CN108950387B - steel with excellent high-temperature performance and thick specification for nuclear power safety injection box and manufacturing method thereof - Google Patents
steel with excellent high-temperature performance and thick specification for nuclear power safety injection box and manufacturing method thereof Download PDFInfo
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- 239000010959 steel Substances 0.000 title claims abstract description 115
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 114
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000002347 injection Methods 0.000 title claims abstract description 17
- 239000007924 injection Substances 0.000 title claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 30
- 238000005096 rolling process Methods 0.000 claims abstract description 19
- 238000005496 tempering Methods 0.000 claims abstract description 16
- 238000010791 quenching Methods 0.000 claims abstract description 14
- 230000000171 quenching effect Effects 0.000 claims abstract description 14
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 8
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 8
- 238000004321 preservation Methods 0.000 claims abstract description 8
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 7
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 7
- 229910052802 copper Inorganic materials 0.000 claims abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 5
- 230000006835 compression Effects 0.000 claims abstract description 4
- 238000007906 compression Methods 0.000 claims abstract description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 11
- 238000003723 Smelting Methods 0.000 claims description 8
- 238000006477 desulfuration reaction Methods 0.000 claims description 4
- 230000023556 desulfurization Effects 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- 238000007670 refining Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims 2
- 238000000034 method Methods 0.000 description 9
- 229910052799 carbon Inorganic materials 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 229910052720 vanadium Inorganic materials 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 229910000746 Structural steel Inorganic materials 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004886 process control Methods 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910001563 bainite Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000009489 vacuum treatment Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000005355 lead glass Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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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
- 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
-
- 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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses steel with excellent high-temperature performance for a thick nuclear power safety injection box and a manufacturing method thereof. The steel contains C: 0.14% -0.20%, Si: 0.10-0.60%, Mn: 0.30-0.40%, P is less than or equal to 0.008%, S is less than or equal to 0.002%, Mo: 0.30% -0.60%, Ni: 0.45-0.90%, Cr: 0.50-0.80 percent of Cu, less than or equal to 0.05 percent of AltLess than or equal to 0.04 percent, less than or equal to 0.00015 percent of H, less than or equal to 0.0020 percent of O, and the balance of Fe and inevitable impurities. Heating a steel ingot to 1150-1350 ℃, preserving heat for more than 2 hours, wherein the compression ratio of a steel plate is more than 3:1, the initial rolling temperature is more than or equal to 1100 ℃, the final rolling temperature is more than or equal to 920 ℃, and the rolling speed is 1.0-1.5 m/s; quenching temperature is 850-925 ℃, and heat preservation time is 1-4 min/mm; the tempering temperature is 630-670 ℃, and the heat preservation time is 3-7 min/mm. After the steel plate with the thickness of 80-150 mm is subjected to quenching and tempering heat treatment and simulated postweld heat treatment for 16 hours, the comprehensive mechanical property is good.
Description
Technical Field
The invention belongs to a ferrous metal material, and particularly relates to steel with excellent high-temperature tensile property for a nuclear power safety injection box and a manufacturing method thereof.
Background
The nuclear power safety injection box is advanced equipment for injecting cooling water to accident equipment when an accident occurs to a nuclear power station, boron-containing water is stored in the safety injection box, a cavity at the upper part is filled with nitrogen, and when the pressure of a reactor coolant system is reduced to be lower than the pressure of the safety injection box, the boron-containing water is injected into a cold section of the reactor coolant system by the pressure of the nitrogen, so that a reactor core can be submerged in a short time, a fuel rod is prevented from being melted, and the safety and the integrity of the reactor system are ensured. The manufacturing requirements are very strict, the process control is extremely strict, and the acceptance check procedure is very strict. At present, the seal heads and the steel plates for the cylinder of the safety injection box almost all depend on import, the price is high, and the delivery period is long. There are two main problems: firstly, according to the design requirements of the plates, the end socket and the barrel plate belong to ultra-wide plates (the plate width is 4.5m), so that strict requirements are imposed on equipment and capacity of a production factory; and secondly, after the steel plate is subjected to simulated postweld heat treatment for more than 16 hours, the strength of the steel plate is obviously reduced, particularly the tensile strength of the high-temperature stretching at 150 ℃ is lower than the index requirement, but the steel plate is limited by imported steel plates, and the index has to be reduced.
CN201410098857.1 entitled "Steel plate for pressure vessel of nuclear Power station and manufacturing method thereof", mainly discloses steel for pressure vessel of nuclear Power station and manufacturing method thereof, the steel plate comprises: 0.10 to 0.20 percent of C, 0.15 to 0.40 percent of Si, 0.60 to 1.40 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.30 percent of Ni, less than or equal to 0.18 percent of Cu, less than or equal to 0.30 percent of Cr, less than or equal to 0.08 percent of Mo, less than or equal to 0.020 percent of V, less than or equal to 0.020 percent of Nb, 0.008 to 0.030 percent of Ti, 0.020 to 0.050 percent of Alt, less than or equal to 0.012 percent of N, less than or equal to 0.70 percent of Ni + Cu + Cr + Mo. The steel plate has good low-temperature toughness and high-temperature resistance, excellent and stable welding performance and cold and hot processing performance, good radiation embrittlement resistance and low cost. However, in the component design of the invention, the contents of elements such as C, Ni and Mo are low, and the steel plate is produced by adopting a normalizing heat treatment or controlled rolling mode, so that the strength of the designed steel plate is low, and the performance of the steel plate after long-time simulated postweld heat treatment is not concerned.
CN201210387824.X entitled "18 MND5 Nuclear Power Low alloy structural steel and process control method", discloses 18MND5 Nuclear Power Low alloy structural steel and process control method. Comprises the following chemical components in percentage by weight: less than or equal to 0.22 percent of C, 0.10 to 0.30 percent of Si, 1.15 to 1.60 percent of Mn, less than or equal to 0.012 percent of S, less than or equal to 0.012 percent of P, less than or equal to 0.04 percent of Al, 0.43 to 0.57 percent of Mo, less than or equal to 0.08 percent of Cu, 0.50 to 0.80 percent of Ni, less than or equal to 0.01 percent of V, less than or equal to 0.008 percent of N, less than or equal to 1.5ppm of H, less than or equal to 30ppm of O, less than or equal to 0.013 percent of N, less than or equal to 0.25 percent of Cr, less than or equal to 0.08 percent of Co, less than or equal to 0.0018 percent of B, less. The mechanical property of the 18MND5 material produced by the method is obviously superior to that of other steel grades, and the 18MND5 high-strength low-alloy structural steel can be used for nuclear power pressure bearing. The above patent adopts an electric furnace smelting-forging-heat treatment process, has low production rhythm and long production period, is not suitable for continuous mass production, and is not clearly applicable to the thickness range of steel plates in the embodiment.
CN201010276502.9 entitled "Steel for Nuclear reactor Containment vessel head and barrel", discloses a Steel for Nuclear reactor Containment vessel head and barrel, which comprises the following chemical components by weight percent: less than or equal to 0.20 percent of C, 0.15 to 0.55 percent of Si, 0.90 to 1.60 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, less than or equal to 0.60 percent of Ni, less than or equal to 0.30 percent of Cr, less than or equal to 0.30 percent of Mo, less than or equal to 0.04 percent of Nb, less than or equal to 0.07 percent of V, less than or equal to 0.35 percent of Cu, less than or equal to 0.08 percent of V + Nb, the balance of Fe and inevitable impurities, 0.40 to 0.44 percent of carbon equivalent in steel, and the calculation formula of carbon equivalent is that CE is C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15, the non-metal inclusion. The invention effectively ensures that the steel plate has higher strength and uniform and stable toughness, particularly after long-time stress relief treatment, the strength of the steel plate can not be obviously reduced, and the index requirement can still be met. In the embodiment of the invention, the thickness of the steel plate is 42mm, thicker steel plates are not recorded, the simulated postweld heat treatment time is relatively short, and the high-temperature tensile index condition is not mentioned.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides thick-specification steel for a nuclear power safety injection box with excellent high-temperature performance and a manufacturing method thereof, the thickness of a steel plate can reach 80-150 mm, the steel plate can be effectively ensured to have excellent comprehensive mechanical properties by reasonably controlling the content of chemical elements in the steel and reducing the content of gas and non-metallic inclusions in the steel, and particularly after 16h of simulated postweld heat treatment, the 150 ℃ high-temperature tensile and-50 ℃ low-temperature impact indexes of the steel plate can still completely meet the manufacturing requirements of nuclear power safety injection box equipment.
The specific technical scheme is as follows:
The steel with excellent high-temperature performance for the thick nuclear power safety injection box comprises the following components in percentage by mass: c: 0.14% -0.20%, Si: 0.10-0.60%, Mn: 0.30-0.40%, P is less than or equal to 0.008%, S is less than or equal to 0.002%, Mo: 0.30% -0.60%, Ni: 0.45-0.90%, Cr: 0.50-0.80 percent of Cu, less than or equal to 0.05 percent of AltLess than or equal to 0.04 percent, less than or equal to 0.00015 percent of H, less than or equal to 0.0020 percent of O, and the balance of Fe and inevitable impurities.
The design reason of adopting the components is as follows:
C: the steel plate is a main element for ensuring the strength of the steel plate, can effectively improve the strength and the hardenability of the steel, but also reduces the plasticity, the toughness and the weldability of the steel, so the C content is required to be 0.14-0.20 percent.
Si: the Si content is controlled to be a good lower limit, and the Si element is controlled to be 0.10-0.60 percent in the invention.
mn: mn can not only strengthen a matrix in steel, but also effectively improve the hardenability of a steel plate, and has low cost, but the high content of Mn can increase the temper brittleness sensitivity of the steel and lead crystal grains to have a tendency of coarsening, so the Mn content in the steel is required to be controlled to be 0.30-0.40 percent.
P and S: is a harmful element in steel, P aggravates center segregation and center porosity in steel, and sulfide inclusions formed by S are detrimental to impact toughness and weldability of steel, and therefore, it is required that the lower their content is, the better they are. In the invention, the content of P is controlled to be less than or equal to 0.008 percent and the content of S is controlled to be less than or equal to 0.002 percent.
Mo: the hardenability and heat resistance of the steel plate can be improved, and the tempering brittleness can be reduced or inhibited under the combined action of Cr and Mn elements, so that the content of Mo is controlled to be 0.30-0.60 percent.
Ni: the low-temperature toughness of the steel plate can be obviously improved, and the hardenability of the steel plate is improved, but Ni can reduce the A3 line temperature of the steel, so that the irradiation effect is increased, and therefore, the Ni content in the steel is required to be controlled to be 0.45-0.90%.
cr: the oxidation resistance and the corrosion resistance of the steel can be obviously improved, the hardenability of the steel plate can be improved, but the Cr can also obviously improve the brittle transition temperature of the steel and promote the temper brittleness, so the invention requires that the Cr content in the steel is controlled to be 0.50-0.80 percent.
Cu: cu is the element most harmful to radiation embrittlement, degrades the mechanical properties of the steel, and causes oxidation of the metal surface upon heating, affecting the quality of the steel. Therefore, the Cu content in the nuclear power steel is generally required to be not higher than 0.05%.
Alt: al is a commonly used deoxidizer in steel, can refine grains and improve the impact toughness of a steel plate, but the content of inclusions is increased due to the excessively high content of Al, so that the weldability of the steel plate is affected, and therefore, the invention requires Al in steeltThe content is controlled to be less than or equal to 0.04 percent.
H and O: h and O are harmful to the performance of the steel and can increase the irradiation embrittlement effect, so the lower the content of the H and the O, the better, the H is less than or equal to 0.00015 percent and the O is less than or equal to 0.0020 percent in the steel.
The manufacturing method of the steel for the nuclear power safety injection box comprises smelting, casting, heating, rolling and heat treatment, and the following technical measures are adopted in the production process of the invention:
Smelting and rolling: the molten iron is subjected to deep desulfurization treatment, smelted in an electric furnace, and subjected to LF and VD external refining after tapping, and then pouring is carried out. The steel ingot is heated to 1150-1350 ℃ in a chamber furnace, cogging is carried out after the heat preservation time is more than 2 hours, rolling is carried out after the intermediate billet is cooled slowly and unstacked, the compression ratio of the finished steel plate is effectively guaranteed to be more than 3:1, the cogging temperature is more than or equal to 1100 ℃, the finish rolling temperature is more than or equal to 920 ℃, the rolling speed is controlled to be 1.0-1.5 m/s, and natural stacking and slow cooling are carried out after rolling.
And (3) heat treatment: quenching and tempering heat treatment is carried out by adopting a quenching and tempering mode, and a fine and uniform structure of crystal grains is obtained. The quenching and tempering heat treatment process comprises the following steps: quenching temperature is 850-925 ℃, and heat preservation time is 1-4 min/mm; the tempering temperature is 630-670 ℃, the heat preservation time is 3-7 min/mm, and through sufficient tempering time, tempered bainite with fine grains, uniform structure, high toughness and moderate strength can be obtained, the internal stress of the steel plate can be further eliminated, and simultaneously carbide formed by alloying elements such as Mo and V can be separated out, so that the precipitation strengthening effect is increased, and the steel plate has sufficient toughness.
Has the advantages that:
the invention provides a thick steel with excellent high-temperature performance for a nuclear power safety injection box and a manufacturing method thereof, the thickness of the produced steel plate is 80-150 mm, and the width and the length of the produced steel plate can be produced according to actual requirements. Compared with the prior art, the beneficial effects are as follows:
(1) the thickness of the steel plate is 80-150 mm, steel ingot cogging rolling production is adopted, alloy elements in the steel are controlled, the gas content and the content of nonmetallic inclusions are reduced, a finished steel plate with the maximum thickness of 150mm and the compression ratio of more than 3:1 can be obtained, the steel plate has excellent high-temperature tensile property and toughness, the 150-DEG C high-temperature tensile yield strength of the finished product steel plate with the thickness of 80-150 mm in a quenched and tempered state can reach 500-530 MPa, the tensile strength can reach 610-635 MPa, after simulated postweld heat treatment for 16 hours, the 150-DEG C high-temperature tensile yield strength of the steel plate can reach 500-520 MPa, the tensile strength can reach 610-625 MPa, and in the two states, the-50-DEG C impact toughness of the steel plate can reach 185-277J, and the reduction of area can reach 60-85%.
(2) After quenching and tempering heat treatment and 16-hour simulated postweld heat treatment, the steel grade has better strength levels in different states. After quenching and tempering, the 150 ℃ high-temperature tensile yield strength and tensile strength of a 120mm thick steel plate are 529MPa and 635MPa respectively; after the simulated postweld heat treatment, the 150 ℃ high-temperature tensile yield strength and the tensile strength are 509MPa and 614MPa respectively, and from the results, the 150 ℃ high-temperature tensile strength of the steel plates in different states is greatly improved compared with other steel grades.
(3) The impact absorption energy and the section fiber rate of the steel grade of the invention under different states are also kept at a higher level. The-50 ℃ impact absorption energy of the 120mm steel plate after quenching and tempering and simulated postweld heat treatment is more than 200J, and the section fiber rate can reach more than 65 percent, which shows that the steel grade has good low-temperature toughness.
(4) The Z-direction reduction of area of the steel grade has a higher level, and the Z-direction reduction of area of a 120mm steel plate after quenching and tempering can reach 67.3 percent, which shows that the steel grade has better lamellar tearing resistance.
(5) The invention selects low-P and low-S molten iron, and carries out the processes of deep desulfurization treatment of the molten iron, slag removal by desulfurization, electric furnace smelting, external refining, vacuum treatment and rolling, thereby ensuring higher cleanliness of the molten steel.
Drawings
FIG. 1 is a metallographic structure of example 3; the microstructure is tempered bainite.
Detailed Description
The following examples are intended to illustrate the invention in detail, and are intended to be a general description of the invention, and not to limit the invention.
The smelting chemical components of the steel of each embodiment of the invention are shown in Table 1;
TABLE 1 Steel smelting chemistry of each example, mass%
| Examples | 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 |
And (3) smelting the molten steel in an electric furnace, refining outside the furnace, carrying out vacuum treatment, and casting into steel ingots, wherein the specification of rolled finished steel plates is 80-150 mm. The simulated postweld heat treatment process has the temperature of 615 +/-5 ℃, the heat preservation time of 16h, and the temperature rise and fall rate of more than 400 ℃ of less than or equal to 55 ℃/h.
The rolling process of the steel of each example of the present invention is shown in table 2, and the heat treatment of the steel of each example is shown in table 3; the 150 ℃ high temperature tensile properties of the steel sheets of the examples of the present invention are shown in Table 4; the-50 ℃ impact properties of the steel sheets of the examples of the present invention are shown in Table 5; the Z-direction tensile and cold bending test properties of the steel sheets of the examples of the present invention are shown in Table 6.
TABLE 2 Rolling Process
TABLE 3 Heat treatment Process
TABLE 4 Steel sheet tensile Property results at 150 ℃ C
TABLE 5 impact strength results of steel sheets at-50 deg.C
TABLE 6Z-direction tensile and Cold bending test Performance results of Steel sheets
After the steel plate with the thickness of 80-150 mm is subjected to quenching and tempering heat treatment and simulated postweld heat treatment for 16 hours, the steel plate has good comprehensive mechanical properties, and all performance indexes completely meet the requirements of manufacturing nuclear power safety injection box equipment.
Claims (3)
1. The steel with excellent high-temperature performance and thick specification for the nuclear power safety injection box is characterized by comprising the following chemical components in percentage by mass: c: 0.15% -0.20%, Si: 0.40-0.60%, Mn: 0.32-0.40%, P is less than or equal to 0.008%, S is less than or equal to 0.002%, Mo: 0.30% -0.60%, Ni: 0.55-0.90%, Cr: 0.50-0.80 percent of Cu, less than or equal to 0.05 percent of Alt: 0.016-0.04%, H is less than or equal to 0.00015%, O is less than or equal to 0.0020%, and the balance of Fe and inevitable impurities; after the simulated postweld heat treatment, the tensile strength of the steel plate at the high temperature of 150 ℃ reaches 610-625 MPa, the impact toughness at the temperature of-50 ℃ reaches 185-277J, and the reduction of area reaches 60-85%.
2. The steel for a thick-gauge nuclear power safety injection tank with excellent high-temperature performance as claimed in claim 1, wherein the thickness of the steel plate is 80-150 mm.
3. A production method of the steel for the nuclear power safety injection tank with excellent high-temperature performance and thick specification as claimed in claim 1 or 2, wherein the production process of the steel plate comprises the following steps: smelting, casting, heating, rolling and heat treatment, which is characterized in that,
Deep desulfurization treatment of molten iron, smelting in an electric furnace, performing LF and VD external refining after tapping, and then pouring; heating a steel ingot to 1150-1350 ℃, keeping the temperature for more than 2 hours, cogging after keeping the temperature, rolling after slowly cooling and unstacking an intermediate billet, wherein the compression ratio of a finished steel plate is more than 3:1, the cogging temperature is more than or equal to 1180 ℃, the finish rolling temperature is more than or equal to 920 ℃, the rolling speed is controlled to be 1.0-1.5 m/s, and naturally stacking and slowly cooling after rolling;
Quenching and tempering heat treatment is carried out by adopting a quenching and tempering mode, the quenching temperature is 850-925 ℃, and the heat preservation time is 1-4 min/mm; the tempering temperature is 635-660 ℃, and the heat preservation time is 3-7 min/mm.
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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 |
| 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 |
| 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 |
| CN117165852B (en) * | 2023-08-29 | 2024-10-25 | 南京钢铁股份有限公司 | 18MND5 steel plate for nuclear power safety injection box and production method thereof |
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| JP5924058B2 (en) * | 2011-10-03 | 2016-05-25 | Ｊｆｅスチール株式会社 | High tensile strength steel sheet with excellent low temperature toughness of weld heat affected zone and method for producing the same |
| CN105506508A (en) * | 2014-09-26 | 2016-04-20 | 鞍钢股份有限公司 | Steel for third-generation nuclear power safety injection box base plate and manufacturing method thereof |
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