CN104998917A - Method for removing streak defects on hot rolled steel plate surface - Google Patents
Method for removing streak defects on hot rolled steel plate surface Download PDFInfo
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- CN104998917A CN104998917A CN201510365103.2A CN201510365103A CN104998917A CN 104998917 A CN104998917 A CN 104998917A CN 201510365103 A CN201510365103 A CN 201510365103A CN 104998917 A CN104998917 A CN 104998917A
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Abstract
The invention discloses a method for removing streak defects on a hot rolled steel plate surface and relates to a steel plate surface treatment method. The method comprises the following process: heating plate blank to 1200-1250 DEG C, and then, descaling by high pressure water at a descaling temperature of 1100-1200 DEG C, wherein water pressure required for descaling is at least 16 MPa; carrying out rough rolling on a descaled steel plate at a rough rolling temperature of 1100-1200 DEG C; carrying out finish rolling on the steel plate subjected to rough rolling, wherein a final rolling temperature of the finish rolling is 900-990 DEG C, and the speed of a roller way is 1.3-1.8m/s; after the finish rolling is ended, carrying out water-cooling by adopting a laminar cooling mode, and adopting sectional type cooling, wherein a water ratio is 2.2-2.6, the cooling water consumption is 150-250m<3>/h, and a red temperature of the cooled steel plate is 670-750 DEG C; and cooling the water-cooled steel plate in air at a cold bed. According to the method, oxide iron scale on the surface of the steel plate is easy to remove in a follow-up shot blasting process, thereby removing the streak defects on the steel plate surface subjected to shot blasting.
Description
Technical field
The present invention relates to a kind of surface of steel plate processing method, particularly relate to a kind of method eliminating hot rolled sheet metal surface piebald defect.
Background technology
The steel plate of As rolled can produce one deck iron scale at surface of steel plate in the operation of rolling.Under different hot-rolled conditions, the structure of the iron scale obtained and thickness are changes.Hot rolled plate is played a greater and greater role in national economy, but main concern is performance quality and dimensional accuracy, and surface quality has become the industry common problem that restriction China hot rolled plate oeverall quality promotes.Pay close attention to owing to lacking hot-strip surface quality for a long time, often there is the problems such as red rust, pockmark and pit because surperficial iron sheet controls improper in these products, causes numerous quality objection and even return goods, seriously hinder the lifting of product specification.Especially react through downstream user; As rolled steel plate finds after the iron scale that surface of steel plate is removed in ball blast pretreatment; often can show large area, the blemish, particularly strip of slabbing distribution or the rough defect of sheet, often claim this defect to be piebald defect.Again after follow-up enamelling process, the blemish of steel plate can be more obvious, so need to carry out large-area reconditioning to surface of steel plate, this has had a strong impact on rhythm of production and logistics arrangement, becomes production bottleneck.If defect level is serious, exceed certain roughness, then depart from production contract, cannot handover user and cause great mass loss.Therefore, for occupying one seat in international market with keen competition, must develop the proprietary technology solving China's hot-strip surface quality problems, it is very necessary for eliminating steel plate piebald defect.
At present a lot of about the measure of cleaning surface of steel plate iron scale, but what consider that most method removes is that secondary iron oxide before iron scale, once oxidation iron sheet and finish rolling given birth to by stove.Chinese Patent Application No. 200710010183.5 " medium thin slab continuous casting and rolling belt steel surface iron scale control method " gives the control method of iron scale comprising Composition Design, descaling process, rolling and process for cooling for medium thin slab hot-strip, but mainly for be medium thin slab short-flow production line, what mainly solve is how to remove surperficial red rust, not mentioned to the chromatic aberration defect how eliminated after surface of steel plate ball blast.Chinese Patent Application No. 201010010116.5 " a kind of chemical attack detects the method for hot rolling strip steel scale structure " gives a kind of chemical detection method detecting Surfaces of Hot Rolled Strip scale structure, does not introduce for controlling the structure of surface of steel plate iron scale and thickness etc.Chinese Patent Application No. 201010189410.7 " control method of softness of oxide scales on surface of hot-rolling strip steel " gives the structure of hot rolling line belt steel surface iron scale and adhering control method, mainly for be that the iron scale of different structure shows different processing characteristics in follow-up deep-processing process, how carry out the iron scale of the corresponding different structure of requirement according to the deep process feature (whether there is inunction process) of downstream manufacturing enterprise, do not relate to the blemish how eliminating steel plate.The constant temperature oxidation kinetic model of Chinese Patent Application No. 201010209526.2 " soft measurement method of thickness of scale on surface of hot continuous rolling strip steel " by setting up, push over out the oxidation kinetics model under temperature match curing conditions, the thickness of the real time temperature of hot continuous rolling to iron scale is utilized to predict, then can modify to reach the thickness reducing iron scale to parameter, improve the object of strip surface quality.
Given this, the present invention is foundation according to the piebald defect formed after steel plate impeller blasting and japanning, analyze piebald Producing reason, propose the state being adjusted surface of steel plate iron scale by the technological parameter in adjustment course of hot rolling and the type of cooling after controlled rolling, and then reach the effective ways eliminating steel plate piebald defect.
Summary of the invention
The object of the present invention is to provide a kind of method eliminating hot rolled sheet metal surface piebald defect, the method eliminates piebald defect by controlling As rolled surface of steel plate iron scale, by the technological parameter in adjustment course of hot rolling and the type of cooling after controlled rolling, adjust the state of surface of steel plate iron scale, make the iron scale of surface of steel plate be easy to remove in follow-up ball blast process, thus eliminate the piebald defect after surface of steel plate ball blast.
The object of the invention is to be achieved through the following technical solutions:
Eliminate a method for hot rolled sheet metal surface piebald defect, described method comprises following process:
(1) by heating of plate blank to 1200 ~ 1250 DEG C, then use high-pressure water descaling, de-scaling temperature is 1100 ~ 1200 DEG C, hydraulic pressure at least 16MPa when requiring de-scaling;
(2) steel plate after de-scaling is carried out roughing, the temperature of roughing is 1100 ~ 1200 DEG C;
(3) steel plate after roughing is carried out finish rolling, the finishing temperature of finish rolling is 900 ~ 990 DEG C, and roller table speed is 1.3 ~ 1.8m/s;
(4), after finish rolling terminates, adopt the mode of section cooling to carry out water-cooled, and adopt segmented to cool, water ratio is 2.2 ~ 2.6; Cooling water inflow is 150 ~ 250m3/h; After cooling, the red temperature of steel plate is 670 ~ 750 DEG C;
(5) steel plate after water-cooled cools in air on cold bed.
Advantage of the present invention and effect are:
1. the present invention proposes the technology path of " high-temperature final rolling, fast speed rolling " to reduce the interface length between iron scale and matrix steel, significantly reduce iron scale in the operation of rolling, degree of crushing under the high temperature conditions, and the thickness reducing iron scale.
2. the present invention proposes in the cooling after rolling, have employed the cooling route of " high temperature, the little water yield ", by controlling the red temperature of steel plate, making iron scale through cooled surface of steel plate without Fragmentation Phenomena.
3. the present invention is directed to the piebald defect after surface of steel plate ball blast and japanning, by the technological parameter in adjustment rolling and cooling procedure, the interface length of controlled oxidization iron sheet and matrix, reduce the thickness of iron scale, thus reduce the difficulty of steel plate impeller blasting, eliminate the chromatic aberration defect after surface of steel plate ball blast and japanning.
4. the present invention utilizes steel mill's existing equipment and process conditions, neither increases investment and production cost, turn improves production efficiency, ensures surface quality and the mechanical property of steel plate, finally can achieve the Flexible Production that iron scale controls.
Accompanying drawing explanation
Fig. 1 under example 1 condition, steel plate after rolling and water-cooled, at the surface topography map of cooling bed steel-feeding plate;
Fig. 2 under example 1 condition, the surface topography map after steel plate impeller blasting;
Fig. 3 under example 2 condition, steel plate after rolling and water-cooled, at the surface topography map of cooling bed steel-feeding plate;
Fig. 4 under example 2 condition, the surface topography map after steel plate impeller blasting;
Fig. 5 under example 3 condition, steel plate after rolling and water-cooled, at the surface topography map of cooling bed steel-feeding plate;
Fig. 6 under example 4 condition, the surface topography map after steel plate impeller blasting;
Fig. 7 under example 5 condition, the microscopic appearance figure of surface of steel plate iron scale.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in detail.
Embodiment 1
(1) by heating of plate blank to 1200 DEG C, then use high-pressure water descaling, de-scaling temperature is 1150 DEG C, hydraulic pressure 16MPa during de-scaling;
(2) steel plate after de-scaling is carried out roughing, the temperature of roughing is 1100 DEG C;
(3) steel plate after roughing is carried out finish rolling, the finishing temperature of finish rolling is 950 DEG C, and roller table speed is 1.4m/s;
(4), after finish rolling terminates, adopt the mode of section cooling to carry out water-cooled, and adopt segmented to cool, water ratio is 2.3; Cooling water inflow is 150m3/h; After cooling, the red temperature of steel plate is 680 DEG C;
(5) steel plate after water-cooled cools in air on cold bed.
Steel plate is after rolling and water-cooled, and the photo that cold bed cools as shown in Figure 1.As can be seen from Figure 1, steel plate is after hot rolling, and iron scale Fragmentation Phenomena does not occur on surface, any surface finish.Under the process of example 1, the surface topography of surface of steel plate iron scale steel plate after ball blast as shown in Figure 2.As can be seen from Figure 2, surface of steel plate, after ball blast, does not have iron scale to remain, does not have piebald defect.
Embodiment 2
(1) by heating of plate blank to 1220 DEG C, then use high-pressure water descaling, de-scaling temperature is 1180 DEG C, hydraulic pressure at least 17MPa during de-scaling;
(2) steel plate after de-scaling is carried out roughing, the temperature of roughing is 1120 DEG C;
(3) steel plate after roughing is carried out finish rolling, the finishing temperature of finish rolling is 960 DEG C, and roller table speed is 1.5m/s;
(4), after finish rolling terminates, adopt the mode of section cooling to carry out water-cooled, and adopt segmented to cool, water ratio is 2.4; Cooling water inflow is 200m3/h; After cooling, the red temperature of steel plate is 700 DEG C;
(5) steel plate after water-cooled cools in air on cold bed.
Steel plate is after rolling and water-cooled, and the photo that cold bed cools as shown in Figure 3.As can be seen from Figure 3, when steel plate cools on cold bed, smooth surface, does not have iron sheet broken.The surface topography of steel plate after ball blast as shown in Figure 4.As can be seen from Figure 4, surface of steel plate, after ball blast, does not have iron scale to remain, does not have piebald defect.
Embodiment 3
(1) by heating of plate blank to 1240 DEG C, then use high-pressure water descaling, de-scaling temperature is 1200 DEG C, hydraulic pressure 19MPa during de-scaling;
(2) steel plate after de-scaling is carried out roughing, the temperature of roughing is 1180 DEG C;
(3) steel plate after roughing is carried out finish rolling, the finishing temperature of finish rolling is 980 DEG C, and roller table speed is 1.7m/s;
(4), after finish rolling terminates, adopt the mode of section cooling to carry out water-cooled, and adopt segmented to cool, water ratio is 2.5; Cooling water inflow is 250m3/h; After cooling, the red temperature of steel plate is 730 DEG C;
(5) steel plate after water-cooled cools in air on cold bed.
Steel plate is after rolling and water-cooled, and the photo that cold bed cools as shown in Figure 5.As can be seen from Figure 5, under the process conditions of example 3, there is not iron scale Fragmentation Phenomena in surface of steel plate, any surface finish after hot rolling.
Embodiment 4
(1) by heating of plate blank to 1250 DEG C, then use high-pressure water descaling, de-scaling temperature is 1200 DEG C, hydraulic pressure 20MPa during de-scaling;
(2) steel plate after de-scaling is carried out roughing, the temperature of roughing is 1170 DEG C;
(3) steel plate after roughing is carried out finish rolling, the finishing temperature of finish rolling is 930 DEG C, and roller table speed is 1.3m/s;
(4), after finish rolling terminates, adopt the mode of section cooling to carry out water-cooled, and adopt segmented to cool, water ratio is 2.6; Cooling water inflow is 150m3/h; After cooling, the red temperature of steel plate is 720 DEG C;
(5) steel plate after water-cooled cools in air on cold bed.
The surface topography of steel plate after ball blast as shown in Figure 6.As can be seen from Figure 6, under the process conditions of example 4, hot rolled steel plate is after ball blast, and surface does not have piebald defect to occur, shot-blasting quality is good.
Embodiment 5
(1) by heating of plate blank to 1210 DEG C, then use high-pressure water descaling, de-scaling temperature is 1190 DEG C, hydraulic pressure 18MPa during de-scaling;
(2) steel plate after de-scaling is carried out roughing, the temperature of roughing is 1150 DEG C;
(3) steel plate after roughing is carried out finish rolling, the finishing temperature of finish rolling is 920 DEG C, and roller table speed is 1.5m/s;
(4), after finish rolling terminates, adopt the mode of section cooling to carry out water-cooled, and adopt segmented to cool, water ratio is 2.3; Cooling water inflow is 200m3/h; After cooling, the red temperature of steel plate is 750 DEG C;
(5) steel plate after water-cooled cools in air on cold bed.
The microscopic appearance of surface of steel plate iron scale as shown in Figure 7.As seen from Figure 7, after steel plate cool to room temperature, the thickness of iron scale is 56 μm, and the interface of iron scale and matrix is straight.The iron scale thickness that profit is produced in this way is less, and interface glacing flatness is high, is conducive to follow-up ball blast process.
Claims (1)
1. eliminate a method for hot rolled sheet metal surface piebald defect, it is characterized in that, described method comprises following process:
(1) by heating of plate blank to 1200 ~ 1250 DEG C, then use high-pressure water descaling, de-scaling temperature is 1100 ~ 1200 DEG C, hydraulic pressure at least 16MPa when requiring de-scaling;
(2) steel plate after de-scaling is carried out roughing, the temperature of roughing is 1100 ~ 1200 DEG C;
(3) steel plate after roughing is carried out finish rolling, the finishing temperature of finish rolling is 900 ~ 990 DEG C, and roller table speed is 1.3 ~ 1.8m/s;
(4), after finish rolling terminates, adopt the mode of section cooling to carry out water-cooled, and adopt segmented to cool, water ratio is 2.2 ~ 2.6; Cooling water inflow is 150 ~ 250m3/h; After cooling, the red temperature of steel plate is 670 ~ 750 DEG C;
(5) steel plate after water-cooled cools in air on cold bed.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106216392A (en) * | 2016-07-19 | 2016-12-14 | 东北大学 | A kind of elimination cut deal piebaldism defects controlling method |
| CN109794516A (en) * | 2019-01-28 | 2019-05-24 | 东北大学 | A kind of control method for eliminating cut deal pit defect |
| CN110976516A (en) * | 2019-12-30 | 2020-04-10 | 唐山市德龙钢铁有限公司 | Rolling method for eliminating roll marks on surface of hot-rolled strip steel |
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| JPH10128418A (en) * | 1996-10-21 | 1998-05-19 | Kobe Steel Ltd | Device for measuring sheet crown rate |
| CN101012528A (en) * | 2007-01-25 | 2007-08-08 | 鞍钢股份有限公司 | Method for controlling iron scale on surface of strip steel produced by continuous casting and rolling of medium and thin slabs |
| CN101856669A (en) * | 2010-06-02 | 2010-10-13 | 东北大学 | Control method of softness of oxide scales on surface of hot-rolling strip steel |
| CN102989785A (en) * | 2012-12-17 | 2013-03-27 | 济钢集团有限公司 | Process for controlling surface piebaldness of steel plates |
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2015
- 2015-06-29 CN CN201510365103.2A patent/CN104998917B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10128418A (en) * | 1996-10-21 | 1998-05-19 | Kobe Steel Ltd | Device for measuring sheet crown rate |
| CN101012528A (en) * | 2007-01-25 | 2007-08-08 | 鞍钢股份有限公司 | Method for controlling iron scale on surface of strip steel produced by continuous casting and rolling of medium and thin slabs |
| CN101856669A (en) * | 2010-06-02 | 2010-10-13 | 东北大学 | Control method of softness of oxide scales on surface of hot-rolling strip steel |
| CN102989785A (en) * | 2012-12-17 | 2013-03-27 | 济钢集团有限公司 | Process for controlling surface piebaldness of steel plates |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106216392A (en) * | 2016-07-19 | 2016-12-14 | 东北大学 | A kind of elimination cut deal piebaldism defects controlling method |
| CN106216392B (en) * | 2016-07-19 | 2017-12-29 | 东北大学 | One kind eliminates cut deal piebald defects controlling method |
| CN109794516A (en) * | 2019-01-28 | 2019-05-24 | 东北大学 | A kind of control method for eliminating cut deal pit defect |
| CN110976516A (en) * | 2019-12-30 | 2020-04-10 | 唐山市德龙钢铁有限公司 | Rolling method for eliminating roll marks on surface of hot-rolled strip steel |
| CN110976516B (en) * | 2019-12-30 | 2021-07-02 | 唐山市德龙钢铁有限公司 | Rolling method for eliminating roll marks on surface of hot-rolled strip steel |
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Effective date of registration: 20200727 Address after: Yongxing street, Honghui Road, hardware industrial park, Yuhong District, Shenyang City, Liaoning Province Patentee after: Shenyang Chengwei Machinery Manufacturing Co., Ltd Address before: 110044 Liaoning Province, Shenyang City District wanghuanan Street No. 21 Patentee before: SHENYANG University |