CN108677095A - A kind of high tough steels for pressure vessel use of nuclear power station and its manufacturing method - Google Patents

A kind of high tough steels for pressure vessel use of nuclear power station and its manufacturing method Download PDF

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Publication number
CN108677095A
CN108677095A CN201810896988.2A CN201810896988A CN108677095A CN 108677095 A CN108677095 A CN 108677095A CN 201810896988 A CN201810896988 A CN 201810896988A CN 108677095 A CN108677095 A CN 108677095A
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China
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steel
temperature
steel plate
nuclear power
pressure vessel
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CN201810896988.2A
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Chinese (zh)
Inventor
颜秉宇
胡海洋
王爽
孙殿东
王勇
李叶忠
欧阳鑫
隋松言
李黎明
段江涛
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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Priority to CN201810896988.2A priority Critical patent/CN108677095A/en
Publication of CN108677095A publication Critical patent/CN108677095A/en
Pending legal-status Critical Current

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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
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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
    • C22C38/18—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
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron

Abstract

The present invention provides a kind of high tough steels for pressure vessel use of nuclear power station and its manufacturing method, the steel chemical composition mass percent are as follows：C：0.10%~0.19%, Si：0.20%~0.45%, Mn：0.40%~1.30%, P≤0.010%, S≤0.003%, Cr：0.35%~0.65%, Ni：0.30%~0.60%, Mo：0.35%~0.50%, V≤0.04%, B≤0.005%, Ti≤0.010%, remaining content are Fe and inevitable impurity, pass through stringent chemical composition and process design, so that delivery state steel plate is reached good toughness and strength matching, disclosure satisfy that the requirement of technical indicator；The especially steel plate stretching performance of Simulated post-weld heat treatment state and 350 DEG C of conditions of high temperature keeps higher level, fully meets requirements of the requirement of nuclear plant pressure vessels steel.

Description

A kind of high tough steels for pressure vessel use of nuclear power station and its manufacturing method
Technical field
The present invention relates to technical field of ferrous metallurgy, more particularly to the high tough steels for pressure vessel use of a kind of nuclear power station and its system Make method.
Background technology
Currently, there is more than 70 country or just in planned development nuclear power in the world.Nuclear Safety link on the whole From the point of view of, the pressure vessel for filling nuclear fuel can be described as the heart of entire nuclear power plant, the even more most important thing of Nuclear Safety, be industry The embodiment of field sophisticated technology.It is nuclear power plant that design of pressure vessels teacher, which tells that Chinese industrial reports reporter, nuclear reactor pressure container, The importance of the equipment in bosom, Technology design is its safety.Ensure the safety of nuclear power station, it is most crucial to ensure to press The safety of force container, if pressure vessel safety, nuclear power plant is it may be said that be exactly safety.
China's nuclear power is monopolized by foreign countries for many years, keeps the main equipment for being that nuclear power station in check --- and pressure vessel etc. manufactures skill Art is difficult to realize domesticize, and now with the fast development of domestic steel industry, the manufacturing of nuclear pressure container steel plate is Through being fully able to domesticize, demand of this patent by designing unit to nuclear pressure container Steel Properties, and then in alloy member Plain aspect is designed, then coordinates suitable rolling and heat treatment process, to ensure performance of the steel plate under different conditions It meets the requirements.
Invention content
In order to solve the problems, such as described in background technology, the present invention provides a kind of high tough steels for pressure vessel use of nuclear power station and Its manufacturing method makes delivery state steel plate reach good toughness and intensity by stringent chemical composition and process design Matching, disclosure satisfy that the requirement of technical indicator；The especially steel plate stretching of Simulated post-weld heat treatment state and 350 DEG C of conditions of high temperature Performance keeps higher level, fully meets requirements of the requirement of nuclear plant pressure vessels steel.
In order to achieve the above object, the present invention is realized using following technical scheme：
A kind of high tough steels for pressure vessel use of nuclear power station, the steel chemical composition mass percent are as follows：C：0.10%~ 0.19%, Si：0.20%~0.45%, Mn：0.40%~1.30%, P≤0.010%, S≤0.003%, Cr：0.35%~ 0.65%, Ni：0.30%~0.60%, Mo：0.35%~0.50%, V≤0.04%, B≤0.005%, Ti≤0.010%, Remaining content is Fe and inevitable impurity, unit：Wt%.
For a kind of manufacturing method of the high tough steels for pressure vessel use of nuclear power station, including：
(1) smelting process：It is produced using converter smelting, external refining, vacuum processing and continuous casting process；Molten steel is in temperature Degree carries out vacuum outgas when reaching 1550 DEG C -1570 DEG C；
(2) rolling mill practice：1200 DEG C -1250 DEG C of billet heating temperature, total deformation >=67%, average pass deformation >= 15%；Start rolling temperature：1150 DEG C -1200 DEG C, finishing temperature：≥1000℃；
(3) heat treatment process：Steel plate carries out stacking slow cooling after rolling, and modifier treatment is carried out to steel plate after slow cooling；
Quenching treatment：890 DEG C~920 DEG C, soaking time 2-3min/mm reaches the complete austenitizing temperature of steel plate, fills Code insurance temperature, after coming out of the stove immediately water cooling until steel billet temperature is to 100 DEG C or less；
Temper：630 DEG C~660 DEG C, soaking time 4-6min/mm is fully kept the temperature in the temperature range, is ensured in steel Carbide Precipitation, and form high tempering Soxhlet body tissue.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) steel grade of the present invention is conditioned with after Simulated post-weld heat treatment, and preferable obdurability water is all had under two states It is flat.Yield strength and tensile strength are respectively 600MPa and 752MPa after the conditioned processing of 80mm steel plates；Simulated post-weld heat treatment Afterwards, yield strength and tensile strength are respectively 566MPa and 687MPa (index request yield strength >=530MPa, tensile strength: 680~780MPa), from the results of view, armor plate strength fall is smaller, and different conditions can meet index request, compared with Other steel grades, which have, significantly to be improved.
(2) 350 DEG C high temperature tensile properties of the steel grade of the present invention under different conditions are equally maintained at higher level.80mm The yield strength and tensile strength of 350 DEG C of drawing by high temperature are respectively 531MPa and 637MPa after the conditioned processing of steel plate；Simulation weldering After being heat-treated afterwards, 350 DEG C of drawing by high temperature yield strengths and tensile strength are respectively that (index request surrender is strong by 512MPa and 621MPa Degree >=450MPa, tensile strength >=580MPa), from the results of view, the high temperature tensile properties of steel plate can meet index completely to be wanted It asks.
(3) 80mm steel plates it is conditioned processing and Simulated post-weld heat treatment after -20 DEG C of low-temperature impacts absorb energy be respectively 148J and 116J or so (index request ballistic work >=40J), can not only meet the requirement of index, and with larger remaining Amount.
Specific implementation mode
Specific implementation mode provided by the invention is described in detail below.
A kind of high tough steels for pressure vessel use of nuclear power station, the steel chemical composition mass percent are as follows：C：0.10%~ 0.19%, Si：0.20%~0.45%, Mn：0.40%~1.30%, P≤0.010%, S≤0.003%, Cr：0.35%~ 0.65%, Ni：0.30%~0.60%, Mo：0.35%~0.50%, V≤0.04%, B≤0.005%, Ti≤0.010%, Remaining content is Fe and inevitable impurity, unit：Wt%.
It is as follows using mentioned component design reason：
(1)C：It is main intensified element in steel, the intensity and quenching degree of steel can be effectively improved, but also reduces simultaneously Plasticity, toughness and the weldability of steel, the relatively low intensity that can lead to steel plate of C content is insufficient, and C content is excessively high, and brittle transition temperature is bright Aobvious to increase, weld seam fire check sensibility also greatly improves, and welding performance is poor, in the premise for ensureing intensity and toughness needed for steel plate Under, it is 0.10~0.19% the present invention claims C content.
(2)Si：It is one of intensified element in steel, deoxidation and solution strengthening can be played the role of, element silicon diffusion is slow, Silicate inclusion object is also easy to produce in steel, so Si contents are not easy excessively high, practical control is 0.20-0.45%.
(3)Mn：It is main alloying element in steel, the quenching degree and intensity of steel can be improved by solution strengthening, simultaneously Also it can improve toughness, but Mn too high levels, detrimental effect can be generated to toughness, therefore the present invention claims Mn contents controls in steel to exist 0.40~1.30%.
(4)P、S：It is the harmful element in steel, the impact flexibility of steel can be reduced, easily aggravation is centrally formed segregation and loose etc. Defect, while radiation embrittlement can be caused, therefore it is required that the lower P, S content the better, but consider that production cost, the present invention design P Content is that≤0.010%, S contents are≤0.002%.
(5)Cr：Solution strengthening can be generated in steel, increase resistance to corrosion.Coordinate manganese element, Mn-Cr can be formed It is alloy system, improves the overall performance of steel plate and uniform and stable property.But the excessively high brittle transition temperature that can increase steel of chromium.Therefore It is 0.35~0.65% the present invention claims Cr contents control in steel.
(6)Ni：The quenching degree of steel can be improved and improve the low-temperature flexibility of steel, and weldability can be improved, the present invention It is required that the control of Ni contents is 0.30~0.60% in steel.
(7)Mo：The quenching degree and heat resistance that steel can mainly be improved, prevent steel belt roof bolt brittleness, can in quenched and tempered steel Steel belt roof bolt stability is improved, to more effectively reduce residual stress, raising plasticity, therefore the present invention by the Weight control of Mo 0.35~0.50%.
(8)V：The intensity and yield tensile ratio of steel are mainly improved in quenched and tempered steel, crystal grain thinning improves the effect of obdurability, But vanadium has stronger affinity with carbon and oxygen, and quenching degree can be influenced in the presence of with carbide form, therefore the model of V is added in steel Enclose is 0~0.04%.
(9)B：The quenching degree that steel can be properly increased in steel, to save other more expensive metals, therefore the range control of B System ranging from 0~0.005%.
(10)Ti：Plasticity and toughness can be improved in ordinary low-alloy steel, since carbon fixation nitrogen and sulphur form carbonization Titanium improves the intensity of steel, therefore the scope control of Ti is 0~0.010%.
For a kind of manufacturing method of the high tough steels for pressure vessel use of nuclear power station, including：
(1) smelting process：It is produced using converter smelting, external refining, vacuum processing and continuous casting process；Molten steel is in temperature Degree carries out vacuum outgas when reaching 1550 DEG C -1570 DEG C；
(2) rolling mill practice：1200 DEG C -1250 DEG C of billet heating temperature, total deformation >=67%, average pass deformation >= 15%；Start rolling temperature：1150 DEG C -1200 DEG C, finishing temperature：≥1000℃；
(3) heat treatment process：Steel plate carries out stacking slow cooling after rolling, and modifier treatment is carried out to steel plate after slow cooling；
Quenching treatment：890 DEG C~920 DEG C, soaking time 2-3min/mm reaches the complete austenitizing temperature of steel plate, fills Code insurance temperature, after coming out of the stove immediately water cooling until steel billet temperature is to 100 DEG C or less；
Temper：630 DEG C~660 DEG C, soaking time 4-6min/mm is fully kept the temperature in the temperature range, is ensured in steel Carbide Precipitation, and form high tempering Soxhlet body tissue.
(4) Simulated post-weld heat treatment technique：600~610 DEG C of temperature, soaking time 15-17h, 400 DEG C or more heating and cooling speed Rate≤55 DEG C/h.
【Specific embodiment】
Each embodiment chemical composition is as shown in table 1.
1 each embodiment steel smelting chemical composition (%) of table
Embodiment C Si Mn P S Cr Ni Mo V B Ti
1 0.10 0.32 0.40 0.005 0.0015 0.35 0.32 0.50 0.012 0.001 0.007
2 0.13 0.40 1.15 0.008 0.0010 0.45 0.58 0.39 0.020 0.003 0.006
3 0.15 0.45 0.75 0.007 0.0017 0.58 0.47 0.37 0.017 0.004 0.005
4 0.16 0.20 1.05 0.006 0.0013 0.51 0.39 0.42 0.021 0.002 0.008
5 0.19 0.29 1.30 0.008 0.0009 0.65 0.60 0.35 0.018 0.003 0.009
The production method of the present embodiment, molten steel pass through converter smelting, LF+VD external refinings, vacuum processing and cast, rolling Finished steel plate specification is 30mm~100mm, and Simulated post-weld heat treatment technique is 605 DEG C of temperature, soaking time 16h, 400 DEG C or more Temperature rate≤55 DEG C/h.Rolling and heat treatment process, mechanical property result are as shown in table 2 and table 3.
Table 2 rolls and heat treatment process
3 mechanical property of steel plate result of table
From table 3 it can be seen that 30~100mm specification steel plates pass through modifier treatment and Simulated post-weld heat treatment, properties Index fully meets requirement, and steel plate has good comprehensive mechanical property.
Above example is being implemented down based on the technical solution of the present invention, gives detailed embodiment and tool The operating process of body, but protection scope of the present invention is not limited to the above embodiments.Method therefor is such as without spy in above-described embodiment It is conventional method not mentionlet alone bright.

Claims (2)

1. a kind of high tough steels for pressure vessel use of nuclear power station, which is characterized in that the steel chemical composition mass percent is as follows：C： 0.10%~0.19%, Si：0.20%~0.45%, Mn：0.40%~1.30%, P≤0.010%, S≤0.003%, Cr： 0.35%~0.65%, Ni：0.30%~0.60%, Mo：0.35%~0.50%, V≤0.04%, B≤0.005%, Ti≤ 0.010%, remaining content is Fe and inevitable impurity, unit：Wt%.
2. for a kind of manufacturing method of the high tough steels for pressure vessel use of nuclear power station described in claim 1, which is characterized in that packet It includes：
(1) smelting process：It is produced using converter smelting, external refining, vacuum processing and continuous casting process；Molten steel is reached in temperature To carrying out vacuum outgas at 1550-1570 DEG C；
(2) rolling mill practice：1200 DEG C -1250 DEG C of billet heating temperature, total deformation >=67%, average pass deformation >= 15%；Start rolling temperature：1150 DEG C -1200 DEG C, finishing temperature：≥1000℃；
(3) heat treatment process：Steel plate carries out stacking slow cooling after rolling, and modifier treatment is carried out to steel plate after slow cooling；
Quenching treatment：890 DEG C~920 DEG C, soaking time 2-3min/mm reaches the complete austenitizing temperature of steel plate, fully protects Temperature, after coming out of the stove immediately water cooling until steel billet temperature is to 100 DEG C or less；
Temper：630 DEG C~660 DEG C, soaking time 4-6min/mm is fully kept the temperature in the temperature range, ensures to be carbonized in steel Object is precipitated, and forms high tempering Soxhlet body tissue.
CN201810896988.2A 2018-08-08 2018-08-08 A kind of high tough steels for pressure vessel use of nuclear power station and its manufacturing method Pending CN108677095A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113930683A (en) * 2021-10-13 2022-01-14 鞍钢股份有限公司 Steel for high-temperature-resistant pressure vessel of nuclear power station and manufacturing method thereof
CN116219279A (en) * 2022-12-23 2023-06-06 鞍钢股份有限公司 High-strength high-toughness steel for nuclear reactor containment vessel and manufacturing method thereof

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CN103361567A (en) * 2012-03-30 2013-10-23 鞍钢股份有限公司 Steel used for voltage stabilizer of pressurized water reactor power station and manufacture method of steel

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CN103361567A (en) * 2012-03-30 2013-10-23 鞍钢股份有限公司 Steel used for voltage stabilizer of pressurized water reactor power station and manufacture method of steel

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113930683A (en) * 2021-10-13 2022-01-14 鞍钢股份有限公司 Steel for high-temperature-resistant pressure vessel of nuclear power station and manufacturing method thereof
CN116219279A (en) * 2022-12-23 2023-06-06 鞍钢股份有限公司 High-strength high-toughness steel for nuclear reactor containment vessel and manufacturing method thereof
CN116219279B (en) * 2022-12-23 2024-04-16 鞍钢股份有限公司 High-strength high-toughness steel for nuclear reactor containment vessel and manufacturing method thereof

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Application publication date: 20181019