CN106544597A - Ultra-thin ultra-wide steel for nuclear power pressure equipment plate and its manufacture method - Google Patents

Ultra-thin ultra-wide steel for nuclear power pressure equipment plate and its manufacture method Download PDF

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CN106544597A
CN106544597A CN201610908953.7A CN201610908953A CN106544597A CN 106544597 A CN106544597 A CN 106544597A CN 201610908953 A CN201610908953 A CN 201610908953A CN 106544597 A CN106544597 A CN 106544597A
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ultra
rolling
steel
temperature
nuclear power
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CN106544597B (en
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杨秀利
刘文斌
梁宝珠
战国锋
王宪军
郭斌
李书瑞
洪霞
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Wuhan Iron and Steel Co Ltd
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Wuhan Iron and Steel Corp
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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
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/44—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
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials 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 discloses a kind of ultra-thin ultra-wide steel for nuclear power pressure equipment plate, its thickness is 5～12mm, and width is 2800～4100mm, and each chemical composition content is：C：≤ 0.20%；Si：≤ 0.10%；Mn：0.50%～1.80%；P：≤ 0.008%；S：≤ 0.003%；Ni：0.20%～1.00%；Cr：0.30%～0.80%；Cu：0.10%～0.80%；Mo：≤ 0.08%；Alt：≤ 0.040%；N：≤ 0.008%；Balance of Fe and inevitably it is mingled with.The invention also discloses the production method of the steel plate, comprises the following steps：1) smelt by the chemical composition content and be cast as base；2) rolled using two fire technique of becoming a useful person；3) heat treatment is carried out using normalizing process.The steel plate has good obdurability, Flouride-resistani acid phesphatase fragility, good weldability and processing characteristics, meets demand of the nuclear power pressure equipment to ultra-thin ultra-wide steel plate.

Description

Ultra-thin ultra-wide steel for nuclear power pressure equipment plate and its manufacture method
Technical field
The present invention relates to a kind of steel for nuclear power pressure equipment, particularly relates to a kind of ultra-thin ultra-wide steel for nuclear power pressure equipment plate And its manufacture method.
Background technology
Equipment one of of the nuclear power pressure equipment as nuclear reactor most critical, is that nuclear power station life cycle management is non-exchange One of one of critical component, and the determiner in nuclear plant safety and life-span, so the security performance of midium-carbon steel seems outstanding For important.In the manufacture process of steel for nuclear power pressure equipment structure, as structure design needs, partial component adopts thickness 5 ～12mm, the ultra-thin wide specification steel plate of width 2800～4100 are welded, while, it is desirable to steel plate have good obdurability, Flouride-resistani acid phesphatase fragility, good weldability and processing characteristics etc., and for the mill production of 4300mm cut deal producing lines, production Thickness is the thin wide plate of 5mm and width in more than 2800mm, and than larger, the problems such as shape wave, steel-fastening easily occurs to rolling difficulty in steel plate, The lumber recovery of product is had a strong impact on, the guarantee of performance of delivering goods to steel plate it is also proposed challenge.
The Chinese patent application of Application No. 201210064306.4, discloses a kind of nuclear pressure container steel and its system Method is made, is comprised the steps：1) smelt, block, the composition by weight percent of steel is：C0.05～0.20%, Si0.10 ～0.40%, Mn0.75～1.6%, Cr0.15～0.6%, Nb0.010～0.04%, Ti0.008～0.03%, Alt0.030 ～0.050%, Ca0.0010～0.0050%, N0.003～0.012%, S≤0.010%, P≤0.012%, Sn≤ 0.003wt.%, Sb≤0.002%, As≤0.003%, remaining is Fe and inevitable impurity, and Alt/N >=2；2) hot rolling, 1100～1250 DEG C of slab heating temperature, 950～1020 DEG C of first stage rolling temperature, reduction ratio >=80%, second stage roll 780～900 DEG C of temperature processed, reduction ratio >=60%；3) cooling, batch, 4.0～15 DEG C/s of rate of cooling, coiling temperature 590～ 680 DEG C, by cooling controlling and rolling controlling process, the microscopic structure for obtaining nuclear pressure container steel plate is fine ferrite+pearlite group Knit.The patent stresses by cooling controlling and rolling controlling process to meet nuclear pressure container hardness of steel requirement, and mainly for conventional thickness The production of metric lattice.
The Chinese patent of Application No. 201110125892.4, discloses a seed nucleus one-level key equipment steel plate.The steel Plate is made up of the component of following weight percentage：0 ＜ C≤0.20%, Si：0.10-0.30%, Mn：1.20-1.60%, P≤ 0.012%, S≤0.012%, Mo：0.45-0.55%, Ni：0.50-0.80%, 0 ＜ Cr≤0.25%, 0 ＜ V≤0.03%, 0 ＜ Cu≤0.20%, 0 ＜ Al are total≤0.040%, balance of Fe and inevitable impurity.The core one-level key equipment of the present invention Compactness with steel plate is high, and intensity is high, and low-temperature impact toughness and high temperature tensile properties are good, anti-lamellar tearing performance, cold working And good welding performance, meet the requirement of nuclear power key equipment, can be applicable to the key equipments such as nuclear power plant evaporator, pressure vessel Manufacture.The patent is directed to new composition design system, using pair rolling and Technology for Heating Processing, is not directed to Limit specifications The production method of midium-carbon steel.
The Chinese patent application of Application No. 201210309621.9 discloses a kind of super-large thickness for nuclear power engineering equipment Steel plate and production method, belong to technical field of steel production.Technical scheme is component of the steel plate by following weight percentage Composition：C≤0.20%, Si：0.10-0.30%, Mn：1.15-1.60%, P≤0.012%, S≤0.010, Mo：0.45- 0.55%, Ni：0.50-0.80%, Cr≤0.20%, V≤0.01%, Cu≤0.18%, Nb≤0.02%, Ti≤0.03%, Al is total >=0.020%, Cu+6Sn≤0.33%.Residual volume is Fe and inevitable impurity, comprising smelting, cast, heat, roll System, cooling, quenched operation.The ultra-thick steel plate and production method of the present invention, the thickness of steel plate is 155mm, and production method is new Clever unique, armor plate strength is moderate, and low-temperature impact toughness and high temperature tensile properties are good, anti-lamellar tearing performance, cold working and weldering Connect that performance is good, meet the requirement of nuclear power key equipment, can be applicable to nuclear power plant evaporator, high pressure cover end and pressure vessel etc. The manufacture of key equipment.
In sum, temporarily do not disclose thickness in prior art to be 2800～4100mm, and have for 5～12mm, width There is the ultra-thin ultra-wide steel for nuclear power pressure equipment plate of good obdurability, Flouride-resistani acid phesphatase fragility, good weldability and processing characteristics And its manufacture method
The content of the invention
It is an object of the invention to provide the ultra-thin ultra-wide core that a kind of thickness is 5～12mm, width is 2800～4100mm Electric Steel Used for Pressure Retaining Components plate and its manufacture method.
For achieving the above object, ultra-thin ultra-wide steel for nuclear power pressure equipment plate provided by the present invention, its thickness be 5～ 12mm, width are 2800～4100mm, and the steel plate is made up of the chemical composition of following weight percentage：C：≤ 0.20%；Si： ≤ 0.10%；Mn：0.50%～1.80%；P：≤ 0.008%；S：≤ 0.003%；Ni：0.20%～1.00%；Cr： 0.30%～0.80%；Cu：0.10%～0.80%；Mo：≤ 0.08%；Alt：≤ 0.040%；N：≤ 0.008%；It is balance of Fe and inevitable impurity.
Preferably, the steel plate is made up of the chemical composition of following weight percentage：C：0.08%～0.15%；Si： 0.05%～0.10%；Mn：0.80%～1.60%；P：≤ 0.008%；S：≤ 0.003%；Ni：0.30%～0.80%； Cr：0.30%～0.60%；Cu：0.10%～0.50%；Mo：0.03%～0.08%；Alt：0.020%～0.040%；N： ≤ 0.005%；Balance of Fe and inevitable impurity.
Preferably, the mechanical property of the steel plate is as follows：Yield strength：ReL380～465MPa, 300 DEG C of Rp0.2：300～ 355MPa；Tensile strength Rm：500～556MPa；Elongation percentage A：29.5%～32%；- 60 DEG C of KV of ballistic work2：75～89J.
The reasons why steel plate of the present invention described briefly below selectes each alloying element and composition range：
C, set point≤0.20%, preferably 0.08～0.15%.It is solution strengthening element, with the increase of C content, In steel, Fe3C increases therewith, and hardenability is further improved, and the intensity of steel is improved, but elongation percentage and impact flexibility can decline, especially Which is to affect larger and too high carbon content to be unfavorable for the weldability of steel plate low-temperature flexibility.
Si, set point≤0.10%, preferably 0.05～0.10%.Carbide is not formed in steel, with the shape of solid solution State is present in ferrite or austenite, can improve the intensity and cold deformation hardening ratio of solid solution in steel, but silicone content When higher, the easy decarburization of surface of steel plate.Meanwhile, Si elements are harmful to irradiation, should strictly control containing for non-alloyed element w (Si) Amount.
Mn, set point 0.50～1.80%, preferably 0.80～1.60%.Good deoxidizer and desulfurizing agent, and ferrum shape Into solid solution, the hardness and intensity of ferrite and austenite in steel are improved, and critical transition temperature can be reduced, but manganese content is higher When, it is roughened crystalline grain of steel, increases Temper brittleness sensitivity, and be unfavorable for the weldability of steel plate.
Ni：Set point 0.20～1.00%, preferably 0.30～0.80%.It is can to improve intensity in steel, again can be effective Improve the element of toughness, particularly low-temperature flexibility.Typically it is added in the steel for needing higher-strength higher toughness, with reference to this enforcement The intensity and toughness index of steel grade, it is a small amount of to add.
Cr：Set point 0.30～0.80%, preferably 0.30～0.60%.The resistance to corrosion of steel can be increased, also right and wrong Often effective intensified element, as this enforcement steel grade intensity rank is medium, only need to add Cr elements on a small quantity.
Cu：Set point 0.10～0.80%, preferably 0.10～0.50%.Improve the weather-resistant of ordinary low-alloy steel Performance, while producing beneficial effect to intensity and toughness, it is contemplated that the anti-radiation performance of nuclear power steel is required, strictly should control Cu constituent contents in steel processed.
Mo：Set point≤0.08%, preferably 0.03～0.08%.Recrystallization temperature is significantly improved, with significantly solid Molten reinforcing effect, improves the heat resistance of steel.But when Mo contents are excessive, welding crack sensibility can be increased, reduce the tough of steel Property and processing characteristics.
N：Set point≤0.008%, preferably≤0.005%.Enter in steel, while liquid metal can also be from sky with furnace charge A part is absorbed in gas, ferrum is solid-solution in, solid solution is formed, solution strengthening effect can be played, but due to the precipitation of Fe4N, be easily caused Timeliness and blue shortness phenomenon.
Alt (total aluminum, also referred to as full aluminum)：Set point≤0.040%, preferably 0.020%～0.040%.During Al is steel Main deoxidant element, the Al of certain content can also refine the crystal grain of steel plate, improve the intensity and toughness of steel plate.But work as Al content When higher, it is mingled with being easily caused steel and increases, it is unfavorable to the toughness of steel, while the hardenability of steel can be reduced.
P, S and other impurity elements：P, S are the impurity elements being harmful in steel, although P can increase substantially intensity, easily Segregation is formed in steel, the toughness and welding performance of steel is reduced, S easily forms plasticity sulfide, made steel anisotropy serious, deteriorate The impact flexibility and processing characteristics of steel, therefore its content should be more low better, controls level with reference to actual production, P≤0.008%, and S≤ 0.003%.The impurity elements such as As, Sn, Sb are the harmful elements in steel, unfavorable to the plasticity and toughness of steel, from performance guarantee Angle, content are controlled to As≤0.01%, Sn≤0.008%, Sb≤0.005%.
Invention also provides the manufacture method of aforementioned ultra-thin ultra-wide steel for nuclear power pressure equipment plate, including following step Suddenly：
1) smelt by afore mentioned chemical component content and be cast as base；
2) rolled using two fire technique of becoming a useful person, specifically included：
2.1) implement split rolling method, split rolling method technique is：1240 ± 20 DEG C of strand tapping temperature, a fiery roughing open rolling temperature 1180～1230 DEG C of degree (before roughing plus " one is fiery " be in order to cogging after the roughing that rolls distinguish, similarly hereinafter), a fiery roughing end 1080～1100 DEG C of temperature is rolled, and carries out a high-pressure water descaling, de-scaling high-pressure water pressure is controlled in 25～48MPa；
2.2) roll after cogging：1200～1280 DEG C of slab heating temperature, the time of staying in the heating furnace >=8min/ li Rice thickness of slab, i.e., be not less than 8 minutes the heat time heating time that slab thickness per cm should reach, if slab thickness is 100mm, heat time heating time 80min should be not less than；Two fiery roughing start rolling temperatures be 1180～1230 DEG C (before roughing plus " two is fiery " be in order to split rolling method Roughing is distinguished), two fiery roughing finishing temperatures are 1140～1210 DEG C, and roughing rolls 1～3 passage；Finish rolling start rolling temperature is 1100～1180 DEG C, finish rolling finishing temperature is 700～900 DEG C, and finish rolling rolls 7～11 passages；
3) heat treatment, using normalizing process, normalizing temperature is 850～920 DEG C, and normalizing temperature retention time is 30～50min.
Preferably, step 1) in, smelting process adopts converter smelting, argon station Argon, LF heating furnaces and RH vacuum drying ovens successively Processed, and base is cast as using continuous casting process.
Preferably, step 2.1) in, in the operation of rolling, roller-way water is all closed down, and roller repairing water water rate control is：Upper spray Mouth streamflow is 120m3/ min, lower nozzle streamflow are 200m3/min。
Preferably, step 2.2) in, the control of finish rolling start rolling temperature at 1120～1180 DEG C, finishing temperature control 770～ 800℃。
Preferably, step 2.2) in, rough rolling step adopts high temperature heavy reduction rolling, draught per pass >=20mm (pressure Lower rate is about 25%)；The finish rolling stage declines with steel billet temperature, gradually reduces under draught per pass, but last three passages stagnation pressure Rate >=40%, last percentage pass reduction >=11%.
Preferably, step 2.1) in, during split rolling method, cogging size is：Thick 100mm, wide 1700～2800mm, long 2400 ～4100mm, cogging compression ratio >=3.0.
The reasons why production technology described briefly below sets：
Smelting molten steel adopts converter smelting, casting to adopt continuous casting.Smelting process adopts RH vacuum system refines, it is therefore intended that The harmful components such as large inclusionses SiO2, slag inclusion CaO and N, H, O gas in steel are removed by RH vacuum cycles process.
The operation of rolling is become a useful person technique productions using two fire, i.e., first continuous casting billet heating, rolling, pinch-off, slab are reheated, rolled System, cooling, heat treatment, original blank size is (200～250) × (1500～2300) × (2400～4100) mm, after cogging Billet size be 100 × (1700～2800) × (2400～4100mm), cogging compression ratio >=3.0, in order to avoid steel plate is rolling During system, temperature drop is too fast, and cooling system is optimized, and roller-way water is all closed down, and the roller repairing water water yield is adjusted to 120m3/ min, lower 200m3/ min, while the pressure of de-scaling water under high pressure is improved, can fast and effeciently remove surface of steel plate oxidation Iron sheet, and reduce thermal loss.
In view of 5～12mm of thickness, the template control of the ultra-thin ultra-wide nuclear power pressure equipment steel plate of 2800～4100mm of width Difficulty processed is larger, properly increases finish rolling start rolling temperature and finishing temperature, and correspondence is 1100～1180 DEG C and 700～900 DEG C respectively, Ensure that finish rolling finish to gauge is rolled in austenite non-recrystallization region, using constant ratio convexity rolling model, calculate draught per pass, And this enterprise rolling Limiting Level is combined, increase draught per pass as far as possible, reduce rolling pass, specially：To roll Journey is rolled in two stages, and the first stage, second stage declined with steel billet temperature, appropriate to reduce every using high temperature big pressure rolling Reduction in pass, last three passages total reduction >=40%, finish rolling end percentage pass reduction >=11%, although increasing extreme trace time pressure Control of the lower rate to steel plate template precision is unfavorable, but can promote austenite recrystallization and crystal grain refinement, and comprehensive raising steel plate is tough Property.To guarantee that steel plate must be aligned after rolling into heat-treatment furnace steel plate template.
By being optimized to cooling system in the operation of rolling, increase draught per pass as far as possible, can be prevented effectively from by The template problem caused by very thin wide specification steel plate temperature drop in the operation of rolling is too fast, while avoiding original blank disposably continuous Rolling holds loading capability more than Wide and Thick Slab producing line length.
In order to ensure steel for nuclear power pressure equipment obtains the pearlite and ferritic structure of fine uniform, to Limit specifications core Electric bearing device steel plate carries out normalizing heat treatment, takes the shadow of heat treatment temperature and temperature retention time to thin specification steel plate intensity into consideration Ring, normalizing temperature is set as into 850～920 DEG C, normalizing temperature retention time is 30～50min.
The invention has the beneficial effects as follows：Ultra-thin ultra-wide steel for nuclear power pressure equipment plate and its manufacturer that the present invention is provided Method, improves purity of steel using advanced steel-smelting technology, setting is optimized to rolling technological parameter, to guarantee the plate of steel plate Type, by appropriate Technology for Heating Processing, it is ensured that the tough matching of steel plate and high-temperature behavior, reaches steel plate room temperature strength surplus capacity More than 50MPa, 300 DEG C of elevated temperature strength surplus capacities are up to 45～80MPa, while with good low-temperature impact toughness, -60 DEG C are impacted Work(meansigma methodss reach more than 80J, and chemical composition is relatively easy, low production cost, give full play to the rolling potential of existing milling train. The steel plate has good obdurability, Flouride-resistani acid phesphatase fragility, good weldability and processing characteristics, meets nuclear power pressure equipment to super The demand of thin ultra-wide steel plate.
Description of the drawings
Fig. 1 is the metallographic structure photo of the steel plate of the production of embodiment 1.
Specific embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
The present invention provide Limit specifications steel for nuclear power pressure equipment plate, its thickness be 5～12mm, width be 2800～ 4100mm, its chemical component weight percentage ratio is：C：≤ 0.20, Si：≤ 0.10, Mn：0.50～1.80, P≤0.008, S≤ 0.003, Alt：≤ 0.040, Ni：0.20～1.00, Cr：0.30～0.80, Cu：0.10～0.80, Mo：≤ 0.08, Sn≤ 0.008, As：≤ 0.01, N≤0.008, balance of Fe and are inevitably mingled with.In each embodiment, comparative example, constituent content Concrete value be listed in table 1.
1 embodiment of the present invention of table and compared steel main chemical compositions (mass fraction %)
The manufacture method of above-mentioned ultra-thin ultra-wide steel for nuclear power pressure equipment plate, comprises the steps：
1) smelt
Using Desulphurization of Pig Iron, converter smelting, argon station Argon, LF heating furnaces and RH vacuum drying ovens are carried out successively and processes (true Empty process time is not less than 15min)；
2) roll
Become a useful person technique productions using two fire, that is, implement split rolling method, cogging size：100 (thickness) * (1700～2800) (width) * (2400～4100) (length) mm, cogging compression ratio >=3.0, concrete split rolling method technique is：Strand tapping temperature 1240 ± 20 DEG C, fiery 1180～1230 DEG C of a roughing start rolling temperature, 1080～1100 DEG C of a fiery roughing finishing temperature, and carry out a high pressure Water de-scaling, and high-pressure water pressure is brought up to into 25～48MPa.
Rolling mill practice after cogging：1200～1280 DEG C of slab heating temperature, the rate of heat addition are >=8min/cm, two fiery roughing Start rolling temperature is 1180～1230 DEG C, and two fiery roughing finishing temperatures are 1140～1210 DEG C, and roughing rolls 1～3 passage；Finish rolling is opened Temperature is rolled for 1100～1180 DEG C, finish rolling finishing temperature is 700～900 DEG C, and finish rolling rolls 7～11 passages；Rough rolling step is adopted High temperature heavy reduction rolling, draught per pass >=20mm；The finish rolling stage declines with steel billet temperature, gradually reduces every time pressure Lower amount, but last three passages total reduction >=40%, last percentage pass reduction >=11%.
3) Technology for Heating Processing
Technology for Heating Processing is normalizing process, and normalizing temperature is 850～920 DEG C, and normalizing temperature retention time is 30～50min.
In each embodiment, comparative example, the concrete value of technological parameter is listed in table 2, and in table 1, table 2, same numbering represents same Composition and technological parameter that individual embodiment is adopted.
The main rolling of 2 each embodiment of table and compared steel and heat treatment process parameter
The mechanics properties testing result row of the ultra-thin ultra-wide steel for nuclear power pressure equipment plate that above example, comparative example are obtained In table 3.
The mechanical properties test result of 3 embodiment of the present invention of table and comparative example
From table 1 it follows that embodiment of the present invention addition alloying element content is few, steel is pure, is ensureing performance Simultaneously effective reduces cost；From Table 2, it can be seen that the present embodiment is different from other Limit specifications Plate Production methods, While ensureing steel plate template, rolling pass is reduced, production efficiency is significantly improved；From table 3 it is observed that the present invention is entirely capable of Meet mechanical property requirements when environment is 300 DEG C, and high-temperature behavior surplus capacity is sufficient, while with good tough matching ,- 60 DEG C of impact flexibility are excellent, it is ensured that the safety that nuclear power pressure equipment is used.
Fig. 1 is the metallographic structure photo of the steel plate of the production of embodiment 1, it can be seen that the predominantly uniform tiny ferrum of steel plate Ferritic+pearlitic structrure, reduces banded structure degree, it is ensured that the stability organized during steel plate use.

Claims (9)

1. a kind of ultra-thin ultra-wide steel for nuclear power pressure equipment plate, its thickness are 5～12mm, and width is 2800～4100mm, and which is special Levy and be：It is made up of the chemical composition of following weight percentage：C：≤ 0.20%；Si：≤ 0.10%；Mn：0.50%～ 1.80%；P：≤ 0.008%；S：≤ 0.003%；Ni：0.20%～1.00%；Cr：0.30%～0.80%；Cu：0.10% ～0.80%；Mo：≤ 0.08%；Alt：≤ 0.040%；N：≤ 0.008%；Balance of Fe and inevitable impurity.
2. ultra-thin ultra-wide steel for nuclear power pressure equipment plate according to claim 1, it is characterised in that：By following weight percent The chemical composition composition of content：C：0.08%～0.15%；Si：0.05%～0.10%；Mn：0.80%～1.60%；P：≤ 0.008%；S：≤ 0.003%；Ni：0.30%～0.80%；Cr：0.30%～0.60%；Cu：0.10%～0.50%；Mo： 0.03%～0.08%；Alt：0.020%～0.040%；N：≤ 0.005%；Balance of Fe and inevitable impurity.
3. ultra-thin ultra-wide steel for nuclear power pressure equipment plate according to claim 1 and 2, it is characterised in that：The power of the steel plate Learn performance as follows：Yield strength：ReL380～465MPa, 300 DEG C of Rp0.2：300～355MPa；Tensile strength Rm：500～ 556MPa；Elongation percentage A：29.5%～32%；- 60 DEG C of KV of ballistic work2：75～89J.
4. a kind of manufacture method of ultra-thin ultra-wide steel for nuclear power pressure equipment plate according to claim 1 and 2, its feature exist In：Comprise the steps：
1) smelt by the chemical composition content and be cast as base；
2) rolled using two fire technique of becoming a useful person, specifically included：
2.1) implement split rolling method, split rolling method technique is：1240 ± 20 DEG C of strand tapping temperature, a fiery roughing start rolling temperature 1180～1230 DEG C, 1080～1100 DEG C of a fiery roughing finishing temperature, and carry out a high-pressure water descaling, de-scaling high-pressure water pressure Control is in 25～48MPa；
2.2) roll after cogging：1200～1280 DEG C of slab heating temperature, the time of staying >=8min/ centimetre of plate in heating furnace It is thick；Two fiery roughing start rolling temperatures are 1180～1230 DEG C, and two fiery roughing finishing temperatures are 1140～1210 DEG C, roughing rolling 1～3 Passage；Finish rolling start rolling temperature is 1100～1180 DEG C, and finish rolling finishing temperature is 700～900 DEG C, and finish rolling rolls 7～11 passages；
3) heat treatment, using normalizing process, normalizing temperature is 850～920 DEG C, and normalizing temperature retention time is 30～50min.
5. the manufacture method of ultra-thin ultra-wide steel for nuclear power pressure equipment plate according to claim 4, it is characterised in that：Step 1), in, smelting process is processed using converter smelting, argon station Argon, LF heating furnaces and RH vacuum drying ovens successively, and adopts continuous casting Cast is into base.
6. the manufacture method of ultra-thin ultra-wide steel for nuclear power pressure equipment plate according to claim 4, it is characterised in that：Step 2.1) in, in the operation of rolling, roller-way water is all closed down, and roller repairing water water rate control is：Top nozzle streamflow is 120m3/ Min, lower nozzle streamflow are 200m3/min。
7. the manufacture method of ultra-thin ultra-wide steel for nuclear power pressure equipment plate according to claim 4, it is characterised in that：Step 2.2), in, at 1120～1180 DEG C, finish rolling finishing temperature is controlled at 770～800 DEG C the control of finish rolling start rolling temperature.
8. the manufacture method of the ultra-thin ultra-wide steel for nuclear power pressure equipment plate according to any one of claim 4～7, which is special Levy and be：Step 2.2) in, rough rolling step adopts high temperature heavy reduction rolling, draught per pass >=20mm；The finish rolling stage with Steel billet temperature decline, draught per pass, but last three passages total reduction >=40% is gradually reduced, last percentage pass reduction >= 11%.
9. the manufacture method of the ultra-thin ultra-wide steel for nuclear power pressure equipment plate according to any one of claim 4～7, which is special Levy and be：Step 2.1) in, during split rolling method, cogging size is：Thick 100mm, wide 1700～2800mm, long by 2400～ 4100mm, cogging compression ratio >=3.0.
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