A (en) * | 2009-12-10 | 2010-10-20 | 南京钢铁股份有限公司 | High-pressure low-flow descaling process of four-roller reversing steckel mill |
| CN102266866A (en) * | 2011-07-12 | 2011-12-07 | 南京钢铁股份有限公司 | Technology for producing hot-rolled pipeline steel of roll mill with single frame furnace |
| CN102513370A (en) * | 2011-12-16 | 2012-06-27 | 南京钢铁股份有限公司 | Control process for single-stand Steckel mill to produce special-purpose pipeline steel |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974612A (en) * | 2012-12-12 | 2013-03-20 | 南京钢铁股份有限公司 | Process for rolling thin low-temperature tank box steel plate by using rolling machine with single machine frame furnace |
| CN102974612B (en) * | 2012-12-12 | 2014-11-05 | 南京钢铁股份有限公司 | Process for rolling thin low-temperature tank box steel plate by using rolling machine with single machine frame furnace |
| CN103599928A (en) * | 2013-12-02 | 2014-02-26 | 南京钢铁股份有限公司 | Production method for rolling special pipeline steel through steckle mill |
| CN108284135A (en) * | 2017-12-29 | 2018-07-17 | 南京钢铁股份有限公司 | A method of quickly searching straightener roll marks using table check system |
| CN109174964A (en) * | 2018-08-01 | 2019-01-11 | 南京钢铁股份有限公司 | A kind of control method of steel for welded structures plate surface piebald |
| CN109513752A (en) * | 2018-11-02 | 2019-03-26 | 北京首钢股份有限公司 | A method of controlling thin narrow specification mild steel tail portion middle wave |
| CN110479762A (en) * | 2019-08-15 | 2019-11-22 | 武汉钢铁有限公司 | A kind of hot-strip completely continuous manufacturing device and method for ferrite rolling |
| WO2021027908A1 (en) * | 2019-08-15 | 2021-02-18 | 武汉钢铁有限公司 | Hot-rolled strip steel fully-continuous production device and method for ferrite rolling |
| CN114260320A (en) * | 2020-09-16 | 2022-04-01 | 宝山钢铁股份有限公司 | Intermediate cooling control method for overcoming temperature deviation of medium plate heating furnace |
| CN114260320B (en) * | 2020-09-16 | 2024-03-08 | 宝山钢铁股份有限公司 | Intermediate cooling control method for overcoming temperature deviation of medium plate heating furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102806233B (en) | 2014-11-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102806233B (en) | Controlled rolling and controlled cooling process for manufacturing double-phase steel by single-shelf steckel mill | |
| CN102179406B (en) | Method for rolling thin high-strength steel plate of single-frame steckel mill | |
| CN102266866B (en) | Technology for producing hot-rolled pipeline steel of roll mill with single frame furnace | |
| CN102688884B (en) | Rolling process of limit-specification steel plate of 2800mm double-stand heavy and medium plate mill | |
| CN102513370A (en) | Control process for single-stand Steckel mill to produce special-purpose pipeline steel | |
| CN102699023B (en) | Plate shape control method of hot-rolling and coiled-rolling steel plate of single-rack steekle mill | |
| CN102189119A (en) | Process for controlling shape of hot-rolled flat-rolled high-grade pipeline steel plate by using single-rack steckel mill | |
| CN102671941A (en) | Process for producing thin gauge pipeline steel by using double-stand medium and heavy plate mill | |
| CN104550234A (en) | Rolling method of pipeline steel and stainless steel composite plate | |
| CN102699022A (en) | Control method for limit specification steel roll hot rolling by single-stand steekle mill | |
| CN104451386B (en) | A kind of low yield strength ratio oil reserve is 610Mpa high-strength steel sheet and manufacture method thereof for tank body | |
| CN111020437B (en) | Manufacturing method of hot-dip galvanized steel strip with yield strength of above 580Mpa grade | |
| CN112108527B (en) | Method for controlling plate shape of steel for hot-rolled high-strength stirring tank body | |
| CN101956126A (en) | Cold-base high-strength galvanized sheet and production method thereof | |
| CN106987773A (en) | A kind of high strength steel plate and its board-shape control method | |
| CN105772502A (en) | Asymmetrical rolling method for producing high-grade non-oriented silicon steel | |
| CN102172830B (en) | Compound production line system | |
| CN111167858A (en) | Method for headless rolling of ferrite area of ultrathin strip steel | |
| CN105200332A (en) | 700 MPa level thin-gauge high-strength steel strip and production method thereof | |
| CN104588418B (en) | A kind of method eliminating ultra-low-carbon steel surface pit defect | |
| CN102225432A (en) | Control process for performances of steel plate during hot rolling and flat rolling process of single-stand steckel mill | |
| CN107983771A (en) | The high-strength chill volume hot-rolling method of building concrete fixing piece | |
| CN111790754A (en) | Thin X65 steel grade pipeline steel for single-stand steckel mill and rolling method | |
| CN104726665A (en) | Hot rolling technique of X80 pipeline steel coil plate | |
| CN103290311B (en) | Method for manufacturing civil high-grade anti-theft door plank |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |