CN114150115A - Annealing method of intergranular corrosion resistant high-chromium super ferrite stainless steel plate - Google Patents
Annealing method of intergranular corrosion resistant high-chromium super ferrite stainless steel plate Download PDFInfo
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- 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
- C21D1/26—Methods of annealing
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- 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
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- 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
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- 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
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Abstract
The invention discloses an annealing method of a high-chromium super ferrite stainless steel plate resistant to intercrystalline corrosion, belongs to the technical field of heat treatment, and solves the technical problem that the intercrystalline corrosion sensitivity of the high-chromium super ferrite stainless steel plate is higher under the existing annealing process. The invention comprises the following steps: firstly, recrystallizing and annealing a high-chromium super ferrite stainless steel cold-rolled plate, and cooling to a homogenization treatment temperature; and then, preserving the fully recrystallized high-chromium super ferrite stainless steel plate at the homogenization treatment temperature for a short time, and quickly cooling to room temperature.
Description
Technical Field
The invention belongs to the technical field of heat treatment, and particularly relates to an annealing method of a high-chromium super ferrite stainless steel plate resistant to intercrystalline corrosion.
Background
The high-chromium super ferrite stainless steel has excellent corrosion resistance and comprehensive mechanical property, and can be used in seawater environment and high-content Cl—In the chemical industry for a long time. Super ferritic stainless steel has gradually replaced titanium, copper, super austenitic stainless steel and super duplex stainless steel in many industries, and a large amount of noble metal resources such as nickel, copper, titanium and the like are saved.
The ferritic stainless steel is a body-centered cubic lattice, is an interstitial solid solution with carbon dissolved in alpha-Fe, has a carbon dissolving capacity much smaller than that of austenitic stainless steel, has a maximum carbon dissolving amount of only 0.0218% and is far less than the maximum carbon dissolving amount of austenite by 2.11%, has a sensitization process dynamics different from that of austenitic stainless steel, does not need sensitization treatment like austenitic stainless steel, and can precipitate chromium-rich carbon and chromium nitrides along grain boundaries in a rapid cooling process after annealing to form a chromium-poor area at the grain boundaries, which is related to the extremely low solubility of carbon and nitrogen in the ferritic stainless steel and the diffusion speed of carbon, nitrogen and chromium atoms in the ferrite is far higher than that in the austenite, so that the ferritic stainless steel is more easily sensitized and has higher intergranular corrosion sensitivity. In general, high-chromium super-ferritic stainless steel is added with stabilizing elements niobium and titanium to generate niobium-titanium carbonitride with carbon and nitrogen so as to achieve the effect of fixing carbon and nitrogen, however, after high-temperature (> 950 ℃) heat treatment, carbon and nitride are mostly dissolved in a matrix to release the fixed carbon and nitrogen, and even under the condition of water quenching, carbon and nitrogen which are partially gathered on a grain boundary and chromium which is adjacent to the grain boundary are not inhibited from being precipitated on the grain boundary in the form of chromium carbide and chromium nitride, so that a chromium-poor area is generated near the grain boundary, and an intergranular corrosion phenomenon is easy to occur in a corrosion environment.
Disclosure of Invention
In order to overcome the defects in the prior art and solve the technical problem that the intercrystalline corrosion sensitivity of the high-chromium super ferrite stainless steel plate is higher under the existing annealing process (only adopting a recrystallization annealing process), the invention provides an annealing method of the intercrystalline corrosion resistant high-chromium super ferrite stainless steel plate. The invention adopts a double annealing process of recrystallization annealing process and homogenization treatment to ensure the mechanical property of the high-chromium super ferrite stainless steel and improve the intergranular corrosion resistance of the high-chromium super ferrite stainless steel.
The design concept of the invention is as follows: the existing annealing process of the high-chromium super ferrite stainless steel cold-rolled plate only carries out recrystallization annealing and fast cooling to room temperature, the crystal grains are recrystallized and simultaneously subjected to high-temperature sensitization, most of carbon and nitride formed by stabilizing elements (Nb and Ti) are dissolved in a matrix, and the fixed carbon and nitrogen are released.
The invention firstly controls the recrystallization temperature to ensure the full recrystallization of the crystal grains and controls the size of the crystal grains to meet the subsequent processing performance; secondly, according to the characteristic that chromium atoms in the ferritic stainless steel are diffused quickly, selecting a reasonable homogenization treatment system: the temperature is 750-830 ℃, the heat preservation time is 1.5-2.5 min/mm, the diffusion capacity of chromium atoms is enough to diffuse towards the grain boundary in the temperature range to compensate the chromium content of the chromium-poor area, so that the chromium-poor degree of the chromium-poor area is reduced or even disappears, meanwhile, the temperature range is just the stabilizing treatment temperature containing stabilizing elements (Nb and Ti), and the formation of Ti (C, N) and Nb (C, N) deprives C and N in chromium-rich carbon and nitrides, so that the formation amount of harmful chromium-rich carbon and nitrides is reduced, and the intergranular corrosion resistance of the steel is improved.
Compared with the prior art, the invention is realized by the following technical scheme.
An annealing method of a high-chromium super ferrite stainless steel plate resistant to intercrystalline corrosion comprises the following steps:
s1, recrystallization annealing: carrying out recrystallization annealing on the cold-rolled high-chromium super ferrite stainless steel plate blank, wherein the recrystallization annealing temperature is 1040-1080 ℃, the heat preservation time is 1-1.5 min/mm, and the heating furnace atmosphere is air or hydrogen atmosphere; cooling the slab to 750-830 ℃ after recrystallization annealing at a cooling speed of 45-50 ℃/s; the purpose of step S1 is to fully recrystallize the cold-rolled sheet and control the grain size to ensure the mechanical properties and workability of the finished sheet, which would result in insufficient recrystallization if the recrystallization annealing temperature is lower than 1040 ℃; the recrystallization annealing temperature is higher than 1080 ℃, crystal grains can grow rapidly, and good mechanical properties are difficult to obtain;
s2, homogenization treatment: homogenizing the plate blank cooled in the step S1, wherein the homogenizing temperature is 750-830 ℃, the heat preservation time is 1.5-2.5 min/mm, and the heating furnace atmosphere is air or hydrogen; and (3) quickly cooling the plate blank to room temperature after homogenization treatment, wherein the cooling speed is not less than 70 ℃/s. Through the step S2, chromium atoms can be fully diffused to the grain boundary chromium-poor region, the chromium-poor degree of the chromium-poor region is reduced, Ti (C, N) and Nb (C, N) are formed at the same time, part of C and N are abstracted, the formation amount of chromium-rich carbon and nitride is reduced, and the precipitation of other harmful phases is effectively inhibited by adopting a rapid cooling method. If the diffusion capacity of chromium atoms is limited in short-time heat preservation at the homogenization temperature of less than 750 ℃, the chromium-poor degree of the crystal boundary of a heat affected zone is not sufficiently compensated, so that the intergranular corrosion resistance of the material is difficult to improve; if the homogenization temperature is less than 750 ℃ for long-time heat preservation, chromium atoms can also diffuse to the grain boundary for a long time to make up a grain boundary chromium-poor area, but the on-site production rhythm is not adapted due to too long time, and the production efficiency is reduced. If the homogenization temperature is more than 830 ℃, because the high-chromium super-ferrite stainless steel contains higher other alloy elements, chromium-rich intermetallic compounds (sigma, chi, Laves and the like) can be precipitated in the grain boundary within a short time when the homogenization temperature is too high, the phenomenon of chromium depletion in the grain boundary can also be caused, and the aim of eliminating the chromium depletion region in the grain boundary to reduce the intergranular corrosion sensitivity is difficult to achieve.
Further, the high-chromium super ferrite stainless steel comprises the following components in percentage by weight: c: less than or equal to 0.03 percent; si: less than or equal to 1.00 percent; mn: less than or equal to 1.00 percent; s: less than or equal to 0.03 percent; cr: 27.0-35.0%; mo: 3.0-4.0%; ni: 0 to 3.0 percent; n: less than or equal to 0.04 percent; ti + Nb: 0.20-1.0% and more than or equal to 6 (C + N); the balance being Fe and unavoidable impurities.
Compared with the prior art, the invention has the beneficial effects that:
the annealing method of the intergranular corrosion resistant high-chromium super ferrite stainless steel plate ensures the mechanical property of the high-chromium super ferrite stainless steel and improves the intergranular corrosion resistance of the high-chromium super ferrite stainless steel. The application range of the high-chromium super ferrite stainless steel is expanded, the popularization of the high-chromium super ferrite stainless steel is facilitated, and the use of noble metals such as Ni, Ti and the like is saved.
Drawings
FIG. 1 shows the surface morphology of a plate after the plate is subjected to a Y method detection test in the detection procedure of the intergranular corrosion sensitivity of the ferritic stainless steel in ASTM A763-1993 (R2009) by adopting 1040 ℃ recrystallization annealing, holding time of 1.5min, quick cooling to the homogenization treatment temperature of 780 ℃, holding time of 2.5min and quick cooling in example 1.
FIG. 2 shows the surface morphology of the plate after the plate is subjected to the Y method detection test in the detection procedure of the intergranular corrosion sensitivity of the ferritic stainless steel in ASTM A763-1993 (R2009) in example 2 by adopting recrystallization annealing at 1050 ℃, heat preservation time of 1.5min, quick cooling to the homogenization treatment temperature of 800 ℃, heat preservation time of 2min and quick cooling.
FIG. 3 shows the surface morphology of the plate after the plate is subjected to the Y method detection test in the detection protocol of the intergranular corrosion sensitivity of the ferritic stainless steel in ASTM A763-1993 (R2009) in example 3 by adopting the recrystallization annealing at 1060 ℃ for 1min, and fast cooling to the homogenization treatment temperature of 830 ℃, and the heat preservation time of 1.5 min.
FIG. 4 shows the surface morphology of the plate of comparative example 1 after the test by Y method in the test procedure of ASTM A763-1993 (R2009) ferritic stainless steel intergranular corrosion sensitivity, which only adopts recrystallization annealing at 1060 ℃, heat preservation time of 1.5min, and fast cooling.
FIG. 5 shows the surface morphology of the plate after the test of the comparative example 2 by the Y method in the detection protocol of the intergranular corrosion sensitivity of ASTM A763-1993 (R2009) ferritic stainless steel, wherein the recrystallization annealing at 1040 ℃ is adopted, the heat preservation time is 1.5min, the rapid cooling is carried out to the homogenization treatment temperature of 900 ℃, the heat preservation time is 1min, and the rapid cooling is carried out.
FIG. 6 shows the surface morphology of the plate after the test is detected by the Y method in the detection procedure of the intergranular corrosion sensitivity of the ferritic stainless steel in ASTM A763-1993 (R2009) in comparative example 3 by adopting recrystallization annealing at 1000 ℃ for 1.5min, and rapid cooling to the homogenization treatment temperature of 780 ℃ for 2.5 min.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. Unless otherwise specified, the examples follow conventional experimental conditions. In addition, it will be apparent to those skilled in the art that various modifications or improvements can be made to the material components and amounts in these embodiments without departing from the spirit and scope of the invention as defined in the appended claims.
The invention is further explained in detail by taking S44660 high-chromium super ferritic stainless steel plate with the thickness of 1mm as an example, the chemical components of the steel plate are C: 0.027%; si: 0.97 percent; mn: 0.95 percent; s: 0.018%; cr: 26.24 percent; mo: 3.12 percent; ni: 2.96 percent; n: 0.037%; ti: 0.26 percent; nb: 0.32 percent; the balance being Fe.
Example 1
An annealing method of a high-chromium super ferrite stainless steel plate resistant to intercrystalline corrosion comprises the following steps:
s1, recrystallization annealing: carrying out recrystallization annealing on the cold-rolled high-chromium super ferrite stainless steel plate blank, wherein the recrystallization annealing temperature is 1040 ℃, the heat preservation time is 1.5min, and the atmosphere of a heating furnace is air atmosphere; cooling the slab to 780 ℃ after recrystallization annealing at a cooling speed of 48 ℃/s;
s2, homogenization treatment: homogenizing the plate blank cooled in the step S1, wherein the homogenizing temperature is 780 ℃, the heat preservation time is 2.5min/mm, and the heating furnace atmosphere is air atmosphere; and (4) quickly cooling the plate blank to room temperature after homogenization treatment, wherein the cooling speed is 70 ℃/s.
Taking the sample of the plate treated in the step 2, and carrying out an intercrystalline corrosion sensitivity test according to a Y method in the detection regulation of the intercrystalline corrosion sensitivity of the ferrite stainless steel in ASTM A763-1993 (R2009), wherein the result is shown in figure 1, and no intercrystalline corrosion phenomenon occurs; mechanical property tests are carried out according to the national standard GB/T228.1-2010, and the results are shown in Table 1; the average grain size was determined according to the national standard GB/T6394-2002, and the results are shown in Table 1.
Example 2
An annealing method of a high-chromium super ferrite stainless steel plate resistant to intercrystalline corrosion comprises the following steps:
s1, recrystallization annealing: carrying out recrystallization annealing on the cold-rolled high-chromium super ferrite stainless steel plate blank, wherein the recrystallization annealing temperature is 1050 ℃, the heat preservation time is 1.5min, and the atmosphere of a heating furnace is air atmosphere; cooling the plate blank to 800 ℃ after recrystallization annealing at a cooling speed of 50 ℃/s;
s2, homogenization treatment: homogenizing the plate blank cooled in the step S1, wherein the homogenizing temperature is 800 ℃, the heat preservation time is 2min/mm, and the heating furnace atmosphere is air atmosphere; and (4) quickly cooling the plate blank to room temperature after homogenization treatment, wherein the cooling speed is 70 ℃/s.
Taking the sample of the plate treated in the step 2, and carrying out an intercrystalline corrosion sensitivity test according to a Y method in the detection regulation of the intercrystalline corrosion sensitivity of the ferrite stainless steel in ASTM A763-1993 (R2009), wherein the result is shown in figure 2, and no intercrystalline corrosion phenomenon occurs; mechanical property tests are carried out according to the national standard GB/T228.1-2010, and the results are shown in Table 1; the average grain size was determined according to the national standard GB/T6394-2002, and the results are shown in Table 1.
Example 3
An annealing method of a high-chromium super ferrite stainless steel plate resistant to intercrystalline corrosion comprises the following steps:
s1, recrystallization annealing: carrying out recrystallization annealing on the cold-rolled high-chromium super ferrite stainless steel plate blank, wherein the recrystallization annealing temperature is 1060 ℃, the heat preservation time is 1min, and the atmosphere of a heating furnace is hydrogen atmosphere; cooling the slab to 830 ℃ after recrystallization annealing at a cooling speed of 45 ℃/s;
s2, homogenization treatment: homogenizing the plate blank cooled in the step S1, wherein the homogenizing temperature is 830 ℃, the heat preservation time is 1.5min/mm, and the atmosphere of a heating furnace is hydrogen atmosphere; and (4) quickly cooling the plate blank to room temperature after homogenization treatment, wherein the cooling speed is 70 ℃/s.
Taking the sample of the plate treated in the step 2, and carrying out an intercrystalline corrosion sensitivity test according to a Y method in the detection regulation of the intercrystalline corrosion sensitivity of the ASTM A763-1993 (R2009) ferritic stainless steel, wherein the result is shown in figure 3, and no intercrystalline corrosion phenomenon occurs; mechanical property tests are carried out according to the national standard GB/T228.1-2010, and the results are shown in Table 1; the average grain size was determined according to the national standard GB/T6394-2002, and the results are shown in Table 1.
Comparative example 1
And (3) carrying out 1060 ℃ recrystallization annealing on the high-chromium super ferrite stainless steel cold-rolled plate, keeping the temperature for 1min, and cooling to room temperature at the cooling rate of 50 ℃/s after the heating furnace atmosphere is an air atmosphere.
The heat-treated sample was subjected to an intergranular corrosion susceptibility test according to the Y method of the test protocol for intergranular corrosion susceptibility of ferritic stainless steel in ASTM A763-1993 (R2009), and the intergranular corrosion phenomenon occurred as shown in FIG. 4; mechanical property tests are carried out according to the national standard GB/T228.1-2010, and the results are shown in Table 1; the average grain size was determined according to the national standard GB/T6394-2002, and the results are shown in Table 1.
Comparative example 2
S1: and (3) carrying out 1040 ℃ recrystallization annealing on the high-chromium super ferrite stainless steel cold-rolled plate, keeping the temperature for 1.5min, and cooling to 900 ℃ at a cooling rate of 46 ℃/s after the heating furnace atmosphere is an air atmosphere.
S2: and (3) keeping the temperature of the fully recrystallized high-chromium super ferrite stainless steel plate at 900 ℃ for 1min, wherein the atmosphere of a heating furnace is air, and then rapidly cooling to room temperature at a cooling rate of 75 ℃/s.
Carrying out an intercrystalline corrosion sensitivity test on the sample treated in the step 2 according to a Y method in the ASTM A763-1993 (R2009) ferritic stainless steel intercrystalline corrosion sensitivity test specification, wherein the intercrystalline corrosion phenomenon occurs as shown in a test result shown in a figure 5; mechanical property tests are carried out according to the national standard GB/T228.1-2010, and the results are shown in Table 1; the average grain size was determined according to the national standard GB/T6394-2002, and the results are shown in Table 1.
Comparative example 3
S1: and (3) carrying out recrystallization annealing on the high-chromium super ferrite stainless steel cold-rolled plate at 1000 ℃, keeping the temperature for 1.5min, and cooling to 780 ℃ at the cooling rate of 45 ℃/s, wherein the heating furnace atmosphere is an air atmosphere.
S2: and (3) carrying out homogenization treatment at 780 ℃, keeping the temperature for 2.5min, and rapidly cooling the fully recrystallized high-chromium super ferrite stainless steel plate to room temperature at a cooling rate of 70 ℃/s, wherein the heating furnace atmosphere is air.
Carrying out an intercrystalline corrosion sensitivity test on the sample treated in the step 2 according to a Y method in the ASTM A763-1993 (R2009) ferritic stainless steel intercrystalline corrosion sensitivity test specification, wherein the test result is shown in figure 6, and no intercrystalline corrosion phenomenon occurs; mechanical property tests are carried out according to the national standard GB/T228.1-2010, and the results are shown in Table 1; the average grain size was determined according to the national standard GB/T6394-2002, and the results are shown in Table 1.
Remarking: and (3) intercrystalline corrosion detection: the etched sample is examined under a metallographic microscope and observed by a microscope at an enlargeable magnification of 250 to 500; in table 1, "√" indicates that no intergranular corrosion phenomenon occurs, and "×" indicates that an intergranular corrosion phenomenon occurs and a furrow-like structure (one or more crystal grains are completely surrounded by corrosion furrows) exists.
In examples 1 to 3, a cold-rolled sheet of S44660 high-chromium super-ferritic stainless steel is used, the intergranular corrosion resistance of the high-chromium super-ferritic stainless steel obtained by the treatment of the method is remarkably improved, and according to a Y method in the test protocol of inter-crystalline corrosion sensitivity of the ferritic stainless steel in ASTM a763-1993 (R2009), a boiling copper-copper sulfate-50% sulfuric acid solution test is adopted, the steel is boiled for 120 hours, and the intergranular corrosion does not cause remarkable corrosion phenomenon in the grain boundary, as shown in fig. 1 to 3. And the mechanical properties all meet the processing requirements, as shown in Table 1.
Comparative example 1 does not adopt homogenization treatment, only step 1 is adopted to meet the requirement of mechanical properties, according to the Y method in the test procedure of the sensitivity of intergranular corrosion of the ferrite stainless steel in ASTM A763-1993 (R2009), a boiling copper-copper sulfate-50% sulfuric acid solution test is adopted, boiling is carried out for 120h, all corrosion of the crystal boundary is found to be in a groove shape through metallographic examination, and intergranular corrosion obviously occurs as shown in figure 4;
if the homogenization temperature is too high as in comparative example 2, the mechanical property requirements can be met by adopting the step 1, but if the homogenization temperature is too high, chromium-rich intermetallic compounds (sigma, chi and Laves are equal) can be rapidly precipitated at the grain boundary, and the phenomenon of chromium depletion at the grain boundary can also be caused. According to the Y method in the ASTM A763-1993 (R2009) ferritic stainless steel intercrystalline corrosion sensitivity test, boiling copper-copper sulfate-50% sulfuric acid solution test is adopted, boiling is carried out for 120h, and metallographic examination shows that the grain boundary is totally corroded and is in a groove shape, crystal grains are obviously fallen off, and intercrystalline corrosion obviously occurs as shown in figure 5;
if the recrystallization temperature is too low as in comparative example 3, the recrystallization annealing at 1000 ℃ is adopted, the crystal grains are not fully recrystallized, the mechanical property requirements of subsequent processing cannot be met as shown in Table 1, and according to the Y method in the detection regulation of the intergranular corrosion sensitivity of the ASTM A763-1993 (R2009) ferrite stainless steel, a boiling copper-copper sulfate-50% sulfuric acid solution test is adopted, boiling is carried out for 120h, and the phenomenon of obvious corrosion of the grain boundary is not detected through metallographic examination.
The results of the embodiments 1-3 show that after the treatment by the method, the high-chromium super ferrite stainless steel meets the requirements of machining mechanical properties, and the intergranular corrosion resistance is obviously improved.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (2)
1. An annealing method of a high-chromium super ferrite stainless steel plate resistant to intercrystalline corrosion is characterized by comprising the following steps:
s1, recrystallization annealing: carrying out recrystallization annealing on the cold-rolled high-chromium super ferrite stainless steel plate blank, wherein the recrystallization annealing temperature is 1040-1080 ℃, the heat preservation time is 1-1.5 min/mm, and the heating furnace atmosphere is air or hydrogen atmosphere; cooling the slab to 750-830 ℃ after recrystallization annealing at a cooling speed of 45-50 ℃/s;
s2, homogenization treatment: homogenizing the plate blank cooled in the step S1, wherein the homogenizing temperature is 750-830 ℃, the heat preservation time is 1.5-2.5 min/mm, and the heating furnace atmosphere is air or hydrogen; and (3) quickly cooling the plate blank to room temperature after homogenization treatment, wherein the cooling speed is not less than 70 ℃/s.
2. The method for annealing the high-chromium super ferritic stainless steel plate with the intergranular corrosion resistance according to claim 1, characterized in that: the high-chromium super ferritic stainless steel comprises the following components in percentage by weight: c: less than or equal to 0.03 percent; si: less than or equal to 1.00 percent; mn: less than or equal to 1.00 percent; s: less than or equal to 0.03 percent; cr: 27.0-35.0%; mo: 3.0-4.0%; ni: 0 to 3.0 percent; n: less than or equal to 0.04 percent; ti + Nb: 0.20-1.0% and more than or equal to 6 (C + N); the balance being Fe and unavoidable impurities.
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| JP2015132019A (en) * | 2015-03-02 | 2015-07-23 | 新日鐵住金ステンレス株式会社 | High-purity ferritic stainless steel sheet with excellent oxidation resistance and high-temperature strength, and method for producing the same |
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| CN103276307A (en) * | 2013-04-16 | 2013-09-04 | 宝钢不锈钢有限公司 | High-corrosion resistance high-toughness high-chromium ferrite stainless steel plate and manufacturing method thereof |
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