CN102921726B - Method for improving corrosion resistance of hot-rolled plate by utilizing oxide scale - Google Patents
Method for improving corrosion resistance of hot-rolled plate by utilizing oxide scale Download PDFInfo
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- CN102921726B CN102921726B CN201210461252.5A CN201210461252A CN102921726B CN 102921726 B CN102921726 B CN 102921726B CN 201210461252 A CN201210461252 A CN 201210461252A CN 102921726 B CN102921726 B CN 102921726B
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Abstract
The invention provides a method for improving the corrosion resistance of a hot-rolled plate by utilizing oxide scale. The method is characterized in that liquid steel is smelted and continuously casted to form to a plate slab; the plate slab is descaled and hot-rolled after being heated and thermally insulated; the final rolling temperature is 930 to 970 DEG, and the speed of a roller table is 1.5 to 1.9m/s; after finish rolling is completed, the plate slab can be water-cooled by adopting a laminar cooling manner; the water ratio is 2.2 to 2.5 and the cooling water volume is 150 to 200m<3>/h; the plate slab can also be water-cooled by adopting a joint cooling manner of ultrafast cooling plus laminar cooling; and the cooling water volume of ultrafast cooling is 150 to 250m<3>/h, the cooling water volume of laminar cooling is 150 to 200m<3>/h, the water ratio of ultrafast cooling is 1.5 to 1.8, the final cooling temperature is 670 to 750 DEG C, and all side-blowing devices needs to be shut off in the cooling process. The method has the advantages that the atmospheric corrosion resistance of the hot-rolled steel plate can be improved only by conducting simple operation through conventional equipment.
Description
Technical field
The invention belongs to corrosion field, particularly one utilizes iron scale to improve the corrosion proof method of hot rolled steel plate.
Background technology
Hot rolled plate is the kind that in hot rolling series products, proportion is maximum, generally sells as finished product or as the raw material of follow-up cold rolling production.The hot rolled plate of most directly supply of material does not all have external packing, because the atmospheric corrosion of environment and bale packing are intake and be detained the Local electrochemical crevice corrosion that causes and make hot rolled sheet metal surface generation corrosion or present serious " pockmark " shape erosion profile, the objection of initiation user quality in transport and storing process.In recent years, along with the raising of progressively expansion and down-stream enterprise's production management code and the requirement of the hot rolled plate scope of application, the surface corrosion of hot rolling series products receives increasing concern.
The method of current raising hot rolled steel plate is mainly divided into two classes, and the first kind is in steel, add the alloying element of weatherability, improves the atmospheric corrosion resistance of steel plate itself, such as, add the alloying element of the weatherabilities such as P and Cu; Equations of The Second Kind is in surface of steel plate coated, and such as Aplataer process and electrogalvanizing etc. plate the better zinc layers of corrosion resistance at surface of steel plate, or utilize liquid metal gunite etc. in surface of steel plate spraying other corrosion resistant coatings to increase the corrosion resistance of steel plate.In above-mentioned two class ways, all need the cost increasing steel plate extraly.Although the corrosion resisting property of steel plate improves, because cost price goes up, steel plate competitiveness commercially itself is declined to some extent.
The present invention is not adding weatherability alloying element, and does not have on the basis of other coatings at surface of steel plate, only utilizes the iron scale that steel plate is formed in the hot rolling, improves the corrosion resisting property of hot rolled steel plate.This scale structure is fine and close, thickness is even, and iron sheet does not occur Fragmentation Phenomena after rolling and water-cooled.This iron scale not only can solve steel plate in transport and storage process because the atmospheric corrosion of environment and bale packing are intake and be detained the atmospheric corrosion caused, and does not also increase the cost of steel plate, thus improves hot rolled steel plate competitiveness commercially.
Summary of the invention
The object of the present invention is to provide one to utilize iron scale to improve the corrosion proof method of hot rolled steel plate, the method, by conventional equipment, is carried out shirtsleeve operation, can be improved hot rolled steel plate atmospheric corrosion resistance.
One utilizes iron scale to improve the corrosion proof method of hot rolled steel plate:
1, first steel plate, after heating, will carry out just de-scaling before roughing, requires the raw iron scale of stove will removing surface of steel plate in first de-scaling process.First de-scaling adopts high-pressure water descaling, pressure >=18 MPa of de-scaling water.
2, before steel plate finish rolling, also will by surface of steel plate roughing and treat temperature process in the iron scale that formed eliminate, hydraulic pressure >=18 MPa of smart de-scaling.
3, in the steel plate finish rolling operation of rolling, finishing temperature is 930 ~ 970 DEG C, and roller table speed is 1.5 ~ 1.9 meter per seconds.
4, after steel plate finish rolling terminates, the mode of section cooling can be adopted to carry out water-cooled, and water ratio is 2.2 ~ 2.5; Cooling water inflow is 150 ~ 200 cubes ms/h; The mode that ultra-rapid cooling and section cooling also can be adopted jointly to cool carries out water-cooled, the cooling water inflow of ultra-rapid cooling is 150 ~ 250 cubes ms/h, the cooling water inflow of section cooling is 150 ~ 200 cubes ms/h, the water ratio exceeding speed cooling is 1.5 ~ 1.8, final cooling temperature is 670 ~ 750 DEG C, will close all side-blowns in cooling procedure.
5, after going out cooling water, steel plate is chilled to room temperature in cold bed overhead.After air cooling to room temperature, surface of steel plate is covered with the iron oxide cortex of blue layer.The adhesiveness of this layer of iron scale and steel plate more by force and very fine and close, can improve the effect of steel plate atmospheric corrosion resistance.
Method of the present invention is under the prerequisite ensureing plate property, by means of only parameters such as adjustment hot rolling, de-scaling and coolings, improves the effect of steel plate atmospheric corrosion resistance.The present invention, compared with the method for traditional raising steel plate atmospheric corrosion resistance, has saved the cost of steel plate, and equipment requirement is simple, and applicability is extensive.
Accompanying drawing explanation
Fig. 1 is the macro morphology of the surface of steel plate of example 1;
Fig. 2 is the microscopic appearance of the iron scale of example 1;
Fig. 3 is the microscopic appearance of the iron scale of example 2;
Fig. 4 is the macro morphology of the surface of steel plate of example 3;
Fig. 5 is the microscopic appearance of the iron scale of example 4.
Detailed description of the invention
Embodiment 1
One utilizes iron scale to improve the corrosion proof method of hot rolled steel plate:
1, first steel plate, after heating, will carry out just de-scaling before roughing, requires the raw iron scale of stove will removing surface of steel plate in first de-scaling process.First de-scaling adopts high-pressure water descaling, pressure 18 MPa of de-scaling water.
2, before steel plate finish rolling, also will by surface of steel plate roughing and treat temperature process in the iron scale that formed eliminate, hydraulic pressure 18 MPa of smart de-scaling.
3, in the steel plate finish rolling operation of rolling, finishing temperature is 930 DEG C, and roller table speed is 1.6 meter per seconds.
4, after steel plate finish rolling terminates, adopt the mode of section cooling to carry out water-cooled, water ratio is 2.3; Cooling water inflow is 200 cubes ms/h; Final cooling temperature is 680 DEG C, will close all side-blowns in cooling procedure.
5, after going out cooling water, steel plate is chilled to room temperature in cold bed overhead.After air cooling to room temperature, surface of steel plate is covered with the iron oxide cortex of blue layer, as shown in Figure 1.The microstructure of iron scale as shown in Figure 2.
Embodiment 2
One utilizes iron scale to improve the corrosion proof method of hot rolled steel plate:
1, first steel plate, after heating, will carry out just de-scaling before roughing, requires the raw iron scale of stove will removing surface of steel plate in first de-scaling process.First de-scaling adopts high-pressure water descaling, pressure 19 MPa of de-scaling water.
2, before steel plate finish rolling, also will by surface of steel plate roughing and treat temperature process in the iron scale that formed eliminate, hydraulic pressure 20 MPa of smart de-scaling.
3, in the steel plate finish rolling operation of rolling, finishing temperature is 945 DEG C, and roller table speed is 1.7 meter per seconds.
4, after steel plate finish rolling terminates, adopt the mode of section cooling to carry out water-cooled, water ratio is 2.4; Cooling water inflow is 150 cubes ms/h; Final cooling temperature is 692 DEG C, will close all side-blowns in cooling procedure.
5, after going out cooling water, steel plate is chilled to room temperature in cold bed overhead.After air cooling to room temperature, surface of steel plate is covered with the iron oxide cortex of blue layer.The microstructure of iron scale as shown in Figure 3.
Embodiment 3
One utilizes iron scale to improve the corrosion proof method of hot rolled steel plate:
1, first steel plate, after heating, will carry out just de-scaling before roughing, requires the raw iron scale of stove will removing surface of steel plate in first de-scaling process.First de-scaling adopts high-pressure water descaling, pressure 20 MPa of de-scaling water.
2, before steel plate finish rolling, also will by surface of steel plate roughing and treat temperature process in the iron scale that formed eliminate, hydraulic pressure 19 MPa of smart de-scaling.
3, in the steel plate finish rolling operation of rolling, finishing temperature is 952 DEG C, and roller table speed is 1.5 meter per seconds.
4, after steel plate finish rolling terminates, the mode adopting ultra-rapid cooling and section cooling jointly to cool carries out water-cooled, the cooling water inflow of ultra-rapid cooling is 200 cubes ms/h, the cooling water inflow of section cooling is 150 cubes ms/h, the water ratio of section cooling is 2.3, the water ratio exceeding speed cooling is 1.5, and final cooling temperature is 710 DEG C, will close all side-blowns in cooling procedure.
5, after going out cooling water, steel plate is chilled to room temperature in cold bed overhead.After air cooling to room temperature, surface of steel plate is covered with the iron oxide cortex of blue layer, as shown in Figure 4.
Embodiment 4
One utilizes iron scale to improve the corrosion proof method of hot rolled steel plate:
1, first steel plate, after heating, will carry out just de-scaling before roughing, requires the raw iron scale of stove will removing surface of steel plate in first de-scaling process.First de-scaling adopts high-pressure water descaling, pressure 20 MPa of de-scaling water.
2, before steel plate finish rolling, also will by surface of steel plate roughing and treat temperature process in the iron scale that formed eliminate, hydraulic pressure 20 MPa of smart de-scaling.
3, in the steel plate finish rolling operation of rolling, finishing temperature is 965 DEG C, and roller table speed is 1.8 meter per seconds.
4, after steel plate finish rolling terminates, the mode adopting ultra-rapid cooling and section cooling jointly to cool carries out water-cooled, the cooling water inflow of ultra-rapid cooling is 250 cubes ms/h, the cooling water inflow of section cooling is 200 cubes ms/h, the water ratio of section cooling is 2.2, the water ratio exceeding speed cooling is 1.6, and final cooling temperature is 720 DEG C, will close all side-blowns in cooling procedure.
5, after going out cooling water, steel plate is chilled to room temperature in cold bed overhead.After air cooling to room temperature, surface of steel plate is covered with the iron oxide cortex of blue layer.The microstructure of iron scale as shown in Figure 5.
Embodiment 5
One utilizes iron scale to improve the corrosion proof method of hot rolled steel plate:
1, first steel plate, after heating, will carry out just de-scaling before roughing, requires the raw iron scale of stove will removing surface of steel plate in first de-scaling process.First de-scaling adopts high-pressure water descaling, pressure 20 MPa of de-scaling water.
2, before steel plate finish rolling, also will by surface of steel plate roughing and treat temperature process in the iron scale that formed eliminate, hydraulic pressure 18 MPa of smart de-scaling.
3, in the steel plate finish rolling operation of rolling, finishing temperature is 970 DEG C, and roller table speed is 1.9 meter per seconds.
4, after steel plate finish rolling terminates, the mode adopting ultra-rapid cooling and section cooling jointly to cool carries out water-cooled, the cooling water inflow of ultra-rapid cooling is 150 cubes ms/h, the cooling water inflow of section cooling is 150 cubes ms/h, the water ratio of section cooling is 2.4, the water ratio exceeding speed cooling is 1.8, and final cooling temperature is 750 DEG C, will close all side-blowns in cooling procedure.
5, after going out cooling water, steel plate is chilled to room temperature in cold bed overhead.After air cooling to room temperature, surface of steel plate is covered with the iron oxide cortex of blue layer.
Claims (1)
1. utilize iron scale to improve the corrosion proof method of hot rolled steel plate, it is characterized in that: just de-scaling, after heating, will be carried out in (1), first steel plate before roughing, require the raw iron scale of stove will removing surface of steel plate in first de-scaling process; First de-scaling adopts high-pressure water descaling, pressure >=18 MPa of de-scaling water; (2), before steel plate finish rolling, also will by surface of steel plate roughing and treat temperature process in the iron scale that formed eliminate, hydraulic pressure >=18 MPa of smart de-scaling; (3), in the steel plate finish rolling operation of rolling, finishing temperature is 930 ~ 970 DEG C, and roller table speed is 1.5 ~ 1.9 meter per seconds; (4), after steel plate finish rolling terminates, adopt the mode of section cooling to carry out water-cooled, water ratio is 2.2 ~ 2.5; Cooling water inflow is 150 ~ 200 cubes ms/h; Or the mode adopting ultra-rapid cooling and section cooling jointly to cool carries out water-cooled, the cooling water inflow of ultra-rapid cooling is 150 ~ 250 cubes ms/h, the cooling water inflow of section cooling is 150 ~ 200 cubes ms/h, the water ratio exceeding speed cooling is 1.5 ~ 1.8, final cooling temperature is 670 ~ 750 DEG C, will close all side-blowns in cooling procedure; (5), go out cooling water after, steel plate is chilled to room temperature in cold bed overhead; After air cooling to room temperature, surface of steel plate is covered with the iron oxide cortex of blue layer; The adhesiveness of this layer of iron scale and steel plate more by force and very fine and close, can improve the effect of steel plate atmospheric corrosion resistance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210461252.5A CN102921726B (en) | 2012-11-15 | 2012-11-15 | Method for improving corrosion resistance of hot-rolled plate by utilizing oxide scale |
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| CN201210461252.5A CN102921726B (en) | 2012-11-15 | 2012-11-15 | Method for improving corrosion resistance of hot-rolled plate by utilizing oxide scale |
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| CN102921726A CN102921726A (en) | 2013-02-13 |
| CN102921726B true CN102921726B (en) | 2015-04-22 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103949480A (en) * | 2014-04-28 | 2014-07-30 | 沈阳大学 | Method for controlling oxide scales on surfaces of easily-pickled hot-rolled strip steel |
| CN106216392B (en) * | 2016-07-19 | 2017-12-29 | 东北大学 | One kind eliminates cut deal piebald defects controlling method |
| CN115382906A (en) * | 2022-08-25 | 2022-11-25 | 湖南华菱湘潭钢铁有限公司 | Production method of atmospheric corrosion resistant steel plate |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1099912A (en) * | 1996-09-30 | 1998-04-21 | Kawasaki Steel Corp | Hot rolled stainless steel plate and its manufacture |
| JPH10158732A (en) * | 1996-11-26 | 1998-06-16 | Nkk Corp | Manufacture of steel plate excellent in laser cutting property |
| CN1888120A (en) * | 2006-07-20 | 2007-01-03 | 武汉钢铁(集团)公司 | Ultra-high strength steel with excellent corrosion resistance and fatigue resistance and its making process |
| CN102596440A (en) * | 2009-11-24 | 2012-07-18 | 住友金属工业株式会社 | Hot-rolled steel sheet manufacturing method, and hot-rolled steel sheet manufacturing device |
-
2012
- 2012-11-15 CN CN201210461252.5A patent/CN102921726B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1099912A (en) * | 1996-09-30 | 1998-04-21 | Kawasaki Steel Corp | Hot rolled stainless steel plate and its manufacture |
| JPH10158732A (en) * | 1996-11-26 | 1998-06-16 | Nkk Corp | Manufacture of steel plate excellent in laser cutting property |
| CN1888120A (en) * | 2006-07-20 | 2007-01-03 | 武汉钢铁(集团)公司 | Ultra-high strength steel with excellent corrosion resistance and fatigue resistance and its making process |
| CN102596440A (en) * | 2009-11-24 | 2012-07-18 | 住友金属工业株式会社 | Hot-rolled steel sheet manufacturing method, and hot-rolled steel sheet manufacturing device |
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