CN117512449A - Large-thickness TMCP (thermal mechanical control processing) state FH500 marine steel plate and manufacturing method thereof - Google Patents

Large-thickness TMCP (thermal mechanical control processing) state FH500 marine steel plate and manufacturing method thereof Download PDF

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Publication number
CN117512449A
CN117512449A CN202311349574.5A CN202311349574A CN117512449A CN 117512449 A CN117512449 A CN 117512449A CN 202311349574 A CN202311349574 A CN 202311349574A CN 117512449 A CN117512449 A CN 117512449A
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percent
rolling
equal
thickness
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伯飞虎
王光磊
李恒坤
张晓雪
汪晶洁
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Nanjing Iron and Steel Co Ltd
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Nanjing 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
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • 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
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • 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
    • 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
    • C21D2211/009—Pearlite

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

Abstract

The invention discloses a large-thickness TMCP state FH500 marine steel plate and a manufacturing method thereof, wherein the steel plate comprises the following chemical components in percentage by weight: c:0.04 to 0.09 percent, si:0.15 to 0.35 percent, mn:1.40 to 1.70 percent, P: less than or equal to 0.020%, S: less than or equal to 0.0020 percent, V: 0.020-0.050%, ni:0.20 to 1.00 percent, cr:0.10 to 0.50 percent, nb: 0.020-0.050%, alt:0.010 to 0.050 percent, ti: 0.005-0.020%, ca: 0.0005-0.0040%, N: less than or equal to 0.0050 percent, and the balance of Fe and unavoidable impurities. The yield strength of the steel plate is more than or equal to 550MPa, the tensile strength is more than or equal to 680MPa, and the average impact energy of the base metal at the temperature of minus 60 ℃ is more than 200J.

Description

Large-thickness TMCP (thermal mechanical control processing) state FH500 marine steel plate and manufacturing method thereof
Technical Field
The invention relates to a marine steel plate and a manufacturing method thereof, in particular to a large-thickness TMCP state FH500 marine steel plate and a manufacturing method thereof.
Background
The FH500 grade ship plate is widely applied to the fields of ships and ocean engineering, and can promote the upgrading and the updating of ship plate steel products, mainly because the ship plate steel has higher strength, better toughness, good low-temperature toughness, welding performance and corrosion resistance. Besides, the FH500 grade ship plate can also reduce the dead weight of the ship body, increase the unit load capacity and improve the navigational speed, and the use of the ship body structural steel can also increase the collision safety of the ship body and improve the capability of coping with emergencies. In order to meet the large-scale development requirements of ships and ocean platforms, a TMCP state FH500 marine steel plate with higher strength, larger thickness, excellent low temperature and high toughness is required to be developed under the control of certain production cost. In the prior art, CN 113584410A discloses a novel production method of a high-strength ultra-thick FH500 steel plate for ocean engineering, but the patent C, mo has higher content, which can lead to high carbon equivalent and affect the welding performance of subsequent products; the alloy element Mo is added, so that the production cost is greatly increased; CN 108517463A discloses a high-ductility FH 500-grade ship plate steel and a preparation method thereof, but the production thickness of the steel plate is only 19-30 mm, and the current requirements and practical use of the ship plate with large thickness cannot be met.
Disclosure of Invention
The invention aims to: the invention aims to provide an ultra-high strong thickness TMCP state FH500 marine steel plate with excellent low-temperature toughness; another object of the present invention is to provide a method for manufacturing a large-thickness TMCP-state FH500 marine steel sheet with low production cost.
The technical scheme is as follows: the large-thickness TMCP state FH500 marine steel plate comprises the following chemical components in percentage by weight: c:0.04 to 0.09 percent, si:0.15 to 0.35 percent, mn:1.40 to 1.70 percent, P: less than or equal to 0.020%, S: less than or equal to 0.0020 percent, V: 0.020-0.050%, ni:0.20 to 1.00 percent, cr:0.10 to 0.50 percent, nb: 0.020-0.050%, alt:0.010 to 0.050 percent, ti: 0.005-0.020%, ca: 0.0005-0.0040%, N: less than or equal to 0.0050 percent, and the balance of Fe and unavoidable impurities, and the intermediate-temperature transformation structure can be prepared by adopting an advanced TMCP process, thereby utilizing various means such as structure strengthening, grain refinement, carbonitride precipitation strengthening and the like.
Preferably, the steel plate comprises the following chemical components in percentage by weight: c:0.05 to 0.08 percent, si:0.16 to 0.20 percent, mn:1.50 to 1.68 percent, P: less than or equal to 0.020%, S: less than or equal to 0.0020 percent, V:0.032 to 0.040 percent, ni:0.50 to 0.75 percent, cr:0.29 to 0.34 percent, nb: 0.027-0.038%, alt:0.020 to 0.038 percent, ti: 0.012-0.017%, ca: 0.0005-0.0040%, N: less than or equal to 0.0050 percent, and the balance of Fe and unavoidable impurities.
The structure of the steel plate is mainly lath bainite, and also contains a small amount of ferrite and pearlite, so that the strength is ensured, and meanwhile, excellent low-temperature toughness is ensured.
The thickness of the steel plate is 60-120mm, the yield strength is 550-604 MPa, the tensile strength is 680-730 MPa, and the V-shaped transverse impact average value is above 200J.
The production method of the steel plate comprises the steps of molten iron pretreatment, converter smelting, LF refining, RH refining, continuous casting pouring, heating, rolling and cold piling.
Further, the production method firstly carries out pretreatment desulfurization of molten iron; then smelting in a converter, dephosphorizing by adopting a high-blowing low-pressure method, cleaning a water outlet without defects, tapping steel from the converter, and discharging slag; LF refining adopts white slag operation, the white slag holding time is more than or equal to 20 minutes, and the target alkalinity is controlled; the RH vacuum treatment holding time is more than or equal to 15 minutes, and the seamless calcium wire is fed into the furnace for 110 to 130 meters after the vacuum treatment; the continuous casting uses a five-hole nozzle, the target temperature of the tundish is 15-25 ℃ higher than the liquidus temperature, the pulling speed is stable, and a carbonless covering agent is adopted.
Further, the heating process includes: soaking the billet with the thickness of 320-460mm obtained in continuous casting and pouring at 1150-1250 ℃ for more than 64min, heating for 11-20 min/cm, and tapping at 1100-1170 ℃.
The rolling process comprises the following steps: and (3) performing two-stage controlled rolling on the heated casting blank, wherein the first stage is the rolling in a recrystallization zone, the rolling temperature is controlled to be 1050-1150 ℃ above the recrystallization critical temperature, the average single-pass reduction rate is more than or equal to 15%, and the accumulated reduction rate is 40-50%, so that austenite at the 1/4 and 1/2 thickness positions of the steel plate is recrystallized through deformation of the large reduction rate, and austenite grains are refined.
The subsequent intermediate blank is heated, the thickness of the intermediate blank is 2.0h less than the thickness less than 3.0h, the two-stage initial rolling temperature is 700-800 ℃, and the final rolling temperature is 700-800 ℃, so that the effective area of austenite grain boundaries is increased, more nucleation points are provided for austenite transformation, and the effect of grain refinement is achieved. After rolling, the steel plate enters ACC for cooling, the reddening temperature is controlled between 300 ℃ and 400 ℃, the growth of crystal grains in the rolled steel plate can be avoided, the impact toughness is influenced, and the steel plate is ensured to have good toughness.
The beneficial effects are that: compared with the prior art, the invention has the following remarkable advantages: the TMCP state FH500 marine steel plate has the yield strength of more than or equal to 550MPa, the tensile strength of more than or equal to 680MPa, the average impact energy of the base metal at the temperature of minus 60 ℃ of more than 200J, and excellent low-temperature resistance toughness; the invention optimizes the chemical components of the high-strength steel plate, adopts an advanced TMCP process, controls the rolling and cooling process to control the microstructure and the grain size in the plate thickness direction, and obtains the steel plate with excellent low-temperature toughness, larger thickness and ultra-high strength; meanwhile, precious metals are avoided in the chemical components of the steel plate as much as possible, and the production cost is low.
Detailed Description
The technical scheme of the invention is further described below by referring to examples.
Table 1 shows chemical components of example steels, table 2 shows a production method of example steels, and table 3 shows mechanical properties of example steels.
TABLE 1 chemical composition (wt%) in the examples of the invention
TABLE 2 preparation method of example steel of the present invention
TABLE 3 mechanical Properties of the inventive example Steel

Claims (10)

1. A large-thickness TMCP state FH500 marine steel plate comprises the following chemical components in percentage by weight: c:0.04 to 0.09 percent, si:0.15 to 0.35 percent, mn:1.40 to 1.70 percent, P: less than or equal to 0.020%, S: less than or equal to 0.0020 percent, V: 0.020-0.050%, ni:0.20 to 1.00 percent, cr:0.10 to 0.50 percent, nb: 0.020-0.050%, alt:0.010 to 0.050 percent, ti: 0.005-0.020%, ca: 0.0005-0.0040%, N: less than or equal to 0.0050 percent, and the balance of Fe and unavoidable impurities, wherein the thickness of the steel plate is 60-120mm, and the marine steel plate is prepared by adopting a TMCP process.
2. The large-thickness TMCP state FH500 marine steel sheet according to claim 1, wherein the steel sheet comprises the following chemical components in percentage by weight: c:0.05 to 0.08 percent, si:0.16 to 0.20 percent, mn:1.50 to 1.68 percent, P: less than or equal to 0.020%, S: less than or equal to 0.0020 percent, V:0.032 to 0.040 percent, ni:0.50 to 0.75 percent, cr:0.29 to 0.34 percent, nb: 0.027-0.038%, alt:0.020 to 0.038 percent, ti: 0.012-0.017%, ca: 0.0005-0.0040%, N: less than or equal to 0.0050 percent, and the balance of Fe and unavoidable impurities.
3. The large-thickness TMCP state FH500 marine steel sheet according to claim 1, wherein: the yield strength is more than or equal to 550MPa, and the tensile strength is more than or equal to 680MPa.
4. A method for manufacturing a large-thickness TMCP state FH500 marine steel sheet according to any one of claims 1 to 3, comprising the steps of:
steelmaking and continuous casting processes: firstly, carrying out pretreatment desulfurization on molten iron; then smelting in a converter, dephosphorizing by adopting a high-blowing low-pressure method, cleaning a water outlet without defects, tapping steel from the converter, and discharging slag; LF refining adopts white slag operation, the white slag holding time is more than or equal to 20 minutes, and the target alkalinity is controlled; the RH vacuum treatment holding time is more than or equal to 15 minutes, and the seamless calcium wire is fed into the furnace for 110 to 130 meters after the vacuum treatment; a five-hole nozzle is used for continuous casting, the target temperature of a tundish is 15-25 ℃ higher than the liquidus temperature, the pulling speed is stable, and a carbonless covering agent is adopted;
the rolling process comprises the following steps: adopting a controlled rolling and cooling process, and rolling in two stages; adopting a controlled rolling and cooling process, wherein the heating temperature before rolling is 1150-1250 ℃, the initial rolling temperature of rough rolling is 1050-1150 ℃, the rough rolling is performed to obtain an intermediate billet with the thickness less than 2.0h and the finished product thickness less than 3.0h, the initial rolling temperature of finish rolling is 700-800 ℃, and the final rolling temperature of finish rolling is 700-800 ℃.
5. The method for producing a large thickness TMCP state FH500 marine steel plate according to claim 4, wherein N is less than or equal to 40ppm and H is less than or equal to 1.5ppm after the vacuum treatment.
6. The method for manufacturing a large thickness TMCP state FH500 marine steel sheet according to claim 4, wherein said finish rolling total pass is not more than 10 passes.
7. The method for manufacturing a large-thickness TMCP state FH500 marine steel sheet according to claim 4, wherein said post-rolling controlled cooling is performed by accelerated cooling with a large amount of water, and the reddening temperature is 300 to 400 ℃, followed by air cooling.
8. The method for manufacturing a large-thickness TMCP state FH500 marine steel plate according to claim 4, wherein in the heating process, the soaking temperature of the steel billet with the thickness of 320-460mm obtained in continuous casting pouring is 1150-1250 ℃, the soaking time is more than 64min, the overall heating time is 11-20 min/cm, and the tapping temperature is 1100-1170 ℃.
9. The method for manufacturing a large-thickness TMCP state FH500 marine steel plate as claimed in claim 4, wherein the first stage of the rolling process is recrystallization zone rolling, the rolling temperature is controlled to be 1050-1150 ℃ above the recrystallization critical temperature, the average single pass reduction is not less than 15%, and the cumulative reduction is 40% -50%.
10. The method for manufacturing a large-thickness TMCP-state FH500 marine steel sheet according to claim 4, wherein the rolling process is performed at a two-stage rolling temperature ranging from 700 to 800 ℃ and a finishing temperature ranging from 700 to 800 ℃ to increase the effective area of austenite grain boundaries.
CN202311349574.5A 2023-10-18 2023-10-18 Large-thickness TMCP (thermal mechanical control processing) state FH500 marine steel plate and manufacturing method thereof Pending CN117512449A (en)

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