CN116536574A - Austenitic stainless steel with excellent low-temperature performance and preparation method thereof - Google Patents

Austenitic stainless steel with excellent low-temperature performance and preparation method thereof Download PDF

Info

Publication number
CN116536574A
CN116536574A CN202310299301.8A CN202310299301A CN116536574A CN 116536574 A CN116536574 A CN 116536574A CN 202310299301 A CN202310299301 A CN 202310299301A CN 116536574 A CN116536574 A CN 116536574A
Authority
CN
China
Prior art keywords
stainless steel
temperature
rolling
austenitic stainless
equal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310299301.8A
Other languages
Chinese (zh)
Inventor
胡昕明
欧阳鑫
王储
邢梦楠
贾春堂
刘晨希
王勇
胡海洋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Angang Steel Co Ltd
Original Assignee
Angang Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Angang Steel Co Ltd filed Critical Angang Steel Co Ltd
Priority to CN202310299301.8A priority Critical patent/CN116536574A/en
Publication of CN116536574A publication Critical patent/CN116536574A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • 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
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • 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
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • 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
    • Y02P10/20—Recycling

Abstract

The invention provides austenitic stainless steel with excellent low-temperature performance and a preparation method thereof, wherein the stainless steel comprises the following chemical components in percentage by weight: 0.04-0.08% of C, less than or equal to 1.00% of Si, 2.10-3.50% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 7.50-9.50% of Ni, 20.00-25.00% of Cr, 4.00-5.00% of Mo, 0.15-0.30% of N, 2.00-3.00% of V, and the balance of Fe and unavoidable impurities. The preparation method comprises smelting, continuous casting, forging, homogenizing, rolling and heat treatment. The austenitic stainless steel with excellent low-temperature performance has excellent low-temperature performance and high corrosion resistance.

Description

Austenitic stainless steel with excellent low-temperature performance and preparation method thereof
Technical Field
The invention relates to the technical field of steel preparation, in particular to corrosion-resistant urea-grade austenitic stainless steel with excellent low-temperature performance and a preparation method thereof, and especially relates to austenitic stainless steel with excellent low-temperature performance and a preparation method thereof.
Background
The traditional urea-grade austenitic stainless steel has the problem that the C content in the steel is required to be less than or equal to 0.03% in order to ensure that the ferrite content is low, so that the strength of the steel plate at normal temperature and low temperature is low, and the large-scale and high-pressure of urea production equipment cannot be met, which is an important development trend in the future. If the C element in the steel is greatly increased, the normal temperature and low temperature strength of the steel plate can be improved, but the corrosion resistance and low ferrite requirement of urea-grade austenitic stainless steel cannot be ensured, and the low temperature toughness is also adversely affected. In addition, the urea grade stainless steel commonly used at present is mainly 300-series austenitic stainless steel, for example, 316LMOD has good corrosion resistance, but cannot be used for manufacturing large-scale and high-pressure urea equipment due to relatively low strength. Meanwhile, the steel plate has high Ni content, so that the production cost of the steel plate is high.
The invention relates to an austenitic stainless steel with excellent ultralow temperature performance and a manufacturing method thereof (the authority number is CN 109554608B), wherein the ferrite content is less than 0.5% by controlling C to be less than or equal to 0.03% and Ni to be 11.5-12.8%, but the corrosion resistance, particularly pitting corrosion resistance, of the austenitic stainless steel is not more than 0.3% due to Mo.
The invention relates to an austenitic stainless steel plate with excellent medium-low temperature strength and a manufacturing method thereof (No. CN 101845605B), wherein C is less than or equal to 0.03%, ni is 10-13%, and normal-temperature tensile strength is 660MPa, but the austenitic stainless steel plate does not relate to yield strength at-196 ℃ and impact absorption energy at-250 ℃, and meanwhile, the intergranular corrosion performance is not mentioned.
Therefore, in order to achieve excellent low temperature performance and high corrosion resistance of urea grade austenitic stainless steel, development of corrosion resistant urea grade austenitic stainless steel having excellent low temperature performance and a method for manufacturing the same are desired.
Disclosure of Invention
According to the above technical problems, an austenitic stainless steel excellent in low temperature properties and a method for preparing the same are provided.
The invention adopts the following technical means:
an austenitic stainless steel excellent in low temperature properties, which comprises the chemical components (in weight%) as follows:
0.04-0.08% of C, less than or equal to 1.00% of Si, 2.10-3.50% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 7.50-9.50% of Ni, 20.00-25.00% of Cr, 4.00-5.00% of Mo, 0.15-0.30% of N, 2.00-3.00% of V, and the balance of Fe and unavoidable impurities.
The effect of the above chemical elements is analyzed as follows:
c is an important element of austenitic stainless steel, which can enlarge the austenite region while suppressing the formation of ferrite in the steel. In addition, the existence of the C element in the steel in the form of solid solution or carbide precipitation can also effectively improve the normal temperature and low temperature strength of the steel plate. However, too high a C content not only increases the hardness of the weld heat affected zone and post-weld heat treatment cracks, but also is detrimental to the intergranular corrosion resistance of the steel sheet. Therefore, the C content is limited to 0.04-0.08%.
Si is the main deoxidizing element of austenitic stainless steel, and can effectively reduce the oxygen content in the steel and improve the purity of the steel by improving the oxidation resistance of the steel. However, too high a Si content promotes brittle sigma phase formation or precipitation of a Si-rich G phase at grain boundaries while adversely affecting the stability of austenite. Therefore, the Si content is 1.00% or less.
Mn is an important element of austenitic stainless steel, and Mn element can enlarge an austenite region and improve the strength performance of the steel. In addition, mn is used to replace Ni to some extent in order to obtain an austenitic structure, and the addition of Mn can significantly improve the solubility of N. However, too high a Mn content may affect the weldability of the steel sheet. Therefore, the Mn content is limited to 2.10-3.50%.
Ni is an important element of austenitic stainless steel, and Ni element can inhibit ferrite formation in the steel while enlarging an austenite region. Meanwhile, the steel plate has good oxidation corrosion resistance when being matched with Cr element. Since it is expensive, the Ni content is limited to 7.50-9.50% for cost control.
Cr is an important element for oxidation resistance and corrosion resistance in austenitic stainless steel. To ensure excellent corrosion resistance of stainless steel, grain boundaries are prevented from being due to M 23 C 6 The precipitation of carbide causes a chromium-poor zone near the grain boundary, and the increase of Cr content is beneficial to improving the solubility of N in steel, but excessive addition of the carbide causes coarsening of the carbide, thereby reducing the strength and toughness of the steel plate. Thus, the Cr content is limited to 25.00-30.00%.
Mo is an important element in austenitic stainless steel for improving high temperature strength and corrosion resistance, and in addition, it has a strong affinity for P, it can reduce the amount of segregated P at grain boundaries, and is advantageous for the reduction of weld heat treatment cracking sensitivity. Therefore, the Mo content is limited to 4.00-5.00%.
N is a strong austenite forming and stabilizing element, and can also replace part of Ni element in austenitic heat-resistant steel to form a more stable austenite structure. The low-temperature strength of the steel plate is obviously improved, and the ductility of the steel plate is not damaged. Therefore, the N content is limited to 0.15-0.30%.
The main function of V in steel is to form carbide and nitride with C, N preferentially, so that chromium carbide and chromium nitride are prevented from precipitating and generating a 'chromium-poor zone' near a crystal boundary, and the intergranular corrosion of the steel plate is increased. Thus, the V content is limited to 2.00-3.00%.
P, S is a detrimental element of austenitic stainless steel, theoretically the lower the content, the better, but excessive reduction will lead to a significant increase in manufacturing costs. Therefore, the P content is limited to 0.020% or less and the S content is limited to 0.010% or less.
The invention also discloses a preparation method of the austenitic stainless steel with excellent low-temperature performance, which comprises the following steps: smelting, continuous casting, forging, homogenizing rolling, solution treatment and stabilization treatment, wherein the specific method comprises the following steps:
(1) Smelting: stainless steel smelting is carried out by adopting an electric furnace smelting method, an AOD (argon oxygen decarburization) and a VOD steelmaking method.
(2) Continuous casting: the pouring temperature of the molten steel in the tundish is 1570-1590 ℃, the superheat degree of the continuous casting billet is 60-80 ℃, and the pulling speed of the continuous casting billet is 1.0-1.3m/min; the rolling reduction of the continuous casting billet under light rolling is 5-8mm, and the rolling reduction rate is 0.6-1.2mm/m.
(3) Forging: the heating temperature is 1220-1250 ℃, the heat preservation is carried out for 5-10 hours, the deformation of each forging pass is controlled to be 20-30mm, and the deformation is accumulated for 4-5 passes until the forging process is completed.
(4) Homogenizing: heating to 1240-1260 ℃, carrying out net heat preservation for 80-100h, and then carrying out the last forging after the heat preservation is finished, wherein the deformation is 10-15mm, so as to ensure that the prior austenite structure is relatively fine before rolling.
(5) Rolling: the adding temperature of the continuous casting billet is 1200-1230 ℃; adopting two-stage rolling, wherein the initial rolling temperature of rough rolling is more than or equal to 1130 ℃, the final rolling temperature is more than or equal to 1000 ℃, the rolling passes in the stage are 4-6 times, the roller speed is controlled to be 40-60r/min, and the first pass reduction rate is more than or equal to 20%; the initial rolling temperature is more than or equal to 950 ℃ and the final rolling temperature is more than or equal to 850 ℃ in the finish rolling stage, the single pass rolling reduction is 8-10%, the rolling pass is 5-7 times in the stage, and the roller speed is controlled to be 20-25r/min.
(6) And (3) heat treatment: the solution heat treatment temperature is 980-1100 ℃, the net heat preservation time is 10-60mm, and the solution is cooled to room temperature after being discharged from the furnace.
The nitrogen-containing urea-grade austenitic stainless steel manufactured by the components and the process has the width of 2000-5000mm and the thickness of 10-35mm, and has the yield strength of more than or equal to 380MPa, the tensile strength of more than or equal to 710MPa and the elongation of more than or equal to 50 percent at room temperature; the yield strength at the temperature of minus 196 ℃ is more than or equal to 750MPa, and the impact absorption energy at the temperature of minus 250 ℃ is more than or equal to 150J; ferrite content less than 0.1%, grain size 4-6 grade; after the sensitization treatment at 650 ℃ and 2 hours, the method meets the requirement of GB/T4334-2018 method E of intergranular corrosion test method for corrosion stainless steel of metals and alloys, and simultaneously meets the requirement of average corrosion rate less than or equal to 3.0 mu m/48 hours in five corrosion periods according to the requirement of ASTMA262 standard method C for detecting intergranular corrosion sensitivity of austenitic stainless steel.
According to the invention, a large amount of C, N elements are added, so that the normal-temperature and low-temperature strength of the steel plate is improved, the Ni content of the noble metal element in the steel is reduced, and the manufacturing cost of the steel plate is greatly reduced; by increasing the Cr and Mo contents in the steel, the corrosion resistance of the steel plate is improved, and the increase of the Cr content is also beneficial to improving the solubility of N in the steel. In addition, the addition of the V element avoids the occurrence of a 'chromium-deficient zone' near a grain boundary, and further improves the corrosion resistance of the steel plate.
For the reasons, the invention can be widely popularized in the fields of high corrosion-resistant urea-grade austenitic stainless steel with excellent low-temperature performance and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a photograph of ferrite in an austenitic stainless steel excellent in low-temperature properties according to an embodiment of the present invention.
FIG. 2 is a photograph showing grain size of an austenitic stainless steel excellent in low temperature properties according to an embodiment of the present invention.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The described embodiments are only some, but not all, embodiments of the invention. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
An austenitic stainless steel excellent in low temperature properties, which comprises the chemical components (in weight%) as follows:
0.04-0.08% of C, less than or equal to 1.00% of Si, 2.10-3.50% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 7.50-9.50% of Ni, 20.00-25.00% of Cr, 4.00-5.00% of Mo, 0.15-0.30% of N, 2.00-3.00% of V, and the balance of Fe and unavoidable impurities.
The preparation method comprises the following steps:
(1) Smelting: stainless steel smelting is carried out by adopting an electric furnace smelting method, an AOD (argon oxygen decarburization) and a VOD steelmaking method.
(2) Continuous casting: the pouring temperature of the molten steel in the tundish is 1570-1590 ℃, the superheat degree of the continuous casting billet is 60-80 ℃, and the pulling speed of the continuous casting billet is 1.0-1.3m/min; the rolling reduction of the continuous casting billet under light rolling is 5-8mm, and the rolling reduction rate is 0.6-1.2mm/m.
(3) Forging: the heating temperature is 1220-1250 ℃, the heat preservation is carried out for 5-10 hours, the deformation of each forging pass is controlled to be 20-30mm, and the deformation is accumulated for 4-5 passes until the forging process is completed.
(4) Homogenizing: heating to 1240-1260 ℃, carrying out net heat preservation for 80-100h, and then carrying out the last forging after the heat preservation is finished, wherein the deformation is 10-15mm, so as to ensure that the prior austenite structure is relatively fine before rolling.
(5) Rolling: the adding temperature of the continuous casting billet is 1200-1230 ℃; adopting two-stage rolling, wherein the initial rolling temperature of rough rolling is more than or equal to 1130 ℃, the final rolling temperature is more than or equal to 1000 ℃, the rolling passes in the stage are 4-6 times, the roller speed is controlled to be 40-60r/min, and the first pass reduction rate is more than or equal to 20%; the initial rolling temperature is more than or equal to 950 ℃ and the final rolling temperature is more than or equal to 850 ℃ in the finish rolling stage, the single pass rolling reduction is 8-10%, the rolling pass is 5-7 times in the stage, and the roller speed is controlled to be 20-25r/min.
(6) And (3) heat treatment: the solution heat treatment temperature is 980-1100 ℃, the net heat preservation time is 10-60mm, and the solution is cooled to room temperature after being discharged from the furnace.
The following describes the invention in more detail with reference to 10 examples. The chemical compositions of 10 examples are shown in table 1;
table 1 example chemical composition (wt%)
Examples C Si Mn Cr Ni N V Mo
1 0.044 0.11 3.21 21.84 7.64 0.23 2.97 4.38
2 0.067 0.21 2.13 20.19 7.77 0.34 2.62 4.77
3 0.078 0.35 3.21 22.86 8.51 0.26 2.23 4.98
4 0.065 0.47 3.13 21.83 8.64 0.34 2.46 4.14
5 0.059 0.52 3.08 23.74 8.26 0.25 2.32 4.06
6 0.057 0.68 2.79 23.83 9.31 0.35 2.56 4.61
7 0.056 0.72 3.42 24.29 9.16 0.38 2.73 4.31
8 0.064 0.85 2.19 23.74 8.43 0.27 2.84 4.35
9 0.041 0.95 2.13 20.11 7.53 0.15 2.01 4.02
10 0.079 0.93 3.48 24.98 9.47 0.30 2.99 4.98
The smelting and continuous casting processes of 10 examples are shown in Table 2;
table 2 example smelting and continuous casting process
Examples Molten steel temperature DEG C Degree of superheat Pulling speed m/min Reduction in mm Reduction percentage%
1 1576 78 1.1 6.7 1.14
2 1583 72 1.2 7.9 1.03
3 1575 66 1.2 5.9 0.83
4 1586 67 1.0 7.3 0.98
5 1584 74 1.2 6.4 1.19
6 1576 77 1.2 6.5 0.66
7 1580 60 1.1 7.6 1.05
8 1577 65 1.3 5.3 0.76
9 1570 60 1.0 5.0 0.61
10 1590 80 1.3 8.0 1.20
The forging and homogenization processes for 10 examples are shown in table 3;
table 3 example forging and homogenizing process
The rolling process of 10 examples is shown in table 4;
table 4 example rolling process
The heat treatment process for 10 examples is shown in table 5;
table 5 example heat treatment process
Examples Temperature (DEG C) Clean incubation time min
1 991 14
2 1067 47
3 999 37
4 1070 26
5 1090 56
6 1033 13
7 1088 35
8 1018 46
9 980 10
10 1100 60
The performance parameters of an austenitic stainless steel with excellent low-temperature performance prepared according to the above components and the preparation process are shown in table 6;
table 6 example overall performance
Note that: the steel plates of examples 1-10 meet the requirements of GB/T4334-2018 method E of intergranular corrosion test method for corrosion stainless steel of metals and alloys after being sensitized at 650 ℃ for 3 hours.
As is clear from Table 6, the austenitic stainless steel excellent in low-temperature performance provided by the present invention has excellent corrosion resistance and excellent low-temperature performance while reducing the manufacturing cost.
As shown in fig. 1, the residual ferrite content in the stainless steel was 0.02%, and as shown in fig. 2, the grain size in the stainless steel was 4.5 grade.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (10)

1. An austenitic stainless steel with excellent low-temperature performance is characterized by comprising the following chemical components in percentage by weight:
0.04-0.08% of C, less than or equal to 1.00% of Si, 2.10-3.50% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 7.50-9.50% of Ni, 20.00-25.00% of Cr, 4.00-5.00% of Mo, 0.15-0.30% of N, 2.00-3.00% of V, and the balance of Fe and unavoidable impurities.
2. The austenitic stainless steel excellent in low-temperature properties according to claim 1, wherein the stainless steel has a width of 2000-5000mm and a thickness of 10-35mm.
3. The austenitic stainless steel excellent in low-temperature properties according to claim 1, wherein the yield strength at room temperature of the stainless steel is not less than 380MPa, the tensile strength is not less than 710MPa, and the elongation is not less than 50%.
4. The austenitic stainless steel excellent in low-temperature properties according to claim 1, wherein the yield strength of the stainless steel is not less than 750MPa at-196 ℃ and the impact absorption energy is not less than 150J at-250 ℃.
5. The austenitic stainless steel excellent in low-temperature properties according to claim 1, wherein the ferrite content in the stainless steel is < 0.1%, and the grain size of the stainless steel is 4-6 grade.
6. The austenitic stainless steel with excellent low-temperature performance according to claim 1, wherein the stainless steel meets the requirements of GB/T4334-2018 method for intergranular corrosion test of Corrosion stainless steel of metals and alloys after being sensitized at 650 ℃ for 2 hours, and meets the requirements of the method C for detecting intergranular corrosion sensitivity of austenitic stainless steel according to ASTMA262, wherein the average corrosion rate in five corrosion cycles is less than or equal to 3.0 mu m/48 hours.
7. The method for producing austenitic stainless steel excellent in low-temperature properties according to any one of claims 1 to 6, comprising the steps of:
(1) Smelting:
smelting according to the composition of claim 1 to obtain molten steel;
(2) Continuous casting;
(3) Forging;
(4) Homogenizing:
heating to 1240-1260 ℃, carrying out net heat preservation for 80-100h, and forging for the last time after heat preservation is finished, wherein the deformation is 10-15mm, so that a relatively fine original austenite structure is ensured before rolling;
(5) Rolling:
the adding temperature of the continuous casting billet is 1200-1230 ℃; adopting two-stage rolling, wherein the initial rolling temperature of rough rolling is more than or equal to 1130 ℃, the final rolling temperature is more than or equal to 1000 ℃, the rolling passes in the stage are 4-6 times, the roller speed is controlled to be 40-60r/min, and the first pass reduction rate is more than or equal to 20%; the initial rolling temperature is more than or equal to 950 ℃ in the finish rolling stage, the final rolling temperature is more than or equal to 850 ℃, the single pass rolling reduction is 8-10%, the rolling passes in the stage are 5-7 times, and the roller speed is controlled to be 20-25r/min;
(6) And heat treating to obtain the stainless steel.
8. The method for producing austenitic stainless steel excellent in low temperature properties according to claim 7, wherein in said step (2), the specific process of continuous casting is as follows: the pouring temperature of the molten steel in the tundish is 1570-1590 ℃, the superheat degree of the continuous casting billet is 60-80 ℃, and the pulling speed of the continuous casting billet is 1.0-1.3m/min; the rolling reduction of the continuous casting billet under light rolling is 5-8mm, and the rolling reduction rate is 0.6-1.2mm/m.
9. The method for producing austenitic stainless steel excellent in low temperature properties according to claim 7, wherein in said step (3), the specific process of forging is as follows: heating at 1220-1250 ℃, preserving heat for 5-10h, controlling the deformation of each forging pass to be 20-30mm, and carrying out deformation accumulation for 4-5 passes.
10. The method for producing austenitic stainless steel excellent in low-temperature properties according to claim 7, wherein in said step (6), the heat treatment is solution heat treatment, comprising the steps of: the solution heat treatment temperature is 980-1100 ℃, the net heat preservation time is 10-60mm, and the solution is cooled to room temperature after being discharged from the furnace.
CN202310299301.8A 2023-03-24 2023-03-24 Austenitic stainless steel with excellent low-temperature performance and preparation method thereof Pending CN116536574A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310299301.8A CN116536574A (en) 2023-03-24 2023-03-24 Austenitic stainless steel with excellent low-temperature performance and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310299301.8A CN116536574A (en) 2023-03-24 2023-03-24 Austenitic stainless steel with excellent low-temperature performance and preparation method thereof

Publications (1)

Publication Number Publication Date
CN116536574A true CN116536574A (en) 2023-08-04

Family

ID=87449518

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310299301.8A Pending CN116536574A (en) 2023-03-24 2023-03-24 Austenitic stainless steel with excellent low-temperature performance and preparation method thereof

Country Status (1)

Country Link
CN (1) CN116536574A (en)

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101724789A (en) * 2008-10-23 2010-06-09 宝山钢铁股份有限公司 Austenitic stainless steel medium-thick plate and manufacture method thereof
CN102168230A (en) * 2011-04-14 2011-08-31 北京科技大学 304 substituting nickel-saving austenitic stainless steel and preparation method thereof
CN102816978A (en) * 2012-06-20 2012-12-12 宝钢不锈钢有限公司 High-strength austenitic stainless steel hot rolling sheet with delicate surface and manufacturing method thereof
CN103966528A (en) * 2014-04-29 2014-08-06 宝钢不锈钢有限公司 Austenitic stainless steel containing Sn and manufacturing method thereof
CN105121689A (en) * 2013-03-13 2015-12-02 阿海珐核能公司 Stainless steel for hot forging, and hot forging method using said steel
CN106256920A (en) * 2015-06-17 2016-12-28 宝钢不锈钢有限公司 A kind of titanium-containing austenitic stainless steel with good oxidation resistance energy and manufacture method thereof
CN108138280A (en) * 2015-09-30 2018-06-08 新日铁住金株式会社 The manufacturing method of austenite stainless steel and austenite stainless steel
CN111373067A (en) * 2017-12-06 2020-07-03 株式会社Posco Nonmagnetic austenitic stainless steel having excellent corrosion resistance and method for manufacturing same
CN112877611A (en) * 2019-11-29 2021-06-01 宝武特种冶金有限公司 Austenitic stainless steel, fine-grain large-size bar and preparation method and application thereof
CN113015817A (en) * 2018-11-12 2021-06-22 株式会社Posco Nonmagnetic austenitic stainless steel and method for producing same
CN113564462A (en) * 2021-06-29 2021-10-29 鞍钢股份有限公司 High-carbon austenitic stainless steel plate with uniform intergranular corrosion resistant structure and manufacturing method thereof
CN113564461A (en) * 2021-06-29 2021-10-29 鞍钢股份有限公司 Austenitic stainless steel plate for fast neutron reactor and manufacturing method thereof
CN114250421A (en) * 2021-12-31 2022-03-29 福建青拓特钢技术研究有限公司 High-nitrogen austenitic stainless steel with resistance to intergranular corrosion and pitting corrosion after welding superior to 316L and manufacturing method thereof
CN114318137A (en) * 2021-06-29 2022-04-12 鞍钢股份有限公司 Austenitic stainless steel plate for nuclear power and manufacturing method thereof
CN115558852A (en) * 2022-09-23 2023-01-03 福建青拓特钢技术研究有限公司 High-strength austenitic stainless steel with crevice corrosion resistance and pitting corrosion resistance superior to 317L and manufacturing method thereof

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101724789A (en) * 2008-10-23 2010-06-09 宝山钢铁股份有限公司 Austenitic stainless steel medium-thick plate and manufacture method thereof
CN102168230A (en) * 2011-04-14 2011-08-31 北京科技大学 304 substituting nickel-saving austenitic stainless steel and preparation method thereof
CN102816978A (en) * 2012-06-20 2012-12-12 宝钢不锈钢有限公司 High-strength austenitic stainless steel hot rolling sheet with delicate surface and manufacturing method thereof
CN105121689A (en) * 2013-03-13 2015-12-02 阿海珐核能公司 Stainless steel for hot forging, and hot forging method using said steel
CN103966528A (en) * 2014-04-29 2014-08-06 宝钢不锈钢有限公司 Austenitic stainless steel containing Sn and manufacturing method thereof
CN106256920A (en) * 2015-06-17 2016-12-28 宝钢不锈钢有限公司 A kind of titanium-containing austenitic stainless steel with good oxidation resistance energy and manufacture method thereof
CN108138280A (en) * 2015-09-30 2018-06-08 新日铁住金株式会社 The manufacturing method of austenite stainless steel and austenite stainless steel
CN111373067A (en) * 2017-12-06 2020-07-03 株式会社Posco Nonmagnetic austenitic stainless steel having excellent corrosion resistance and method for manufacturing same
CN113015817A (en) * 2018-11-12 2021-06-22 株式会社Posco Nonmagnetic austenitic stainless steel and method for producing same
CN112877611A (en) * 2019-11-29 2021-06-01 宝武特种冶金有限公司 Austenitic stainless steel, fine-grain large-size bar and preparation method and application thereof
CN113564462A (en) * 2021-06-29 2021-10-29 鞍钢股份有限公司 High-carbon austenitic stainless steel plate with uniform intergranular corrosion resistant structure and manufacturing method thereof
CN113564461A (en) * 2021-06-29 2021-10-29 鞍钢股份有限公司 Austenitic stainless steel plate for fast neutron reactor and manufacturing method thereof
CN114318137A (en) * 2021-06-29 2022-04-12 鞍钢股份有限公司 Austenitic stainless steel plate for nuclear power and manufacturing method thereof
CN114250421A (en) * 2021-12-31 2022-03-29 福建青拓特钢技术研究有限公司 High-nitrogen austenitic stainless steel with resistance to intergranular corrosion and pitting corrosion after welding superior to 316L and manufacturing method thereof
CN115558852A (en) * 2022-09-23 2023-01-03 福建青拓特钢技术研究有限公司 High-strength austenitic stainless steel with crevice corrosion resistance and pitting corrosion resistance superior to 317L and manufacturing method thereof

Similar Documents

Publication Publication Date Title
CN101781742B (en) Medium-thickness ship plate steel with ultrahigh intensity and low-temperature impact toughness and manufacturing method thereof
CN110607479B (en) Stainless steel for valve spring and preparation method of steel wire of stainless steel
CN109207846A (en) A kind of high anti-corrosion section nickel high-nitrogen austenitic stainless steel
CN110373607B (en) High-temperature carburized steel, high-temperature carburized steel component and preparation method thereof
JP2007031733A (en) STEEL HAVING EXCELLENT DELAYED FRACTURE RESISTANCE AND TENSILE STRENGTH IN CLASS OF &gt;=1,600 MPa, AND METHOD FOR PRODUCING FORMING THEREOF
CN113549820B (en) High-carbon low-ferrite-content austenitic stainless steel plate and production method thereof
CN111826589A (en) Plastic die steel with high strength and high corrosion resistance and preparation method thereof
CN112251670A (en) 690 MPa-grade steel plate with good extensibility and manufacturing method thereof
CN114672723A (en) 46MnVS series steel for expansion-fracture connecting rod and manufacturing method thereof
CN110184530B (en) Normalized steel sheet for pipe used under low temperature and acidic conditions and method for producing same
JP3483493B2 (en) Cast steel for pressure vessel and method of manufacturing pressure vessel using the same
CN111004978B (en) Low-alloy high-temperature-resistant pressure vessel steel plate and production method thereof
CN102251086B (en) Molybdenum-based ferrite stainless steel and preparation method thereof
CN110791706A (en) Austenitic coarse-grain structural steel for cold forging and preparation method of wire rod of austenitic coarse-grain structural steel
CN110983197A (en) 800MPa grade high cold-bending cold-rolling dual-phase steel plate and preparation method thereof
CN114318137B (en) Austenitic stainless steel plate for nuclear power and manufacturing method thereof
CN113957361B (en) Austenitic heat-resistant steel plate for petrochemical equipment and manufacturing method thereof
CN115558852A (en) High-strength austenitic stainless steel with crevice corrosion resistance and pitting corrosion resistance superior to 317L and manufacturing method thereof
CN111996462B (en) Longitudinal variable-thickness ultrahigh-strength ship board and production method thereof
CN116536574A (en) Austenitic stainless steel with excellent low-temperature performance and preparation method thereof
CN111057964B (en) Steel for high-strength knuckle of new energy automobile and preparation method and application thereof
CN114045384A (en) Method for improving low-temperature impact toughness of low-nickel ferrite-austenite stainless steel
CN110373615B (en) Economical fine-grain austenitic stainless steel and manufacturing method thereof
JP2021038439A (en) Ferritic stainless steel bar, automobile fuel system component and automobile fuel system member
CN116377322A (en) Nitrogen-containing urea-grade austenitic stainless steel and preparation method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination