Steel for compressor and preparation method thereof
By adding Ti and Al elements to the steel for compressors, the oxygen and nitrogen content is reduced, and the problem of pores and undercuts are easily encountered after welding, which improves the welding performance and the service life of the material.
Patent Information
- Application Number
- CN202411708079.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2025-02-28
AI Technical Summary
During the high oxygen and nitrogen content of existing compressor housing steels during high-frequency plasma welding, intermittent pores and undercuts are prone to occur after welding, which leads to cracking and scrapping of materials.
By adding Ti elements to the steel for compressors, the oxygen content is reduced by using its strong reducing properties, and combined with N elements to form TiN precipitation, thereby reducing the solid solution N content and improving welding cleanliness and performance. At the same time, the Al element content is increased to further reduce the oxygen content.
It effectively improves the cleanliness of steel used in compressors during high-frequency plasma welding, reduces material cracking during welding, and improves welding performance.
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Figure CN119530650A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of steel technology, and in particular to a steel for compressor and a preparation method thereof. Background Art
[0002] A compressor is a driven fluid machine that raises low-pressure gas to high-pressure gas. It is the heart of the refrigeration system. It sucks low-temperature, low-pressure refrigerant gas from the suction pipe, compresses it through the motor, and discharges high-temperature, high-pressure refrigerant gas to the exhaust pipe, providing power for the refrigeration cycle.
[0003] The main raw material for air conditioner and refrigerator compressor housings is usually steel. The processing flow of compressor housings is: hot-rolled coils → pickling → unrolling and cutting → cleaning → tube coiling → tube shrinking → plasma welding → planing → tube expansion → punching → copper tube welding → inspection and warehousing.
[0004] The key processes of compressor housing processing are plasma welding and pipe expansion. In the high-frequency plasma welding process, if the O and N content of the steel is too high and the cleanliness is poor, intermittent pores and undercuts are likely to appear after welding (due to excessive melting near the fusion line between the parent material and the weld, the transition zone between the molten metal and the parent metal forms a depression), which leads to cracking and scrapping of the material in the pipe expansion process. Therefore, it is very necessary to develop a compressor steel that can meet the requirements of high-frequency plasma welding and high elongation, as well as low production costs and high scrap steel ratio adaptability. Summary of the invention
[0005] In view of the problems existing in the prior art, the embodiments of the present application provide a high-temperature wear-resistant steel and a preparation method thereof, aiming to improve the wear resistance of the wear-resistant steel in a high-temperature environment.
[0006] In a first aspect, the present application provides a steel for a compressor, comprising the following chemical composition by weight: C: 0.035%-0.065%, Si: 0-0.05%, Mn: 0.18%-0.3%, P: 0-0.02%, S: 0-0.01%, Al: 0.035%-0.065%, N: 0-0.007%, Ti: 0.01%-0.03%, and the balance being Fe and unavoidable impurities.
[0007] In the embodiment of the present application, a certain amount of Ti element is added to the compressor steel. Since Ti element has strong reducing property, the oxygen content in the compressor steel can be reduced. At the same time, Ti element can combine with N element to form TiN precipitation during the solidification of the ingot, thereby reducing the solid solution N content in the compressor steel. The reduction of O content and N content can improve the cleanliness during high-frequency plasma welding, thereby reducing the excessive melting of the parent material and the weld during welding, reducing the cracking of the material during welding, and improving the welding performance. Furthermore, in the embodiment of the present application, the Al element content in the compressor steel is increased, thereby further reducing the oxygen content in the compressor steel, thereby improving the welding performance of the steel.
[0008] In some embodiments, the compressor steel includes the following chemical composition in weight percentage: C: 0.04%-0.06%, Si≤0.05%, Mn: 0.18%-0.25%, P≤0.02%, S≤0.006%, Al: 0.045%-0.065%, N≤0.006%, Ti: 0.015%-0.03%, and the rest is Fe and unavoidable impurities.
[0009] In some embodiments, in the chemical composition of the compressor steel, the weight content of the Ti element m(Ti) and the weight content of the N element m(N) satisfy: m(Ti)≥3.42*m(N).
[0010] In some embodiments, the yield strength of the compressor steel is 210 MPa-290 MPa.
[0011] In some embodiments, the elongation A50 of the compressor steel is ≥ 38%.
[0012] In some embodiments, the average hardness HRB of the compressor steel is 54-64.
[0013] In a second aspect, the present application provides a method for preparing steel for a compressor, comprising the following steps:
[0014] The molten iron and the scrap steel are taken for converter smelting to obtain crude molten steel;
[0015] Refining the crude molten steel to obtain refined molten steel, wherein the refined molten steel comprises the following chemical composition in weight percentage: C: 0.035%-0.065%, Si: 0-0.05%, Mn: 0.18%-0.3%, P: 0-0.02%, S: 0-0.01%, Al: 0.035%-0.065%, N: 0-0.007%, Ti: 0.01%-0.03%, and the balance is Fe and unavoidable impurities;
[0016] Continuously casting the refined molten steel to obtain a continuously cast billet;
[0017] The continuously cast billet is hot rolled, cooled, and coiled to obtain a hot rolled steel coil.
[0018] In some embodiments, based on the total mass of the molten iron and the scrap steel, the weight percentage of the scrap steel is 23%-30%.
[0019] In some embodiments, refining the crude molten steel to obtain refined molten steel includes: adding preheated scrap steel to the crude molten steel and refining it to obtain refined molten steel.
[0020] In some embodiments, the preheating temperature of the preheated scrap steel is 550°C-850°C.
[0021] In some embodiments, based on the total mass of the refined molten steel, the weight percentage of the preheated scrap steel is 3%-10%.
[0022] In some embodiments, the refining includes calcium treatment, and soft blowing treatment is performed between the calcium treatments, the soft blowing argon flow rate is 200NL / min-500NL / min, and the soft blowing time is 3min-5min.
[0023] In some embodiments, a soft blowing treatment is further included after the calcium treatment, the soft blowing argon gas flow rate is 200NL / min-400NL / min, and the soft blowing time is 6min-10min.
[0024] In some embodiments, the thickness of the continuous casting billet is 230 mm-240 mm.
[0025] In some embodiments, the hot rolling includes rough rolling and finish rolling, the rough rolling temperature is 1060°C-1100°C, and the finish rolling temperature is 870°C-930°C.
[0026] In some embodiments, the curling temperature is 610°C-660°C. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.
[0028] Figure 1 This is a schematic diagram of a welding product of compressor steel in some embodiments of the present application.
[0029] Figure 2 This is a schematic diagram of intermittent pores in the weld that appear when welding the compressor steel in Comparative Example 1 of the present application.
[0030] Figure 3 This is a schematic diagram of weld undercut that occurs when welding compressor steel in Comparative Example 1 of the present application. DETAILED DESCRIPTION
[0031] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least some of the known structures and technologies are not shown to avoid unnecessary ambiguity in the present application; and, for clarity, the size of some structures may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.
[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish an entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "multiple" is more than two. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only include those elements, but also include other elements not clearly listed, or also include elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements limited by the sentence "include..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements.
[0033] Compressor steel
[0034] An embodiment of the first aspect of the present application provides a steel for a compressor, comprising the following chemical composition in weight percentage: C: 0.035%-0.065%, Si: 0-0.05%, Mn: 0.18%-0.3%, P: 0-0.02%, S: 0-0.01%, Al: 0.035%-0.065%, N: 0-0.007%, Ti: 0.01%-0.03%, and the balance is Fe and unavoidable impurities.
[0035] In the embodiment of the present application, a certain amount of Ti element is added to the compressor steel. Since Ti element has strong reducing property, the oxygen content in the compressor steel can be reduced. At the same time, Ti element can combine with N element to form TiN precipitation during the solidification of the ingot, thereby reducing the solid solution N content in the compressor steel. The reduction of O content and N content can improve the cleanliness during high-frequency plasma welding, thereby reducing the excessive melting of the parent material and the weld during welding, reducing the cracking of the material during welding, and improving the welding performance. Furthermore, in the embodiment of the present application, the Al element content in the compressor steel is increased, thereby further reducing the oxygen content in the compressor steel, thereby improving the welding performance of the steel.
[0036] In some embodiments, the compressor steel may include the following chemical composition in weight percentage: C: 0.035%-0.065%, Si: 0-0.05%, Mn: 0.18%-0.3%, P: 0-0.02%, S: 0-0.01%, Al: 0.035%-0.065%, N: 0-0.007%, Ti: 0.01%-0.03%, and the balance is Fe and unavoidable impurities.
[0037] By adjusting and optimizing the chemical composition of compressor steel within the above range, the steel can have a lower oxygen content and N content, further improving the welding performance of the steel.
[0038] In some embodiments, in the chemical composition of the compressor steel, the weight content of the Ti element m(Ti) and the weight content of the N element m(N) may satisfy: m(Ti)≥3.42*m(N).
[0039] According to the embodiments of the present application, Ti element as a strong reducing element can be combined with N element to form TiN precipitation. Based on the element ratio of Ti element and N element to form TiN, by limiting the weight content of Ti element and the weight content of N element in compressor steel to be within the above-mentioned range, the N element in the compressor steel can be combined with Ti element as much as possible to precipitate, thereby further reducing the content of N element in the compressor steel, thereby improving the welding performance of the steel.
[0040] In some embodiments, the yield strength of the compressor steel is 210 MPa-290 MPa.
[0041] In some embodiments, the tensile strength of the compressor steel is 320 MPa-400 MPa.
[0042] In some embodiments, the elongation A50 of the compressor steel is ≥ 38%.
[0043] In some embodiments, the compressor steel has a hardness HRB of 54-64.
[0044] According to the embodiments of the present application, by adjusting and optimizing the chemical composition of compressor steel, the oxygen content and N content in the steel can be effectively reduced, so that the steel has higher mechanical strength and toughness, and the welding performance of the steel is improved.
[0045] Method for preparing steel for compressor
[0046] The embodiment of the second aspect of the present application provides a method for preparing compression steel, which may include the following steps:
[0047] S10, taking molten iron and scrap steel into the furnace for converter smelting to obtain crude molten steel;
[0048] S20, refining the crude molten steel to obtain refined molten steel, wherein the refined molten steel comprises the following chemical composition in weight percentage: C: 0.035%-0.065%, Si: 0-0.05%, Mn: 0.18%-0.3%, P: 0-0.02%, S: 0-0.01%, Al: 0.035%-0.065%, N: 0-0.007%, Ti: 0.01%-0.03%, and the balance is Fe and unavoidable impurities;
[0049] S30, continuously casting the refined molten steel to obtain a continuously cast billet;
[0050] S40, hot rolling, cooling and coiling the continuous casting billet to obtain a hot rolled steel coil.
[0051] In the embodiments of the present application, conventional molten iron and scrap steel are used as raw materials for compressor steel, which can achieve the recycling of scrap steel, save energy and protect the environment, and the preparation method is relatively simple, the process control difficulty is relatively low, the operability is strong, and the prepared compressor steel has high strength and low production cost, which can meet the requirements of high-frequency plasma welding.
[0052] In some embodiments, based on the total mass of crude molten steel, the mass content of the scrap steel entering the furnace may be 23%-30%. For example, based on the total mass of crude molten steel, the mass content of the scrap steel entering the furnace may be 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, or a range consisting of any of the above values.
[0053] By limiting the content of scrap steel entering the furnace to the above range, the raw material of compressor steel has a higher scrap steel ratio, which can further reduce costs; at the same time, when the scrap steel content is within the above range, the steel produced can maintain high mechanical strength and toughness, and the steel has good welding performance. Based on this, compressor steel can have both high economy and performance, which is conducive to reducing steel costs while maintaining the performance strength of steel.
[0054] In some embodiments, step S20 may include: adding preheated scrap steel to the crude molten steel, and refining to obtain refined molten steel. Adding preheated scrap steel to the crude molten steel can increase the weight of the refined molten steel, and can further adjust the chemical composition of the refined molten steel.
[0055] In some embodiments, the preheating temperature of the preheated scrap steel may be 550° C.-850° C. For example, the preheating temperature of the preheated scrap steel may be 550° C., 560° C., 570° C., 580° C., 590° C., 600° C., 610° C., 620° C., 630° C., 650° C., 680° C., 700° C., 720° C., 750° C., 780° C., 800° C., 820° C., 850° C., or a range consisting of any of the above numerical values.
[0056] In some embodiments, the weight percentage of the preheated scrap steel may be 3%-10% based on the total weight of the refined molten steel. For example, the weight percentage of the preheated scrap steel may be 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, or a range consisting of any of the above values based on the total weight of the refined molten steel.
[0057] By controlling the temperature and amount of preheated scrap steel added to the crude molten steel within the above range, the chemical composition of the refined molten steel can be further adjusted, the content of each component in the molten steel can be balanced, and the resulting steel can have a lower oxygen and nitrogen content, further improving the welding performance of the steel.
[0058] In some embodiments, in step S20, refining may further include calcium treatment, and soft blowing treatment may be performed between the calcium treatments.
[0059] Soft blowing treatment is a refining method in which gas is blown into molten steel according to the structure of molten steel at room temperature and the purpose of treatment to remove non-metallic inclusions. Soft blowing treatment can reduce the gas dissolved in molten steel (such as hydrogen, nitrogen, oxygen, etc.), and remove the remaining non-metallic inclusions (such as oxides, sulfides, nitrides, etc.) in the molten steel. Soft blowing treatment can also make the composition and temperature of molten steel uniform before pouring, reduce the pouring start temperature, realize the normalization of continuous casting process, and improve the impact toughness of steel.
[0060] In some embodiments, the argon gas for the soft blowing treatment may be argon gas, the argon gas flow rate may be 200NL / min-500NL / min, and the soft blowing treatment time may be 3min-5min.
[0061] Exemplarily, the compressed air flow rate can be 200NL / min, 220NL / min, 250NL / min, 280NL / min, 300NL / min, 350NL / min, 380NL / min, 400NL / min, 420NL / min, 450NL / min, 460NL / min, 480NL / min, 500NL / min, or a range consisting of any of the above values.
[0062] In some embodiments, soft blowing treatment may be continued after the calcium treatment, with the soft blowing argon gas flow rate being 200NL / min-400NL / min and the soft blowing time being 6min-10min.
[0063] In some embodiments, the thickness of the continuous casting slab may be 230 mm to 240 mm.
[0064] In some embodiments, hot rolling may include rough rolling and finish rolling.
[0065] In some embodiments, the temperature of the rough rolling may be 1060° C.-1100° C. For example, the temperature of the rough rolling may be 1060° C., 1070° C., 1080° C., 1090° C., 1100° C., or a range consisting of any of the above values.
[0066] In some embodiments, the finishing rolling temperature may be 870°C-930°C. For example, the finishing rolling temperature may be 870°C, 8800°C, 890°C, 900°C, 910°C, 920°C, 930°C, or a range consisting of any of the above values.
[0067] In some embodiments, the curling temperature may be 610° C. to 660° C. For example, the curling temperature may be 610° C., 620° C., 630° C., 640° C., 650° C., 660° C., or a range thereof.
[0068] Example
[0069] The present application is described below with reference to specific examples. It should be noted that the embodiments described below are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. Where specific techniques or conditions are not specified in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be obtained commercially.
[0070] Example 1
[0071] A compressor steel is prepared by the following method:
[0072] S10, using a 210t converter for smelting, adds 152 tons of molten iron and 51 tons of scrap steel into the converter, with the converter scrap steel accounting for 25.1%, and obtains crude molten steel after converter smelting;
[0073] S20, the crude molten steel is transferred to the ladle refining LF furnace for refining. 15 tons of preheated scrap steel is added in the early stage of refining. The preheating temperature of the scrap steel is 743°C. The total scrap steel accounts for 30.72% in the smelting process;
[0074] S30, soft blowing treatment is performed before calcium treatment of the molten steel in the later stage of refining, the soft blowing argon flow rate is 452±20NL / min, and the soft blowing time is 3.5min; after calcium treatment of the molten steel in the later stage of refining, soft blowing operation is performed, the soft blowing argon flow rate is 226±20NL / min, and the soft blowing time is 8.3min; the composition of the refined molten steel obtained is C: 0.0494%, Si: 0.0407%, Mn: 0.1933%, P: 0.0159%, S: 0.0043%, Al: 0.0557%, N: 0.0060%, Ti: 0.0245%, and the balance of Fe and unavoidable impurities;
[0075] S40, continuously casting the refined molten steel to obtain a continuously cast billet with a thickness of 240 mm, and sequentially hot rolling, cooling and curling the continuously cast billet to obtain a hot-rolled coil; wherein the hot rolling includes rough rolling and finish rolling, the average temperature of the rough rolling is 1078°C, the average temperature of the finish rolling is 889°C, and the average temperature of the curling is 633°C.
[0076] Example 2
[0077] A compressor steel is prepared by the following method:
[0078] S10, using a 210t converter for smelting, adding 150 tons of molten iron and 54 tons of scrap steel into the converter, with the converter scrap steel accounting for 26.47%, and obtaining crude molten steel after converter smelting;
[0079] S20, the crude molten steel is transferred to the ladle refining LF furnace for refining. 20 tons of preheated scrap steel is added in the early stage of refining. The preheating temperature of the scrap steel is 698°C. The total scrap steel accounts for 33.04% in the smelting process;
[0080] S30, soft blowing treatment is performed before calcium treatment of the molten steel in the later stage of refining, the soft blowing argon flow rate is 68±20NL / min, and the soft blowing time is 4min; after calcium treatment of the molten steel in the later stage of refining, soft blowing operation is performed, the soft blowing argon flow rate is 234±20NL / min, and the soft blowing time is 8min; the composition of the refined molten steel obtained is C: 0.0598%, Si: 0.0432%, Mn: 0.2005%, P: 0.0179%, S: 0.0052%, Al: 0.0514%, N: 0.0059%, Ti: 0.0228%, and the balance of Fe and unavoidable impurities;
[0081] S40, continuously casting the refined molten steel to obtain a continuously cast billet with a thickness of 240 mm, and sequentially hot rolling, cooling and curling the continuously cast billet to obtain a hot-rolled coil; wherein the hot rolling includes rough rolling and finish rolling, the average rough rolling temperature is 1079°C, the average finish rolling temperature is 888°C, and the average coiling temperature is 631°C.
[0082] Example 3
[0083] The preparation method of compressor steel is similar to that of Example 1, except that the chemical composition of the steel is different, specifically as follows: C: 0.0648%, Si: 0.0495%, Mn: 0.182%, P: 0.0165%, S: 0.0048%, Al: 0.0642%, N: 0.0054%, Ti: 0.0194%, and the remainder of Fe and unavoidable impurities.
[0084] Example 4
[0085] The preparation method of compressor steel is similar to that of Example 1, except that the chemical composition of the steel is different, specifically as follows: C: 0.0356%, Si: 0.0422%, Mn: 0.298%, P: 0.0165%, S: 0.0048%, Al: 0.0366%, N: 0.0056%, Ti: 0.2264%, and the remainder of Fe and unavoidable impurities.
[0086] Example 5
[0087] The preparation method of compressor steel is similar to that of Example 1, except that the chemical composition of the steel is different, specifically as follows: C: 0.0524%, Si: 0.0407%, Mn: 0.1933%, P: 0.0159%, S: 0.0043%, Al: 0.0557%, N: 0.0061%, Ti: 0.0175%, and the remainder of Fe and unavoidable impurities.
[0088] Comparative Example 1
[0089] A compressor steel is prepared by the following method:
[0090] S10, using a 210t converter for smelting, adding 150 tons of molten iron and 52 tons of scrap steel into the converter, with the converter scrap steel accounting for 25.74%, and obtaining crude molten steel after converter smelting;
[0091] S20, the crude molten steel is transferred to the ladle refining LF furnace for refining. 16 tons of preheated scrap steel is added in the early stage of refining. The preheating temperature of the scrap steel is 655°C. The total scrap steel accounts for 31.19% in the smelting process;
[0092] S30, no soft blowing treatment is performed before calcium treatment of the molten steel in the late refining stage, and soft blowing operation is performed after calcium treatment of the molten steel in the late refining stage, the soft blowing argon flow rate is 234±20NL / min, and the soft blowing time is 8min; the composition of the refined molten steel obtained is C: 0.0577%, Si: 0.0414%, Mn: 0.2023%, P: 0.0172%, S: 0.0048%, Al: 0.0344%, N: 0.0062%, Ti: 0.0019%, and the balance of Fe and unavoidable impurities;
[0093] S40, continuously casting the refined molten steel to obtain a continuously cast billet with a thickness of 230 mm, and sequentially hot rolling, cooling and curling the continuously cast billet to obtain a hot-rolled coil; wherein the hot rolling includes rough rolling and finish rolling, the rough rolling temperature is 1080°C, the finish rolling temperature is 890°C, and the coiling temperature is 630°C.
[0094] Test Section
[0095] The performance test results of the compressor steel prepared in Examples 1-5 and Comparative Example 1 are shown in Table 1.
[0096] Table 1
[0097]
[0098] Figure 1 The welding effect diagram of the steel material in Example 1 is shown. Figure 2 and Figure 3 A schematic diagram of two welding effects of the steel in comparative example 1 is shown. It can be seen that the welding effect of the steel in Example 1 is good, and no problems such as undercut and pores occur after welding. However, the steel in comparative example 1 has obvious pores and undercuts after welding. The welding difference is obvious, which shows that the welding performance of the compressor steel provided in the embodiment of the present application can be effectively improved by adjusting the chemical composition of the steel.
[0099] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. A steel for a compressor, characterized in that: The chemical composition includes the following weight percentages: C: 0.035%-0.065%, Si: 0-0.05%, Mn: 0.18%-0.3%, P: 0-0.02%, S: 0-0.01%, Al: 0.035%-0.065%, N: 0-0.007%, Ti: 0.01%-0.03%, and the balance is Fe and unavoidable impurities.
2. The compressor steel according to claim 1, characterized in that: The compressor steel includes the following chemical composition in weight percentage: C: 0.04%-0.06%, Si≤0.05%, Mn: 0.18%-0.25%, P≤0.02%, S≤0.006%, Al: 0.045%-0.065%, N≤0.006%, Ti: 0.015%-0.03%, and the rest is Fe and unavoidable impurities.
3. The compressor steel according to claim 1 or 2, characterized in that: In the chemical composition of the compressor steel, the weight content of the Ti element m(Ti) and the weight content of the N element m(N) satisfy: m(Ti)≥3.42*m(N).
4. The compressor steel according to claim 1, characterized in that: The compressor steel meets at least one of the following conditions: (1) The yield strength of the compressor steel is 210MPa-290MPa; (2) The tensile strength of the compressor steel is 320MPa-400MPa; (3) The elongation A50 of the compressor steel is ≥38%; (4) The average hardness HRB of the compressor steel is 54-64.
5. A method for preparing compressor steel according to any one of claims 1 to 4, characterized in that: The steps include: The molten iron and the scrap steel are taken for converter smelting to obtain crude molten steel; Refining the crude molten steel to obtain refined molten steel, wherein the refined molten steel comprises the following chemical composition in weight percentage: C: 0.035%-0.065%, Si: 0-0.05%, Mn: 0.18%-0.3%, P: 0-0.02%, S: 0-0.01%, Al: 0.035%-0.065%, N: 0-0.007%, Ti: 0.01%-0.03%, and the balance is Fe and unavoidable impurities; Continuously casting the refined molten steel to obtain a continuously cast billet; The continuously cast billet is hot rolled, cooled, and coiled to obtain a hot rolled steel coil.
6. The preparation method according to claim 5, characterized in that: Based on the total mass of the molten iron and the scrap steel entering the furnace, the weight percentage of the scrap steel entering the furnace is 23%-30%.
7. The preparation method according to claim 5, characterized in that: The refining of the crude molten steel to obtain refined molten steel comprises: adding preheated scrap steel to the crude molten steel to perform refining to obtain refined molten steel; wherein, The preheating temperature of the preheated scrap steel is 550°C-850°C; Based on the total mass of the refined molten steel, the weight percentage of the preheated scrap steel is 3%-10%.
8. The preparation method according to claim 5, characterized in that: The refining includes calcium treatment, and soft blowing treatment is performed between the calcium treatments. The soft blowing argon gas flow rate is 200NL / min-500NL / min, and the soft blowing time is 3min-5min.
9. The preparation method according to claim 8, characterized in that: After the calcium treatment, a soft blowing treatment is also included, the soft blowing argon gas flow rate is 200NL / min-400NL / min, and the soft blowing time is 6min-10min.
10. The preparation method according to claim 8, characterized in that: The thickness of the continuous casting billet is 230 mm-240 mm; and / or The hot rolling includes rough rolling and finish rolling, the rough rolling temperature is 1060°C-1100°C, and the finish rolling temperature is 870°C-930°C; and / or The curling temperature is 610°C-660°C.