CN113174537B - Large-thickness FH40 shipbuilding steel plate and manufacturing method thereof - Google Patents
Large-thickness FH40 shipbuilding steel plate and manufacturing 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/001—Heat treatment of ferrous alloys containing Ni
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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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
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
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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
- C21D2211/002—Bainite
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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 a large-thickness FH40 steel plate for shipbuilding with excellent aging impact toughness and a manufacturing method thereof. C: 0.07 percent to 0.12 percent; si: 0.05 to 0.14 percent; mn: 1.30% -1.60%; s: less than or equal to 0.002 percent; p: less than or equal to 0.008 percent; and (3) Als: 0.040% -0.055%; n: 0.003 to 0.015 percent; nb: 0.01 to 0.05 percent; ni: 0.25 to 0.55 percent; ti: 0.008 to 0.014 percent; the balance being Fe and unavoidable impurities. Can meet the technical requirements of severe and harsh ocean environments on the marine steel plate.
Description
Technical Field
The invention belongs to the field of steel material preparation, and particularly relates to a large-thickness FH40 steel plate with excellent aging impact toughness for shipbuilding and a manufacturing method thereof.
Background
In recent years, the demand for extremely low-grade steel for ships has rapidly increased year by year with the rapid growth of the ship industry. However, our country lacks the experience of designing and manufacturing vessels in polar regions, and has a great gap compared with the strong country of constructing vessels in polar regions such as finland, japan, korea, the united states and russia. In 2016, the construction of the polar condensation tanker of the russian Yamal project was internationally adopted by the wide-bodied vessel. In 2017, the largest maritime work enterprise in China collected riflescents to build a Weijing dragon north drilling platform ordered by Norway. Although the shipbuilding enterprises in China accept a small number of ship orders with low-grade ice region symbols, high-technology polar ships such as polar crude oil transportation icebreakers, polar LNG transportation icebreakers and the like are almost blank.
The polar region ship construction can not adapt to the low-temperature steel and other key materials of the polar region severe service environment, and the high-strength, high-low-temperature toughness and easily-welded high-performance steel is the basic guarantee for the safe navigation of the polar region ship. The development of steel plates with excellent comprehensive properties such as certain strength, lower yield ratio, good low-temperature toughness, lamellar tearing resistance, good weldability and processability is urgently needed.
Disclosure of Invention
In order to overcome the defects, the invention provides a large-thickness FH40 shipbuilding steel plate with excellent aging impact toughness and a manufacturing method thereof, through reasonable component design and novel TMCP process combination, the obtained steel plate has high strength and toughness in the whole thickness section, the prepared steel plate has high strength (yield strength is more than or equal to 400MPa, tensile strength is more than or equal to 550MPa), low temperature resistance (aging impact power is more than or equal to 160J at minus 60 ℃), Z-directional performance is more than or equal to 70%, the steel plate structure is a ferrite and bainite dual-phase structure, wherein the ferrite structure proportion is more than or equal to 75%, the maximum thickness is 100mm, the zero plastic brittle transition temperature (DNTT) is less than or equal to-65 ℃, the steel plate has the characteristics of good structural performance uniformity, lamellar tearing resistance and the like, and can meet the technical requirements of severe and severe ocean environments on the shipbuilding steel plate.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
the steel plate with the large thickness FH40 for shipbuilding is characterized in that the steel plate comprises the following chemical components in percentage by mass: c: 0.07 percent to 0.12 percent; si: 0.05 to 0.14 percent; mn: 1.30% -1.60%; s: less than or equal to 0.002%; p: less than or equal to 0.008 percent; and (3) Als: 0.040% -0.055%; n: 0.003 to 0.015 percent; nb: 0.01 to 0.05 percent; ni: 0.25 to 0.55 percent; ti: 0.008 to 0.014 percent; the balance being Fe and unavoidable impurities.
The thickness of the steel plate is 50-100 mm.
The mechanism of action of each alloy component in the steel is as follows:
c: the carbon element with a certain content can be matched with cooling control to ensure the obdurability index of the steel plate, so the C content is preferably controlled to be 0.07-0.12 percent from the aspects of economy and product performance.
Si: is a main deoxidizing component in the steel-making process, can be used as a deoxidizing agent and a reducing agent in the steel-making process, is beneficial to improving the strength of a steel plate, and promotes the formation of Maoelandia when the content exceeds 0.5 percent, thereby damaging the weldability and the low-temperature toughness. The proper amount of Si can improve the elastic limit, yield strength and yield ratio of the steel and can also improve the oxidation resistance of the steel at high temperature, and researches show that for the marine steel plate, the lower Si content can improve the surface quality of the steel plate, so that the Si content is preferably 0.05-0.14%.
Mn: is an essential element for ensuring the strength and the toughness of the steel, Mn is combined with S to form MnS, thereby avoiding thermal cracks caused by FeS formed at a grain boundary, and simultaneously Mn is also a good deoxidizer. Proper amount of manganese can improve the strength and toughness of steel, but too high amount of manganese causes winding segregation in casting blanks, thereby causing tissue banding which is difficult to eliminate after rolling and reducing the transverse performance and lamellar tearing resistance of the steel plate. In order to improve the toughness of the material of the present invention, the Mn content is preferably in the range of 1.30% to 1.60%.
P: the material is an element which brings adverse effects on an impact value, can be segregated in the central part of a slab, is aggregated in a crystal boundary and the like, and can damage low-temperature toughness, and the material is controlled to be not higher than 0.008%.
S: the material is an element which brings adverse effects on an impact value, can form sulfide inclusions to become a crack source, and is controlled to be not higher than 0.002%.
And Als: the deoxidation and grain refining elements which are essential to the invention are added in an amount of 0.01% or more, but if it exceeds 0.08%, the hot cracking of the cast slab is liable to occur, and the toughness of the steel is lowered. More preferably, the content is 0.040% to 0.055%.
Nb: the addition of Nb in the steel can effectively refine the grain size of the steel and improve the strength and toughness. The effect is not obvious when the addition amount is less than 0.01 percent; when the content is more than 0.05%, the toughness and weldability of the steel are reduced, so that the preferable content of Nb is controlled to be 0.01-0.05%.
Ni: the steel has the solid solution strengthening effect, can promote the alloy steel to form a stable austenite structure, has the characteristics of minimizing the Ar3 point and the increase of the carbon equivalent or the cold crack sensitivity coefficient Pcm, and can improve the strength and the toughness of the steel, so the Ni content is controlled to be 0.25 to 0.55 percent.
N: n is an element that bonds with elements such as Al, Ti, and Nb to form nitrides and makes the base material structure finer. In order to exert such effects, it is necessary to contain N at 0.002% or more, but excessive solid-solution N is a cause of deterioration in toughness of the HAZ, and the content of N element is controlled appropriately to be able to play a role of refining grains, so the content of N is in the range of 0.003% to 0.015%.
Ti: the component added to improve the toughness of steel and the toughness of weld zones functions as TiN, but if it exceeds 0.04%, large-grain TiN is easily formed and loses its effect, so the Ti content is preferably in the range of 0.008% to 0.014%.
A manufacturing method of a large-thickness FH40 shipbuilding steel plate comprises the following steps: billet smelting → billet heating → billet rolling → steel plate cooling → stacking and slow cooling → finished steel plate. The key point of the preparation is as follows:
1) the smelting process comprises the following steps: selecting smelting raw materials, wherein the raw materials mainly comprise molten iron or high-quality return steel, the content of elements such as P, S is as low as possible, smelting components are controlled according to target values, the content of residual elements is strictly controlled, the carbon equivalent is prevented from exceeding the upper limit, LF and RH refining furnaces are required to be treated for 20-40min respectively, the superheat degree of tundish molten steel is less than or equal to 30 ℃, the whole process is protected for casting, and A, B, C, D types of inclusions in the steel are required to meet the following requirements: the A class is less than or equal to 1.0, the B class is less than or equal to 1.0, the C class is less than or equal to 1.0, and the D class is less than or equal to 1.0.
2) A heating process: : the steel billet creatively proposes a novel low-temperature heating system, wherein the heating temperature is 1080-1140 ℃, the soaking temperature is 1050-1080 ℃, and the soaking time is 20-50 min.
3) The rolling process comprises the following steps: the method adopts a controlled rolling technology of austenite in a crystallization area and austenite out of the crystallization area, the initial rolling temperature is 1000-1050 ℃, the large reduction is ensured at each stage, the single-pass deformation rate is more than or equal to 15%, the second stage is a finish rolling stage, the single-pass deformation rate is more than or equal to 12%, the thickness of the intermediate blank steel plate to be heated is 2.0-3.0 times of the thickness of a finished steel plate, the initial rolling temperature is 720-750 ℃ at the second stage, and the final rolling temperature is 700-730 ℃, the original structure is refined by combining a large-deformation rolling process, the composition of a phase transformation structure, the uniform refining degree and the multiphase particle precipitation behavior are controlled and adjusted, the grain size uniformity on the full-thickness section of the large-thickness steel plate is obtained, and the uniformity of the strength, the low-temperature toughness and the strain aging resistance of the steel are improved.
4) And (3) a cooling process: the average cooling speed of the steel plate is 8-15 ℃/S, the open cooling temperature is 660-700 ℃, the final cooling temperature is 380-430 ℃, the cooling process is carried out by adopting an ACC laminar flow full-automatic controlled cooling mode, the whole process adopts the head and tail shielding control of the steel plate, and the performance uniformity of the steel plate at different positions is ensured.
5) Stacking and slow cooling process: and stacking the steel plate after controlled cooling for slow cooling for more than or equal to 24 hours to obtain a steel plate finished product.
The invention has the beneficial effects that:
1) the steel plate has reasonable chemical component design, less alloy content and lower steel plate cost, adopts low-P, S pure steel for smelting, improves the purity of steel, and ensures that the steel plate for the big-thickness FH40 shipbuilding has excellent low-temperature aging impact toughness;
2) the novel low-temperature heating process is creatively provided, the soaking temperature stage heat preservation time of the soaking thermometer is properly designed, the energy consumption is greatly reduced, the original austenite structure grain size of the steel plate is refined, the structure uniformity of the subsequent rolled steel plate is improved, and the strengthening and toughening of the steel plate are improved to provide a foundation;
3) by combining the controlled rolling and water cooling (TMCP) processes, the structure strengthening and toughening of the large-thickness FH40 steel plate for shipbuilding with good aging impact toughness, uniform thinning of phase change structure, shape and grain size control and higher size precision and surface quality control are realized;
4) the prepared large-thickness FH40 steel plate for shipbuilding has high strength (yield strength is more than or equal to 400MPa and tensile strength is more than or equal to 520MPa), low temperature resistance (ageing impact work at minus 60 ℃ is more than or equal to 160J), Z-direction performance is more than or equal to 70 percent, NDTT is more than or equal to minus 65 ℃, and the maximum thickness of the steel plate is 100mm, has good ageing impact toughness, and has the characteristics of good structural property uniformity, lamellar tearing resistance, good surface quality and the like, thereby meeting the technical requirements of severe and severe ocean environments on the steel plate for shipbuilding.
5) The microstructure of the steel plate mainly comprises ferrite and bainite tissues, wherein the grain size of the ferrite reaches 10-11 grades, and the content of the ferrite is 75% -85%.
Drawings
FIG. 1 is a photograph showing the prior austenite grain size of the steel sheet of example 1 of the steel of the present invention;
FIG. 2 is a photograph of the metallographic structure of a steel plate obtained as a result of working example 1 of a steel according to the invention.
Detailed Description
Specific embodiments are described below with reference to the accompanying drawings:
as can be seen from the metallographic structure of the example 1, the steel plate structure treated by the novel TMCP process is basically a ferrite and bainite structure, the original austenite and the finished steel plate structure of the steel plate have clear grain boundaries, and the grains are very fine (wherein the austenite grain size is 10.0 grade, and the ferrite grain size is 11.0 grade), so that the steel plate for shipbuilding with large thickness FH40 has good low-temperature aging impact toughness and higher strength level.
The chemical components of the large-thickness FH40 shipbuilding steel plate with excellent aging impact toughness are shown in table 1, the steel billet smelting process parameters are shown in table 2, the steel plate rolling method and the cooling process are shown in table 3, and the tensile and impact properties of the steel in the embodiment are shown in table 4.
TABLE 1 chemical composition of the steel of the examples of the invention
TABLE 2 smelting process of the present invention
TABLE 3 Rolling method of Steel according to the inventive example
TABLE 4 tensile and impact properties of inventive example steels
The embodiment shows that the chemical components are reasonably designed, the alloy content is low, the steel plate cost is low, low-P, S pure steel is adopted for smelting, the purity of steel is improved, and the steel plate for large-thickness FH40 shipbuilding has excellent low-temperature aging impact toughness; a novel low-temperature heating process is creatively provided, the soaking temperature stage heat preservation time of a soaking thermometer is properly designed, the energy consumption is greatly reduced, the original austenite structure grain size of the steel plate is refined, the structure uniformity of a subsequent rolled steel plate is improved, and the strengthening and toughening of the steel plate are improved to provide a foundation; by combining the controlled rolling and water cooling (TMCP) processes, the structure strengthening and toughening of the large-thickness FH40 steel plate for shipbuilding with good aging impact toughness, uniform thinning of phase change structure, shape and grain size control and higher size precision and surface quality control are realized; the microstructure of the steel plate mainly comprises ferrite and bainite tissues, wherein the grain size of the ferrite reaches 10-11 grades, and the content of the ferrite is 75% -85%;
in conclusion, the prepared steel plate for shipbuilding with large thickness FH40, which has high strength (yield strength is more than or equal to 400MPa and tensile strength is more than or equal to 520MPa), low temperature resistance (ageing impact work at minus 60 ℃ is more than or equal to 160J), Z-direction performance is more than or equal to 70 percent, NDTT is more than or equal to minus 65 ℃, and the maximum thickness of the steel plate is 100mm, has good ageing impact toughness, and has the characteristics of good structural property uniformity, lamellar tearing resistance, good surface quality and the like, thereby meeting the technical requirements of severe and severe ocean environments on the steel plate for shipbuilding.
Claims (7)
1. The utility model provides a large thickness FH40 steel sheet for shipbuilding which characterized in that: the steel plate comprises the following chemical components in percentage by mass: c: 0.11 to 0.12 percent; si: 0.11 to 0.14 percent; mn: 1.30% -1.60%; s: less than or equal to 0.002 percent; p: less than or equal to 0.008 percent; and Als: 0.040% -0.055%; n: 0.003 to 0.015 percent; nb: 0.030% -0.045%; ni: 0.50 to 0.55 percent; ti: 0.008 to 0.014 percent; the balance of Fe and inevitable impurities; the steel plate structure is a ferrite and bainite dual-phase structure, wherein the ferrite structure proportion is more than or equal to 75 percent; the manufacturing method of the large-thickness FH40 steel plate for shipbuilding comprises smelting, continuous casting, rolling and cooling, wherein a steel billet is heated before rolling at the heating temperature of 1080-1140 ℃, the soaking temperature of 1050-1080 ℃ and the soaking time of 20-50 min; the method comprises the following steps of (1) adopting a two-stage controlled rolling technology of an austenite recrystallization region and an austenite non-recrystallization region, wherein the rolling temperature of one stage is 1000-1050 ℃, the rolling temperature of each stage is guaranteed to be higher in reduction, the single-pass deformation rate is more than or equal to 15%, the thickness of an intermediate blank steel plate to be heated is 2.0-3.0 times of the thickness of a finished steel plate, the rolling temperature of two stages is 720-750 ℃, the single-pass deformation rate is more than or equal to 12%, and the final rolling temperature is 700-730 ℃; and cooling after rolling, wherein the average cooling speed of the steel plate is 8-15 ℃/s, the start cooling temperature is 660-700 ℃, and the final cooling temperature is 380-430 ℃.
2. A high thickness FH40 steel sheet for shipbuilding according to claim 1, characterized in that: the thickness of the steel plate is 50-100 mm.
3. A high thickness FH40 steel sheet for shipbuilding according to claim 1, characterized in that: the yield strength of the steel plate is more than or equal to 400MPa, and the tensile strength is more than or equal to 550 MPa.
4. A high thickness FH40 steel sheet for shipbuilding according to claim 1, characterized in that: the aging impact energy of the steel plate at-60 ℃ is more than or equal to 160J, and the Z-direction performance is more than or equal to 70%.
5. A high thickness FH40 steel sheet for shipbuilding according to claim 1, characterized in that: in the smelting process, molten steel needs to be treated in LF and RH refining furnaces for 20-40min respectively, the superheat degree of tundish molten steel is less than or equal to 30 ℃, the casting is protected in the whole process, and A, B, C, D types of inclusions in the steel need to meet the following requirements: class A is less than or equal to 1.0, class B is less than or equal to 1.0, class C is less than or equal to 1.0, and class D is less than or equal to 1.0.
6. A steel plate for shipbuilding with a large thickness FH40 according to claim 1, characterized in that: the continuous casting process adopts a soft reduction technology.
7. A high thickness FH40 steel sheet for shipbuilding according to claim 1, characterized in that: and stacking the steel plates after controlled cooling for slow cooling for more than or equal to 24 h.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101397626A (en) * | 2007-12-07 | 2009-04-01 | 江苏沙钢集团有限公司 | High intensity and high-toughness hot-rolled steel sheet and method for producing the same |
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