CN116765126A - Method for reducing same plate difference of ultra-wide thin high alloy steel plate - Google Patents

Method for reducing same plate difference of ultra-wide thin high alloy steel plate Download PDF

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Publication number
CN116765126A
CN116765126A CN202310766414.4A CN202310766414A CN116765126A CN 116765126 A CN116765126 A CN 116765126A CN 202310766414 A CN202310766414 A CN 202310766414A CN 116765126 A CN116765126 A CN 116765126A
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China
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steel plate
descaling
rolling
alloy steel
ultra
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Pending
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CN202310766414.4A
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Chinese (zh)
Inventor
侯敬超
龙杰
庞辉勇
刘生
马吉力
袁锦程
吴艳阳
牛红星
李样兵
顾自有
岳欣欣
安俊涛
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Wuyang Iron and Steel Co Ltd
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Wuyang Iron and Steel Co Ltd
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Priority to CN202310766414.4A priority Critical patent/CN116765126A/en
Publication of CN116765126A publication Critical patent/CN116765126A/en
Pending legal-status Critical Current

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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
    • B21B1/22—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 plates, strips, bands or sheets of indefinite length
    • B21B1/24—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten

Abstract

The invention discloses a method for reducing the same plate difference of ultra-wide thin high-alloy steel plates, and belongs to the technical field of ferrous metallurgy. The method adopts a low-temperature long-time heating process when the blank is heated, and the blank is discharged from a heating furnace and then passes through a descaling box for 3-5 times; the rolling process adopts a high-pressure water and high-pressure air combined descaling process, namely, 1-3 passes after initial rolling and 1-3 passes before final rolling adopt high-pressure water for descaling, and the rest rolling passes adopt high-pressure air for descaling; 3-6 times before final rolling, adopting a low-speed small-reduction rolling process. The invention improves the plate shape of the steel plate effectively by innovating the heating and rolling process, the difference between the steel plate and the plate is controlled within 0.4mm, the surface quality of the steel plate is good, and the yield is up to more than 80%.

Description

Method for reducing same plate difference of ultra-wide thin high alloy steel plate
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a method for reducing the same plate difference of an ultra-wide thin-specification high-alloy steel plate.
Background
In recent years, with the development of economy and society, restrictions on resources and energy are becoming more prominent, and environmental protection problems are becoming more serious. In order to balance the relationship between the increasing material demands and environmental protection of people, most projects, equipment and projects need to be updated and upgraded, and the development is towards intensification, enlargement and light weight, the requirements on steel materials used for the projects, the equipment and the projects are also higher and higher, and the steel materials are required to have better performance, larger plate width, thinner thickness and better plate shape.
Therefore, the demand for ultra-wide thin high alloy steel sheets in the market is increasing. When a steel mill produces ultra-wide thin high-alloy steel plates, the steel plates always have plate type defects of thick heads and tails, thin middle and large plate difference, and the reasons for the defects are mainly as follows: when the ultra-wide thin steel plate is rolled, the rolling passes are more, the time is long, the temperature of the head and the tail of the blank is fast reduced, the temperature of the head and the tail is low, the middle temperature is high, and when the same rolling pressure is adopted, the defect that the head and the tail of the steel plate are thick and the middle is thin is necessarily caused. The same plate difference is large, so that the steel plate cannot be used without meeting the technical requirements, and in order to avoid the phenomenon, only the head and the tail can be cut, and the yield is reduced.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for reducing the same plate difference of an ultra-wide thin high-alloy steel plate, which can effectively improve the plate shape of the steel plate and reduce the same plate difference from the aspects of reducing the temperature drop of blanks and optimizing a rolling process.
In order to achieve the aim of the invention, the technical scheme adopted by the invention is as follows:
a method for reducing the same plate difference of ultra-wide thin high alloy steel plates adopts a low-temperature long-time heating process when a blank is heated, and the blank is discharged from a heating furnace and then passes through a descaling box for 3-5 times;
the rolling process adopts a high-pressure water and high-pressure air combined descaling process, namely, 1-3 passes after initial rolling and 1-3 passes before final rolling adopt high-pressure water for descaling, and the rest rolling passes adopt high-pressure air for descaling; 3-6 times before final rolling, adopting a low-speed small-reduction rolling process.
Furthermore, the blank is not used from beginning to end, the thickness deviation of the blank is within 0.8mm, and the deviation of the length and the width is within 7mm.
Further, the blank heating temperature is 1220-1260 ℃ and the furnace time is 4-5 h.
Further, the water pressure of the descaling box is 20-25 MPa.
Further, the high-pressure water is used for descaling, the water pressure is 20-25 MPa, the high-pressure wind is used for descaling, and the wind pressure is 25-30 MPa.
Further, the low-speed small reduction rolling process has the rolling speed of 1-2.5 m/s and the pass reduction of 4-8 mm.
Further, when the steel plate is rolled, the convexity of the roller is controlled within 0.05mm, and the temperature of the roller is controlled between 150 and 200 ℃.
Further, the thickness of the high alloy steel plate is 8-10 mm, and the width is 3500-3800 mm.
Further, the high alloy steel sheet composition contains, in weight percent, C:0.10 to 0.13 percent, si:0.20 to 0.30 percent, mn:0.50 to 0.60 percent, cr:4.5 to 5.5 percent, mo:0.50 to 0.60 percent.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: the high-pressure air and high-pressure water descaling process is adopted in the rolling process of the steel plate, so that the consumption of high-pressure water is reduced, and the temperature drop of blanks in the rolling process is reduced; the low-speed small reduction rolling process is adopted for a plurality of passes before final rolling, so that roll jump can be reduced, and the thickness control of the steel plate is stabilized; the billet is subjected to multiple water tapping at the descaling box, and the scale on the surface of the billet is removed by adopting the descaling box, so that excessive billet temperature drop caused by high-pressure water blowing in the rolling process is reduced; the blank heating adopts a low-temperature long-time heating process, so that oxide scales on the surface of the blank are reduced and the surface quality of the steel plate is improved on the premise of ensuring uniform blank heating.
The steel plate of the invention has the implementation standard of ASME SA387/SA387M-2021.
The invention starts from the blank heating and rolling process, innovates the production process, reduces the same plate difference of the ultra-wide thin high alloy steel plate, and the produced steel plate has good surface quality, and the grinding area caused by surface defects such as iron sheet is not more than 3%; the steel plate yield is high and reaches 80-84%; the same plate difference of the steel plates is controlled within 0.4 mm.
Detailed Description
Example 1
The high alloy steel sheet produced in this example had a thickness of 10mm and a width of 3800mm.
The blanks used in this example were not end to end, the thickness of the blanks was varied by 0.8mm, the length was varied by 7mm, and the width was varied by 7mm.
The blank heating temperature is 1260 ℃ and the furnace time is 4 hours.
The blank is discharged out of the heating furnace and then passes through a descaling box for 3 times, and the water pressure of the descaling box is 20MPa.
The steel plate rolling process adopts a high-pressure water and high-pressure air combined descaling process, namely 3 passes after the steel plate is rolled, 3 passes before final rolling adopt high-pressure water for descaling, and the water pressure is 25MPa; the other rolling passes adopt high-pressure air for descaling, and the air pressure is 30MPa.
The rolling speed is 2.5m/s, and the pass rolling reduction is 8mm.
When the steel plate is rolled, the convexity of the roller is controlled to be 0.05mm, and the temperature of the roller is controlled to be 200 ℃.
Example 2
The high alloy steel plate produced in this example has a thickness of 8mm and a width of 3500mm.
The blanks used in this example were not end to end, the thickness of the blanks was varied by 0.6mm, the length was varied by 6mm, and the width was varied by 3mm.
The blank was heated at 1220 c for 5 hours in the oven.
The blank is discharged from the heating furnace and then passes through a descaling box for 5 times, and the water pressure of the descaling box is 25MPa.
The steel plate rolling process adopts a high-pressure water and high-pressure air combined descaling process, namely 1 pass after the steel plate is rolled, 1 pass before final rolling, and adopts high-pressure water for descaling, wherein the water pressure is 20MPa; the other rolling passes adopt high-pressure air for descaling, and the air pressure is 25MPa.
3 passes before final rolling of the steel plate adopt a low-speed small reduction rolling process, the rolling speed is 1m/s, and the pass reduction is 4mm.
When the steel plate is rolled, the convexity of the roller is controlled to be 0.04mm, and the temperature of the roller is controlled to be 150 ℃.
Example 3
The high alloy steel sheet produced in this example had a thickness of 8.6mm and a width of 3670mm.
The blanks used in this example were not end to end, the thickness of the blanks was varied by 0.7mm, the length was varied by 3mm, and the width was varied by 6mm.
The blank was heated at 1245℃for 4.6 hours in the oven.
The blank is discharged from the heating furnace and then passes through a descaling box for 4 times, and the water pressure of the descaling box is 24MPa.
The steel plate rolling process adopts a high-pressure water and high-pressure air combined descaling process, namely 2 passes after the steel plate is rolled, 3 passes before final rolling, and adopts high-pressure water for descaling, wherein the water pressure is 24MPa; the other rolling passes adopt high-pressure air for descaling, and the air pressure is 27MPa.
4 passes before final rolling of the steel plate adopt a low-speed small reduction rolling process, the rolling speed is 1.9m/s, and the pass reduction is 7mm.
When the steel plate is rolled, the convexity of the roller is controlled to be 0.03mm, and the temperature of the roller is controlled to be 169 ℃.
Example 4
The high alloy steel sheet produced in this example had a thickness of 9.3mm and a width of 3740mm.
The blanks used in this example were not end to end, the thickness of the blanks was varied by 0.7mm, the length was varied by 5mm, and the width was varied by 2mm.
The blank was heated to 1250℃for 4.1 hours in the oven.
The blank is discharged from the heating furnace and then passes through a descaling box for 4 times, and the water pressure of the descaling box is 23MPa.
The steel plate rolling process adopts a high-pressure water and high-pressure air combined descaling process, namely 3 passes after the steel plate is rolled, 1 pass before final rolling, and adopts high-pressure water for descaling, wherein the water pressure is 21MPa; the other rolling passes adopt high-pressure air for descaling, and the air pressure is 29MPa.
And 5 passes before final rolling of the steel plate, adopting a low-speed small reduction rolling process, wherein the rolling speed is 2.1m/s, and the pass reduction is 7mm.
When the steel plate is rolled, the convexity of the roller is controlled to be 0.03mm, and the temperature of the roller is controlled to be 175 ℃.
Example 5
The high alloy steel sheet produced in this example had a thickness of 9.3mm and a width of 3716mm.
The blanks used in this example were not end to end, the thickness of the blanks was varied by 0.4mm, the length was varied by 4mm, and the width was varied by 1mm.
The blank was heated at 1251℃for 4.6 hours in the oven.
The blank is discharged from the heating furnace and then passes through a descaling box for 5 times, and the water pressure of the descaling box is 22MPa.
The steel plate rolling process adopts a high-pressure water and high-pressure air combined descaling process, namely, the steel plate is subjected to descaling by adopting high-pressure water after 1 pass and 3 passes before final rolling, and the water pressure is 24MPa; the other rolling passes adopt high-pressure air for descaling, and the air pressure is 26MPa.
The rolling speed is 2.2m/s, and the pass rolling reduction is 8mm.
When the steel plate is rolled, the convexity of the roller is controlled to be 0.05mm, and the temperature of the roller is controlled to be 184 ℃.
Example 6
The high alloy steel sheet produced in this example has a thickness of 8.6mm and a width of 3510mm.
The blanks used in this example were not end to end, the thickness of the blanks was varied by 0.4mm, the length was varied by 4mm, and the width was varied by 5mm.
The blank was heated at 1247℃for 4.2 hours in the oven.
The blank is discharged from the heating furnace and then passes through a descaling box for 4 times, and the water pressure of the descaling box is 23MPa.
The steel plate rolling process adopts a high-pressure water and high-pressure air combined descaling process, namely, the steel plate is subjected to descaling by adopting high-pressure water for 2 passes after the initial rolling and 3 passes before the final rolling, and the water pressure is 23MPa; the other rolling passes adopt high-pressure air for descaling, and the air pressure is 27MPa.
4 passes before final rolling of the steel plate adopt a low-speed small reduction rolling process, the rolling speed is 2.3m/s, and the pass reduction is 7mm.
When the steel plate is rolled, the convexity of the roller is controlled to be 0.05mm, and the temperature of the roller is controlled to be 173 ℃.
Example 7
The high alloy steel sheet produced in this example had a thickness of 8.9mm and a width of 3610mm.
The blanks used in this example were not end to end, the thickness of the blanks was varied by 0.7mm, the length was varied by 5mm, and the width was varied by 4mm.
The blank was heated at 1239℃for 4.5 hours in the oven.
The blank is discharged from the heating furnace and then passes through the descaling box for 4 times, and the water pressure of the descaling box is 21MPa.
The steel plate rolling process adopts a high-pressure water and high-pressure air combined descaling process, namely, the steel plate is subjected to descaling by adopting high-pressure water in 2 passes after the initial rolling and 1 pass before the final rolling, and the water pressure is 24MPa; the other rolling passes adopt high-pressure air for descaling, and the air pressure is 27MPa.
And 5 passes before final rolling of the steel plate are performed, a low-speed small reduction rolling process is adopted, the rolling speed is 2.4m/s, and the pass reduction is 6mm.
When the steel plate is rolled, the convexity of the roller is controlled to be 0.03mm, and the temperature of the roller is controlled to be 189 ℃.
Example 8
The high alloy steel sheet produced in this example had a thickness of 9.8mm and a width of 3710mm.
The blanks used in this example were not end to end, the thickness of the blanks was varied by 0.5mm, the length was varied by 3mm, and the width was varied by 4mm.
The blank was heated at 1247℃for 4.6 hours in the oven.
The blank is discharged from the heating furnace and then passes through a descaling box for 4 times, and the water pressure of the descaling box is 23MPa.
The steel plate rolling process adopts a high-pressure water and high-pressure air combined descaling process, namely 3 passes after the steel plate is rolled, 2 passes before final rolling adopt high-pressure water for descaling, and the water pressure is 24MPa; the other rolling passes adopt high-pressure air for descaling, and the air pressure is 27MPa.
3 passes before final rolling of the steel plate adopt a low-speed small reduction rolling process, the rolling speed is 2.1m/s, and the pass reduction is 5mm.
When the steel plate is rolled, the convexity of the roller is controlled to be 0.03mm, and the temperature of the roller is controlled to be 159 ℃.
The main components and contents (wt%) of the high alloy steel sheets produced in each example are shown in table 1, and the surface quality, yield and difference between the same sheets are shown in table 2.
TABLE 1 Main Components and contents (wt%) of high alloy Steel sheets produced in examples
TABLE 2 surface quality, yield and plate Co-plate difference of high alloy Steel plates produced in examples
。

Claims (9)

1. A method for reducing the same plate difference of ultra-wide thin high alloy steel plates is characterized in that a low-temperature long-time heating process is adopted when a blank is heated, and the blank is discharged from a heating furnace and then passes through a descaling box for 3-5 times;
the rolling process adopts a high-pressure water and high-pressure air combined descaling process, namely, 1-3 passes after initial rolling and 1-3 passes before final rolling adopt high-pressure water for descaling, and the rest rolling passes adopt high-pressure air for descaling; 3-6 times before final rolling, adopting a low-speed small-reduction rolling process.
2. The method for reducing the same plate difference of the ultra-wide thin-specification high alloy steel plate according to claim 1, which is characterized in that: the blank does not use head and tail blanks, the thickness deviation of the blank is within 0.8mm, and the deviation of the length and the width is within 7mm.
3. The method for reducing the same plate difference of the ultra-wide thin-specification high alloy steel plate according to claim 2, which is characterized in that: the heating temperature of the blank is 1220-1260 ℃ and the furnace time is 4-5 h.
4. The method for reducing the same plate difference of the ultra-wide thin-specification high alloy steel plate according to claim 3, which is characterized in that: the water pressure of the descaling box is 20-25 MPa.
5. The method for reducing the same plate difference of the ultra-wide thin-specification high alloy steel plate according to claim 4, which is characterized in that: the high-pressure water is used for descaling, the water pressure is 20-25 MPa, and the high-pressure wind is used for descaling, and the wind pressure is 25-30 MPa.
6. The method for reducing the same plate difference of the ultra-wide thin-specification high alloy steel plate according to claim 5, which is characterized in that: the low-speed small-reduction rolling process has the rolling speed of 1-2.5 m/s and the pass reduction of 4-8 mm.
7. The method for reducing the same plate difference of the ultra-wide thin-specification high alloy steel plate according to claim 6, which is characterized in that: when the steel plate is rolled, the convexity of the roller is controlled within 0.05mm, and the temperature of the roller is controlled between 150 and 200 ℃.
8. The method for reducing the same plate difference of the ultra-wide thin gauge high alloy steel plate as set forth in any one of claims 1 to 7, wherein: the thickness of the high alloy steel plate is 8-10 mm, and the width is 3500-3800 mm.
9. The method for reducing the same plate difference of the ultra-wide thin-specification high alloy steel plate according to claim 8, which is characterized in that: the high alloy steel sheet comprises the following components in percentage by weight: 0.10 to 0.13 percent, si:0.20 to 0.30 percent, mn:0.50 to 0.60 percent, cr:4.5 to 5.5 percent, mo:0.50 to 0.60 percent.
CN202310766414.4A 2023-06-27 2023-06-27 Method for reducing same plate difference of ultra-wide thin high alloy steel plate Pending CN116765126A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310766414.4A CN116765126A (en) 2023-06-27 2023-06-27 Method for reducing same plate difference of ultra-wide thin high alloy steel plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310766414.4A CN116765126A (en) 2023-06-27 2023-06-27 Method for reducing same plate difference of ultra-wide thin high alloy steel plate

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