CN112011728A - Structural steel and manufacturing method thereof - Google Patents

Structural steel and manufacturing method thereof Download PDF

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Publication number
CN112011728A
CN112011728A CN201910451750.3A CN201910451750A CN112011728A CN 112011728 A CN112011728 A CN 112011728A CN 201910451750 A CN201910451750 A CN 201910451750A CN 112011728 A CN112011728 A CN 112011728A
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rolling
cooling
structural steel
temperature
controlled
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CN112011728B (en
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孔伟
李占杰
毛天成
郝英敏
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • 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
    • 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
    • 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
    • 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
    • C21D2211/008—Martensite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention discloses structural steel, which comprises the following chemical components in percentage by mass: c: 0.13-0.18%, Si: 0.2-0.4%, Mn: 0.8-0.99%, Al: 0.04-0.06%, and the balance of Fe and other inevitable impurities. In addition, the invention also discloses a manufacturing method, which comprises the following steps: heating, rolling and cooling; wherein: in the heating step, the heating temperature of the plate blank is 1050-; in the rolling step, the recrystallization rolling temperature is controlled to be more than or equal to 980 ℃; the non-recrystallization rolling temperature is rolling at the beginning: 980-880 ℃, finish rolling: 900 ℃ and 800 ℃; in the cooling step, the cooling rate is controlled to be 3-15 ℃/s, and the cooling termination temperature is 650-750 ℃. The structural steel has excellent mechanical properties in different strength levels and has better extension impact performance.

Description

Structural steel and manufacturing method thereof
Technical Field
The invention relates to a steel grade and a manufacturing method thereof, in particular to a steel grade with higher strength and a manufacturing method thereof.
Background
The steel plate obtained by the controlled cooling and controlled rolling (TMCP for short) process is characterized in that the rolling temperature and the cooling temperature are controlled in the rolling process so as to realize the excellent performance of the steel plate, and the application field of the steel plate is very wide. This is because: TMCP is a process for saving alloy and energy, and compared with the traditional microalloy high-strength ship plate steel, the steel plate produced by rolling under the control of the TMCP process has similar performance, the addition of alloy elements can be greatly reduced, and the economic advantage is very obvious. In addition, the crystal grains of the steel plate can be refined by adopting the TMCP process for rolling, and different metallographic structures can be obtained by controlling the cooling temperature and the cooling rate, so that the possibility of obtaining different mechanical properties by using the same component can be realized.
In the prior art, for example: chinese patent publication No. CN102021293A, published as 2011, 4/20/3, entitled "a Q345Q reduction rolling method", discloses a Q345Q reduction rolling method. In the technical scheme disclosed in the patent document, a Q345Q product with better performance is obtained by heating and rolling control by adopting a low-cost component system slab, and is characterized in that high-carbon manganese is adopted and an alloy-free low-cost component is adopted.
Another example is: chinese patent publication No. CN107326273A, published as 2017, 11, 7 and entitled "steel sheet for vanadium-nitrogen Q460 strength-rated low-temperature containers and method for producing same" discloses a steel sheet for vanadium-nitrogen Q460 strength-rated low-temperature containers. In the technical proposal disclosed in the patent document, the obtained vanadium-nitrogen-based Q460 strength-grade steel plate for the low-temperature container has uniform overall performance and structure and excellent impact toughness at-40 ℃. However, the proposal disclosed in the patent document is that V, Ni element is added, the V content is 0.15-0.20%, the Ni content is 0.25-0.35, and the low-temperature impact performance is good.
Based on this, it is desired to obtain a new structural steel which can produce a dual phase structure of fine-grained ferrite and a small ratio of martensite in a high strength grade steel to achieve a high tensile strength.
Disclosure of Invention
It is an object of the present invention to provide a structural steel which is excellent in mechanical properties and has good elongation impact properties.
In order to achieve the purpose, the invention provides structural steel, which comprises the following chemical elements in percentage by mass:
c: 0.13-0.18%, Si: 0.2-0.4%, Mn: 0.8-0.99%, Al: 0.04-0.06%, and the balance of Fe and other inevitable impurities.
In the structural steel of the invention, in order to fully utilize the TMCP process to adjust the microstructure of the steel plate, the inventor designs the component proportion of each chemical element, so that the structural steel of the invention has excellent mechanical property and better extension impact property. The design principle of each chemical element in the scheme is as follows:
c: c is an element for increasing the strength of the steel. The strength of the steel can be improved by the aid of carbon under the solid solution strengthening effect. Based on this, the mass percentage of C in the structural steel of the present invention is controlled to be 0.13 to 0.18%.
Si: si is added into the common carbon steel as a deoxidizer. Proper amount of silicon can raise the strength of steel product, and has no obvious adverse effect on plasticity, impact toughness, cold bending performance and weldability. Based on this, the mass percentage of Si in the structural steel of the present invention is controlled to be 0.2 to 0.4%.
Mn: mn is a weak deoxidizer. The proper amount of manganese can effectively improve the strength of the steel, eliminate the influence of sulfur and oxygen on the hot brittleness of the steel, improve the hot workability of the steel, improve the cold brittleness tendency of the steel and not obviously reduce the plasticity and impact toughness of the steel. Based on this, the mass percentage of Mn in the structural steel of the present invention is controlled to be 0.8 to 0.99%.
Al: mainly used as a deoxidizing and nitrogen-fixing agent in steel making, can refine grains, inhibit the aging of low-carbon steel, improve the toughness of the steel at low temperature, and particularly reduce the brittle transition temperature of the steel. Based on this, the mass percentage of Al in the structural steel of the present invention is controlled to be 0.04 to 0.06%.
Further, the structural steel of the present invention further contains V, Nb and at least one of Ti as a steelmaking residual element, and V + Nb + Ti is 0.02% or less.
It should be noted that in the above scheme, V, Nb and Ti can be added when scrap steel is added in steel making, so V, Nb and Ti do not need to be additionally added, thereby saving the manufacturing cost of the structural steel of the present case and improving the recycling rate of materials.
Further, in the structural steel according to the invention, P is less than or equal to 0.015% and/or S is less than or equal to 0.01% among other unavoidable impurities.
Furthermore, in the structural steel of the invention, the thickness of the structural steel is less than or equal to 20 mm.
Further, in the structural steel of the present invention, the microstructure is polygonal ferrite.
In the scheme, the chemical element components of the scheme are matched to ensure that the structural steel has the multi-deformation ferrite when the thickness is less than or equal to 20mm, so that the high strength and the excellent toughness of the steel plate are ensured.
Furthermore, in the structural steel of the invention, the yield strength is not less than 345MPa, the tensile strength is 470-630MPa, and the elongation A is5≥26％。
Furthermore, in the structural steel of the present invention, the yield strength is not less than 390MPa, the tensile strength is 490-650MPa, and the elongation A is5≥21％。
Further, in the structural steel of the present invention, the microstructure is polygonal ferrite + acicular ferrite + martensite, wherein the microstructure of the surface of the steel sheet is martensite, the core of the steel sheet is polygonal ferrite, and the transition zone in the thickness range from the surface of the steel sheet to the thickness of 3mm is a mixed structure of acicular ferrite and martensite.
In the scheme, the microstructure is controlled to be a dual-phase structure of fine-grain ferrite and a small proportion of martensite, so that the structural steel can achieve the implementation effect of high tensile strength.
Furthermore, in the structural steel of the invention, the yield strength is not less than 420MPa, the tensile strength is 520-670MPa, and the elongation A is5≥21％。
Further, in the structural steel of the present invention, the microstructure is polygonal ferrite + acicular ferrite + martensite, wherein the microstructure of the surface of the steel sheet is martensite, the core of the steel sheet is polygonal ferrite, and the transition zone in the thickness range from the surface of the steel sheet to the thickness of 5mm is a mixed structure of acicular ferrite and martensite.
In the scheme, the microstructure is controlled to be a dual-phase structure of fine-grain ferrite and a small proportion of martensite, so that the structural steel can achieve the implementation effect of high tensile strength.
Furthermore, in the structural steel of the invention, the yield strength is not less than 460MPa, the tensile strength is 550-720MPa, and the elongation A is5≥17％。
Accordingly, another object of the present invention is to provide a manufacturing method by which structural steel having a yield strength of 345MPa or more can be obtained.
In order to achieve the above object, the present invention proposes a manufacturing method comprising the steps of: heating, rolling and cooling; wherein:
in the heating step, the heating temperature of the plate blank is 1050-;
in the rolling step, the recrystallization rolling temperature is controlled to be more than or equal to 980 ℃; the non-recrystallization rolling temperature is rolling at the beginning: 980-880 ℃, finish rolling: 900 ℃ and 800 ℃;
in the cooling step, the cooling rate is controlled to be 3-15 ℃/s, and the cooling termination temperature is 650-750 ℃.
In the manufacturing method, the chemical composition design of the scheme is matched, the structural steel with the thickness of less than 20mm can be ensured to have a changeable ferrite structure after controlled rolling and controlled cooling, and the microstructure ensures that the structural steel has high strength and excellent toughness.
Accordingly, it is still another object of the present invention to provide a manufacturing method by which a structural steel having a yield strength of 390MPa or more can be obtained.
In order to achieve the above object, the present invention proposes a manufacturing method comprising the steps of: heating, rolling and cooling; wherein:
in the heating step, the heating temperature of the plate blank is 1050-;
in the rolling step, the recrystallization rolling temperature is controlled to be more than or equal to 980 ℃; the non-recrystallization rolling temperature is rolling at the beginning: 980-850 ℃, finish rolling: 880-750 ℃;
in the cooling step, the cooling speed is controlled to be 5-20 ℃/s, and the cooling temperature is stopped to be 600-750 ℃.
In the manufacturing method, the chemical composition design of the scheme is matched, the structural steel with the thickness of less than 20mm can be ensured to have a changeable ferrite structure after controlled rolling and controlled cooling, and the microstructure ensures that the structural steel has high strength and excellent toughness.
Accordingly, it is still another object of the present invention to provide a manufacturing method by which structural steel having a yield strength of 420MPa or more can be obtained.
In order to achieve the above object, the present invention proposes a manufacturing method comprising the steps of: heating, rolling and cooling; wherein:
in the heating step, the heating temperature of the plate blank is 1050-;
in the rolling step, the recrystallization rolling temperature is controlled to be more than or equal to 950 ℃; the non-recrystallization rolling temperature is rolling at the beginning: and (3) at 920-850 ℃, finish rolling: 870 ℃ and 750 ℃;
in the cooling step, the cooling speed is controlled to be 10-25 ℃/s, and the cooling termination temperature is 550-750 ℃.
In the manufacturing method, the design of chemical components is matched, the structural steel with the thickness of less than 20mm can be ensured to have changeable ferrite and a small amount of martensite structures (for example, a transition zone from the surface of the steel plate to the thickness of 3mm is a mixed structure of acicular ferrite and martensite) after controlled rolling and controlled cooling, and the microstructure ensures that the structural steel has high strength and excellent toughness.
Accordingly, another object of the present invention is to provide a manufacturing method by which structural steel having a yield strength of 460MPa or more can be obtained.
In order to achieve the above object, the present invention proposes a manufacturing method comprising the steps of: heating, rolling and cooling; wherein:
in the heating step, the heating temperature of the plate blank is 1050-;
in the rolling step, the recrystallization rolling temperature is controlled to be more than or equal to 950 ℃; the non-recrystallization rolling temperature is rolling at the beginning: and (3) finishing rolling at 900-800 ℃: 820 ℃ and 740 ℃;
in the cooling step, the cooling speed is controlled to be 15-25 ℃/s, and the cooling termination temperature is controlled to be 500-700 ℃.
In the manufacturing method, the design of chemical components is matched, the structural steel with the thickness of less than 20mm can be ensured to have changeable ferrite and a small amount of martensite structures (for example, a transition zone from the surface of the steel plate to the thickness of 5mm is a mixed structure of acicular ferrite and martensite) after controlled rolling and controlled cooling, and the microstructure ensures that the structural steel has high strength and excellent toughness.
In conclusion, the structural steel can obtain steel plates with different strength levels by the chemical component design of the scheme and the matching of the controlled cooling control technology, and the structural steel has excellent mechanical properties and better extension impact performance.
In addition, the structural steel disclosed by the invention is simple in chemical components and low in economic cost.
Detailed Description
The structural steel and the method for manufacturing the same according to the present invention will be further explained and illustrated with reference to specific examples, which, however, should not be construed as unduly limiting the technical solution of the present invention.
Examples 1 to 12
The structural steels of examples 1-12 above were prepared using the following procedure: heating, rolling and cooling were carried out according to the chemical composition shown in table 1.
Among the steps of examples 1 to 3: in the heating step, the heating temperature of the plate blank is 1050-; in the rolling step, the recrystallization rolling temperature is controlled to be more than or equal to 980 ℃; the non-recrystallization rolling temperature is rolling at the beginning: 980-880 ℃, finish rolling: 900 ℃ and 800 ℃; in the cooling step, the cooling rate is controlled to be 3-15 ℃/s, and the cooling termination temperature is 650-750 ℃.
In the procedure of examples 4 to 6: during the heating step, the heating temperature of the plate blank is 1050-1150 ℃; in the rolling step, the recrystallization rolling temperature is controlled to be more than or equal to 980 ℃; the non-recrystallization rolling temperature is rolling at the beginning: 980-850 ℃, finish rolling: 880-750 ℃; in the cooling step, the cooling speed is controlled to be 5-20 ℃/s, and the cooling temperature is stopped to be 600-750 ℃.
In the procedure of examples 7 to 9: in the heating step, the heating temperature of the plate blank is 1050-; in the rolling step, the recrystallization rolling temperature is controlled to be more than or equal to 950 ℃; the non-recrystallization rolling temperature is rolling at the beginning: and (3) at 920-850 ℃, finish rolling: 870 ℃ and 750 ℃; in the cooling step, the cooling speed is controlled to be 10-25 ℃/s, and the cooling termination temperature is 550-750 ℃.
In the procedure of examples 10 to 12: in the heating step, the heating temperature of the plate blank is 1050-; in the rolling step, the recrystallization rolling temperature is controlled to be more than or equal to 950 ℃; the non-recrystallization rolling temperature is rolling at the beginning: and (3) finishing rolling at 900-800 ℃: 820 ℃ and 740 ℃; in the cooling step, the cooling speed is controlled to be 15-25 ℃/s, and the cooling termination temperature is controlled to be 500-700 ℃.
Table 1 shows the mass percentages of the chemical elements of the structures of examples 1-12.
TABLE 1 (wt%, balance Fe and unavoidable impurities other than P and S)
Figure BDA0002075361350000061
Table 2 lists specific process parameters for the structural steels of examples 1-12.
Table 2.
Figure BDA0002075361350000062
Figure BDA0002075361350000071
Table 3 shows the results of various mechanical property tests of the structural steels of examples 1 to 12 in this case.
Table 3.
Figure BDA0002075361350000072
Figure BDA0002075361350000081
As can be seen from Table 3, the microstructure of the structural steels of examples 1 to 3 of this case was a changeable ferrite, and the yield strength thereof was 345MPa or more, the tensile strength thereof was 470-630MPa, and the elongation A was5Not less than 26 percent; the microstructure of the structural steels of examples 4-6 was polygonal ferrite, and the yield strength was 390MPa or more, the tensile strength was 490-650MPa, and the elongation A was5Not less than 21 percent; the microstructure of the structural steels of examples 7 to 9 was polygonal ferrite + acicular ferrite + martensite, wherein the microstructure of the steel sheet surface was martensite, the steel sheet core was polygonal ferrite, the transition zone from the steel sheet surface to the thickness of 3mm was a mixed structure of acicular ferrite and martensite, and the yield strength was not less than 420MPa, the tensile strength was 520-670MPa, and the elongation A was5Not less than 21 percent; the structural steels of examples 10 to 12 had microstructures of polygonal ferrite + acicular ferrite + martensite, wherein the microstructure of the steel sheet surface was martensite, the core of the steel sheet was polygonal ferrite, the transition zone from the steel sheet surface to the thickness of 5mm was a mixed structure of acicular ferrite and martensite, and the yield strength was 460MPa or more, the tensile strength was 550-720MPa, and the elongation A was5≥17％。
In conclusion, the structural steel can obtain steel plates with different strength levels by the chemical component design of the scheme and the matching of the controlled cooling control technology, and the structural steel has excellent mechanical properties and better extension impact performance.
In addition, the structural steel disclosed by the invention is simple in chemical components and low in economic cost.
It should be noted that the prior art in the protection scope of the present invention is not limited to the examples given in the present application, and all the prior art which is not inconsistent with the technical scheme of the present invention, including but not limited to the prior patent documents, the prior publications and the like, can be included in the protection scope of the present invention.
In addition, the combination of the features in the present application is not limited to the combination described in the claims of the present application or the combination described in the embodiments, and all the features described in the present application may be freely combined or combined in any manner unless contradictory to each other.
It should also be noted that the above-mentioned embodiments are only specific examples of the present invention, and it is obvious that the present invention is not limited to the above-mentioned embodiments, and many similar variations are possible. All modifications which would occur to one skilled in the art and which are, therefore, directly derived or suggested from the disclosure herein are deemed to be within the scope of the present invention.

Claims (15)

1. The structural steel is characterized by comprising the following chemical elements in percentage by mass:
c: 0.13-0.18%, Si: 0.2-0.4%, Mn: 0.8-0.99%, Al: 0.04-0.06%, and the balance of Fe and other inevitable impurities.
2. The structural steel of claim 1, further comprising V, Nb and at least one of Ti as a steelmaking residue, and V + Nb + Ti is 0.02% or less.
3. The structural steel according to claim 1, characterized in that P.ltoreq.0.015% and/or S.ltoreq.0.01% among other unavoidable impurities.
4. The structural steel of claim 1, wherein the structural steel has a thickness of 20mm or less.
5. The structural steel of claim 4, wherein the microstructure is polygonal ferrite.
6. The structural steel as claimed in claim 5, wherein the yield strength is 345MPa or more, the tensile strength is 470 MPa or more and 630MPa or less, and the elongation A is5≥26％。
7. The structural steel as claimed in claim 5, wherein the yield strength is 390MPa or more, the tensile strength is 490-650MPa, and the elongation A is5≥21％。
8. The structural steel of claim 4, wherein the microstructure is polygonal ferrite + acicular ferrite + martensite, wherein the microstructure of the surface of the steel sheet is martensite, the core of the steel sheet is polygonal ferrite, and the transition zone in the thickness range from the surface of the steel sheet to the thickness of 3mm is a mixed structure of acicular ferrite and martensite.
9. The structural steel as claimed in claim 8, wherein the yield strength is 420MPa or more, the tensile strength is 520 MPa and 670MPa, and the elongation A is5≥21％。
10. The structural steel of claim 4, wherein the microstructure is polygonal ferrite + acicular ferrite + martensite, wherein the microstructure of the surface of the steel sheet is martensite, the core of the steel sheet is polygonal ferrite, and the transition zone in the thickness range from the surface of the steel sheet to the thickness of 5mm is a mixed structure of acicular ferrite and martensite.
11. The structural steel as claimed in claim 10, wherein the yield strength is 460MPa or more, the tensile strength is 550 MPa or more and 720MPa or less, and the elongation A is5≥17％。
12. The method of manufacturing structural steel as claimed in claim 6, comprising the steps of: heating, rolling and cooling; wherein:
in the heating step, the heating temperature of the plate blank is 1050-;
in the rolling step, the recrystallization rolling temperature is controlled to be more than or equal to 980 ℃; the non-recrystallization rolling temperature is rolling at the beginning: 980-880 ℃, finish rolling: 900 ℃ and 800 ℃;
in the cooling step, the cooling rate is controlled to be 3-15 ℃/s, and the cooling termination temperature is 650-750 ℃.
13. The method of manufacturing structural steel as claimed in claim 7, comprising the steps of: heating, rolling and cooling; wherein:
in the heating step, the heating temperature of the plate blank is 1050-;
in the rolling step, the recrystallization rolling temperature is controlled to be more than or equal to 980 ℃; the non-recrystallization rolling temperature is rolling at the beginning: 980-850 ℃, finish rolling: 880-750 ℃;
in the cooling step, the cooling speed is controlled to be 5-20 ℃/s, and the cooling temperature is stopped to be 600-750 ℃.
14. The method of manufacturing structural steel as claimed in claim 9, comprising the steps of: heating, rolling and cooling; wherein:
in the heating step, the heating temperature of the plate blank is 1050-;
in the rolling step, the recrystallization rolling temperature is controlled to be more than or equal to 950 ℃; the non-recrystallization rolling temperature is rolling at the beginning: and (3) at 920-850 ℃, finish rolling: 870 ℃ and 750 ℃;
in the cooling step, the cooling speed is controlled to be 10-25 ℃/s, and the cooling termination temperature is 550-750 ℃.
15. The method of manufacturing structural steel as claimed in claim 11, comprising the steps of: heating, rolling and cooling; wherein:
in the heating step, the heating temperature of the plate blank is 1050-;
in the rolling step, the recrystallization rolling temperature is controlled to be more than or equal to 950 ℃; the non-recrystallization rolling temperature is rolling at the beginning: and (3) finishing rolling at 900-800 ℃: 820 ℃ and 740 ℃;
in the cooling step, the cooling speed is controlled to be 15-25 ℃/s, and the cooling termination temperature is controlled to be 500-700 ℃.
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