CN112375973A - High-strength steel structural member for building curtain wall engineering and heat treatment process thereof - Google Patents
High-strength steel structural member for building curtain wall engineering and heat treatment process thereof Download PDFInfo
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Abstract
The invention relates to a high-strength steel structural member for building curtain wall engineering and a heat treatment process thereof, wherein the high-strength steel structural member comprises the following components in percentage by weight: 0.06-0.12% of C, 0.3-0.6% of Si, 0.3-0.6% of V, 0.1-0.4% of Cr, 0.02-0.03% of Al, 0.1-0.4% of Hf, 0.1-0.3% of Mo, 1.2-1.8% of Mn, 0.05-0.1% of Ir, 0.06-0.2% of rare earth elements, less than or equal to 0.005% of S, less than or equal to 0.015% of P, and the balance of Fe and inevitable impurities. The invention solves the problem that the high-strength steel structural member used in the existing building curtain wall engineering has poor toughness although the strength can reach the standard. The invention finally obtains the steel structural member with high strength and high toughness (elongation) for the building curtain wall engineering by optimizing the composition and the heat treatment of the existing steel structural member.
Description
Technical Field
The invention relates to the field of steel structures for buildings, in particular to a high-strength steel structural member for building curtain wall engineering and a heat treatment process thereof.
Background
High-strength steel has been widely used in important engineering fields, such as aircraft landing gear, petroleum transportation pipelines, nuclear power station pressure vessels and other key components, because of its excellent comprehensive mechanical properties such as strength, plasticity, toughness and the like. In recent years, with the development of science and technology, almost all engineering structural materials including building curtain wall engineering have high strength and high toughness in the development direction, but unfortunately, the strength and toughness relationship is always restricted, and the toughness is a key factor limiting the development of the high-strength structural materials.
Disclosure of Invention
Aiming at the problems, the invention provides a high-strength steel structural member for building curtain wall engineering and a heat treatment process thereof, which greatly improve the toughness of the high-strength steel structural member used in the existing building curtain wall engineering.
The technical scheme of the invention is as follows:
the invention aims to provide a high-strength steel structural member for building curtain wall engineering, which comprises the following components in percentage by weight:
0.06-0.12% of C, 0.3-0.6% of Si, 0.3-0.6% of V, 0.1-0.4% of Cr, 0.02-0.03% of Al, 0.1-0.4% of Hf, 0.1-0.3% of Mo, 1.2-1.8% of Mn, 0.05-0.1% of Ir, 0.06-0.2% of rare earth elements, less than or equal to 0.005% of S, less than or equal to 0.015% of P, and the balance of Fe and inevitable impurities.
Preferably, the high-strength steel structural member for the building curtain wall engineering comprises the following components in percentage by weight:
0.08-0.1% of C, 0.4-0.5% of Si, 0.3-0.5% of V, 0.2-0.4% of Cr, 0.02-0.03% of Al, 0.2-0.3% of Hf, 0.2-0.3% of Mo, 1.3-1.5% of Mn, 0.08-0.1% of Ir, 0.1-0.16% of rare earth elements, less than or equal to 0.005% of S, less than or equal to 0.015% of P, rare earth elements and the balance of Fe and inevitable impurities.
Preferably, the rare earth element includes Pr and also includes at least two of Nd, Yb and Sc.
Preferably, the rare earth elements are Pr, Nd and Yb, and the mass ratio of Pr, Nd and Yb is 1: 0.2-0.8: 0.6-1.5.
Preferably, the rare earth elements are Pr, Yb and Sc, and the mass ratio of Pr, Yb and Sc is 1: 1.2-1.7: 2.3-3.5.
Another object of the present invention is to provide a heat treatment process for a high-strength steel structural member for a construction curtain wall engineering, comprising the steps of:
step 1, smelting a steel billet: smelting in a converter according to the following components in percentage by weight: 0.06-0.12% of C, 0.3-0.6% of Si, 0.3-0.6% of V, 0.1-0.4% of Cr, 0.02-0.03% of Al, 0.1-0.4% of Hf, 0.1-0.3% of Mo, 1.2-1.8% of Mn, 0.05-0.1% of Ir, less than or equal to 0.005% of S, less than or equal to 0.015% of P, and the balance of Fe and inevitable impurities; casting a steel plate on a mould, and adding a rare earth element metal wire in the casting process, wherein the weight ratio of the added rare earth element is 0.06-0.2%, so as to obtain a steel plate billet;
step 2, rolling for the first time: air-cooling the steel plate billet to room temperature, polishing the steel plate billet until the surface is smooth, and performing primary rolling at the room temperature to obtain a primary rolled steel plate; wherein the rolling adopts an alternate asynchronous rolling mode, the rolling differential speed ratio is 1: 1.2-1.6, and the total rolling reduction rate is 60-65%;
step 3, rolling for the second time: the first timePlacing the rolled steel plate in a resistance furnace, heating to 400-600 ℃, forging for 0.1-0.2 h, and then performing secondary rolling at the temperature to obtain a secondary rolled steel plate; wherein the deformation amount of the second rolling is 65-90%, and the deformation speed is 10-100 s-1；
Step 4, preheating: under the protection of nitrogen, heating the second rolled steel plate to 800-900 ℃, and preserving heat for 0.3-0.5 h to obtain a preheated steel plate;
step 5, quenching treatment: under the protection of nitrogen, continuously heating the preheated steel plate to 1050-1250 ℃, preserving heat for 0.5-0.8 h, carrying out oil quenching, and cooling to room temperature to obtain a quenched steel plate;
step 6, tempering for the first time: placing the quenched steel plate in a tempering furnace, heating to 600-620 ℃ at the speed of 10 ℃/min, tempering for 2-3 h, and then air-cooling to room temperature to obtain a first tempered steel plate;
and 7, tempering for the second time: and directly placing the first tempered steel plate in a tempering furnace at 560-580 ℃, tempering for 1-2 hours, and then air-cooling to room temperature to obtain the high-strength steel structural member.
The invention has the beneficial effects that:
the performance of the steel structural member is mainly determined by the structure composition and the performance of the steel structural member, and the heat treatment process is different, the final structure composition phase is different, the composition proportion is different, and the composition phase performance is different, so the composition and the heat treatment of the steel structural member determine the structure composition and the performance of the steel structural member. The invention finally obtains the steel structural member with high strength and high toughness (elongation) for the building curtain wall engineering by optimizing the composition and the heat treatment of the existing steel structural member.
Firstly, the rare earth elements are added into the composition, and the rare earth elements are added finally after the smelting of the rest elements is completed, so that the aim of the invention is to control sulfides in a steel structural member to play a role in desulfurization and deoxidation, and to improve the solubility of hydrogen in the steel structural member to play a role in inhibiting brittleness and white spots caused by the hydrogen in the steel. The rare earth element used in the invention is Pr, and also comprises Nd, Yb and Sc, wherein the Pr has stronger activity and softer texture, and the auxiliary effects of Nd, Yb and Sc not only can play a role in controlling sulfur and hydrogen, but also can improve the toughness of a steel structural member.
Secondly, the high-strength steel component is prepared by adopting a heat treatment process of twice rolling, once quenching and twice tempering, wherein in the twice rolling, the first time is rolling at normal temperature, and the second time is high-temperature rolling, so that a proper deformation structure, texture and internal energy state is obtained, a basic condition is laid for flexible structure regulation and control of subsequent low-cost hot stamping forming, and the multi-scale and multi-phase regulation and control of a hot stamping forming structural component can be realized by matching with subsequent heating path regulation and control of hot forming and cooling paths after heating, so that multiple performance regulation of a single-component blank is realized, the advantage of flexible regulation and control is achieved, a high-temperature microstructure is regulated and controlled, and superfine and diversified preparation of the high-strength steel component is realized. The quenching temperature used in the primary quenching is higher than the ordinary temperature, because the main existing forms of alloy elements in the steel are compounds such as carbide and the like and are dissolved in a matrix, and the compounds and the matrix can be mutually converted in the heat treatment process, so that the conversion can be more uniform by properly raising the temperature, the thermal fatigue performance of the steel structure is improved, and better toughness and plasticity are obtained. In the two tempering, the tempering temperature is lower than that in the common condition, so that the generated eutectic carbide which influences the toughness is further eliminated on the basis of not destroying the uniformity of the structure, thereby maintaining the toughness of the steel structure.
Detailed Description
The invention is further described with reference to the following examples.
Example 1
A high-strength steel structural member for building curtain wall engineering comprises the following components in percentage by weight:
0.06% of C, 0.3% of Si, 0.3% of V, 0.1% of Cr, 0.02% of Al, 0.1% of Hf, 0.1% of Mo, 1.2% of Mn, 0.05% of Ir, 0.06% of rare earth elements, less than or equal to 0.005% of S, less than or equal to 0.015% of P, and the balance of Fe and inevitable impurities.
The rare earth elements are Pr, Nd and Yb, and the mass ratio of Pr, Nd and Yb is 1:0.2: 0.6.
The heat treatment process of the high-strength steel structural member for the building curtain wall engineering comprises the following steps of:
step 1, smelting a steel billet: smelting in a converter according to the following components in percentage by weight: 0.06% of C, 0.3% of Si, 0.3% of V, 0.1% of Cr, 0.02% of Al, 0.1% of Hf, 0.1% of Mo, 1.2% of Mn, 0.05% of Ir, 0.06% of rare earth elements, less than or equal to 0.005% of S, less than or equal to 0.015% of P, and the balance of Fe and inevitable impurities; casting on a die to form a steel plate, and adding a rare earth element metal wire in the casting process, wherein the weight ratio of the added rare earth element is 0.06%, so as to obtain a steel plate billet;
step 2, rolling for the first time: air-cooling the steel plate billet to room temperature, polishing the steel plate billet until the surface is smooth, and performing primary rolling at the room temperature to obtain a primary rolled steel plate; wherein the rolling adopts an alternate asynchronous rolling mode, the rolling differential speed ratio is 1: 1.2-1.6, and the total rolling reduction rate is 60-65%;
step 3, rolling for the second time: placing the first rolled steel plate in a resistance furnace, heating to 400-600 ℃, forging for 0.1-0.2 h, and then performing second rolling at the temperature to obtain a second rolled steel plate; wherein the deformation amount of the second rolling is 65-90%, and the deformation speed is 10-100 s-1；
Step 4, preheating: under the protection of nitrogen, heating the second rolled steel plate to 800-900 ℃, and preserving heat for 0.3-0.5 h to obtain a preheated steel plate;
step 5, quenching treatment: under the protection of nitrogen, continuously heating the preheated steel plate to 1050-1250 ℃, preserving heat for 0.5-0.8 h, carrying out oil quenching, and cooling to room temperature to obtain a quenched steel plate;
step 6, tempering for the first time: placing the quenched steel plate in a tempering furnace, heating to 600-620 ℃ at the speed of 10 ℃/min, tempering for 2-3 h, and then air-cooling to room temperature to obtain a first tempered steel plate;
and 7, tempering for the second time: and directly placing the first tempered steel plate in a tempering furnace at 560-580 ℃, tempering for 1-2 hours, and then air-cooling to room temperature to obtain the high-strength steel structural member.
The high-strength steel structural member for the building curtain wall engineering prepared by the embodiment has the yield strength of 698-725 MPa, the tensile strength of 722-743 MPa, the elongation of 32.2-34.3% and the impact energy of 225-240J.
Example 2
A high-strength steel structural member for building curtain wall engineering comprises the following components in percentage by weight:
0.12 percent of C, 0.6 percent of Si, 0.6 percent of V, 0.1 to 0.4 percent of Cr, 0.03 percent of Al, 0.4 percent of Hf, 0.3 percent of Mo, 1.8 percent of Mn, 0.1 percent of Ir, 0.2 percent of rare earth elements, less than or equal to 0.005 percent of S, less than or equal to 0.015 percent of P, and the balance of Fe and inevitable impurities.
The rare earth elements are Pr, Nd and Yb, and the mass ratio of Pr, Nd and Yb is 1:0.8: 1.5.
The heat treatment process of the high-strength steel structural member for the building curtain wall engineering comprises the following steps of:
step 1, smelting a steel billet: smelting in a converter according to the following components in percentage by weight: 0.12 percent of C, 0.6 percent of Si, 0.6 percent of V, 0.1 to 0.4 percent of Cr, 0.03 percent of Al, 0.4 percent of Hf, 0.3 percent of Mo, 1.8 percent of Mn, 0.1 percent of Ir, 0.2 percent of rare earth elements, less than or equal to 0.005 percent of S, less than or equal to 0.015 percent of P, and the balance of Fe and inevitable impurities; casting on a die to form a steel plate, and adding a rare earth element metal wire in the casting process, wherein the weight ratio of the added rare earth element is 0.2%, so as to obtain a steel plate billet;
step 2, rolling for the first time: air-cooling the steel plate billet to room temperature, polishing the steel plate billet until the surface is smooth, and performing primary rolling at the room temperature to obtain a primary rolled steel plate; wherein the rolling adopts an alternate asynchronous rolling mode, the rolling differential speed ratio is 1: 1.2-1.6, and the total rolling reduction rate is 60-65%;
step 3, rolling for the second time: placing the first rolled steel plate in a resistance furnace, heating to 400-600 ℃, forging for 0.1-0.2 h, and then performing second rolling at the temperature to obtain a second rolled steel plate; wherein the deformation amount of the second rolling is 65-90%, and the deformation speed is 10-100 s-1；
Step 4, preheating: under the protection of nitrogen, heating the second rolled steel plate to 800-900 ℃, and preserving heat for 0.3-0.5 h to obtain a preheated steel plate;
step 5, quenching treatment: under the protection of nitrogen, continuously heating the preheated steel plate to 1050-1250 ℃, preserving heat for 0.5-0.8 h, carrying out oil quenching, and cooling to room temperature to obtain a quenched steel plate;
step 6, tempering for the first time: placing the quenched steel plate in a tempering furnace, heating to 600-620 ℃ at the speed of 10 ℃/min, tempering for 2-3 h, and then air-cooling to room temperature to obtain a first tempered steel plate;
and 7, tempering for the second time: and directly placing the first tempered steel plate in a tempering furnace at 560-580 ℃, tempering for 1-2 hours, and then air-cooling to room temperature to obtain the high-strength steel structural member.
The high-strength steel structural member for the building curtain wall engineering prepared by the embodiment has the yield strength of 684-712 MPa, the tensile strength of 715-734 MPa, the elongation of 30.4-31.7% and the impact energy of 218-232J.
Example 3
The high-strength steel structural member for building curtain wall engineering and its heat treatment process raise the toughness of available high-strength steel structural member for building curtain wall engineering greatly.
The technical scheme of the invention is as follows:
the invention aims to provide a high-strength steel structural member for building curtain wall engineering, which comprises the following components in percentage by weight:
0.08 percent of C, 0.4 percent of Si, 0.5 percent of V, 0.3 percent of Cr, 0.03 percent of Al, 0.2 percent of Hf, 0.2 percent of Mo, 1.5 percent of Mn, 0.07 percent of Ir, 0.12 percent of rare earth elements, less than or equal to 0.005 percent of S, less than or equal to 0.015 percent of P, and the balance of Fe and inevitable impurities.
The rare earth elements are Pr, Yb and Sc, and the mass ratio of Pr, Yb and Sc is 1:1.2: 2.3.
The heat treatment process of the high-strength steel structural member for the building curtain wall engineering comprises the following steps of:
step 1, smelting a steel billet: smelting in a converter according to the following components in percentage by weight: 0.08 percent of C, 0.4 percent of Si, 0.5 percent of V, 0.3 percent of Cr, 0.03 percent of Al, 0.2 percent of Hf, 0.2 percent of Mo, 1.5 percent of Mn, 0.07 percent of Ir, 0.12 percent of rare earth elements, less than or equal to 0.005 percent of S, less than or equal to 0.015 percent of P, and the balance of Fe and inevitable impurities; casting a steel plate on a mould, and adding a rare earth element metal wire in the casting process, wherein the weight ratio of the added rare earth element is 0.1-0.16%, so as to obtain a steel plate billet;
step 2, rolling for the first time: air-cooling the steel plate billet to room temperature, polishing the steel plate billet until the surface is smooth, and performing primary rolling at the room temperature to obtain a primary rolled steel plate; wherein the rolling adopts an alternate asynchronous rolling mode, the rolling differential speed ratio is 1: 1.2-1.6, and the total rolling reduction rate is 60-65%;
step 3, rolling for the second time: placing the first rolled steel plate in a resistance furnace, heating to 400-600 ℃, forging for 0.1-0.2 h, and then performing second rolling at the temperature to obtain a second rolled steel plate; wherein the deformation amount of the second rolling is 65-90%, and the deformation speed is 10-100 s-1；
Step 4, preheating: under the protection of nitrogen, heating the second rolled steel plate to 800-900 ℃, and preserving heat for 0.3-0.5 h to obtain a preheated steel plate;
step 5, quenching treatment: under the protection of nitrogen, continuously heating the preheated steel plate to 1050-1250 ℃, preserving heat for 0.5-0.8 h, carrying out oil quenching, and cooling to room temperature to obtain a quenched steel plate;
step 6, tempering for the first time: placing the quenched steel plate in a tempering furnace, heating to 600-620 ℃ at the speed of 10 ℃/min, tempering for 2-3 h, and then air-cooling to room temperature to obtain a first tempered steel plate;
and 7, tempering for the second time: and directly placing the first tempered steel plate in a tempering furnace at 560-580 ℃, tempering for 1-2 hours, and then air-cooling to room temperature to obtain the high-strength steel structural member.
The high-strength steel structural member for the building curtain wall engineering prepared by the embodiment has the yield strength of 712-744 MPa, the tensile strength of 736-754 MPa, the elongation of 35.0-36.8% and the impact energy of 235-256J.
Example 4
A high-strength steel structural member for building curtain wall engineering comprises the following components in percentage by weight:
0.08 percent of C, 0.4 percent of Si, 0.5 percent of V, 0.3 percent of Cr, 0.03 percent of Al, 0.2 percent of Hf, 0.2 percent of Mo, 1.5 percent of Mn, 0.07 percent of Ir, 0.12 percent of rare earth elements, less than or equal to 0.005 percent of S, less than or equal to 0.015 percent of P, and the balance of Fe and inevitable impurities.
Preferably, the rare earth elements are Pr, Yb and Sc, and the mass ratio of Pr, Yb and Sc is 1:1.7: 3.5.
Another object of the present invention is to provide a heat treatment process for a high-strength steel structural member for a construction curtain wall engineering, comprising the steps of:
step 1, smelting a steel billet: smelting in a converter according to the following components in percentage by weight: 0.08 percent of C, 0.4 percent of Si, 0.5 percent of V, 0.3 percent of Cr, 0.03 percent of Al, 0.2 percent of Hf, 0.2 percent of Mo, 1.5 percent of Mn, 0.07 percent of Ir, 0.12 percent of rare earth elements, less than or equal to 0.005 percent of S, less than or equal to 0.015 percent of P, and the balance of Fe and inevitable impurities; casting a steel plate on a mould, and adding a rare earth element metal wire in the casting process, wherein the weight ratio of the added rare earth element is 0.06-0.2%, so as to obtain a steel plate billet;
step 2, rolling for the first time: air-cooling the steel plate billet to room temperature, polishing the steel plate billet until the surface is smooth, and performing primary rolling at the room temperature to obtain a primary rolled steel plate; wherein the rolling adopts an alternate asynchronous rolling mode, the rolling differential speed ratio is 1: 1.2-1.6, and the total rolling reduction rate is 60-65%;
step 3, rolling for the second time: placing the first rolled steel plate in a resistance furnace, heating to 400-600 ℃, forging for 0.1-0.2 h, and then performing second rolling at the temperature to obtain a second rolled steel plate; wherein the deformation amount of the second rolling is 65-90%, and the deformation speed is 10-100 s-1；
Step 4, preheating: under the protection of nitrogen, heating the second rolled steel plate to 800-900 ℃, and preserving heat for 0.3-0.5 h to obtain a preheated steel plate;
step 5, quenching treatment: under the protection of nitrogen, continuously heating the preheated steel plate to 1050-1250 ℃, preserving heat for 0.5-0.8 h, carrying out oil quenching, and cooling to room temperature to obtain a quenched steel plate;
step 6, tempering for the first time: placing the quenched steel plate in a tempering furnace, heating to 600-620 ℃ at the speed of 10 ℃/min, tempering for 2-3 h, and then air-cooling to room temperature to obtain a first tempered steel plate;
and 7, tempering for the second time: and directly placing the first tempered steel plate in a tempering furnace at 560-580 ℃, tempering for 1-2 hours, and then air-cooling to room temperature to obtain the high-strength steel structural member.
The high-strength steel structural member for building curtain wall engineering prepared by the embodiment has the yield strength of 716-736 MPa, the tensile strength of 732-747 MPa, the elongation of 34.2-36.3% and the impact energy of 239-252J.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (6)
1. A high-strength steel structural member for building curtain wall engineering is characterized by comprising the following components in percentage by weight:
0.06-0.12% of C, 0.3-0.6% of Si, 0.3-0.6% of V, 0.1-0.4% of Cr, 0.02-0.03% of Al, 0.1-0.4% of Hf, 0.1-0.3% of Mo, 1.2-1.8% of Mn, 0.05-0.1% of Ir, 0.06-0.2% of rare earth elements, less than or equal to 0.005% of S, less than or equal to 0.015% of P, and the balance of Fe and inevitable impurities.
2. The high-strength steel structural member for the building curtain wall engineering as claimed in claim 1, wherein the high-strength steel structural member for the building curtain wall engineering comprises the following components in percentage by weight:
0.08-0.1% of C, 0.4-0.5% of Si, 0.3-0.5% of V, 0.2-0.4% of Cr, 0.02-0.03% of Al, 0.2-0.3% of Hf, 0.2-0.3% of Mo, 1.3-1.5% of Mn, 0.08-0.1% of Ir, 0.1-0.16% of rare earth elements, less than or equal to 0.005% of S, less than or equal to 0.015% of P, rare earth elements and the balance of Fe and inevitable impurities.
3. A high strength steel structural member for construction curtain wall engineering according to claim 1, wherein the rare earth element includes Pr and at least two of Nd, Yb and Sc.
4. The high-strength steel structural member for the building curtain wall engineering according to claim 3, wherein the rare earth elements are Pr, Nd and Yb, and the mass ratio of the Pr, Nd and Yb is 1: 0.2-0.8: 0.6-1.5.
5. The high-strength steel structural member for the building curtain wall engineering as claimed in claim 3, wherein the rare earth elements are Pr, Yb and Sc, and the mass ratio of Pr, Yb and Sc is 1: 1.2-1.7: 2.3-3.5.
6. A heat treatment process for a high-strength steel structural member for building curtain wall engineering as claimed in any one of claims 1 to 5, characterized by comprising the steps of:
step 1, smelting a steel billet: smelting in a converter according to the following components in percentage by weight: 0.06-0.12% of C, 0.3-0.6% of Si, 0.3-0.6% of V, 0.1-0.4% of Cr, 0.02-0.03% of Al, 0.1-0.4% of Hf, 0.1-0.3% of Mo, 1.2-1.8% of Mn, 0.05-0.1% of Ir, less than or equal to 0.005% of S, less than or equal to 0.015% of P, and the balance of Fe and inevitable impurities; casting a steel plate on a mould, and adding a rare earth element metal wire in the casting process, wherein the weight ratio of the added rare earth element is 0.06-0.2%, so as to obtain a steel plate billet;
step 2, rolling for the first time: air-cooling the steel plate billet to room temperature, polishing the steel plate billet until the surface is smooth, and performing primary rolling at the room temperature to obtain a primary rolled steel plate; wherein the rolling adopts an alternate asynchronous rolling mode, the rolling differential speed ratio is 1: 1.2-1.6, and the total rolling reduction rate is 60-65%;
step 3, rolling for the second time: placing the first rolled steel plate in a resistance furnace, heating to 400-600 ℃, forging for 0.1-0.2 h, and then performing second rolling at the temperature to obtain a second rolled steel plate; wherein the deformation amount of the second rolling is 65-90%, and the deformation speed is 10-100 s-1；
Step 4, preheating: under the protection of nitrogen, heating the second rolled steel plate to 800-900 ℃, and preserving heat for 0.3-0.5 h to obtain a preheated steel plate;
step 5, quenching treatment: under the protection of nitrogen, continuously heating the preheated steel plate to 1050-1250 ℃, preserving heat for 0.5-0.8 h, carrying out oil quenching, and cooling to room temperature to obtain a quenched steel plate;
step 6, tempering for the first time: placing the quenched steel plate in a tempering furnace, heating to 600-620 ℃ at the speed of 10 ℃/min, tempering for 2-3 h, and then air-cooling to room temperature to obtain a first tempered steel plate;
and 7, tempering for the second time: and directly placing the first tempered steel plate in a tempering furnace at 560-580 ℃, tempering for 1-2 hours, and then air-cooling to room temperature to obtain the high-strength steel structural member.
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