CN105251779B - A kind of hot rolling acid-cleaning plate surface oxidation point defects controlling method - Google Patents
A kind of hot rolling acid-cleaning plate surface oxidation point defects controlling method Download PDFInfo
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- CN105251779B CN105251779B CN201510698142.4A CN201510698142A CN105251779B CN 105251779 B CN105251779 B CN 105251779B CN 201510698142 A CN201510698142 A CN 201510698142A CN 105251779 B CN105251779 B CN 105251779B
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- hot rolling
- cleaning plate
- steel billet
- rolling acid
- finishing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/30—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control
- B21B37/32—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control by cooling, heating or lubricating the rolls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The present invention relates to hot rolling technique fields, in particular to a kind of hot rolling acid-cleaning plate surface oxidation point defects controlling method, include: control steel billet chemical component contain Si:0.05~0.15%, P≤0.01% by percentage to the quality, remaining be Mn, Nb, Ti and Fe matrix；During heating steel billet, it will be placed in 160~200min of heating in heating furnace with a thickness of the steel billet of 135~250mm, the tapping temperature for controlling steel billet is 1180~1240 DEG C；Control the intermediate base of gained after de-scaling process with a thickness of 26~34mm；In finishing stands, control entry temperature at finishing is 980~1020 DEG C, and control finishing temperature is 850~890 DEG C.The generation of thickness≤2mm, tensile strength >=500MPa hot rolling acid-cleaning plate surface oxidation point defect can be effectively suppressed in hot rolling acid-cleaning plate surface oxidation point defects controlling method provided by the invention.
Description
Technical field
The present invention relates to hot rolling technique field, in particular to a kind of hot rolling acid-cleaning plate surface oxidation point defects controlling side
Method.
Background technique
Hot rolling acid-cleaning plate is the intermediate product between cold rolling and hot rolling, it has the surface quality close to cold plate, simultaneously
The mechanical property of hot-rolled product is remain, application range is very extensive.Hot rolling acid-cleaning plate is imitated so that its higher sexual valence is when economical
Benefit has preferable market prospects.
It is vehicle structure steel used in the processing industry of representative just towards high strengthening, the trend of thin gauge using automobile industry
Development.Thickness≤2mm, tensile strength >=500MPa hot rolling acid-cleaning plate demand are increasing, which has specification
The defects of feature thin, intensity is high, product surface is not allow for point, concave surface of the depth no more than steel plate thickness tolerance half.
Find in actual production, thickness≤2mm, tensile strength >=500MPa hot rolling acid-cleaning plate surface quality it is main
Defect is scale mark, such defect has seriously affected the apparent mass and punching performance of finished product.Currently, not yet occur thickness≤
The control method of 2mm, tensile strength >=500MPa hot rolling acid-cleaning plate scale mark.
Summary of the invention
The embodiment of the present invention solves existing by providing a kind of hot rolling acid-cleaning plate surface oxidation point defects controlling method
There is the technical issues of thickness≤2mm in technology, tensile strength >=500MPa hot rolling acid-cleaning plate are easy to appear scale mark defect,
The occurrence probability for reducing scale mark defect on hot rolling acid-cleaning plate improves the final product quality of hot rolling acid-cleaning plate.
The embodiment of the invention provides a kind of hot rolling acid-cleaning plate surface oxidation point defects controlling method, the hot rolling acid
Thickness≤2mm of board-washing, tensile strength >=500MPa, the manufacturing process of the hot rolling acid-cleaning plate be followed successively by heating steel billet, roughing,
De-scaling, finish rolling and pickling, which comprises
The chemical component for controlling the steel billet contains Si:0.05~0.15%, P≤0.01% by percentage to the quality,
Remaining is Mn, Nb, Ti and Fe matrix.
During the heating steel billet, will be placed in heating furnace with a thickness of the steel billet of 135~250mm heating 160~
200min, the tapping temperature for controlling the steel billet is 1180~1240 DEG C.
Control the intermediate base of gained after de-scaling process with a thickness of 26~34mm.
In the finishing stands, control entry temperature at finishing is 980~1020 DEG C, and control finishing temperature is 850~890
℃。
Further, further includes: in the rough rolling process, five passes are carried out to the steel billet.
Further, further includes: during the de-scaling, the steel billet is carried out at least three passage high-pressure water descalings
Reason.
Further, further includes: in the finishing stands, first three rack of finishing mill roll uses high-speed steel roll,
It is 50% that cooling water nozzle between first three rack of the finishing mill roll, which opens ratio, and opens the anti-peeling water of roll.
One or more technical solutions provided in an embodiment of the present invention, at least have following beneficial effect or advantage:
1, hot rolling acid-cleaning plate surface oxidation point defects controlling method provided in an embodiment of the present invention passes through control Si's
Mass percent is the mass percent of 0.05~0.15%, P less than 0.01%, increases iron scale and basal body binding force,
To reduce the occurrence probability of hot rolling surface scale mark defect.The embodiment of the present invention is by existing the thickness control of intermediate base
26~34mm reduces the roll rolling load of finishing stands；Tapping temperature by controlling steel billet is 1180~1240 DEG C, can
With the homogeneity question of effective solution iron scale and substrate contact face；Controlling entry temperature at finishing control is 980~1020
DEG C, finishing temperature be 850~890 DEG C, the oxidation film of work roll surface can be reduced by the risk that cyclic thermal stres act on and peel off；
By the above technological means, thickness≤2mm, intensity >=500MPa hot rolling acid-cleaning plate surface oxidation point defect can be effectively suppressed
Occur, improves the quality of hot rolling acid-cleaning plate.
2, hot rolling acid-cleaning plate surface oxidation point defects controlling method provided in an embodiment of the present invention, before rolling mill roll
Three racks use high-speed steel roll, and high-speed steel roll wearability is 3 times or more of rich chromium cast iron, will not be because of roll spalling of oxide film
And lead to scale mark defect occur, roll surface quality is effectively guaranteed.
Detailed description of the invention
Fig. 1 is hot rolling acid-cleaning plate surface oxidation point defects controlling method flow diagram provided in an embodiment of the present invention.
Specific embodiment
The embodiment of the present invention solves existing by providing a kind of hot rolling acid-cleaning plate surface oxidation point defects controlling method
There is the technical issues of thickness≤2mm in technology, tensile strength >=500MPa hot rolling acid-cleaning plate are easy to appear scale mark defect,
The occurrence probability for reducing scale mark defect on hot rolling acid-cleaning plate improves the final product quality of hot rolling acid-cleaning plate.
The embodiment of the invention provides a kind of hot rolling acid-cleaning plate surface oxidation point defects controlling method, the hot rolling acid
Thickness≤2mm of board-washing, tensile strength >=500MPa, the manufacturing process of hot rolling acid-cleaning plate are followed successively by heating steel billet, roughing, remove
Squama, finish rolling and pickling.
Referring to Fig. 1, which comprises
Step 10, the chemical component for controlling steel billet contain Si:0.05~0.15%, P≤0.01% by percentage to the quality,
Remaining is Mn, Nb, Ti and Fe matrix.The mass percent that mass percent by controlling Si is 0.05~0.15%, P is less than
0.01%, increase iron scale and basal body binding force, to reduce the probability of hot rolling surface scale mark.
Step 20, during heating steel billet, will be placed in heating furnace with a thickness of the steel billet of 135~250mm heating 160~
200min, the tapping temperature for controlling steel billet is 1180~1240 DEG C.The tapping temperature for controlling steel billet is 1180~1240 DEG C, is used for
Solve the problems, such as that the uniformity in iron scale and substrate contact face is uneven.
Step 30, in rough rolling process, to steel billet carry out five passes.
Step 40, during de-scaling, to steel billet carry out at least three passage high-pressure water descalings processing, control de-scaling process after
Base with a thickness of 26~34mm among gained.By the thickness control of intermediate base in 26~34mm, reduce the roll of finishing stands
Rolling load.
Step 50, in finishing stands, control entry temperature at finishing be 980~1020 DEG C, control finishing temperature be 850~
890℃.Controlling entry temperature at finishing and controlling is 980~1020 DEG C, finishing temperature is 850~890 DEG C, for preventing working roll table
The oxidation film in face is acted on by cyclic thermal stres and is peeled off.
Step 60, in finishing stands, first three rack of finishing mill roll uses high-speed steel roll, before finishing mill roll
It is 50% that cooling water nozzle between three racks, which opens ratio, and opens the anti-peeling water of roll.High-speed steel roll wearability is height
3 times or more of chrome cast iron will not lead to scale mark defect occur because of roll spalling of oxide film, ensure that roll surface quality.
Embodiment 1
Present embodiments provide a kind of hot rolling acid-cleaning plate surface oxidation point defects controlling method, the hot rolling acid-cleaning plate
Thickness≤2mm, tensile strength >=500MPa, the manufacturing process of hot rolling acid-cleaning plate is followed successively by heating steel billet, roughing, de-scaling, essence
It rolls and pickling.This method comprises:
Control steel billet chemical component contain Si:0.06%, P:0.008% by percentage to the quality, remaining for Mn, Nb,
Ti and Fe matrix.It will be put into heating stove heating 160min with a thickness of the steel billet of 200mm, controlling the steel billet temperature come out of the stove is 1200
DEG C, and the steel billet come out of the stove is subjected to roughing and high pressure descaling water de-scaling processing, the steel billet come out of the stove on singlestandmill by executing
Reciprocating 5 passage roughing operation, 3 passage of high pressure descaling water de-scaling, such as 1,3 and 5 passages can be opened and carry out high pressure descaling water
De-scaling is except processing, to obtain the intermediate base with a thickness of 26mm.Then intermediate base is passed through after flying shear and smart de-scaling processing
Hot-tandem unit carries out finish rolling processing, and entry temperature at finishing is controlled at 980 DEG C, and finishing temperature control is at 850 DEG C, finish rolling
First three rack of finishing mill roll uses high-speed steel roll, and the roll surface grading of high-speed steel roll Wei not level-one.
Embodiment 2
Present embodiments provide a kind of hot rolling acid-cleaning plate surface oxidation point defects controlling method, the hot rolling acid-cleaning plate
Thickness≤2mm, tensile strength >=500MPa, the manufacturing process of hot rolling acid-cleaning plate is followed successively by heating steel billet, roughing, de-scaling, essence
It rolls and pickling.This method comprises:
The chemical component of control steel billet contains Si:0.1%, P:0.006% by percentage to the quality, remaining is Mn, Nb, Ti
And Fe matrix.It will be put into heating stove heating 160min with a thickness of the steel billet of 200mm, controlling the steel billet temperature come out of the stove is 1200 DEG C,
And the steel billet come out of the stove is subjected to roughing and high pressure descaling water de-scaling processing, the steel billet come out of the stove is reciprocal by executing on singlestandmill
5 passage roughing operation of formula, 3 passage of high pressure descaling water de-scaling, such as 1,3 and 5 passages can be opened and carry out the de-scaling of high pressure descaling water
Except processing, to obtain the intermediate base with a thickness of 32mm.Then by intermediate base after flying shear and smart de-scaling processing, even by heat
It rolls mm finishing mill unit and carries out finish rolling processing, at 1000 DEG C, finishing temperature control is smart at 870 DEG C, finish rolling for entry temperature at finishing control
First three rack of rolling mill roll uses high-speed steel roll, and the roll surface grading of high-speed steel roll Wei not level-one.
The embodiment of the present invention provides hot rolling acid-cleaning plate surface oxidation point defects controlling method, at least has following beneficial
Effect:
Hot rolling acid-cleaning plate surface oxidation point defects controlling method provided in an embodiment of the present invention, by the matter for controlling Si
Measuring percentage is the mass percent of 0.05~0.15%, P less than 0.01%, increases iron scale and basal body binding force, from
And reduce the occurrence probability of hot rolling surface scale mark defect.The embodiment of the present invention by by the thickness control of intermediate base 26
~34mm reduces the roll rolling load of finishing stands；Tapping temperature by controlling steel billet is 1180~1240 DEG C, can be with
The homogeneity question of effective solution iron scale and substrate contact face；Control entry temperature at finishing control for 980~1020 DEG C,
Finishing temperature is 850~890 DEG C, can reduce the risk that the oxidation film of work roll surface is peeled off by cyclic thermal stres effect；It is logical
The above technological means is crossed, thickness≤2mm, intensity >=500MPa hot rolling acid-cleaning plate surface oxidation point defect hair can be effectively suppressed
It is raw, improve the quality of hot rolling acid-cleaning plate.
Hot rolling acid-cleaning plate surface oxidation point defects controlling method provided in an embodiment of the present invention, rolling mill roll first three
Rack uses high-speed steel roll, and high-speed steel roll wearability is 3 times or more of rich chromium cast iron, will not be due to roll spalling of oxide film
Lead to scale mark defect occur, roll surface quality is effectively guaranteed.
It should be noted last that the above specific embodiment is only used to illustrate the technical scheme of the present invention and not to limit it,
Although being described the invention in detail referring to example, those skilled in the art should understand that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit and scope of the technical solution of the present invention, should all cover
In the scope of the claims of the present invention.
Claims (3)
1. a kind of hot rolling acid-cleaning plate surface oxidation point defects controlling method, which is characterized in that the thickness of the hot rolling acid-cleaning plate
Degree≤2mm, tensile strength >=500MPa, the manufacturing process of the hot rolling acid-cleaning plate are followed successively by heating steel billet, roughing, de-scaling, essence
It rolls and pickling, which comprises
The chemical component for controlling the steel billet contains Si:0.06%, P 0.008% by percentage to the quality, remaining for Mn, Nb,
Ti and Fe matrix；
During the heating steel billet, it will be placed in 160~200min of heating in heating furnace with a thickness of the steel billet of 135~250mm,
The tapping temperature for controlling the steel billet is 1200~1240 DEG C；
Control the intermediate base of gained after de-scaling process with a thickness of 26~34mm；
In the finishing stands, control entry temperature at finishing is 980~1020 DEG C, and control finishing temperature is 850~890 DEG C；
Wherein, in the finishing stands, first three rack of finishing mill roll uses high-speed steel roll, the finishing mill roll
It is 50% that cooling water nozzle between first three rack, which opens ratio, and opens the anti-peeling water of roll.
2. hot rolling acid-cleaning plate surface oxidation point defects controlling method as described in claim 1, which is characterized in that also wrap
It includes: in the rough rolling process, five passes being carried out to the steel billet.
3. hot rolling acid-cleaning plate surface oxidation point defects controlling method as claimed in claim 2, which is characterized in that also wrap
It includes: during the de-scaling, the processing of at least three passage high-pressure water descalings being carried out to the steel billet.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510698142.4A CN105251779B (en) | 2015-10-23 | 2015-10-23 | A kind of hot rolling acid-cleaning plate surface oxidation point defects controlling method |
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| CN201510698142.4A CN105251779B (en) | 2015-10-23 | 2015-10-23 | A kind of hot rolling acid-cleaning plate surface oxidation point defects controlling method |
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| CN105251779A CN105251779A (en) | 2016-01-20 |
| CN105251779B true CN105251779B (en) | 2018-12-14 |
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| CN107052060B (en) * | 2017-04-07 | 2019-08-23 | 首钢集团有限公司 | A method of eliminating acid-cleaning plate Pinhole-shaped point defect |
| CN108817080A (en) * | 2018-04-03 | 2018-11-16 | 宁波钢铁有限公司 | A kind of method that hot rolling acid-cleaning is controlled with steel surface quality |
| CN109226258B (en) * | 2018-09-05 | 2020-10-09 | 湖南华菱涟源钢铁有限公司 | Method for preventing medium-high carbon hot-rolled strip steel from generating roll marks |
| CN110479774B (en) * | 2019-08-13 | 2021-01-08 | 武汉钢铁有限公司 | Method for eliminating pit defect on surface of thin hot-rolled pickled steel |
| CN111659734B (en) * | 2020-06-09 | 2022-03-22 | 首钢集团有限公司 | Control method for surface pockmark defects of thin pickled plate |
| CN111695271B (en) * | 2020-06-29 | 2023-07-25 | 武汉钢铁有限公司 | Tracking method of steel billet surface metal in plastic deformation |
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| CN101704026B (en) * | 2009-12-03 | 2011-07-20 | 南京钢铁股份有限公司 | Method for controlling pitting on surface of medium steel plate |
| CN101856669B (en) * | 2010-06-02 | 2012-01-04 | 东北大学 | Control method of softness of oxide scales on surface of hot-rolling strip steel |
| KR101356946B1 (en) * | 2012-03-27 | 2014-01-29 | 주식회사 포스코 | Manufacturing method of duplex stainless steel |
| CN103769424B (en) * | 2014-01-08 | 2015-11-25 | 南京钢铁股份有限公司 | The control method of steekle mill surface of steel plate red scale |
| CN104138901B (en) * | 2014-07-17 | 2016-11-23 | 首钢总公司 | A kind of production method of the hot rolling acid-cleaning strip steel of thickness≤1.6mm |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Applicant after: Shougang Group Co. Ltd. Applicant after: Beijing Shougang Co., Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Applicant before: Capital Iron & Steel General Company Applicant before: Beijing Shougang Co., Ltd. |
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