CN114054516A - Production method of hot-rolled pickled plate for compressor - Google Patents
Production method of hot-rolled pickled plate for compressor Download PDFInfo
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- CN114054516A CN114054516A CN202111332304.4A CN202111332304A CN114054516A CN 114054516 A CN114054516 A CN 114054516A CN 202111332304 A CN202111332304 A CN 202111332304A CN 114054516 A CN114054516 A CN 114054516A
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- rolled pickled
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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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
- B21B45/02—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 lubricating, cooling, or cleaning
- B21B45/0203—Cooling
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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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- 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
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- 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
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- 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
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- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2263/00—Shape of product
- B21B2263/02—Profile, e.g. of plate, hot strip, sections
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to a production method of a hot-rolled pickled plate for a compressor, belonging to the technical field of production of hot continuous rolled plate strips. The invention comprises the following steps when producing the strip steel: a. opening cooling water at the outlet positions of at least two finishing mills in the rolling process; b. the finish rolling temperature is controlled to be 880 +/-20 ℃ in the rolling process; c. the laminar cooling section after rolling adopts a front section cooling mode, the water boiling rate of the upper collecting pipe is 25%, and the water boiling rate of the lower collecting pipe is 50%. The invention optimizes the controlled rolling and controlled cooling process of the hot-rolled pickled plate for the compressor, refines the structure crystal grains of the product by opening cooling water between frames of the finishing mill, controlling the finishing rolling temperature of the finishing rolling and adopting a front section cooling mode, improves the structure uniformity of the product, and avoids the structure mixed crystal phenomenon at the edge of strip steel, thereby obviously improving the forming performance of the hot-rolled pickled plate for the compressor.
Description
Technical Field
The invention relates to a production method of a hot-rolled pickled plate for a compressor, belonging to the technical field of production of hot continuous rolled plate strips.
Background
The hot-rolled pickled plate is an intermediate product between a cold-rolled plate and a hot-rolled plate, and has high surface quality and dimensional precision as a high-quality hot-rolled thin plate is used as a raw material and a surface oxide layer is removed by pickling, and the mechanical property characteristics of the hot-rolled plate are kept. Nowadays, hot-rolled pickled plates are widely applied to the industries of household appliances, automobiles and the like, and it has become a trend that customers effectively reduce the raw material purchasing cost by a mode of replacing cold with hot. The hot-rolled pickled plate is mainly applied to shells of air conditioners and refrigerator compressors in the household appliance industry, and the hot-rolled pickled plate requires multiple working procedures such as stamping, flanging and the like in the forming process, so that high requirements on the stamping forming performance are provided. However, in the actual manufacturing process of the compressor housing, when a hot-rolled pickled plate is pressed, forming defects such as cracking and uneven deformation (lug formation) are generated, which seriously affects the processing and use of the compressor housing.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provides a production method of a hot-rolled pickled plate for a compressor, which aims to improve the forming performance of the hot-rolled pickled plate for the compressor.
In order to solve the technical problems, the invention adopts the technical scheme that: the production method of the hot-rolled pickled plate for the compressor comprises the following steps:
a. opening cooling water at the outlet positions of at least two finishing mills in the rolling process;
b. the finish rolling temperature is controlled to be 880 +/-20 ℃ in the rolling process;
c. the rolled laminar cooling section adopts a front section cooling mode, and the water boiling rate of an upper header is 20-30%; the water boiling rate of the lower collecting pipe is 40-60%.
The invention is especially suitable for the hot-rolled pickled plate for the compressor with the following technological parameters: the hot-rolled pickled plate for the compressor comprises the following components in percentage by weight: c: 0.005-0.020%, Si is less than or equal to 0.03%, Mn: 0.15-0.25%, P is less than or equal to 0.015%, S is less than or equal to 0.010%, Als: 0.010-0.045%, and the balance of Fe and inevitable impurities. The thickness of the hot-rolled pickled plate for the compressor is 2.0-4.0 mm.
The invention has the beneficial effects that: the invention optimizes the controlled rolling and controlled cooling process of the hot-rolled pickled plate for the compressor, refines the structure crystal grains of the product by opening cooling water between frames of the finishing mill, controlling the finishing rolling temperature of the finishing rolling and adopting a front section cooling mode, improves the structure uniformity of the product, and avoids the structure mixed crystal phenomenon at the edge of strip steel, thereby obviously improving the forming performance of the hot-rolled pickled plate for the compressor. The method is simple to operate and easy to implement, can improve the forming performance of the hot-rolled pickled plate for the compressor, avoids the generation of forming defects such as cracking, uneven deformation (lug making) and the like during stamping forming, and is suitable for popularization and application.
Drawings
FIG. 1 is a metallographic structure diagram of a portion 40mm away from a wide side portion of a plate according to an embodiment of the present invention;
FIG. 2 is a structural view of a metallographic structure of a comparative example at a distance of 40mm from a wide side of a sheet;
FIG. 3 is a simulation result of the final rolling temperature distribution curve of the surface of the strip steel in the width direction.
Detailed Description
The invention comprises the following steps during production:
a. opening cooling water at the outlet positions of at least two finishing mills (generally, the cooling water can be simply called as 'cooling water between finishing mill stands') in the rolling process;
b. the finish rolling temperature is controlled to be 880 +/-20 ℃ in the rolling process;
c. the rolled laminar cooling section adopts a front section cooling mode, the water boiling rate of an upper collecting pipe is 20-30%, and the implementation is preferably carried out according to the water boiling rate of the upper collecting pipe being 25% in the actual production process; the water boiling rate of the lower collecting pipe is 40-60%, and the actual production process is preferably implemented according to the water boiling rate of the lower collecting pipe being 50%.
The hot-rolled pickled plate for the compressor comprises the following components in percentage by weight: c: 0.005-0.020%, Si is less than or equal to 0.03%, Mn: 0.15-0.25%, P is less than or equal to 0.015%, S is less than or equal to 0.010%, Als: 0.010-0.045%, and the balance of Fe and inevitable impurities. The thickness of the hot-rolled pickled plate for the compressor is 2.0-4.0 mm.
In the invention, the cooling water at the outlet positions of at least two finishing mills is opened in the finish rolling process, the cooling water between the finishing mill frames is opened to improve the cooling speed of the strip steel in the finish rolling process, and the rolling speed is improved on the basis of ensuring the finish rolling temperature of the finish rolling, thereby improving the cooling speed of the laminar cooling section, simultaneously reducing the difference between the finish cooling temperature and the final coiling temperature of the laminar cooling section, refining the product structure crystal grains and improving the product forming performance. Generally, according to the actual process equipment capacity, cooling water between any two finishing mill frames is selected to be opened.
The invention controls the finish rolling temperature to 880 +/-20 ℃, and adopts higher finish rolling temperature to avoid the phenomenon of mixed crystal of tissues caused by that a plurality of frames are in an austenite-ferrite two-phase region for rolling after the strip steel is finish rolled. The heat dissipation of the thin strip steel is fast in the hot rolling process, particularly in the edge area of the strip steel, if the temperature is improperly controlled, the actual rolling temperature in the finish rolling process is easily lower than the phase transformation point temperature Ar3, so that the strip steel is rolled in an austenite-ferrite two-phase area. When rolling is carried out in a two-phase region temperature range, part of austenite is converted into proeutectoid ferrite, residual austenite is rolled at a lower non-recrystallization temperature and then is transformed into equiaxed and fine ferrite grains, and the proeutectoid ferrite is deformed, stores a large amount of deformation energy and is released by swallowing small grains to grow, so that mixed crystal tissues are generated, and the product forming performance is obviously deteriorated.
The invention adopts a front-section cooling mode in the laminar cooling section, so that the crystal grains of the product structure are refined, the uniformity of the strip steel structure is improved, and the forming performance of the product is improved. By adopting a front-section cooling mode, the cooling speed after finish rolling can be increased, and the supercooling degree is increased, so that ferrite grains are refined, and the uniformity of the structure is improved.
The following examples and comparative examples further illustrate specific embodiments of the present invention.
Examples and comparative examples
The components of the examples and the comparative examples are the same, specifically: c: 0.020%, Si: 0.02%, Mn: 0.18%, P: 0.007%, S: 0.011%, Als: 0.044%, and the balance of Fe and inevitable impurities.
The key process performance of the examples and comparative examples is shown in table 1. The metallographic structure of each of the examples and comparative examples was examined at a distance of 40mm from the wide side of the sheet, and the results are shown in table 2, fig. 1, and fig. 2. It can be seen that the metallographic structures of the examples and the comparative examples are ferrite + trace cementite, ferrite grains at the wide edge of the example plate are fine and uniform, but ferrite grains at the wide edge of the comparative example plate are different in size, and part of ferrite grains grow abnormally and appear obvious mixed crystal phenomenon.
TABLE 1 Key Process execution of examples and comparative examples
TABLE 2 metallographic structure test results
| Categories | Sampling site | Grain size grade | Tissue of |
| Examples | The wide edge of the plate is 40mm | 8.0 | Ferrite + trace cementite |
| Comparative example | The wide edge of the plate is 40mm | Mixed crystal | Ferrite + trace cementite |
The method comprises the following steps of performing simulation on final rolling temperature distribution conditions of an embodiment and a comparative example by adopting ANSYS software, measuring 12% of strip steel final rolling deformation, comprehensively considering contact heat exchange between strip steel and a roller, strip steel deformation heat generation and heat radiation heat exchange, and finally obtaining final rolling temperatures of 880 ℃ and 850 ℃, namely the strip steel temperature distribution conditions of the embodiment and the comparative example, as shown in FIG. 3, because the strip steel head and tail have the lowest temperature and the highest temperature in the core part, the head and tail are generally cut off for a certain length in actual production and application, and therefore the strip steel head and tail are not considered; the surface temperature of the strip steel is lower than the core temperature, so whether the surface temperature of the strip steel is lower than the phase transition point temperature Ar3 or not is mainly analyzed. As can be seen from fig. 3, the surface temperatures of most regions in the widthwise middle of the sheet were controlled to be substantially 880 c and 850 c, respectively, but the temperature within 100mm of the widthwise edge of the sheet was significantly reduced, wherein the surface temperatures were reduced to 846 c and 821 c, respectively, at 40mm from the widthwise edge of the sheet. In the comparative example, because cooling water between the stands is not opened in the actual rolling process, the rolling speed is slow, and the actual temperature difference in the plate width direction is larger than the simulation result of the finishing temperature of 850 ℃.
According to the simulation result of the finish rolling temperature distribution (figure 3), the surface temperature of the middle part of the width of the plate of the embodiment is controlled to be 880 ℃, and the surface temperature of the position 40mm away from the edge part of the width of the plate is kept to be about 846 ℃; while the surface temperature of the middle part of the comparative example sheet width was controlled at 850 deg.c and the surface temperature of the sheet width 40mm from the side parts was reduced to about 820 deg.c (the actual temperature would be lower because the inter-stand cooling water was not opened, the rolling speed was slower). Combining the metallographic structure test results (fig. 1 and fig. 2), it can be seen that the surface temperature of the wide side part of the plate at a position 40mm away from the side part is still maintained at about 846 ℃ in the finish rolling of the embodiment, so that the wide side part of the plate can be basically prevented from being rolled in a two-phase region; and because the thickness is thin (2.0mm), and the rolling speed and the finishing temperature of the comparative example are lower, the surface temperature of the wide side part of the plate at 40mm away from the side part is reduced to about 820 ℃ in the finishing rolling, and the temperature is lower than the phase transformation point temperature Ar3, so that the wide side part of the plate is rolled in an austenite-ferrite two-phase region, and finally, a mixed crystal structure is generated.
Tensile samples were taken from the sides of the examples and comparative examples for comparison of the properties, and the results of the tensile test are shown in tables 3 and 4. As can be seen from Table 3, (1) the example had a clear yield point, the yield strength being ReL, while the comparative example had no clear yield point, the yield strength being Rp0.2, i.e., the stress at which 0.2% deformation occurred was taken as the yield strength. (2) The yield strength and tensile strength of the examples and comparative examples are almost stable in all directions, and the yield strength is not comparable due to the difference in the evaluation method, but the strength difference between the two is not large in view of the tensile strength. (3) The A50mm and Agt of the example remained substantially stable, while the elongation after break A50mm and the uniform elongation Agt of the comparative example were each somewhat different and their values were significantly reduced, indicating that the plasticity of the material was poor.
As can be seen from Table 4, the process performance of the examples is significantly improved, mainly in the following aspects: (1) the higher work hardening index n of the examples indicates a higher work hardening capacity. When the metal part is stamped, the plastic deformation part of the metal part is accompanied by work hardening phenomenon, so that the deformation is transferred to the peripheral unreinforced part, and the stamped part with uniform and consistent section deformation can be obtained through repeated and alternate actions, therefore, the high work hardening capacity is considered to improve the deformation homogenization capacity of the material. (2) The plastic strain of the embodiment is larger than the r value, and the r value difference of each direction is smaller. The plastic strain ratio r is the ratio of the width strain to the thickness strain of a sheet material test piece in a tensile test, and researches show that the smaller the difference of r values in all directions, the larger the minimum r value is, and the more difficult the lug making defect is. (3) Examples of the invention
The value is higher.
The value is a weighted average value of the plastic strain ratio r, and the higher the value is, the less the material is deformed and thinned in the thickness direction when being subjected to stamping deformation, so that the cracking risk is reduced; (4) the small value of | Δ r | of the examples indicates a small degree of anisotropy of the material. The plastic strain ratio anisotropy degree delta r represents the anisotropy degree of the material, and in the deep drawing deformation process, | delta r | is larger, the material thickness change in the direction with a high r value is small, the deep drawing height is large, and the deep drawing height in the direction with a low r value is small, so that the ear making defect is generated.
TABLE 3 results of conventional mechanical Properties
TABLE 4 results of measurements of processing Properties
The embodiment and the comparative example show that the invention provides a production method for improving the forming performance of a hot-rolled pickled plate for a compressor, the structure crystal grains of a product are refined, the uniformity of the product structure is improved and the structure mixed crystal phenomenon at the edge of strip steel is avoided by opening cooling water between frames of a finishing mill, controlling the finishing rolling temperature of finishing rolling and adopting a front-stage cooling mode, so that the forming performance of the hot-rolled pickled plate for the compressor is obviously improved, and the method is mainly shown in the following aspects: 1) the elongation after fracture and the uniform elongation have small difference in each direction and higher numerical value, and the plasticity of the material is good; 2) the work hardening index n is higher, and the deformation homogenization capability of the material is good; 3) the difference of the plastic strain ratio r value in each direction is small, the minimum r value is increased, and the material is not easy to generate ear making defects; 4) plastic strain ratioWeighted average
The value is high, and the material is not easy to deform and thin in the thickness direction when being subjected to stamping deformation, so that the cracking risk is reduced; 5) the value of the plastic strain ratio anisotropy | delta r | is smaller, and the anisotropy degree of the material is smaller. The method is simple to operate and easy to implement, can obviously improve the forming performance of the hot-rolled pickled plate for the compressor, and has good application prospect.
Claims (3)
1. The production method of the hot-rolled pickled plate for the compressor is characterized by comprising the following steps of:
a. opening cooling water at the outlet positions of at least two finishing mills in the rolling process;
b. the finish rolling temperature is controlled to be 880 +/-20 ℃ in the rolling process;
c. the rolled laminar cooling section adopts a front section cooling mode, the water boiling rate of an upper collecting pipe is 20-30%, and the water boiling rate of a lower collecting pipe is 40-60%.
2. The process for producing a hot-rolled pickled plate for a compressor as claimed in claim 1, wherein: the hot-rolled pickled plate for the compressor comprises the following components in percentage by weight: c: 0.005-0.020%, Si is less than or equal to 0.03%, Mn: 0.15-0.25%, P is less than or equal to 0.015%, S is less than or equal to 0.010%, Als: 0.010-0.045%, and the balance of Fe and inevitable impurities.
3. The method for producing a hot-rolled pickled plate for a compressor as claimed in claim 1 or 2, wherein: the thickness of the hot-rolled pickled plate for the compressor is 2.0-4.0 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111332304.4A CN114054516A (en) | 2021-11-11 | 2021-11-11 | Production method of hot-rolled pickled plate for compressor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111332304.4A CN114054516A (en) | 2021-11-11 | 2021-11-11 | Production method of hot-rolled pickled plate for compressor |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104480391A (en) * | 2014-11-24 | 2015-04-01 | 江苏省沙钢钢铁研究院有限公司 | Hot-rolled pickled plate and production method thereof |
| CN110484827A (en) * | 2018-03-27 | 2019-11-22 | 上海梅山钢铁股份有限公司 | A kind of tensile strength 600MPa grades of low yield strength ratio hot rolling acid-cleaning steel plates |
| CN113231464A (en) * | 2021-04-16 | 2021-08-10 | 首钢集团有限公司 | Method for reducing incidence rate of mixed crystal defects on surface of pickled plate |
| CN113263152A (en) * | 2021-04-14 | 2021-08-17 | 首钢集团有限公司 | Method for controlling surface banding chromatic aberration incidence rate of low-carbon aluminum killed steel after acid pickling |
| CN113584397A (en) * | 2021-08-10 | 2021-11-02 | 邯郸钢铁集团有限责任公司 | Steel plate for air-conditioning compressor and production method thereof |
-
2021
- 2021-11-11 CN CN202111332304.4A patent/CN114054516A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104480391A (en) * | 2014-11-24 | 2015-04-01 | 江苏省沙钢钢铁研究院有限公司 | Hot-rolled pickled plate and production method thereof |
| CN110484827A (en) * | 2018-03-27 | 2019-11-22 | 上海梅山钢铁股份有限公司 | A kind of tensile strength 600MPa grades of low yield strength ratio hot rolling acid-cleaning steel plates |
| CN113263152A (en) * | 2021-04-14 | 2021-08-17 | 首钢集团有限公司 | Method for controlling surface banding chromatic aberration incidence rate of low-carbon aluminum killed steel after acid pickling |
| CN113231464A (en) * | 2021-04-16 | 2021-08-10 | 首钢集团有限公司 | Method for reducing incidence rate of mixed crystal defects on surface of pickled plate |
| CN113584397A (en) * | 2021-08-10 | 2021-11-02 | 邯郸钢铁集团有限责任公司 | Steel plate for air-conditioning compressor and production method thereof |
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