CN111912855A - Method for acquiring rolling evolution process of large inclusions in casting blank - Google Patents
Method for acquiring rolling evolution process of large inclusions in casting blank Download PDFInfo
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- CN111912855A CN111912855A CN202010749671.3A CN202010749671A CN111912855A CN 111912855 A CN111912855 A CN 111912855A CN 202010749671 A CN202010749671 A CN 202010749671A CN 111912855 A CN111912855 A CN 111912855A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/20—Metals
- G01N33/204—Structure thereof, e.g. crystal structure
- G01N33/2045—Defects
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Abstract
The invention belongs to the technical field of rolling, and discloses a method for acquiring a rolling evolution process of large inclusions in a casting blank, which comprises the following steps: forming a groove on a casting blank, filling inclusions in the groove, and then plugging the groove by adopting a material which is the same as the casting blank; and rolling the casting blank to produce, and tracking and acquiring the macroscopic morphology and the defect size of the surface defect at the groove position. The method provided by the invention can be used for sufficiently and reliably researching the rolling evolution process of the large inclusions in the casting blank.
Description
Technical Field
The invention relates to the technical field of rolling, in particular to a method for acquiring a rolling evolution process of large inclusions in a casting blank.
Background
In the prior art, the surface defects of the strip steel are mostly caused by large inclusions in a casting blank, such as bubbles, casting powder and alumina inclusions; however, it is often difficult to capture and observe large inclusions in a cast slab in a solid state by using conventional analysis and detection means. Meanwhile, the production process of the automobile steel plate has long flow and many process control points, and the surface quality problem of the later process is more complicated, so that the morphology characteristic of large inclusion genetic defects of casting blanks is difficult to accurately master. A research method capable of accurately identifying the large-scale inclusion genetic defects of the casting blank and establishing the relationship between the surface defects and the sizes and the depths of bubbles, covering slag and alumina inclusions in the casting blank is needed.
Disclosure of Invention
The invention provides a method for acquiring a rolling evolution process of large inclusions in a casting blank, which solves the technical problem that the evolution process of large inclusions in the casting blank is difficult to acquire in the prior art.
In order to solve the technical problem, the invention provides a method for acquiring a rolling evolution process of large inclusions in a casting blank, which comprises the following steps:
forming a groove on a casting blank, filling inclusions in the groove, and then plugging the groove by adopting a material which is the same as the casting blank;
and rolling the casting blank to produce, and tracking and acquiring the macroscopic morphology and the defect size of the surface defect at the groove position.
Further, the inclusions include: air.
Further, the inclusions include: and (4) protecting slag.
Further, the inclusions include: and (4) nozzle nodulation.
Further, the step of forming the groove in the casting blank includes:
and a plurality of grooves are sequentially arranged on the casting blank at equal intervals along the length direction to form a first row of grooves.
Further, the forming of the groove in the casting blank further comprises:
arranging a plurality of rows of grooves parallel to the first row of grooves on the casting blank at equal intervals in sequence along the width direction to form a groove array;
in the groove array, the specifications of each row of grooves along the width direction are different or the plugging depth is different.
Further, in the length direction, the distance between the adjacent grooves is 500 mm;
in the width direction, the distance between the adjacent grooves is 100 mm.
Further, the plugging the groove with a material that is homogenous to the cast slab comprises:
embedding a steel bar which is the same as the casting blank into the groove, and hammering the steel bar to be solid;
and welding the surface of the hammered groove.
Further, the diameter of the steel bar is larger than that of the groove, and the maximum difference value is smaller than or equal to 2 mm;
the length of the steel bar is smaller than the depth of the groove.
Further, the acquiring the macro morphology and the defect size of the surface defect at the groove position comprises:
the full view of the surface defects of the steel sheet was photographed with a digital camera and the width W of the linear defects was measured.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
according to the method for acquiring the rolling evolution process of the large inclusions in the casting blank, grooves with different diameters and depths are drilled in a mode of being perpendicular to the surface of the casting blank, casting powder or water gap nodulation materials are not filled or filled in the holes, slab bubbles or casting blank casting powder or casting blank alumina inclusions are simulated, rolling production is carried out after blocking, the occurrence condition of surface defects of a hot rolled plate and a cold rolled plate at the positions of the sealing holes is tracked, the macroscopic appearance of the surface defects of the steel plate is observed, and the size of the defects is measured; therefore, through defect prefabrication, rolling tracking and analysis verification, the inheritance of bubbles, covering slag and alumina inclusions with different sizes and depths in the casting blank can be determined, and the relationship between the defect and the inclusion size and depth of the bubbles, the covering slag and the alumina in the casting blank is accurately established, so that the improvement and optimization of continuous casting and cleaning technology are guided.
Detailed Description
The embodiment of the application provides a method for acquiring the rolling evolution process of large inclusions in a casting blank, and solves the technical problem that the evolution process of the large inclusions in the casting blank is difficult to acquire in the prior art.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the description and the specific embodiments, and it should be understood that the specific features in the examples and the examples of the present invention are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features in the examples and the examples of the present application may be combined with each other without conflict.
A method for acquiring a rolling evolution process of large inclusions in a casting blank comprises the following steps:
forming a groove on a casting blank, filling inclusions in the groove, and then plugging the groove by adopting a material which is the same as the casting blank;
and rolling the casting blank to produce, and tracking and acquiring the macroscopic morphology and the defect size of the surface defect at the groove position.
Further, the inclusions include: air, simulating slab bubbles. The inclusions include: and (4) covering slag, namely simulating casting blank covering slag. The inclusions include: the nozzle is nodulated, and the aluminum oxide of a casting blank is simulated.
The step of forming the groove on the casting blank comprises the following steps: sequentially arranging a plurality of grooves at equal intervals along the length direction on the casting blank to form a first row of grooves; arranging a plurality of rows of grooves parallel to the first row of grooves on the casting blank at equal intervals in sequence along the width direction to form a groove array; in the groove array, the specifications of each row of grooves along the width direction are different or the plugging depth is different.
Further, in the length direction, the distance between the adjacent grooves is 500 mm; in the width direction, the distance between the adjacent grooves is 100 mm.
Further, the plugging the groove with a material that is homogenous to the cast slab comprises: embedding a steel bar which is the same as the casting blank into the groove, and hammering the steel bar to be solid; and welding the surfaces of the hammered grooves, specifically slightly burning the surfaces by a flame cleaning gun, and reciprocating the surfaces at a certain inclination angle and speed for several times.
Further, the diameter of the steel bar is larger than that of the groove, and the maximum difference value is smaller than or equal to 2 mm;
the length of the steel bar is smaller than the depth of the groove.
Further, the acquiring the macro morphology and the defect size of the surface defect at the groove position comprises:
the full view of the surface defects of the steel sheet was photographed with a digital camera and the width W of the linear defects was measured.
The following will be specifically described by way of an example.
Selecting an ultra-low carbon IF steel casting blank with the specification of 230 x 1300 x 10000 mm.
And drilling a row of 10 grooves at the interval of 500mm in the length direction of the tail part of the casting blank by using a magnetic drill, wherein the interval is 100mm transversely.
Wherein the first row of grooves is
Sealing steel bar
The second row of grooves is
Sealing steel bar
The third row of grooves is
Sealing steel bar
The fourth row of grooves is
Sealing steel bar
The fifth row of grooves is
And (4) not sealing.
The grooves are not filled with covering slag and aluminum oxide, each groove is plugged by a corresponding steel bar, and the surfaces of the sealed grooves are welded by a handheld flame gun to simulate bubbles of casting blanks.
The block casting blank is subjected to hot rolling and cold rolling production along with rolling plan arrangement, surface defects of a hot rolled plate and a cold rolled plate are tracked, photographed and measured, and evolution of casting blank bubbles in the rolling process is researched.
As a result of the tracking, it is possible to track,
including an upper edge 5mm and 8mm from the surface,
No defects were generated in the open pores. While
The bubbles with the upper edge 5mm away from the surface (namely the sealing steel bar is 5mm high) are exposed on the hot rolled plate to form willow leaf-shaped bubbles with wide middle and closed two ends, and the widest position of the defect is 5 mm;
the bubbles with the upper edge 8mm away from the surface (namely the height of the sealing steel bar is 8mm) are exposed on the cold-rolled sheet to form bubble defects with closed ends, and the widest part of the defects is 5 mm. By way of exampleThe introduction method can be used for determining the inheritance of bubbles, covering slag and alumina inclusions with different sizes and depths in the casting blank and accurately establishing the relation between the defects and the sizes and depths of the bubbles, the covering slag and the alumina inclusions in the casting blank so as to guide the improvement and optimization of continuous casting and cleaning technology.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
according to the method for acquiring the rolling evolution process of the large inclusions in the casting blank, grooves with different diameters and depths are drilled in a mode of being perpendicular to the surface of the casting blank, casting powder or water gap nodulation materials are not filled or filled in the holes, slab bubbles or casting blank casting powder or casting blank alumina inclusions are simulated, rolling production is carried out after blocking, the occurrence condition of surface defects of a hot rolled plate and a cold rolled plate at the positions of the sealing holes is tracked, the macroscopic appearance of the surface defects of the steel plate is observed, and the size of the defects is measured; therefore, through defect prefabrication, rolling tracking and analysis verification, the inheritance of bubbles, covering slag and alumina inclusions with different sizes and depths in the casting blank can be determined, and the relationship between the defect and the inclusion size and depth of the bubbles, the covering slag and the alumina in the casting blank is accurately established, so that the improvement and optimization of continuous casting and cleaning technology are guided.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. The method for acquiring the rolling evolution process of the large inclusions in the casting blank is characterized by comprising the following steps of:
forming a groove on a casting blank, filling inclusions in the groove, and then plugging the groove by adopting a material which is the same as the casting blank;
and rolling the casting blank to produce, and tracking and acquiring the macroscopic morphology and the defect size of the surface defect at the groove position.
2. The method for acquiring the rolling evolution process of the large inclusions inside the casting blank according to claim 1, wherein the inclusions comprise: air.
3. The method for acquiring the rolling evolution process of the large inclusions inside the casting blank according to claim 1, wherein the inclusions comprise: and (4) protecting slag.
4. The method for acquiring the rolling evolution process of the large inclusions inside the casting blank according to claim 1, wherein the inclusions comprise: and (4) nozzle nodulation.
5. The method for obtaining the rolling evolution process of the large inclusions in the casting blank according to claim 1, wherein the step of forming the groove in the casting blank comprises the steps of:
and a plurality of grooves are sequentially arranged on the casting blank at equal intervals along the length direction to form a first row of grooves.
6. The method for obtaining the rolling evolution process of the large inclusions in the casting blank according to claim 5, wherein the step of forming the groove in the casting blank further comprises the steps of:
arranging a plurality of rows of grooves parallel to the first row of grooves on the casting blank at equal intervals in sequence along the width direction to form a groove array;
in the groove array, the specifications of each row of grooves along the width direction are different or the plugging depth is different.
7. The method for acquiring the rolling evolution process of the large inclusions in the casting blank according to claim 6, wherein the method comprises the following steps:
in the length direction, the distance between the adjacent grooves is 500 mm;
in the width direction, the distance between the adjacent grooves is 100 mm.
8. The method for obtaining large inclusion roll evolution process inside a casting billet according to claim 1, wherein the blocking of the groove with a material homogeneous with the casting billet comprises:
embedding a steel bar which is the same as the casting blank into the groove, and hammering the steel bar to be solid;
and welding the surface of the hammered groove.
9. The method for acquiring the rolling evolution process of the large inclusions in the casting blank according to claim 8, wherein the diameter of the steel bar is larger than that of the groove, and the maximum difference is less than or equal to 2 mm;
the length of the steel bar is smaller than the depth of the groove.
10. The method for acquiring the rolling evolution process of the large inclusions in the casting blank according to claim 1, wherein the acquiring the macro morphology and the defect size of the surface defects at the groove positions comprises:
the full view of the surface defects of the steel sheet was photographed with a digital camera and the width W of the linear defects was measured.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010749671.3A CN111912855A (en) | 2020-07-30 | 2020-07-30 | Method for acquiring rolling evolution process of large inclusions in casting blank |
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| CN202010749671.3A CN111912855A (en) | 2020-07-30 | 2020-07-30 | Method for acquiring rolling evolution process of large inclusions in casting blank |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113109439A (en) * | 2021-04-23 | 2021-07-13 | 北京领示科技有限公司 | Method for preparing inclusion defects with controllable size and position in metal material |
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2020
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| US5413269A (en) * | 1991-12-18 | 1995-05-09 | Equipos Nucleares, S.A. | Method to implant defects in a metallic component |
| CN102495133A (en) * | 2011-12-12 | 2012-06-13 | 北京科技大学 | Quantitative analysis method for distribution of large impurities in casting blank |
| CN105643133A (en) * | 2014-09-28 | 2016-06-08 | 中国海洋石油总公司 | Manufacturing method for pipeline circumferential weld artificial defect |
| CN108918219A (en) * | 2018-06-30 | 2018-11-30 | 武汉冶钢结构有限责任公司 | The preparation method of non-destructive testing with dreg defect weld seam simulating test pieces |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113109439A (en) * | 2021-04-23 | 2021-07-13 | 北京领示科技有限公司 | Method for preparing inclusion defects with controllable size and position in metal material |
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Application publication date: 20201110 |