CN102337386A - Production process of high-toughness and ultra-high strength steel and production system thereof - Google Patents

Production process of high-toughness and ultra-high strength steel and production system thereof Download PDF

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Publication number
CN102337386A
CN102337386A CN2011103586552A CN201110358655A CN102337386A CN 102337386 A CN102337386 A CN 102337386A CN 2011103586552 A CN2011103586552 A CN 2011103586552A CN 201110358655 A CN201110358655 A CN 201110358655A CN 102337386 A CN102337386 A CN 102337386A
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steel
steel plate
production
temperature
plate
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CN2011103586552A
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Inventor
杨云清
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Hunan Valin Xiangtan Iron and Steel Co Ltd
Hunan Hualing Xiangtan Iron and Steel Co Ltd
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Hunan Hualing Xiangtan Iron and Steel Co Ltd
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Priority to CN2011103586552A priority Critical patent/CN102337386A/en
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Abstract

The invention relates to a production process of high-toughness and ultra-high strength steel and a production system thereof. The production system comprises a descaling box, a roughing mill, a temperature waiting roller table, a finishing mill, an ultra-fast cooling system, a thermal straightening machine, steel splitting racks and an open flame tempering furnace. The production process comprises the following steps of: fully heating a plate blank, discharging the plate blank from a furnace, descaling the plate blank, sequentially performing rough rolling, temperature waiting, finish rolling, on-line ultra-fast quenching and fast thermal straightening, separating the plate blank from a main production line through the steel splitting racks, fast sending a steel plate into the open flame tempering furnace for heat insulation, performing carbon distribution at PT (carbon distribution temperature), discharging the steel plate from the furnace, and then performing air cooling. The sequential arrangement of equipment of the production line is as follows: the heating furnace, the plate blank, the descaling box, the roughing mill, an intermediate blank, the finishing mill, a pre-straightening machine, an ultra-fast cooling unit, the thermal straightening machine, the first steel splitting rack, the open flame tempering furnace, the second steel splitting rack, a thick plate cooling bed and an intermediate plate cooling bed.

Description

The production technique of H.T. super-high strength steel and production system
Technical field
The invention belongs to steel-smelting technology, particularly relate to a kind of production technique and production system of H.T. super-high strength steel.
Background technology
High strength structure plate is widely used in industries such as engineering machinery, mining machinery, vehicle, boats and ships, bridge; Along with development and national economy, high-strength steel has been proposed new requirement: intensity higher (more than the 1000MPa), requirement have certain plasticity and low-temperature flexibility.Each Heavy Plate Plant has been carried out a large amount of research for this reason, has developed the working method and the production technique of many high-strength steel.
The technology of each steel mill's production high-strength steel is generally CR, CR+ACC (TMCP)+T, DQ+T and off-line quenching RQ+T at present.In typical production technique, that need particularly point out is direct-on-line quenching technology (DQ).Direct quenching is to utilize the back waste heat that rolls of steel to be cooled to finally obtain under the martensite point temperature martensitic thermal treatment process to steel from the deformation austenite.Because the abundant dissolving of controlled rolling process interalloy element has increased austenitic hardening capacity; Help direct quenching subsequently; In addition the controlled rolling refinement austenite crystal, increased the austenite deformation band, therefore increased martensitic forming core point; Be expected to obtain good morphology of martensite, thereby obtain good intensity and toughness combination after the tempering.
When direct-on-line quenched, alloy in the steel and microalloy element solid solution attitude were better, have increased the hardening capacity of steel; The distortion in non-recrystallization district has increased austenitic dislocation desity, has increased deformation bands.Above factor all is that the structure refinement after quenching provides favourable condition, makes that the armor plate strength after online direct quenching (DQ)+off-line tempering modifier treatment is higher.
Steel through the Q+P+T heat-treated sturcture is: tempered martensite+residual austenite.Q+P+T handles the back something lost has a certain amount of retained austenite, the toughness predicament of the plow-steel of partly loosening; Also have the intergranular precipitation of complicated carbide in the steel, make to be precipitation strength.High-strength steel production thermal treatment Q+P technology reheats after need steel plate being rolled, quenching, carbon distribute, and complex process is unfavorable for reducing production costs.Need in the workshop, have bad luck the logistics complicacy after steel plate rolls, the online craspedodrome rate of steel plate is low, and production management is loaded down with trivial details.
Summary of the invention
The present invention aims to provide a kind of production technique and production system that overcomes the H.T. super-high strength steel of above-mentioned prior art weak point.Steel plate is after controlled rolling; The ultrafast cool equipment of direct use is quenched to temperature between Ms and the Mf, forms martensite and residual austenite, is close to side outfit tempering stove at roller-way simultaneously and carries out the carbon distribution; Realize the carbon allocation process; Satisfy the processing requirement that quenching and carbon distribute, realize that technology is called direct quenching DQ (direct quenching)+online distribution OP (on line partitioning) technology, i.e. DQ+OP technology.
Technical scheme of the present invention:
The production technique of H.T. super-high strength steel and production system, its process step is:
A. slab heating, 1150~1250 ℃ of Heating temperatures, heating coefficient 8~12min/cm, 1130~1180 ℃ of tapping temperatures;
B. the abundant de-scaling of slab eliminates scale on surface;
C. start rolling temperature is 1050~1100 ℃, guarantees that roughing has the above draft of two passages greater than 15%, and realization high temperature is depressed rolling at a slow speed greatly, 950~970 ℃ of roughing finishing temperatures, and intermediate blank is controlled to be 2~4h;
D. treat warm roller-way treat the temperature 800~860 ℃;
E. the finish rolling start rolling temperature is 800~860 ℃, 780~840 ℃ of finishing temperatures, and steel plate rolls the back and gets into pre-straightening machine aligning;
F. ultrafast cold use DQ pattern, steel plate is gone into 760~830 ℃ of water temps, returns 150~350 ℃ of automatic distribution waters of red temperature and control roller table speed according to steel plate, and steel plate is sent into fast and is carried out DQ;
G. after steel plate goes out to control cold unit, send into thermal straightening machine fast and align, aligning speed is greater than 2m/min;
H. after steel plate goes out straightener, send branch steel stand to divide steel fast to furnace charging table;
I. the naked light tempering stove starts quick shove charge, steel plate is packed into carry out carbon in the stove and distribute, and shove charge speed press 20m/min and controlled, 150~450 ℃ of tempering furnace temperature, process speed 10~60m/min;
J. after the steel plate allocation process finishes, come out of the stove and return slab cold bed air cooling;
K. after steel plate DQ+OP handles, change other tempering stoves when needing tempering over to and carry out tempering.
The apparatus for production line of its production system is arranged and is followed successively by: process furnace, slab, De-scaling box, roughing mill, intermediate blank, finishing mill, pre-straightening machine, ultrafast cold unit, thermal straightening machine, first fen steel stand, naked light tempering stove, second fen steel stand, slab cold bed, middle plate cold bed.
The principle of the invention: utilize in the steel plate controlled rolling process alloy in the steel and microalloy element solid solution attitude better, increased the hardening capacity of steel; Non-recrystallization district rolling increased austenitic dislocation desity, increased deformation bands.Above factor all is that the structure refinement after quenching provides favourable condition, makes that the armor plate strength after online direct quenching (DQ)+off-line tempering modifier treatment is higher.According to returning red temperature (between Ms~Mf) after the selected quenching of steel plate material; Utilize ultrafast cold operation process speed control to return red temperature to the different thickness steel plate; Steel plate goes out ultrafastly to return red end after cold and in time send into tempering stove and carry out the carbon allocation process; Form the tissue of martensite and nano level residual austenite, utilize the processing quality of the uniform characteristics assurance of naked light tempering stove cryogenic temperature steel plate carbon allocation process, steel plate tissue, performance are even.
Compared with prior art, the present invention has the following advantages:
A. direct quenching DQ (direct quenching)+online distribution OP (on line partitioning) technology (being DQ+OP technology) has realized the simple production of super-high strength steel, has improved production efficiency, has reduced the production cost of super-high strength steel;
B. utilize the DQ technology to keep the austenitic dislocation desity and the deformation bands of controlled rolling steel plate, make steel plate have intensity and the toughness higher, can produce the above super-high strength steel of 1500MPa than off-line quenched nickelclad;
C. the OP of steel plate handles, and makes the mill logistics succinct, has improved the craspedodrome rate of steel sheet product, has reduced steel plate and in the workshop, has had bad luck, and has reduced the taking of semifinished product warehouse, and is convenient to production management;
D. before the steel plate DQ, carry out pre-straightening, it is good to produce the steel plate template;
E. naked light tempering stove low-temperature zone furnace temperature is even, and organize steel plate carbon distribution back, performance is even;
F. working method and production system also can be used for the production of TMCP+T steel plate.
Description of drawings
Fig. 1 is a H.T. super-high strength steel production system processing unit layout n..Among the figure: 1-process furnace, 2-slab, 3-De-scaling box, 4-roughing mill, 5-intermediate blank; The 6-finishing mill, 7-steel plate, 8-pre-straightening machine, the ultrafast cold unit of 9-, 10-thermal straightening machine; First fen steel stand of 11-, 12-naked light tempering stove, second fen steel stand of 13-, 14-slab cold bed, plate cold bed among the 15-.
Embodiment
Further specify the content of invention below in conjunction with embodiment.
As shown in the figure, the production system processing unit is arranged by following order successively: 1-process furnace, 2-slab, 3-De-scaling box; The 4-roughing mill, 5-intermediate blank, 6-finishing mill, 7-steel plate; 8-pre-straightening machine, the ultrafast cold unit of 9-, 10-thermal straightening machine, first fen steelframe of 11-; 12-naked light tempering stove, second fen steel stand of 13-, 14-slab cold bed, plate cold bed among the 15-.
Embodiment 1:260X2080X3450 slab rolling is produced 30X3200XL super-high strength steel plate.
Its process step is followed successively by:
A. slab heating, 1230~1250 ℃ of Heating temperatures, heating coefficient 9~10min/cm, 1150~1160 ℃ of tapping temperatures;
B. the abundant de-scaling of slab eliminates scale on surface;
C. start rolling temperature is 1050~1070 ℃, behind the slab broadening, guarantees during axial rolling that roughing has the above draft of two passages greater than 15%, and realization high temperature is depressed rolling at a slow speed greatly, 950~970 ℃ of roughing finishing temperatures, and intermediate blank is controlled to be 103mm;
D. treat warm roller-way treat the temperature to 830~850 ℃;
E. the finish rolling start rolling temperature is 830~850 ℃, 810~830 ℃ of finishing temperatures, and steel plate rolls the back and gets into pre-straightening machine aligning, and the rolling technology significant parameter is seen table 1;
Table 1 embodiment 1 rolling technology relates to significant parameter
F. ultrafast cold use DQ pattern, steel plate is gone into 790~810 ℃ of water temps, returns 350 ℃ of automatic distribution waters of red temperature and control roller table speed according to steel plate, and steel plate is sent into fast and is carried out DQ;
G. after steel plate goes out to control cold unit, send into thermal straightening machine fast and align, aligning speed 2.2m/min;
H. after steel plate goes out straightener, send branch steel stand to divide steel fast to furnace charging table;
I. the naked light tempering stove starts quick shove charge, steel plate is packed into carry out carbon in the stove and distribute, and shove charge speed press 20m/min control, and the tempering furnace temperature is carried out carbon distribution, process speed 18m/min for 220~250 ℃;
J. after the steel plate allocation process finishes, come out of the stove and return slab cold bed air cooling;
K. after steel plate DQ+OP handles, change other tempering stoves when needing tempering over to and carry out tempering.
Embodiment 2:260X2080X3450 slab rolling is produced 40X3500XL super-high strength steel plate.
Its process step is followed successively by:
A. slab heating, 1150~1250 ℃ of Heating temperatures, heating coefficient 9~10min/cm, 1130~1150 ℃ of tapping temperatures;
B. the abundant de-scaling of slab eliminates scale on surface;
C. start rolling temperature is 1050~1080 ℃, guarantees that roughing has the above draft of two passages greater than 15%, and realization high temperature is depressed rolling at a slow speed greatly, 950~970 ℃ of roughing finishing temperatures, and intermediate blank is controlled to be 94mm;
D. treat warm roller-way treat the temperature 820~840 ℃;
E. the finish rolling start rolling temperature is 820~840 ℃, 800~820 ℃ of finishing temperatures, and steel plate rolls the back and gets into pre-straightening machine aligning, and rolling technological parameter is seen table 2;
Table 2 embodiment 2 rolling technologys relate to significant parameter
F. ultrafast cold use DQ pattern, steel plate is gone into 780~800 ℃ of water temps, returns 250 ℃ of automatic distribution waters of red temperature and control roller table speed according to steel plate, and steel plate is sent into fast and is carried out DQ;
G. after steel plate goes out to control cold unit, send into thermal straightening machine fast and align, aligning speed 2.1m/min;
H. after steel plate goes out straightener, send branch steel stand to divide steel fast to furnace charging table;
I. the naked light tempering stove starts quick shove charge, steel plate is packed into carry out carbon in the stove and distribute, and shove charge speed press 20m/min control, and the tempering furnace temperature is carried out carbon distribution, process speed 15m/min for 180~200 ℃;
J. after the steel plate allocation process finishes, come out of the stove and return slab cold bed air cooling;
K. after steel plate DQ+OP handles, change other tempering stoves when needing tempering over to and carry out tempering.

Claims (2)

1. the production technique of H.T. super-high strength steel and production system, it is characterized in that: process step is:
A. slab heating, 1150~1250 ℃ of Heating temperatures, heating coefficient 8~12min/cm, 1130~1180 ℃ of tapping temperatures;
B. the abundant de-scaling of slab eliminates scale on surface;
C. start rolling temperature is 1050~1100 ℃, guarantees that roughing has the above draft of two passages greater than 15%, and realization high temperature is depressed rolling at a slow speed greatly, 950~970 ℃ of roughing finishing temperatures, and intermediate blank is controlled to be 3~4h;
D. treat warm roller-way treat the temperature 800~860 ℃;
E. the finish rolling start rolling temperature is 800~860 ℃, 780~840 ℃ of finishing temperatures, and steel plate rolls the back and gets into pre-straightening machine aligning;
F. ultrafast cold use DQ pattern, steel plate is gone into 760~830 ℃ of water temps, returns 150~350 ℃ of automatic distribution waters of red temperature and control roller table speed according to steel plate, and steel plate is sent into fast and is carried out DQ;
G. after steel plate goes out to control cold unit, send into thermal straightening machine fast and align, aligning speed is greater than 2m/min;
H. after steel plate goes out straightener, send branch steel stand to divide steel fast to furnace charging table;
I. the naked light tempering stove starts quick shove charge, steel plate is packed into carry out carbon in the stove and distribute, and shove charge speed press 20m/min and controlled, 150~450 ℃ of tempering furnace temperature, process speed 10~60m/min;
J. after the steel plate allocation process finishes, come out of the stove and return slab cold bed air cooling;
K. after steel plate Q+P handles, change other tempering stoves when needing tempering over to and carry out tempering.
2. according to the production technique and the production system of the H.T. super-high strength steel of claim 1, it is characterized in that: apparatus for production line is arranged and is followed successively by: process furnace, slab, De-scaling box; Roughing mill, intermediate blank, finishing mill, pre-straightening machine; Ultrafast cold unit, thermal straightening machine, first fen steel stand, naked light tempering stove; Second fen steel stand, slab cold bed, middle plate cold bed.
CN2011103586552A 2011-11-14 2011-11-14 Production process of high-toughness and ultra-high strength steel and production system thereof Pending CN102337386A (en)

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Cited By (5)

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Publication number Priority date Publication date Assignee Title
CN105369021A (en) * 2015-12-11 2016-03-02 武汉钢铁(集团)公司 On-line quenching and cooling method taking account of shape and performance of thin-specification high-strength steel plate
CN110029268A (en) * 2019-03-27 2019-07-19 江阴兴澄特种钢铁有限公司 A kind of low-temperature pressure container 09MnNiDR steel plate and manufacturing method for protecting center portion low-temperature flexibility
CN110747385A (en) * 2019-11-06 2020-02-04 湖南华菱湘潭钢铁有限公司 Production method of high-toughness and fatigue-resistant Q1100 ultrahigh-strength steel
CN110842033A (en) * 2019-10-22 2020-02-28 首钢集团有限公司 Method and system for improving TMCP steel plate water cooling quality
CN112246910A (en) * 2020-09-15 2021-01-22 首钢集团有限公司 Method for improving performance uniformity of thermomechanically-rolled steel plate and thermomechanically-rolled steel plate

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105369021A (en) * 2015-12-11 2016-03-02 武汉钢铁(集团)公司 On-line quenching and cooling method taking account of shape and performance of thin-specification high-strength steel plate
CN110029268A (en) * 2019-03-27 2019-07-19 江阴兴澄特种钢铁有限公司 A kind of low-temperature pressure container 09MnNiDR steel plate and manufacturing method for protecting center portion low-temperature flexibility
CN110029268B (en) * 2019-03-27 2021-03-26 江阴兴澄特种钢铁有限公司 09MnNiDR steel plate for low-temperature pressure vessel with core low-temperature toughness protection and manufacturing method thereof
CN110842033A (en) * 2019-10-22 2020-02-28 首钢集团有限公司 Method and system for improving TMCP steel plate water cooling quality
CN110747385A (en) * 2019-11-06 2020-02-04 湖南华菱湘潭钢铁有限公司 Production method of high-toughness and fatigue-resistant Q1100 ultrahigh-strength steel
CN112246910A (en) * 2020-09-15 2021-01-22 首钢集团有限公司 Method for improving performance uniformity of thermomechanically-rolled steel plate and thermomechanically-rolled steel plate

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Application publication date: 20120201