CN116926450A - Short-process preparation method of high-Mo nickel-based corrosion-resistant alloy plate - Google Patents
Short-process preparation method of high-Mo nickel-based corrosion-resistant alloy plate Download PDFInfo
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 104
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 66
- 239000000956 alloy Substances 0.000 title claims abstract description 66
- 230000007797 corrosion Effects 0.000 title claims abstract description 52
- 238000005260 corrosion Methods 0.000 title claims abstract description 52
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 claims abstract description 31
- 238000005098 hot rolling Methods 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 238000000265 homogenisation Methods 0.000 claims abstract description 12
- 239000002253 acid Substances 0.000 claims abstract description 8
- 238000000137 annealing Methods 0.000 claims abstract description 8
- 238000005406 washing Methods 0.000 claims abstract description 7
- 230000009467 reduction Effects 0.000 claims abstract description 6
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- 238000005096 rolling process Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 238000004321 preservation Methods 0.000 abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 20
- 239000012071 phase Substances 0.000 description 13
- 238000005242 forging Methods 0.000 description 11
- 238000012545 processing Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 239000000047 product Substances 0.000 description 7
- 229910001566 austenite Inorganic materials 0.000 description 6
- 238000005266 casting Methods 0.000 description 4
- 239000007769 metal material Substances 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000001687 destabilization Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
- 238000010587 phase diagram Methods 0.000 description 3
- 238000005554 pickling Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000007655 standard test method Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007791 liquid phase 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
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
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- 238000001953 recrystallisation Methods 0.000 description 1
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- 230000035945 sensitivity Effects 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/46—Roll speed or drive motor control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
-
- 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
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/056—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 10% but less than 20%
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
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- Chemical & Material Sciences (AREA)
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- 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 invention provides a short-process preparation method of a high Mo nickel-based corrosion-resistant alloy plate, which comprises the following steps: (1) carrying out homogenization treatment and heating and heat preservation treatment on the cast ingot; (2) Carrying out hot rolling treatment on the cast ingot by adopting a reduction of more than 55% to obtain a hot rolled plate; and (3) carrying out annealing treatment and acid washing treatment on the hot rolled plate. The short-process preparation method has the advantages of remarkably improving production efficiency, saving energy and reducing carbon emission.
Description
Technical Field
The invention relates to the technical field of production and manufacturing of nickel-based corrosion-resistant alloy plates, in particular to a short-flow preparation method of a high-Mo nickel-based corrosion-resistant alloy plate.
Background
In the important fields of energy, nuclear power, environmental protection and the like related to national folk life, the material has higher and higher requirements on various service performances. The nickel-based corrosion-resistant alloy is applied to various extreme corrosion environments by virtue of the excellent corrosion resistance, so that the nickel-based corrosion-resistant alloy becomes a long-term non-aging metal corrosion-resistant material. Among the nickel-based corrosion-resistant alloys, the high Mo nickel-based corrosion-resistant alloy has been highly paid attention to by research institutions and manufacturers at home and abroad by virtue of its excellent corrosion resistance in both oxidizing and non-oxidizing acids.
In the actual production process, the hot working refers to plastic working deformation of the metal material at a temperature higher than the recrystallization temperature, and in the process, the metal material is dynamically softened, the deformation resistance is relatively small, and the ingot is easily processed into the required shape and size. The traditional production process of the nickel-based alloy plate comprises the steps of vacuum smelting, homogenization treatment, forging cogging, hot rolling into a plate, pickling and plate finishing, wherein the thermal deformation process comprises two stages, namely a primary thermal processing stage represented by the forging cogging and a secondary thermal processing stage represented by the hot rolling of the forging blank into a hot rolled plate by using a hot rolling mill. The deformation of each pass of engineering in the primary hot working stage is about 30%, and the deformation of the engineering in the secondary hot working stage is reasonably designed according to the specification requirement of the product.
However, the traditional nickel-based alloy production process path needs two procedures of ingot cogging and hot rolling to plate for hot working production, and has the defects and disadvantages of longer production flow, lower production efficiency and alloy yield, energy waste caused by repeated heating of the ingot blank and the forging blank, and the like.
In order to solve the problems, a short-flow preparation method for producing the high-Mo nickel-based corrosion-resistant alloy plate with low cost and high efficiency is continuously provided.
Disclosure of Invention
In view of the above problems, the invention provides a short-process preparation method of a high-Mo nickel-based corrosion-resistant alloy plate, which directly hot-rolls a high-Mo nickel-based alloy cast ingot into a plate, reduces a cogging process, avoids various difficulties and problems caused by long traditional process flow, can obviously improve production efficiency, saves energy and reduces carbon emission.
Specifically, the invention is realized by the following technical scheme:
a short-process preparation method of a high Mo nickel-based corrosion-resistant alloy plate comprises the following steps:
(1) Homogenizing and heating and preserving heat of the cast ingot;
(2) Carrying out hot rolling treatment on the cast ingot by adopting a reduction of more than 55% to obtain a hot rolled plate;
(3) And (5) carrying out annealing treatment and acid washing treatment on the hot rolled plate.
Optionally, the ingot comprises, in weight percent: less than or equal to 0.01 percent of C, less than or equal to 0.08 percent of Si, less than or equal to 1.0 percent of Mn, less than or equal to 0.04 percent of P, less than or equal to 0.03 percent of S, 14.5 to 16.5 percent of Cr, 15.0 to 17.0 percent of Mo, 3.0 to 4.5 percent of W, 4.0 to 7.0 percent of Fe, and the balance of Ni and unavoidable impurities.
Optionally, the diameter of the ingot is 350mm.
Optionally, in the step (1), the homogenization treatment temperature is 1180-1220 ℃, and the heat preservation time is more than or equal to 36 hours.
Optionally, in the step (1), the temperature of the heating and heat preservation treatment is greater than or equal to 1230 ℃, and the heat preservation time is greater than or equal to 180 minutes.
Optionally, in step (2), the hot rolling includes rough rolling the ingot to 25 to 55mm at 1150 ℃ or higher and then finish rolling at 1000 ℃ or higher.
Optionally, in step (3), the annealing treatment is performed at a temperature of 1180 ℃ to 1220 ℃ for 48 to 52 minutes.
The high Mo nickel-based corrosion-resistant alloy plate prepared by the short-process preparation method.
Optionally, at room temperature, the elongation percentage of the high Mo nickel-based corrosion-resistant alloy plate is more than or equal to 45%, the tensile strength is more than or equal to 750MPa, the yield strength is more than or equal to 350MPa, and the hardness HRB is less than or equal to 95.
Optionally, the elongation percentage of the high Mo nickel-based corrosion-resistant alloy plate is more than or equal to 60%, the tensile strength is more than or equal to 500MPa, and the yield strength is more than or equal to 175MPa at 800 ℃.
According to the technical scheme, the short-process preparation method of the high-Mo nickel-based corrosion-resistant alloy plate has at least the following beneficial effects:
according to the invention, by selecting a reasonable casting blank heating system, through large deformation in the thermal deformation process and matching reasonable rolling speed, temperature in the rolling process and other technological measures, the heat plasticity is improved, the sensitivity of crack generation is reduced, the large-size precipitated phase is reduced or eliminated, and a better tissue foundation is provided for the tissue control of the high-Mo nickel-based corrosion-resistant alloy plate.
The short-flow preparation method for directly and largely deforming the cast ingot for hot rolling production not only reduces a cogging process, but also greatly improves the production efficiency and saves energy. Finally, the high Mo nickel-based corrosion-resistant alloy plate is a single austenite structure distributed with twin crystals, and has excellent high-temperature and room-temperature mechanical properties.
Drawings
Fig. 1 shows a thermodynamic equilibrium phase diagram of a high Mo nickel-based corrosion resistant alloy calculated by thermodynamic calculation software Thermol-Calc, wherein (a) is an original drawing of the phase diagram and (b) is a partial enlarged drawing.
Fig. 2 is a thermal processing diagram of an as-cast high Mo nickel-based corrosion resistant alloy, wherein (a), (b), (c), and (d) correspond to thermal processing diagrams at true strains of 0.2, 0.4, 0.6, and 0.8 (about 20%, 30%, 45%, and 55%, respectively, for engineering strains) for the as-cast high Mo nickel-based corrosion resistant alloy, respectively.
FIG. 3 is a microstructure of a high Mo nickel base corrosion resistant alloy hot plate produced in example 1 of this invention.
FIG. 4 is a microstructure of a high Mo nickel based corrosion resistant alloy hot plate produced in comparative example 1 of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments for a full understanding of the objects, features, and effects of the present invention. The process of the present invention is carried out by methods or apparatus conventional in the art, except as described below. The following terms have the meanings commonly understood by those skilled in the art unless otherwise indicated.
The traditional nickel-based alloy production process has the defects of longer production flow, lower production efficiency and alloy yield, energy waste caused by repeated heating of casting blanks and forging blanks, and the like. In recent years, with the gradual popularization and application of a high-pressure hot rolling mill, a short-flow process of directly hot-rolling an alloy ingot into a plate becomes new possibility, and the high-Mo nickel-based corrosion-resistant alloy has not been studied and applied in detail at present. The invention provides a short-process preparation method of a high-Mo nickel-based corrosion-resistant alloy with low cost and high production efficiency, which is to directly hot-roll a high-Mo nickel-based alloy cast ingot into a plate, reduce a cogging process, avoid various difficulties and problems caused by long traditional process flow, remarkably improve the production efficiency, save energy and reduce carbon emission.
In order to achieve the above purpose, the main technical idea of the invention is as follows: the traditional secondary thermal deformation production process of the high Mo nickel-based corrosion-resistant alloy plate is shortened to a short-flow production process of primary thermal deformation through a reasonable production process, the specific production flow comprises vacuum smelting, homogenization treatment, direct hot rolling into a plate, acid washing and plate finished product, and the further improvement of the efficiency is realized on the basis of reducing the production cost. In order to ensure smooth development of short-flow process paths and finally obtain a high-quality and stable hot plate product, detailed study on the thermal deformation behavior of a high-Mo nickel-based corrosion-resistant alloy cast ingot in the direct hot rolling plate forming process is needed, and scientific and reasonable matching of all the processes is realized according to the component characteristics of the alloy.
The short-process preparation method provided by the invention aims at high Mo nickel-based corrosion-resistant alloy, and the components are shown in table 1.
TABLE 1 (Unit: wt%)
| C | Si | Mn | P | S | Cr | Mo | W | Fe | Ni |
| ≤0.01 | ≤0.08 | ≤1.0 | ≤0.04 | ≤0.03 | 14.5-16.5 | 15.0-17.0 | 3.0-4.5 | 4.0-7.0 | Allowance of |
As can be seen from Table 1, a large amount of corrosion resistant elements such as Mo and Cr are added to the alloy, so that the alloy has excellent corrosion resistance. However, at the same time, a large amount of second phases are easy to separate out when the alloy is solidified, cooled and is in long-term service in a high-temperature environment, the subsequent production, processing and the service performance of the final product are seriously damaged, the solid solution strengthening effect is obvious due to the large amount of added alloy elements, the production difficulty of hot processing and cold deformation of the alloy is increased, and higher requirements are put on the equipment capacity and the process control level.
After the high Mo nickel-based corrosion-resistant alloy is subjected to vacuum smelting, a large amount of precipitated phases exist in the cast ingot. Fig. 1 shows a thermodynamic equilibrium phase diagram of a high Mo nickel-based corrosion resistant alloy calculated using thermodynamic calculation software Thermol-Calc. The result shows that the alloy obtains a single-phase austenite structure gamma phase by liquid phase solidification; when the temperature is reduced to about 1110 ℃, firstly, an M6C phase is precipitated in an austenite matrix, and the content of the M6C phase is always kept below 0.4 percent although the content is increased along with the reduction of the temperature; when the temperature is reduced to below 1030 ℃, a large amount of mu phase is precipitated from an austenite structure, and the content is increased continuously along with the reduction of the temperature; when the temperature is further reduced to 500 ℃, the equilibrium content of mu phase can reach more than 25%, and the mu phase becomes the most main precipitated phase of the alloy. The precipitated phases narrow the thermal processing temperature range of the alloy, seriously reduce the thermal processing performance of the alloy, and easily generate cracking defects in the subsequent cogging process, so that reasonable and effective homogenization treatment is required. The element segregation, precipitated phase dissolution, high-temperature oxidation and other factors in the homogenization process of the high-Mo nickel-based corrosion-resistant alloy are comprehensively considered, and reasonable homogenization process parameters for the alloy phi 350mm electroslag ingot are kept at 1200+/-20 ℃ for 36 hours.
As the hot working performance of the nickel-based corrosion-resistant alloy cast structure is less studied, the simulation forging cogging is mainly adopted. The engineering deformation of each pass of forging cogging is about 30% (corresponding to true strain of about 0.36), and the requirement of researching a short-flow preparation process of a direct hot rolled plate cannot be met. Therefore, the casting blank subjected to homogenization treatment of the high-Mo nickel-based corrosion-resistant alloy is used as a research object, a Gleeble-3800 thermodynamic simulation tester is adopted to carry out a thermal compression test with the true strain capacity of 0.8 (about 55% of engineering strain capacity), a corresponding thermal deformation constitutive equation and a thermal processing diagram are constructed, and a theoretical basis is provided for the establishment and optimization of thermal processing technological parameters of a direct hot-rolled plate. FIG. 2 shows that the true strain amounts of the as-cast high Mo nickel-based corrosion resistant alloy are 0.2, 0.4, 0.6 and 0.8, respectively (for engineering strain amounts, respectively)About 20%, 30%, 45%, and 55%). As can be seen from the figure, the destabilization regions are mainly found in the low-temperature high-strain rate region (1000 ℃/10 s) -1 ) A vicinity; when the deformation temperature is continuously increased and the strain rate is continuously reduced, the instability region is gradually reduced; when the strain amount is small, the area of the destabilization area is large, and as the strain amount is increased, the area of the destabilization area gradually reduces and gradually tends to be stable. In actual production, high-temperature low-speed rolling is adopted as much as possible in the initial stage of hot rolling, the rolling speed can be gradually increased along with the increase of the deformation, and the whole hot rolling process has extremely high requirements on temperature control and rhythm matching.
Based on the above researches of the inventor, the invention provides a short-process preparation method for producing a high-Mo nickel-based corrosion-resistant alloy plate with low cost and high efficiency, which comprises the following steps: (1) carrying out homogenization treatment and heating and heat preservation treatment on the cast ingot; (2) Carrying out hot rolling treatment on the cast ingot by adopting a reduction of more than 55% to obtain a hot rolled plate; and (3) carrying out annealing treatment and acid washing treatment on the hot rolled plate.
In a preferred embodiment, the short-process preparation method of the invention is directed to ingots having a diameter of 350mm. The short-process preparation method for producing the high-Mo nickel-based corrosion-resistant alloy plate with low cost and high efficiency comprises the following steps:
(1) Firstly, homogenizing the cast ingot, wherein the homogenizing temperature is 1180-1220 ℃, and the heat preservation time is more than or equal to 36 hours. Then heating and preserving heat, wherein the temperature of the heating and preserving heat is more than or equal to 1230 ℃, and the preserving heat time is more than or equal to 180 minutes.
(2) The casting blank is firstly rough rolled to 25-55 mm at a low speed above 1150 ℃, and then finish rolled at a high speed above 1000 ℃ to obtain the hot rolled plate with the target thickness.
(3) The hot rolled plate is annealed at 1180-1220 deg.c for 48-52 min. And then carrying out acid washing, wherein the specific operation of the acid washing can refer to related schemes in the prior art, and the description is omitted herein.
By means of the method, the high Mo nickel-based corrosion-resistant alloy plate finally obtained is a single austenite structure distributed with twin crystals, has excellent high-temperature and room-temperature mechanical properties, and has the elongation rate of more than or equal to 45%, the tensile strength of more than or equal to 750MPa, the yield strength of more than or equal to 350MPa and the hardness HRB of less than or equal to 95; the elongation rate is more than or equal to 60 percent, the tensile strength is more than or equal to 500MPa, and the yield strength is more than or equal to 175MPa at 800 ℃.
Examples
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention. The experimental methods without specific conditions noted in the following examples follow conventional methods and conditions.
The test method in the examples is first described as follows:
the normal temperature tensile property of the alloy plate is detected according to the standard ASTM A370 test method and definition of mechanical Properties of Steel products; hardness performance the Rockwell hardness is measured according to the standard ASTM E18 Standard test method for Rockwell hardness of metallic Material; the high temperature mechanical properties of the sheet were measured according to the standard ASTM E21 Standard test method for high temperature tensile testing of metallic materials.
Example 1:
the composition of the high Mo nickel-based corrosion resistant alloy of this example is shown in table 2.
The cast ingot of the embodiment is a high Mo nickel-based corrosion-resistant alloy cast ingot produced by adopting a VIM+ESR duplex process, and the dimension specification is phi 350mm multiplied by 3000mm;
the short-flow preparation process of the high Mo nickel-based corrosion-resistant alloy plate comprises the following steps:
(1) Preserving the temperature of the cast ingot at 1200 ℃ for 36 hours for homogenization treatment, then heating the cast blank, controlling the temperature to 1250 ℃, and preserving the temperature for 210 minutes;
(2) Directly hot-rolling the cast ingot treated in the step (1) to 50mm at the temperature of 1150 ℃ or higher, and then finish-rolling at the temperature of 1000-1050 ℃ to obtain a hot-rolled plate with the thickness of 20 mm;
(3) And (3) carrying out annealing heat treatment on the hot-rolled plate at 1200 ℃ for 50min, and pickling to obtain a hot-rolled plate finished product.
Comparative example 1:
the compositions of the high Mo nickel-based corrosion resistant alloy of this comparative example are shown in table 2.
The ingot of this comparative example was obtained in the same manner as in example 1, and the dimensional specification was the same as in example 1.
The comparative example uses the traditional forging cogging and hot rolling plate process route to produce the hot rolled plate, and the preparation process is as follows:
(1) Preserving the temperature of the cast ingot at 1200 ℃ for 36 hours for homogenization treatment, then heating the cast blank, controlling the temperature to 1250 ℃, and preserving the temperature for 210 minutes;
(2) Firstly forging the cast ingot treated in the step (1) into a slab with the thickness of 150mm by using a quick forging machine, wherein the whole forging process needs to ensure that the temperature of the cast ingot is kept above 1000 ℃, and returning to a furnace to keep the temperature at 1250 ℃ for more than or equal to 120 minutes if the temperature is insufficient;
(3) Reheating the slab processed in the step (2), controlling the temperature to 1250 ℃, preserving heat for 120min, and rolling the slab into a hot rolled plate with the thickness of 20mm by using a hot rolling mill;
(4) And (3) carrying out annealing heat treatment on the hot-rolled plate at 1200 ℃ for 50min, and pickling to obtain a hot-rolled plate finished product.
TABLE 2 (Unit: wt%)
| C | Si | Mn | P | S | Cr | Mo | W | Fe | Ni | |
| Standard of | ≤0.01 | ≤0.08 | ≤1.0 | ≤0.04 | ≤0.03 | 14.5-16.5 | 15.0-17.0 | 3.0-4.5 | 4.0-7.0 | Allowance of |
| Example 1 | 0.007 | 0.04 | 0.52 | 0.008 | 0.002 | 15.22 | 15.56 | 3.35 | 6.24 | Allowance of |
| Comparative example 1 | 0.007 | 0.05 | 0.51 | 0.007 | 0.003 | 15.30 | 15.52 | 3.31 | 6.28 | Allowance of |
The high temperature and room temperature mechanical properties of the hot rolled plates of the examples and the comparative examples were measured, and the metallographic structure was analyzed, and the results are shown in Table 3, and FIG. 3 and FIG. 4. As can be seen by combining table 3 with reference to fig. 3 and 4, the high Mo nickel-based corrosion resistant alloy hot rolled sheet produced in example 1 of the present invention and the sheet produced by the conventional process route (i.e., comparative example 1) are both single austenite structures containing a large amount of twinning, and the average grain size of the metallographic structures of both are measured by using the intercept method, which shows that the final hot rolled sheet grains are finer in comparison example due to the larger single deformation of the examples, and the strength and elongation at high temperature and normal temperature are slightly better than those of the comparison example. Therefore, the invention shortens the production flow, saves the production time, reduces the cost and has better product performance on the premise of not reducing the quality of the final product, thereby improving the competitiveness of the final product.
TABLE 3 Table 3
The foregoing examples are illustrative of the present invention and are not intended to be limiting, and any other substitutions, modifications, combinations, alterations, simplifications, etc. which do not depart from the spirit and principles of the present invention are intended to be within the scope of the present invention.
Claims (10)
1. The short-process preparation method of the high Mo nickel-based corrosion-resistant alloy plate is characterized by comprising the following steps of:
(1) Homogenizing and heating and preserving heat of the cast ingot;
(2) Carrying out hot rolling treatment on the cast ingot by adopting a reduction of more than 55% to obtain a hot rolled plate;
(3) And (5) carrying out annealing treatment and acid washing treatment on the hot rolled plate.
2. The short-process manufacturing method according to claim 1, wherein the ingot comprises, in weight percent: less than or equal to 0.01 percent of C, less than or equal to 0.08 percent of Si, less than or equal to 1.0 percent of Mn, less than or equal to 0.04 percent of P, less than or equal to 0.03 percent of S, 14.5 to 16.5 percent of Cr, 15.0 to 17.0 percent of Mo, 3.0 to 4.5 percent of W, 4.0 to 7.0 percent of Fe, and the balance of Ni and unavoidable impurities.
3. The short-process production method according to claim 1, wherein the diameter of the ingot is 350mm.
4. The short-process preparation method according to claim 3, wherein in the step (1), the homogenization treatment is carried out at 1180 to 1220 ℃ for a period of not less than 36 hours.
5. The short-process preparation method according to claim 3, wherein in the step (1), the temperature of the heating and heat-preserving treatment is not less than 1230 ℃, and the heat-preserving time is not less than 180 minutes.
6. The short-process production method according to claim 3, wherein in the step (2), the hot rolling comprises rough rolling the ingot to 25 to 55mm at 1150 ℃ or higher and then finish rolling at 1000 ℃ or higher.
7. The short-process production method according to claim 3, wherein in the step (3), the annealing treatment is performed at 1180 to 1220℃for 48 to 52 minutes.
8. A high Mo nickel-based corrosion resistant alloy sheet material prepared by the short flow preparation method of any one of claims 1 to 7.
9. The high Mo nickel-based corrosion resistant alloy sheet material according to claim 8, wherein the elongation is not less than 45%, the tensile strength is not less than 750MPa, the yield strength is not less than 350MPa, and the hardness HRB is not more than 95 at room temperature.
10. The high Mo nickel-based corrosion resistant alloy sheet material according to claim 8, wherein the elongation is not less than 60%, the tensile strength is not less than 500MPa, and the yield strength is not less than 175MPa at 800 ℃.
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