CN108359892A - A kind of the used in nuclear power station steel and its manufacturing method of bending forming function admirable - Google Patents
A kind of the used in nuclear power station steel and its manufacturing method of bending forming function admirable Download PDFInfo
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- CN108359892A CN108359892A CN201810154710.8A CN201810154710A CN108359892A CN 108359892 A CN108359892 A CN 108359892A CN 201810154710 A CN201810154710 A CN 201810154710A CN 108359892 A CN108359892 A CN 108359892A
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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
-
- 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
-
- 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
- C22C38/04—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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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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 present invention discloses a kind of the used in nuclear power station steel and its manufacturing method of bending forming function admirable.Contain C in steel：0.10%~0.20%；Si：0.25%~0.50%；Mn：0.90%~1.60%；P≤0.01%；S≤0.01%；Ni：0.40%~0.80%；Cr：0.10%~0.50%；Mo：0.10%~0.50%；V：0.01%~0.10%；Nb：0.01%~0.10%；Alt：0.01%~0.05%, remaining is Fe and inevitable impurity；700~800 DEG C of billet heating temperature keeps the temperature 5~8h, is warming up to 1200~1250 DEG C, 5~8h of used time；It is rolled after 6~10h of heat preservation, start rolling temperature >=1100 DEG C；910 ± 20 DEG C, 2~5min/mm of soaking time of hardening heat, water cooling is to 200 DEG C or less；640 ± 20 DEG C of temperature, 1~5min/mm of soaking time.100~180mm of steel plate thickness, bending forming are functional.
Description
Technical field
The invention belongs to steel manufacturing technology fields, and in particular to thickness is the used in nuclear power station steel and its system of 100~180mm
Make method.
Background technology
Reactor containment vessel is the jumbo in nuclear power plant, and quality is big, and appearance and size is larger, accommodates all portions of reactor core
Part and the longtime running under high temperature, high pressure, radiation environment, it is non-exchange in the entire phase in longevity, ensure complete in its entire phase in longevity
Property is most important.Require Nuclear containment steel that should meet thus claimed below：(1) intensity is high, plasticity and toughness are good, Flouride-resistani acid phesphatase, corrosion resistant
Erosion is good with coolant compatibility；(2) quenching degree is good, can get the performance of the tissue and stabilization of big sectional uniform, after being run when long
Performance is stablized；(3) solderability and cold and hot working are good；(4) cost economical rationality etc..
As electricity needs further increases the continuous improvement with energy-saving and emission-reduction pressure, nuclear power has become a kind of relative maturity
Clean energy resource.Countries in the world, especially Chinese, the construction plan all in the following nuclear power generating sets of planning, nuclear power technology and construction
One development trend of planning is exactly the capacity of the single heap of continuous improvement, and the increase of single heap capacity, will inevitably be promoted anti-
Answer the enlargement of heap containment.Meanwhile from the security consideration of Nuclear containment, the fusion length of component should be reduced to the greatest extent, therefore
Another technological development direction of nuclear reactor is exactly integration and integration.The above reason directly results in nuclear reactor safety shell
Constantly increased with steel plate piece weight and thickness, this just proposes higher performance with steel to Nuclear containment and its stability is wanted
It asks.
In the existing patent of invention about such steel grade, the bending forming performance of big multipair steel plate is not paid close attention to, or is existed
The problems such as mechanical property after steel plate thickness is inadequate, intensity is low, low-temperature flexibility is poor and Simulated post-weld heat treatment is bad.Such as：
Application number 201210269122.1 discloses Thick steel plate for nuclear power plant containment and its manufacturing method, and design steel plate thickness is 10~
60mm contains C in steel：0.06%~0.15%；Si：0.1%~0.4%；Mn：1.0%~1.5%；P≤0.012%；S≤
0.003%；Ni：0.2%~0.5%；Cr≤0.25%；Mo：0.1%~0.3%；V≤0.05%；Nb≤0.03%；Ti≤
0.03%；Al：0.015%~0.05%；Ca：0.0005%~0.005%.The steel grade uses the composition design of low-carbon-equivalent,
C, the constituent contents such as Si, Ni are relatively low, can not ensure strength character when steel plate thickness reaches 100mm or more, and to steel plate
Mechanical property and bending forming performance after Simulated post-weld heat treatment are not paid close attention to.
Application number：201310076884.4 disclosing a kind of nuclear plant pressure vessels and equipment gate steel and its manufacturer
Method, in the designing chemical composition of steel, Cr, Mo content are below 0.1%, can not ensure the good quenching degree of super-thick steel plate, especially
Steel plate the obdurability after prolonged Simulated post-weld heat treatment will be poor.In addition, steel plate using normalizing or quenching+
The technique productions of tempering are related to finished steel plate low strength, also do not pay close attention to the bending forming performance of steel plate.
Invention content
The present invention provides a kind of the used in nuclear power station steel and its manufacturing method of 100~180mm thickness bending forming function admirable,
The tissue stablized with big sectional uniform by microalloy composition design, suitable heat treatment process, steel plate, higher intensity,
Excellent plasticity and toughness stretch after long-time Simulated post-weld heat treatment and the key indexes such as low-temperature impact are good, particularly through curved
After song forming, steel plate still has good low temperature impact properties.Requirement is fully met, so as to effectively ensure core
The safe operation of motor group.
Specifically technical solution is：
A kind of used in nuclear power station steel of bending forming function admirable, chemical composition are by mass percentage：C：0.10%~
0.20%；Si：0.25%~0.50%；Mn：0.90%~1.60%；P≤0.01%；S≤0.01%；Ni：0.40%~
0.80%；Cr：0.10%~0.50%；Mo：0.10%~0.50%；V：0.01%~0.10%；Nb：0.01%~
0.10%；Alt：0.01%~0.05%；Surplus is Fe and inevitable impurity.
The mechanism of action of chemical composition is as follows in the present invention：
C：It is the most effective element of reinforced structure steel, and is also most economical element.If C content is too low in steel, by force
Degree just cannot be satisfied requirement；If C content is excessively high, will all have an adverse effect to the ductility, toughness and weldability of steel, Er Qie
The welding heat affected zone of steel there is also phenomenon of hardening, and lead to the generation of welding cold cracking.Therefore the present invention claims C in steel to contain
Amount control is in the range of 0.10%~0.20%.
Si：Be it is a kind of can effective for deoxidation, Intensive intervention body and improve impact transition temperature alloying element.But
It carries high Si content and is also easy to produce Silicate inclusion, damage the welding performance of steel plate, therefore the present invention controls Si contents
0.25%~0.50%.
Mn：Solution strengthening effect is played in steel, can improve the intensity and hardness of steel plate, and manganese is the member of stable austenite
Element can reduce the phase transition temperature of austenite, promote dissolving of the carbon in austenite, due to delaying the shape of ferrite, pearlite
At to expand the range for the cooling rate for being cooled into martensite, bainite structure, improving the quenching degree of steel.Excessively
Manganese be easy to be segregated, deteriorate the performance of steel.Therefore the present invention controls Mn contents 0.90%~1.60%.
P：A kind of element of damage low-temperature flexibility, therefore the lower the content of phosphorus the better, but in view of steel-making condition and at
This, the present invention claims the P contents in control steel to be not higher than 0.01%.
S：Sulphide inculsion is easily formed in steel, reduces the impact flexibility of steel, damages welding performance, while it is inclined to aggravate center
The defects of analysing, be loose, and radiation embrittlement can be increased, therefore the present invention claims S≤0.01%.
Ni：It is non-carbide former, the effect of solution strengthening is primarily served in steel, the quenching degree of steel can be improved,
Substantially change the low-temperature flexibility of steel, with chromium, molybdenum etc. with the use of when, structural steel can be made to obtain strength and toughness after heat treatment and matched
Close good comprehensive mechanical property.But experiment proves nickelic bigger than low nickel radiation embrittlement.Therefore from actual needs, the present invention
It is 0.40%~0.80% to control Ni contents in steel.
Cr：The antioxygenic property of steel can be improved, increases corrosion resistance, while reducing austenite phase field, improves the quenching degree of steel
Energy.But too high levels can significantly improve the brittle transition temperature of steel, promote temper brittleness, therefore the present invention claims Cr in steel to contain
Amount control is 0.10%~0.50%.
Mo：Mainly extend austenite in steel and change the incubation time, is moved after making ferrite, perlitic transformation, improve steel
Quenching degree, when slab being made to quench steel plate core in the case where cooling rate is relatively slow also can through hardening, while molybdenum is strong carbide
Formation element forms compound cementite when content is relatively low, and can improve heat resistance and reduce temper brittleness.Therefore, originally
Invention requires to control Mo contents 0.10%~0.50%.
V、Nb：It is strong carbide and nitride forming element in steel, crystal grain thinning improves grain coarsening temperature, from
And reduce the superheated susceptivity of steel.Midium-carbon steel requirement is fine-grained steel, and fine-grained steel is than coarse-grained steel radiation embrittlement sensibility
It is small.And the addition of excess V, Nb will deteriorate the toughness of welding heat affected zone, therefore the content control of V, Nb are V by the present invention：
0.01%~0.10%, Nb：0.01%~0.10%.
Alt：Aluminium plays certain deoxidation in steel-making, also helps crystal grain thinning.But excessive aluminium not only acts on
Effect unobvious, but also cost can be increased, generate Al2O3It is mingled with, influences hot-working character, the welding performance of steel.So this hair
It is bright to require AltContent is controlled 0.01%~0.05%.
The invention further relates to the manufacturing methods of the used in nuclear power station steel of bending forming function admirable, including smelting, casting, heat
It rolls, be heat-treated.
When billet-charging heats, in-furnace temperature is controlled at 700~800 DEG C, after keeping the temperature 5~8h, is warming up to 1200~1250
DEG C, heat up 5~8h of used time；It is rolled after keeping the temperature 6~10h at 1200~1250 DEG C, de-scaling before rolling, it is ensured that iron scale removes
Only.Rear offline carry out stacking slow cooling is rolled in start rolling temperature >=1100 DEG C.
Heat treatment process：910 ± 20 DEG C of hardening heat, soaking time are 2~5min/mm, ensure steel plate internal and external temperature one
It causes, forms single uniform austenite structure, water cooling is until steel billet temperature is down to 200 DEG C or less immediately after.
640 ± 20 DEG C, 1~5min/mm of soaking time of temperature ensures the abundant precipitation of carbide, is formed uniformly steady
Fixed bainite tempered structure makes steel plate have good comprehensive mechanical property.
Advantageous effect：
The present invention provides the used in nuclear power station steel and its manufacturing method of bending forming function admirable, compared with prior art,
It has the beneficial effect that：
The present invention controls gas and non-metallic inclusion content in steel by using the rational proportion of chemical composition, and
Using suitable heating, rolling and heat treatment process, the used in nuclear power station of 100~180mm thickness bending forming function admirables is produced
Steel plate, steel plate have a bainite tempered structure that big sectional uniform is stablized, higher intensity (Rm ＞ 650MPa) and excellent low
Warm toughness (- 7 DEG C of KV8＞ 220J), and after long-time Simulated post-weld heat treatment, the passes such as steel plate stretching and low-temperature impact
Key index keeps good.Especially steel plate after bending forming, still has (- 7 DEG C of impacts of uniform and stable low-temperature flexibility
Work(＞ 220J, -25 DEG C of fracture toughnesses are good).
Description of the drawings
Fig. 1 is the metallographic structure of embodiment 1, and bainite tempered structure is organized as in figure.
Specific implementation mode
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.
Table 1 is embodiment steel smelting chemical composition；Table 2 is heating and the rolling mill practice of embodiment steel plate；Table 3 is embodiment
The heat treatment process of steel plate；Table 4 is the mechanical property of embodiment steel；It is sampled from each embodiment steel plate, carries out simulation postwelding respectively
Heat treatment, Simulated post-weld heat treatment temperature are 625 DEG C, and 400 DEG C or more temperature rates are 100 DEG C/h, soaking time 15h.
Table 5 is the mechanical property of steel plate after embodiment steel Simulated post-weld heat treatment.
1 each embodiment steel smelting chemical composition (wt%) of table
| Embodiment | C | Si | Mn | P | S | Ni | Cr | Mo | V | Nb | Alt |
| 1 | 0.16 | 0.36 | 1.34 | 0.007 | 0.005 | 0.55 | 0.11 | 0.27 | 0.025 | 0.090 | 0.026 |
| 2 | 0.13 | 0.25 | 1.19 | 0.006 | 0.004 | 0.79 | 0.43 | 0.31 | 0.064 | 0.052 | 0.033 |
| 3 | 0.15 | 0.29 | 1.28 | 0.004 | 0.003 | 0.60 | 0.39 | 0.34 | 0.083 | 0.036 | 0.040 |
| 4 | 0.18 | 0.47 | 1.43 | 0.006 | 0.004 | 0.73 | 0.29 | 0.15 | 0.057 | 0.072 | 0.037 |
| 5 | 0.20 | 0.42 | 0.93 | 0.005 | 0.003 | 0.48 | 0.48 | 0.41 | 0.055 | 0.068 | 0.027 |
| 6 | 0.11 | 0.26 | 1.60 | 0.007 | 0.004 | 0.40 | 0.27 | 0.50 | 0.076 | 0.057 | 0.024 |
2 each embodiment steel of table heats and rolling mill practice
3 each embodiment steel heat treatment process of table
4 each embodiment steel mechanical property of table
Mechanical property of steel plate after 5 each embodiment steel Simulated post-weld heat treatment of table
Cut bending forming sample from embodiment steel plate, after 4% strain rate bending forming, carry out quenched and tempered state, it is quenched+
Simulated post-weld heat treatment state is impacted and drop weight test.Simulated post-weld heat treatment temperature is 625 DEG C, 400 DEG C or more temperature rates
For 100 DEG C/h, soaking time 15h；The mechanical property of steel plate is shown in Table 6 after embodiment steel bending forming.
The mechanical property of steel plate after 6 bending forming of table
By Biao Ke get, used in nuclear power station steel plate produced by the invention still there is excellent low temperature to rush after bending forming
Hit toughness and fracture toughness.
Claims (3)
1. a kind of used in nuclear power station steel of bending forming function admirable, which is characterized in that chemical composition is by mass percentage in steel：
C：0.10%~0.20%；Si：0.25%~0.50%；Mn：0.90%~1.60%；P≤0.01%；S≤0.01%；Ni：
0.40%~0.80%；Cr：0.10%~0.50%；Mo：0.10%~0.50%；V：0.01%~0.10%；Nb：0.01%
~0.10%；Alt：0.01%~0.05%, remaining is Fe and inevitable impurity.
2. a kind of used in nuclear power station steel of bending forming function admirable as described in claim 1, which is characterized in that steel plate thickness is
100~180mm.
3. a kind of manufacturing method of the used in nuclear power station steel of bending forming function admirable as claimed in claim 1 or 2, the life of steel plate
Production. art is：Smelting-casting-hot rolling-heat treatment, which is characterized in that
When billet-charging heats, in-furnace temperature is controlled at 700~800 DEG C, after keeping the temperature 5~8h, is warming up to 1200~1250 DEG C, is risen
Warm 5~8h of used time；It is rolled after keeping the temperature 6~10h at 1200~1250 DEG C, de-scaling before rolling, start rolling temperature >=1100 DEG C are rolled
Offline carry out stacking slow cooling afterwards；
When steel plate is heat-treated, 910 ± 20 DEG C of hardening heat, soaking time is 2~5min/mm, and water cooling is until steel plate immediately after
Temperature is down to 200 DEG C or less；640 ± 20 DEG C of temperature, 1~5min/mm of soaking time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810154710.8A CN108359892A (en) | 2018-02-23 | 2018-02-23 | A kind of the used in nuclear power station steel and its manufacturing method of bending forming function admirable |
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| CN201810154710.8A CN108359892A (en) | 2018-02-23 | 2018-02-23 | A kind of the used in nuclear power station steel and its manufacturing method of bending forming function admirable |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111270144A (en) * | 2020-03-19 | 2020-06-12 | 鞍钢股份有限公司 | High-strength steel plate for pressurized water reactor nuclear power station safety shell barrel and manufacturing method thereof |
| CN111270145A (en) * | 2020-03-19 | 2020-06-12 | 鞍钢股份有限公司 | Ultra-thick high-strength steel plate for nuclear power station containment penetration piece and production method thereof |
| CN111270143A (en) * | 2020-03-19 | 2020-06-12 | 鞍钢股份有限公司 | Thick steel plate for nuclear power station containment equipment module and production method thereof |
| CN111363985A (en) * | 2020-03-19 | 2020-07-03 | 鞍钢股份有限公司 | Steel for supporting nuclear power station containment vessel and manufacturing method thereof |
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| CN102952999A (en) * | 2011-08-19 | 2013-03-06 | 鞍钢股份有限公司 | Nuclear power station low-pressure heater steel and its making method |
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| CN107287500A (en) * | 2016-03-31 | 2017-10-24 | 鞍钢股份有限公司 | A kind of pressurized-water reactor nuclear power plant safety injection tank substrate steel and its manufacture method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN111270144A (en) * | 2020-03-19 | 2020-06-12 | 鞍钢股份有限公司 | High-strength steel plate for pressurized water reactor nuclear power station safety shell barrel and manufacturing method thereof |
| CN111270145A (en) * | 2020-03-19 | 2020-06-12 | 鞍钢股份有限公司 | Ultra-thick high-strength steel plate for nuclear power station containment penetration piece and production method thereof |
| CN111270143A (en) * | 2020-03-19 | 2020-06-12 | 鞍钢股份有限公司 | Thick steel plate for nuclear power station containment equipment module and production method thereof |
| CN111363985A (en) * | 2020-03-19 | 2020-07-03 | 鞍钢股份有限公司 | Steel for supporting nuclear power station containment vessel and manufacturing method thereof |
| CN111270143B (en) * | 2020-03-19 | 2021-07-09 | 鞍钢股份有限公司 | Thick steel plate for nuclear power station containment equipment module and production method thereof |
| CN111270144B (en) * | 2020-03-19 | 2021-12-24 | 鞍钢股份有限公司 | High-strength steel plate for pressurized water reactor nuclear power station safety shell barrel and manufacturing method thereof |
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