CN106521319A - Super-thick EH36 steel for offshore wind power pipe pile and preparation method thereof - Google Patents
Super-thick EH36 steel for offshore wind power pipe pile and preparation 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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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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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
- C21D8/0226—Hot rolling
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- 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
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- 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
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
- C22C38/18—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
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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
- C22C38/18—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
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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
- C22C38/18—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
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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
- C22C38/18—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
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Abstract
The invention relates to super-thick EH36 steel for an offshore wind power pipe pile. The super-thick EH36 steel for the offshore wind power pipe pile comprises the following chemical components in percentage by mass: .015 to 0.18 percent of C, 0.15 to 0.30 percent of Si, 1.40 to 1.60 percent of Mn, less than or equal to 0.0070 percent of P, less than or equal to 0.0030 percent of S, 0.050 to 0.070 percent of Nb, 0.015 to 0.030 percent of V, 0.08 to 0.020 percent of Ti, 0.030 to 0.050 percent of Al, 0.15 to 0.40 percent of Ni, 0.10 to 0.20 percent of Cr, and the balance of Fe. A production process flow comprises the following steps: performing converter operation, performing LF refining, performing vacuum degasifying, performing Ca treatment, performing continuous casting, dehydrogenizing, rolling, performing air cooling, performing high-temperature hot straightening, and normalizing. According to the production process flow, the super-thick EH36 steel of 90 to 120 mm for the offshore wind power pipe pile, which is high in unit weight, high in strength, high in impact toughness, small in thickness tolerance and high in straightness and does not have a surface defect is obtained.
Description
Technical field
The invention belongs to field of steel metallurgy, and in particular to offshore wind farm pile tube use spy is thick, substance is big, thickness deviation is little,
Good EH36 steel of glacing flatness and preparation method thereof.
Background technology
Wind-powered electricity generation is considered the future of clean energy resource as a kind of regenerative resource.Wind-power electricity generation is that family and enterprise provide
Clean energy resource, reduces the pollution of climate change carbon, increases GB economic competitiveness.Due to lasting low price, more efficient wind-force
The demand of rapid growth in turbine, global range, in decades to come in, domestic wind energy market keeps powerful.
In order to reduce the homogenizing cost of electricity-generating of offshore wind farm project, blower sizes constantly increase.The bigger needs of blower fan are supporting
Facility requirements it is stricter, as sea turn motor is used in the harsh environments such as coastal waters, shallow sea, deep-sea, which is manufactured
Material requirements is also high, it is desirable to possess high intensity, anti-lamellar tearing, low temperature resistant, corrosion-resistant, easy welding.Wind-powered electricity generation is installed at present
Essential part, is still welded by traditional material iron and steel.Blower fan is bigger, and tower internal diameter is bigger, and the steel plate of needs is thicker, in order to
Save welding capacity, it is desirable to which steel plate substance is the bigger the better.It is in order to meet the demand of the large diameter of big blower fan as far as possible, general along vertical
In steel plate roll to direction batch, weld and make pipe, it is, the direction batched of pile tube rolling in order to as far as possible for steel plate
Reduce welding stress, it is desirable to steel plate has good glacing flatness, in particular perpendicular to steel plate roll to it is horizontal.In view of blower fan
Safe handling, is also strict with the thickness deviation of steel plate.Thus the steel plate of the technical requirements is produced, there are following several difficult points：
First, on the basis of special thickness EH36 steel plate obdurabilities are ensured, need to meet the thickness and precision of wind-powered electricity generation pile tube position steel plate.2nd, exist
On the basis of the obdurability for the ensureing steel plate glacing flatness ensured by steel plate.Chinese patent CN102899569A, passes through（Controlled rolling control
It is cold）The method of 0TMCP+ normalizings obtains a kind of ultralow-temperature flexibility excellent offshore wind farm Wide and Heavy Plates manufacture method, its property
The performance requirement of S355G8+N can have been reached.But the technology does not study the series such as steel plate flatness, thickness deviation, big substance pass
It is tied to the important technology index that user uses.
The content of the invention
The technical problem to be solved be for above-mentioned prior art provide a kind of special thick big, substance, high intensity,
EH36 of the flawless offshore wind farm pile tube in surface that high impact toughness, thickness deviation are little, glacing flatness is good with 90～120mm
Steel plate.
The present invention the adopted technical scheme that solves the above problems is：A kind of offshore wind farm pile tube is changed with special thickness EH36 steel
Studies be point by mass percentage C：0.15～0.18%, Si：0.15～0.30%, Mn：1.40～1.60%, P：≤
0.0070%, S：≤ 0.0030%, Nb：0.050～0.070%, V：0.015～0.030%, Ti：0.008～0.020%, Al：
0.030～0.050%, Ni：0.15～0.40%, Cr：0.10～0.20%, balance of Fe and inevitable impurity element.
The chemical composition of the steel plate is more preferably, C：0.16%, Si：0.20%, Mn：1.50%, P：≤ 0.0070%, S：
≤ 0.0030%, Nb：0.065%, V：0.020%, Al：0.035%, Ni：0.30%, Cr：0.10%, Ti：0.015%, balance of Fe and
Inevitable impurity element.
The yield strength of the application steel plate：370-410MPa, tensile strength：550-580MPa, elongation percentage >=21%, -40 DEG C
Charpy-V impact power >=120J at lower thickness 1/4, at 1/2.Steel plate meets En10160 without layering, crack defect, result of detection
S3E4 levels require, surface of steel plate bubble-free, scab, crackle, drawing crack, fold, are mingled with and are pressed into iron scale.Steel plate substance reaches
28-33 tons, surface irregularity reach per meter≤5mm, and steel plate width direction entirety per meter of unevenness≤3mm, thickness deviation are stable
Tolerance is maintained at for T-0 +2mm。
What the chemical composition of offshore wind farm pile tube spy thickness EH36 steel plates of the present invention was related such that：
The addition of C can increase the quenching degree of steel, particularly Heavy Plate Production, can significantly improve the intensity of normalized steel, but C
Content is excessively unfavorable for the ultralow temperature impact performance of steel, low temperature strain-aging performance, welding performance and corrosion resisting property, so this
In invention, carbon content control is controlled for low-carbon (LC), between 0.15～0.18%.
Si is mainly used in deoxidation, though its addition will be determined according to different smelting modes, will obtain good steel
Plate performance, it is necessary to more than 0.15%, it is contemplated that if sial spinelle is easily formed in iron scale but more than more than 0.30%, be difficult
Remove, affect steel plate integral thickness tolerance measurement value.Center portion segregation and destruction welding performance can be caused again, so regulation is thereon
It is limited to 0.30%.
Mn has in the steel and postpones effect of the austenite to ferritic transformation, to fining ferrite, improve intensity and
Toughness is favourable.When the content of manganese is relatively low, above-mentioned effect is not notable, and armor plate strength and toughness are low etc..It is too high, company can be caused again
Strand segregation, poor toughness and solderability are reduced, while classification society rule requires that the manganese content upper limit is 1.60% etc., therefore in the present invention
Add in view of the synthesis of alloy, it is stipulated that manganese content addition is in the range of 1.40～1.60%.
The pinning effect of the solute effect of dragging of Nb and Nb (C, N) to austenite grain boundary, suppresses deformed austeaite again
Crystallization, expands between the non-recrystallization zone of austenite, reduces special heavy plate production time of staying temperature.And precipitation is formed in cooling or tempering
Thing, so that intensity and toughness are improved, can be very good to suppress to roll rear steel plate because of the phenomenon of the not enough grain coarsening of cooling,
The corrosion resisting property of steel can also be improved.DeGrain when addition is less than 0.050%, during more than 0.070%, toughness is reduced, and is caused
Continuous casting billet produces face crack.Therefore, present invention provide that content of niobium should be in the range of 0.050～0.070%.
V is the excellent deoxidier of steel, is effective crystal grain thinning element, improves the intensity and toughness of steel.In normalized steel,
V belongs to precipitation strength element, while being beneficial to slab expands hydrogen in annealing process.In considering classification society's ship rule, refinement is brilliant
Grain element nb+V+Ti≤0.12%, thus with reference to the addition of Nb, it is contemplated that the contracting of slab mesolow is more inclined to continuous casting billet center than steel
The negative effect of analysis.And V is strong segregation element, adding Gu Buke more, therefore, present invention provide that content of vanadium should be between 0.015
In the range of～0.030%.
Al is the nitrogen for fixing in steel, be using Al refine substitute micro element Ti addition, with prevent Ti with
Other elements such as Nb, O, N are compound to be separated out, and forms hard Large Inclusions of prismatic etc., causes impact property unstable.Meanwhile,
Al content is too high, is easily caused the blocking of crystallizer rising head, and the large-scale formation containing Al oxides.In the present invention, it is stipulated that aluminium contains
Measure between 0.030～0.050%.
Ni is the element for improving steel hardenability, and the most frequently used element for effectively improving the low-temperature flexibility of steel.Additionally, and steel
Middle remaining Cr, P compound action, it will help the corrosion resistance of raising steel, but classification society rule's set upper limit 0.40%, in order to
Specify without departing from classification society rule.Therefore in the present invention, it is stipulated that nickel content is between 0.15～0.40%.
Cr is the element for improving steel hardenability, can suppress the formation of polygonal ferrite and pearlite, promotes low temperature group
The transformation of bainite or martensite is knitted, the intensity of steel is improved.But Cr too high levels will affect the toughness of steel, and cause Temper brittleness
Property, classification society rule is required less than 0.20%.Therefore chromium content is controlled 0.10～0.20% in the present invention.
Though P can improve corrosion resistance, low-temperature flexibility can be reduced and the solderability of steel plate is affected, be inappropriate to structural steel
, present invention provide that its control is below 0.0070%.
S forms MnS field trashes, also results in center segregation, also has harmful effect to corrosion resistance, and invention regulation is in its control
Below 0.0030%.
Consider offshore wind farm tubular pile steel plate, it is desirable to which steel plate thickness is big, substance is big, intensity is high, impact flexibility is high, thickness is public
Difference is little, and with the flawless high standards of good glacing flatness and surface, the present invention is mainly quenched with C-Mn-Cr-Ni-Cu etc.
Permeability element is alloy system, is effectively separated out with reference to microalloy Nb, V, Ti etc., crystal grain thinning.Outside which, also examine in composition design
Considered affect iron scale formed element, such as Si, Al, Ni, Cr content control, with reduce steel plate because surface pit, pockmark,
The surface defects such as pit affect the thickness deviation of each measurement point of steel plate whole plate.Addition relatively high Nb and appropriate V, passes through
Its air cooling after steel plate rolls（Non- ACC coolings）Or separate out in cooling procedure after normalizing, anchoring ferrite crystal grain triangle is brilliant
Boundary, crystal boundary, transgranular limiting ferritic fast growth, adding V contributes to the precipitation of remnants H in steel billet, steel plate simultaneously, passes through
Ti is added, and improves the welding performance of steel plate.
It is a further object of the present invention to provide preparation method of the above-mentioned offshore wind farm pile tube with special thickness EH36 steel, step bag
Include：
Smelting process：Pre-processed using molten iron, KR depth desulfurization, sulfur content is less than 0.0020%, using converter smelting, tapping process
15～20min argon bottom-blowings, nitrogen are carried out, using RH or VD Fruit storages and LF process, harmful unit is reduced as far as possible
Plain O, N, H, S, P content, carry out microalloying, then strand, and thickness of strand is 360～450mm；
Rolling mill practice：Compression ratio >=3 of continuous casting billet and finished product thickness, using controlled rolling process, continuous casting billet relation reheating temperature 1180～
1250 DEG C, 0.8～1.5min/mm of heat time is rolled using roughing and finish rolling two-stage control, the start rolling temperature of roughing between
1050-1100 DEG C, three passage single pass reduction ratio >=15% after roughing, after roughing, in the middle of gained, the thickness of base is 1.4～2.0 times
In finished product thickness；By adding enough Nb, and 850～900 DEG C higher of finish rolling start rolling temperature is combined, total rolling pass is 8
～16 passages, are cooled down using air after rolling, and rolling carries out acceleration cooling without ACC units after completing, and are led in process air cooler
Cross Nb air coolings after steel plate rolls（Non- ACC coolings）During separate out, it is anchoring ferrite crystal grain triangle crystal boundary, crystal boundary, transgranular
To limit ferritic fast growth, V contributes to the precipitation release of remnants H in steel billet, steel plate simultaneously；
The strong technique of heat：Roll rear steel plate carries out temperature correction at 600-700 DEG C, and temperature correction is mainly aligned to steel plate head, afterbody.No matter steel plate
It is whether straight, it is required for rectifying process through heat.High-temperature straightening contributes to mitigating that operation of rolling light plate head and tail temperature is low, middle temperature
Spend high and caused steel plate internal stress；
Normalizing heat treatment technique：After heat is rectified, steel plate feeding continuous oven makees normalized treatment, and continuous oven normalizing temperature is 880-920 DEG C,
Steel plate enter stove to the time of coming out of the stove be 1.6-2.2min/mm.
The present invention carries out producing offshore wind farm pile tube 90-120mm in batches on the basis of combining offshore wind farm enterprise order
Special thickness EH36 steel plates, are ensured the standby stability of extra large frock and security, and preferably may be used by enough intensity and toughness
Maintainability.In the presence of by strong external force, the corresponding performance of steel is still kept, is unlikely to destroyed.Composition is meeting ship's classification
Society requires, by roll control and normalized treatment, on steel plate thickness direction, structure property is uniform, without obvious histological difference.It is logical
Cross technologic adjustment to control steel plate flatness, make steel plate unevenness reach per meter≤5mm, steel plate width direction unevenness is every
Rice≤3mm.The reason for avoiding invar plate unevenness causes welding stress to raise and make weld seam weak area crack occur, with reference to reliability
On the basis of solder technology, it is ensured that ocean engineering has extraordinary welding performance with EH36 super-thick steel plates, it is ensured that offshore wind farm
The safety of machine structure, it is to avoid major accident occurs, there is provided the safe material used in adverse circumstances.By the present invention, batch
The offshore wind farm pile tube of production presses CCS with 90-120mm spy's thickness EH36 steel plates《Material and welding conditions》Measuring method, steel plate are thick
Degree is stably held in tolerance for T-0 +2mm。
The present invention has following features：
1st, the present invention increases the quenching degree of steel plate, with reference to micro- mainly with the quenching degree element such as C-Mn-Cr-Ni-Cu as alloy system
Alloy Nb, V, Ti etc. are effectively separated out, crystal grain thinning, and realization is not watered after rolling so that steel plate can ensure that glacing flatness.
2nd, manufacturing process of the invention has abandoned the manufacture of traditional offshore wind farm EH36 steel TMCP+ normalizings, as
Substitute, coordinate C-Mn-Cr-Ni-Cu alloy systems, and rolling heavy reduction, the present invention to roll by the way of controlled rolling+normalizing
Do not water afterwards, few control operation together is cost-effective, reduces control difficulty.
3rd, present invention defines the high warm of steel plate rectifys technique, no matter whether steel plate is straight, all passes through hot rectifying and processes.Help
In mitigating, operation of rolling light plate head and tail temperature is low, the high and caused steel plate internal stress of medium temperature.
4th, present invention production offshore wind farm pile tube is simple with EH36 Production Flow Charts, stable processing technique, production technology
Window is big, the steel plate with traditional TMCP+ normalizings, and substance is big, glacing flatness is excellent, and thickness deviation is little, stable performance, it is easy to the later stage
Batch welding.
Compared with prior art, it is an advantage of the current invention that：By simple and rational composition design, using controlled rolling+just
The mode of fire replaces the mode of traditional offshore wind farm EH36 steel TMCP+ normalizings, is equipped with rolling pass number and limits roughing
Single pass rolling reduction, and after rolling, no matter whether steel plate is straight, increases steel plate and rectifys head, rectifys the strong technique of heat of tail, obtains a kind of special
Thick, substance is big, high intensity, high impact toughness, thickness deviation are little, good straightness degree, the flawless offshore wind farm pile tube 90- in surface
120mm EH36 steel plates.Wherein yield strength is between 370-410MPa, scope of the tensile strength between 550-580MPa, elongation percentage
>=21, Charpy-V impact power >=100J at -40 DEG C at thickness 1/4, at 1/2.Steel plate material is uniform, without defects such as layering, crackles.Visit
Hinder result and meet the requirement of En10160 S3E4 levels.Surface of steel plate bubble-free, scab, crackle, drawing crack, fold, be mingled with and be pressed into oxygen
Change iron sheet.Surface of steel plate unevenness reaches per meter≤5mm, and steel plate width direction entirety unevenness≤3mm, thickness deviation are stably protected
It is T to hold in tolerance-0 +2mm.The production procedure is simple, stable processing technique, and production technology window is big, can be with popularization and application to other
Special thickness high intensity steel such as Steels for High Rise Buildings, bridge steel plate, structural steel, pressure vessel steel etc..
Description of the drawings
Fig. 1 is the embodiment typical organization under metallographic microscope（Embodiment 4）Organize at steel plate thickness 1/4, be ferrite
Pearlitic structrure, carbide dispersion be distributed in crystal boundary with it is transgranular；
Fig. 2 is the embodiment typical organization under metallographic microscope（Embodiment 4）Organize at steel plate thickness 1/2, be ferrite pearly-lustre
Body is organized, suitable with crystallite dimension at thickness 1/4.
Specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing embodiment.
The technological process of production of ocean engineering of the present invention spy's thickness RH36 steel is：Converter->LF refining->RH vacuum outgas->
Ca process->Continuous casting->Strand Dehydroepiandrosterone derivative->Heating->Rolling->Air cooling->High temperature thermal straightening->Normalizing.
A kind of offshore wind farm pile tube of embodiment of the present invention 1-6 special thickness EH36 steel and preparation method thereof, including following step
Suddenly：
（1）Smelt：Using 150 tons of converter smeltings, it is then fed into LF stoves and is refined and through RH Fruit storages, broken sky enters
Row Ca process, Composition Control are shown in Table 1.
（2）Continuous casting：The molten steel of smelting is cast into into the thick continuous casting billets of 360mm-450mm.Cast temperature is controlled in liquidus curve
Above 10-25 DEG C.Implement dynamic soft-reduction in casting cycle.
（3）Strand expands hydrogen and processes：Hydrogen is expanded in the slow cooling of continuous casting steel billet covering, is 48 hours in the cover time.
（4）Rolling：By step（3）Gained continuous casting billet is put into walking beam furnace, is heated to 1180-1250 DEG C, during heating
Between be 0.8～1.5min/mm, make the abundant solid solution of alloying element in steel to ensure the uniform of the composition and performance of final products
Property.After steel billet is come out of the stove, Jing roughing+finish rolling two-stage control is rolled.The start rolling temperature of roughing is pressed using big between 1050-1100 DEG C
Lower amount rolling, three road percentage pass reduction >=15% after roughing.Treat 1.4～2.0 times of finished product thicknesses of temperature thickness.Finish rolling start rolling temperature
Between 850-900 DEG C.Total rolling pass is 8～16 passages, is cooled down using air after rolling.Roll after completing without ACC machines
Group carries out water spray and accelerates cooling, casting parameters to be shown in Table 2.
（5）Heat is rectified：By step（4）Gained steel plate carries out temperature correction under 600-700 DEG C of high temperature, and temperature correction is mainly to steel plate head
Portion, afterbody aligning.
（6）Normalizing：By step（5）Gained steel plate sends into continuous oven, and normalizing temperature is 880-920 DEG C, and steel plate enters stove to going out
The stove time is 1.6-2.2min/mm.
（6）Cross directional stretch, impact of collision and whole plate unevenness, the detection of thickness deviation are carried out to the steel plate after normalizing.
Concrete composition, technological parameter are shown in Table 1, table 2.
The corresponding performance of each example steel plate is shown in Table 3.
Wherein yield strength between 370-410MPa, scope of the tensile strength between 550-580MPa, elongation percentage >=21% ,-
Charpy-V impact power >=120J at 40 DEG C at thickness 1/4, at 1/2.
Steel plate apparent size is shown in Table 4.Steel plate thickness 90-120mm, substance is between 28-33 tons.Template is very good, passes through
Control steel plate unevenness, wherein surface of steel plate unevenness reach per meter≤5mm, and steel plate width direction per meter of unevenness of entirety≤
3mm, it is to avoid the problem of invar plate unevenness causes welding stress, makes weld seam weak area crack occur, with reference to reliable welding skill
In art, it is ensured that ocean engineering has extraordinary welding performance with EH36 super-thick steel plates, it is ensured that the peace of the structure of sea turn motor
Entirely, it is to avoid catastrophic failure occurs.Meeting 2015 CCS《Material and welding conditions》The numerical value of all measurement points of light plate is not
Less than steel plate nominal thickness, that is, on the basis of GB/T709-2006 standard C class standards are met, being stably held in tolerance is
T-0 +2mm.Steel plate material is uniform, without defects such as layering, crackles.Result of detection meets the requirement of En10160 S3E4 levels.Surface of steel plate
Bubble-free, scab, crackle, drawing crack, fold, be mingled with and be pressed into iron scale.
Fig. 1,2 give embodiment typical microstructure photo.The microstructure of finished steel plate is ferritic-pearlitic
Tissue, carbide dispersion be distributed in crystal boundary with it is transgranular.Ferrite grain size is between 5-15um.It can be seen that, by rational composition
Design carries out controlled rolling+normalizing, and the steel plate of so big thickness, crystal grain are not roughened.While armor plate strength is met, fully ensure that
The low-temperature impact toughness of steel plate.
Chemical composition of the 1 embodiment offshore wind farm pile tube of table with EH36 steel plates（wt%）
2 rolling mill practice of table is controlled
The stretching of 3 embodiment of the present invention of table, impact property
The thickness and glacing flatness of 4 embodiment of the present invention steel plate of table
In addition to the implementation, present invention additionally comprises there is other embodiment, all employing equivalents or equivalence replacement mode
The technical scheme of formation, all should fall within the scope of the hereto appended claims.
Claims (6)
1. a kind of offshore wind farm pile tube is with special thickness EH36 steel, it is characterised in that：Chemical composition is C by mass percentage：0.15
～0.18%, Si：0.15～0.30%, Mn：1.40～1.60%, P：≤ 0.0070%, S：≤ 0.0030%, Nb：0.050～
0.070%, V：0.015～0.030%, Ti：0.008～0.020%, Al：0.030～0.050%, Ni：0.15～0.40%, Cr：
0.10～0.20%, balance of Fe and inevitable impurity element.
2. offshore wind farm pile tube according to claim 1 is with special thickness EH36 steel, it is characterised in that：The chemical composition of the steel plate
It is preferably by weight percentage, C：0.16%, Si：0.20%, Mn：1.50%, P：≤ 0.0070%, S：≤ 0.0030%, Nb：
0.065%, V：0.020%, Al：0.035%, Ni：0.30%, Cr：0.10%, Ti：0.015%, balance of Fe and inevitably miscellaneous
Prime element.
3. offshore wind farm pile tube according to claim 1 and 2 is with special thickness EH36 steel, it is characterised in that：The surrender of the steel plate
Intensity：370-410MPa, tensile strength：550-580MPa, elongation percentage >=21%, Charpy punching at -40 DEG C at thickness 1/4, at 1/2
Hit work(>=120J.
4. offshore wind farm pile tube according to claim 1 and 2 is with special thickness EH36 steel, it is characterised in that：Steel plate is split without layering
Line defect, result of detection meet the requirement of En10160 S3E4 levels, surface of steel plate bubble-free, scab, crackle, drawing crack, fold, are mingled with
With press-in iron scale.
5. offshore wind farm pile tube according to claim 1 and 2 is with special thickness EH36 steel plates, it is characterised in that：Steel plate substance reaches
28-33 tons, surface irregularity reach per meter≤5mm, and steel plate width direction entirety per meter of unevenness≤3mm, thickness deviation are stable
Tolerance is maintained at for T-0 +2mm。
6. the method that offshore wind farm pile tube described in a kind of manufacturing claims 1 or 2 uses special thickness EH36 steel plates, it is characterised in that：Work
Skill is as follows,
The pretreatment of raw material Jing molten iron, KR depth desulfurization rear converters are smelted, and tapping process carries out 15～20min argon bottom-blowings, nitrogen, adopts
With RH or VD Fruit storages and LF process, the thick continuous casting billets of 360～450mm are then cast, continuous casting billet is again heated to
1180～1250 DEG C, 0.8～1.5min/mm of heat time is rolled using roughing and finish rolling two-stage control, the open rolling temperature of roughing
Degree 1050-1100 DEG C, single pass reduction ratio >=15% of three passages after roughing, after roughing gained in the middle of base thickness be 1.4～
2.0 times of finished product thicknesses；Finish rolling start rolling temperature is 850～900 DEG C, and total rolling pass is 8～16 passages, does not water, adopt after rolling
Cooled down with air, after rolling, gained steel plate carries out temperature correction in 600-700 DEG C of temperature range, and the steel plate after heat is rectified sends into continuous oven
Make normalized treatment, continuous oven normalizing temperature is 880-920 DEG C, it is 1.6-2.2min/mm that steel plate enters stove to the time of coming out of the stove.
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