CN108950387A - With excellent high performance think gauge nuclear power safety injection tank steel and its manufacturing method - Google Patents
With excellent high performance think gauge nuclear power safety injection tank steel and its manufacturing method Download PDFInfo
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- CN108950387A CN108950387A CN201810717819.8A CN201810717819A CN108950387A CN 108950387 A CN108950387 A CN 108950387A CN 201810717819 A CN201810717819 A CN 201810717819A CN 108950387 A CN108950387 A CN 108950387A
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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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/06—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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The present invention is disclosed with excellent high performance think gauge nuclear power safety injection tank steel and its manufacturing method.Contain C:0.14%~0.20%, Si:0.10%~0.60%, Mn:0.30%~0.40%, P≤0.008%, S≤0.002%, Mo:0.30%~0.60%, Ni:0.45%~0.90%, Cr:0.50%~0.80%, Cu≤0.05%, Al in steelt≤ 0.04%, H≤0.00015%, O≤0.0020%, remaining is Fe and inevitable impurity.Heating Steel Ingots keep the temperature > 2h, the compression ratio > 3:1 of steel plate, start rolling temperature >=1100 DEG C, finishing temperature >=920 DEG C, 1.0~1.5m/s of mill speed to 1150~1350 DEG C；850~925 DEG C of hardening heat, 1~4min/mm of soaking time；630~670 DEG C of tempering temperature, 3~7min/mm of soaking time.For 80~150mm thick steel plates after Tempering and Quenching and 16 hour Simulated post-weld heat treatments, comprehensive mechanical property is good.
Description
Technical field
The invention belongs to ferrous material, in particular to a kind of nuclear power safety injection tank with excellent high tensile property is used
Steel and manufacturing method.
Background technique
Nuclear power safety injection tank is a kind of sophisticated equipment for injecting cooling water to accident equipment when accident occurs for nuclear power station, peace note
Case memory boron water, upper cavity fills nitrogen, when reactor coolant loop pressure drops to safety injection tank pressure or less, by nitrogen
Cold section of boron water piii reactor coolant system can be flooded reactor core in a short time, fuel rod is avoided to melt by atmospheric pressure, from
And guarantee the safety and integrality of reactor system.Its manufacture requires very strict, process control and its harshness, acceptance
Program is quite tight.Currently, safety injection tank end socket and cylinder steel plate almost all depend on import, it is expensive, and delivery date
It is long.Be primarily present following two aspect problem: first is that according to plate design requirement, end socket and cylinder board belong to ultra-wide former (plate
Width 4.5m), therefore have strict demand to the equipment and ability of manufacturing factory；Second is that steel plate pass through up to 16 hours with
On Simulated post-weld heat treatment after, armor plate strength is decreased obviously, and the tensile strength of especially 150 DEG C drawing by high temperature is wanted lower than index
It asks, but is limited to inlet plate, it has to reduce index.
CN201410098857.1 entitled " a kind of nuclear plant pressure vessels steel plate and its manufacturing method ", essentially discloses
A kind of nuclear plant pressure vessels steel and its manufacturing method, the steel plate include: 0.10%~0.20% C, 0.15%~
0.40% Si, 0.60%~1.40% Mn, P≤0.020%, S≤0.010%, Ni≤0.30%, Cu≤0.18%, Cr
≤ 0.30%, Mo≤0.08%, V≤0.020%, Nb≤0.020%, 0.008%~0.030% Ti, 0.020%~
0.050% Alt, N≤0.012%, Ni+Cu+Cr+Mo≤0.70%, remaining is Fe and inevitable impurity.Steel plate tool
There are good low-temperature flexibility and high temperature resistance, welding performance, cold and hot working function admirable are stablized, and Flouride-resistani acid phesphatase embrittlement performance is good
It is good, it is at low cost.But the constituent contents such as C, Ni, Mo are relatively low in invention ingredient design, and use normalizing heat treatment or controlled rolling side
Formula production, causes the armor plate strength of design lower, and does not pay close attention to the performance that steel plate passes through long-time Simulated post-weld heat treatment.
CN201210387824.X entitled " 18MND5 nuclear power low-alloy structural steel and process control method ", discloses one
Kind 18MND5 nuclear power low-alloy structural steel and process control method.Chemical component group including following weight degree
At: C≤0.22%, 0.10%~0.30% Si, 1.15%~1.60% Mn, S≤0.012%, P≤0.012%, Al
≤ 0.04%, 0.43%~0.57% Mo, Cu≤0.08%, 0.50%~0.80% Ni, V≤0.01%, N≤
0.008%, H≤1.5ppm, O≤30ppm, N≤0.013%, Cr≤0.25%, Co≤0.08%, B≤0.0018%, As≤
0.010%, Sb≤0.002%, Sn≤0.010%, remaining is Fe and inevitable impurity.The 18MND5 of invention production
The mechanical property of material is substantially better than other steel grades, can be used as nuclear power pressure 18MND5 high-strength low-alloy structural steel.On
Patent is stated using electric furnace smelting-forging-heat treatment process, rhythm of production is low, and the production cycle is long, is not suitable for continuous high-volume
Production, and in embodiment without being clearly applicable in steel plate thickness scope.
CN201010276502.9 entitled " a kind of nuclear reactor safety shell end socket and cylinder steel ", it is anti-to disclose a seed nucleus
Answer heap containment end socket and cylinder steel, chemical component weight percentage are as follows: C≤0.20%, 0.15%~0.55% Si,
0.90%~1.60% Mn, P≤0.025%, S≤0.025%, Ni≤0.60%, Cr≤0.30%, Mo≤0.30%, Nb
≤ 0.04%, V≤0.07%, Cu≤0.35%, V+Nb≤0.08%, remaining content is Fe and inevitable impurity, in steel
Carbon equivalent is 0.40%~0.44%, and carbon equivalent calculation formula is CE=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15, control
Nonmetallic inclusionsin steel processed, A, B, C, D class are mingled with≤1.5 grades.The invention effectively guarantees that steel plate has higher-strength simultaneously,
Also there is uniform and stable toughness, especially after the processing of long-time stress-removal, the intensity of steel plate will not obtain it is obvious under
Drop, still can satisfy index request.The inventive embodiments light plate is with a thickness of 42mm, and thicker steel plate is not recorded, and mould
The quasi- post weld heat treatment time is relatively short, does not also refer to drawing by high temperature index situation.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of think gauge cores with excellent high performance
Electric safety injection tank steel and manufacturing method, steel plate thickness up to 80~150mm, by rationally control the chemical element content in steel,
The content of gas and non-metallic inclusion in steel is reduced, can effectively guarantee that steel plate has excellent comprehensive mechanical property, especially
It is steel plate after 16h Simulated post-weld heat treatment, and 150 DEG C of drawing by high temperature and -50 DEG C of low-temperature impact indexs still can be complete
Meet nuclear power safety injection tank device fabrication requirement.
Specific technical solution is:
Think gauge nuclear power safety injection tank steel with excellent high performance includes following component: C by mass percentage:
0.14%~0.20%, Si:0.10%~0.60%, Mn:0.30%~0.40%, P≤0.008%, S≤0.002%, Mo:
0.30%~0.60%, Ni:0.45%~0.90%, Cr:0.50%~0.80%, Cu≤0.05%, Alt≤ 0.04%, H
≤ 0.00015%, O≤0.0020%, remaining content are Fe and inevitable impurity.
It is as follows using mentioned component design reason:
C: it is the essential element for guaranteeing armor plate strength, the intensity and harden ability of steel can be effectively improved, but simultaneously
Plasticity, toughness and the weldability of steel are reduced, is 0.14%~0.20% the present invention claims C content therefore.
Si: being the intensified element in steel, is conducive to the intensity for improving steel plate, but Si too high levels can damage the low temperature of steel plate
Toughness, and will increase irradiation brittleness, therefore should the control of Si content is good within the range having a lower limit of, Si control of element is by the present invention
0.10%~0.60%.
Mn:Mn can not only strengthen matrix in steel, can also effectively improve the harden ability of steel plate, and at low cost
It is honest and clean, but Mn too high levels will increase steel belt roof bolt brittleness sensibility, and crystal grain is made to have the tendency that roughening, therefore the present invention claims
The control of Mn content is 0.30%~0.40% in steel.
P and S: being harmful element in steel, and P can aggravate the generation of center segregation and center porosity, the vulcanization that S is formed in steel
It is very unfavorable to the impact flexibility and welding performance of steel that object is mingled with, and therefore, it is necessary to their content is more lower better.By P in the present invention
Content control is P≤0.008%, and the control of S content is S≤0.002%.
Mo: can be improved the harden ability and heat resistance of steel plate, can also reduce or inhibit back with Cr, Mn element collective effect
Fiery brittleness, therefore the present invention controls the content of Mo 0.30%~0.60%.
Ni: can be obviously improved the low-temperature flexibility of steel plate, while improve the harden ability of steel plate, but Ni can reduce the A3 of steel
Line temperature so that irradiation effect increases, therefore is 0.45%~0.90% the present invention claims Ni content control in steel.
Cr: the anti-oxidant and resistance to corrosion of steel can be significantly improved, and the harden ability of steel plate can be improved, but Cr can also
It significantly improves the brittle transition temperature of steel, promotes temper brittleness, therefore the present invention claims Cr content controls in steel for 0.50%~
0.80%.
Cu:Cu is to reduce the mechanical performance of steel, and lead to metal when heated radiation embrittlement element the most harmful
The oxidation on surface influences the quality of steel.Therefore usually require that the Cu content in midium-carbon steel should be not higher than 0.05%.
Alt: Al is common deoxidier in steel, can refine crystal grain, and improves the impact flexibility of steel plate, but Al content
It is excessively high, can inclusion content be increased, influence the weldability of steel plate, therefore the present invention claims Al in steeltContent control for≤
0.04%.
H and O:H and O is harmful to the performance of steel, will increase radiation embrittlement effect, therefore the lower their content the better,
The present invention claims H≤0.00015% in steel, O≤0.0020%.
The manufacturing method of nuclear power safety injection tank steel, including smelting, casting, heating, rolling, heat treatment realize that the present invention exists
Following technical measures are taken in production technology:
It smelts and rolls: being handled using Deep Desulphurization of Hot Metal, electric furnace smelting, LF, VD external refining are carried out after tapping, later
It is poured.Steel ingot is heated to 1150~1350 DEG C in batch-type furnace, and cogging, intermediate base slow cooling solution are carried out after soaking time > 2h
It is rolled after pile, is effectively ensured the compression ratio > 3:1 of finished steel plate, start rolling temperature >=1100 DEG C, finishing temperature >=920 DEG C,
Mill speed is controlled in 1.0~1.5m/s, natural stacking slow cooling after rolling.
Heat treatment: carrying out Tempering and Quenching using quenching+tempering mode, obtains that crystal grain is tiny, uniform tissue.Quenched heat
Treatment process are as follows: 850~925 DEG C of hardening heat, 1~4min/mm of soaking time；630~670 DEG C of tempering temperature, soaking time
3~7min/mm can obtain returning for tiny crystal grain, even tissue, toughness height and moderate strength by sufficient tempering time
Fiery bainite, and the internal stress of steel plate can be further eliminated, while the carbide that the alloying elements such as Mo, V are formed can be precipitated,
The effect of precipitation strength is increased, to make steel plate that there is enough toughness.
The utility model has the advantages that
The present invention provides a kind of think gauge nuclear power safety injection tank steel and manufacturing method with excellent high performance, production
Steel plate thickness be 80~150mm, width and length can be produced according to actual needs.Compared with prior art, beneficial to effect
Fruit is as follows:
(1) steel plate thickness of the invention is 80~150mm, using steel ingot cogging Rolling Production, passes through alloy in control steel
Element reduces gas content and non-metallic inclusion content, can obtain the finished product of the maximum gauge 150mm of compression ratio > 3:1
Steel plate, and make steel plate that there are excellent high temperature tensile properties and toughness, wherein 80~150mm finished product quenched and tempered state steel plate 150
DEG C drawing by high temperature yield strength can achieve 500~530MPa, and tensile strength can achieve 610~635MPa, by being up to 16
After a hour Simulated post-weld heat treatment, 150 DEG C of drawing by high temperature yield strengths of steel plate can achieve 500~520MPa, and tension is strong
Degree can achieve 610~625MPa, and under two states, between the reachable 185~277J of -50 DEG C of impact flexibility of steel plate energy,
The contraction percentage of area is up to 60~85%.
(2) the conditioned heat treatment of steel grade of the present invention has under different conditions with after the Simulated post-weld heat treatment of 16 hours
There is preferable strength level.150 DEG C of drawing by high temperature yield strengths and tensile strength point after the conditioned processing of 120mm thick steel plates
It Wei not 529MPa and 635MPa；After Simulated post-weld heat treatment, 150 DEG C of drawing by high temperature yield strengths and tensile strength are respectively
509MPa and 614MPa, from the results of view, 150 DEG C of high temperature tensile strengths of steel plate of different conditions have compared with other steel grades larger
Ground is promoted.
(3) impact absorbing energy and cross-section fiber rate of the steel grade of the present invention under different conditions are equally maintained at higher water
It is flat.- 50 DEG C of impact absorbing energy after the conditioned processing of 120mm steel plate and Simulated post-weld heat treatment are in 200J or more, section
Fiber rate can reach 65% or more, show that steel grade of the present invention has good low-temperature flexibility.
(4) the Z-direction contraction percentage of area of steel grade of the present invention has higher level, and 120mm steel plate is conditioned, and treated that Z-direction is disconnected
Face shrinking percentage can achieve 67.3%, show that steel grade of the present invention has preferable anti-lamellar tearing ability.
(5) present invention is by selecting low P, low S molten iron, and to carry out Deep Desulphurization of Hot Metal processing, and desulfurization slag scratches clean, electric furnace smelting
Refining, external refining, vacuum processing and rolling mill practice are produced, so ensure that the cleanliness of molten steel is higher.
Detailed description of the invention
Fig. 1 is the metallographic structure of embodiment 3；Microscopic structure is tempering bainite.
Specific embodiment
For following embodiment for illustrating the content of present invention, these embodiments are only the general description of the content of present invention,
The content of present invention is not limited.
The smelting chemical ingredient of various embodiments of the present invention steel is as shown in table 1；
Each embodiment steel smelting chemical component mass% of table 1
| Embodiment | C | Si | Mn | P | S | Mo | Ni | Cr | Cu | AlT | H | O |
| 1 | 0.16 | 0.10 | 0.30 | 0.005 | 0.0009 | 0.42 | 0.50 | 0.55 | 0.017 | 0.016 | 0.00010 | 0.0019 |
| 2 | 0.14 | 0.30 | 0.40 | 0.008 | 0.0009 | 0.55 | 0.75 | 0.60 | 0.015 | 0.028 | 0.00015 | 0.0016 |
| 3 | 0.18 | 0.28 | 0.35 | 0.006 | 0.0010 | 0.50 | 0.62 | 0.78 | 0.016 | 0.030 | 0.00008 | 0.0018 |
| 4 | 0.20 | 0.40 | 0.32 | 0.004 | 0.0007 | 0.35 | 0.55 | 0.70 | 0.018 | 0.025 | 0.00009 | 0.0020 |
| 5 | 0.15 | 0.55 | 0.36 | 0.005 | 0.0010 | 0.48 | 0.65 | 0.66 | 0.012 | 0.020 | 0.00009 | 0.0015 |
Molten steel is cast into steel ingot through electric furnace smelting, external refining, vacuum processing, and mill product steel plate specification is 80~
150mm.Simulated post-weld heat treatment technique is 615 ± 5 DEG C of temperature, soaking time 16h, 400 DEG C or more temperature rate≤55 DEG C/
h。
The rolling mill practice of various embodiments of the present invention steel is as shown in table 2, each embodiment Heat-Treatment of Steel is as shown in table 3；This hair
150 DEG C of high temperature tensile properties of bright each embodiment steel plate are as shown in table 4；- 50 DEG C of impact properties of various embodiments of the present invention steel plate
As shown in table 5；The Z-direction of various embodiments of the present invention steel plate stretches and cold bending test performance is as shown in table 6.
2 rolling mill practice of table
3 heat treatment process of table
Table 4 steel plate, 150 DEG C of high temperature tensile properties results
- 50 DEG C of impact property results of 5 steel plate of table
6 steel plate Z-direction of table stretches and cold bending test results of property
After Tempering and Quenching and 16 hour Simulated post-weld heat treatments, steel plate has 80~150mm thick steel plates
The requirement for meeting nuclear power safety injection tank device fabrication is fully achieved in good comprehensive mechanical property, performance indexes.
Claims (3)
1. one kind has excellent high performance think gauge nuclear power safety injection tank steel, which is characterized in that chemical component presses quality in steel
Percentage are as follows: C:0.14%~0.20%, Si:0.10%~0.60%, Mn:0.30%~0.40%, P≤0.008%, S≤
0.002%, Mo:0.30%~0.60%, Ni:0.45%~0.90%, Cr:0.50%~0.80%, Cu≤0.05%, Alt
≤ 0.04%, H≤0.00015%, O≤0.0020%, remaining is Fe and inevitable impurity；By Simulated post-weld heat treatment
Afterwards, 150 DEG C of drawing by high temperature tensile strength of steel plate can achieve 610~625MPa, and -50 DEG C of impact flexibility are broken up to 185~277J
Face shrinking percentage is up to 60~85%.
2. having excellent high performance think gauge nuclear power safety injection tank steel as described in claim 1, which is characterized in that steel plate is thick
Degree is 80~150mm.
3. a kind of production method as claimed in claim 1 or 2 with excellent high performance think gauge nuclear power safety injection tank steel,
The production technology of steel plate are as follows: smelt, casting, heating, rolling, heat treatment, which is characterized in that
It is handled using Deep Desulphurization of Hot Metal, electric furnace smelting, LF, VD external refining is carried out after tapping, is poured later；Heating Steel Ingots
To 1150~1350 DEG C, soaking time > 2h, cogging is carried out after heat preservation, is rolled after intermediate base slow cooling un-heaping, finished steel plate
Compression ratio > 3:1, start rolling temperature >=1100 DEG C, finishing temperature >=920 DEG C, mill speed control in 1.0~1.5m/s, after rolling
Natural stacking slow cooling；
Tempering and Quenching is carried out using quenching+tempering mode, 850~925 DEG C of hardening heat, 1~4min/mm of soaking time；It returns
630~670 DEG C of fiery temperature, 3~7min/mm of soaking time.
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| CN111394547A (en) * | 2020-03-19 | 2020-07-10 | 鞍钢股份有限公司 | Ultra-thick high-strength steel for nuclear reactor containment vessel and manufacturing method thereof |
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| CN111020405A (en) * | 2019-11-25 | 2020-04-17 | 鞍钢股份有限公司 | High-strength steel plate for pressurized water reactor nuclear power station containment shell head and manufacturing method thereof |
| CN111394547A (en) * | 2020-03-19 | 2020-07-10 | 鞍钢股份有限公司 | Ultra-thick high-strength steel for nuclear reactor containment vessel and manufacturing method thereof |
| CN111394547B (en) * | 2020-03-19 | 2022-05-17 | 鞍钢股份有限公司 | Ultra-thick high-strength steel for nuclear reactor containment vessel and manufacturing method thereof |
| CN116536570A (en) * | 2023-05-21 | 2023-08-04 | 襄阳金耐特机械股份有限公司 | G26CrMo4 cast steel without casting crack and application thereof |
| CN116536570B (en) * | 2023-05-21 | 2024-04-12 | 襄阳金耐特机械股份有限公司 | G26CrMo4 cast steel without casting crack and application thereof |
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