CN118957454B - Double-phase stainless steel plate with strong corrosion resistance and small anisotropism and manufacturing method thereof - Google Patents
Double-phase stainless steel plate with strong corrosion resistance and small anisotropism and manufacturing method thereof Download PDFInfo
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- CN118957454B CN118957454B CN202411153542.2A CN202411153542A CN118957454B CN 118957454 B CN118957454 B CN 118957454B CN 202411153542 A CN202411153542 A CN 202411153542A CN 118957454 B CN118957454 B CN 118957454B
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- 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
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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Abstract
本申请涉及特殊钢材料生产技术领域，特别涉及一种耐腐蚀性强、各向异性小的双相不锈钢板及制造方法。所述耐腐蚀性强、各向异性小的双相不锈钢板包括：C：0.02~0.04%；N：0.1~0.15%；Cr：19.5~21.5%；Mn：4.0~5.0%；Cu：0.1~0.3%；Ni：1.0~1.4%；Si：0.3~0.6%，余量为Fe及不可避免微量元素；所述双向不锈钢板沿轧向和横向的屈服强度比值YSRD：YSTD的比值为1.05~1.20。本申请实施例通过提供一种耐腐蚀性强、各向异性小的双相不锈钢板及制造方法，以解决相关技术中双相不锈钢板耐腐蚀性不足、各向异性较强的问题。
The present application relates to the technical field of special steel material production, and in particular to a duplex stainless steel plate with strong corrosion resistance and low anisotropy and a manufacturing method. The duplex stainless steel plate with strong corrosion resistance and low anisotropy includes: C: 0.02~0.04%; N: 0.1~0.15%; Cr: 19.5~21.5%; Mn: 4.0~5.0%; Cu: 0.1~0.3%; Ni: 1.0~1.4%; Si: 0.3~0.6%, the remainder is Fe and unavoidable trace elements; the yield strength ratio YS RD :YS TD of the duplex stainless steel plate along the rolling direction and the transverse direction is 1.05~1.20. The embodiment of the present application solves the problem of insufficient corrosion resistance and strong anisotropy of duplex stainless steel plates in the related art by providing a duplex stainless steel plate with strong corrosion resistance and low anisotropy and a manufacturing method.
Description
Technical Field
The application relates to the technical field of special steel material production, in particular to a duplex stainless steel plate with strong corrosion resistance and small anisotropism and a manufacturing method thereof.
Background
The duplex stainless steel has the advantages of the performances of the ferrite stainless steel and the austenitic stainless steel, and the duplex stainless steel has high strength, excellent corrosion resistance and good welding performance, so that the application of the duplex stainless steel in the fields of oil and gas transportation, chemical carrier manufacturing, nuclear power and the like is also expanding continuously.
The duplex stainless steel is rich in ferrite forming elements, and is completely transformed into ferrite structures in the solidification process, and as the temperature is further reduced, austenite phases nucleate and grow in a ferrite matrix to form the duplex structures. During the subsequent hot deformation, in particular during the hot large deformation, both the austenitic phase and the ferritic phase extend and align in the rolling direction, eventually forming a lamellar dual phase structure which is very difficult to change significantly during the subsequent conventional heat treatment. Therefore, the duplex stainless steel sheet prepared by rolling and other methods generally has obvious anisotropism, for example, the plasticity such as the transverse room temperature elongation at break or the uniform elongation is obviously lower than the rolling direction, the transverse strength performance is obviously higher than the rolling direction, for example, obvious lug making defects can be generated when the duplex stainless steel sheet is stamped and formed, and moreover, the pitting corrosion resistance is a problem that the duplex stainless steel needs to be focused. Therefore, how to improve the anisotropy of duplex stainless steel sheet while improving the pitting resistance of duplex stainless steel is a technical problem to be solved in the art.
Disclosure of Invention
The embodiment of the application provides a duplex stainless steel plate with strong corrosion resistance and small anisotropism and a manufacturing method thereof, which are used for solving the problems of insufficient corrosion resistance and strong anisotropism of the duplex stainless steel plate in the related technology.
In a first aspect, there is provided a duplex stainless steel sheet having strong corrosion resistance and small anisotropy, comprising, in mass percent:
0.02-0.04% of C, 0.1-0.15% of N, 19.5-21.5% of Cr, 4.0-5.0% of Mn, 0.1-0.3% of Cu, 1.0-1.4% of Ni, 0.3-0.6% of Si, and the balance of Fe and unavoidable trace elements;
The ratio of the yield strength ratio YS RD：YSTD of the bidirectional stainless steel plate along the rolling direction to the transverse direction is 1.05-1.20.
In a second aspect, there is provided a method for manufacturing a duplex stainless steel sheet having high corrosion resistance and low anisotropy, comprising the steps of:
s1, smelting, namely putting raw materials into smelting equipment, and heating to 1500-1700 ℃ in a protective gas atmosphere to obtain a steel billet;
S2, hot rolling, namely heating the steel billet to 1100-1300 ℃ to obtain a duplex stainless steel hot rolled plate;
s3, solid solution:
S4, cold rolling, namely performing 4-5 times of cold rolling on the duplex stainless steel hot rolled steel plate subjected to the solution treatment in the S3 to obtain a cold rolled steel plate, wherein the single-time cold rolling reduction is 20-30%, and the total reduction is 70-80%;
S5, quenching in a two-phase zone:
Calculating to obtain a corresponding temperature T D when the two-phase proportion of the alpha and gamma two-phase regions is 50% by using thermodynamic calculation software, carrying out two-phase region solution treatment on the cold-rolled steel plate treated by the S4, wherein the solution temperature is T D +/-30 ℃, carrying out solution treatment for 20-60 min, and then discharging water to be cooled to below 300 ℃ to obtain the duplex stainless steel plate;
And S6, post-treatment, namely flushing the duplex stainless steel plate obtained in the step S5 by using clear water, putting the flushed duplex stainless steel plate into 50% nitric acid at the temperature of 60-80 ℃, and after keeping for 10-30 min, cleaning the duplex stainless steel plate by using clear water.
Preferably, the step S3 includes the steps of:
s301, pre-solutionizing, namely pre-solutionizing the duplex stainless steel hot rolled steel plate at 1100-1200 ℃ for 30-60 min;
s302, performing secondary solid solution, namely obtaining ferrite transformation temperature T α according to the calculation result of Thermo-Calc software;
And (3) heating the duplex stainless steel hot rolled steel plate subjected to pre-solid solution in the step S301 to (T α+T0) for solution treatment for 10min, discharging the steel plate, and cooling the steel plate to below 300 ℃ by water, wherein the value of T 0 is 10-30 ℃.
Preferably, in S4, the secondary cold rolling is performed for 5 passes.
Preferably, the cold rolling of the S4 uses a cold rolling mill, an ultrasonic vibration device is arranged on the cold rolling mill, and the ultrasonic frequency of the ultrasonic vibration device is 20-50 kHz.
Preferably, in S1, the protective gas is nitrogen or argon.
The technical scheme provided by the application has the beneficial effects that:
The embodiment of the application provides a duplex stainless steel plate with strong corrosion resistance and small anisotropism and a manufacturing method, and the mechanical property anisotropism measured along different directions of a plane of the manufactured duplex stainless steel plate is obviously weakened by improving the mass parts of raw materials of the stainless steel plate, for example, the ratio of yield strength along the rolling direction to transverse direction is 1.05-1.20, namely YS RD：YSTD is a numerical value, so that the internal anisotropism is effectively reduced, the corrosion resistance is improved, certain economic duplex stainless steel cold-rolled strips which have higher forming quality and require certain corrosion resistance to components can be met, and the requirements on the service performance are met, so that the problems of insufficient corrosion resistance and stronger anisotropism of the duplex stainless steel plate in the related art can be solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the calculation result of Thermo-Calc software provided in embodiment 1 to embodiment 2 of the present application;
FIG. 2 is a process flow diagram of a method for producing a duplex stainless steel sheet having high corrosion resistance and low anisotropy according to the present application;
FIG. 3 is a schematic drawing showing the metallographic structure, uniaxial stretching curves in the rolling direction and the transverse direction of the duplex stainless steel material manufactured in example 1 of the present application;
FIG. 4 is a schematic drawing showing the metallographic structure, uniaxial stretching curves in the rolling direction and the transverse direction of the duplex stainless steel material manufactured in example 2 of the present application;
FIG. 5 is a schematic diagram showing metallographic structure, uniaxial stretching curves in the rolling direction and the transverse direction of a duplex stainless steel material manufactured by the comparative example of the present application;
Fig. 6 is a schematic diagram of an electrokinetic potential polarization curve (voltage corresponding to a current density of 10 -4A/cm2 is critical pitting potential) obtained by testing the duplex stainless steel materials manufactured in example 1 and example 2 according to the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1 to 6, the application provides a method for manufacturing a duplex stainless steel plate with strong corrosion resistance and small anisotropism, which can solve the problems of insufficient corrosion resistance and strong anisotropism of the duplex stainless steel plate in the related art, specifically, the chemical components of the duplex stainless steel plate comprise, by mass, 0.02-0.04% of C, 0.1-0.15% of N, 19.5-21.5% of Cr, 4.0-5.0% of Mn, 0.1-0.3% of Cu, 1.0-1.4% of Ni, 0.3-0.6% of Si, and the balance of Fe and unavoidable trace elements, and the method comprises the following steps:
S1, smelting, namely putting the material into smelting equipment, and heating to 1500-1700 ℃ in a protective gas atmosphere to obtain a steel billet;
in some embodiments, the protective gas is nitrogen or argon.
S2, hot rolling, namely heating the steel billet to 1100-1300 ℃ to obtain a duplex stainless steel hot rolled plate;
s3, carrying out solid solution, namely heating the duplex stainless steel hot rolled steel plate to 1100-1200 ℃ and preserving heat for 1-2 hours at the solid solution treatment temperature;
S301, pre-solutionizing, namely pre-solutionizing the two-phase stainless steel hot rolled steel plate for 30-60 min at 1100-1200 ℃ to promote solute atoms to be solutionized in a matrix at a lower temperature and avoid overgrown grains at the same time;
S302, performing secondary solid solution, namely obtaining ferrite transformation temperature T α according to the calculation result of Thermo-Calc software, wherein the secondary solid solution is shown in FIG. 1;
And (3) heating the duplex stainless steel hot-rolled steel plate subjected to pre-solid solution in the step (S301) to (T α+T0) (namely a ferrite single-phase region) for solution treatment for 10-30 min, discharging and cooling to below 300 ℃ by water, wherein the value of T 0 is 10-30 ℃ so as to form a ferrite single-phase structure.
S4, cold rolling, namely performing 4-5 times of cold rolling on the duplex stainless steel hot rolled steel plate subjected to the solution treatment in the S3 to obtain a cold rolled steel plate, wherein the single-time cold rolling reduction is 20-30%, and the total reduction is 70-80%;
In some embodiments, the cold rolling in the step S4 uses a cold rolling mill, an ultrasonic vibration device is arranged on the cold rolling mill, the ultrasonic frequency of the ultrasonic vibration device is 20-50 kHz, and further, the ultrasonic vibration device is arranged on a roller, and when the cold rolling mill is used for cold rolling the duplex stainless steel hot rolled steel plate, the ultrasonic vibration device is synchronously started, so that the roller generates high-frequency vibration in the rolling process. The vibration is transferred to the double-phase stainless steel hot-rolled steel plate through the roller, thereby achieving the purposes of reducing friction and stress concentration, promoting plastic deformation of the material, and enabling molecules and crystal grains in the double-phase stainless steel hot-rolled steel plate to generate tiny displacement and deformation through high-frequency micro-vibration acting on the surface of the double-phase stainless steel hot-rolled steel plate, thereby improving the performance of the material.
S5, quenching in a two-phase zone:
Calculating a corresponding temperature T D when the two-phase proportion in the alpha plus gamma two-phase region is 50% by using thermodynamic calculation software, carrying out two-phase region solution treatment on the cold-rolled steel plate subjected to S4 treatment, wherein the solution temperature is T D +/-30 ℃, carrying out solution treatment for 20-60 min, and then discharging and cooling to below 300 ℃ to obtain the duplex stainless steel plate;
And S6, post-treatment, namely flushing the duplex stainless steel plate obtained in the step S5 by using clear water, putting the flushed duplex stainless steel plate into 50% nitric acid at the temperature of 60-80 ℃, and after keeping for 10-30 min, cleaning the duplex stainless steel plate by using clear water.
Example 1
Referring to fig. 2, the method for manufacturing a duplex stainless steel plate having high corrosion resistance and low anisotropy in this example includes the steps of:
S1, smelting, namely putting raw materials into smelting equipment, and heating to 1500 ℃ in a nitrogen atmosphere to obtain a steel billet;
s2, hot rolling, namely heating the steel billet to 1100 ℃ to obtain a duplex stainless steel hot rolled plate;
s3, solid solution treatment, namely, carrying out solid solution treatment on a duplex stainless steel plate with the thickness of 5 mm:
s301, pre-solutionizing, namely pre-solutionizing the double-phase stainless steel hot rolled steel plate at 1100 ℃ for 30min;
s302, performing secondary solid solution, namely obtaining ferrite transformation temperature T α which is 1295 ℃ according to the calculation result of Thermo-Calc software;
and (3) heating the duplex stainless steel hot-rolled steel plate pre-dissolved in S301 to 1305 ℃, preserving the heat for 10min, and then cooling to room temperature by water.
The dual-phase steel comprises the chemical components of 0.025% of C, 0.12% of N, 19.8% of Cr, 4.5% of Mn, 0.15% of Cu, 1.2% of Ni and 0.5% of Si.
And S4, cold rolling, namely rolling the duplex stainless steel hot rolled steel plate subjected to solution treatment in the step S3 for 4 times at room temperature by using a cold rolling mill to obtain a rolled stainless steel plate, wherein the cold rolling mill comprises a roller, a piezoelectric ceramic ultrasonic transducer fixed by a mechanical coupling device is arranged on the roller, the ultrasonic frequency of the piezoelectric ceramic ultrasonic transducer is 20kHz, the single-pass pressing amount is 20-30%, the rolling pressing amount is 70% after four passes of rolling, and the final thickness of the rolled stainless steel plate is 1.5mm.
S5, quenching in a two-phase region, namely carrying out three-time solution treatment on the stainless steel plate subjected to cold rolling in the S4, namely preserving heat at 1100 ℃ for 20min, and then discharging the stainless steel plate and cooling the stainless steel plate to below 300 ℃ by water cooling to obtain the two-phase stainless steel plate.
Specifically, the temperature T D,TD corresponding to 50% of the two-phase ratio in the α+γ two-phase region was 1080 ℃ as calculated using Thermo-Calc.
S6, post-treatment, namely washing the double-phase stainless steel plate obtained in the step S5 by using clear water, then placing the washed double-phase stainless steel plate into 50% nitric acid at 60 ℃, and after keeping for 20min, washing the double-phase stainless steel plate by using clear water.
The microstructure of the duplex stainless steel sheet produced in this example is shown in fig. 3 (a), and the uniaxial stretching curves in the Rolling Direction (RD) and the Transverse Direction (TD) are shown in fig. 3 (b).
The method used in this example substantially eliminates the original band-like structure, and in addition, the anisotropy of mechanical properties in different directions is weak, such as the ratio of yield strength in the rolling direction to that in the transverse direction, i.e., the number of YS RD：YSTD is only 1.13, as shown in fig. 6 (a), and the critical pitting potential measured by the standard method is 0.2V (vs. SCE).
Example 2
Referring to fig. 2, the method for manufacturing a duplex stainless steel plate having high corrosion resistance and low anisotropy in this example includes the steps of:
S1, smelting, namely putting raw materials into smelting equipment, and heating to 1700 ℃ in an argon atmosphere to obtain a steel billet;
S2, hot rolling, namely heating the steel billet to 1300 ℃ to obtain a duplex stainless steel hot rolled plate;
s3, solid solution treatment, namely, carrying out solid solution treatment on a duplex stainless steel plate with the thickness of 5 mm:
S301, pre-solutionizing, namely pre-solutionizing the duplex stainless steel hot rolled steel plate at 1150 ℃ for 60min;
s302, performing secondary solid solution, namely obtaining ferrite transformation temperature T α which is 1295 ℃ according to the calculation result of Thermo-Calc software;
And (3) heating the duplex stainless steel hot-rolled steel plate pre-dissolved in S301 to 1320 ℃, preserving heat for 10min, and then cooling to room temperature by water.
The dual-phase steel comprises the chemical components of 0.025% of C, 0.12% of N, 19.8% of Cr, 4.5% of Mn, 0.15% of Cu, 1.2% of Ni and 0.5% of Si. The metallographic structure is shown as a in figure 2.
And S4, cold rolling, namely rolling the duplex stainless steel hot rolled steel plate subjected to solution treatment in the step 3 for 5 times at room temperature by using a cold rolling mill to obtain a rolled stainless steel plate, wherein the cold rolling mill comprises a roller, a piezoelectric ceramic ultrasonic transducer fixed by a mechanical coupling device is arranged on the roller, the ultrasonic frequency of the piezoelectric ceramic ultrasonic transducer is 50kHz, the single-pass pressing amount is 20-30%, the total pressing amount of rolling reaches 80% after five passes of rolling, and the final thickness of the rolled stainless steel plate is 1mm.
In this embodiment, the single hold-down amounts of the cold rolling steps are not exactly equal, and the final total hold-down amount is 80%.
S5, quenching in a two-phase region, namely carrying out solution treatment in the two-phase region on the stainless steel plate subjected to cold rolling in the S4, namely preserving heat for 30min at 1080 ℃, and then discharging the stainless steel plate and cooling the stainless steel plate to 200 ℃ by water cooling to obtain the double-phase stainless steel plate.
Specifically, the temperature T D,TD corresponding to 50% of the two-phase ratio in the α+γ two-phase region was 1080 ℃ as calculated using Thermo-Calc.
S6, post-treatment, namely washing the double-phase stainless steel plate obtained in the step S5 by using clear water, then placing the washed double-phase stainless steel plate into 50% nitric acid at 80 ℃, and after the double-phase stainless steel plate is kept for 30min, washing the double-phase stainless steel plate by using clear water.
The microstructure of the duplex stainless steel sheet produced in this example is shown in fig. 4 (a), and uniaxial stretching curves in the Rolling Direction (RD) and the Transverse Direction (TD) are shown in fig. 4 (b).
The method used in this example substantially eliminates the original band-like structure, and in addition, the anisotropy of mechanical properties in different directions is weak, for example, the ratio of yield strength in the rolling direction to that in the transverse direction, i.e., the number of YS RD：YSTD is only 1.15, as shown in fig. 6 (a), and the critical pitting corrosion potential measured by the standard method is 0.19V (vs. SCE).
It should be noted that, the present application also provides other embodiments, which are different from embodiment 1 in that the heating temperature in step S1 is 1600 ℃, the heating temperature in step S2 is 1200 ℃, the pre-solution temperature of S301 is 1200 ℃, the treatment time is 40min, the temperature is raised to 1325 ℃ in S302, the solution treatment is performed for 60min in S5, the rinsed duplex stainless steel plate is placed in 50% nitric acid at 70 ℃ in S6, after the holding for 10min, the duplex stainless steel plate is cleaned with clear water, and the obtained duplex stainless steel plate is similar to the phase results of embodiment 1 and embodiment 2, and the description is omitted herein, and only the results of embodiment 1 and embodiment 2 are shown and described in the drawings.
Comparative example
The method for manufacturing the duplex stainless steel plate with strong corrosion resistance and small anisotropism in the comparative example comprises the following steps:
S1, smelting, namely putting raw materials into smelting equipment, and heating to 1700 ℃ in a nitrogen atmosphere to obtain a steel billet;
s2, hot rolling, namely heating the steel billet to 1100 ℃ to obtain a duplex stainless steel hot rolled plate;
S3, carrying out solid solution treatment on the duplex stainless steel plate with the thickness of 5mm for 30min at 1100 ℃, and then cooling to room temperature.
The dual-phase steel comprises the chemical components of 0.025% of C, 0.12% of N, 19.8% of Cr, 4.5% of Mn, 0.15% of Cu, 1.2% of Ni and 0.5% of Si.
The microstructure of the duplex stainless steel sheet produced in this comparative example is shown in fig. 5 (a), and uniaxial stretching curves in the Rolling Direction (RD) and the Transverse Direction (TD) are shown in fig. 5 (b).
The dual-phase stainless steel plate obtained in the comparative example has strong mechanical property anisotropy in different directions, and takes the ratio of yield strength in the rolling direction and the transverse direction as an example, namely YS RD：YSTD has a value of 1.9, and the critical pitting corrosion potential tested by a standard method is 0.14V (vs. SCE) as shown in FIG. 6.
In summary, the duplex stainless steel plate YS RD：YSTD produced in the comparative example was larger, that is, the difference in yield strength in both the rolling direction and the transverse direction was larger, the anisotropy was stronger, and the duplex stainless steel plate YS RD：YSTD produced in the example 1 and the example 2 was smaller, that is, the anisotropy was smaller.
The duplex stainless steel plates manufactured in the comparative examples have a lower critical pitting potential than the duplex stainless steel plates manufactured in examples 1 and 2, i.e., the duplex stainless steel plates manufactured in examples 1 and 2 have a stronger resistance to pitting corrosion, i.e., have a better corrosion resistance, and the duplex stainless steel plates manufactured in examples 1 and 2 have a stronger corrosion resistance and a smaller anisotropy.
The application also provides a duplex stainless steel plate with strong corrosion resistance and small anisotropism, which comprises the following components in percentage by mass:
0.02-0.04% of C, 0.1-0.15% of N, 19.5-21.5% of Cr, 4.0-5.0% of Mn, 0.1-0.3% of Cu, 1.0-1.4% of Ni, 0.3-0.6% of Si, and the balance of Fe and unavoidable trace elements;
The ratio of the yield strength ratio YS RD：YSTD of the bidirectional stainless steel plate along the rolling direction to the transverse direction is 1.05-1.20.
Specifically, the preparation process is described in the above examples 1 to 2.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
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| CN102719767B (en) * | 2012-06-01 | 2015-03-11 | 宝钢特钢有限公司 | Economic duplex stainless steel with excellent cold forging performance and manufacturing method thereof |
| US20180179612A1 (en) * | 2016-12-23 | 2018-06-28 | Posco | Duplex stainless steel sheet having excellent corrosion resistance and method for manufacturing the same |
| JP7266976B2 (en) * | 2018-07-27 | 2023-05-01 | 日鉄ステンレス株式会社 | Ferrite-Austenite Duplex Stainless Steel Sheet with Excellent Strength and Corrosion Resistance at Spot Welds and Manufacturing Method Thereof |
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