CN101844162A - Method for removing residual stress of hot-rolling high-strength steel - Google Patents
Method for removing residual stress of hot-rolling high-strength steel Download PDFInfo
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Abstract
The invention relates to a method for removing residual stress of hot-rolling high-strength steel, which comprises the production flows of: (1) putting a steel coil of which the thickness is more than or equal to 8 millimeters into a slow cooling pit for slow cooling treatment; and (2) performing air cooling on a steel coil of which the thickness is less than 8 millimeters, and after the steel coil is cooled to reach room temperature, performing temper rolling and performing reeling again to form a coil. A roller-type straightening unit is adopted to perform straightening, flattening, dimensioning and cross-cut on the treated high-strength steel coil to form a steel plate. A roller-hearth heat treatment furnace is adopted to perform stress relief annealing on the flattened steel plate, so that the internal stress of the steel plate is eliminated; and after being tapped off, the steel plate is cooled slowly by adopting a stacking cooling mode, and finally the steel plate is straightened by using the straightening unit, so that the high-strength steel plate has the excellent plate shape stability and can meet the strict requirements of users on flatness of less than or equal to 2 mm/m of the high-strength steel plate. The conventional heat treatment furnace and roller-type straightening equipment can be utilized, so that the investment cost and machining cost are reduced, the annealing treatment time is shortened, and the effect of the plate shape improvement of hood-type annealing is achieved. Thus, the method has an important economic and social significance for the development of the high-strength steel.
Description
Technical field
The invention belongs to steel processing method technical field, relate to hot-rolling high-strength steel plate method for removing residual stress, be specially adapted to eliminate the residual stress that hot-rolling high-strength steel produces in rolling and cooling procedure, and finally satisfy the strip shape quality requirement that the high-strength steel user uses.
Background technology
The hot rolling engineering machinery is to produce with the coil of strip form with high-strength steel and auto truck beam etc., and need aligning also when the user uses, crosscut becomes steel plate.Plate shape is a more and more higher quality index of customer requirements, postpones to produce, damages problems such as process equipment, welding difficulty when serious flatness defect may cause the user to use.Need the plate shape of final coiled sheet be controlled, the product that offers the user has high-quality plate shape.The high reinforcement trend of the steel that use on the engineering is more and more obvious, and consumption is also continuing increase.The band hardness of steel is high more, and the internal stress of band steel can be big more, opens flat process and use after causing rolling and the above high-strength steel of big distortion, especially 600MPa rank occurs, need carry out eliminating residual stress from the method for machining and combined with heat treatment.
Residual stress is the stress that is present in component inside and keeps balance in whole member inside under the situation of no any service load effect.The hot rolling high strength band steel rolling, open in the technologies such as flat, heat treatment and all may produce residual stress.It on the hot-strip internal residual stress question essence plate shape problem.
The user is desired, and what obtain is that internal stress evenly distributes or internal stress free the band steel that plate shape is good.The strip shape quality that improves hot-strip can reduce the additional process of bringing owing to deformation in the use of band steel, enhances productivity and lumber recovery.Solve strip produce in residual stress problems be one and have the tremendous economic meaning and have very important social effect.
Hot continuous rolling is produced high-strength plate production procedure key step: continuous casting steel billet heating → thick de-scaling → Fixed width forcing press → roughing → flying shear crop end → smart de-scaling → finish rolling (6 to 7 frame four-high mill) → rolling the back laminar flow cools off → coils into coil of strip.Plate shape control in the operation of rolling is that the optimization of controlling technical process such as model, rolling temperature, reasonable sharing of load by roll forming design, secondary guarantees.Roll in the cooling procedure of back because the influence of transverse temperature distributing homogeneity and cooldown rate, plate shape also can change.In addition, to enter coiling machine after the TEMPERATURE FOR HOT STRIP LAMINAR cooling and be rolled into coil of strip, cause producing in the strip coiling process additional buckling deformation internal stress.Patent 200510110981.6 has provided a kind of method of testing of hot continuous rolling high strength steel plate residual stress, sets for straightening process and does reference and guidance.The user adopts the roll straightening unit that hot-rolled sheet coil is carried out leveling, crosscut scale.Scroll that roll-type leveling technology causes difference in length and horizontal sinus fall into has the elimination effect, and type flaws such as opposite side wave, middle wave, camber and wooden dipper song can not be accomplished to eliminate completely.Stretch bending-straightening machine or smooth unit are good instruments eliminating above-mentioned two class flatness defects, but also just in the cold rolled strip steel production process, use in a large number at present, relate to patent smooth or straightening technology as number of patent application 200620092768.7,200510024681.6 etc.Number of patent application 200910093663.1 is walked the process route of skin pass rolling → bell-type annealing → roll straightening after having determined to roll, and has obtained good effect.But, because plate shapes such as cold-rolled products such as the hot rolling acid-cleaning plate of thin specification, thin specification container plate, high-strength steel and tin plate are restive, all need carry out skin pass rolling, this has brought huge pressure for the production of planisher, is difficult to finish the smooth task of all steel grades.Simultaneously, the investment amount of bell type annealing furnace is also bigger, and cost of investment is higher, so need the product to hot-rolling high-strength steel, especially thick specification product is eliminated the residual stress process route and improved.
Summary of the invention
The object of the present invention is to provide a kind of method for removing residual stress of hot-rolling high-strength steel, eliminate the residual stress of the high-strength steel coiled sheet of producing with even wide steel strip hot continuous rolling production line, make the hot continuous rolling high strength steel plate have the high accuracy strip shape quality, satisfy user's instructions for use.
Technical solution of the present invention is:
A kind of method for removing residual stress of hot-rolling high-strength steel, production procedure may further comprise the steps: continuous casting steel billet heating → thick de-scaling → Fixed width forcing press → roughing → flying shear crop end → smart de-scaling → finish rolling (6 frames or 7 frame four-high mills) → laminar flow cools off → coils into coil of strip, it is characterized in that:
(1) coil of strip to thickness specification 〉=8mm carries out the slow cooling processing earlier, is cooled to temperature and is lower than 100 ℃; Coil of strip elder generation air cooling to thickness specification＜8mm arrives room temperature, carries out skin pass rolling processing again, coils into coil of strip again;
(2) adopt roll leveller that the hot-rolling high-strength steel of above-mentioned processing is involved in row and open flat, scale and crosscut;
(3) adopt roller hearth heat-treated furnace, the steel plate of splitting after putting down carries out annealing in process, and the back of coming out of the stove adopts the stacking type of cooling to carry out slow cooling, carries out leveling at last on roll leveller.
The roller hearth heat-treated furnace annealing process procedure as shown in Figure 2, concrete parameter is as follows:
Furnace gas environment: nitrogen
Temperature homogeneity in the stove: ± 5 ℃
Annealing temperature (T1) scope: 520～560 ℃
Heating-up time (t1): 30～100 minutes
Temperature retention time (t2): 100～150 minutes
Cool time (t3): greater than 1500 minutes
The type of cooling: stacking cooling.
Technique effect of the present invention:
The high reinforcement trend of the steel that use on the engineering is more and more obvious, and consumption is also in sustainable growth.The band hardness of steel is high more, and the residual stress of band steel can be big more, opens flat process and use after causing rolling and big distortion occurs.To hot-rolling high-strength steel coiled sheet product, especially for the product of yield strength greater than 600MPa, adopt technical solution of the present invention, high-strength steel is carried out residual stress elimination and homogenising processing, effect is remarkable, this technological process can significantly improve the strip shape quality of high-strength steel opening plate, and makes the user obtain good plate shape stability.Residual stress control level can compare favourably with similar external imported product, substitutes import, has realized high-strength steel Products Development target.Simultaneously, can utilize existing heat-treatment furnace and roll straightening equipment, specially whole winding steel is not carried out the bell type annealing furnace that stress relief annealing is handled and do not need reinvestment in addition to build, cost of investment and processing cost have been reduced, shortened the annealing in process time, and the same plate shape that can reach bell-type annealing improves effect, for the exploitation of high-strength steel, import substitutes have important economy and social effect.
Description of drawings
Fig. 1 is a process chart of eliminating hot continuous rolling high-strength steel flatness defect;
Fig. 2 is a roller hearth heat-treated furnace stress relief annealing artwork;
Among Fig. 2: t represents the time, and T is a temperature
Fig. 3 is that rolling specs is 6 * 1400mm and 8 * 1500mm (thickness * width) SQ600MCC,
Adopt plate shape measurement comparative result figure behind 4 kinds of different process routes.
Among Fig. 3: T represents to be with the horizontal unevenness of steel in the abscissa, and L represents vertical unevenness, and C represents camber, and ordinate Y represents the numerical value of unevenness or camber, and unit is mm; Curve 1: process route is that rolling → air cooling → aligning is opened flat (6mm thickness), curve 2: process route is that rolling → air cooling → aligning is opened flat (8mm thickness), curve 3: process route is that rolling → slow cooling → aligning is opened flat (6mm thickness), curve 4: process route is that rolling → slow cooling → aligning is opened flat (8mm thickness), curve 5: process route of the present invention is that rolling → slow cooling → roll straightening unit aligning is opened flat → scale and crosscut steel plate → roller hearth heat-treated furnace annealing → cooling in heap → roll straightening (8mm thickness), curve 6: process route of the present invention is that rolling → air cooling → skin pass rolling → rewinding → roll straightening unit aligning opens flat → scale and crosscut becomes steel plate → roller hearth heat-treated furnace annealing → cooling in heap → roll straightening (6mm thickness)
The specific embodiment
In the process of Shoudu Iron and Steel Co hot-rolling high-strength steel coiled sheet exploitation, especially for the higher engineering machinery products such as steel and auto truck beam of intensity, the user is to the use plate shape of band steel, and just the requirement of residual stress is very high.The residual stress that high-strength steel exists mainly is because the operation of rolling and the cooling procedure of hot continuous rolling wide flat steel exist heterogeneity conditions such as temperature, phase transformation to cause.In order to guarantee the smooth exploitation of hot-rolling high-strength steel product, particularly for the product of yield strength rank more than or equal to 600MPa, need eliminate with homogenising the residual stress of the coil of strip inside after the hot rolling and handle, guarantee the good profile quality the when user uses.Although can adopt smoothing and rolling process to improve the belt plate shape quality, but all need to carry out skin pass rolling owing to approach cold-rolled products, hot rolling acid-cleaning plate, the restive and demanding kinds of plate shape such as thin specification container plate, high-strength steel and tin plate of specification, improve the belt plate shape quality, this has brought huge pressure for the production of planisher, is difficult to finish the smooth task of all steel grades.So, especially carry out different process route designs according to different thick specification products to the product of high-strength steel.
Move on the steel 2250mm hot continuous rolling production line at Shoudu Iron and Steel Co and to have carried out the rolling of SQ600MCC, specification is two kinds of 6 * 1400mm and 8 * 1500mm (thickness * width), comprises that the various rolling conditions of temperature, reduction system etc. are all consistent.Concrete milled sheet shape situation is also approaching: all be that head has 100 to 300IU middle unrestrained plate shape when rolling, follow-up is little limit wave plate shape.
To rolling intact coil of strip, adopt following processing step:
(1) rolling back → burial pit slow cooling (8.0mm thickness specification) → roll straightening unit aligning is opened flat → scale and crosscut and is become that steel plate → sending into roller hearth heat-treated furnace carries out annealing in process (medium plate mill) → stacking cooling → roll straightening (medium plate mill) → plate shape measurement
(2) rolling back → air cooling (6.0mm thickness specification) → skin pass rolling → rewinding rolling → roll straightening unit aligning is opened flat → scale and crosscut and is become that steel plate → sending into roller hearth heat-treated furnace carries out annealing in process (medium plate mill) → stacking cooling → roll straightening (medium plate mill) → plate shape measurement
Parameter in the associated process steps is set:
1) holding pit retarded cooling process parameter: advancing to cheat temperature is 520～550 ℃, and slow cooling goes out holding pit after being lower than 100 ℃.
2) the concrete parameter of formation process is set:
Tension force is set: forward pull 30MPa, backward pull 10MPa
Percentage elongation: 1.0%
Roll-force: 320t
Bending roller force :-40t
3) 9 straighteners are opened flat processing parameter setting:
Inlet nip: 7mm
Outlet nip: 17mm
4) LOI roller hearth heat-treated furnace and parameter and annealing thereof are set:
Furnace gas environment: nitrogen
Temperature homogeneity in the stove: ± 5 ℃
Annealing temperature (T1) scope: 550 ℃
Heating-up time (t1): 40 minutes
Temperature retention time (t2): 120 minutes
Cool time (t3): greater than 1500 minutes
The type of cooling: stacking cooling.
Enter the stokehold in test with high strength steel plate, an advanced length heats greater than the steel plate of 1500mm greater than 9m, width, uses as place mat; Several planks are superimposed respectively, go into stove as a slab integral body; Follow backing plate, advance heat-treatment furnace; The most laggard stove one block length greater than 9m, width greater than the slab of 1500mm as cover plate.
5) plate straightener pattern and technological parameter thereof in:
Straightener pattern: quadruple 11 rollers
Smoothing roll number: 11
Upper straightening roll number: 5
Following smoothing roll number: 6
The smoothing roll specification:
Smoothing roll roll spacing: 280～300mm
Backing roll specification: φ 260～320 * 400mm (segmentation)
Straightener roll gap processing parameter setting:
Inlet nip: 6mm
Outlet nip: 14mm
The sample of being got is carried out initial plate shape measurement, mainly comprise width and length direction unevenness, also have camber, and carry out record.Adopt process route of the present invention and rollingly intact carry out plate shape measurement result that the gentle cold back of air cooling aligning opens flat process route respectively relatively, as shown in Figure 3, therefrom as can be seen, rolling back → 8.0mm thickness specification is gone into burial pit slow cooling/(6.0mm thickness specification air cooling → skin pass rolling → rewinding rolling) → roll straightening unit aligning and is opened the strip shape quality that process route that flat → scale and crosscut become steel plate → send into roller hearth heat-treated furnace to carry out annealing in process → stacking cooling → roll straightening can satisfy the 2mm/m of end user's requirement.Adopt this technical process, can thoroughly eliminate the internal stress of hot continuous rolling high-strength steel coiled sheet, make and adopt the high strength steel plate of this explained hereafter to have stable smooth strip shape quality, satisfy the requirement of user's high accuracy strip shape quality.The hot continuous rolling high-strength steel adopts this technology to roll back processing, can realize the production and the supply of material of the steel plate of high-quality strip shape quality in batches, and because the solution of plate shape problem, lumber recovery is improved, and user feedback is good, remarkable benefit.
Claims (2)
1. method for removing residual stress of hot-rolling high-strength steel, production procedure may further comprise the steps: continuous casting steel billet heating → thick de-scaling → Fixed width forcing press → roughing → flying shear crop end → smart de-scaling → finish rolling → laminar flow cools off → coils into coil of strip, it is characterized in that:
(1) coil of strip to thickness specification 〉=8mm carries out the slow cooling processing earlier, is cooled to temperature and is lower than 100 ℃; Coil of strip elder generation air cooling to thickness specification＜8mm arrives room temperature, carries out skin pass rolling processing again, coils into coil of strip again;
(2) adopt roll leveller that the hot-rolling high-strength steel of above-mentioned processing is involved in row and open flat, scale and crosscut;
(3) adopt roller hearth heat-treated furnace, the steel plate of splitting after putting down carries out annealing in process, and the back of coming out of the stove adopts the stacking type of cooling to carry out slow cooling, carries out leveling at last on roll leveller.
2. strip shape of hot-rolled high-strength steel control method according to claim 1 is characterized in that, the roller hearth heat-treated furnace parameter and annealing:
Furnace gas environment: nitrogen
Temperature homogeneity in the stove: ± 5 ℃
Annealing temperature (T1) scope: 520～560 ℃
Heating-up time (t1): 30～100 minutes
Temperature retention time (t2): 100～150 minutes
Cool time (t3): greater than 1500 minutes
The type of cooling: stacking cooling.
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102489961A (en) * | 2011-12-13 | 2012-06-13 | 西南铝业（集团）有限责任公司 | Method for producing high-purity aluminum-based composite board |
| CN102864295A (en) * | 2012-10-08 | 2013-01-09 | 武汉钢铁(集团)公司 | Method for eliminating stress of sheet steel with structure of tensile strength larger than or equal to 785 MPa |
| CN104056863A (en) * | 2013-09-06 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-rolled steel plate and preparation method thereof |
| CN105880650A (en) * | 2015-09-09 | 2016-08-24 | 广东技术师范学院 | Heating cutting device capable of decreasing residual stress |
| CN107695096A (en) * | 2017-11-23 | 2018-02-16 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method for improving hot rolled plate plate shape |
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| CN109252027A (en) * | 2017-07-13 | 2019-01-22 | 安徽宏源铁塔有限公司 | The processing method of the low weather-proof bending angle steel of residual stress |
| CN109465295A (en) * | 2018-08-06 | 2019-03-15 | 首钢集团有限公司 | A method of preventing hot continuous-milling steel plate brisement band in side in cold rolling |
| CN110038898A (en) * | 2019-04-10 | 2019-07-23 | 鞍钢股份有限公司 | A kind of 1500MPa grades of thermoforming high-strength steel production technology |
| CN110918652A (en) * | 2019-10-30 | 2020-03-27 | 鞍钢股份有限公司 | Production method for improving internal stress of high-strength hot-rolled strip steel at low cost |
| CN111546069A (en) * | 2020-05-11 | 2020-08-18 | 江苏联峰实业有限公司 | Residual stress eliminating method for hot-rolled high-strength steel |
| BE1027270B1 (en) * | 2019-10-30 | 2020-12-07 | Saey Nv | PROCESS FOR THE PRODUCTION OF FLAT STEEL PLATES |
| CN112176251A (en) * | 2020-09-21 | 2021-01-05 | 湖北工业大学 | 850 MPa-grade high-strength magnetic yoke steel plate with low internal stress and manufacturing method thereof |
| CN113996674A (en) * | 2021-09-16 | 2022-02-01 | 江苏沙钢集团有限公司 | Method for controlling plate shape of hot-rolled wide high-strength steel plate |
| CN114682642A (en) * | 2022-03-30 | 2022-07-01 | 鞍钢股份有限公司 | Production method of high-plate-shape-quality thin-specification high-strength hot continuous rolling wear-resistant steel plate |
| CN114990304A (en) * | 2022-06-06 | 2022-09-02 | 武汉科技大学 | Intrinsic strain reconstruction and quenching residual stress control method based on stress control |
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| CN102489961A (en) * | 2011-12-13 | 2012-06-13 | 西南铝业（集团）有限责任公司 | Method for producing high-purity aluminum-based composite board |
| CN102864295A (en) * | 2012-10-08 | 2013-01-09 | 武汉钢铁(集团)公司 | Method for eliminating stress of sheet steel with structure of tensile strength larger than or equal to 785 MPa |
| CN102864295B (en) * | 2012-10-08 | 2014-06-18 | 武汉钢铁(集团)公司 | Method for eliminating stress of sheet steel with structure of tensile strength larger than or equal to 785 MPa |
| CN104056863A (en) * | 2013-09-06 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-rolled steel plate and preparation method thereof |
| CN104056863B (en) * | 2013-09-06 | 2016-08-31 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of hot rolled steel plate and preparation method thereof |
| CN105880650B (en) * | 2015-09-09 | 2018-09-18 | 广东技术师范学院 | A kind of hot machining device reducing residual stress |
| CN105880650A (en) * | 2015-09-09 | 2016-08-24 | 广东技术师范学院 | Heating cutting device capable of decreasing residual stress |
| CN109252027A (en) * | 2017-07-13 | 2019-01-22 | 安徽宏源铁塔有限公司 | The processing method of the low weather-proof bending angle steel of residual stress |
| CN107695096A (en) * | 2017-11-23 | 2018-02-16 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method for improving hot rolled plate plate shape |
| CN108889778A (en) * | 2018-06-25 | 2018-11-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Control the milling method of high tensile hot rolled steel sheet residual stress |
| CN109465295B (en) * | 2018-08-06 | 2020-06-09 | 首钢集团有限公司 | Method for preventing edge cracking and strip breakage of hot continuous rolled steel plate in cold rolling |
| CN109465295A (en) * | 2018-08-06 | 2019-03-15 | 首钢集团有限公司 | A method of preventing hot continuous-milling steel plate brisement band in side in cold rolling |
| CN110038898A (en) * | 2019-04-10 | 2019-07-23 | 鞍钢股份有限公司 | A kind of 1500MPa grades of thermoforming high-strength steel production technology |
| CN110918652A (en) * | 2019-10-30 | 2020-03-27 | 鞍钢股份有限公司 | Production method for improving internal stress of high-strength hot-rolled strip steel at low cost |
| BE1027270B1 (en) * | 2019-10-30 | 2020-12-07 | Saey Nv | PROCESS FOR THE PRODUCTION OF FLAT STEEL PLATES |
| EP3816307A3 (en) * | 2019-10-30 | 2021-06-23 | Saey NV | Method for production of flat steel plates |
| CN111546069A (en) * | 2020-05-11 | 2020-08-18 | 江苏联峰实业有限公司 | Residual stress eliminating method for hot-rolled high-strength steel |
| CN111546069B (en) * | 2020-05-11 | 2021-06-29 | 江苏联峰实业有限公司 | Residual stress eliminating method for hot-rolled high-strength steel |
| CN112176251A (en) * | 2020-09-21 | 2021-01-05 | 湖北工业大学 | 850 MPa-grade high-strength magnetic yoke steel plate with low internal stress and manufacturing method thereof |
| CN113996674A (en) * | 2021-09-16 | 2022-02-01 | 江苏沙钢集团有限公司 | Method for controlling plate shape of hot-rolled wide high-strength steel plate |
| CN114682642A (en) * | 2022-03-30 | 2022-07-01 | 鞍钢股份有限公司 | Production method of high-plate-shape-quality thin-specification high-strength hot continuous rolling wear-resistant steel plate |
| CN114682642B (en) * | 2022-03-30 | 2023-09-26 | 鞍钢股份有限公司 | Production method of high-plate-shape quality thin-specification high-strength hot continuous rolling wear-resistant steel plate |
| CN114990304A (en) * | 2022-06-06 | 2022-09-02 | 武汉科技大学 | Intrinsic strain reconstruction and quenching residual stress control method based on stress control |
| CN114990304B (en) * | 2022-06-06 | 2024-02-13 | 武汉科技大学 | Intrinsic strain reconstruction and quenching residual stress control method based on stress control |
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