CN108004476B - Super-thick steel plate for pressurized water reactor nuclear power station structural module and manufacturing method thereof - Google Patents

Super-thick steel plate for pressurized water reactor nuclear power station structural module and manufacturing method thereof Download PDF

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CN108004476B
CN108004476B CN201610961039.9A CN201610961039A CN108004476B CN 108004476 B CN108004476 B CN 108004476B CN 201610961039 A CN201610961039 A CN 201610961039A CN 108004476 B CN108004476 B CN 108004476B
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steel plate
steel
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welding
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CN108004476A (en
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孙殿东
李德刚
王永才
胡海洋
颜秉宇
王长顺
李文斌
王勇
王爽
李黎明
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Angang Steel Co Ltd
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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
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16Controlling or regulating processes or operations
    • B22D11/18Controlling or regulating processes or operations for pouring
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10Handling in a vacuum
    • 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
    • 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
    • C22C38/06Ferrous 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 provides an ultra-thick steel plate for a pressurized water reactor nuclear power station structural module and a manufacturing method thereof, wherein the steel plate comprises the following components in percentage by weight: 0.16-0.25% of C; 0.22-0.42% Si; 1.10-1.60% Mn; p is less than or equal to 0.010 percent; s is less than or equal to 0.005 percent; 0.10-0.30% Cr; 0.60-0.80% Mo; 0.020-0.045% of Al; 0.30-0.50 of Ni, and the balance of Fe and inevitable impurities. The method comprises the steps of ladle smelting, continuous casting, vacuum composite welding, slab heating, rolling, straightening, stacking, slow cooling, heat treatment, ultrasonic detection, trimming, inspection and warehousing; the product produced by the process has good comprehensive mechanical property, and the Z-direction reduction of area at the 1/2 part and the 1/4 part of the thickness of the steel plate reaches more than 65 percent.

Description

Super-thick steel plate for pressurized water reactor nuclear power station structural module and manufacturing method thereof
Technical Field
the invention belongs to the field of metal materials, and particularly relates to an ultra-thick steel plate for a pressurized water reactor nuclear power station structural module and a manufacturing method thereof.
Background
In order to guarantee the steady development of national economy, China is exploring a large-scale nuclear power construction plan, and the passive pressurized water reactor nuclear power station AP1000 is taken as a typical third-generation nuclear power station and is a main reactor type for the construction of nuclear power units in China in future. Although the modular construction of the nuclear power station is reflected in the previous domestic nuclear power construction, the AP1000 nuclear power station maximizes the scale and the number of modules, and realizes the leap from the 'modules' to the 'modular' quality.
Just because the AP1000 third generation advanced pressurized water reactor nuclear power unit adopts large-scale modular design and construction technology, the construction quality of the nuclear power station can be ensured, and meanwhile, the construction period is greatly shortened. Each AP1000 nuclear power unit requires 178 modules, wherein 108 structural modules and 70 mechanical modules. Building so many structural and mechanical modules requires a significant amount of ferrous material. Because the safety requirement on the AP1000 nuclear power unit is higher, and the installed capacity of the nuclear power unit is gradually increased, the higher requirement on the steel for the AP1000 nuclear power unit module is also provided: firstly, the thickness specification is expanded from the maximum thickness of 80mm to 152mm, and the maximum single weight can reach 39 tons; secondly, higher requirements are put forward on the internal quality of the steel plate, and ultrasonic flaw detection is added; thirdly, the Z-direction performance requirements of the head and the tail of the steel plate are increased, and the steel plate has higher performance uniformity.
The high-toughness steel plate for the nuclear power unit structural module, which is produced at present, mostly has the thickness of below 160mm, and the single weight of the steel plate is relatively small, 0.08-0.22 percent of chemical components of the high-toughness steel plate disclosed in the disclosure of high-toughness steel plate for the nuclear power unit mechanical module supporting piece and a manufacturing method thereof (publication number is CN 103114254A), 0.15-0.45 percent of silicon, 0.60-1.10 percent of manganese, less than or equal to 0.020 percent of phosphorus, less than or equal to 0.015 percent of sulfur, 0.60-1.00 percent of nickel, 0.40-0.70 percent of chromium, 0.40-0.60 percent of molybdenum, 0.15-0.55 percent of copper, 0.020-0.080 percent of vanadium, 0.008-0.030 percent of titanium, 0.0005-0.005 percent of boron, 0.020-0.050 percent of aluminum. According to the scheme, alloy elements are properly added on the basis of low-carbon content design, impurity elements such as phosphorus, sulfur, nitrogen, arsenic and the like and residual elements in the steel are strictly controlled, and the tensile strength of the steel is up to over 800 MPa. However, the maximum thickness producible in the claims of this reference is 65mm without specifying the properties in the thickness direction of the steel sheet.
The invention discloses an ultra-large thickness steel plate for nuclear power engineering equipment and a production method (with the publication number being CN 102851578A), and provides the ultra-large thickness steel plate for the nuclear power engineering equipment and the production method, wherein the ultra-large thickness steel plate comprises the following components in percentage by weight: c is less than or equal to 0.20 percent, Si: 0.10-0.30%, Mn: 1.15-1.60%, P is less than or equal to 0.012%, S is less than or equal to 0.010%, Mo: 0.45-0.55%, Ni: 0.50-0.80%, Cr is less than or equal to 0.20%, V is less than or equal to 0.01%, Cu is less than or equal to 0.18%, Nb is less than or equal to 0.02%, Ti is less than or equal to 0.03%, AlGeneral assemblyNot less than 0.020% and not more than 0.33% of Cu +6 Sn. The residual amount is Fe and inevitable impurities, and comprises the working procedures of smelting, casting, heating, rolling, cooling and tempering. According to the steel plate with the ultra-large thickness and the production method, the thickness of the steel plate is 155mm, the production method is novel and unique, the steel plate is moderate in strength, good in low-temperature impact toughness and high-temperature tensile property, good in lamellar tearing resistance, cold machining performance and welding performance, capable of meeting the requirements of nuclear power key equipment, and capable of being applied to manufacturing of nuclear power station evaporators, high-pressure seal heads, pressure vessels and other key equipment. However, the maximum thickness which can be produced in the claims of the comparison document is 155mm, the performance of the steel plate in the thickness direction is not clear, and a die casting production mode with higher manufacturing cost is adopted.
The invention relates to a method for producing an extra-thick steel plate (publication number is CN 101348879A), which mainly comprises the steps of molten iron pretreatment, converter smelting, external refining, slab casting, rolling and cooling, and is characterized in that LF refining treatment and VD degassing are adopted; adding ferrovanadium before tapping, wherein the addition amount of ferrovanadium is 1-1.5 kg/ton of steel, putting into an electromagnetic stirring technology in the continuous casting process, controlling the heating temperature of a plate blank before rolling to 1150-1220 ℃ to ensure fine austenite grains, fully descaling by using high-pressure water before rolling and in the rolling process, controlling the rolling temperature of a steel billet to 1100 +/-50 ℃, and controlling the thickness of an intermediate billet to be 1.2-1.49 times of the thickness of a finished product; the finishing temperature of the finished product with the thickness of 71-100mm is 830 +/-20 ℃, and then the finished product is air-cooled to room temperature; the final rolling temperature of 101-150 mm is 860 +/-20 ℃, and the steel plate enters laminar cooling and is cooledThe temperature of the red-back is 720 +/-20 ℃. The invention has the advantages of high production efficiency, favorable mass production, favorable mechanical property and the like, and the yield strength ReLThe impact energy AKv is more than or equal to 330MPa and more than or equal to 150J at the temperature of minus 20 ℃, and the method is suitable for most mechanical components and the use temperature. However, the maximum thickness that can be produced in the claims of this reference is 150mm, the properties in the thickness direction of the steel sheet are not specified, and the steel sheet compression ratio of 100mm or more is less than 3.
as can be seen from the above reference documents, the production of the super-thick steel plate which can be used for nuclear power, engineering machinery and other members at present has the following defects:
1. The product has small thickness specification, small single weight and narrow application range;
2. the performance of the steel plate in the thickness direction is not clear, and the requirement of ultrasonic detection is less clear;
3. The production process is complex, the production efficiency is low, the cost is high, and the defects of core segregation, looseness and the like are easily generated.
disclosure of Invention
The invention aims to overcome the problems and the defects and provides an ultra-thick steel plate for a structural module of a pressurized water reactor nuclear power station and a manufacturing method thereof, the ultra-thick steel plate has good comprehensive mechanical property through chemical composition optimization and production process parameter design, and the Z-direction section shrinkage rate of the steel plate at the 1/2 part and the 1/4 part of the thickness of the steel plate reaches more than 65 percent.
The purpose of the invention is realized as follows:
the super-thick steel plate for the structural module of the pressurized water reactor nuclear power station comprises the following components in percentage by weight: 0.16-0.25% of C; 0.22-0.42% Si; 1.10-1.60% Mn; p is less than or equal to 0.010 percent; s is less than or equal to 0.005 percent; 0.10-0.30% Cr; 0.60-0.80% Mo; 0.020-0.045% of Al; 0.30-0.50 of Ni, and the balance of Fe and inevitable impurities.
The invention has the following design reasons:
(1) c: c is an important element in the super-thick steel plate, and the strength and hardness of the steel increase with the increase of the carbon content without changing the structure of the steel, but the carbon content is too high, which is not favorable for the control of the second phase such as welding and cementite, and also significantly deteriorates the toughness, plasticity and steel plate welding performance. In order to ensure that the super-thick steel plate has good comprehensive mechanical property and welding property matching, the content of C in the steel is required to be controlled within the range of 0.16-0.25%.
(2) si: si has a strong solid solution strengthening effect, can obviously improve the strength and the hardness of steel, and simultaneously plays a role of a deoxidizer, but the aging sensitivity and the ductile-brittle transition temperature of the steel are increased due to the excessively high Si, inclusions are easy to appear, the steel is easy to rust, and the rust is easy to be rolled into the surface layer of a steel plate in the hot rolling production, and the Si content in the steel is required to be controlled to be 0.22-0.42%.
(3) mn: mn in steel plays a role in deoxidation and elimination of the influence of sulfur in smelting, ferrite can be strengthened in a solid solution strengthening mode, the hardenability of the steel can be improved, and Mn in non-quenched and tempered steel reduces the austenite transformation temperature, refines ferrite grains and improves the impact energy of the steel, but when the Mn content is too high, the steel is hardened and the ductility is deteriorated, thereby seriously influencing the Z-directional performance of the steel, so that the Mn content in the steel is required to be controlled within the range of 1.10-1.60%.
(4) Cr: cr can refine and equally divide the structure, and can improve the strength, hardness and wear resistance of steel, but the too high Cr content can reduce the plasticity and toughness of the steel and influence the Z-direction performance of the steel, so the Cr content in the steel is required to be controlled to be 0.10-0.30%.
(5) Mo: mo can refine the crystal grains of the steel, improve the hardenability and the heat strength without reducing the plasticity and the toughness, so the Z-direction performance of the steel can be improved, and the Mo content in the steel is required to be controlled to be 0.60-0.80%.
(6) Al: al can be used as an aluminum nitride forming element to effectively refine austenite grains, so that ferrite grains and tissues are refined, the impact toughness of the steel is improved, and when the Al exceeds 0.07%, the deoxidation effect is saturated; and higher, it is detrimental to the toughness of the base metal and the weld heat affected zone. Therefore, the present invention requires that the Al content in the steel be 0.025-0.045%.
(7) Ni: the nickel relaxes the stress by reducing the dislocation motion resistance of the steel grade, and further changes the substructure of a matrix structure, so that the toughness of the steel is improved, and therefore the range of adding Ni into the steel is 0.30-0.50%.
(8) P: phosphorus is a harmful element in steel, segregates grain boundaries, deteriorates toughness, increases cold brittleness of steel, deteriorates welding performance, reduces plasticity, and deteriorates cold bending performance. Therefore, the lower the P content in the steel, the better, the lower the invention is required to be less than 0.010%.
(9) S: sulfur is a harmful element in general. The manganese sulfide has certain plasticity and is elongated and extended along the rolling direction, so that the anisotropy of the steel is increased, and the transverse performance of the steel is very unfavorable. The iron sulfide formed by sulfur can cause hot brittle cracks in the steel during hot rolling and welding, and the content of the iron sulfide is controlled to be the minimum, so that the S content in the steel is required to be limited to be below 0.005 percent.
a manufacturing method of an ultra-thick steel plate for a pressurized water reactor nuclear power station structural module comprises the steps of ladle smelting, continuous casting, vacuum composite welding, plate blank heating, rolling, straightening, stacking, slow cooling, heat treatment, ultrasonic detection, trimming, inspection and warehousing;
(1) Smelting: performing vacuum treatment by adopting RH, wherein the RH/VD cycle time is more than or equal to 10min, the [ H ] in steel is controlled to be less than 2ppm, the [ O ] is controlled to be less than 25ppm, and the [ N ] is controlled to be less than 35 ppm; the target superheat degree of the tundish is less than 20 ℃; the whole process is protected and poured, and before the machine is operated, the static argon blowing time of the steel ladle is ensured to be more than or equal to 3 min; stacking and slowly cooling the casting blank and the hot blank after the casting blank is off the line, wherein the slow cooling time is more than or equal to 24 hours, and providing a high-quality continuous casting blank for vacuum hybrid welding;
(2) Vacuum hybrid welding: before vacuum compounding of a mother blank, the surface and the side edges are treated by a milling machine, the roughness of a welding surface is not more than 12um, the vacuum degree of a vacuum chamber is higher than 0.03Pa during welding, the welding voltage is controlled to be 80KV-100KV, the welding current is controlled to be 60mA-180mA, the welding speed is controlled to be 150mm/min-280mm/min, a welding seam is full, a pit does not appear at a flowing position of welding liquid, an arc striking area and an arc closing area of the welding seam are consistent continuous welding seams, and a discontinuous area of the welding seam does not exist;
(3) Heating the plate blank: before charging the composite blank into a furnace, spraying high-temperature-resistant anti-oxidation paint on the surface to prevent excessive oxidation during heating; the temperature of the furnace is required to be controlled between 500 ℃ and 700 ℃ during charging, and the heating temperature is controlled between 1150 ℃ and 1250 ℃;
(4) Rolling, straightening, stacking and slow cooling: descaling the upper surface and the lower surface of the billet before rolling to ensure that foreign matters on the upper surface of the billet are removed completely; the longitudinal rolling adopts slow large reduction, the pass reduction rate is more than or equal to 15 percent, and the rolling speed is controlled to be 0.8-1.5 m/s; the steel plate is off-line as soon as possible after being rolled and is slowly cooled with the hot steel plate stack, and the slow cooling time is not less than 36 hours;
(5) And (3) heat treatment: normalizing temperature: 900 +/-10 ℃, heat preservation time: 2-3min/mm, and through normalizing the steel plate, eliminating large or netted ferrite or banded structure in the steel to refine grains and further optimize and homogenize the performance and structure of the steel plate.
The invention provides an ultra-thick steel plate for a pressurized water reactor nuclear power station structural module and a manufacturing method thereof, the thickness of the produced steel plate is 130-280mm, and the steel plate has the beneficial effects that:
(1) The product produced by the process has good comprehensive mechanical property through chemical component optimization and production process parameter design, and the Z-direction reduction of area at the 1/2 part and the 1/4 part of the thickness of the steel plate reaches more than 65 percent.
(2) The production process adopted by the invention can improve the internal quality of the steel plate while ensuring the comprehensive performance requirement of the product, can meet the I-grade requirement of the GB/T2970 standard, and can obviously reduce the production cost mainly by improving the yield compared with the product produced by die casting.
Detailed Description
The present invention is further illustrated by the following examples.
According to the embodiment of the invention, according to the component proportion of the technical scheme, smelting, continuous casting, vacuum composite welding, slab heating, rolling, straightening, stacking and slow cooling, heat treatment, ultrasonic detection, trimming, inspection and warehousing are carried out. The compositions of the steels of the examples of the invention are shown in table 1. The vacuum hybrid welding process parameters of the steel of the embodiment of the invention are shown in Table 2. The main rolling and heat treatment process parameters of the steels of the examples of the invention are shown in Table 3.
TABLE 1 composition (wt%) of steels of examples of the present invention
TABLE 2 vacuum hybrid welding Process parameters for steels of examples of the invention
Examples Degree of vacuum Pa Welding voltage KV Welding current mA Welding speed mm/min
1 0.008 85 180 200
2 0.006 90 150 230
3 0.002 100 90 260
TABLE 3 Main Rolling and Heat treatment Process parameters of steels according to examples of the invention
Example one
In the production method of the embodiment, molten steel is smelted in a converter, refined outside the converter and treated in vacuum to be cast into continuous casting billets (the section is 250mm), the two continuous casting billets are subjected to vacuum composite welding to form composite billets with the section of 500mm, and the specification of rolled finished steel plates is 130 mm. The components of the steel of the embodiment 1 of the invention are shown in Table 1, the vacuum composite welding process parameters of the steel 1 of the embodiment of the invention are shown in Table 2, the rolling and heat treatment process parameters of the steel 1 of the embodiment of the invention are shown in Table 3, and the mechanical properties of the steel 1 of the embodiment of the invention are shown in Table 4.
TABLE 4 mechanical Properties of inventive example Steel 1
The 130mm steel plate is normalized, all performance indexes completely meet the requirements, and meanwhile, the steel plate has good comprehensive mechanical properties and welding performance and completely meets the requirements of GB/T2970 standard I-level ultrasonic flaw detection.
example two
In the production method of the embodiment, molten steel is smelted by a converter, refined outside the converter and treated in vacuum to be cast into continuous casting billets (with the cross section of 300mm), the two continuous casting billets are subjected to vacuum composite welding to form composite billets with the cross section of 600mm, and the specification of rolled finished steel plates is 200 mm. The components of the steel of the embodiment 2 of the invention are shown in table 1, the vacuum composite welding process parameters of the steel 2 of the embodiment of the invention are shown in table 2, the rolling and heat treatment process parameters of the steel 2 of the embodiment of the invention are shown in table 3, and the mechanical properties of the steel 2 of the embodiment of the invention are shown in table 5.
TABLE 5 mechanical Properties of inventive example Steel 2
The 200mm steel plate is normalized, all performance indexes completely meet the requirements, and meanwhile, the steel plate has good comprehensive mechanical properties and welding performance and completely meets the I-level ultrasonic flaw detection requirements of the GB/T2970 standard.
EXAMPLE III
in the production method of the embodiment, molten steel is smelted in a converter, refined outside the converter and treated in vacuum, a continuous casting billet (with the section of 300mm) is cast, three continuous casting billets are subjected to vacuum composite welding to form a composite billet with the section of 900mm, and the specification of a rolled finished steel plate is 280 mm. The components of the steel of the embodiment 3 of the invention are shown in table 1, the vacuum composite welding process parameters of the steel 3 of the embodiment of the invention are shown in table 2, the rolling and heat treatment process parameters of the steel 3 of the embodiment of the invention are shown in table 3, 1.01 asynchronous rolling is adopted for preventing the warping of the steel plate after the steel plate is rolled to 450mm, and the mechanical properties of the steel 3 of the embodiment of the invention are shown in table 6.
TABLE 6 mechanical Properties of inventive example Steel 3
The 280mm steel plate is normalized, all performance indexes completely meet the requirements, and meanwhile, the steel plate has good comprehensive mechanical properties and welding performance and completely meets the requirements of GB/T2970 standard I-level ultrasonic flaw detection.

Claims (1)

1. The super-thick steel plate for the structural module of the pressurized water reactor nuclear power station is characterized by comprising the following components in percentage by weight: 0.19% -0.25% of C; 0.22-0.42% Si; 1.10-1.41% Mn; p is less than or equal to 0.010 percent; s is less than or equal to 0.005 percent; 0.10-0.30% Cr; 0.65-0.80% of Mo; 0.020-0.045% of Al; 0.30 to 0.35 percent of Ni, and the balance of Fe and inevitable impurities; the manufacturing method of the super-thick steel plate for the pressurized water reactor nuclear power station structural module comprises the steps of ladle smelting, continuous casting, vacuum composite welding, plate blank heating, rolling, straightening, stacking, slow cooling, heat treatment, ultrasonic detection, trimming, inspection and warehousing;
(1) Smelting: performing vacuum treatment by adopting RH, wherein the RH/VD cycle time is more than or equal to 10min, the [ H ] in steel is controlled to be less than 2ppm, the [ O ] is controlled to be less than 25ppm, and the [ N ] is controlled to be less than 35 ppm; the target superheat degree of the tundish is less than 20 ℃; the whole process is protected and poured, and before the machine is operated, the static argon blowing time of the steel ladle is ensured to be more than or equal to 3 min; stacking and slowly cooling the casting blank and the hot blank after the casting blank is off the line, wherein the slow cooling time is more than or equal to 24 hours;
(2) vacuum hybrid welding: before the vacuum compounding of the mother blank, the surface and the side edges are treated by a milling machine, the roughness of a welding surface is not more than 12um, the vacuum degree of a vacuum chamber during welding is higher than 0.03Pa, the welding voltage is controlled to be 80KV-100KV, the welding current is controlled to be 60mA-180mA, and the welding speed is controlled to be 150mm/min-280 mm/min;
(3) heating the plate blank: the temperature of the furnace is required to be controlled between 500 ℃ and 700 ℃ during charging, and the heating temperature is controlled between 1150 ℃ and 1250 ℃;
(4) Rolling, straightening, stacking and slow cooling: descaling the upper and lower surfaces of the blank before rolling; the longitudinal rolling adopts slow large reduction, the pass reduction rate is more than or equal to 15 percent, and the rolling speed is controlled to be 0.8-1.5 m/s; the steel plate is off-line as soon as possible after being rolled and is slowly cooled with the hot steel plate stack, and the slow cooling time is not less than 36 hours;
(5) And (3) heat treatment: normalizing temperature: 900 +/-10 ℃, and the heat preservation time: 2-3 min/mm.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5210817A (en) * 1975-07-10 1977-01-27 Nippon Steel Corp Steel sheet having excellent toughness for pressure vessel of atomic f urnace
CN105274433A (en) * 2014-07-16 2016-01-27 鞍钢股份有限公司 Super-thick steel plate and composite production method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5210817A (en) * 1975-07-10 1977-01-27 Nippon Steel Corp Steel sheet having excellent toughness for pressure vessel of atomic f urnace
CN105274433A (en) * 2014-07-16 2016-01-27 鞍钢股份有限公司 Super-thick steel plate and composite production method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
复合坯生低合金特厚钢板初探;刘海宽等;《宽厚板》;20131231;第19卷(第6期);第20-22页 *

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