CN114058955B - High-cracking-resistance steel plate for ocean structure and production method thereof - Google Patents

High-cracking-resistance steel plate for ocean structure and production method thereof Download PDF

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CN114058955B
CN114058955B CN202111249526.XA CN202111249526A CN114058955B CN 114058955 B CN114058955 B CN 114058955B CN 202111249526 A CN202111249526 A CN 202111249526A CN 114058955 B CN114058955 B CN 114058955B
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steel plate
rolling
temperature
steel
heat preservation
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CN114058955A (en
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王晓书
李建朝
赵国昌
龙杰
庞辉勇
高雅
吴天育
张志军
谷盟森
程海林
徐腾飞
高敏杰
向有珍
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Wuyang New Wide Heavy Steel Plate Co ltd
Wuyang Iron and Steel Co Ltd
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Wuyang New Wide Heavy Steel Plate Co ltd
Wuyang Iron and Steel Co Ltd
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    • 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
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • 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
    • 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
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • 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
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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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    • 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • 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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • 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
    • 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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
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Abstract

The invention discloses a steel plate with high cracking resistance for an ocean structure and a production method thereof, wherein the steel plate is a quenched and tempered steel plate and comprises the following chemical components in percentage by mass: c:0.06-0.10%, si:0.20-0.40%, mn:1.40-1.50%, P is less than or equal to 0.008%, S is less than or equal to 0.003%, and Ni, cr, mo, nb, ni + Cr + Mo + Nb:0.50-0.90%, the balance being Fe and unavoidable impurities; the production method comprises the steps of controlling a smelting process, a rolling process and a heat treatment process. The steel plate for the marine structure, provided by the invention, has high cracking resistance, the CTOD value is more than or equal to 0.46, the brittle fracture resistance and the fatigue failure resistance of the steel plate are greatly improved, and the production process is simple.

Description

High-cracking-resistance steel plate for ocean structure and production method thereof
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a steel plate with high cracking resistance for an ocean structure and a production method thereof.
Background
With the rapid development of ocean engineering such as ocean drilling and oil extraction platforms and the severe service environment of ocean engineering equipment, the requirements on various technical indexes of the steel plate for the ocean structure are higher and higher, and the development directions and trends are as follows: firstly, the high-strength, secondly, the large thickness, thirdly, the high toughness, fourthly, the good welding performance, fifthly, the corrosion resistance and the fatigue resistance have certain performances. Among the more prominent problems are brittle fracture and fatigue failure of marine structures, which require steel plates to have excellent crack resistance during later processing and use.
From the current industrial situation, the ocean engineering steel with the yield strength of below 355MPa basically realizes the localization and occupies 90 percent of the amount of the ocean engineering steel, however, the steel plate with the yield strength of 420MPa or above can be more suitable for the new requirements of ocean engineering equipment, and how to develop the steel plate with the thickness and the strength level and high crack cracking resistance has important significance for the localization and further popularization and application of the steel plate with the level.
In conclusion, the development of the steel plate with high cracking resistance for the marine structure has important economic and social benefits.
Disclosure of Invention
The invention aims to provide a steel plate with high cracking resistance for an ocean structure and a production method thereof.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the steel plate for the marine structure with high cracking resistance is a quenched and tempered steel plate and comprises the following chemical components in percentage by mass: c:0.06-0.10%, si:0.20-0.40%, mn:1.40-1.50%, P is less than or equal to 0.008%, S is less than or equal to 0.003%, and Ni, cr, mo, nb, ni + Cr + Mo + Nb:0.50-0.90%, and the balance of Fe and inevitable impurities.
The mechanical properties of the steel plate are as follows: the yield strength is 420-520MPa, the tensile strength is 540-640MPa, and the impact energy is more than or equal to 100J at the central position of the thickness of the steel plate at minus 40 ℃.
The CTOD value of the steel plate crack tip opening displacement is more than or equal to 0.46.
The invention relates to a production method of a steel plate for an ocean structure with high cracking resistance, which comprises the following steps:
(1) The smelting process comprises the following steps: deoxidizing and producing strong reducing slag in the refining process of an LF furnace;
(2) The rolling process comprises the following steps: when the steel plate is rolled, a two-section controlled rolling mode is adopted for rolling, the heating time coefficient before the casting blank is rolled is 2.2-2.5 min/mm, the rolling temperature in the second section is 800-850 ℃, and the temperature returns to 680-720 ℃ after rolling;
(3) The heat treatment process comprises the following steps: the heat treatment method of the steel plate comprises quenching and tempering, wherein the quenching temperature is 880-920 ℃, and the total heating and heat preservation time is 3-5min; tempering temperature is 560-580 ℃, total heat preservation time is 2-4min/mm, and discharging from the furnace for air cooling after heat preservation is finished.
The invention relates to a production method of a steel plate for an ocean structure with high cracking resistance, wherein the smelting process in the step (1) specifically comprises the following steps: feeding 0.5-1.0 kg/t steel of an aluminum wire in the refining process of an LF furnace, performing intensified deoxidation, adding 4-8 kg/t steel of lime and 2-5 kg/t steel of fluorite, after the slag is manufactured, forcibly stirring for 2-4min, and removing sulfur and impurities; the white slag time is more than or equal to 25min, the ladle skimming is carried out, the slag pouring amount is 30-50%, the Si content in the steel is less than or equal to 0.06%, and the P content is less than or equal to 0.004%.
The production method of the steel plate with high cracking resistance for the marine structure, disclosed by the invention, comprises the step (3) of 4500-5000m after quenching and heat preservation are finished 3 Water is added to cool the mixture to room temperature.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
1. the high-strength steel plate produced by the invention has high cracking resistance, the CTOD value can reach more than or equal to 0.46, the brittle fracture resistance and fatigue failure resistance of the ocean structure steel plate are greatly improved, the use in ocean environment is met, serious accidents such as cracks are avoided, and the economic loss is reduced.
2. The invention produces the quenching and tempering type steel plate for the high-grade ocean structure with excellent performance by controlling the smelting process, the rolling process and the heat treatment process.
3. The method has simple process and easy implementation, does not increase the production cost, and improves the machining performance of the steel plate.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The steel plate comprises the following chemical components in percentage by mass: c:0.06%, si:0.40%, mn:1.45%, P:0.008%, S:0.003%, and Ni, cr, mo, nb, ni + Cr + Mo + Nb:0.50%, the balance being Fe and unavoidable impurities.
The production method of the steel plate comprises the following steps:
(1) Controlling a smelting process: manufacturing strong reducing slag by deoxidation in the refining process of an LF furnace, feeding 0.5kg/t steel of an aluminum wire, strengthening deoxidation, adding 8kg/t steel of lime and 2kg/t steel of fluorite, strongly stirring for 2min after the slag is manufactured, and removing sulfur and impurities; the white slag time is 25min, the ladle skimming slag, the slag amount is 30 percent, at the moment, the Si content in the steel is 0.06 percent, and the P content is 0.004 percent. The specification of the produced casting blank is 300 × 2400mm.
(2) Controlling a rolling process: when the steel plate is rolled, a two-stage controlled rolling mode is adopted for rolling, the heating time coefficient before casting blank rolling is 2.2min/mm, the airing thickness is 165mm, the second-stage rolling temperature is 800 ℃, and the temperature returns to 680 ℃ after rolling.
(3) And (3) controlling a heat treatment process: the heat treatment method of the steel plate comprises quenching and tempering, the quenching temperature of the steel plate is 880 ℃, the total heating and heat preservation time is 3min, and 4500m is obtained after the quenching and heat preservation are finished 3 Water cooling to room temperature; and when the steel plate is tempered, a low-temperature short-time tempering process is adopted, the tempering temperature is 560 ℃, the total heat preservation time is 2min/mm, and after the heat preservation is finished, the steel plate is taken out of the furnace and is cooled in air to obtain a quenched and tempered steel plate.
The mechanical properties of the quenched and tempered steel plate produced in the embodiment are as follows: the yield strength is 442MPa, the tensile strength is 640MPa, and the central position of the thickness of the steel plate has impact energy of 250J, 265J and 271J at the temperature of minus 40 ℃; the CTOD reached 0.48.
Example 2
The steel plate comprises the following chemical components in percentage by mass: c:0.10%, si:0.20%, mn:1.40%, P:0.007%, S:0.002%, and Ni, cr, mo, nb, ni + Cr + Mo + Nb:0.80%, the balance being Fe and unavoidable impurities.
The production method of the steel plate comprises the following steps:
(1) Controlling a smelting process: the method comprises the following steps of (1) manufacturing strong reducing slag by deoxidation in an LF furnace refining process, feeding 1.0kg/t steel of an aluminum wire, performing enhanced deoxidation, adding 4kg/t steel of lime and 5kg/t steel of fluorite, performing strong stirring for 2min after the slag is manufactured, and removing sulfur and impurities; the white slag time is 30min, the ladle skimming is carried out, the slag amount is poured out by 40 percent, and at the moment, the content of Si in the steel is 0.05 percent and the content of P is 0.002 percent. The specification of the produced casting blank is 300 × 2400mm.
(2) Controlling a rolling process: when the steel plate is rolled, a two-section controlled rolling mode is adopted for rolling, the heating time coefficient before the casting blank is rolled is 2.2min/mm, the airing thickness is 165mm, the second-section rolling temperature is 850 ℃, and the temperature returns to 710 ℃ after the rolling.
(3) And (3) controlling a heat treatment process: the heat treatment method of the steel plate comprises quenching and tempering, wherein the quenching temperature of the steel plate is 900 ℃, the total heating and heat preservation time is 3min, and 5000m is obtained after the quenching and heat preservation are finished 3 Water cooling to room temperature; and (3) tempering the steel plate by adopting a low-temperature short-time tempering process, wherein the tempering temperature is 570 ℃, the total heat preservation time is 3min/mm, and after the heat preservation is finished, discharging from the furnace and air cooling to obtain the quenched and tempered steel plate.
The mechanical properties of the quenched and tempered steel plate produced in the embodiment are as follows: the yield strength is 420MPa, the tensile strength is 540MPa, and the central positions of the thickness of the steel plate are 290J, 280J and 274J of impact energy at the temperature of minus 40 ℃; the CTOD reached 0.49.
Example 3
The steel plate comprises the following chemical components in percentage by mass: c:0.07%, si:0.40%, mn:1.40%, P:0.005%, S:0.003%, and Ni, cr, mo, nb, ni + Cr + Mo + Nb:0.90%, the balance being Fe and unavoidable impurities.
The production method of the steel plate comprises the following steps:
(1) Controlling a smelting process: manufacturing strong reducing slag by deoxidation in the refining process of an LF furnace, feeding 0.6kg/t steel of an aluminum wire, strengthening deoxidation, adding 7kg/t steel of lime and 3kg/t steel of fluorite, strongly stirring for 4min after the slag is manufactured, and removing sulfur and impurities; white slag time is 25min, ladle skimming is carried out, and the slag amount is poured out by 50 percent, wherein the steel contains 0.05 percent of Si and 0.002 percent of P. The specification of the produced casting blank is 300 × 2400mm.
(2) Controlling a rolling process: when the steel plate is rolled, a two-section controlled rolling mode is adopted for rolling, the heating time coefficient before the casting blank is rolled is 2.5min/mm, the airing thickness is 165mm, the rolling temperature in the second section is 840 ℃, and the temperature returns to 720 ℃ after the rolling.
(3) And (3) controlling a heat treatment process: the heat treatment method of the steel plate comprises quenching and tempering, the quenching temperature of the steel plate is 920 ℃, the total heating and heat preservation time is 4min, and 5000m is obtained after the quenching and heat preservation are finished 3 Water cooling to room temperature; and (3) tempering the steel plate by adopting a low-temperature short-time tempering process, wherein the tempering temperature is 580 ℃, the total heat preservation time is 4min/mm, and after the heat preservation is finished, discharging from the furnace and air cooling to obtain the quenched and tempered steel plate.
The mechanical properties of the quenched and tempered steel plate produced in the embodiment are as follows: the yield strength is 440MPa, the tensile strength is 640MPa, and the central positions of the thicknesses of the steel plates are 249J, 285J and 261J of impact energy at the temperature of-40 ℃; the CTOD reached 0.51.
Example 4
The steel plate comprises the following chemical components in percentage by mass: c:0.08%, si:0.20%, mn:1.50%, P:0.004%, S:0.003%, and Ni, cr, mo, nb, ni + Cr + Mo + Nb:0.6%, the balance being Fe and unavoidable impurities.
The production method of the steel plate comprises the following steps:
(1) Controlling a smelting process: the method comprises the following steps of (1) manufacturing strong reducing slag by deoxidation in the refining process of an LF (ladle furnace), feeding 0.9kg/t steel of an aluminum wire, performing enhanced deoxidation, adding 8kg/t steel of lime and 2kg/t steel of fluorite, performing strong stirring for 4min after the slag is manufactured, and removing sulfur and impurities; the white slag time is 35min, the ladle skips the slag, and the amount of the slag is poured out by 40 percent, at this time, the content of Si in the steel is 0.06 percent, and the content of P is 0.004 percent. The specification of the produced casting blank is 300 × 2400mm.
(2) Controlling a rolling process: when the steel plate is rolled, a two-section controlled rolling mode is adopted for rolling, the heating time coefficient before the casting blank is rolled is 2.4min/mm, the steel airing thickness is 165mm, the rolling temperature in the second section is 845 ℃, and the temperature returns to 690 ℃ after the rolling.
(3) And (3) controlling a heat treatment process: the heat treatment method of the steel plate comprises quenching and tempering, the quenching temperature of the steel plate is 900 ℃, the total heating and heat preservation time is 3min, and 4500m is obtained after the quenching and heat preservation are finished 3 Water cooling to room temperature; and a low-temperature short-time tempering process is adopted during tempering of the steel plate, the tempering temperature is 560 ℃, the total heat preservation time is 3.5min/mm, and the steel plate is taken out of the furnace and cooled in air after the heat preservation is finished to obtain a quenched and tempered steel plate.
The mechanical properties of the quenched and tempered steel plate produced in the embodiment are as follows: the yield strength is 434MPa, the tensile strength is 572MPa, and the central positions 278J, 270J and 274J of the thickness of the steel plate are provided; the CTOD reached 0.46.
Example 5
The steel plate comprises the following chemical components in percentage by mass: c:0.06%, si:0.30%, mn:1.40 Percent, P:0.008%, S:0.003%, and Ni, cr, mo, nb, ni + Cr + Mo + Nb:0.50%, the balance being Fe and unavoidable impurities.
The production method of the steel plate comprises the following steps:
(1) Controlling a smelting process: smelting in an LF furnace to produce strong reducing slag by deoxidation, feeding 1.0kg/t steel of an aluminum wire, strengthening deoxidation, adding 7kg/t steel of lime and 2kg/t steel of fluorite, after smelting the slag, strongly stirring for 4min, and removing sulfur and impurities; white slag time is 25min, ladle skimming is carried out, and the slag amount is poured out by 50 percent, wherein the steel contains 0.06 percent of Si and 0.001 percent of P. The specification of the produced casting blank is 300 × 2400mm.
(2) Controlling a rolling process: when the steel plate is rolled, a two-section controlled rolling mode is adopted for rolling, the heating time coefficient before the casting blank is rolled is 2.5min/mm, the steel airing thickness is 165mm, the second-section rolling temperature is 816 ℃, and the temperature returns to 700 ℃ after the rolling.
(3) And (3) controlling a heat treatment process: the heat treatment method of the steel plate comprises quenching and tempering, the quenching temperature of the steel plate is 890 ℃, the total heating and heat preservation time is 5min, and 5000m is obtained after the quenching and heat preservation 3 Water cooling to room temperature; and a low-temperature short-time tempering process is adopted during tempering of the steel plate, the tempering temperature is 575 ℃, the total heat preservation time is 4min/mm, and the steel plate is taken out of the furnace and cooled in air after the heat preservation is finished to obtain a quenched and tempered steel plate.
The mechanical properties of the quenched and tempered steel plate produced in the embodiment are as follows: the yield strength is 520MPa, the tensile strength is 600MPa, and the central positions of the thickness of the steel plate are 250J, 284J and 266J of impact energy at the temperature of minus 40 ℃; the CTOD reached 0.46.
Example 6
The steel plate comprises the following chemical components in percentage by mass: c:0.09%, si:0.30%, mn:1.50 Percent, P:0.006%, S:0.002%, and Ni, cr, mo, nb, ni + Cr + Mo + Nb:0.70 percent, and the balance of Fe and inevitable impurities.
The production method of the steel plate comprises the following steps:
(1) Controlling a smelting process: manufacturing strong reducing slag by deoxidation in the refining process of an LF furnace, feeding 0.8kg/t steel of an aluminum wire, strengthening deoxidation, adding 5kg/t steel of lime and 4kg/t steel of fluorite, strongly stirring for 3min after the slag is manufactured, and removing sulfur and impurities; the white slag time is 30min, the ladle skips the slag, the amount of the slag is poured out by 35 percent, and at the moment, the content of Si in the steel is 0.04 percent and the content of P is 0.003 percent. The specification of the produced casting blank is 300 × 2400mm.
(2) Controlling a rolling process: when the steel plate is rolled, a two-section controlled rolling mode is adopted for rolling, the heating time coefficient before the casting blank is rolled is 2.3min/mm, the steel airing thickness is 165mm, the second-section rolling temperature is 825 ℃, and the temperature returns to 695 ℃ after rolling.
(3) And (3) controlling a heat treatment process: the heat treatment method of the steel plate comprises quenching and tempering, the quenching temperature of the steel plate is 910 ℃, the total heating and heat preservation time is 4min, and 4500m is obtained after the quenching and heat preservation are finished 3 Water cooling to room temperature; the steel plate adopts low-temperature short-time tempering during temperingThe process comprises the steps of tempering at 565 ℃, keeping the temperature for 2min/mm, and taking out of a furnace for air cooling after the heat preservation is finished to obtain a quenched and tempered steel plate.
The mechanical properties of the quenched and tempered steel plate produced in the embodiment are as follows: the yield strength is 507MPa, the tensile strength is 564MPa, and the impact energy at the center of the thickness of the steel plate is 277J, 259J and 264J at-40 ℃; the CTOD reached 0.54.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.

Claims (4)

1. The steel plate for the marine structure with high cracking resistance is characterized by being a quenched and tempered steel plate, and comprising the following chemical components in percentage by mass: c:0.06-0.09%, si:0.20-0.40%, mn:1.40-1.50%, P is less than or equal to 0.008%, S is less than or equal to 0.003%, and Ni, cr, mo, nb, ni + Cr + Mo + Nb:0.50-0.90%, and the balance of Fe and inevitable impurities;
the mechanical properties of the steel plate are as follows: the yield strength is 420-520MPa, the tensile strength is 540-640MPa, and the impact energy is more than or equal to 100J at the central position of the thickness of the steel plate at minus 40 ℃;
the CTOD value of the opening displacement of the crack tip of the steel plate is more than or equal to 0.46
The production method of the steel plate comprises the following steps:
(1) The smelting process comprises the following steps: deoxidizing to produce strong reducing slag in the refining process of the LF furnace;
(2) The rolling process comprises the following steps: when the steel plate is rolled, a two-section controlled rolling mode is adopted for rolling, the heating time coefficient before the casting blank is rolled is 2.2-2.5 min/mm, the rolling temperature in the second section is 800-850 ℃, and the temperature returns to 680-720 ℃ after rolling;
(3) The heat treatment process comprises the following steps: the heat treatment method of the steel plate comprises quenching and tempering, wherein the quenching temperature is 880-920 ℃, and the total heating and heat preservation time is 3-5min; tempering temperature is 560-580 ℃, total heat preservation time is 2-4min/mm, and discharging from the furnace for air cooling after heat preservation is finished.
2. The method for producing a steel plate for marine structures with high cracking resistance according to claim 1, wherein the method comprises the steps of:
(1) The smelting process comprises the following steps: deoxidizing to produce strong reducing slag in the refining process of the LF furnace;
(2) The rolling process comprises the following steps: when the steel plate is rolled, a two-section controlled rolling mode is adopted for rolling, the heating time coefficient before the casting blank is rolled is 2.2-2.5 min/mm, the rolling temperature in the second section is 800-850 ℃, and the temperature returns to 680-720 ℃ after rolling;
(3) The heat treatment process comprises the following steps: the heat treatment method of the steel plate comprises quenching and tempering, wherein the quenching temperature is 880-920 ℃, and the total heating and heat preservation time is 3-5min; tempering temperature is 560-580 ℃, total heat preservation time is 2-4min/mm, and discharging from the furnace for air cooling after heat preservation is finished.
3. The production method of the steel plate for the marine structure with high cracking resistance according to claim 2, wherein the smelting process in the step (1) is specifically as follows: feeding 0.5-1.0 kg/t steel of an aluminum wire in the refining process of an LF furnace, performing intensified deoxidation, adding 4-8 kg/t steel of lime and 2-5 kg/t steel of fluorite, after the slag is manufactured, forcibly stirring for 2-4min, and removing sulfur and impurities; the white slag time is more than or equal to 25min, the ladle skimming is carried out, the slag pouring amount is 30-50%, the Si in the steel is less than or equal to 0.06%, and the P content is less than or equal to 0.004%.
4. The method for producing the steel plate for marine structures with high cracking resistance according to claim 2, wherein 4500-5000m after quenching and heat preservation in step (3) are finished 3 Water is added to cool the mixture to room temperature.
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