CN104998917B - A kind of method for eliminating hot rolled sheet metal surface piebald defect - Google Patents
A kind of method for eliminating hot rolled sheet metal surface piebald defect Download PDFInfo
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- CN104998917B CN104998917B CN201510365103.2A CN201510365103A CN104998917B CN 104998917 B CN104998917 B CN 104998917B CN 201510365103 A CN201510365103 A CN 201510365103A CN 104998917 B CN104998917 B CN 104998917B
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Abstract
A kind of method for eliminating hot rolled sheet metal surface piebald defect, is related to a kind of surface of steel plate processing method, methods described to include procedure below：By heating of plate blank to 1200 ~ 1250 DEG C, then with high-pressure water descaling, de-scaling temperature is 1100 ~ 1200 DEG C, it is desirable to hydraulic pressure at least 16MPa during de-scaling；Steel plate after de-scaling is carried out into roughing, the temperature of roughing is 1100 ~ 1200 DEG C；Steel plate after roughing is carried out into finish rolling, the finishing temperature of finish rolling is 900 ~ 990 DEG C, and roller table speed is 1.3 ~ 1.8m/s；After finish rolling terminates, water-cooled is carried out by the way of section cooling, and using segmented cooling, water ratio is 2.2 ~ 2.6；Cooling water inflow is 150 ~ 250m3/h；The red temperature of steel plate is 670 ~ 750 DEG C after cooling；Steel plate after water-cooled is cooled down in air on cold bed.The method causes that the iron scale of surface of steel plate is easily removed during follow-up ball blast, so as to eliminate the piebald defect after surface of steel plate ball blast.
Description
Technical field
It is more particularly to a kind of to eliminate hot rolled sheet metal surface piebald defect the present invention relates to a kind of surface of steel plate processing method
Method.
Background technology
The steel plate of rolled can produce one layer of iron scale in the operation of rolling in surface of steel plate.In different hot-rolled conditions
Under, the structure and thickness of the iron scale for obtaining are changes.Hot rolled plate is played a greater and greater role in national economy, but
Concern is primarily with performance quality and dimensional accuracy, surface quality has become the row of restriction China hot rolled plate oeverall quality lifting
Industry common problem.Paid close attention to due to lacking to hot-strip surface quality for a long time, these products are often because iron sheet control in surface is improper
And the problems such as there is red rust, pockmark and pit, trigger numerous quality objections even to return goods, seriously hinder carrying for product specification
Rise.Especially reacted through downstream user, rolled steel plate finds by after the iron scale of ball blast pretreatment removal surface of steel plate,
Large area, the particularly surface defect of slabbing distribution, the rough defect of strip or sheet can be often shown, often claims this
It is piebald defect to plant defect.Again by after follow-up enamelling process, the surface defect of steel plate can be more obvious, so needing to steel
Plate surface carries out the reconditioning of large area, and this has had a strong impact on rhythm of production and logistics arrangement, as production bottleneck.If defect journey
Degree is serious, more than certain roughness, then departs from production contract, it is impossible to handover user and cause great mass loss.Therefore, it is
One seat is occupied in international market with keen competition, it is necessary to develop and solve the proprietary of China's hot-strip surface quality problems
Technology, it is very necessary to eliminate steel plate piebald defect.
At present on the measure of cleaning surface of steel plate iron scale a lot, but in view of the removing of many counting methods is stove life oxidation
Iron sheet, once oxidation iron sheet and secondary iron oxide before finish rolling.Chinese Patent Application No. 200710010183.5《Medium thin slab
Continuous casting and rolling steel surface iron scale control method》Give includes composition design, de-scaling for medium thin slab hot-strip
Technique, rolling and cooling technique interior iron scale control method, but be primarily directed to medium thin slab short route production
Line, what is mainly solved is how to remove surface red rust, is not referred to how to eliminate the chromatic aberration defect after surface of steel plate ball blast.In
State's number of patent application 201010010116.5《A kind of method that chemical attack detects hot rolling strip steel scale structure》Give
A kind of chemical detection method of Surfaces of Hot Rolled Strip scale structure is detected, for the structure for controlling surface of steel plate iron scale
It is not described with thickness etc..Chinese Patent Application No. 201010189410.7《Softness of oxide scales on surface of hot-rolling strip steel control
Method processed》The structure of hot rolling line belt steel surface iron scale and the control method of adhesiveness are given, is primarily directed to
The iron scale of different structure shows different processing characteristics in follow-up deep-processing process, how according to downstream manufacturing enterprise
Deep process feature（With the presence or absence of inunction process）Come requirement correspondence different structure iron scale, be not related to as
What is the need except the surface defect of steel plate.Chinese Patent Application No. 201010209526.2《Thickness of scale on surface of hot continuous rolling strip steel
Flexible measurement method》By the constant temperature oxidation kinetic model set up, the oxidation kinetics model under temperature match curing conditions is pushed over out, utilized
The real time temperature of hot continuous rolling is predicted come the thickness to iron scale, then parameter can be modified to reach reduction oxygen
Change the thickness of iron sheet, improve the purpose of strip surface quality.
In consideration of it, the present invention is foundation according to the piebald defect formed after steel plate impeller blasting and japanning, analysis piebald is produced
Reason, it is proposed that surface of steel plate oxygen is adjusted by the technological parameter in adjusting course of hot rolling and the type of cooling after controlled rolling
Change the state of iron sheet, and then reach the effective ways for eliminating steel plate piebald defect.
The content of the invention
It is an object of the invention to provide a kind of method for eliminating hot rolled sheet metal surface piebald defect, the method is by control
Rolled surface of steel plate iron scale eliminates piebald defect, by after the technological parameter in adjusting course of hot rolling and controlled rolling
The type of cooling adjusts the state of surface of steel plate iron scale so that the iron scale of surface of steel plate is in follow-up ball blast process
In be easily removed, so as to eliminate the piebald defect after surface of steel plate ball blast.
The purpose of the present invention is achieved through the following technical solutions：
A kind of method for eliminating hot rolled sheet metal surface piebald defect, methods described includes procedure below：
（1）By heating of plate blank to 1200 ~ 1250 DEG C, then with high-pressure water descaling, de-scaling temperature is 1100 ~ 1200 DEG C,
Hydraulic pressure at least 16MPa when asking de-scaling；
（2）Steel plate after de-scaling is carried out into roughing, the temperature of roughing is 1100 ~ 1200 DEG C；
（3）Steel plate after roughing being carried out into finish rolling, the finishing temperature of finish rolling is 900 ~ 990 DEG C, roller table speed is 1.3 ~
1.8m/s；
（4）After finish rolling terminates, water-cooled is carried out by the way of section cooling, and using segmented cooling, water ratio is 2.2 ~
2.6；Cooling water inflow is 150 ~ 250m3/h；The red temperature of steel plate is 670 ~ 750 DEG C after cooling；
（5）Steel plate after water-cooled is cooled down in air on cold bed.
Advantages of the present invention is with effect：
1. the present invention proposes the technology path of " high-temperature final rolling, fast speed rolling " to reduce between iron scale and matrix steel
Interface length, significantly reduce iron scale in the operation of rolling, degree of crushing under the high temperature conditions, and reduce oxidation
The thickness of iron sheet.
2. the present invention is proposed in terms of the cooling after rolling, and employs the cooling route of " high temperature, small water ", by control
The red temperature of steel plate so that the iron scale of surface of steel plate after cooling is without Fragmentation Phenomena.
3. the present invention for surface of steel plate ball blast and japanning after piebald defect, by adjust rolling and cooling procedure in
Technological parameter, control iron scale and the interface length of matrix, reduce the thickness of iron scale, so as to reduce steel plate impeller blasting
Difficulty, eliminates 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, and life is improve again
Produce efficiency, it is ensured that the surface quality and mechanical property of steel plate, be finally capable of achieving the Flexible Production of iron scale control.
Brief description of the drawings
Fig. 1 under the conditions of example 1, steel plate through rolling and water-cooled after, in the surface topography map of cooling bed steel-feeding plate；
Fig. 2 under the conditions of example 1, the surface topography map after steel plate impeller blasting；
Fig. 3 under the conditions of example 2, steel plate through rolling and water-cooled after, in the surface topography map of cooling bed steel-feeding plate；
Fig. 4 under the conditions of example 2, the surface topography map after steel plate impeller blasting；
Fig. 5 under the conditions of example 3, steel plate through rolling and water-cooled after, in the surface topography map of cooling bed steel-feeding plate；
Fig. 6 under the conditions of example 4, the surface topography map after steel plate impeller blasting；
Fig. 7 under the conditions of example 5, the microscopic appearance figure of surface of steel plate iron scale.
Specific embodiment
With reference to embodiment, the present invention is described in detail.
Embodiment 1
（1）By heating of plate blank to 1200 DEG C, then with high-pressure water descaling, de-scaling temperature is 1150 DEG C, hydraulic pressure during de-scaling
16MPa；
（2）Steel plate after de-scaling is carried out into roughing, the temperature of roughing is 1100 DEG C；
（3）Steel plate after roughing is carried out into 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, water-cooled is carried out by the way of section cooling, and using segmented cooling, water ratio is 2.3；
Cooling water inflow is 150m3/h；The red temperature of steel plate is 680 DEG C after cooling；
（5）Steel plate after water-cooled is cooled down in air on cold bed.
After steel plate is through rolling and water-cooled, the photo cooled down on cold bed is as shown in Figure 1.It will be seen from figure 1 that steel plate is through warm
After rolling, there is no iron scale Fragmentation Phenomena, any surface finish in surface.Under the process of example 1, surface of steel plate iron oxide
Skin steel plate is as shown in Figure 2 through the surface topography after ball blast.From figure 2, it is seen that after surface of steel plate is through ball blast, there is no iron scale residual
Stay, there is no piebald defect.
Embodiment 2
（1）By heating of plate blank to 1220 DEG C, then with high-pressure water descaling, de-scaling temperature is 1180 DEG C, and hydraulic pressure is extremely during de-scaling
Few 17MPa；
（2）Steel plate after de-scaling is carried out into roughing, the temperature of roughing is 1120 DEG C；
（3）Steel plate after roughing is carried out into 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, water-cooled is carried out by the way of section cooling, and using segmented cooling, water ratio is 2.4；
Cooling water inflow is 200m3/h；The red temperature of steel plate is 700 DEG C after cooling；
（5）Steel plate after water-cooled is cooled down in air on cold bed.
After steel plate is through rolling and water-cooled, the photo cooled down on cold bed is as shown in Figure 3.As can be seen from Figure 3, steel plate is on cold bed
During cooling, surface is smooth, does not have iron sheet to crush.Steel plate is as shown in Figure 4 through the surface topography after ball blast.As can be seen from Figure 4, steel plate table
After face is through ball blast, there is no iron scale to remain, there is no piebald defect.
Embodiment 3
（1）By heating of plate blank to 1240 DEG C, then with high-pressure water descaling, de-scaling temperature is 1200 DEG C, hydraulic pressure during de-scaling
19MPa；
（2）Steel plate after de-scaling is carried out into roughing, the temperature of roughing is 1180 DEG C；
（3）Steel plate after roughing is carried out into 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, water-cooled is carried out by the way of section cooling, and using segmented cooling, water ratio is 2.5；
Cooling water inflow is 250m3/h；The red temperature of steel plate is 730 DEG C after cooling；
（5）Steel plate after water-cooled is cooled down in air on cold bed.
After steel plate is through rolling and water-cooled, the photo cooled down on cold bed is as shown in Figure 5.As can be seen from Figure 5, in the work of example 3
Under the conditions of skill, there is no iron scale Fragmentation Phenomena, any surface finish after surface of steel plate is hot rolled.
Embodiment 4
（1）By heating of plate blank to 1250 DEG C, then with high-pressure water descaling, de-scaling temperature is 1200 DEG C, hydraulic pressure during de-scaling
20MPa；
（2）Steel plate after de-scaling is carried out into roughing, the temperature of roughing is 1170 DEG C；
（3）Steel plate after roughing is carried out into 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, water-cooled is carried out by the way of section cooling, and using segmented cooling, water ratio is 2.6；
Cooling water inflow is 150m3/h；The red temperature of steel plate is 720 DEG C after cooling；
（5）Steel plate after water-cooled is cooled down in air on cold bed.
Steel plate is as shown in Figure 6 through the surface topography after ball blast.As can be seen from Figure 6, under the process conditions of example 4, hot-rolled steel
After ball blast, surface does not have piebald defect to occur to plate, and shot-blasting quality is good.
Embodiment 5
（1）By heating of plate blank to 1210 DEG C, then with high-pressure water descaling, de-scaling temperature is 1190 DEG C, hydraulic pressure during de-scaling
18MPa；
（2）Steel plate after de-scaling is carried out into roughing, the temperature of roughing is 1150 DEG C；
（3）Steel plate after roughing is carried out into 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, water-cooled is carried out by the way of section cooling, and using segmented cooling, water ratio is 2.3；
Cooling water inflow is 200m3/h；The red temperature of steel plate is 750 DEG C after cooling；
（5）Steel plate after water-cooled is cooled down in air on cold bed.
The microscopic appearance of surface of steel plate iron scale is as shown in Figure 7.As seen from Figure 7, after steel plate is cooled to room temperature, oxidation
The thickness of iron sheet is 56 μm, and iron scale is straight with the interface of matrix.The iron scale thickness that profit is produced in this way is smaller,
Interface glacing flatness is high, is conducive to follow-up ball blast process.
Claims (1)
1. it is a kind of eliminate hot rolled sheet metal surface piebald defect method, it is characterised in that methods described include procedure below：
（1）By heating of plate blank to 1200 ~ 1250 DEG C, then with high-pressure water descaling, de-scaling temperature is 1100 ~ 1200 DEG C, it is desirable to removed
Hydraulic pressure at least 16MPa during squama；
（2）Steel plate after de-scaling is carried out into roughing, the temperature of roughing is 1100 ~ 1200 DEG C；
（3）Steel plate after roughing is carried out into 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, water-cooled is carried out by the way of section cooling, and using segmented cooling, water ratio is 2.2 ~ 2.6；
Cooling water inflow is 150 ~ 250m3/h；The red temperature of steel plate is 670 ~ 750 DEG C after cooling；
（5）Steel plate after water-cooled is cooled down in air on cold bed.
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| CN106216392B (en) * | 2016-07-19 | 2017-12-29 | 东北大学 | One kind eliminates cut deal piebald defects controlling method |
| CN109794516B (en) * | 2019-01-28 | 2021-04-20 | 东北大学 | Control method for eliminating pit defect of medium plate |
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| JPH10128418A (en) * | 1996-10-21 | 1998-05-19 | Kobe Steel Ltd | Device for measuring sheet crown rate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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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 |