CN113584397A - Steel plate for air-conditioning compressor and production method thereof - Google Patents
Steel plate for air-conditioning compressor and production method thereof Download PDFInfo
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- CN113584397A CN113584397A CN202110915069.7A CN202110915069A CN113584397A CN 113584397 A CN113584397 A CN 113584397A CN 202110915069 A CN202110915069 A CN 202110915069A CN 113584397 A CN113584397 A CN 113584397A
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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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- 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
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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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- 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
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
Abstract
A steel plate for an air conditioner compressor comprises the following chemical components in percentage by weight: 0.04-0.075% of C, less than or equal to 0.05% of Si, 0.10-0.30% of Mn, less than or equal to 0.025% of P, less than or equal to 0.015% of S, 0.01-0.050% of Als, and the balance of Fe and inevitable impurity elements, wherein the stress-strain curve of the steel plate material has a yield platform, and the yield strength is 210-290 MPa. The steel plate production process flow comprises hot continuous rolling, flattening and acid pickling of a plate blank, and in the flattening process, a flattening unit adopts a constant rolling force mode, the rolling force requirement is 1400-1700 KN, the inlet tension is 60-80 kN, and the outlet tension is 190-300 kN. The problem of bad general rule of the main casing body prepared by the pickling plate for the air condition compressor is solved, and the preparation requirement of the main casing body of the air condition compressor and the assembly requirement of the rotor and the stator are met.
Description
Technical Field
The invention belongs to the technical field of steel rolling and plate application in the metallurgical industry, and particularly relates to a steel plate for an air-conditioning compressor and a production method thereof.
Background
The main components of the air conditioner compressor comprise a main shell, an end cover stamping part, a rotor and a stator in the shell, a related pipeline and the like. The production process flow of the main shell of the air-conditioning compressor comprises the following steps: the hot-rolled pickled plate is longitudinally cut and coiled (sized according to the model) → uncoiling → a disc loop → a coiled and pressed pipe → a high-frequency welded pipe → laminar cooling → a welded pipe is sized and cut (6-9 m unequal) → a main shell sizing and cut pipe (sized according to the model) → a primary expansion pipe → a main shell fracture cutting → punching → a resistance welding bracket → a brazed copper pipe → fine expansion (twice) → general gauge detection.
The general gauge detection is needed to be carried out after the secondary fine expansion in the preparation process of the main shell of the air conditioner compressor, and the inner diameters of different types of main shells are different in size, but the general gauge detection is needed to be carried out. The fine expansion adopts hydraulic pipe expansion, the plate rolling performance is required to be more stable after the pipe expansion parameters are set, and the frequent fluctuation of the inner diameter of the pipe expansion is avoided. If the inner diameter is lower than the lower limit, the through gauge cannot be detected smoothly, the through gauge is unqualified, or the defective rate of the through gauge at one time is high, so that the production efficiency of a production line is influenced. If the inner diameter is on the upper limit, the stator adhered to the inner wall of the main shell is easy to slip and dislocate during subsequent assembly of the movement although the through gauge is qualified, and offset friction occurs between the rotor and the stator, so that safety accidents are caused.
Disclosure of Invention
Aiming at the problem of unqualified through gauge detection in the machining process of the main shell of the air conditioner compressor, the following research and analysis are carried out:
the main shell of the air-conditioning compressor is prepared in a mode that a pickling plate is longitudinally cut, rolled and pressed to form a tube and a high-frequency welded tube, primary expansion tube and fine expansion are both transverse stress (vertical to the axial direction of a tube body) of a main shell tube body, important parameters of hydraulic expansion tube expansion are transverse displacement of an expansion die, the transverse displacement is large, namely the inner diameter of the tube body is large, and the method is favorable for passing a gauge. Under the condition of the same pipe expansion parameters, the material performance is stable, and the expanded inner diameter size is consistent, so that the improvement of the sheet material through-rolling performance stability is necessary.
The yield phenomenon exists in the process of stretching deformation of the low-carbon steel SPHC sheet, an obvious yield platform exists in a stress-strain curve, an elastic deformation area exists before yield, and plastic irreversible deformation occurs on the yield platform and later. For the pipe expanding process, the transverse performance of the plate is important for the expansion of the inner diameter and whether the expanded plate rebounds or not. If the yield strength of the material is high, the requirement on roundness and inner diameter can be met only by needing larger pipe expansion force, and the pipe expansion processing is not facilitated, so that the yield strength is reduced as far as possible while the hardness is guaranteed.
If the material strain that the expand tube process leads to is in the elastic deformation district, then can appear the internal diameter and reduce promptly the phenomenon of kick-backing after getting rid of the expand tube power, easily lead to leading to the rule bad. If the material strain exceeds the yield to generate plastic deformation, the rebound phenomenon can not occur after the pipe expansion force is removed, and the general gauge is smooth.
The trial effect of a tracking client and the analysis of a sample show that the reduction of the yield strength of the plate is beneficial to the processing of the main shell, the stability of the rolling performance of the material is improved, the stability of the inner diameter of the expanded pipe can be ensured under the condition that the expansion parameters (the displacement stroke of the expanded pipe) are not frequently changed, frequent repair (three times/four times of fine expansion) is not needed, and the pass percent of pass of one pass is improved.
The technical scheme adopted by the invention is as follows: a steel plate for an air conditioner compressor comprises the following chemical components in percentage by weight: 0.04-0.075% of C, less than or equal to 0.05% of Si, 0.10-0.30% of Mn, less than or equal to 0.025% of P, less than or equal to 0.015% of S, 0.01-0.050% of Als, and the balance of Fe and inevitable impurity elements, wherein the stress-strain curve of the steel plate material has a yield platform, and the yield strength is 210-290 MPa.
Further, the microstructure of the steel plate is polygonal ferrite and a small amount of grain boundary precipitated carbide.
Furthermore, the tensile strength of the steel plate is more than or equal to 300MPa, the elongation is 35-50%, and the hardness is 58 +/-6 HRB.
The production method of the steel plate for the air-conditioning compressor comprises the following steps: the steel plate production process flow comprises hot continuous rolling, flattening and acid pickling of a plate blank, and in the flattening process, a flattening unit adopts a constant rolling force mode, the rolling force requirement is 1400-1700 KN, the inlet tension is 60-80 kN, and the outlet tension is 190-300 kN.
Further, in the hot continuous rolling process, the cooling mode of laminar cooling after finish rolling is to close the front three groups of cooling water + front section centralized cooling, and the coiling temperature is 590-610 ℃.
Further, in the hot continuous rolling process, the heating temperature of the plate blank in a heating furnace is 1230-1250 ℃.
Further, in the hot continuous rolling process, the finishing temperature in the finish rolling process is 890-910 ℃.
The cooling mode of laminar cooling after finish rolling is that the front three groups of cooling water are turned off and the front section is intensively cooled, namely the front three groups of cooling water column switches are turned off through the setting of a secondary model, and the centralized cooling mode is adopted after the three groups of cooling water columns.
The stress-strain curve of the steel plate material has a yield platform, the yield strength is 210-290 MPa, the microstructure of the steel plate is polygonal ferrite and a small amount of grain boundary precipitated carbide, the tensile strength of the steel plate is more than or equal to 300MPa, the elongation is 35-50%, the hardness is 58 +/-6 HRB, and the structure and performance indexes of the steel plate are the performance indexes of the pickled plate after acid washing.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the problem of bad general rule of the main casing body prepared by the pickling plate for the air condition compressor is solved, and the preparation requirement of the main casing body of the air condition compressor and the assembly requirement of the rotor and the stator are met. The good matching of the product performance and the preparation requirement of the main shell of the air-conditioning compressor is realized. The invention provides technical support for expanding the market of the pickling plate of the air-conditioning compressor and contributes to the steel strength for the safe and high-quality development of the white household appliance industry.
Drawings
FIG. 1 is a tensile stress-strain curve before flattening a steel plate;
FIG. 2 is a tensile stress-strain curve of a flattened steel plate;
FIG. 3 is a stress-strain curve of a steel plate before flattening and after flattening in a/'high tension and low rolling force' mode;
FIG. 4 is an enlarged view of a stress-strain curve yield platform after flattening in a/'high tension and low rolling force' mode before flattening of a steel plate;
FIG. 5 is the microstructure morphology of the pickled plate of example 1;
FIG. 6 is the microstructure morphology of the pickled plate of example 2;
FIG. 7 is the microstructure morphology of the pickled plate of example 3;
FIG. 8 is the microstructure morphology of the pickled plate of example 4;
FIG. 9 shows the microstructure of the pickled plate of example 5;
FIG. 10 is the microstructure morphology of the pickled plate of example 6.
Detailed Description
The reason for establishing the process parameters will be explained below.
And in the leveling process, a leveling unit adopts a constant rolling force mode, the rolling force requirement is 1400-1700 KN, the inlet tension is 60-80 kN, and the outlet tension is 190-300 kN.
The flattening process mainly aims at improving the plate shape and eliminating the defects of yield platforms and transverse fractures of the low-carbon steel. The flattening rolling force is too large, the yield platform can be completely eliminated, the elastic deformation area is enlarged, the rebound tendency is serious, and the gauge is not beneficial to gauge setting. A "high tension low rolling force" mode is used to ensure good plate shape while preserving the yield plateau, as shown in fig. 3 and 4. In the attached drawings 3 and 4, a curve 1 is a stress-strain curve of the steel plate before flattening, a longer yield platform exists, a curve 2 is a stress-strain curve of the steel plate after flattening by adopting a large-tension small-rolling-force mode, a part of the yield platform is reserved, so that the stress of the expansion pipe exceeds an elastic deformation area to generate yield and plastic deformation, the rebound phenomenon does not occur after the stress of the expansion pipe is removed, and the through gauge detection is facilitated.
And a hot continuous rolling process, wherein the cooling mode of laminar cooling after finish rolling is closing the front three groups of cooling water and front section centralized cooling, and the coiling temperature is 590-.
The finish rolling temperature of the finish rolling procedure is 890-910 ℃, the austenite zone rolling is ensured, and the mixed crystal phenomenon caused by the two-phase zone rolling is avoided. The adoption of a laminar cooling mode of closing the front three groups of cooling water and front section concentrated cooling can promote the recrystallization of finish rolling deformation austenite, so that the phase change ferrite coarsens and reduces the yield strength. The plate shape can be improved by adopting a laminar cooling mode of closing the front three groups of cooling water and front section centralized cooling and coiling at the temperature of 590-.
And (3) a hot continuous rolling procedure, namely heating the plate blank in a heating furnace at the heating temperature of 1230-1250 ℃.
The hot coil box has obvious effect of improving the stability of coil passing performance, and for a conventional hot continuous rolling production line which is not provided with the hot coil box, the functions of the hot coil box can be compensated only by other modes, specifically comprising the steps of increasing the heating temperature of a casting blank to 1230 plus 1250 ℃, compensating the tail temperature of the casting blank by +30 ℃, putting a heat preservation cover on an intermediate blank, putting an edge heater on the intermediate blank and compensating the temperature of the edge by +50 ℃, and the measures can effectively reduce the length direction and the transverse temperature drop of the intermediate blank in the process of waiting for rolling and improve the stability of the coil passing performance.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The steelmaking process adopts a converter or an electric furnace for smelting, and the qualified molten steel after LF refining or RH refining is continuously cast into a plate blank; the slab comprises the following chemical components in percentage by weight: 0.04-0.075% of C, less than or equal to 0.05% of Si, 0.10-0.30% of Mn, less than or equal to 0.025% of P, less than or equal to 0.015% of S, 0.01-0.050% of Als, and the balance of Fe and inevitable impurity elements.
The microstructure, the mechanical property and the stability of the coil passing performance of the pickled plate are controlled by a hot rolling process, and the method specifically comprises the following steps: heating a plate blank → R1+ R2 rough rolling → a heat preservation cover + an edge heater → F1-F7 finish rolling → laminar cooling → coiling → concentrated stacking slow cooling (or slow cooling in a wind screen) → hot rolling of a finished product, wherein the heating temperature of the plate blank is 1230-1250 ℃, the heat preservation is carried out for 30-90 min, the tail temperature of a casting blank is compensated by +30 ℃, the heat preservation cover is used for casting an intermediate blank, the thickness of the intermediate blank is controlled to be 35-43mm, the edge heater is used for casting the intermediate blank, and the edge temperature is compensated by +50 ℃. In the rough rolling procedure, a 3+ 3-pass mode is adopted by R1+ R2, and a 3+ 5-pass mode can be adopted if 3+ 3-pass slipping or the camber of the intermediate billet exceeds +/-30 mm, the initial rolling temperature is 1150-1250 ℃, and the final rolling temperature is 1050-1200 ℃; and removing secondary scale before finish rolling of the intermediate billet, wherein the descaling temperature is 1000-1150 ℃, and the secondary descaling water pressure is more than or equal to 18 MPa. The accumulated reduction in the rough rolling process is 80-85%. The initial rolling temperature of finish rolling is 1010-1060 ℃, the final rolling temperature is 890-910 ℃, the cumulative reduction of finish rolling is 85-98.5%, and the finish rolling speed is stabilized at 8-13 m/s. The finish rolling temperature of the finish rolling procedure is 890-910 ℃, the front three groups of cooling water and the front section are intensively cooled in a laminar cooling mode, the cooling speed is 18-25 ℃/s after finish rolling, then coiling is carried out, the coiling temperature is 590-.
The flatness and the adjustment performance are improved through a flattening process, a constant rolling force mode is adopted after a hot coil is cooled to below 50 ℃, the rolling force requirement is 1400-1700 KN, the inlet tension is 60-80 kN, the outlet tension is 190-300 kN, a high-tension and low-rolling force mode is adopted to ensure good flatness, and a material yield platform is reserved.
And (4) after the hot coil is leveled, carrying out acid washing to remove surface iron oxide scales, oiling and packaging.
Examples 1 to 6
Examples 1-6 were produced as described above,
the chemical components and the weight percentage content of the produced steel grade are shown in a table 1, the technological parameters of the heating, rough rolling, finish rolling and cooling processes are shown in tables 2 and 3, the technological parameters of the leveling process are shown in a table 4, and the mechanical properties of the pickled plate after acid washing are shown in a table 5.
TABLE 1
TABLE 2
TABLE 3
TABLE 4
TABLE 5
As can be seen from FIGS. 5 to 10, the microstructures obtained in examples 1 to 6 were polygonal ferrite, and a small amount of carbide was precipitated at the grain boundaries. As can be seen from Table 5, the yield strength of the pickled plate is 210-290 MPa, the tensile strength is more than or equal to 300MPa, the elongation can reach 35-50%, the plate material keeps a yield platform, the hardness is 58 +/-6 HRB, the requirement of a pressure resistance experiment after welding and assembling of an air conditioner compressor is met, the main shell is smooth in pass, and the pass fraction defective is less than or equal to 3 per mill.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (7)
1. A steel plate for an air conditioner compressor comprises the following chemical components in percentage by weight: 0.04-0.075% of C, less than or equal to 0.05% of Si, 0.10-0.30% of Mn, less than or equal to 0.025% of P, less than or equal to 0.015% of S, 0.01-0.050% of Als, and the balance of Fe and inevitable impurity elements, wherein the stress-strain curve of the steel plate material has a yield platform, and the yield strength is 210-290 MPa.
2. The steel sheet for an air conditioner compressor according to claim 1, wherein the microstructure of the steel sheet is polygonal ferrite and a small amount of grain boundary precipitated carbides.
3. The steel plate for the air-conditioning compressor as claimed in claim 1, wherein the steel plate has a tensile strength of 300MPa or more, an elongation of 35% to 50%, and a hardness of 58 ± 6 HRB.
4. The method for producing the steel plate for the air-conditioning compressor according to any one of claims 1 to 3, wherein the steel plate production process flow comprises hot continuous rolling, flattening and acid pickling of a plate blank, and is characterized in that a flattening process and a flattening unit adopt a constant rolling force mode, the rolling force requirement is 1400-1700 KN, the inlet tension is 60-80 kN, and the outlet tension is 190-300 kN.
5. The method for producing a steel sheet for an air conditioning compressor as claimed in claim 4, wherein in the hot continuous rolling step, the cooling mode of laminar cooling after finish rolling is closed front three groups of cooling water + front section centralized cooling, and the coiling temperature is 590-610 ℃.
6. The method for producing a steel plate for an air conditioner compressor as claimed in claim 4, wherein the hot continuous rolling step is a step in which the slab is heated in a heating furnace at a temperature of 1230 to 1250 ℃.
7. A method for producing a steel sheet for an air conditioning compressor according to any one of claims 4 to 6, wherein the hot continuous rolling step is a finish rolling step at a finish rolling temperature of 890 to 910 ℃.
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| CN202110915069.7A CN113584397B (en) | 2021-08-10 | 2021-08-10 | Steel plate for air-conditioning compressor and production method thereof |
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| CN202110915069.7A CN113584397B (en) | 2021-08-10 | 2021-08-10 | Steel plate for air-conditioning compressor and production method thereof |
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| CN113584397B CN113584397B (en) | 2022-10-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114054516A (en) * | 2021-11-11 | 2022-02-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of hot-rolled pickled plate for compressor |
| CN114231836A (en) * | 2021-11-11 | 2022-03-25 | 邯郸钢铁集团有限责任公司 | 700L steel strip with stable performance and excellent toughness and production method thereof |
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| CN110747323A (en) * | 2019-10-24 | 2020-02-04 | 马鞍山钢铁股份有限公司 | Acid-washing cold-formed steel and manufacturing method thereof |
| CN111455273A (en) * | 2020-04-07 | 2020-07-28 | 新余钢铁股份有限公司 | Base plate for compressor shell and production method thereof |
| CN113025909A (en) * | 2021-03-09 | 2021-06-25 | 马鞍山钢铁股份有限公司 | Hot-rolled pickled plate for refrigerator compressor shell and production method thereof |
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Cited By (2)
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| CN114054516A (en) * | 2021-11-11 | 2022-02-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of hot-rolled pickled plate for compressor |
| CN114231836A (en) * | 2021-11-11 | 2022-03-25 | 邯郸钢铁集团有限责任公司 | 700L steel strip with stable performance and excellent toughness and production method thereof |
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| CN113584397B (en) | 2022-10-28 |
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