CN106544597B - 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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CN106544597B
CN106544597B CN201610908953.7A CN201610908953A CN106544597B CN 106544597 B CN106544597 B CN 106544597B CN 201610908953 A CN201610908953 A CN 201610908953A CN 106544597 B CN106544597 B CN 106544597B
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rolling
ultra
temperature
steel
nuclear power
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CN201610908953.7A
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CN106544597A (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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武汉钢铁有限公司
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226Hot rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263Modifying 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
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese

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%;Surplus is Fe and is inevitably mingled with.The invention also discloses the production method of the steel plate, comprise the following steps:1) smelted by the chemical composition content and be cast as base;2) rolled using two fire technique of becoming a useful person;3) it is heat-treated using normalizing process.The steel plate has good obdurability, Flouride-resistani acid phesphatase fragility, good weldability and processing characteristics, meets the needs of nuclear power pressure equipment is 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
One of the equipment of nuclear power pressure equipment as nuclear reactor most critical, it is that nuclear power station life cycle management is non-exchange One of critical component, and one of the determinant in nuclear plant safety and life-span, so the security performance of midium-carbon steel seems outstanding To be important.In the manufacturing process of steel for nuclear power pressure equipment structure, because structure design needs, partial component uses thickness 5 ~12mm, the ultra-thin wide specification steel plate of width 2800~4100 are welded, simultaneously, 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 rolling difficulty is bigger, and the problems such as shape wave, steel-fastening easily occurs in steel plate, The lumber recovery of product is had a strong impact on, the guarantee for performance of being delivered goods to steel plate it is also proposed challenge.
The Chinese patent application of Application No. 201210064306.4, disclose a kind of nuclear pressure container steel and its system Method is made, is comprised the following 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 is rolled 780~900 DEG C of temperature processed, reduction ratio >=60%;3) cool down, batch, 4.0~15 DEG C/s of cooling velocity, coiling temperature 590~ 680 DEG C, by cooling controlling and rolling controlling process, it is fine ferrite+pearlite group to obtain nuclear pressure container with the microscopic structure of steel plate Knit.The patent stresses to meet nuclear pressure container hardness of steel requirement by cooling controlling and rolling controlling process, and mainly for conventional thickness The production of metric lattice.
The Chinese patent of Application No. 201110125892.4, disclose 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 Always≤0.040%, surplus is Fe and inevitable impurity by < Cu≤0.20%, 0 < Al.The core one-level key equipment of the present invention High with the compactness of steel plate, 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 applied 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 process.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 applied to nuclear power plant evaporator, high pressure cover end and pressure vessel etc. The manufacture of key equipment.
In summary, without open thickness it is temporarily in the prior art 5~12mm, width is 2800~4100mm, and has 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 5~12mm it is an object of the invention to provide a kind of thickness, the ultra-thin ultra-wide core that width is 2800~4100mm Electric Steel Used for Pressure Retaining Components plate and its manufacture method.
To achieve 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%;Surplus is 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%;Surplus is 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, setting range≤0.20%, preferably 0.08~0.15%.It is solution strengthening element, with the increase of C content, Fe3C increases therewith in steel, and hardenability further improves, and the intensity of steel improves, but elongation percentage and impact flexibility can decline, especially It is that low-temperature flexibility is had a great influence, and too high carbon content is unfavorable for the weldability of steel plate.
Si, setting range≤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 of solid solution and cold deformation hardening ratio in steel, but silicone content When higher, the easy decarburization of surface of steel plate.Meanwhile Si elements are harmful to irradiating, and should strictly control containing for non-alloyed element w (Si) Amount.
Mn, setting range 0.50~1.80%, preferably 0.80~1.60%.Good deoxidier and desulfurizing agent, and iron 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 sensitiveness, and be unfavorable for the weldability of steel plate.
Ni:Setting range 0.20~1.00%, preferably 0.30~0.80%.It is that intensity can be improved in steel, and can is effective Improve the element of toughness, particularly low-temperature flexibility.Typically add in the steel for needing higher-strength higher toughness, with reference to this implementation The intensity and toughness index of steel grade, a small amount of addition.
Cr:Setting range 0.30~0.80%, preferably 0.30~0.60%.The resistance to corrosion of steel can be increased, also right and wrong Normal effective intensified element, because this implementation steel grade intensity rank is medium, Cr elements only need to be added on a small quantity.
Cu:Setting range 0.10~0.80%, preferably 0.10~0.50%.Improve the weather-resistant of ordinary low-alloy steel Performance, while beneficial effect is produced to intensity and toughness, it is contemplated that the anti-radiation performance requirement of nuclear power steel, should strictly be controlled Cu constituent contents in steel processed.
Mo:Setting range≤0.08%, preferably 0.03~0.08%.Recrystallization temperature is significantly improved, is had obvious solid Molten reinforcing effect, improve 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:Setting range≤0.008%, preferably≤0.005%.Enter with furnace charge in steel, while liquid metal can also be from sky A part is absorbed in gas, is solid-solution in iron, solid solution is formed, solution strengthening effect can be played, but due to Fe4N precipitation, be easily caused Timeliness and blue shortness phenomenon.
Alt (total aluminium, also referred to as full aluminium):Setting range≤0.040%, preferably 0.020%~0.040%.Al is in 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 easily caused to be mingled with 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 is the impurity element being harmful in steel, although P can increase substantially intensity, easily Segregation is formed in steel, reduces the toughness and welding performance of steel, S easily forms plasticity sulfide, makes steel anisotropy serious, deteriorates The impact flexibility and processing characteristics of steel, therefore its content should be more low better, with reference to actual production controlled level, P≤0.008%, 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 control is As≤0.01%, Sn≤0.008%, Sb≤0.005%.
Invention also provides the manufacture method of foregoing ultra-thin ultra-wide steel for nuclear power pressure equipment plate, including following step Suddenly:
1) smelted by afore mentioned chemical component content and be cast as base;
2) rolled, specifically included using two fire technique of becoming a useful person:
2.1) split rolling method is implemented, 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 " fire " is in order to be distinguished with the roughing rolled after cogging, similarly hereinafter), a fiery roughing is whole 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) rolled after cogging:1200~1280 DEG C of slab heating temperature, residence time in heating furnace >=8min/ lis Rice thickness of slab, i.e., the heat time that slab thickness per cm should reach is not less than 8 minutes, if slab thickness is 100mm, the heat time 80min should be not less than;Two fiery roughing start rolling temperatures be 1180~1230 DEG C (before roughing plus " two fire " be in order to split rolling method Roughing distinguishes), 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) it is heat-treated, using normalizing process, normalizing temperature is 850~920 DEG C, and normalizing soaking time is 30~50min.
Preferably, in step 1), smelting process uses converter smelting, argon station Argon, LF heating furnaces and RH vacuum drying ovens successively Handled, and base is cast as using continuous casting process.
Preferably, in step 2.1), 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, in step 2.2), the control of finish rolling start rolling temperature at 1120~1180 DEG C, finishing temperature control 770~ 800℃。
Preferably, in step 2.2), rough rolling step uses 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 draught per pass, but under last three passages stagnation pressure Rate >=40%, last percentage pass reduction >=11%.
Preferably, in step 2.1), 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 setting described briefly below:
Smelting molten steel uses converter smelting, and casting uses continuous casting.Smelting process is refined using RH vacuum systems, 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 heats continuous casting billet, rolls, 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 is 100 × (1700~2800) × (2400~4100mm), cogging compression ratio >=3.0, in order to avoid steel plate is rolling Temperature drop is too fast during system, and cooling system is optimized, and roller-way water is all closed down, and roller repairing water water is adjusted to 120m3/ min, lower 200m3/ min, while the pressure of de-scaling water under high pressure is improved, it 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 2800~4100mm of width ultra-thin ultra-wide nuclear power pressure equipment steel plate Difficulty processed is larger, properly increases finish rolling start rolling temperature and finishing temperature, and corresponding is 1100~1180 DEG C and 700~900 DEG C respectively, Ensure that finish rolling finish to gauge rolls 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, be specially:It will roll Journey is rolled in two stages, and the first stage is declined using the big pressure rolling of high temperature, second stage with steel billet temperature, and appropriate reduction is every Reduction in pass, last three passages total reduction >=40%, finish rolling end percentage pass reduction >=11%, although increase 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 ensure 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 effectively avoid by The template problem caused by very thin wide specification steel plate temperature drop in the operation of rolling is too fast, while avoid original blank disposably continuous Rolling exceedes Wide and Thick Slab producing line length and holds loading capability.
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 soaking time to thin specification steel plate intensity into consideration Ring, normalizing temperature is set as 850~920 DEG C, normalizing soaking time is 30~50min.
The beneficial effects of the invention are as follows:Ultra-thin ultra-wide steel for nuclear power pressure equipment plate provided by the invention and its manufacturer Method, purity of steel is improved using advanced steel-smelting technology, setting is optimized to rolling technological parameter, to ensure the plate of steel plate Type, pass through appropriate Technology for Heating Processing, it is ensured that the tough matching of steel plate and high-temperature behavior, reach steel plate room temperature strength surplus capacity More than 50MPa, 300 DEG C of elevated temperature strength surplus capacities have good low-temperature impact toughness up to 45~80MPa, -60 DEG C of impacts Work(average value reaches more than 80J, and chemical composition is relatively easy, and production cost is low, gives 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.
Brief description of the drawings
Fig. 1 is the metallographic structure photo for the steel plate that embodiment 1 produces.
Embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
Limit specifications steel for nuclear power pressure equipment plate provided by the invention, its thickness are 5~12mm, width is 2800~ 4100mm, its chemical component weight percentage are: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, surplus are Fe and are inevitably mingled with.In each embodiment, comparative example, constituent content Specific value be listed in table 1.
The embodiment of the present invention of table 1 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 following steps:
1) smelt
Using Desulphurization of Pig Iron, it is (true that converter smelting, argon station Argon, LF heating furnaces and the processing of RH vacuum drying ovens are carried out successively Empty processing 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, specific split rolling method technique are:Strand tapping temperature 1240 ± 20 DEG C, fiery 1180~1230 DEG C of a roughing start rolling temperature, fiery 1080~1100 DEG C of a roughing finishing temperature, and carry out a high pressure Water de-scaling, and high-pressure water pressure is brought up 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, and finish rolling finishing temperature is 700~900 DEG C, and finish rolling rolls 7~11 passages;Rough rolling step uses 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 soaking time is 30~50min.
In each embodiment, comparative example, the specific value of technological parameter is listed in table 2, and same numbering represents same in table 1, table 2 Composition and technological parameter used by individual embodiment.
2 each embodiment of table and the main rolling of compared steel and heat treatment process parameter
The mechanics properties testing result row for the ultra-thin ultra-wide steel for nuclear power pressure equipment plate that above example, comparative example obtain In table 3.
The mechanical properties test result of the embodiment of the present invention of table 3 and comparative example
From table 1 it follows that addition alloying element content of the embodiment of the present invention is few, steel is pure, is ensureing performance Simultaneously effective reduce 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, significantly improves production efficiency;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 there is good tough matching ,- 60 DEG C of impact flexibility are excellent, it is ensured that the security that nuclear power pressure equipment uses.
Fig. 1 is the metallographic structure photo for the steel plate that embodiment 1 produces, it can be seen that steel plate is mainly uniformly tiny iron Ferritic+pearlitic structrure, banded structure degree is reduced, ensure 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 is 5~12mm, and width is 2800~4100mm, and it is special Sign is: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%;Surplus is Fe and inevitable impurity;It is made Preparation Method comprises the following steps:
1) smelted by the chemical composition content and be cast as base;
2) rolled, specifically included using two fire technique of becoming a useful person:
2.1) split rolling method is implemented, split rolling method technique is:1240 ± 20 DEG C of strand tapping temperature, a fiery roughing start rolling temperature 1180~1230 DEG C, fiery 1080~1100 DEG C of a roughing finishing temperature, and carry out a high-pressure water descaling, de-scaling high-pressure water pressure Control is in 25~48MPa;
2.2) rolled after cogging:1200~1280 DEG C of slab heating temperature, residence time >=8min/ centimetres 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) it is heat-treated, using normalizing process, normalizing temperature is 850~920 DEG C, and normalizing soaking time is 30~50min.
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%;Surplus is Fe and inevitable impurity.
3. ultra-thin ultra-wide steel for nuclear power pressure equipment plate according to claim 1 or 2, it is characterised in that:The power of the steel plate It is as follows to learn performance: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 or 2, its feature exist In:Comprise the following steps:
1) smelted by the chemical composition content and be cast as base;
2) rolled, specifically included using two fire technique of becoming a useful person:
2.1) split rolling method is implemented, split rolling method technique is:1240 ± 20 DEG C of strand tapping temperature, a fiery roughing start rolling temperature 1180~1230 DEG C, fiery 1080~1100 DEG C of a roughing finishing temperature, and carry out a high-pressure water descaling, de-scaling high-pressure water pressure Control is in 25~48MPa;
2.2) rolled after cogging:1200~1280 DEG C of slab heating temperature, residence time >=8min/ centimetres 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) it is heat-treated, using normalizing process, normalizing temperature is 850~920 DEG C, and normalizing soaking 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 handled using converter smelting, argon station Argon, LF heating furnaces and RH vacuum drying ovens successively, and uses 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 controls 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, it is special Sign is:In step 2.2), rough rolling step uses high temperature heavy reduction rolling, draught per pass >=20mm;The finish rolling stage with Steel billet temperature decline, gradually reduces draught per pass, but last three passages total reduction >=40%, 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, it is special Sign is:In step 2.1), 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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