CN114182182A - Hot-rolled pickled steel plate for refrigerator compressor shell and manufacturing method thereof - Google Patents
Hot-rolled pickled steel plate for refrigerator compressor shell and manufacturing method thereof Download PDFInfo
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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
- 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
- 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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- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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Abstract
The invention discloses a hot-rolled pickled steel plate for a refrigerator compressor shell and a manufacturing method thereof, and mainly solves the technical problems that the hot-rolled pickled steel plate for the refrigerator compressor shell is low in stamping performance and has a lug making defect in the process of stamping the refrigerator compressor shell. The technical scheme is that the hot-rolled pickled steel plate for the refrigerator compressor shell comprises the following chemical components in percentage by weight: c: 0.040-0.065%, Si: 0-0.034%, Mn: 0.17-0.27%, P: 0-0.018%, S: 0-0.013%, Alt: 0.02-0.06%, Nb: 0-0.005%, Ti: 0 to 0.005%, and the balance of Fe and inevitable impurity elements. The metallographic structure of the hot-rolled pickled steel plate is ferrite and a small amount of pearlite, and the steel plate is mainly used for manufacturing parts such as a refrigerator compressor shell and the like.
Description
Technical Field
The invention relates to a hot-rolled pickled steel plate, in particular to a hot-rolled pickled steel plate for a refrigerator compressor shell and a manufacturing method thereof, and belongs to the technical field of steel material manufacturing.
Background
The hot rolled plate is subjected to acid pickling treatment to obtain a hot rolled acid pickled steel plate, and after the hot rolled plate is subjected to acid pickling treatment, the surface quality of the hot rolled plate is greatly improved, and the mechanical property, the plate type and the like of the hot rolled plate are superior to those of the hot rolled plate, and the hot rolled plate can partially replace the cold rolled plate, so that the production and manufacturing cost of enterprises is reduced, and the hot rolled plate is widely applied to the fields of compressors, automobile structures and the like which have high requirements on material properties.
The compressor is an important part of a household appliance refrigerator and an air conditioner, the shape of the shell of the compressor is complex, the forming precision is high, the processing technology has the characteristic of continuous high-speed automation, the requirement of the shell of the compressor on materials is very high, and the defects of punching cracking, punching lug making and the like are often generated in the process of preparing the shell of the compressor by using a hot-rolled pickled steel plate.
The existing refrigerator compressor shell comprises a two-section integral structure and a three-section structure, an upper cover and an outer shell of the two-section integral structure are formed by stamping and drawing and then welded into a whole, two welding seams are omitted compared with the three-section compressor shell, and the safety of the whole compressor is improved; the upper cover of the two-section integral structure is simple to form, and the forming and punching are completed through 4-5 times of continuous stamping; the two-section integral-structure shell adopts a secondary stamping process due to the deep stamping and drawing degree, wherein the secondary stamping and drawing is carried out on the shell which is stamped for the first time in a reverse stamping and drawing mode.
The special secondary deep-drawing forming process has very high requirement on the stamping performance of a processed shell raw plate, if the stamping performance of a product is insufficient, obvious lug making defects can be formed during primary stamping, and then the lugs are made to be more serious or even cracked during secondary stamping, so that stamping equipment can be damaged, and the production efficiency is greatly influenced. Ear making defects can also result in reduced yield and increased production costs.
Chinese patent application publication No. CN108728751A discloses an IF isotropic steel for improving press forming and a manufacturing method thereof, the IF isotropic steel is composed of the following components by weight percent: c: 0.0012-0.0026%, Si is less than or equal to 0.026%, Mn: 0.28-0.52%, P is less than or equal to 0.015%, S is less than or equal to 0.010%, Al: 0.042-0.082%, Ti: 0.046-0.066%, less than or equal to 0.0030% of N, and the balance of Fe and inevitable impurities; by controlling the C content at a lower level, the Mn and Ti are improved, the Delta r value is reduced, excellent IF isotropic steel is obtained, and the production cost is high.
The prior art lacks an effective solution to the problem of the lug making defect in deep stamping of the refrigerator compressor shell, and cannot meet the requirement of the refrigerator compressor shell on the stamping lug making rate.
Disclosure of Invention
The invention aims to provide a hot-rolled pickled steel plate for a refrigerator compressor shell and a manufacturing method thereof, and mainly solves the technical problems that the hot-rolled pickled steel plate for the refrigerator compressor shell is low in stamping performance and the lug making defect occurs in the process of stamping the refrigerator compressor shell.
Through years of research, the applicant finds that the hot-rolled pickled steel plate has more lug making defects, and has the problems of inherent performance of the hot-rolled pickled steel plate, material processing technology, dies and the like. The analysis of the various properties of the hot-rolled pickled steel plate shows that the stamping lug defect is mainly caused by the fact that the plate has anisotropy, so that the hot-rolled pickled steel plate is required to have better plane isotropy in deep stamping, namely, the smaller the plane anisotropy index delta r is, the better the hot-rolled pickled steel plate is. At present, the | Δ r | of the hot-rolled pickled steel plate for the compressor shell of the existing refrigerator is 0.200-0.275, and is too large, so that the requirement of the compressor shell of the refrigerator on the stamping earing rate cannot be met.
Through numerical simulation calculation and numerous experimental studies, the applicant accidentally finds that when the | delta r | is less than or equal to 0.12 during deep drawing of the hot-rolled pickled steel plate, a better stamping forming effect can be obtained, and the stamping lug making defect cannot occur.
The technical idea of the invention is that the hot-rolled pickled steel plate obtained by adopting proper chemical components, hot-rolling process and pickling process has good stamping performance, the Delta r |, of the hot-rolled pickled steel plate is controlled to be less than or equal to 0.12, and the requirement of deep-drawing processing for preparing the shell of the refrigerator compressor is met.
The invention adopts the technical scheme that a hot-rolled pickled steel plate for a refrigerator compressor shell comprises the following chemical components in percentage by weight: c: 0.040-0.065%, Si: 0-0.034%, Mn: 0.17-0.27%, P: 0-0.018%, S: 0-0.013%, Alt: 0.02-0.06%, Nb: 0-0.005%, Ti: 0 to 0.005%, and the balance of Fe and inevitable impurity elements.
The metallographic structure of the hot-rolled pickled steel plate is ferrite and a small amount of pearlite, and the grain size of the ferrite is 7.0-8.0 grade; yield strength R of hot-rolled pickled steel plate with thickness of 2.6-3.5 mmp0.2190-300 MPa, transverse and longitudinal yield strength difference less than or equal to 25MPa, and tensile strength Rm270 to 440MPa, a yield ratio of 0.6 to 0.7, and a post-fracture elongation A50mm37 to 65%, n value of the hot-rolled pickled steel plate is not less than 0.15, r value is not less than 0.75, plastic strain ratio anisotropy degree Delta r | is not more than 0.12, and convexity of the hot-rolled pickled steel plate is 20 to 40 μm.
The reason why the chemical composition of the hot-rolled pickled steel sheet for a refrigerator compressor casing according to the present invention is limited to the above range is as follows:
carbon: carbon is the main alloying element in steel, and as the carbon content increases, the strength and hardness of the steel increase, while the plasticity and impact toughness decrease. The invention is designed with low carbon, when the carbon content is more than 0.065%, the plasticity and toughness of the steel are reduced, which is not beneficial to cold stamping processing, but when the carbon content is less than 0.04%, the requirement on the strength can not be met. In order to ensure the obdurability of the steel, the content of C is set to be 0.040-0.065%.
Silicon: the silicon has stronger deoxidizing capacity, generates slag with FeO in molten steel, removes the adverse effect of the FeO on the steel quality, can be dissolved in ferrite to generate solid solution strengthening, improves the strength and the hardness of the steel, and is a beneficial element in the steel. However, the silicon content is too high, the plasticity and toughness of the material are reduced, and the high-silicon design can generate red iron sheets on the surface of the material, so that certain influence is generated on the surface quality, and the Si content designed by the invention is less than or equal to 0.034 percent.
Manganese: manganese is a beneficial element in steel, has good deoxidizing capacity, can remove FeO in steel, reduces the brittleness of steel, synthesizes MnS with sulfuration, can lighten the harmful effect of sulfur, can be dissolved in ferrite to form a replacement solid solution, generates solid solution strengthening, improves the strength and the hardness of the steel, can obtain a small yield ratio, is beneficial to stamping and forming, but increases the structure segregation in the steel when the content of Mn is too high, influences the structure uniformity and the impact property of the steel, and can increase the strength and the cost. Considering the cost and the performance of the material, the Mn content of the invention is 0.17-0.27%.
Phosphorus: phosphorus is carried in by ores during iron making, can be dissolved in ferrite at normal temperature, improves the strength and hardness of steel, and is easy to generate segregation on grain boundaries, thereby causing segregation and reducing the plasticity and toughness of a steel plate. In general steel, phosphorus is a harmful element and should be strictly controlled. Therefore, in the present invention, P is controlled to be less than or equal to 0.018%.
Sulfur: the sulfur is brought in by the ore and the fuel during the iron making, is insoluble in the iron and exists in the form of a compound FeS, the FeS and the Fe form eutectic with low melting point (the melting point is 985 ℃) and are distributed on the grain boundary of austenite, and when the steel is subjected to hot processing at 1000-1250 ℃, the eutectic at the grain boundary is melted, so that the steel becomes brittle, the toughness is reduced, and the stamping processing is not facilitated. Therefore, the S content in the steel should be as small as possible, and in the present invention, the S content is controlled to 0.013% or less.
Aluminum: the aluminum is a common deoxidizer in steel, and a small amount of aluminum is added into the steel, so that grains can be refined, the impact toughness is improved, and the aluminum is beneficial to stamping processing. However, the defect of aluminum is that the hot workability, the welding performance and the cutting workability of steel are influenced, so the service performance of the material is comprehensively considered, and the content of Al in the invention is 0.02-0.06%.
Niobium: nb can refine grains, so that the toughness and the processing performance of the steel are effectively improved, but because Nb is expensive, the manufacturing cost is fully considered on the premise that other elements can properly play the function of the Nb element, so that the Nb element is not added, and the structure and the mechanical property of the steel plate are not influenced.
Titanium: ti is a strong carbonitride forming element, and the strength can be effectively improved and the segregation of cementite can be improved by adding a proper amount of Ti into the steel. The invention takes C, Mn steel as the design principle, exerts the function of Ti element, and fully considers the needed strength and the manufacturing cost, therefore, the invention does not add Ti element, and has no influence on the structure and the mechanical property of the steel plate.
The method for manufacturing the hot-rolled pickled steel plate for the refrigerator compressor shell comprises the following steps:
continuously casting molten steel to obtain a continuous casting slab, wherein the molten steel comprises the following chemical components in percentage by weight: c: 0.040-0.065%, Si: 0-0.034%, Mn: 0.17-0.27%, P: 0-0.018%, S: 0-0.013%, Alt: 0.02-0.06%, Nb: 0-0.005%, Ti: 0 to 0.005% and the balance of Fe and inevitable impurity elements;
heating the continuous casting plate blank to 1170-1210 ℃ by a heating furnace, and then carrying out hot rolling, wherein the hot rolling is a two-stage rolling process, the rough rolling is 5-pass continuous rolling, the rolling is carried out at a temperature above the austenite recrystallization temperature, and the finish temperature of the rough rolling is 1020-1060 ℃; after rough rolling, controlling the thickness of the intermediate blank to be 38-40 mm; the finish rolling is 7-pass continuous rolling, the finish rolling is carried out in an austenite single-phase region, the finish rolling temperature is 900-930 ℃, after the finish rolling, the thickness of the steel plate is controlled to be 2.6-3.5 mm, the convexity of the steel plate is controlled to be 20-40 mu m, the laminar cooling adopts the post-stage cooling, and the laminar cooling speed is 30-70 ℃/s; obtaining a hot rolled steel coil by coiling at the coiling temperature of 570-610 ℃;
and re-uncoiling the hot-rolled steel coil on an uncoiler, and coiling to obtain a finished hot-rolled pickled steel plate through straightening, pickling, wherein the straightening elongation is 0.60-0.90%.
The production process adopted by the invention has the following reasons:
1. setting of heating temperature of continuous casting slab
The continuous casting plate blank is heated in a heating furnace, which is the first process of hot rolling production, the plate blank heating temperature is too high, more iron scales can be formed on the surface of the continuous casting plate, in the rough rolling process, the scale removal can not completely remove the iron scales on the surface of the continuous casting plate, so that in the subsequent finish rolling, the part of the iron scales which are not removed is pressed into a steel plate, surface defects are formed, and the surface quality requirements of products can not be met; if the heating temperature of the continuous casting slab is too low, the final rolling is adversely affected, and the heating temperature is insufficient, which leads to an increase in rolling load. Therefore, the heating temperature of the continuous casting slab is set to 1170-1210 ℃.
2. Setting of roughing finishing temperature
The rough rolling finishing temperature directly determines the amount of iron scales on the surface of the intermediate billet, and the rough rolling finishing temperature is too high, so that excessive secondary iron scales are formed on the surface of the intermediate billet, and descaling cannot be completely removed in the finish rolling process, so that the surface quality defect of a finished hot-rolled pickled plate occurs; meanwhile, the rough rolling finishing temperature is too high, the heating temperature of the continuous casting slab needs to be increased, and the energy consumption is increased. However, the finish temperature of rough rolling cannot be too low in order to enable the subsequent finish rolling to achieve the austenitic region rolling. Therefore, considering comprehensively, the rough rolling finishing temperature of the invention is set to be 1020-1060 ℃.
3. Setting of thickness of intermediate blank
The intermediate billet is a billet obtained after rough rolling, the purpose of increasing the heat preservation effect can be achieved by increasing the thickness of the intermediate billet, and the final rolling temperature of the steel plate is favorably ensured, so that the recovery of the structure and the crystal grains is favorably realized, the crystal grains are more equiaxial, and the difference of the performance of the material is reduced. However, since the thickness of the intermediate slab is too large, the load of the finish rolling mill is increased, and the rolling control is not facilitated, the thickness of the intermediate slab is set to 38 to 40 mm.
4. Setting of finish Rolling finishing temperature
When a steel sheet is finish rolled in a two-phase region, a mixed grain structure occurs, and the mixed grain causes a difference in the material in the properties in each direction, and defects such as earing occur during stamping, so that the finish rolling temperature needs to be higher than A of the materialr3Transformation point of A of the steelr3The temperature of the phase transition point was 860 ℃. The purpose of the scheme is to obtain the hot-rolled pickled plate with good stamping performance, the finish rolling temperature can be slightly higher, so that the dislocation density in austenite is favorably reduced, but the grains are abnormally large due to the overhigh temperature, and the stamping performance of the material is not favorably improved. Therefore, the temperature drop of the left and right sides in the width direction of the plate is fully considered, and the finish rolling temperature is set to 900-930 ℃.
5. Setting of laminar cooling method and cooling rate
By controlling the cooling mode and the cooling speed of the steel plate after finish rolling, expected metallographic structure and mechanical properties can be obtained. By adopting the rear section cooling mode, the retention time of the strip steel in the high-temperature section can be prolonged, the recovery of the structure crystal grains is more sufficient, the growth of the crystal grains is increased, the equiaxial performance is realized, and the performance difference in the transverse direction, the longitudinal direction and the 45-degree direction is reduced. In addition, through the control of the cooling speed, the recovery growth crystal grain shape is about equiaxial, and the transverse and longitudinal performance difference of the fiber-shaped crystal grains after finish rolling is improved. Therefore, the laminar cooling mode is set as the back-end cooling mode, and the cooling speed is 30-70 ℃/s.
6. Setting of coiling temperature in Hot Rolling
The coiling temperature has certain influence on the surface quality and the mechanical property of the steel plate, and the coiling temperature is too high, so that more iron scales are generated on the surface of the steel plate, the subsequent pickling is not favorable, and the surface quality of a finished product is influenced. If the coiling temperature is lower, the strength of the steel plate is improved, the elongation is reduced, the adverse effect on stamping forming is generated, stamping cracking is easy to generate in large-scale production, proper high-temperature coiling is beneficial to the recovery of crystal grains, the crystal grains are more equiaxial, the anisotropy of the material is reduced, and the stamping lug defect is prevented. Therefore, the coiling temperature of the present invention is set to 570-610 ℃.
7. Setting of hot-rolled sheet crown
In order to ensure that the steel plate does not move on two sides in the rolling process, the width direction of the hot rolled steel plate is usually slightly thinner on two sides and thicker in the middle. In hot rolling, the convexity of the roller can be adjusted, so that the convexity adjusting value of the roller just offsets the variable quantity of the elastic deformation of the roller caused by the change of the rolling force, and good plate shape is ensured to be obtained. However, if the convexity is too large, the thickness variation in the width direction of the sheet is large, and defects such as wrinkles are generated at the time of press working. The steel plate has a convexity of 20-40 μm.
8. Setting of withdrawal and straightening elongation
Before pickling, the steel plate is pulled and straightened, the steel plate is repeatedly bent and straightened through mechanical external force, the combination of iron scales on the surface of the steel plate and a matrix can be damaged, and better surface quality can be obtained after pickling; after stretching, bending and straightening, the wavy edges, the wavy shape, the buckling and the slight camber of the plate surface can be eliminated, so that the flatness of the steel plate is greatly improved; since the yield limit of the deep-drawn thin plate in the longitudinal direction and the transverse direction is always anisotropic, the thickness of each part of the drawn material is uneven due to different extensions of each part during deep-drawing, and the drawn material has a skirt lace defect, thereby increasing the drawing waste rate, and being beneficial to improving the anisotropy of the material after straightening by stretching and bending. However, if the straightening ratio is too high, the work hardening of the steel sheet becomes severe, and the elongation and formability are reduced. Therefore, the withdrawal and straightening ratio is set to 0.60 to 0.90% in the present invention.
The metallographic structure of the hot-rolled pickled steel plate produced by the method is ferrite and a small amount of pearlite, and the grain size of the ferrite is 7.0-8.0 grade; yield strength R of hot-rolled pickled steel sheetp0.2190-300 MPa, transverse and longitudinal yield strength difference less than or equal to 25MPa, and tensile strength Rm270 to 440MPa, a yield ratio of 0.6 to 0.7, and a post-fracture elongation A50mm37 to 65%, n value of the hot-rolled pickled steel plate is not less than 0.15, r value is not less than 0.75, plastic strain ratio anisotropy degree Delta r | is not more than 0.12, and convexity of the hot-rolled pickled steel plate is 20 to 40 μm.
The hot-rolled pickled steel plate obtained by adopting a proper hot-rolling process and pickling process design has good stamping performance with lower alloy cost and wider production manufacturing process window, and is particularly suitable for manufacturing refrigerator compressor shells.
Compared with the prior art, the invention has the following positive effects: 1. according to the method, the thickness of the intermediate blank is increased by controlling the rough rolling reduction, the thickness of the intermediate blank is 38-40 mm, and the thickness of the intermediate blank is increased, so that the heat dissipation speed of a steel plate is reduced, the heat preservation effect is improved, the finish rolling temperature is favorably ensured, the recovery of tissues and crystal grains is favorably realized, the crystal grains of the obtained material are more equiaxial, and the difference of the performance of the material in each direction is reduced; 2. the method adopts a back-end cooling mode, the cooling speed is 30-70 ℃/s, the time of the strip steel in a high-temperature period can be prolonged, the recovery of structure crystal grains is more sufficient, the growth of the crystal grains is increased, the crystal grains of the material are more equalAnd the shaft reduces the performance difference in the transverse direction, the longitudinal direction and the 45-degree direction. 3. The finish rolling finishing temperature adopted by the method is 900-930 ℃, and the finish rolling finishing temperature is Ar3The occurrence of mixed crystals can be reduced by more than one line; the coiling temperature is 570-610 ℃, and the high-temperature coiling is favorable for the recovery of the crystal grains. The crystal grains are more equiaxial, so that the anisotropy of the material is reduced, and the lug making defects are not generated during stamping of the material. 4. The hot-rolled pickled plate has good deep drawing performance and small plane anisotropy, and when the hot-rolled pickled plate is used for deep drawing processing to prepare the shell of the refrigerator compressor, the lug making defect can not occur, so that the high-efficiency and high-quality production is realized.
Drawings
FIG. 1 is a photograph of a metallographic structure of a hot-rolled pickled steel sheet according to example 1 of the present invention.
Detailed Description
The present invention is further illustrated in the following examples 1 to 5, and as shown in tables 1 to 4, it is to be understood that the following detailed description is illustrative of the present invention and is not intended to limit the scope of the present invention.
Table 1 shows the chemical composition (in weight%) of the steels of the examples of the invention, the balance being Fe and unavoidable impurities.
Table 1 chemical composition of the steels of the examples of the invention, in units: and (4) weight percentage.
Smelting in a converter to obtain molten steel meeting the requirements of chemical components, and continuously casting the molten steel to obtain a continuous casting slab; the thickness of the continuous casting slab is 210-230 mm, the width is 900-1650 mm, and the length is 8000-11000 mm.
And (3) conveying the plate blank produced by steel making to a heating furnace of a hot rolling mill for reheating, discharging and removing phosphorus, and conveying to a hot continuous rolling mill for rolling. Controlling rolling through a rough rolling mill and a finish rolling continuous mill unit, coiling after laminar cooling, and producing qualified hot rolled steel coils by adopting post-stage cooling for laminar cooling; the thickness of the hot rolled steel plate is 2.6-3.5 mm. The hot rolling process control parameters are shown in Table 2.
TABLE 2 Hot Rolling Process control parameters of the inventive examples
And re-uncoiling the hot-rolled steel coil on an uncoiler, and coiling to obtain a finished hot-rolled pickled steel plate after straightening and pickling, wherein the straightening elongation is 0.60-0.90%. The withdrawal and straightening rates adopted in the examples of the present invention are shown in table 3.
TABLE 3 withdrawal rate of examples of the invention
| Hot rolling parameters | Thickness/mm of hot-rolled pickled steel sheet | Withdrawal rate/%) |
| The invention | 2.6～3.5 | 0.60～0.90 |
| Example 1 | 2.6 | 0.85 |
| Example 2 | 2.8 | 0.79 |
| Example 3 | 3.0 | 0.75 |
| Example 4 | 3.2 | 0.69 |
| Example 5 | 3.5 | 0.60 |
Referring to fig. 1, the hot-rolled pickled steel plate obtained by the method has a metallographic structure of ferrite and a small amount of pearlite, and the grain size of the ferrite is 7.0-8.0 grade; yield strength R of hot-rolled pickled steel sheetp0.2190-300 MPa, transverse and longitudinal yield strength difference less than or equal to 25MPa, and tensile strength Rm270 to 440MPa, a yield ratio of 0.6 to 0.7, and a post-fracture elongation A50mm37 to 65%, n value of the hot-rolled pickled steel plate is not less than 0.15, r value is not less than 0.75, plastic strain ratio anisotropy degree Delta r | is not more than 0.12, and convexity of the hot-rolled pickled steel plate is 20 to 40 μm.
The hot-rolled pickled steel plate obtained by the invention is subjected to a tensile test according to GB/T228.1-2010 part 1: the tensile test is carried out according to the room temperature test method, the fracture of the material is toughness fracture as can be seen from the tensile fracture of the hot-rolled pickled steel plate, and the mechanical properties are shown in Table 4.
TABLE 4 mechanical Properties of Hot-rolled pickled Steel sheets according to examples of the present invention
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (6)
1. A hot-rolled pickled steel plate for a refrigerator compressor shell comprises the following chemical components in percentage by weight: c: 0.040-0.065%, Si: 0-0.034%, Mn: 0.17-0.27%, P: 0-0.018%, S: 0-0.013%, Alt: 0.02-0.06%, Nb: 0-0.005%, Ti: 0 to 0.005% and the balance of Fe and inevitable impurity elements; the metallographic structure of the hot-rolled pickled steel plate is ferrite and a small amount of pearlite, and the grain size of the ferrite is 7.0-8.0 grade.
2. The hot-rolled pickled steel plate for refrigerator compressor casing as claimed in claim 1, wherein the yield strength R of the hot-rolled pickled steel plate having a thickness of 2.6 to 3.5mmp0.2190-300 MPa, transverse and longitudinal yield strength difference less than or equal to 25MPa, and tensile strength Rm270 to 440MPa, a yield ratio of 0.6 to 0.7, and a post-fracture elongation A50mm37 to 65 percent, the n value of the hot-rolled pickled steel plate is more than or equal to 0.15, the r value is more than or equal to 0.75, and the plastic strain ratio anisotropy degree Delta r-is less than or equal to 0.12.
3. The hot-rolled pickled steel plate for refrigerator compressor casing as claimed in claim 1, wherein the hot-rolled pickled steel plate has a crown of 20 to 40 μm.
4. A method for manufacturing a hot-rolled pickled steel plate for a refrigerator compressor shell is characterized by comprising the following steps:
continuously casting molten steel to obtain a continuous casting slab, wherein the molten steel comprises the following chemical components in percentage by weight: c: 0.040-0.065%, Si: 0-0.034%, Mn: 0.17-0.27%, P: 0-0.018%, S: 0-0.013%, Alt: 0.02-0.06%, Nb: 0-0.005%, Ti: 0 to 0.005% and the balance of Fe and inevitable impurity elements;
heating the continuous casting plate blank to 1170-1210 ℃ by a heating furnace, and then carrying out hot rolling, wherein the hot rolling is a two-stage rolling process, the rough rolling is 5-pass continuous rolling, the rolling is carried out at a temperature above the austenite recrystallization temperature, and the finish temperature of the rough rolling is 1020-1060 ℃; after rough rolling, controlling the thickness of the intermediate blank to be 38-40 mm; the finish rolling is 7-pass continuous rolling, finish rolling is carried out in an austenite single-phase region, the finish rolling temperature is 900-930 ℃, the thickness of the steel plate is controlled to be 2.6-3.5 mm after finish rolling, post-stage cooling is adopted for laminar cooling, and the laminar cooling speed is 30-70 ℃/s; obtaining a hot rolled steel coil by coiling at the coiling temperature of 570-610 ℃;
and re-uncoiling the hot-rolled steel coil on an uncoiler, and coiling to obtain a finished hot-rolled pickled steel plate through straightening, pickling, wherein the straightening elongation is 0.60-0.90%.
5. The method of manufacturing a hot-rolled pickled steel sheet for a refrigerator compressor casing according to claim 4, wherein the steel sheet is controlled to have a crown of 20 to 40 μm after the finish hot rolling.
6. The method of manufacturing a hot-rolled pickled steel sheet for a refrigerator compressor casing according to claim 4, wherein the hot-rolled pickled steel sheet has a metallographic structure of ferrite + a small amount of pearlite, and the grain size of the ferrite is in the range of 7.0 to 8.0; yield strength R of hot-rolled pickled steel sheetp0.2190-300 MPa, transverse and longitudinal yield strength difference less than or equal to 25MPa, and tensile strength Rm270 to 440MPa, a yield ratio of 0.6 to 0.7, and a post-fracture elongation A50mm37 to 65 percent, the n value of the hot-rolled pickled steel plate is more than or equal to 0.15, the r value is more than or equal to 0.75, and the plastic strain ratio anisotropy degree Delta r-is less than or equal to 0.12.
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Cited By (1)
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| CN115679210A (en) * | 2022-10-26 | 2023-02-03 | 邯郸钢铁集团有限责任公司 | Hot-rolled pickled plate for eliminating surface black steel defects and production method thereof |
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