CN116200682B - High-strength high-toughness low Wen Haigong steel plate and manufacturing method thereof - Google Patents

High-strength high-toughness low Wen Haigong steel plate and manufacturing method thereof Download PDF

Info

Publication number
CN116200682B
CN116200682B CN202211610358.7A CN202211610358A CN116200682B CN 116200682 B CN116200682 B CN 116200682B CN 202211610358 A CN202211610358 A CN 202211610358A CN 116200682 B CN116200682 B CN 116200682B
Authority
CN
China
Prior art keywords
temperature
steel plate
rolling
low
strength
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202211610358.7A
Other languages
Chinese (zh)
Other versions
CN116200682A (en
Inventor
朱隆浩
王�华
赵坦
金耀辉
李家安
于浩男
陈华
应传涛
黄松
李新玲
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Angang Steel Co Ltd
Original Assignee
Angang Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Angang Steel Co Ltd filed Critical Angang Steel Co Ltd
Priority to CN202211610358.7A priority Critical patent/CN116200682B/en
Publication of CN116200682A publication Critical patent/CN116200682A/en
Application granted granted Critical
Publication of CN116200682B publication Critical patent/CN116200682B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Landscapes

  • 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 provides a high-strength high-toughness low Wen Haigong steel plate and a manufacturing method thereof, wherein the steel plate comprises the following components in percentage by weight ：C:0.085％-0.13％,Si:0.16％-0.4％,Mn:0.8％-1.4％,P≤0.02％,S≤0.01％,Als：0.02％-0.04％,Ni：3.2％-4.5％,Cr:0.3％-0.7％,Mo:0.3％-0.6％,Cu:0.4％-0.7％,Nb:0.01％-0.04％,V:0.1％-0.25％,N:0.003％-0.006％,, and the balance of Fe and unavoidable impurities. The production method of the steel plate comprises smelting, casting, low-temperature heating, controlled rolling, controlled cooling and low-temperature tempering. The yield strength of the marine steel plate is more than or equal to 690MPa, the tensile strength is 770-940MPa, the elongation is more than or equal to 16%, the Charpy impact energy at-80 ℃ is more than or equal to 70J, and the thickness is less than or equal to 60mm.

Description

High-strength high-toughness low Wen Haigong steel plate and manufacturing method thereof
[ Field of technology ]
The invention belongs to the field of steel material preparation, and particularly relates to a component design of a high-strength high-toughness low Wen Haigong steel plate and a manufacturing method thereof.
[ Background Art ]
The 21 st century is the century of the ocean, and along with the development of technology and the improvement of the living standard of people, the world countries focus the eyes on huge resources stored in the ocean. In recent years, the continuous and rapid development of the marine industry promotes the mass demand of marine steel and the upgrading and updating of products, and the market is in urgent need of high-strength ultra-thick ultra-low-temperature toughness marine steel plates with good comprehensive properties.
With the progressive exhaustion of conventional oil and gas producible energy, the rich energy reserves in arctic regions are receiving more and more attention. Investigation by the united states geological survey has shown that oil, gas and lng reserves in the northern circle reach 900, 47 and 440 trillion cubic meters, respectively, accounting for about 22% of the total amount of unexplored energy worldwide. Meanwhile, the global greenhouse effect aggravates the arctic temperature rise, the sea ice coverage area is continuously and rapidly reduced, and resource development and ship navigation are more and more facilitated. In recent years, the exploration and development of oil and gas in North America has been significantly accelerated in Russian and Nordic countries. The energy sources and trade route potential in arctic regions are paid more attention to, the requirements and development of large-scale high-technology polar marine equipment are promoted, higher requirements are put on the polar marine ultra-low temperature steel with the temperature of-80 ℃ for meeting polar service conditions, and the high-strength grade polar low Wen Haigong steel with excellent low-temperature toughness and weldability is a development trend.
Besides the conventional stress, the ocean engineering platform has a severe service environment, and is influenced by various factors such as strong wind, surge, tide, ice block impact, earthquake and the like, so that the specificity of the steel for the ocean platform is determined, and the ocean engineering platform must be suitable for various sea conditions in the aspect of material selection of platform construction. Meanwhile, the steel plate is in a humid and high-salinity marine environment for a long time, and is subjected to the problems of paint film falling, corrosion and corrosion fatigue on the surface of the steel plate and the like caused by adhesion of humid air, seawater and marine organisms, so that the mechanical property of the steel plate is reduced, the service life is shortened, and the normal use of an ocean engineering platform is seriously influenced. In addition, ocean platforms are far away from the coast and cannot be regularly docked for maintenance as ships do. In order to enable the ocean engineering platform to be safely used in extremely cold complex environments such as polar regions, development of high-quality ocean engineering ultra-high strength steel with excellent comprehensive performance is urgently needed, and the ocean engineering ultra-high strength steel plate needs to have the advantages of high strength, ultra-low temperature toughness and the like in low-temperature environments.
At present, the steel for ocean engineering can meet most of the demands of the market in the field of marine engineering, but special steel with ductile-brittle transition temperature lower than-80 ℃ and maximum thickness of 60mm and excellent comprehensive performance is still a development target of various countries in the world, and the high-strength steel plate with high service safety has high difficulty in scientific research, strict production process, high requirement on equipment and high development difficulty. The patent with publication number CN102586683B discloses a Ni-based low-temperature steel plate, a manufacturing method thereof, a liquefied natural gas storage tank and a ship body for a transport ship, and the invention adopts a high-Ni high-Cu component system, improves impact toughness and only can produce a steel plate with thin specification. Patent CN111373066a, ultra low temperature steel and its manufacturing method, proposes an ultra low temperature steel, which adopts alloy composition design of adding only high Ni, only can produce 10-45mm steel plate, and the composition process can not guarantee the toughness of the steel plate with the increase of the thickness of the steel plate.
[ Invention ]
Aiming at the defects of the prior art, the invention aims to provide a high-strength high-toughness low Wen Haigong steel plate suitable for the field of ocean engineering, and the mechanical property and the high service safety performance of the steel plate can reach the service condition of ocean engineering equipment with the polar region of-80 ℃, and the impact energy at-80 ℃ is more than or equal to 70J.
The invention aims at realizing the following steps:
a high-strength high-toughness low Wen Haigong steel plate comprises the following components ：C:0.085％-0.13％,Si:0.16％-0.4％,Mn:0.8％-1.4％,P≤0.02％,S≤0.01％,Als：0.02％-0.04％,Ni：3.2％-4.5％,Cr:0.3％-0.7％,Mo:0.3％-0.6％,Cu:0.4％-0.7％,Nb:0.01％-0.04％,V:0.1％-0.25％,N:0.003％-0.006％, by weight percent, and the balance of Fe and unavoidable impurities.
Further, the yield strength of the steel plate is more than or equal to 690MPa, the tensile strength is 770-940MPa, the elongation is more than or equal to 16%, and the Charpy impact energy at minus 80 ℃ is more than or equal to 70J;
Further, the thickness of the steel plate is less than or equal to 60mm;
further, the steel plate structure is ferrite and granular bainite, and the volume content of the ferrite is less than or equal to 10%.
The reason for designing the components of the invention is as follows:
1) C is used as a basic strengthening element in steel, is a main element for ensuring strength and hardness in the scheme of the invention, and the excessive content of C can generate a large amount of hardening tissues to influence the low-temperature impact toughness and the welding performance. Too low a C content results in a decrease in strength of the steel sheet. The content of C is 0.085% -0.13%.
2) Si can improve the strength of the steel plate, and meanwhile, the Si is taken as a deoxidizer to reduce the O content, but the invention adopts Al deoxidization to reduce the Si element content, and when the Si content is lower than 0.4%, the low-temperature toughness of the steel plate can be prevented from being reduced, and the Si content is 0.16-0.4%.
3) Mn element and Fe element have similar atomic radius, and can be dissolved in Fe matrix in large quantity, so that the strength of the steel plate is improved. Meanwhile, mn element enlarges an austenite phase region, can refine the grain structure of the steel plate, improves the low-temperature impact toughness of the steel plate, properly improves the combined action of Mn element and Ni element, and further reduces the ductile-brittle transition temperature of the steel plate; when the mass percentage of Mn element is more than 1.4%, the segregation of Mn element can lead the low-temperature toughness of the thick plate core to be poor, and the Mn content is 0.8-1.4%.
4) The P, S element has no benefit on the mechanical property of the steel plate, particularly the elongation, and the P is controlled to be less than or equal to 0.02 percent and the S is controlled to be less than or equal to 0.01 percent.
5) Al is a main deoxidizing element in steel, when the Al content is too low, the deoxidizing effect is poor, micro-alloy elements such as Ti and the like cannot be used for refining grains due to oxidization, and the ultra-high strength steel plate with larger thickness needs to properly improve the Als content in the steel; conversely, if the Al element is too high, large-sized inclusions are formed, and the Als content is 0.02% -0.04%.
6) The Ni element can greatly improve the toughness and hot workability of the steel sheet. The addition of a large amount of Ni can improve the hot cracking tendency of Cu in steel, and the toughness of the steel plate can be further improved under the combined action of the Ni and the strength of V, nb and other microalloy. The Ni content is 3.2% -4.5%.
7) The Cr element can effectively improve the strength of the steel plate, reduce the yield ratio of the steel plate, and properly add the Cr element to improve the cooling control effect of the steel plate; however, excessive Cr content can generate a large amount of Cr carbide, so that the impact toughness of the steel plate is reduced, and the Cr content is 0.3-0.7%.
8) The Mo element can improve the hardenability of the steel plate, and meanwhile, the Mo element can form tiny carbide in the steel, so that the strength of the steel plate can be effectively improved, and based on the alloy system, the low-temperature toughness of the steel plate cannot be obviously reduced by less than 0.6 percent, and the Mo content is 0.3-0.6 percent.
9) The Cu element can improve the strength of the steel plate, and can improve the low-temperature toughness of the steel plate by coaction with Ni and Cr elements; however, too high Cu content can obviously reduce the toughness of the steel plate and improve the high-temperature hot cracking property of the steel plate. Cu content is 0.4% -0.7%.
10 The micro-addition of Nb can obviously improve the toughness of the steel plate, refine grains, reduce the overheat sensitivity and the tempering brittleness of the steel plate, is particularly suitable for being added in the alloy system of the invention, and can further improve the impact toughness of the steel plate at-80 ℃ by matching with low-temperature controlled rolling and tempering heat treatment, and the Nb content is 0.01-0.04%.
11 V element is an important alloy element in the steel plate of the steel plate, and the V element can refine structural grains and improve the toughness of the steel plate. V element and C, N form V (C, N) particles in the matrix, which can play the roles of refining and strengthening grains. V element is added into the tempered steel plate, so that the toughness and the elongation of the steel plate can be obviously improved. The too high V element can cause the reduction of the surface quality of the steel plate, tiny cracks appear below the surface of the steel plate, the toughness of the steel plate is reduced, and the welding performance is reduced. The V content is 0.1% -0.25%.
12 N element can be matched with Nb and V elements to form a fine dispersed N-compound precipitated phase, which can effectively promote the growth of ferrite cores in the grains and effectively control the growth of original austenite grains. However, when the content of solid-solution N is too large, the steel has low thermoplasticity, the toughness of the steel sheet is lowered, and a large number of microcracks are likely to occur on the surface of the steel sheet. Therefore, the N content is 0.003% -0.006%.
The second technical scheme of the invention is to provide a manufacturing method of the high-strength high-toughness low Wen Haigong steel plate, which comprises smelting, casting, low-temperature heating, controlled rolling, controlled cooling and low-temperature tempering.
Smelting: refining the molten steel by a converter, an LF furnace and an RH furnace (or a VD furnace), and further reducing P, S and nonmetallic inclusion contents.
Casting: the superheat degree of the ladle molten steel is 20-30 ℃. Die casting or continuous casting, the drawing speed of the continuous casting billet is less than or equal to 1.0m/min, and the slow cooling of the steel billet is less than or equal to 72h.
Heating at low temperature:
The casting blank is put into a heating furnace at the furnace temperature of 500-700 ℃ to ensure that the temperature of the steel blank in the thickness direction is kept consistent in the low-temperature stage, and the preparation is made for the uniform structure of the high-temperature stage. The temperature rising rate of the casting blank in the subsequent temperature rising process is controlled to be 3.5-5 ℃/min, so that uneven heating of the inside of the steel blank caused by over-fast heating of the steel blank is avoided. The soaking temperature is 1230-1280 ℃ for 60-120min, and the aim of soaking at low temperature is to avoid abnormal growth of the as-cast structure while ensuring the sufficient dissolution of C/N compounds.
And (3) rolling control:
The initial rolling temperature of the rough rolling stage is 1050-1150 ℃, the average pass rolling reduction of the rough rolling stage is 8-12%, and the accumulated rolling reduction of the rough rolling stage is 40-55%. The purpose of the rough rolling stage requiring the average pass rolling reduction and the accumulated rolling reduction is to increase the single pass rolling reduction as much as possible in the stage with lower deformation resistance, and improve the as-cast structure of the slab.
The initial rolling temperature of the finish rolling stage is 900-1000 ℃, the average rolling reduction rate of the last three passes of the finish rolling stage is 5-10%, and the final rolling temperature is 800-900 ℃. The design of the last three rolling processes aims to increase the deformation of the core of the steel plate by utilizing more surface temperature drop, improve the grain size of the core of the steel plate and promote the flattening and the miniaturization of austenite grains. As ferrite is nucleated on the austenite grain boundaries, the effect of grain refinement can be achieved by increasing the area of the austenite grain boundaries, and the single-pass reduction rate of the last three passes at the temperature close to the finish rolling temperature is most important for grain refinement. By subjecting austenite to recrystallization rolling and relaxation in the critical temperature range, the austenite structure can be refined, providing for the final structure refinement.
And (3) controlling cooling:
The water inlet temperature is 720-800 ℃, the redback temperature is 400-500 ℃, the relaxation time is 1.5-5min, and the steel plate with granular bainite and ferrite with volume content less than or equal to 10% can be obtained by adopting the relaxation and cooling control processes.
Low temperature tempering:
The tempering temperature is 400-500 ℃, and the tempering and heat preserving time is 100-260min. The tempering can adjust the quality of the precipitated second phase while adjusting the matrix structure, the strength and hardness of the steel plate are reduced, the toughness and plasticity are improved, and the tempering at 400-500 ℃ can enable the tempering transformation products to be transformed as much as possible.
The high-strength high-toughness low Wen Haigong steel plate produced according to the scheme has the following beneficial effects:
1. by combining C, mn, ni, cr, mo, cu, V, nb elements matched and combined design and key production technology of the large-thickness ultra-high-strength low-temperature toughness marine steel plate, the ultra-high-strength marine steel with the maximum thickness of 60mm can be produced.
2. The innovative alloy component system can ensure that the yield strength of the steel plate after quenching and tempering is more than or equal to 690MPa, the tensile strength is 770-940MPa, the elongation is more than or equal to 16 percent, and the Charpy impact energy at minus 80 ℃ is more than or equal to 70J.
[ Description of the drawings ]
FIG. 1 is a microstructure of example 1 of the present invention.
[ Detailed description ] of the invention
Aiming at the component performance requirements of the extremely-cold marine environment at-80 ℃ on the high-strength marine steel, by utilizing the component design of C, mn, ni, cr, cu, mo matched with a large amount of Nb and V elements and the key production technology of the extremely-cold environment-resistant marine steel plate, the inventor performs a large number of systematic experimental researches on the aspects of alloy element screening and proportioning, steel cleanliness control, high-efficiency rolling process optimization, parameter selection and the like, and finally determines the alloy element proportioning and rolling heat treatment process capable of meeting the purposes.
The invention is further illustrated by the following examples.
According to the technical scheme, the embodiment of the invention comprises the following steps of smelting, casting, low-temperature heating, controlled rolling, controlled cooling and low-temperature tempering.
Heating at low temperature: the casting blank is put into a heating furnace at the furnace temperature of 500-700 ℃, the heating rate is controlled at 3.5-5 ℃/min, and the soaking temperature is 1230-1280 ℃ and the temperature is kept for 60-120min.
And (3) rolling control: the initial rolling temperature of the rough rolling stage is 1050-1150 ℃, the average pass rolling reduction of the rough rolling stage is 8-12%, and the accumulated rolling reduction of the rough rolling stage is 40-55%. The initial rolling temperature of the finish rolling stage is 900-1000 ℃, the average rolling reduction rate of the last three passes of the finish rolling stage is 5-10%, and the final rolling temperature is 800-900 ℃.
And (3) controlling cooling: the water inlet temperature is 720-800 ℃, the redback temperature is 400-500 ℃, the relaxation time is 1.5-5min, and the steel plate with granular bainite and ferrite with volume content less than or equal to 10% is obtained by adopting the relaxation and controlled cooling processes.
Low temperature tempering: the tempering temperature is 400-500 ℃, and the tempering and heat preserving time is 100-260min.
Further, the casting is die casting or continuous casting, and the superheat degree of the ladle molten steel is 20-30 ℃. The continuous casting blank drawing speed is less than or equal to 1.0m/min, and the slow cooling of the steel blank in the lower line is more than or equal to 72 hours.
The chemical compositions of the examples of the present invention are shown in Table 1, the preparation methods are shown in Table 2, and the tensile and transverse impact properties are shown in Table 3.
TABLE 1 chemical composition (wt%) in the examples of the invention
Composition of the components C Si Mn P S Als Ni Cr Mo Cu Nb V N
1 0.093 0.16 1.35 0.014 0.005 0.032 4.49 0.33 0.41 0.58 0.029 0.22 0.0042
2 0.086 0.22 0.83 0.011 0.007 0.028 3.52 0.59 0.57 0.64 0.034 0.17 0.0051
3 0.085 0.26 1.22 0.02 0.01 0.021 3.89 0.44 0.36 0.41 0.011 0.12 0.0048
4 0.091 0.37 1.13 0.01 0.004 0.031 3.21 0.31 0.45 0.67 0.039 0.23 0.0036
5 0.099 0.19 1.09 0.019 0.007 0.029 3.86 0.59 0.52 0.53 0.014 0.16 0.0031
6 0.096 0.17 1.18 0.02 0.006 0.033 3.46 0.47 0.31 0.44 0.032 0.11 0.0059
7 0.104 0.28 0.94 0.012 0.008 0.027 4.19 0.31 0.52 0.63 0.04 0.1 0.0043
8 0.114 0.24 0.88 0.011 0.01 0.033 4.03 0.64 0.48 0.49 0.023 0.24 0.0055
9 0.109 0.4 1.03 0.016 0.01 0.037 3.29 0.38 0.39 0.51 0.027 0.25 0.0032
10 0.112 0.31 1.37 0.013 0.008 0.024 3.97 0.48 0.59 0.69 0.038 0.15 0.0041
11 0.117 0.23 0.85 0.02 0.007 0.028 4.06 0.33 0.41 0.49 0.016 0.21 0.0038
12 0.118 0.18 0.97 0.017 0.009 0.023 3.74 0.69 0.55 0.43 0.019 0.13 0.0047
13 0.107 0.38 1.19 0.011 0.005 0.039 3.23 0.49 0.34 0.56 0.022 0.24 0.0032
14 0.097 0.32 0.92 0.012 0.008 0.031 4.45 0.32 0.48 0.52 0.038 0.11 0.0055
15 0.092 0.28 1.19 0.009 0.01 0.024 3.38 0.58 0.39 0.63 0.023 0.18 0.006
16 0.127 0.18 1.4 0.018 0.004 0.028 3.87 0.64 0.54 0.69 0.035 0.22 0.0054
17 0.122 0.26 1.34 0.016 0.009 0.021 3.29 0.39 0.33 0.42 0.012 0.24 0.0044
18 0.125 0.39 0.94 0.01 0.008 0.039 3.98 0.37 0.39 0.59 0.028 0.16 0.0054
19 0.128 0.3 0.81 0.013 0.007 0.035 4.38 0.69 0.59 0.47 0.032 0.12 0.0034
20 0.129 0.21 1.05 0.018 0.005 0.026 4.22 0.52 0.37 0.54 0.037 0.19 0.0057
TABLE 3 mechanical properties of the steel sheet of the example of the invention
As is apparent from the above, the yield strength of the steel plate obtained by the invention is more than or equal to 690MPa, the tensile strength is 770-940MPa, the elongation is more than or equal to 16%, the Charpy impact energy at-80 ℃ is more than or equal to 70J, and the maximum thickness is 60mm.
The present invention has been properly and fully described in the foregoing embodiments by way of example only, and not by way of limitation, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, any modification, equivalent substitution, improvement, etc. should be included in the scope of the invention, and the scope of the invention is defined by the claims.

Claims (5)

1. The high-strength high-toughness low Wen Haigong steel plate is characterized by comprising the following components ：C:0.085%-0.13%,Si:0.31%-0.4%,Mn:0.81%-1.4%,P≤0.02%,S≤0.01%,Als：0.021%-0.04%,Ni：3.2%-4.49%,Cr:0.3%-0.49%,Mo:0.3%-0.48%,Cu:0.51%-0.7%,Nb:0.01%-0.04%,V:0.1%-0.25%,N:0.003%-0.006%, in percentage by weight, wherein the balance of Fe and unavoidable impurities; the steel plate structure is ferrite and granular bainite, wherein the volume content of the ferrite is less than or equal to 10%;
The manufacturing method of the high-strength high-toughness low Wen Haigong steel plate comprises high-cleanliness and alloying smelting, casting, low-temperature heating, controlled rolling, controlled cooling and low-temperature tempering,
Low temperature heating
The casting blank is fed into the furnace at 500-700 ℃, the heating rate is controlled at 3.5-5 ℃/min in the heating process, the soaking temperature is 1230-1280 ℃, and the temperature is kept for 60-120min;
Controlled rolling
The initial rolling temperature of rough rolling is 1050-1150 ℃, the average pass rolling reduction rate of rough rolling is 8-12%, and the accumulated rolling reduction rate of rough rolling is 40-55%; the initial rolling temperature of the finish rolling is 900-1000 ℃, the average rolling reduction rate of the last three times of finish rolling is 5-10%, and the final rolling temperature is 800-900 ℃;
Controlled cooling
The water inlet temperature is 720-800 ℃, the redback temperature is 400-500 ℃, and the relaxation time is 1.5-5min;
Low temperature tempering
The tempering temperature is 400-500 ℃, and the tempering and heat preserving time is 100-260min.
2. The high-strength high-toughness low Wen Haigong steel sheet according to claim 1, wherein the steel sheet has a yield strength of not less than 690MPa, a tensile strength of 770-940MPa, an elongation of not less than 16%, and a charpy impact energy of not less than 70J at-80 ℃.
3. The high strength, high toughness, low Wen Haigong steel sheet according to claim 1, wherein said steel sheet has a thickness of 60mm or less.
4. The high-strength high-toughness low Wen Haigong steel plate according to claim 1, wherein the casting is full-process protection casting, and the superheat degree of the ladle molten steel is 20-30 ℃.
5. The high-strength high-toughness low Wen Haigong steel plate according to claim 1, wherein the casting is die casting or continuous casting, the billet drawing speed is less than or equal to 1.0m/min, and the billet off-line slow cooling is more than or equal to 72h.
CN202211610358.7A 2022-12-14 2022-12-14 High-strength high-toughness low Wen Haigong steel plate and manufacturing method thereof Active CN116200682B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211610358.7A CN116200682B (en) 2022-12-14 2022-12-14 High-strength high-toughness low Wen Haigong steel plate and manufacturing method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211610358.7A CN116200682B (en) 2022-12-14 2022-12-14 High-strength high-toughness low Wen Haigong steel plate and manufacturing method thereof

Publications (2)

Publication Number Publication Date
CN116200682A CN116200682A (en) 2023-06-02
CN116200682B true CN116200682B (en) 2024-04-16

Family

ID=86506751

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211610358.7A Active CN116200682B (en) 2022-12-14 2022-12-14 High-strength high-toughness low Wen Haigong steel plate and manufacturing method thereof

Country Status (1)

Country Link
CN (1) CN116200682B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116875903A (en) * 2023-07-24 2023-10-13 鞍钢股份有限公司 690 MPa-grade steel plate with excellent low-temperature ductility and manufacturing method

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20106275A0 (en) * 2010-12-02 2010-12-02 Rautaruukki Oyj Ultra high strength structural steel and a process for producing ultra high strength structural steel
KR20120072499A (en) * 2010-12-24 2012-07-04 주식회사 포스코 Precipitation hardening typed die steel with excellent hardness and toughness, and manufacturing method thereof
CN105648324A (en) * 2016-01-16 2016-06-08 舞阳钢铁有限责任公司 Large-thickness rack steel plate and production method thereof
CN108603258A (en) * 2016-05-31 2018-09-28 新日铁住金株式会社 The high-strength steel sheet of excellent in low temperature toughness
CN108998615A (en) * 2018-09-13 2018-12-14 武汉钢铁有限公司 A kind of 600MPa grades of offshore engineering structure steel and production method with excellent wear
CN112251670A (en) * 2020-09-30 2021-01-22 鞍钢股份有限公司 690 MPa-grade steel plate with good extensibility and manufacturing method thereof
CN113355583A (en) * 2021-06-07 2021-09-07 东北大学 Manufacturing method of ocean engineering steel with high strength and high toughness
CN113846270A (en) * 2021-09-29 2021-12-28 南阳汉冶特钢有限公司 Production method of extra-thick ultrahigh-strength SX690DZ35 steel plate
CN115341152A (en) * 2022-08-31 2022-11-15 鞍钢股份有限公司 Nickel-saving type-100 ℃ low-temperature steel and manufacturing method thereof

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220025474A1 (en) * 2020-12-22 2022-01-27 Northeastern University 785 MPa LEVEL EXTRA-THICK QUENCHED AND TEMPERED RACK STEEL PLATE FOR OFFSHORE PLATFORMS AND PREPARATION METHOD THEREFOR

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20106275A0 (en) * 2010-12-02 2010-12-02 Rautaruukki Oyj Ultra high strength structural steel and a process for producing ultra high strength structural steel
KR20120072499A (en) * 2010-12-24 2012-07-04 주식회사 포스코 Precipitation hardening typed die steel with excellent hardness and toughness, and manufacturing method thereof
CN105648324A (en) * 2016-01-16 2016-06-08 舞阳钢铁有限责任公司 Large-thickness rack steel plate and production method thereof
CN108603258A (en) * 2016-05-31 2018-09-28 新日铁住金株式会社 The high-strength steel sheet of excellent in low temperature toughness
CN108998615A (en) * 2018-09-13 2018-12-14 武汉钢铁有限公司 A kind of 600MPa grades of offshore engineering structure steel and production method with excellent wear
CN112251670A (en) * 2020-09-30 2021-01-22 鞍钢股份有限公司 690 MPa-grade steel plate with good extensibility and manufacturing method thereof
CN113355583A (en) * 2021-06-07 2021-09-07 东北大学 Manufacturing method of ocean engineering steel with high strength and high toughness
CN113846270A (en) * 2021-09-29 2021-12-28 南阳汉冶特钢有限公司 Production method of extra-thick ultrahigh-strength SX690DZ35 steel plate
CN115341152A (en) * 2022-08-31 2022-11-15 鞍钢股份有限公司 Nickel-saving type-100 ℃ low-temperature steel and manufacturing method thereof

Also Published As

Publication number Publication date
CN116200682A (en) 2023-06-02

Similar Documents

Publication Publication Date Title
CN112226688B (en) Corrosion-resistant and biological-adhesion-resistant EH690 steel plate and manufacturing method thereof
CN113549828B (en) Low-yield-ratio ultrahigh-strength marine steel and manufacturing method thereof
CN111455269A (en) Yield strength 960MPa grade very high strength marine steel plate and manufacturing method thereof
CN112251672B (en) Low yield ratio EH690 steel sheet with excellent weldability and method for manufacturing same
CN111809115B (en) Super-thick plastic die steel with excellent impact corrosion wear resistance and preparation method thereof
CN112251670A (en) 690 MPa-grade steel plate with good extensibility and manufacturing method thereof
CN108342649B (en) Acid corrosion resistant quenched and tempered high-strength steel for pressure vessel and production method thereof
CN116200682B (en) High-strength high-toughness low Wen Haigong steel plate and manufacturing method thereof
CN114107800B (en) Longitudinal variable-thickness steel plate for upper deck of crude oil cargo oil tank and production method
CN116377343B (en) Marine engineering steel plate serving in polar region marine environment and manufacturing method thereof
CN115572905A (en) 690 MPa-grade tempering-resistant low-temperature quenched and tempered steel and manufacturing method thereof
CN112375997B (en) Manufacturing method of X70M pipeline steel plate used under low-cost and ultralow-temperature conditions
CN110331339B (en) High-strength steel plate with excellent low-temperature toughness and manufacturing method thereof
CN116334504B (en) Low-cost extra-thick low Wen Haigong steel plate and manufacturing method thereof
CN113151740A (en) VL4-4L steel plate with good low-temperature toughness for ship and manufacturing method thereof
CN116219318B (en) Ultra-thick marine steel plate with low yield ratio and ultra-low temperature toughness and manufacturing method thereof
CN116288064B (en) Ultra-high-strength corrosion-resistant low Wen Haigong steel plate and manufacturing method thereof
CN115747637B (en) Economical ocean atmospheric corrosion resistant steel and production method thereof
CN116179968A (en) 785MPa marine steel sheet excellent in impact toughness at-80 ℃ and method for producing same
CN113549825B (en) High-corrosion-resistance super stainless steel for ocean engineering equipment and manufacturing method thereof
CN116043130B (en) Economical 700 MPa-level storage tank steel plate with excellent die-welding performance and manufacturing method thereof
CN115369323B (en) 800 MPa-level hydrogen-induced crack resistant container steel plate and production method thereof
CN111304534B (en) High-strain steel plate for high-homogeneity L485 marine pipeline and manufacturing method thereof
CN116179970A (en) Steel plate with yield strength of 900MPa for extremely cold ocean environment and manufacturing method
CN112251671B (en) Isotropic EH690 steel plate and manufacturing method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant