CN110586648B - Anti-weld crack rolling method for high-carbon equivalent composite blank - Google Patents
Anti-weld crack rolling method for high-carbon equivalent composite blank Download PDFInfo
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- CN110586648B CN110586648B CN201910844402.2A CN201910844402A CN110586648B CN 110586648 B CN110586648 B CN 110586648B CN 201910844402 A CN201910844402 A CN 201910844402A CN 110586648 B CN110586648 B CN 110586648B
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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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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- 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
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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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
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Abstract
The invention relates to a welding seam cracking-preventing rolling method for a high-carbon equivalent composite blank, which comprises the following steps of: 1) after the vacuum composite blank is broken, conveying the composite blank to a resistance heating furnace for heating; 2) heating the composite blank in a chamber furnace; 3) the composite blank is delivered out of the chamber type furnace and then sent to a roller way, and is rolled after being descaled; ensuring that the warping degree of the whole plate is less than or equal to 100mm in the rolling process; the roughing mill adopts a low rolling line, low speed and constant speed rolling. By adopting the rolling method, the problem that the welding line is easy to crack when the high-carbon equivalent composite plate blank is rolled can be thoroughly solved, the rolling stability and success rate are greatly improved, and the equipment damage risk is reduced.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to a welding seam cracking prevention rolling method for a high-carbon equivalent composite blank.
Background
Because the high-carbon steel laminated rolling blank has high welding difficulty and low welding seam strength, the high-carbon steel laminated rolling blank is easy to crack or generate cracks under the influence of cutting stress during biting during rolling, and the interface bonding rate of a vacuum composite blank bonding surface is basically zero after the cracks are generated.
Disclosure of Invention
The invention provides a welding seam cracking prevention rolling method for a high-carbon equivalent composite blank, which can thoroughly solve the problem that a welding seam is easy to crack when the high-carbon equivalent composite blank is rolled, greatly improves the rolling stability and success rate, and reduces the risk of equipment damage.
In order to achieve the purpose, the invention adopts the following technical scheme:
the welding seam cracking preventing rolling method of the high-carbon equivalent composite blank comprises the following steps that the carbon equivalent of the high-carbon equivalent composite blank is more than or equal to 0.4 percent; the rolling method comprises the following steps:
1) after the vacuum composite blank is broken, conveying the composite blank to a resistance heating furnace for heating at the temperature of 280-320 ℃ for 1-1.5 h, at the temperature of 380-420 ℃ for 1-1.5 h, and at the temperature of 480-520 ℃ for 1-1.5 h;
2) taking out the composite blank, putting the composite blank into a chamber furnace for heating, and covering a layer of plain carbon steel cold-rolled plate with the thickness of 0.8-1.2 mm on the upper surface of the composite blank before the composite blank is put into the furnace; the composite blank is subjected to a heating process of sectional heating, the temperature is kept for 5-7 h at a temperature section below 700 ℃, 6-9 h at a temperature section of 700-1230 ℃, and 7-12 h at a soaking section of 1200 +/-20 ℃; preheating the composite blank in a chamber furnace at least at 650-750 ℃ for more than 12 hours or continuously producing other products for more than 24 hours before the composite blank is put into the chamber furnace; when the composite blank is heated in a chamber furnace, the temperature difference between the upper surface and the lower surface of the composite blank is controlled within 50 ℃, and a lower blow-off valve is opened and blows air to the lower surface 1 hour before the composite blank is discharged from the furnace;
3) the composite blank is delivered to a roller way after being taken out of the chamber type furnace, and is rolled after being descaled, and the warping degree of the whole plate is ensured to be less than or equal to 100mm in the rolling process; the roughing mill rolls at a low rolling line, a low speed and a constant speed, the actual rolling line height is reduced to the roller surface height plus (10-30) mm, and the biting speed is set to be 0.8-1.2 m/s; the rough rolling mill adopts small reduction for the first pass, and the reduction is limited within 15 mm; the first two times adopt a reverse dog bone rolling method, namely: and lifting the roll gap for 2-4 mm after biting, and gradually pressing down and returning to the original roll gap when throwing.
Compared with the prior art, the invention has the beneficial effects that:
by adopting the rolling method, the problem that the welding line is easy to crack when the high-carbon equivalent composite plate blank is rolled can be thoroughly solved, the rolling stability and success rate are greatly improved, and the equipment damage risk is reduced.
Detailed Description
According to the welding seam cracking-preventing rolling method for the high-carbon-equivalent composite blank, the carbon equivalent of the high-carbon-equivalent composite blank is more than or equal to 0.4%; the rolling method comprises the following steps:
1) after the vacuum composite blank is broken, conveying the composite blank to a resistance heating furnace for heating at the temperature of 280-320 ℃ for 1-1.5 h, at the temperature of 380-420 ℃ for 1-1.5 h, and at the temperature of 480-520 ℃ for 1-1.5 h;
2) taking out the composite blank, putting the composite blank into a chamber furnace for heating, and covering a layer of plain carbon steel cold-rolled plate with the thickness of 0.8-1.2 mm on the upper surface of the composite blank before the composite blank is put into the furnace; the composite blank is subjected to a heating process of sectional heating, the temperature is kept for 5-7 h at a temperature section below 700 ℃, 6-9 h at a temperature section of 700-1230 ℃, and 7-12 h at a soaking section of 1200 +/-20 ℃; preheating the composite blank in a chamber furnace at least at 650-750 ℃ for more than 12 hours or continuously producing other products for more than 24 hours before the composite blank is put into the chamber furnace; when the composite blank is heated in a chamber furnace, the temperature difference between the upper surface and the lower surface of the composite blank is controlled within 50 ℃, and a lower blow-off valve is opened and blows air to the lower surface 1 hour before the composite blank is discharged from the furnace;
3) the composite blank is delivered to a roller way after being taken out of the chamber type furnace, and is rolled after being descaled, and the warping degree of the whole plate is ensured to be less than or equal to 100mm in the rolling process; the roughing mill rolls at a low rolling line, a low speed and a constant speed, the actual rolling line height is reduced to the roller surface height plus (10-30) mm, and the biting speed is set to be 0.8-1.2 m/s; the rough rolling mill adopts small reduction for the first pass, and the reduction is limited within 15 mm; the first two times adopt a reverse dog bone rolling method, namely: and lifting the roll gap for 2-4 mm after biting, and gradually pressing down and returning to the original roll gap when throwing.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ examples ] A method for producing a compound
The AGMJ45 product is produced in 2019, a blank with the slab number of 9N2678F011 and the size of 485mm (thickness) multiplied by 2200mm (width) multiplied by 3460 (length) is adopted, and the rolled finished product has the slab number of B9601D010000 and the size of 330mm (thickness) multiplied by 2200 (width) multiplied by L (length).
The heating process comprises the following steps:
after the vacuum composite blank is broken, conveying the composite blank to a resistance heating furnace, and setting the temperature to be 300 ℃ for heating for 1h, 400 ℃ for heating for 1h and 500 ℃ for heating for 1 h; taking out the composite blank, putting the composite blank into a chamber furnace for heating, and covering a layer of plain carbon steel cold-rolled plate with the thickness of 1.0mm on the upper surface of the composite blank before the composite blank is put into the furnace. The composite blank is subjected to a heating process of sectional heating, the temperature is kept for 6 hours at a temperature section below 700 ℃, for 7 hours at a temperature section of 700-1230 ℃, and for 9 hours at a soaking section of 1200 +/-20 ℃; the composite blank is preheated for 12 hours in a chamber type furnace front chamber type furnace at 700 ℃.
When the chamber furnace is heated, the temperature difference between the upper surface and the lower surface of the composite blank is controlled according to 50 ℃, the lower relief valve is opened 1 hour before the composite blank is discharged out of the furnace, and air is blown to the lower surface; when the composite blank is sent into the roller way, the composite blank must be descaled by a descaling box, and the descaling quality is ensured.
The rolling process is as follows:
and the warping degree of the whole plate is ensured to be less than or equal to 100mm in the rolling process, otherwise, the joint surface is cracked due to overlarge shear stress, and if the warping degree of the whole plate exceeds the upper limit, the rolling is continued after the whole plate is rolled off and flat.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (1)
1. The welding seam cracking preventing rolling method of the high-carbon equivalent composite blank comprises the following steps that the carbon equivalent of the high-carbon equivalent composite blank is more than or equal to 0.4 percent; the rolling method is characterized by comprising the following steps:
1) after the vacuum composite blank is broken, conveying the composite blank to a resistance heating furnace for heating at the temperature of 280-320 ℃ for 1-1.5 h, at the temperature of 380-420 ℃ for 1-1.5 h, and at the temperature of 480-520 ℃ for 1-1.5 h;
2) taking out the composite blank, putting the composite blank into a chamber furnace for heating, and covering a layer of plain carbon steel cold-rolled plate with the thickness of 0.8-1.2 mm on the upper surface of the composite blank before the composite blank is put into the furnace; the composite blank is subjected to a heating process of sectional heating, the temperature is kept for 5-7 h at a temperature section below 700 ℃, 6-9 h at a temperature section of 700-1230 ℃, and 7-12 h at a soaking section of 1200 +/-20 ℃; preheating the composite blank in a chamber furnace for more than 12 hours at the temperature of 650-750 ℃ or continuously producing other products for more than 24 hours before the composite blank is put into the chamber furnace; when the composite blank is heated in a chamber furnace, the temperature difference between the upper surface and the lower surface of the composite blank is controlled within 50 ℃, and a lower blow-off valve is opened and blows air to the lower surface 1 hour before the composite blank is discharged from the furnace;
3) the composite blank is delivered to a roller way after being taken out of the chamber type furnace, and is rolled after being descaled, and the warping degree of the whole plate is ensured to be less than or equal to 100mm in the rolling process; the roughing mill rolls at a low rolling line, a low speed and a constant speed, the actual rolling line height is reduced to the roller surface height plus (10-30) mm, and the biting speed is set to be 0.8-1.2 m/s; the rough rolling mill adopts small reduction for the first pass, and the reduction is limited within 15 mm; the first two times adopt a reverse dog bone rolling method, namely: and lifting the roll gap for 2-4 mm after biting, and gradually pressing down and returning to the original roll gap when throwing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910844402.2A CN110586648B (en) | 2019-09-06 | 2019-09-06 | Anti-weld crack rolling method for high-carbon equivalent composite blank |
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| CN201910844402.2A CN110586648B (en) | 2019-09-06 | 2019-09-06 | Anti-weld crack rolling method for high-carbon equivalent composite blank |
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| CN110586648B true CN110586648B (en) | 2021-04-02 |
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| CN111482457B (en) * | 2020-04-08 | 2022-02-15 | 鞍钢股份有限公司 | Thin material rolling method for high-carbon steel tandem rolling blank |
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| JP4926447B2 (en) * | 2005-05-13 | 2012-05-09 | 新日本製鐵株式会社 | Manufacturing method of high strength steel with excellent weld crack resistance |
| CN103028897A (en) * | 2011-09-29 | 2013-04-10 | 鞍钢股份有限公司 | Manufacture method for cold-crack and high sensibility ultra-thick steel plate |
| CN103302097A (en) * | 2013-06-29 | 2013-09-18 | 济钢集团有限公司 | Method for rolling carbon steel and low alloy steel large-piece-weight extra thick composite blank |
| CN105057355A (en) * | 2015-07-29 | 2015-11-18 | 洛阳双瑞精铸钛业有限公司 | Method for reducing surface cracks of titanium alloy boards after heating once and rolling |
| CN109128714B (en) * | 2018-10-13 | 2020-04-10 | 山东盛阳金属科技股份有限公司 | Hot continuous rolling large-scale preparation method of stainless steel-carbon steel composite plate |
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