CN111940506A - Method for eliminating surface defects of high-carbon steel billet casting blank - Google Patents
Method for eliminating surface defects of high-carbon steel billet casting blank Download PDFInfo
- Publication number
- CN111940506A CN111940506A CN202010618045.0A CN202010618045A CN111940506A CN 111940506 A CN111940506 A CN 111940506A CN 202010618045 A CN202010618045 A CN 202010618045A CN 111940506 A CN111940506 A CN 111940506A
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- Prior art keywords
- casting blank
- casting
- carbon steel
- defects
- billet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention aims to provide a method for eliminating surface defects of carbon steel billets, which comprises the steps of pretreating the surface of a straightened casting blank by adopting high-pressure water, carrying out hollow stacking slow cooling on the pretreated casting blank, controlling the atmosphere of a heating furnace, the time of the casting blank in the furnace and the like, increasing the thickness depth of an oxide layer on the surface of the casting blank, wrapping most of fine defects on the surface of the casting blank in the oxide layer on the surface of the casting blank, removing the micro quality defects on the surface of the casting blank in a manner of removing iron scales on the surface of the casting blank, and avoiding the generation of surface scab defects of wires in the rolling process.
Description
Field of the structure
The invention belongs to the technical field of steel making, and particularly relates to a method for eliminating surface defects of a small square billet casting blank of high-carbon steel.
Background
The high-carbon 82B hot-rolled wire rod is a main raw material in the metal product industry and is used for producing prestressed steel wires and steel strands with high strength and low relaxation. The large-size and high-strength prestressed steel strand produced by the hard wire rod is widely applied to important projects such as highways, railways, long-span bridges, deepwater wharves and the like, and the safety coefficient of the buildings can be effectively improved.
In the production process of the small square billet high-carbon steel, fine surface cracks are inevitably formed on the surface of a casting blank due to various reasons such as slag entrapment, vibration marks on the surface of the casting blank and uneven secondary cooling, the defects are gradually exposed along with the extension and refinement of a rolled piece after multi-pass rolling to form surface scars of a wire rod, and the scars can deteriorate the drawing performance of the high-carbon wire rod, so that the wire rod is abnormally broken at the scars during drawing, and further deep processing production is influenced.
In order to reduce the formation of surface scabs of wires, high-carbon steel billet blanks are usually subjected to mechanical grinding or shot blasting treatment to eliminate surface quality defects, and although the methods can effectively remove the surface quality defects within 1-2mm of the surface of a casting blank, the methods have the problems of complex treatment process, low production efficiency and the like.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for eliminating surface defects of a billet of high carbon steel, which solves the disadvantages of the prior art.
The technical scheme adopted by the invention is as follows:
the method for eliminating the surface defects of the casting blank of the high-carbon steel billet is characterized by comprising the following steps of:
s1: after the casting blank is taken out of the withdrawal and straightening machine, high-pressure water pretreatment is carried out on a casting roller way of a continuous casting machine to remove various substances such as iron scales, crystallizer covering slag and the like attached to the surface of the casting blank, and the surface temperature of the casting blank is maintained at 850-950 ℃;
s2, stacking and slowly cooling the casting blank pretreated by the high-pressure water in a slow cooling pit, wherein the casting blank adopts a hollow stacking mode in the cooling process of the slow cooling pit to ensure that the casting blank is fully contacted with air, and the temperature of the slowly cooled casting blank is maintained below 400 ℃;
s3: stacking the casting blanks after slow cooling, and removing iron oxide scales on the surfaces of the casting blanks by using a mechanical steel brush roller;
s4: the casting blank is heated again in weak oxidizing atmosphere, the time of the casting blank in the furnace is ensured to be 90-120min, the temperature in the furnace is 950-;
s5, carrying out secondary high-pressure water dephosphorization on the casting blank after heating, removing iron oxide scales formed on the surface of the casting blank, and removing surface quality defects such as micro cracks on the surface of the casting blank;
and S6, after the casting blank is treated by the method, carrying out magnetic powder inspection treatment on the casting blank, wherein no obvious surface defect is found, and no obvious surface defect is found in the subsequent wire rod rolling process, namely the product is qualified.
The method for eliminating the surface defects of the casting blank of the high-carbon steel billet can be further set to have the water pressure of the high-pressure water pretreatment in S1 and S5 of 16-18 MPa.
The method for eliminating the surface defects of the casting blank of the high-carbon steel billet can be further set to ensure that the processing time of the casting blank in the S2 in the slow cooling pit is 28 h.
The method for eliminating the surface defects of the casting blank of the high-carbon steel billet provided by the invention can be further set to control the thickness of the iron scale of the casting blank in the S4 to be about 1-1.3mm when the casting blank is discharged from the heating furnace.
Advantageous effects
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the invention aims to provide a method for eliminating surface defects of a carbon steel intermediate billet, which aims at the production process of a high-carbon steel billet and adopts the modes of carrying out high-pressure water pretreatment on a casting blank, carrying out slow cooling oxidation in a hollow stacking mode, controlling the atmosphere of a heating furnace, controlling the furnace time of the casting blank and the like so as to enhance the surface oxidation degree of the high-carbon steel billet in the production process, increase the thickness of the surface oxide scale of the casting blank, wrapping the quality defects of micro cracks and the like on the surface of the casting blank in the oxide scale with a certain thickness, and realizing the removal of most of the defects of the micro surface in the thickness of 1-2mm on the surface of the casting blank by removing the surface oxide scale of the casting blank, so that the method for eliminating the surface quality defects of the billet effectively improves the surface quality of the billet, inhibits the surface scabs of a wire rod in the rolling process and simultaneously improves the production, the cost of the surface treatment process is reduced.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to various embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention aims to provide a method for eliminating surface defects of a carbon steel intermediate billet, which aims at the production process of a high-carbon steel billet and adopts the modes of carrying out high-pressure water pretreatment on a casting blank, carrying out slow cooling oxidation in a hollow stacking mode, controlling the atmosphere of a heating furnace, controlling the furnace time of the casting blank and the like so as to enhance the surface oxidation degree of the high-carbon steel billet in the production process, increase the thickness of the surface oxide scale of the casting blank, wrapping the quality defects of micro cracks and the like on the surface of the casting blank in the oxide scale with a certain thickness, and realizing the removal of most of the defects of the micro surface in the thickness of 1-2mm on the surface of the casting blank by removing the surface oxide scale of the casting blank, so that the method for eliminating the surface quality defects of the billet effectively improves the surface quality of the billet, inhibits the surface scabs of a wire rod in the rolling process and simultaneously improves the production, the cost of the surface treatment process is reduced.
The invention adopts the following technical scheme:
the method for eliminating the surface defects of the casting blank of the high-carbon steel billet is characterized by comprising the following steps of:
step 1: after the casting blank is taken out of the withdrawal and straightening machine, high-pressure water pretreatment is carried out on a casting roller way of a continuous casting machine, the water pressure is 16-18MPa, the purpose is to remove various substances such as iron oxide scales, crystallizer protecting slag and the like attached to the surface of the casting blank, and the surface temperature of the casting blank is maintained at 850-950 ℃;
step 2, stacking and slowly cooling the casting blank pretreated by the high-pressure water in the slow cooling pit, wherein the casting blank adopts a hollow stacking mode in the cooling process of the slow cooling pit to ensure that the casting blank is fully contacted with air, the processing time of the casting blank in the slow cooling pit is 28 hours to increase the thickness of iron scale, and the temperature of the slowly cooled casting blank is maintained below 400 ℃;
and step 3: stacking the casting blanks after slow cooling, and removing iron oxide scales on the surfaces of the casting blanks by using a mechanical steel brush roller;
and 4, step 4: reheating the casting blank in a weak oxidizing atmosphere, ensuring that the time of the casting blank in the furnace is 90-120min, the temperature in the furnace is 950-;
step 5, carrying out secondary high-pressure water dephosphorization on the casting blank after heating, removing iron oxide scales formed on the surface of the casting blank, and removing surface quality defects such as micro cracks on the surface of the casting blank;
and 6, after the casting blank is treated by the method, carrying out magnetic powder inspection treatment on the casting blank, wherein no obvious surface defect is found, and no obvious surface defect is found in the subsequent wire rod rolling process, namely the product is qualified.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships only for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Claims (4)
1. The method for eliminating the surface defects of the casting blank of the high-carbon steel billet is characterized by comprising the following steps of:
s1: after the casting blank is taken out of the withdrawal and straightening machine, high-pressure water pretreatment is carried out on a casting roller way of a continuous casting machine to remove various substances such as iron scales, crystallizer covering slag and the like attached to the surface of the casting blank, and the surface temperature of the casting blank is maintained at 850-950 ℃;
s2, stacking and slowly cooling the casting blank pretreated by the high-pressure water in a slow cooling pit, wherein the casting blank adopts a hollow stacking mode in the cooling process of the slow cooling pit to ensure that the casting blank is fully contacted with air, and the temperature of the slowly cooled casting blank is maintained below 400 ℃;
s3: stacking the casting blanks after slow cooling, and removing iron oxide scales on the surfaces of the casting blanks by using a mechanical steel brush roller;
s4: the casting blank is heated again in weak oxidizing atmosphere, the time of the casting blank in the furnace is ensured to be 90-120min, the temperature in the furnace is 950-;
s5, carrying out secondary high-pressure water dephosphorization on the casting blank after heating, removing iron oxide scales formed on the surface of the casting blank, and removing surface quality defects such as micro cracks on the surface of the casting blank;
and S6, after the casting blank is treated by the method, carrying out magnetic powder inspection treatment on the casting blank, wherein no obvious surface defect is found, and no obvious surface defect is found in the subsequent wire rod rolling process, namely the product is qualified.
2. The method for eliminating surface defects of a high-carbon steel billet as claimed in claim 1, wherein the water pressure of the high-pressure water pretreatment in S1 and S5 is 16-18 MPa.
3. The method for eliminating surface defects of a billet of high carbon steel as claimed in claim 1, wherein the billet in S2 is treated in a cooling pit for 28 hours.
4. The method for removing surface defects of a billet of a high carbon steel billet as set forth in claim 1, wherein the thickness of the iron oxide scale at the time of exiting the furnace in S4 is controlled to be about 1-1.3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010618045.0A CN111940506A (en) | 2020-07-01 | 2020-07-01 | Method for eliminating surface defects of high-carbon steel billet casting blank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010618045.0A CN111940506A (en) | 2020-07-01 | 2020-07-01 | Method for eliminating surface defects of high-carbon steel billet casting blank |
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| CN111940506A true CN111940506A (en) | 2020-11-17 |
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| CN202010618045.0A Pending CN111940506A (en) | 2020-07-01 | 2020-07-01 | Method for eliminating surface defects of high-carbon steel billet casting blank |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5970594A (en) * | 1995-10-27 | 1999-10-26 | Danieli & C. Officine Meccaniche Spa | Method to roll strip and plate and rolling line which performs such method |
| CN1864878A (en) * | 2005-05-20 | 2006-11-22 | 中冶东方工程技术有限公司 | Compact medium-width strip steel production process |
| CN106086685A (en) * | 2016-08-24 | 2016-11-09 | 武汉钢铁股份有限公司 | By tensile strength >=1500MPa thin hot forming steel and the production method of sheet billet Direct Rolling |
| CN106119692A (en) * | 2016-08-24 | 2016-11-16 | 武汉钢铁股份有限公司 | By the tensile strength of medium thin slab Direct Rolling >=1500MPa hot forming steel and production method |
| CN106435381A (en) * | 2016-11-04 | 2017-02-22 | 南京钢铁股份有限公司 | Manufacturing technique of fiber steel wire rod containing Ti |
| CN106475432A (en) * | 2015-08-31 | 2017-03-08 | 鞍钢股份有限公司 | A kind of high-carbon steel wire rod being suitable to fine steel wire drawing and iron scale control method |
| CN110340146A (en) * | 2018-12-28 | 2019-10-18 | 江苏省沙钢钢铁研究院有限公司 | A kind of method of elimination carbon steel centre blank surface defects |
-
2020
- 2020-07-01 CN CN202010618045.0A patent/CN111940506A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5970594A (en) * | 1995-10-27 | 1999-10-26 | Danieli & C. Officine Meccaniche Spa | Method to roll strip and plate and rolling line which performs such method |
| CN1864878A (en) * | 2005-05-20 | 2006-11-22 | 中冶东方工程技术有限公司 | Compact medium-width strip steel production process |
| CN106475432A (en) * | 2015-08-31 | 2017-03-08 | 鞍钢股份有限公司 | A kind of high-carbon steel wire rod being suitable to fine steel wire drawing and iron scale control method |
| CN106086685A (en) * | 2016-08-24 | 2016-11-09 | 武汉钢铁股份有限公司 | By tensile strength >=1500MPa thin hot forming steel and the production method of sheet billet Direct Rolling |
| CN106119692A (en) * | 2016-08-24 | 2016-11-16 | 武汉钢铁股份有限公司 | By the tensile strength of medium thin slab Direct Rolling >=1500MPa hot forming steel and production method |
| CN106435381A (en) * | 2016-11-04 | 2017-02-22 | 南京钢铁股份有限公司 | Manufacturing technique of fiber steel wire rod containing Ti |
| CN110340146A (en) * | 2018-12-28 | 2019-10-18 | 江苏省沙钢钢铁研究院有限公司 | A kind of method of elimination carbon steel centre blank surface defects |
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Application publication date: 20201117 |
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