CN111534662A - DHRE round steel production process - Google Patents
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- CN111534662A CN111534662A CN202010533782.0A CN202010533782A CN111534662A CN 111534662 A CN111534662 A CN 111534662A CN 202010533782 A CN202010533782 A CN 202010533782A CN 111534662 A CN111534662 A CN 111534662A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/5264—Manufacture of alloyed steels including ferro-alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
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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
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a DHRE round steel production process, which comprises the following steps: step one, smelting in an electric furnace; secondly, manufacturing oxidizing slag; step three, slagging off the molten steel; step four, LF refining; step five, vacuum degassing; step six, molten steel die casting; step seven, electroslag remelting; step eight, forging and cogging; step nine, annealing treatment; step ten, peeling by using a grinding wheel; step eleven, checking and warehousing; by improving the Mo content, controlling the Mo content to be 2.8-3.1%, the method is favorable for improving the hardenability and the heat strength, keeping enough strength and creep resistance at high temperature, greatly improving the quality of round steel, and by reducing the Si content, controlling the Si content to be 0.25-0.4%, the method is favorable for enhancing the plasticity and toughness of steel, improving the transformation temperature from plasticity to brittleness, and greatly improving the quality of steel.
Description
Technical Field
The invention relates to the technical field of round steel production, in particular to a DHRE round steel production process.
Background
The round steel is a solid long steel material having a circular cross section. The specification is expressed in terms of diameter in millimeters, and for example, 50mm means a round bar with a diameter of 50 mm.
Most of the round steel is alloy steel, the plasticity is strong, the application range is wide, the round steel is applied to the industries of construction, mechanical manufacturing and dies, the hardenability and the heat strength of the general round steel are poor, deformation and cracking are easy to occur when quenching is needed in the later processing process, the deformation resistance is poor in the high-temperature process, creep deformation is easy to occur, and the quality of steel is reduced; the plasticity and the toughness of the common round steel are poor, the temperature of plastic deformation and ductile deformation is low, and the plastic deformation is easy to occur; the general round steel has low purity, the steel contains more impurities, the steel is easy to break in the using process, and the difficulty is increased for subsequent processing.
Disclosure of Invention
The invention aims to provide a DHRE round steel production process to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: a DHRE round steel production process comprises the following steps: step one, smelting in an electric furnace; secondly, manufacturing oxidizing slag; step three, slagging off the molten steel; step four, LF refining; step five, vacuum degassing; step six, molten steel die casting; step seven, electroslag remelting; step eight, forging and cogging; step nine, annealing treatment; step ten, peeling by using a grinding wheel; step eleven, checking and warehousing;
in the first step, lime accounting for 1.5 percent of the total weight of steel materials is paved at the bottom of the three electric arc furnaces, then cold scrap steel is put into the three electric arc furnaces, and the cold scrap steel is melted into molten steel by utilizing high temperature generated by electric arcs between the graphite electrodes and the cold scrap steel;
in the second step, oxygen is blown into the molten steel melted in the first step and lime is added in batches, so that the oxygen and the lime react with sulfur and phosphorus in the molten steel to generate substances such as phosphorus pentoxide, carbon monoxide, carbon dioxide, calcium sulfide, sulfur dioxide and the like, and the sulfur and the phosphorus in the molten steel are removed;
in the third step, scum generated in the second step is removed by a slag removing machine until the scum on the surface of the molten steel is completely removed;
in the fourth step, the molten steel from which the scum is removed in the third step is injected into an LF ladle refining furnace, and then mixed gas of argon and oxygen is blown into the LF ladle refining furnace from the bottom of the LF ladle refining furnace, so that the content of carbon in the molten steel is quickly reduced;
in the fifth step, adding a proper amount of alloy into the molten steel after the mixed gas is blown into the molten steel in the fourth step, sampling and detecting the content of each metal element in the molten steel, vacuumizing the interior of the LF ladle refining furnace by using a vacuum pump after the molten steel is qualified, and then adding aluminum for precipitation and deoxidation;
in the sixth step, the degassed molten steel in the fifth step is poured into a mould to be cast into a consumable electrode;
in the seventh step, the consumable electrode cast in the sixth step is placed into an electroslag furnace, the temperature of the electroslag furnace is 1500-;
in the eighth step, the steel ingot solidified in the seventh step is placed into a heating furnace, and after heating, the steel ingot is repeatedly forged for many times by using three-ton and five-ton electro-hydraulic hammers respectively until oxides on the surface of the steel ingot fall off and the size of the steel ingot is uniform;
in the ninth step, the steel ingot forged in the eighth step is loaded into an isothermal spheroidizing annealing furnace for isothermal spheroidizing annealing and grain refinement;
in the tenth step, the steel ingot annealed in the ninth step is polished by a grinding wheel machine until the surface of the round steel ingot is smooth;
and in the eleventh step, the round steel ingot polished in the tenth step is detected by using a pulse type ultrasonic detector and stored in a warehouse after the detection is finished.
According to the technical scheme, in the step one, the scrap steel is surface rust-less, has no mixture, clear components, proper bulk degree and steel, and the heating temperature of the three electric arc furnaces is 1500-.
According to the technical scheme, in the second step, lime accounting for 1% of the total weight of the scrap steel is added in batches until the total weight of the lime accounts for 4-5% of the total weight of the scrap steel, and the contents of sulfur and phosphorus in the molten steel after reaction are both 0-0.025%.
According to the technical scheme, in the fourth step, the temperature of the LF ladle refining furnace is 1500-2000 ℃, and oxygen reacts with carbon in molten steel to form CO2And CO until the carbon content in the molten steel is 0.39-0.4%.
According to the technical scheme, in the fifth step, after the alloy is added and dissolved, the content of Cr in the molten steel is between 4.8 and 5.2 percent, the content of V is between 0.6 and 0.7 percent, the content of Mn is between 0.3 and 0.5 percent, the content of Si is between 0.25 and 0.4 percent, the content of Ni is between 0 and 0.25 percent, the content of Mo is between 2.8 and 3.1 percent, the content of Cu is between 0 and 0.2 percent, and the vacuum treatment time is between 15 and 20 minutes.
According to the technical scheme, in the eighth step, the heating furnace is a molybdenum wire heating furnace with hydrogen protection, and the heating temperature is 1000-1300 ℃.
According to the above technical scheme, in the ninth step, the isothermal spheroidizing annealing is to heat the steel material to AC1Keeping the temperature for a proper time at the temperature of between 20 and 30 ℃, and then reducing the temperature in the furnace to AR1And then carrying out isothermal treatment, wherein the isothermal time is 1.5 times of the heat preservation time, cooling to 500 ℃ in the furnace after isothermal treatment, discharging from the furnace for air cooling, and carrying out grain refinement treatment by using a phase change recrystallization method.
Compared with the prior art, the invention has the following beneficial effects:
1. by increasing the Mo content, the control is 2.8-3.1%, which is beneficial to improving the hardenability and the heat strength, and the steel keeps enough strength and creep resistance at high temperature, thereby greatly improving the quality of round steel.
2. By reducing the Si content, the control is between 0.25 and 0.4 percent, which is beneficial to enhancing the plasticity and the toughness of steel, improving the transformation temperature from the plasticity to the brittleness, balancing the transverse performance and the longitudinal performance of steel and greatly improving the quality of the steel.
3. Through the design of smelting of an electric arc furnace, LF ladle refining, electroslag remelting and refined crystal grain treatment, the purity of the round steel is favorably improved, the content of impurities in the round steel is greatly reduced, the stress is favorably eliminated, and the steel quality is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: a DHRE round steel production process comprises the following steps: step one, smelting in an electric furnace; secondly, manufacturing oxidizing slag; step three, slagging off the molten steel; step four, LF refining; step five, vacuum degassing; step six, molten steel die casting; step seven, electroslag remelting; step eight, forging and cogging; step nine, annealing treatment; step ten, peeling by using a grinding wheel; step eleven, checking and warehousing;
in the first step, lime accounting for 1.5 percent of the total weight of the steel materials is paved at the bottom of the three electric arc furnaces, then the cold scrap steel is put into the three electric arc furnaces, the electric arc between the graphite electrode and the cold scrap steel is utilized to generate high temperature so that the cold scrap steel is melted into molten steel, the scrap steel is surface rust-less, no mixture exists, the components are clear, the bulk is proper and is made of steel, and the heating temperature of the three electric arc furnaces is 1500-plus-1650 ℃;
in the second step, oxygen is blown into the molten steel melted in the first step, lime accounting for 1 percent of the total weight of the scrap steel is added in batches until the total weight of the lime accounts for 4 to 5 percent of the total weight of the scrap steel, the lime enables the oxygen and the lime to react with sulfur and phosphorus in the molten steel to generate substances such as phosphorus pentoxide, carbon monoxide, carbon dioxide, calcium sulfide, sulfur dioxide and the like, the sulfur and the phosphorus in the molten steel are removed, and the content of the sulfur and the phosphorus in the molten steel after the reaction is 0 to 0.025 percent;
in the third step, scum generated in the second step is removed by a slag removing machine until the scum on the surface of the molten steel is completely removed;
in the fourth step, the molten steel without scum in the third step is injected into an LF ladle refining furnace, the temperature of the LF ladle refining furnace is 1500-2000 ℃, then mixed gas of argon and oxygen is blown into the LF ladle refining furnace from the bottom of the LF ladle refining furnace, and the oxygen reacts with carbon in the molten steel to form CO2And CO, quickly reducing the carbon content in the molten steel until the carbon content in the molten steel is 0.39-0.4%;
in the fifth step, adding a proper amount of alloy into the molten steel after the mixed gas is blown into the fourth step, sampling and detecting the content of each metal element in the molten steel, wherein after the alloy is added and dissolved, the content of Cr in the molten steel is between 4.8 and 5.2 percent, the content of V is between 0.6 and 0.7 percent, the content of Mn is between 0.3 and 0.5 percent, the content of Si is between 0.25 and 0.4 percent, the content of Ni is between 0 and 0.25 percent, the content of Mo is between 2.8 and 3.1 percent, and the content of Cu is between 0 and 0.2 percent, vacuumizing the interior of an LF ladle refining furnace by using a vacuum pump after the molten steel is qualified, performing vacuum treatment for 15 to 20 minutes, and then adding aluminum for precipitation and deoxidation;
in the sixth step, the degassed molten steel in the fifth step is poured into a mould to be cast into a consumable electrode;
in the seventh step, the consumable electrode cast in the sixth step is placed into an electroslag furnace in the electroslag furnace at the temperature of 1500-;
in the eighth step, the steel ingot formed by solidification in the seventh step is placed into a heating furnace, the heating furnace is a molybdenum wire heating furnace with hydrogen protection, the heating temperature is 1000-1300 ℃, and after heating, three-ton and five-ton electro-hydraulic hammers are respectively used for repeatedly forging the steel ingot for many times until oxides on the surface of the steel ingot fall off and the size of the steel ingot is uniform;
in the ninth step, the steel ingot forged in the eighth step is loaded into an isothermal spheroidizing annealing furnace for isothermal spheroidizing annealing and grain refinement, wherein the isothermal spheroidizing annealing is to heat the steel material to AC1Keeping the temperature for a proper time at the temperature of between 20 and 30 ℃, and then reducing the temperature in the furnace to AR1Then isothermal treatment is carried out, the isothermal time is 1.5 times of the heat preservation time, after isothermal treatment, the isothermal treatment is carried out after the furnace is cooled to 500 ℃, the furnace is taken out for air cooling, and the phase change recrystallization method is utilized for grain refining treatment;
in the tenth step, the steel ingot annealed in the ninth step is polished by a grinding wheel machine until the surface of the round steel ingot is smooth;
and in the eleventh step, the round steel ingot polished in the tenth step is detected by using a pulse type ultrasonic detector and stored in a warehouse after the detection is finished.
Based on the above, the invention has the advantages that by improving the content of Mo in the steel, the probability of cracking and deformation during the later quenching is reduced, the deformation resistance of the steel at high temperature is improved, the quality of the steel is greatly improved, the content of Si in the steel is reduced, the plastic deformation resistance of the steel is favorably improved, the temperature for changing plasticity into brittleness is improved, the quality of the steel is improved, the content of impurities in the steel is effectively reduced by utilizing the smelting of an electric arc furnace, the refining of an LF ladle, the remelting of electroslag and the treatment of refined crystal grains, the purity of the steel is improved, the internal stress of the steel is reduced, and the later processing is favorably realized.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A DHRE round steel production process comprises the following steps: step one, smelting in an electric furnace; secondly, manufacturing oxidizing slag; step three, slagging off the molten steel; step four, LF refining; step five, vacuum degassing; step six, molten steel die casting; step seven, electroslag remelting; step eight, forging and cogging; step nine, annealing treatment; step ten, peeling by using a grinding wheel; step eleven, checking and warehousing; the method is characterized in that:
in the first step, lime accounting for 1.5 percent of the total weight of steel materials is paved at the bottom of the three electric arc furnaces, then cold scrap steel is put into the three electric arc furnaces, and the cold scrap steel is melted into molten steel by utilizing high temperature generated by electric arcs between the graphite electrodes and the cold scrap steel;
in the second step, oxygen is blown into the molten steel melted in the first step and lime is added in batches, so that the oxygen and the lime react with sulfur and phosphorus in the molten steel to generate substances such as phosphorus pentoxide, carbon monoxide, carbon dioxide, calcium sulfide, sulfur dioxide and the like, and the sulfur and the phosphorus in the molten steel are removed;
in the third step, scum generated in the second step is removed by a slag removing machine until the scum on the surface of the molten steel is completely removed;
in the fourth step, the molten steel from which the scum is removed in the third step is injected into an LF ladle refining furnace, and then mixed gas of argon and oxygen is blown into the LF ladle refining furnace from the bottom of the LF ladle refining furnace, so that the content of carbon in the molten steel is quickly reduced;
in the fifth step, adding a proper amount of alloy into the molten steel after the mixed gas is blown into the molten steel in the fourth step, sampling and detecting the content of each metal element in the molten steel, vacuumizing the interior of the LF ladle refining furnace by using a vacuum pump after the molten steel is qualified, and then adding aluminum for precipitation and deoxidation;
in the sixth step, the degassed molten steel in the fifth step is poured into a mould to be cast into a consumable electrode;
in the seventh step, the consumable electrode cast in the sixth step is placed into an electroslag furnace, the temperature of the electroslag furnace is 1500-;
in the eighth step, the steel ingot solidified in the seventh step is placed into a heating furnace, and after heating, the steel ingot is repeatedly forged for many times by using three-ton and five-ton electro-hydraulic hammers respectively until oxides on the surface of the steel ingot fall off and the size of the steel ingot is uniform;
in the ninth step, the steel ingot forged in the eighth step is loaded into an isothermal spheroidizing annealing furnace for isothermal spheroidizing annealing and grain refinement;
in the tenth step, the steel ingot annealed in the ninth step is polished by a grinding wheel machine until the surface of the round steel ingot is smooth;
and in the eleventh step, the round steel ingot polished in the tenth step is detected by using a pulse type ultrasonic detector and stored in a warehouse after the detection is finished.
2. The DHRE round steel production process as claimed in claim 1, wherein the DHRE round steel production process comprises the following steps: in the first step, the scrap steel is surface rust-less, has no mixed material, has definite components, proper bulk and steel, and the heating temperature of the three electric arc furnaces is 1500-.
3. The DHRE round steel production process as claimed in claim 1, wherein the DHRE round steel production process comprises the following steps: in the second step, lime accounting for 1 percent of the total weight of the scrap steel is added in batches until the total weight of the lime accounts for 4 to 5 percent of the total weight of the scrap steel, and the contents of sulfur and phosphorus in the molten steel after reaction are all 0 to 0.025 percent.
4. The DHRE round steel production process as claimed in claim 1, wherein the DHRE round steel production process comprises the following steps: in the fourth step, the temperature of the LF ladle refining furnace is 1500-2000 ℃, and oxygen reacts with carbon in molten steel to form CO2And CO until the carbon content in the molten steel is 0.39-0.4%.
5. The DHRE round steel production process as claimed in claim 1, wherein the DHRE round steel production process comprises the following steps: in the fifth step, after the alloy is added and dissolved, the content of Cr in the molten steel is between 4.8 and 5.2 percent, the content of V is between 0.6 and 0.7 percent, the content of Mn is between 0.3 and 0.5 percent, the content of Si is between 0.25 and 0.4 percent, the content of Ni is between 0 and 0.25 percent, the content of Mo is between 2.8 and 3.1 percent, the content of Cu is between 0 and 0.2 percent, and the vacuum treatment time is between 15 and 20 minutes.
6. The DHRE round steel production process as claimed in claim 1, wherein the DHRE round steel production process comprises the following steps: in the eighth step, the heating furnace is a molybdenum wire heating furnace with hydrogen protection, and the heating temperature is 1000-1300 ℃.
7. The DHRE round steel production process as claimed in claim 1, wherein the DHRE round steel production process comprises the following steps: in the ninth step, the isothermal spheroidizing annealing is to heat the steel material to AC1Keeping the temperature for a proper time at the temperature of between 20 and 30 ℃, and then reducing the temperature in the furnace to AR1And then carrying out isothermal treatment, wherein the isothermal time is 1.5 times of the heat preservation time, cooling to 500 ℃ in the furnace after isothermal treatment, discharging from the furnace for air cooling, and carrying out grain refinement treatment by using a phase change recrystallization method.
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