CN114682876A - Production method for improving cutting quality of large-thickness alloy steel plate - Google Patents
Production method for improving cutting quality of large-thickness alloy steel plate Download PDFInfo
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- CN114682876A CN114682876A CN202210177301.6A CN202210177301A CN114682876A CN 114682876 A CN114682876 A CN 114682876A CN 202210177301 A CN202210177301 A CN 202210177301A CN 114682876 A CN114682876 A CN 114682876A
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- steel plate
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- temperature
- alloy steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
- B23K7/002—Machines, apparatus, or equipment for cutting plane workpieces, e.g. plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
- B23K7/10—Auxiliary devices, e.g. for guiding or supporting the torch
Abstract
The invention relates to a production method for improving the cutting quality of a large-thickness alloy steel plate, belonging to the technical field of plate rolling in the metallurgical industry. The technical scheme is as follows: the method comprises the following steps: (1) heating the steel plate to the temperature of 620 ℃ and 660 ℃, preserving the heat for 60-100min, cooling to the temperature of 250 ℃ and 270 ℃, and discharging; (2) naturally cooling the steel plate to the temperature of 180-210 ℃ after the steel plate is taken out of the furnace, and then starting cutting at the cutting speed of 0.08-0.1 m/min; (3) and covering the cut steel plate with heat insulation cotton for heat insulation for 5-10 h. The invention has the beneficial effects that: the cutting quality of the alloy steel plate with the large thickness of 120-200mm can be improved, and the defects of blasting, sawtooth, cutting cracks and the like are reduced.
Description
Technical Field
The invention relates to a production method for improving the cutting quality of a large-thickness alloy steel plate, and belongs to the technical field of section rolling in the metallurgical industry.
Background
The large-thickness alloy steel plate has good corrosion resistance, normal-temperature and high-temperature tensile properties and low-temperature impact properties due to the fact that the large-thickness alloy steel plate contains elements such as Cr and Mo, and is commonly used for manufacturing petrochemical equipment such as hydrogenation reactors, hot high-pressure separators, methanol synthesis towers and the like. In the using process of the steel plate, the steel plate is cut into small workpieces, or is pressed into end sockets, or is processed into cylindrical sections through rolling, rounding, welding and the like, and the cutting quality of the edge of the steel plate has great influence on the processing quality of the steel plate in the later period no matter which processing mode is adopted. Therefore, users often require good cutting quality of the steel sheet in terms of control of the profile of the steel sheet appearance.
For a steel plate, at present, more advanced cutting processes include plasma cutting, water flow cutting, laser cutting and the like, and are mainly applied to thin-specification steel plate processing, and a traditional cutting method includes flame cutting and shearing. For a steel plate with the thickness of 120-200mm, plasma cutting, water flow cutting, laser cutting and shearing modes cannot be adopted, and only flame cutting can be adopted. When the steel plate is cut by flame, blasting, saw teeth and the like are easy to generate due to internal defects of the steel plate, improper control of gas pressure and proportion and the likeCutting crack, wherein the number of the cutting crack can be as high as 8-20/m2The length of the crack is 7-15mm, the depth of the crack is 3-10mm, and the cutting quality is seriously influenced.
Disclosure of Invention
The invention aims to provide a production method for improving the cutting quality of a large-thickness alloy steel plate, which can improve the cutting quality of the large-thickness alloy steel plate of 120-200mm, reduce the defects of blasting, sawtooth, cutting cracks and the like, and solve the problems in the background technology.
The technical scheme of the invention is as follows:
a production method for improving the cutting quality of a large-thickness alloy steel plate is operated according to the following steps:
(1) heating the steel plate to the temperature of 620 ℃ and 660 ℃, preserving the heat for 60-100min, cooling to the temperature of 250 ℃ and 270 ℃, and discharging;
(2) naturally cooling the steel plate to the temperature of 180-210 ℃ after the steel plate is taken out of the furnace, and then starting cutting at the cutting speed of 0.08-0.1 m/min;
(3) and covering the cut steel plate with heat insulation cotton for heat insulation for 5-10 h.
In the step (2), the steel plate is cut by adopting natural gas flame, wherein the natural gas pressure is 0.03-0.04MPa, and the oxygen pressure is 0.5-0.7 MPa.
In the step (3), the steel plate is cut after heat preservation, and the cracks at the cutting position are 1-3 per meter2The length of the crack is 1-5mm, and the depth is 0.1-1 mm.
The thickness of the steel plate is 120-200 mm.
By adopting the invention, the steel plate is heated before being cut, so that the internal stress of the steel plate can be reduced, and the cutting cracks caused by the stress can be reduced; the stress of the cut steel plate can be further reduced by heat preservation after the steel plate is cut, and cracks are controlled; the pressure and pressure fluctuation of natural gas and oxygen in the steel plate cutting process are controlled, and the cutting defects of cutting blasting, saw teeth and the like can be effectively reduced.
The invention has the beneficial effects that: 1) the thickness of the steel plate is 120-200 mm; 2) the edge of the cut steel plate has no blasting, sawtooth and visible crack defects; 3) the magnetic powder inspection is adopted to detect the cutting edge, and 1-3 cracks/m can be detected2Length of crack1-5mm and 0.1-1mm in depth, compared with the background technology, the number of cracks is obviously reduced, and the length and the depth of the cracks are obviously reduced.
Detailed Description
A production method for improving the cutting quality of a large-thickness alloy steel plate is operated according to the following steps:
(1) heating the steel plate to the temperature of 620 ℃ and 660 ℃, preserving the heat for 60-100min, cooling to the temperature of 250 ℃ and 270 ℃, and discharging;
(2) naturally cooling the steel plate out of the furnace to the temperature of 180-210 ℃, and then starting cutting at the cutting speed of 0.08-0.1 m/min;
(3) and covering the cut steel plate with heat insulation cotton for heat insulation for 5-10 h.
In this embodiment, for a large-thickness alloy steel plate production enterprise, the production process of the large-thickness alloy steel plate comprises smelting, pouring, rolling, cooling, cutting and heat treatment. In the process of casting the steel ingot, the temperature of the riser is controlled to be within the range of 50-80 ℃/h, so that the composition segregation can be effectively transferred to the riser, the composition segregation of the ingot body is improved, and the cutting defect caused by the composition segregation is reduced after the steel ingot is rolled into a steel plate. In addition, after the steel plate is cut and insulated, heat treatment is carried out according to the standard or the requirement of a client. For users of large-thickness alloy steel plates, the steel plates can be directly transferred to the next process after being cut.
Examples 1-8 the steel sheet compositions and their contents are shown in table 1; the heating temperature, the heat preservation time and the tapping temperature before the steel plate is cut are shown in the table 2; the cutting temperature, cutting speed, natural gas pressure and oxygen pressure in the steel plate cutting process are shown in table 3; the thickness of the steel plate, the edge quality and the magnetic powder flaw detection crack condition are shown in Table 4.
TABLE 1
TABLE 2
TABLE 3
TABLE 4
As can be seen from Table 4, when the cut edges are detected by magnetic particle inspection, the number of cracks is obviously reduced and the length and depth of the cracks are obviously reduced compared with the background technology.
Claims (4)
1. A production method for improving the cutting quality of a large-thickness alloy steel plate is characterized by comprising the following steps: the method comprises the following steps:
(1) heating the steel plate to the temperature of 620 ℃ and 660 ℃, preserving the heat for 60-100min, cooling to the temperature of 250 ℃ and 270 ℃, and discharging;
(2) naturally cooling the steel plate to the temperature of 180-210 ℃ after the steel plate is taken out of the furnace, and then starting cutting at the cutting speed of 0.08-0.1 m/min;
(3) and covering the cut steel plate with heat insulation cotton for heat insulation for 5-10 h.
2. The production method for improving the cutting quality of the large-thickness alloy steel plate according to claim 1, characterized by comprising the following steps of: in the step (2), the steel plate is cut by adopting natural gas flame, wherein the natural gas pressure is 0.03-0.04MPa, and the oxygen pressure is 0.5-0.7 MPa.
3. The production method for improving the cutting quality of the large-thickness alloy steel plate according to claim 1, characterized by comprising the following steps of: in the step (3), the steel plate is cut after heat preservation, and the cracks at the cutting position are 1-3 per meter2The length of the crack is 1-5mm, and the depth is 0.1-1 mm.
4. The production method for improving the cutting quality of the large-thickness alloy steel plate according to claim 1, characterized by comprising the following steps of: the thickness of the steel plate is 120-200 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210177301.6A CN114682876A (en) | 2022-02-25 | 2022-02-25 | Production method for improving cutting quality of large-thickness alloy steel plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210177301.6A CN114682876A (en) | 2022-02-25 | 2022-02-25 | Production method for improving cutting quality of large-thickness alloy steel plate |
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| CN114682876A true CN114682876A (en) | 2022-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210177301.6A Pending CN114682876A (en) | 2022-02-25 | 2022-02-25 | Production method for improving cutting quality of large-thickness alloy steel plate |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102528210A (en) * | 2011-12-30 | 2012-07-04 | 中信重工机械股份有限公司 | Torch-flame cutting process for super-thick steel plates |
| CN103170704A (en) * | 2013-03-16 | 2013-06-26 | 南阳汉冶特钢有限公司 | Flame cutting process of steel plate of extremely thick medium and high carbon steel and alloy steel |
| CN107267848A (en) * | 2017-05-26 | 2017-10-20 | 舞阳钢铁有限责任公司 | One kind reduces that electroslag becomes a useful person Cr Mo steel crackles and edge bursts method |
| CN109894812A (en) * | 2019-02-13 | 2019-06-18 | 舞阳钢铁有限责任公司 | A kind of method of small substance blank production Cr-Mo steel plate |
| CN111020142A (en) * | 2019-12-23 | 2020-04-17 | 舞阳钢铁有限责任公司 | Cogging and slow cooling process for Cr-Mo steel blank |
-
2022
- 2022-02-25 CN CN202210177301.6A patent/CN114682876A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102528210A (en) * | 2011-12-30 | 2012-07-04 | 中信重工机械股份有限公司 | Torch-flame cutting process for super-thick steel plates |
| CN103170704A (en) * | 2013-03-16 | 2013-06-26 | 南阳汉冶特钢有限公司 | Flame cutting process of steel plate of extremely thick medium and high carbon steel and alloy steel |
| CN107267848A (en) * | 2017-05-26 | 2017-10-20 | 舞阳钢铁有限责任公司 | One kind reduces that electroslag becomes a useful person Cr Mo steel crackles and edge bursts method |
| CN109894812A (en) * | 2019-02-13 | 2019-06-18 | 舞阳钢铁有限责任公司 | A kind of method of small substance blank production Cr-Mo steel plate |
| CN111020142A (en) * | 2019-12-23 | 2020-04-17 | 舞阳钢铁有限责任公司 | Cogging and slow cooling process for Cr-Mo steel blank |
Non-Patent Citations (1)
| Title |
|---|
| 《实用数控加工技术》编委会: "实用数控加工技术", 江西科学技术出版社, pages: 351 - 353 * |
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