CN113943888A - 1.5-1.8 mm340 MPa-grade cold-rolled low-alloy high-strength steel for automobiles and production method thereof - Google Patents
1.5-1.8 mm340 MPa-grade cold-rolled low-alloy high-strength steel for automobiles and production 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold 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
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
Abstract
The invention discloses 1.5-1.8 mm340 MPa-grade cold-rolled low-alloy high-strength steel for automobiles, which is characterized by comprising the following chemical components in percentage by mass: c: 0.06-0.08%, Si: 0.13 to 0.18%, Mn: 0.45-0.55%, P: less than or equal to 0.018%, S: less than or equal to 0.005 percent, Alt: 0.020 to 0.050%, Ti: 0.015 to 0.025%, Nb: 0.025-0.035%, Ca: 0.0008 to 0.0020 percent, and the balance of Fe and inevitable impurities. Its preparing process is also disclosed. The cold-rolled low-alloy high-strength steel has the characteristics of low yield ratio, high initial work hardening rate, good strength and ductility matching and the like, meets the requirement of light weight material selection of automobiles, and meets the requirement of EN10268-2013 on cold-forming high-yield-strength cold-rolled steel strip in mechanical property and technological property.
Description
Technical Field
The invention relates to the technical field of metallurgical plate production, in particular to 1.5-1.8 mm340 MPa-grade cold-rolled low-alloy high-strength steel for automobiles and a production method thereof.
Background
In recent years, environmental protection requirements for automobiles in various countries are becoming more and more strict, and automobile manufacturers propose to reduce exhaust emissions by reducing the weight of automobile bodies in order to meet the environmental protection requirements. In order to comply with the current development, steel enterprises increase the research investment on the light weight of the automobile steel, wherein the development of the low-alloy high-strength steel not only meets the requirement of weight reduction of the automobile steel, but also considers the requirement of automobile safety.
The low-alloy high-strength steel is prepared by adding alloy elements such as niobium, titanium and the like on the basis of the components of low-carbon steel and utilizing the solid solution, segregation and precipitation effects of the alloy elements in the steel so as to produce solid solution strengthening, fine grain strengthening and precipitation strengthening. The microstructure of this steel sheet at room temperature is composed of ferrite and pearlite. The steel can be used for cold forming of automobile structural parts, such as front longitudinal beams of cars, is automobile steel with high strength, high plasticity and strain rate strengthening effect, and has good collision energy absorption potential.
The HC340LA steel has good welding performance and enough strength and stamping performance, so the steel is widely applied to the fields of automobile A-pillar upper reinforcements, inner B-pillars, rocker extensions, left and right longitudinal beam outer plates, chassis seat parts and the like, and has wide development prospect.
Disclosure of Invention
The invention aims to solve the technical problem of providing 340 MPa-grade cold-rolled low-alloy high-strength steel for automobiles and a production method thereof, the prepared cold-rolled low-alloy high-strength steel has the characteristics of low yield ratio, high initial work hardening rate, good strength and ductility matching and the like, the requirements of automobile light weight material selection are met, and the mechanical property and the technological property meet the requirements of EN10268-2013 cold-formed high-yield-strength cold-rolled steel strips.
In order to solve the technical problems, the invention adopts the following technical scheme:
1.5-1.8 mm340 MPa-grade cold-rolled low-alloy high-strength steel for automobiles comprises the following chemical components in percentage by mass: c: 0.06-0.08%, Si: 0.13 to 0.18%, Mn: 0.45-0.55%, P: less than or equal to 0.018%, S: less than or equal to 0.005 percent, Alt: 0.020 to 0.050%, Ti: 0.015 to 0.025%, Nb: 0.025-0.035%, Ca: 0.0008 to 0.0020 percent, and the balance of Fe and inevitable impurities.
Further, the chemical components comprise the following components in percentage by mass: c: 0.064%, Si: 0.159%, Mn: 0.50%, P: 0.0128%, S: 0.0023%, Alt: 0.0278%, Ti: 0.020%, Nb: 0.0289%, Ca: 0.002%, and the balance of Fe and inevitable impurities.
Further, the chemical components comprise the following components in percentage by mass: c: 0.065%, Si: 0.163%, Mn: 0.47%, P: 0.0127%, S: 0.0018%, Alt: 0.0292%, Ti: 0.022%, Nb: 0.0292%, Ca: 0.002%, and the balance of Fe and inevitable impurities.
Further, the chemical components comprise the following components in percentage by mass: c: 0.065%, Si: 0.165%, Mn: 0.46%, P: 0.0111%, S: 0.0014%, Alt: 0.0289%, Ti: 0.019%, Nb: 0.0279%, Ca: 0.002%, and the balance of Fe and inevitable impurities.
A production method of 1.5-1.8 mm340 MPa-grade cold-rolled low-alloy high-strength steel for automobiles comprises the following steps:
(1) the smelting-continuous casting production process flow comprises the following steps: pretreatment of molten iron, converter, LF refining and casting machine. The molten steel for the casting machine comprises the following components: 0.06-0.08%, Si: 0.13 to 0.18%, Mn: 0.45-0.55%, P: less than or equal to 0.018%, S: less than or equal to 0.005 percent, Alt: 0.020 to 0.050%, Ti: 0.015 to 0.025, Nb: 0.025-0.035, Ca: 0.0008 to 0.0020 percent
(2) The hot rolling production process flow comprises the following steps: heating a casting blank, rough rolling, finish rolling and coiling. The casting blank discharging temperature is 1220-1240 ℃, the rough rolling is performed by adopting a 3+3 model 2-frame rolling mill, the finish rolling is performed by adopting a 7-frame continuous variable crown (cvc) rolling mill, and the thickness of the intermediate blank is 40-45 mm. The finish rolling temperature of the finish rolling is 870 +/-20 ℃, and the thickness of the hot rolled steel strip is 4.5 mm. Laminar flow cooling equipment is adopted for cooling, a front dispersion cooling mode is adopted, and the coiling temperature is 580 +/-20 ℃;
(3) acid washing cold rolling process flow: pickling the hot-rolled strip steel by using a hydrochloric acid tank of an i-BOX technology, removing surface iron scales, cold-rolling by using a 5-stand cold rolling mill until the cold-rolling reduction rate is 67 percent and the target thickness is 1.5 mm;
(4) the continuous annealing process flow comprises the following steps: uncoiling the cold-hard coil steel strip, heating to 785 +/-5 ℃, soaking for 130-160S, cooling to 580 +/-20 ℃ at the speed of 3-5 ℃/S, then cooling to 380-450 ℃ at the cooling speed of 10-15 ℃/S, and setting the flat elongation at 1.7%.
Compared with the prior art, the invention has the beneficial technical effects that:
the low-alloy high-strength steel has a metallographic microstructure of ferrite and a grain size of 11.5-12. The 340 MPa-grade cold-rolled low-alloy high-strength steel for automobiles, which is produced by the method provided by the invention, is subjected to stamping use tests of a plurality of automobile factories, and all indexes of surface quality and performance reach the relevant technical standard requirements of the automobile factories, so that the use requirements of the relevant automobile factories are met. The mechanical property and the process property meet the requirements of EN10268-2013 cold-forming high-yield-strength cold-rolled steel strip. Meanwhile, the alloy of the invention has low cost and simple preparation method, and is suitable for industrial production.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a microstructure diagram of example 1.
Detailed Description
The present invention is described in more detail below by way of specific examples. The examples are merely illustrative of the best mode of carrying out the invention and do not limit the scope of the invention in any way.
Example 1
The method comprises the following steps of carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of the converter smelting, adding scrap steel into the converter, and carrying out tapping at 1635 ℃ by the converter. And then, carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-place temperature is more than or equal to 1560 ℃, carrying out temperature measurement and component fine adjustment on the LF external refining, and the chemical components of the ladle casting machine for the LF external refining are shown in Table 1. The superheat degree of the slab continuous casting is 20 ℃, and then slab cleaning, slow cooling and quality inspection of the continuous casting slab are carried out. The heating temperature of the plate blank is 1225 ℃, the heating time is 232min, and the heated plate blank is subjected to high-pressure water dephosphorization. The width is fixed by a width fixing press, 2 frames are adopted for rough rolling, and 7 frames are adopted for CVC finish rolling. The finish rolling temperature is 880 ℃, and the thickness of the finished product is 4.5 mm. And adopting front dispersion cooling for laminar cooling, and reducing the temperature of the steel strip to 582 ℃ for coiling. The hot-rolled strip steel is pickled by a hydrochloric acid tank, the acid tank adopts an i-BOX technology newly developed by MH, the energy and labor force are saved, after the surface iron scale of the hot-rolled strip steel is removed, the hot-rolled strip steel is cold-rolled by a UCM rolling mill with 5 frames, the cold-rolling reduction rate is 66.7 percent, and the target thickness is 1.5 mm. The cold-hard coil continuous annealing is carried out in a continuous vertical annealing furnace with HGJC function, the running speed of the steel strip is 120m/min, the soaking temperature is 785 ℃, the soaking time is 140S, the rapid cooling starting temperature is 646 ℃, the rapid cooling speed is 11 ℃/S, and the leveling elongation is 1.7%. And finally, detecting the product performance.
Example 2
The method comprises the following steps of carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of the converter smelting, adding scrap steel into the converter, and carrying out tapping at 1632 ℃ by the converter. And then, carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-place temperature is more than or equal to 1560 ℃, carrying out temperature measurement and component fine adjustment on the LF external refining, and the chemical components of the ladle casting machine for the LF external refining are shown in Table 1. The superheat degree of the continuous casting of the slab is 26 ℃, and then slab cleaning, slow cooling and continuous casting slab quality inspection are carried out. The heating temperature of the plate blank is 1228 ℃, the heating time is 236min, and the heated plate blank is subjected to high-pressure water dephosphorization. The width is fixed by a width fixing press, 2 frames are adopted for rough rolling, and 7 frames are adopted for CVC finish rolling. The finish rolling temperature is 883 ℃, and the thickness of the finished product is 4.5 mm. And the laminar cooling adopts front dispersed cooling, and the temperature of the steel strip is reduced to 586 ℃ for coiling. The hot-rolled strip steel is pickled by a hydrochloric acid tank, the acid tank adopts an i-BOX technology newly developed by MH, the energy and labor force are saved, after the surface iron scale of the hot-rolled strip steel is removed, the hot-rolled strip steel is cold-rolled by a UCM rolling mill with 5 frames, the cold-rolling reduction rate is 66.7 percent, and the target thickness is 2.0 mm. The cold-hard coil continuous annealing is carried out in a continuous vertical annealing furnace with HGJC function, the running speed of the steel strip is 115m/min, the soaking temperature is 780 ℃, the soaking time is 147S, the quick cooling starting temperature is 652 ℃, the quick cooling speed is 13 ℃/S, and the leveling elongation is 1.7%. And finally, detecting the product performance.
Example 3
Carrying out desulfurization pretreatment on molten iron, carrying out decarburization and dephosphorization on the molten iron by adopting a top-bottom combined blown converter to obtain molten steel, blowing argon in the whole process of the converter smelting, adding scrap steel into the converter, and tapping the steel at the converter at the temperature of 1640 ℃. And then, carrying out LF external refining on the molten steel smelted by the converter, wherein the refining in-place temperature is more than or equal to 1560 ℃, carrying out temperature measurement and component fine adjustment on the LF external refining, and the chemical components of the ladle casting machine for the LF external refining are shown in Table 2. The superheat degree of the continuous casting of the slab is 23 ℃, and then slab cleaning, slow cooling and continuous casting slab quality inspection are carried out. The heating temperature of the plate blank is 1226 ℃, the heating time is 228min, and the heated plate blank is subjected to high-pressure water dephosphorization. The width is fixed by a width fixing press, 2 frames are adopted for rough rolling, and 7 frames are adopted for CVC finish rolling. The finish rolling temperature is 887 ℃, and the thickness of the finished product is 4.5 mm. And the laminar cooling adopts pre-dispersion cooling, and the temperature of the steel strip is reduced to 580 ℃ for coiling. The hot-rolled strip steel is pickled by a hydrochloric acid tank, the acid tank adopts an i-BOX technology newly developed by MH, the energy and labor force are saved, after the surface iron scale of the hot-rolled strip steel is removed, the hot-rolled strip steel is cold-rolled by a UCM rolling mill with 5 frames, the cold-rolling reduction rate is 66.7 percent, and the target thickness is 1.5 mm. The cold-hard coil continuous annealing is carried out in a continuous vertical annealing furnace with HGJC function, the running speed of the steel strip is 130m/min, the soaking temperature is 786 ℃, the soaking time is 130S, the quick cooling starting temperature is 660 ℃, the quick cooling speed is 15 ℃/S, and the leveling elongation is 1.7%. And finally, detecting the product performance.
TABLE 1 chemical composition (wt%) of inventive examples 1 to 3
Mechanical property test is carried out on the steel coils of the embodiments 1-3 of the invention, and the test results are shown in table 2.
TABLE 2 mechanical properties of steel coils according to the invention in examples 1 to 3
As can be seen from the data in Table 2, the mechanical properties and the technological properties of the cold-rolled low-alloy high-strength steel for the 340 MPa-grade automobile produced by the method provided by the invention meet the requirements of EN 10268-2013.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (5)
1. The 1.5-1.8 mm340 MPa-grade cold-rolled low-alloy high-strength steel for the automobile is characterized by comprising the following chemical components in percentage by mass: c: 0.06-0.08%, Si: 0.13 to 0.18%, Mn: 0.45-0.55%, P: less than or equal to 0.018%, S: less than or equal to 0.005 percent, Alt: 0.020 to 0.050%, Ti: 0.015 to 0.025%, Nb: 0.025-0.035%, Ca: 0.0008 to 0.0020 percent, and the balance of Fe and inevitable impurities.
2. The 1.5-1.8 mm340MPa grade cold-rolled low-alloy high-strength steel for the automobile according to claim 1, which is characterized by comprising the following chemical components in percentage by mass: c: 0.064%, Si: 0.159%, Mn: 0.50%, P: 0.0128%, S: 0.0023%, Alt: 0.0278%, Ti: 0.020%, Nb: 0.0289%, Ca: 0.002%, and the balance of Fe and inevitable impurities.
3. The 1.5-1.8 mm340MPa grade cold-rolled low-alloy high-strength steel for the automobile according to claim 1, which is characterized by comprising the following chemical components in percentage by mass: c: 0.065%, Si: 0.163%, Mn: 0.47%, P: 0.0127%, S: 0.0018%, Alt: 0.0292%, Ti: 0.022%, Nb: 0.0292%, Ca: 0.002%, and the balance of Fe and inevitable impurities.
4. The 1.5-1.8 mm340MPa grade cold-rolled low-alloy high-strength steel for the automobile according to claim 1, which is characterized by comprising the following chemical components in percentage by mass: c: 0.065%, Si: 0.165%, Mn: 0.46%, P: 0.0111%, S: 0.0014%, Alt: 0.0289%, Ti: 0.019%, Nb: 0.0279%, Ca: 0.002%, and the balance of Fe and inevitable impurities.
5. The production method of 1.5-1.8 mm340MPa grade cold-rolled low-alloy high-strength steel for the automobile according to any one of claims 1-4, characterized by comprising the following steps:
(1) the smelting-continuous casting production process flow comprises the following steps: pretreatment of molten iron, converter, LF refining and casting machine. The molten steel for the casting machine comprises the following components: 0.06-0.08%, Si: 0.13 to 0.18%, Mn: 0.45-0.55%, P: less than or equal to 0.018%, S: less than or equal to 0.005 percent, Alt: 0.020 to 0.050%, Ti: 0.015 to 0.025, Nb: 0.025-0.035, Ca: 0.0008 to 0.0020 percent
(2) The hot rolling production process flow comprises the following steps: heating a casting blank, rough rolling, finish rolling and coiling. The casting blank discharging temperature is 1220-1240 ℃, the rough rolling is performed by adopting a 3+3 model 2-frame rolling mill, the finish rolling is performed by adopting a 7-frame continuous variable crown (cvc) rolling mill, and the thickness of the intermediate blank is 40-45 mm. The finish rolling temperature of the finish rolling is 870 +/-20 ℃, and the thickness of the hot rolled steel strip is 4.5 mm. Laminar flow cooling equipment is adopted for cooling, a front dispersion cooling mode is adopted, and the coiling temperature is 580 +/-20 ℃;
(3) acid washing cold rolling process flow: pickling the hot-rolled strip steel by using a hydrochloric acid tank of an i-BOX technology, removing surface iron scales, cold-rolling by using a 5-stand cold rolling mill until the cold-rolling reduction rate is 67 percent and the target thickness is 1.5 mm;
(4) the continuous annealing process flow comprises the following steps: uncoiling the cold-hard coil steel strip, heating to 785 +/-5 ℃, soaking for 130-160S, cooling to 580 +/-20 ℃ at the speed of 3-5 ℃/S, then cooling to 380-450 ℃ at the cooling speed of 10-15 ℃/S, and setting the flat elongation at 1.7%.
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