CN116555604A - Ni-Cr-Fe alloy and method for improving corrosion resistance of plate thereof - Google Patents
Ni-Cr-Fe alloy and method for improving corrosion resistance of plate thereof Download PDFInfo
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- CN116555604A CN116555604A CN202310516856.3A CN202310516856A CN116555604A CN 116555604 A CN116555604 A CN 116555604A CN 202310516856 A CN202310516856 A CN 202310516856A CN 116555604 A CN116555604 A CN 116555604A
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 79
- 239000000956 alloy Substances 0.000 title claims abstract description 79
- 230000007797 corrosion Effects 0.000 title claims abstract description 67
- 238000005260 corrosion Methods 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 60
- 229910019589 Cr—Fe Inorganic materials 0.000 title claims abstract description 47
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- 238000005096 rolling process Methods 0.000 claims abstract description 25
- 238000003723 Smelting Methods 0.000 claims abstract description 13
- 238000005266 casting Methods 0.000 claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 8
- 238000004512 die casting Methods 0.000 claims abstract description 8
- 239000010959 steel Substances 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 102220249738 rs777530225 Human genes 0.000 abstract description 13
- 238000012360 testing method Methods 0.000 abstract description 12
- 239000010935 stainless steel Substances 0.000 abstract description 2
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 2
- 239000013078 crystal Substances 0.000 description 12
- 238000001816 cooling Methods 0.000 description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 10
- 239000006104 solid solution Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 239000000203 mixture Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction 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
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/023—Alloys based on nickel
-
- 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
- C22C19/058—Alloys based on nickel or cobalt based on nickel with chromium without Mo and W
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- 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 belongs to the technical field of stainless steel smelting, and relates to a Ni-Cr-Fe alloy and a method for improving corrosion resistance of a plate thereof. The method for improving the corrosion resistance of the Ni-Cr-Fe alloy plate comprises the following steps: (1) Al and Ti elements are added in the smelting process to obtain molten steel with qualified components; (2) Continuously casting or die casting the molten steel to obtain a casting blank; (3) And carrying out solution heat treatment on the casting blank after rolling to obtain the Ni-Cr-Fe alloy plate. The Ni-Cr-Fe alloy sample is subjected to intergranular corrosion test by adopting an ASTM G28A method, and after the sample is sensitized for 750-30 min, the intergranular corrosion rate of 24 hours is between 0.3 and 1.0mm/a, thereby completely meeting the special requirements of users.
Description
Technical Field
The invention belongs to the technical field of stainless steel smelting, and relates to a Ni-Cr-Fe alloy and a method for improving corrosion resistance of a plate thereof.
Background
The nickel-based alloy has high room temperature and high temperature strength, good oxidation resistance and corrosion resistance, is widely applied to petrochemical industry, energy, machinery, environmental protection and other industries, and is an important material indispensable for economic construction and national defense and military industry. The Ni-Cr-Fe nickel-based alloy has excellent corrosion resistance and is widely applied to petrochemical pipelines and chemical reactors. At present, the corrosion performance of the Ni-Cr-Fe system nickel-based alloy plate is not regulated in the standard ASME SB168, but when the actual equipment of an end user is manufactured, the requirement (ASTM G28A method) on the intergranular corrosion resistance of the plate is put forward, and the sample is generally required to be sensitized for 750-30 min, and then the intergranular corrosion rate is less than or equal to 5.4mm/a for 24h, and the severe requirement is less than or equal to 1mm/a. The performance test data of the current domestic and foreign products has serious fluctuation, and the requirements of customers are hardly met.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art and provides a Ni-Cr-Fe alloy and a method for improving the corrosion resistance of a plate thereof.
Specifically, the method for improving the corrosion resistance of the Ni-Cr-Fe alloy plate provided by the invention comprises the following steps:
(1) Al and Ti elements are added in the smelting process to obtain molten steel with qualified components;
(2) Continuously casting or die casting the molten steel to obtain a casting blank;
(3) And carrying out solution heat treatment on the casting blank after rolling to obtain the Ni-Cr-Fe alloy plate.
According to the method for improving the corrosion resistance of the Ni-Cr-Fe alloy plate, the addition amount of the Al and Ti elements is as follows in percentage by weight: 0.10 to 0.20 percent of Al and 0.10 to 0.30 percent of Ti.
According to the method for improving the corrosion resistance of the Ni-Cr-Fe alloy plate, the addition amount of the Al and Ti elements is as follows in percentage by weight: 0.1 to 0.2 percent of Al and 0.1 to 0.25 percent of Ti.
According to the method for improving the corrosion resistance of the Ni-Cr-Fe alloy plate, the content of C in the Ni-Cr-Fe alloy plate is 0.05-0.10% by weight, and Ti/C is more than or equal to 1.5 and less than or equal to 3.5.
According to the method for improving the corrosion resistance of the Ni-Cr-Fe alloy plate, smelting is electric furnace+electroslag remelting, vacuum induction furnace+electroslag remelting or electric furnace+AOD+LF.
According to the method for improving the corrosion resistance of the Ni-Cr-Fe alloy plate, in the rolling process, the blank heating temperature is 1160-1200 ℃, the finishing temperature is more than or equal to 900 ℃, and water cooling is performed after rolling.
According to the method for improving the corrosion resistance of the Ni-Cr-Fe alloy plate, the temperature of solution heat treatment is 1000-1050 ℃, and the heating time is 2-4min/mm thick.
On the other hand, the Ni-Cr-Fe alloy provided by the invention adopts the method for improving the corrosion resistance of the Ni-Cr-Fe alloy plate in the preparation process.
The Ni-Cr-Fe alloy comprises the following components in percentage by weight: less than or equal to 0.150 percent of C, less than or equal to 0.50 percent of Si, less than or equal to 1.00 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.015 percent of S, 14.00 to 17.00 percent of Cr, more than or equal to 72.00 percent of Ni, less than or equal to 0.50 percent of Cu, 6.00 to 10.00 percent of Fe, 0.10 to 0.20 percent of Al and 0.10 to 0.30 percent of Ti.
The Ni-Cr-Fe alloy comprises the following components in percentage by weight: less than or equal to 0.05-0.10% of C, 0.2-0.4% of Si, 0.5-0.8% of Mn, less than or equal to 0.025% of P, less than or equal to 0.002% of S, 15-17% of Cr, more than or equal to 72% of Ni, less than or equal to 0.3% of Cu, 7-10% of Fe, 0.10-0.20% of Al, 0.10-0.25% of Ti, and less than or equal to 1.5 and less than or equal to 3.5 of Ti/C.
The technical scheme of the invention has the following beneficial effects:
(1) According to the method for improving the corrosion resistance of the Ni-Cr-Fe alloy plate, the Al is added in the smelting process to play a role in strong deoxidization, so that the purity of the alloy is improved; ti is added to play a part of role in fixing C, so that TiC is formed, thereby reducing the intergranular corrosion sensitivity of the alloy and improving the corrosion resistance of the alloy;
(2) The Ni-Cr-Fe alloy is subjected to intergranular corrosion test by adopting an ASTM G28A method, and after a sample is sensitized for 750-30 min, the intergranular corrosion rate of 24 hours is 0.3-1.0 mm/a, thereby completely meeting the special requirements of users.
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.
When a range of values is disclosed herein, the range is considered to be continuous and includes both the minimum and maximum values for the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. Further, when multiple range description features or characteristics are provided, the ranges may be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood to include any and all subranges subsumed therein.
The Ni-Cr-Fe alloy composition control standard was referenced to ASME SB168, and the standard composition control ranges were as follows (wt%).
Since no provision is made for corrosion resistance in the implementation standard ASME SB168, in order for the Ni-Cr-Fe alloy to meet end-user requirements for the corrosion resistance of the sheet, the present invention provides a method for enhancing the corrosion resistance of the Ni-Cr-Fe alloy sheet by improving the composition and process control aspects.
Specifically, the method for improving the corrosion resistance of the Ni-Cr-Fe alloy plate provided by the invention comprises the following steps:
(1) Al and Ti elements are added in the smelting process to obtain molten steel with qualified components;
(2) Continuously casting or die casting the molten steel to obtain a casting blank;
(3) And carrying out solution heat treatment on the casting blank after rolling to obtain the Ni-Cr-Fe alloy plate.
According to the method for improving the corrosion resistance of the Ni-Cr-Fe alloy plate, the Al is added in the smelting process to play a role in strong deoxidization, so that the purity of the alloy is improved; the Ti is added to play a part of role in fixing C, so that TiC is formed, thereby reducing the intergranular corrosion sensitivity of the alloy and improving the corrosion resistance of the alloy.
Preferably, the addition amount of the Al and Ti elements is as follows in percentage by weight: 0.10 to 0.20 percent of Al and 0.10 to 0.30 percent of Ti.
When the addition amount of Al is less than 0.10%, the deoxidizing effect is not obvious; when the addition amount of Al is more than 0.20%, excessive inclusions are generated in the alloy, resulting in rolling cracking. When the addition amount of Ti is less than 0.10%, the carbon fixing effect is not obvious, and excessive free carbon can cause serious intergranular corrosion; when the addition amount of Ti is more than 0.30%, most of C in the alloy is precipitated in a TiC form, the solid solution strengthening C content is insufficient, and the mechanical property and carbonization resistance of the alloy are seriously reduced.
Further preferably, the addition amounts of the Al and Ti elements in weight percent are as follows: 0.10 to 0.20 percent of Al and 0.10 to 0.25 percent of Ti
In practical control, the content of C is not too high, and is generally controlled to be 0.05-0.10%, and Ti/C is not less than 1.5 and not more than 3.5, so that the best matching of carbon fixation and reduction of intergranular corrosion tendency is achieved.
The smelting mode and the steps and technical parameters related to the smelting process of the invention can be carried out according to the prior art, and the invention is not described herein. As examples, the smelting method may be electric furnace+electroslag remelting, vacuum induction furnace+electroslag remelting, electric furnace+aod+lf, and the like.
Preferably, in the rolling process, the blank heating temperature is 1160-1200 ℃, the final rolling temperature is more than or equal to 900 ℃, and the water cooling is carried out after rolling. The temperature interval is the interval with the best thermoplasticity of the alloy, and can avoid rolling cracking.
Preferably, the temperature of the solution heat treatment is 1000-1050 ℃, the heating time is 2-4min/mm thickness, and the water cooling is carried out after the heating is finished. Thereby, an optimal match of organization and performance is obtained.
On the other hand, based on the same inventive concept, the invention also provides a Ni-Cr-Fe alloy, and the preparation process adopts the method for improving the corrosion resistance of the Ni-Cr-Fe alloy plate.
Preferably, the method comprises the following steps in percentage by weight: less than or equal to 0.150 percent of C, less than or equal to 0.50 percent of Si, less than or equal to 1.00 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.015 percent of S, 14.00 to 17.00 percent of Cr, more than or equal to 72.00 percent of Ni, less than or equal to 0.50 percent of Cu, 6.00 to 10.00 percent of Fe, 0.10 to 0.20 percent of Al and 0.10 to 0.30 percent of Ti.
Further preferably, the method comprises the following steps in percentage by weight: less than or equal to 0.05-0.10% of C, 0.2-0.4% of Si, 0.5-0.8% of Mn, less than or equal to 0.025% of P, less than or equal to 0.002% of S, 15-17% of Cr, more than or equal to 72% of Ni, less than or equal to 0.3% of Cu, 7-10% of Fe, 0.10-0.20% of Al, 0.10-0.25% of Ti, and less than or equal to 1.5 and less than or equal to 3.5 of Ti/C.
The Ni-Cr-Fe alloy is subjected to intergranular corrosion test by adopting an ASTM G28A method, and after a sample is sensitized for 750-30 min, the intergranular corrosion rate of 24 hours is 0.3-1.0 mm/a, thereby completely meeting the special requirements of users.
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.
Examples 1-3 and comparative examples 1-6 were summarized in terms of nickel-base alloy ingot composition (wt%)
Example 1
The nickel-base alloy cast ingot is obtained by adopting an electric furnace and electroslag remelting process, wherein the actual components are shown in the table, and the alloy contains 0.13% of Al, 0.18% of Ti and 2.57% of Ti/C=2.57. The cast ingot is forged to be a plate blank. Blank heating temperature 1180 ℃, finish rolling temperature 920 ℃, and water cooling after rolling; the solid solution temperature of the plate is 1020 ℃, the heating time is 4min/mm, and the plate is water-cooled. Sheet gauge 10 x 1500 x 6000mm. And an ASTM G28A method is adopted for carrying out intergranular corrosion test, after the sample is sensitized for 750-30 min, the intergranular corrosion rate is 0.57mm/a (the actual measurement value of the intergranular corrosion of the plate processed by the traditional process is basically 3.7-14 mm/a), and the special requirements of users are completely met.
Example 2
The nickel-base alloy cast ingot is obtained by adopting a vacuum induction furnace and electroslag remelting process, wherein the actual components are shown in the table, and the alloy contains 0.15% of Al, 0.21% of Ti and 3.5% of Ti/C=3.5. The cast ingot is forged to be a plate blank. The blank heating temperature is 1160 ℃, the finish rolling temperature is 900 ℃, and water cooling is carried out after rolling; the solid solution temperature of the plate is 1030 ℃, the heating time is 4min/mm, and the plate is water-cooled. Sheet gauge 10 x 1800 x 6000mm. And an ASTM G28A method is adopted for carrying out intergranular corrosion test, after the sample is sensitized for 750-30 min, the intergranular corrosion rate is 0.37mm/a (the actual measurement value of the intergranular corrosion of the plate processed by the traditional process is basically 3.7-14 mm/a), and the special requirements of users are completely met.
Example 3
The nickel-base alloy cast ingot is obtained by electric furnace+AOD+LF die casting, and the actual components are shown in the table above, wherein Al 0.15%, ti 0.20% and Ti/C=2.86 in the alloy. The cast ingot is forged to be a plate blank. The blank heating temperature is 1160 ℃, the finish rolling temperature is 910 ℃, and water cooling is carried out after rolling; the solid solution temperature of the plate is 1040 ℃, the heating time is 3min/mm, and the plate is water-cooled. Sheet gauge 20 x 1600 x 600mm. And an ASTM G28A method is adopted for carrying out intergranular corrosion test, after the sample is sensitized for 750-30 min, the intergranular corrosion rate is 0.67mm/a (the actual measurement value of the intergranular corrosion of the plate processed by the traditional process is basically 3.7-14 mm/a), and the special requirements of users are completely met.
Comparative example 1
The nickel-base alloy cast ingot is obtained by adopting an electric furnace and electroslag remelting process, wherein the actual components are shown in the table, and the alloy contains 0.05% of Al, 0.02% of Ti and 0.28% of Ti/C=0.28. The cast ingot is forged to be a plate blank. The blank heating temperature is 1180 ℃, the finish rolling temperature is 930 ℃, and the rolled blank is water-cooled; the solid solution temperature of the plate is 1030 ℃, the heating time is 4min/mm, and the plate is water-cooled. Sheet gauge 12 x 1500 x 6000mm. The inter-crystal corrosion test is carried out by adopting an ASTM G28A method, and after the sample is sensitized for 750-30 min, the inter-crystal corrosion rate is 12.3mm/a after 24 hours, and the special requirements of users cannot be met.
Comparative example 2
The nickel-base alloy cast ingot is obtained by adopting an electric furnace and electroslag remelting process, wherein the actual components are shown in the table, and the alloy contains 0.08% of Al, 0.07% of Ti and 0.875% of Ti/C=0.07%. The cast ingot is forged to be a plate blank. Blank heating temperature 1180 ℃, finish rolling temperature 920 ℃, and water cooling after rolling; the solid solution temperature of the plate is 1020 ℃, the heating time is 4min/mm, and the plate is water-cooled. Sheet gauge 10 x 1500 x 6000mm. The inter-crystal corrosion test is carried out by adopting an ASTM G28A method, and after the sample is sensitized for 750-30 min, the inter-crystal corrosion rate is 8.6mm/a after 24 hours, so that the special requirements of users cannot be met.
Comparative example 3
The nickel-base alloy cast ingot is obtained by adopting a vacuum induction furnace and electroslag remelting process, wherein the actual components are shown in the table, and the alloy contains 0.12% of Al, 0.03% of Ti and 0.6% of Ti/C=0.6. The cast ingot is forged to be a plate blank. Heating the blank at 1190 ℃, finishing at 910 ℃, and water-cooling after rolling; the solid solution temperature of the plate is 1030 ℃, the heating time is 4min/mm, and the plate is water-cooled. Sheet gauge 16 x 1500 x 6000mm. The inter-crystal corrosion test is carried out by adopting an ASTM G28A method, and after the sample is sensitized for 750-30 min, the inter-crystal corrosion rate of 24 hours is 7.6mm/a, so that the special requirements of users cannot be met.
Comparative example 4
The nickel-base alloy cast ingot is obtained by electric furnace+AOD+LF die casting, wherein the actual components are shown in the table above, and the alloy contains 0.18% of Al, 0.03% of Ti and 0.6% of Ti/C=0.6. The cast ingot is forged to be a plate blank. Heating the blank at 1190 ℃, finishing the blank at 930 ℃, and cooling the rolled blank by water; the solid solution temperature of the plate is 1020 ℃, the heating time is 4min/mm, and the plate is water-cooled. Sheet gauge 10 x 1500 x 6000mm. The inter-crystal corrosion test is carried out by adopting an ASTM G28A method, and after the sample is sensitized for 750-30 min, the inter-crystal corrosion rate is 6.6mm/a after 24 hours, and the special requirements of users cannot be met.
Comparative example 5
The nickel-base alloy cast ingot is obtained by electric furnace+AOD+LF die casting, and the actual components are shown in the table above, wherein Al 0.02%, ti 0.33% and Ti/C=4.125 in the alloy. The cast ingot is forged to be a plate blank. Blank heating temperature 1180 ℃, finish rolling temperature 920 ℃, and water cooling after rolling; the solid solution temperature of the plate is 1030 ℃, the heating time is 4min/mm, and the plate is water-cooled. Sheet gauge 12 x 1500 x 6000mm. The inter-crystal corrosion test is carried out by adopting an ASTM G28A method, and after the sample is sensitized for 750-30 min, the inter-crystal corrosion rate of 24 hours is 5.9mm/a, so that the special requirements of users cannot be met.
Comparative example 6
The nickel-base alloy cast ingot is obtained by electric furnace+AOD+LF die casting, wherein the actual components are shown in the table above, and the alloy contains 0.03% of Al, 0.29% of Ti and Ti/C=4.14. The cast ingot is forged to be a plate blank. Heating the blank at 1190 ℃, finishing at 910 ℃, and water-cooling after rolling; the solid solution temperature of the plate is 1030 ℃, the heating time is 4min/mm, and the plate is water-cooled. Sheet gauge 10 x 1500 x 6000mm. The inter-crystal corrosion test is carried out by adopting an ASTM G28A method, and after the sample is sensitized for 750-30 min, the inter-crystal corrosion rate of 24 hours is 9.6mm/a, so that the special requirements of users cannot be met.
The present invention has been disclosed above in terms of preferred embodiments, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions equivalent to those of the embodiments are considered to be covered by the scope of the claims of the present invention. The scope of the invention should, therefore, be determined with reference to the appended claims.
Claims (10)
1. A method for improving corrosion resistance of a Ni-Cr-Fe alloy sheet, comprising:
(1) Al and Ti elements are added in the smelting process to obtain molten steel with qualified components;
(2) Continuously casting or die casting the molten steel to obtain a casting blank;
(3) And carrying out solution heat treatment on the casting blank after rolling to obtain the Ni-Cr-Fe alloy plate.
2. The method for improving the corrosion resistance of the Ni-Cr-Fe alloy sheet according to claim 1, wherein the addition amount of the Al and Ti elements is as follows in percentage by weight: 0.10 to 0.20 percent of Al and 0.10 to 0.30 percent of Ti.
3. The method for improving the corrosion resistance of the Ni-Cr-Fe alloy sheet according to claim 1, wherein the addition amount of the Al and Ti elements is as follows in percentage by weight: 0.1 to 0.2 percent of Al and 0.1 to 0.25 percent of Ti.
4. The method for improving the corrosion resistance of a Ni-Cr-Fe alloy sheet according to claim 1, wherein the content of C in the Ni-Cr-Fe alloy sheet is 0.05 to 0.10% by weight and 1.5.ltoreq.Ti/C.ltoreq.3.5.
5. The method for improving the corrosion resistance of a Ni-Cr-Fe alloy sheet according to claim 1, wherein the smelting is electric furnace+electroslag remelting, vacuum induction furnace+electroslag remelting or electric furnace+AOD+LF.
6. The method for improving the corrosion resistance of a Ni-Cr-Fe alloy sheet according to claim 1, wherein the blank heating temperature is 1160-1200 ℃ during rolling, the finishing temperature is not less than 900 ℃, and the rolled blank is water-cooled.
7. The method for improving the corrosion resistance of a Ni-Cr-Fe alloy sheet according to claim 1, wherein the solution heat treatment is carried out at a temperature of 1000 to 1050 ℃ for a heating period of 2 to 4 min/mm.
8. A Ni-Cr-Fe alloy, characterized in that the method for improving the corrosion resistance of a Ni-Cr-Fe alloy sheet according to any one of claims 1-7 is used in the preparation process.
9. The Ni-Cr-Fe alloy of claim 8, wherein the alloy comprises, in weight percent: less than or equal to 0.150 percent of C, less than or equal to 0.50 percent of Si, less than or equal to 1.00 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.015 percent of S, 14.00 to 17.00 percent of Cr, more than or equal to 72.00 percent of Ni, less than or equal to 0.50 percent of Cu, 6.00 to 10.00 percent of Fe, 0.10 to 0.20 percent of Al and 0.10 to 0.30 percent of Ti.
10. The Ni-Cr-Fe alloy of claim 9, wherein the alloy comprises, in weight percent: less than or equal to 0.05-0.10% of C, 0.2-0.4% of Si, 0.5-0.8% of Mn, less than or equal to 0.025% of P, less than or equal to 0.002% of S, 15-17% of Cr, more than or equal to 72% of Ni, less than or equal to 0.3% of Cu, 7-10% of Fe, 0.10-0.20% of Al, 0.10-0.25% of Ti, and less than or equal to 1.5 and less than or equal to 3.5 of Ti/C.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310516856.3A CN116555604A (en) | 2023-05-09 | 2023-05-09 | Ni-Cr-Fe alloy and method for improving corrosion resistance of plate thereof |
Applications Claiming Priority (1)
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| US4626408A (en) * | 1984-09-20 | 1986-12-02 | Nippon Yakin Kogyo Kabushiki Kaisha | Ni-based alloy excellent in intergranular corrosion resistance, stress corrosion cracking resistance and hot workability |
| CN110541090A (en) * | 2019-10-17 | 2019-12-06 | 太原钢铁(集团)有限公司 | Method for improving corrosion performance of nickel-based alloy |
| CN113234964A (en) * | 2021-05-19 | 2021-08-10 | 山西太钢不锈钢股份有限公司 | Nickel-based corrosion-resistant alloy and processing method thereof |
| CN114807646A (en) * | 2022-05-10 | 2022-07-29 | 山西太钢不锈钢股份有限公司 | Nickel-based alloy plate blank and preparation method thereof |
| CN115247225A (en) * | 2022-03-09 | 2022-10-28 | 江西宝顺昌特种合金制造有限公司 | Method for smelting UNS N06600 steel by using intermediate frequency furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4626408A (en) * | 1984-09-20 | 1986-12-02 | Nippon Yakin Kogyo Kabushiki Kaisha | Ni-based alloy excellent in intergranular corrosion resistance, stress corrosion cracking resistance and hot workability |
| CN110541090A (en) * | 2019-10-17 | 2019-12-06 | 太原钢铁(集团)有限公司 | Method for improving corrosion performance of nickel-based alloy |
| CN113234964A (en) * | 2021-05-19 | 2021-08-10 | 山西太钢不锈钢股份有限公司 | Nickel-based corrosion-resistant alloy and processing method thereof |
| CN115247225A (en) * | 2022-03-09 | 2022-10-28 | 江西宝顺昌特种合金制造有限公司 | Method for smelting UNS N06600 steel by using intermediate frequency furnace |
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