CN114085970B - Manufacturing method for overcoming hot-rolled soft and hard edges of ferrite stainless steel - Google Patents
Manufacturing method for overcoming hot-rolled soft and hard edges of ferrite stainless steel Download PDFInfo
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- CN114085970B CN114085970B CN202111355959.3A CN202111355959A CN114085970B CN 114085970 B CN114085970 B CN 114085970B CN 202111355959 A CN202111355959 A CN 202111355959A CN 114085970 B CN114085970 B CN 114085970B
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- heat preservation
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
A manufacturing method for overcoming the soft and hard edges of ferrite stainless steel hot rolling adopts a heat preservation pit slow cooling mode for a hot rolled steel coil, and simultaneously utilizes the heat provided by other hot coils to slowly reduce the temperature in the area of the hot rolled steel coil, so that the steel coil can be heated uniformly and cooled slowly. The invention adopts special slow cooling measures, utilizes the heat preservation function of the heat preservation pit and other hot coils to provide heat, slowly reduces the temperature in a certain area, achieves the purposes of uniformly heating and slowly cooling the steel coil, is beneficial to converting the alpha phase of the gamma phase in the phase change process, effectively improves the mechanical property of the steel coil, and solves the problem of poor molding property of 430/white.
Description
Technical Field
The invention belongs to the technical field of metallurgical steel rolling, and particularly relates to a manufacturing method for overcoming hot-rolled soft and hard edges of ferrite stainless steel.
Background
The existing 430/white product is placed in a storage area after hot rolling, the temperature is continuously reduced, the temperature difference between the inside and the outside is larger and larger, the cooling speed of each part is uneven, the mechanical properties are uneven, and the problem that concave-convex stripes exist in the downstream formed product and the mechanical properties are poor is caused.
Disclosure of Invention
The invention aims to provide a manufacturing method for overcoming hot-rolled soft and hard edges of ferrite stainless steel, which aims to solve a series of cost problems caused by poor performance through controlling the forming performance, has simple operation, is suitable for large-scale production in factories, can maximally eliminate the problem of uneven mechanical performance of steel coils, has excellent surface and inner quality of the slowly cooled steel coils, and reduces the generation of defective products.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a manufacturing method for overcoming the soft and hard edges of ferrite stainless steel hot rolling adopts a heat preservation pit slow cooling mode for a hot rolled steel coil, and simultaneously utilizes the heat provided by other hot coils to slowly reduce the temperature in the area of the hot rolled steel coil, so that the steel coil can be heated uniformly and cooled slowly.
The method specifically comprises the following steps:
1) And (3) heating the heat preservation pit: preparing a heat preservation pit in advance according to production time, lifting black steel coils with the temperature of 840-900 ℃ produced by hot rolling into the heat preservation pit, and lifting the temperature of the heat preservation pit by using the heat of the black steel coils, wherein the black steel coils are arranged in rows, and intervals are arranged between the rows, so that the temperature in the heat preservation pit is raised to 400-500 ℃;
2) And (3) charging at a temperature: the hot rolled steel coils needing to overcome the soft and hard edges are immediately lifted into the heat preservation pits after being produced, and are arranged between the black-skin preheating steel coils in rows, and meanwhile, the heat preservation pits are closed to form a closed space;
3) The heat preservation process comprises the following steps: the steel coil needs to be stacked in the heat preservation pit for more than 24 hours, and the steel coil is slowly cooled;
4) And (3) a cooling process: opening the upper cover of the heat preservation pit, contacting with the outside, reducing the temperature to 40 ℃ at a speed of 20-60 ℃/h, and discharging to carry out the next process treatment.
The thickness of the hot rolled steel coil is 2.5-10 mm, and the width is 800-1500mm.
The coil temperature of the hot rolled steel coil is 800-1000 ℃.
Compared with the prior art, the invention has the beneficial effects that:
1) The invention adopts special slow cooling measures, utilizes the heat preservation function of the heat preservation pit and other hot coils to provide heat, slowly reduces the temperature in a certain area, achieves the purposes of uniformly heating and slowly cooling the steel coil, is beneficial to converting the alpha phase of the gamma phase in the phase change process, effectively improves the mechanical property of the steel coil, and solves the problem of poor molding property of 430/white.
2) The coil temperature of the slow-cooling steel coil is set at 880 ℃, so that the pickling of the downstream of the steel coil is facilitated, meanwhile, the enough high output temperature is considered, and the mechanical properties are improved by matching with slow cooling.
3) The invention can effectively solve the problem of poor molding property of 430\white, the black skin slow cooling roll is 4-8 lower than the common roll HRB, and the slow cooling roll elongation is improved by about 3-17%.
Drawings
FIG. 1 is a graph comparing tensile strength of an example of the present invention with a conventional steel grade without particularly slow cooling.
FIG. 2 is a graph comparing yield strength of an example of the present invention with a conventional steel grade without particularly slow cooling.
FIG. 3 is a graph comparing elongation of an example of the present invention with a conventional steel grade without particularly slow cooling.
FIG. 4 is a graph comparing hardness and strength of an example of the present invention with a conventional steel grade without particularly slow cooling.
Detailed Description
Embodiments of the invention are further described below in conjunction with specific examples:
the embodiment of the invention needs to sequentially produce the black steel coil without soft and hard edges and the hot rolled steel coil with soft and hard edges, and the black steel coil is advanced by 3-4 hours.
The composition of the steel grade of the example is shown in table 1; example hot rolling process parameters are shown in table 2; the placement positions of the heat preservation pits of the black steel coil and the hot-rolled slow-cooling steel coil are shown in Table 3.
TABLE 1 example Steel grade composition (wt%)
| C | Si | Mn | P | S | Ni | Cr | Mo | Cu | N |
| 0.04 | 0.35 | 0.334 | 0.026 | 0.003 | 0.141 | 16.15 | 0.008 | 0.045 | 0.045 |
Table 2 example hot rolling process parameters
TABLE 3 position of pit placement
1) And (3) heating the heat preservation pit: preparing a heat preservation pit in advance according to the production time, immediately lifting the black steel coils into the heat preservation pit after the production of the common black steel coils, arranging the black steel coils in rows, and setting intervals between the rows to enable the temperature in the heat preservation pit to be increased to 400-500 ℃;
according to the speed (4-6 minutes/coil) of the black steel coil produced by hot rolling, the temperature in the heat preservation pit is higher and higher along with more and more preheated black steel coils in the heat preservation pit, and when the preheated coil is fully filled, the time is required to be 3-4 hours, and the temperature in the pit can reach 400-500 ℃.
2) And (3) charging at a temperature: the hot rolled steel coils which need to overcome the soft and hard edges are immediately lifted into the heat preservation pits after being produced, and are arranged between the black skin preheating steel coils in rows, and meanwhile, the heat preservation pits are closed to form a closed space;
3) The heat preservation process comprises the following steps: the steel coil needs to be stacked in the heat preservation pit for more than 24 hours, and the steel coil is slowly cooled;
4) And (3) a cooling process: opening the upper cover of the heat preservation pit, reducing the temperature to 40 ℃ at a speed of 20-60 ℃/h, and discharging the pit for the next process treatment.
In the hot rolling process, the temperature of the steel coil is effectively controlled to be uniformly and slowly reduced through the heat preservation pit, so that the effect of the black skin annealing process is achieved, and compared with the effect of the prior art, the invention is shown in figures 1-4.
Claims (2)
1. A manufacturing method for overcoming hot-rolled soft and hard edges of ferrite stainless steel is characterized in that a heat preservation pit slow cooling mode is adopted for a hot-rolled steel coil, and meanwhile, the heat provided by other hot coils is utilized to enable the temperature in the area of the hot-rolled steel coil to be slowly lowered, so that the steel coil can be uniformly heated and slowly cooled;
1) And (3) heating the heat preservation pit: lifting black steel coils which are produced by hot rolling and have the temperature of 840-900 ℃ into a heat preservation pit, and lifting the temperature of the heat preservation pit by using the heat of the black steel coils, wherein the black steel coils are arranged in rows, and intervals are arranged between the rows, so that the temperature in the heat preservation pit is raised to 400-500 ℃;
2) And (3) charging at a temperature: the hot rolled steel coils needing to overcome the soft and hard edges are immediately lifted into the heat preservation pits after being produced, and are arranged between the black-skin preheating steel coils in rows, and meanwhile, the heat preservation pits are closed to form a closed space;
3) The heat preservation process comprises the following steps: stacking the steel coils in the heat preservation pit for more than 24 hours, and slowly cooling the steel coils;
4) And (3) a cooling process: opening an upper cover of the heat preservation pit, wherein the cooling rate is 20-60 ℃/h, so that the temperature is reduced to 40 ℃, and then discharging the pit for the next procedure treatment;
the coil temperature of the hot rolled steel coil is 800-1000 ℃.
2. The method for manufacturing hot rolled soft and hard edges of ferritic stainless steel according to claim 1, wherein the thickness of the hot rolled steel coil is 2.5-10 mm and the width is 800-1500mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111355959.3A CN114085970B (en) | 2021-11-16 | 2021-11-16 | Manufacturing method for overcoming hot-rolled soft and hard edges of ferrite stainless steel |
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| CN202111355959.3A CN114085970B (en) | 2021-11-16 | 2021-11-16 | Manufacturing method for overcoming hot-rolled soft and hard edges of ferrite stainless steel |
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| CN114085970B true CN114085970B (en) | 2023-06-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3400351B2 (en) * | 1997-05-29 | 2003-04-28 | 川崎製鉄株式会社 | Manufacturing method of high strength and high workability hot rolled steel sheet with excellent impact resistance |
| CN103966409A (en) * | 2013-01-31 | 2014-08-06 | 宝钢不锈钢有限公司 | Manufacturing method for medium chrome ferrite stainless steel |
| CN110616306A (en) * | 2018-06-19 | 2019-12-27 | 宝钢湛江钢铁有限公司 | Hot rolling on-line mobile heat preservation heat treatment process |
| CN110918652B (en) * | 2019-10-30 | 2021-05-28 | 鞍钢股份有限公司 | Production method for improving internal stress of high-strength hot-rolled strip steel at low cost |
| CN113512686B (en) * | 2021-07-16 | 2022-04-12 | 天津市新天钢钢铁集团有限公司 | Production method of hot-rolled, whole-coil annealed and pickled steel strip with high alloy content |
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