CN109136771A - austenitic stainless steel and preparation method thereof - Google Patents
austenitic stainless steel and preparation method thereof Download PDFInfo
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- CN109136771A CN109136771A CN201811220143.8A CN201811220143A CN109136771A CN 109136771 A CN109136771 A CN 109136771A CN 201811220143 A CN201811220143 A CN 201811220143A CN 109136771 A CN109136771 A CN 109136771A
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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
- 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
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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
- 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
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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
- 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
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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
- C22C38/001—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
- C22C38/04—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
- 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
- C22C38/58—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
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Abstract
The present invention relates to austenitic stainless steel material fields more particularly to a kind of austenitic stainless steel and preparation method thereof.The austenitic stainless steel, by weight percentage, including C 0.04-0.08%, Si 0.5-1.5%, Mn 1.0-3.0%, Cr 16-18%, Ni 8-10%, Nb 0.50-1.00%, N 0.02-0.06%, P≤0.025%, S≤0.010%, (0.5 × Nb)/(30 × C+50 × N)≤0.12, surplus are Fe and inevitable impurity.The preparation method of the austenitic stainless steel, comprising the following steps: (1) smelt continuous casting billet；(2) continuous casting billet is heated to 1250-1300 DEG C, keeps the temperature 90-150 minutes；(3) hot rolling is carried out to the continuous casting billet and obtains hot rolled plate；(4) hot rolled plate is heated to 1100-1200 DEG C, keeps the temperature 60-90 minutes；(5) it quenches.Austenitic stainless steel of the invention can long service under the high temperature conditions, 400-600 DEG C of high temperature yield and tensile strength are high, fully meet the requirement of solar energy thermo-power station fused salt storage tank.
Description
Technical field
The present invention relates to austenitic stainless steel material fields more particularly to a kind of austenitic stainless steel and preparation method thereof.
Background technique
Solar energy thermo-power station collects solar thermal energy using large scale array mirror surface, provides steam, knot by heat-exchanger rig
It closes traditional steam turbine generator and reaches power generation purpose.Using solar light-heat power-generation, expensive silicon wafer photoelectric conversion technique is avoided,
The cost of solar power generation can be substantially reduced, while can also be achieved 24 hours and uninterruptedly generating electricity by way of merging two or more grid systems, is that the whole world is closed extensively
The important clean energy resource of note.
The solar thermal energy that photo-thermal power station is collected need to be stored in salt storage tank, therefore comprehensive to the material of manufacture storage tank
Performance requirement is harsh: need to have good high-temperature yield strength and Testing Tensile Strength at Elevated Temperature at 400-600 DEG C；Resistance to intergranular corrosion
It can be excellent；Grain size grading needs≤7；Ferrite content should be less than 8%.
Although traditional austenitic stainless steel material 304L, 316L etc. can satisfy storage tank to material corrosion resistance and microcosmic
The requirement of tissue, but high temperature yield at its 400-600 DEG C and tensile strength is not generally high；Although the iron nickel base alloys such as 800H are high
Warm function admirable, but due in component system alloy content it is higher, cost performance be unable to satisfy photo-thermal power station requirement.
It can be seen that a kind of austenitic stainless steel material specifically for solar energy thermo-power station need to be developed, pass through
Optimizing components and preparation process amelioration further increase material and exist while guaranteeing that corrosion resistance and microstructure require
High temperature yield and tensile strength at 400-600 DEG C fully meet solar energy thermo-power station salt storage tank to material to reach
Expect the requirement of comprehensive performance.
Summary of the invention
The purpose of the present invention is in view of the drawbacks of the prior art, provide it is a kind of at 400-600 DEG C have excellent height
Warm intensity and corrosion resistance and the good austenitic stainless steel of Microstructure Performance and preparation method thereof.
On the one hand, the present invention provides a kind of austenitic stainless steels, by weight percentage, including C0.04-0.08%,
Si 0.5-1.5%, Mn 1.0-3.0%, Cr 16-18%, Ni 8-10%, Nb 0.50-1.00%, N 0.02-0.06%, P
≤ 0.025%, S≤0.010%, (0.5 × Nb)/(30 × C+50 × N)≤0.12, surplus are Fe and inevitable impurity.
Above-mentioned austenitic stainless steel, by weight percentage, including C 0.04-0.06%, Si 0.5-1.0%, Mn
1.0-1.5%, Cr 17-17.5%, Ni 9-9.5%, Nb 0.60-0.80%, N 0.02-0.04%, P≤0.025%, S≤
0.010%, (0.5 × Nb)/(30 × C+50 × N)≤0.11, surplus are Fe and inevitable impurity.
On the other hand, the present invention provides a kind of preparation methods of austenitic stainless steel, comprising the following steps:
(1) continuous casting billet is smelted；
(2) continuous casting billet is heated to 1250-1300 DEG C, keeps the temperature 90-150 minutes；
(3) hot rolling is carried out to the continuous casting billet and obtains hot rolled plate, wherein broadening pass deformation rate 10-15%, axial rolling passage
Deformation rate 20-40%, 1050-1150 DEG C of finishing temperature；
(4) hot rolled plate is heated to 1100-1200 DEG C, keeps the temperature 60-90 minutes；
(5) it quenches.
The continuous casting billet in the step (2), is heated to 1250- by the preparation method of above-mentioned austenitic stainless steel
1280 DEG C, keep the temperature 100-150 minutes.
The preparation method of above-mentioned austenitic stainless steel in the step (3), carries out hot rolling to the continuous casting billet and obtains heat
Roll plate, wherein broadening pass deformation rate 10-15%, axial rolling pass deformation rate 25-30%, 1050-1100 DEG C of finishing temperature.
The hot rolled plate in the step (4), is heated to 1100- by the preparation method of above-mentioned austenitic stainless steel
1180 DEG C, keep the temperature 60-90 minutes.
The preparation method of above-mentioned austenitic stainless steel in the step (1), is smelted using Ar-O_2 furnace and ladle refining furnace
Continuous casting billet.
The preparation method of above-mentioned austenitic stainless steel, in the step (2), using continuous-type furnace to the continuous casting
Base is heated.
The preparation method of above-mentioned austenitic stainless steel, in the step (3), the hot rolling is multistage hot deformation.
The preparation method of above-mentioned austenitic stainless steel in the step (4), carries out the hot rolled plate using normalizing furnace
Heating.
Technical solution of the present invention have it is following the utility model has the advantages that
(1) carbon containing high level, nitrogen in austenitic stainless steel of the invention, while adding the micro- of high level
Alloy strengthening element (niobium), and the matching of niobium and carbon, nitrogen content is rationally designed, not only remain the anti-corrosion of stainless steel
Performance also improves its mechanical performance and welding performance；
(2) preparation method of austenitic stainless steel of the invention, after targetedly hot-working and solid solution treatment process,
The excellent feature of traditional corrosion resistance of austenitic stainless steels is not only maintained, ferrite content and grain size are also very beneficial for material
Long service under the high temperature conditions, while 400-600 DEG C of high temperature yield and tensile strength are obviously improved, and the sun is fully met
The requirement of energy photo-thermal power station fused salt storage tank, has further expanded application field of the austenitic stainless steel in photo-thermal power station.
Detailed description of the invention
Fig. 1 is the microstructure photo for the austenitic stainless steel that embodiment 1 produces.
Specific embodiment
In order to fully understand the purpose of the present invention, feature and effect, by following specific embodiments, the present invention is made detailed
It describes in detail bright.For process of the invention in addition to following the description, remaining is all made of the conventional method or device of this field.Following nouns
Term is unless otherwise stated, all have the normally understood meaning of those skilled in the art.
Specifically, the invention discloses a kind of austenitic stainless steels, by weight percentage, including C 0.04-0.08%,
Si 0.5-1.5%, Mn 1.0-3.0%, Cr 16-18%, Ni 8-10%, Nb 0.50-1.00%, N 0.02-0.06%, P
≤ 0.025%, S≤0.010%, (0.5 × Nb)/(30 × C+50 × N)≤0.12, surplus are Fe and inevitable impurity；
Including C 0.04-0.06%, Si 0.5-1.0%, Mn 1.0-1.5%, Cr 17- preferably, by weight percentage,
17.5%, Ni 9-9.5%, Nb 0.60-0.80%, N 0.02-0.04%, P≤0.025%, S≤0.010%, (0.5 ×
Nb)/(30 × C+50 × N)≤0.11, surplus are Fe and inevitable impurity.
The work of main chemical compositions of the invention is used as narration in detail below:
Carbon is important austenizer, can reduce the ferrite content in austenitic stainless steel；Meanwhile carbon can also be shown
The mechanical behavior under high temperature for improving austenitic stainless steel is write, but content can excessively seriously affect the corrosion resistance and weldability of material, because
This carbon content should control between 0.04-0.08 (wt) %, preferably 0.04-0.06 (wt) %.
Seemingly, the mechanical behavior under high temperature of austenitic stainless steel can be improved, but as ferrite former, contain in silicon and carbons
Amount is not easy excessively, therefore silicone content should control between 0.5-1.5 (wt) %, preferably 0.5-1.0 (wt) %.
Manganese is a kind of austenizer, is remarkably improved solubility of the nitrogen in austenitic stainless steel, but content
Excessively field trash is easy to cause to increase, therefore manganese content should control between 1.0-3.0 (wt) %, preferably 1.0-1.5
(wt) %.
Chromium is main corrosion resistance element in austenitic stainless steel, and similar with manganese, the chromium being solid-solution in steel can be mentioned significantly
High nitrogen-containing.But since chromium is main ferrite former, content excessively will lead to ferrite content increase, therefore
Chromium content should control between 16-18 (wt) %, preferably 17-17.5 (wt) %.
Nickel is strong stable austenite and the element for expanding austenite phase field, but nickel content can excessively reduce carbon in Austria
Solubility in family name's body stainless steel, enhancing Carbide Precipitation tendency, therefore nickel content should control between 8-10%, preferably 9-
9.5 (wt) %.
Niobium is important dispersion-strengtherning and solution strengthening element, can be obviously improved the high-temperature mechanics of austenitic stainless steel
Energy；Niobium can be effectively improved the intergranular corrosion resistance performance of austenitic stainless steel, niobium contains by generating niobium carbonitrides in conjunction with carbon, nitrogen
Amount should control between 0.50-1.00 (wt) %, preferably 0.60-0.80 (wt) %.
Nitrogen is a kind of austenizer for being capable of forming, stablizing and expanding austenite phase field, can increase substantially Austria
The intensity of family name's body stainless steel, while reducing the ferrite content in austenitic stainless steel.To ensure that nitrogen is solid-solution in austenite stainless
In the lattice of steel, nitrogen content should be controlled between 0.02-0.06 (wt) %, preferably 0.02-0.04 (wt) %.
Phosphorus, sulphur are the harmful elements in stainless steel, and the lower content the better, should be controlled respectively in 0.025 (wt) % and 0.010
(wt) % or less.
In order to further ensure that the elevated temperature strength and intergranular corrosion resistance performance of material, (0.5 × Nb) and (30 × C+50 × N)
Ratio should control 0.12 hereinafter, preferably 0.11 or less.
The above selection of each chemical component and its determination of content, are that inventor is obtained by creative work.Respectively
Chemical component makes austenitic stainless steel of the invention have excellent corrosion resistance, excellent high temperature strong by playing synergistic effect
Degree, good mechanical performance and welding performance, fully meet the requirement of solar energy thermo-power station fused salt storage tank.
In austenitic stainless steel of the invention, carbon, nitrogen content are relatively high, and add the V-N steel of high level
Element (niobium), while the matching of niobium and carbon, nitrogen content is rationally designed, therefore photo-thermal power station fused salt can be fully met
Requirement of the storage tank to material property, excellent corrosion-proof performance (American Standard intercrystalline corrosion E method is qualified), microstructure is very beneficial for machine
(grain size grading≤7, ferrite content also have 400-600 DEG C of excellent height less than 5%) for tool performance and welding performance
Warm intensity (400 DEG C of high-temperature yield strength >=141MPa, 400 DEG C of tensile strength >=400MPa；525 DEG C of high-temperature yield strengths >=
139MPa, 525 DEG C of tensile strength >=390MPa；590 DEG C of high-temperature yield strength >=135MPa, 590 DEG C of tensile strength >=
350MPa).Material can be used for producing hot rolled plate.
In addition, austenitic stainless steel of the invention is in addition to can be applied to solar energy thermo-power station as high temperature lava storage tank
Outside material, the performance for being also applied to other pairs of austenitic stainless steels has the field of particular/special requirement, such as: manufacture high temperature resistant, water steam
Gas and corrosion resistant components.
On the other hand, the present invention provides a kind of preparation methods of austenitic stainless steel, comprising the following steps:
(1) continuous casting billet is smelted；
Specifically, smelting continuous casting billet using Ar-O_2 furnace and ladle refining furnace, it can effectively reduce the impurity elements such as S, P and contain
Amount.
(2) continuous casting billet is heated to 1250 DEG C -1300 DEG C, keeps the temperature 90-150 minutes；Preferably, by the continuous casting billet
It is heated to 1250-1280 DEG C, keeps the temperature 100-150 minutes, to guarantee that precipitated phase is sufficiently dissolved, improves start rolling temperature.
Specifically, being heated using continuous-type furnace to the continuous casting billet.
(3) hot rolling is carried out to the continuous casting billet and obtains hot rolled plate, wherein broadening pass deformation rate 10-15%, axial rolling passage
Deformation rate 20-40%, 1050-1150 DEG C of finishing temperature；Preferably, the broadening pass deformation rate is 10-15%, the axial rolling
Pass deformation rate is 25-30%, and the finishing temperature is 1050-1100 DEG C.Perfect recrystallization degree can be improved by hot rolling,
Ensure the long large driving force of enough crystal grain.
Wherein, the hot rolling is multistage hot deformation.
(4) hot rolled plate is heated to 1100 DEG C -1200 DEG C, keeps the temperature 60-90 minutes；Preferably, by the hot rolled plate
It is heated to 1100-1180 DEG C, keeps the temperature 60-90 minutes.In this step by being heated and being kept the temperature hot rolled plate, it can be ensured that
Crystal grain is grown up and ferritic transformation.
Specifically, being heated using normalizing furnace to the hot rolled plate.
(5) it quenches.
Wherein, the quenching is method commonly used in the art, and this will not be repeated here by the present invention.
The austenitic stainless steel prepared by the above method, by weight percentage, including C 0.04-0.08%, Si
0.5-1.5%, Mn 1.0-3.0%, Cr 16-18%, Ni 8-10%, Nb 0.50-1.00%, N 0.02-0.06%, P≤
0.025%, S≤0.010%, (0.5 × Nb)/(30 × C+50 × N)≤0.12, surplus are Fe and inevitable impurity；It is preferred that
, by weight percentage, including C 0.04-0.06%, Si 0.5-1.0%, Mn 1.0-1.5%, Cr 17-17.5%, Ni
9-9.5%, Nb 0.60-0.80%, N 0.02-0.04%, P≤0.025%, S≤0.010%, (0.5 × Nb)/(30 × C+
50 × N)≤0.11, surplus is Fe and inevitable impurity.
Austenitic stainless steel preparation method of the invention influences each key element of mechanical behavior under high temperature by Proper Match
(such as carbon, nitrogen, niobium) content, and using targetedly material preparation process, it is wanted in guarantee material corrosion resistance and microstructure
While asking, high-temperature behavior of the material at 400-600 DEG C is further improved, it may be assumed that 400 DEG C of high-temperature yield strengths >=
141MPa, 400 DEG C of tensile strength >=400MPa；525 DEG C of high-temperature yield strength >=139MPa, 525 DEG C of tensile strength >=390MPa；
590 DEG C of high-temperature yield strength >=135MPa, 590 DEG C of tensile strength >=350MPa.
In further preferred specific embodiment, the preparation method of the austenitic stainless steel, comprising the following steps:
(1) continuous casting billet is smelted；
(2) continuous casting billet is heated to 1250 DEG C -1280 DEG C, keeps the temperature 100-150 minutes；
(3) hot rolling is carried out to the continuous casting billet and obtains hot rolled plate, wherein broadening pass deformation rate 10-15%, axial rolling passage
Deformation rate 25-30%, 1050-1100 DEG C of finishing temperature；
(4) hot rolled plate is heated to 1100 DEG C -1180 DEG C, keeps the temperature 60-90 minutes.
(5) it quenches.
The performances such as high-temperature behavior, the corrosion resistance of the austenitic stainless steel being prepared by above-mentioned preparation method reach most
It is good.
Embodiment
The present invention is further illustrated below by the mode of embodiment, but does not therefore limit the present invention to the reality
It applies among a range.In the following examples, the experimental methods for specific conditions are not specified, according to conventional methods and conditions.Following implementation
Raw material used in example is that regular market purchase obtains.
Embodiment 1
Using 40t Ar-O_2 furnace (AOD) and 40t ladle refining furnace (LF furnace) smelting stainless steel, continuous casting billet is heated in continous way
It is heated to 1300 DEG C in furnace, keeps the temperature 90min, is rolled into 32mm thickness hot rolled plate, broadens pass deformation rate 12-15%, axial rolling passage
Deformation rate 20-30%, 1080 DEG C of finishing temperature.1150 DEG C of hot-roll annealing temperature, keep the temperature quenching after 60min.The present embodiment
The chemical component of austenitic stainless steel is shown in Table 1, and microstructure photo is shown in Fig. 1.
Embodiment 2
Using 180t Ar-O_2 furnace (AOD) and 180t ladle refining furnace (LF furnace) smelting stainless steel, continuous casting billet adds in continous way
It is heated to 1280 DEG C in hot stove, keeps the temperature 120min, is rolled into 50mm thickness hot rolled plate, broadens pass deformation rate 10-13%, axial rolling road
Secondary deformation rate 20-25%, 1050 DEG C of finishing temperature.1120 DEG C of hot-roll annealing temperature, keep the temperature quenching after 90min.The present embodiment
The chemical component of austenitic stainless steel be shown in Table 1.
Embodiment 3
Using 40t Ar-O_2 furnace (AOD) and 40t ladle refining furnace (LF furnace) smelting stainless steel, continuous casting billet is heated in continous way
It is heated to 1250 DEG C in furnace, keeps the temperature 150min, is rolled into 28mm thickness hot rolled plate, broadens pass deformation rate 10-12%, axial rolling passage
Deformation rate 25-33%, 1070 DEG C of finishing temperature.1100 DEG C of hot-roll annealing temperature, keep the temperature quenching after 70min.The present embodiment
The chemical component of austenitic stainless steel is shown in Table 1.
Embodiment 4
Using 40t Ar-O_2 furnace (AOD) and 40t ladle refining furnace (LF furnace) smelting stainless steel, continuous casting billet is heated in continous way
It is heated to 1280 DEG C in furnace, keeps the temperature 100min, is rolled into 60mm thickness hot rolled plate, broadens pass deformation rate 11-15%, last pass
Deformation rate 20-25%, 1150 DEG C of finishing temperature.1100 DEG C of hot-roll annealing temperature, keep the temperature quenching after 90min.The present embodiment
The chemical component of austenitic stainless steel is shown in Table 1.
Embodiment 5
Using 180t Ar-O_2 furnace (AOD) and 180t ladle refining furnace (LF furnace) smelting stainless steel, continuous casting billet adds in continous way
It is heated to 1300 DEG C in hot stove, keeps the temperature 140min, is rolled into 12mm thickness hot rolled plate, broadens pass deformation rate 10-11%, finish to gauge road
Secondary deformation rate 25-40%, 1050 DEG C of finishing temperature.1200 DEG C of hot-roll annealing temperature, keep the temperature quenching after 60min.The present embodiment
The chemical component of austenitic stainless steel be shown in Table 1.
Embodiment 6
Using 180t Ar-O_2 furnace (AOD) and 180t ladle refining furnace (LF furnace) smelting stainless steel, continuous casting billet adds in continous way
It is heated to 1260 DEG C in hot stove, keeps the temperature 150min, is rolled into 20mm thickness hot rolled plate, broadens pass deformation rate 13-15%, finish to gauge road
Secondary deformation rate 25-33%, 1060 DEG C of finishing temperature.1180 DEG C of hot-roll annealing temperature, keep the temperature quenching after 60min.The present embodiment
The chemical component of austenitic stainless steel be shown in Table 1.
Comparative example
Using 40t electric furnace (AOD) and 40t ladle refining furnace (LF furnace) smelting stainless steel, continuous casting billet is in continuous-type furnace
1240 DEG C are inside heated to, 160min is kept the temperature, is rolled into 28mm thickness hot rolled plate, broadens pass deformation rate 7-10%, last pass becomes
Form quotient 15-23%, 900 DEG C of finishing temperature.1210 DEG C of hot-roll annealing temperature, keep the temperature quenching after 30min.The Ovshinsky of the present embodiment
The chemical component of body stainless steel is shown in Table 1.
The chemical component (wt%) of 1 austenitic stainless steel of table
Physicochemical property test
In order to detect each embodiment and comparative example preparation austenitic stainless steel performance, inventor to ferrite content,
Intercrystalline corrosion, grain size and high-temperature behavior are determined.Wherein the measuring method of each performance is method commonly used in the art, herein
It does not repeat them here.Wherein, the austenitic stainless steel hot rolled plate results of property of embodiment 1-6 and comparative example 1-2 preparation is shown in Table 2.
2 austenitic stainless steel hot rolled plate performance of table
It can be seen from Table 2 that the ferrite content and grain size of austenitic stainless steel of the present invention are often conducive to material in height
Long service under the conditions of temperature, while 400-600 DEG C of high temperature yield and tensile strength are obviously improved, and solar energy is fully met
The requirement of thermo-power station fused salt storage tank.
The present invention is hereinbefore disclosed with preferred embodiment, but it should be understood by those skilled in the art that, these
Embodiment is only used for describing the present invention, but should not be understood as limiting the scope of the invention.It should be noted that all implement with these
Example equivalent variation and displacement, should all be set as being covered by scope of the presently claimed invention.Therefore, protection scope of the present invention
It should be subject to range defined in claims.
Claims (10)
1. a kind of austenitic stainless steel, which is characterized in that by weight percentage, including C 0.04-0.08%, Si 0.5-
1.5%, Mn 1.0-3.0%, Cr 16-18%, Ni 8-10%, Nb 0.50-1.00%, N 0.02-0.06%, P≤
0.025%, S≤0.010%, (0.5 × Nb)/(30 × C+50 × N)≤0.12, surplus are Fe and inevitable impurity.
2. according to austenitic stainless steel as claimed in claim 2, which is characterized in that by weight percentage, including C 0.04-
0.06%, Si 0.5-1.0%, Mn 1.0-1.5%, Cr 17-17.5%, Ni 9-9.5%, Nb 0.60-0.80%, N
0.02-0.04%, P≤0.025%, S≤0.010%, (0.5 × Nb)/(30 × C+50 × N)≤0.11, surplus is for Fe and not
Evitable impurity.
3. the preparation method of austenitic stainless steel of any of claims 1 or 2, which comprises the following steps:
(1) continuous casting billet is smelted；
(2) continuous casting billet is heated to 1250-1300 DEG C, keeps the temperature 90-150 minutes；
(3) hot rolling is carried out to the continuous casting billet and obtains hot rolled plate, wherein broadening pass deformation rate 10-15%, the deformation of axial rolling passage
Rate 20-40%, 1050-1150 DEG C of finishing temperature；
(4) hot rolled plate is heated to 1100-1200 DEG C, keeps the temperature 60-90 minutes；
(5) it quenches.
4. the preparation method of austenitic stainless steel according to claim 3, which is characterized in that in the step (2), by institute
It states continuous casting billet and is heated to 1250-1280 DEG C, keep the temperature 100-150 minutes.
5. the preparation method of austenitic stainless steel according to claim 3, which is characterized in that in the step (3), to institute
It states continuous casting billet progress hot rolling and obtains hot rolled plate, wherein broadening pass deformation rate 10-15%, axial rolling pass deformation rate 25-30%,
1050-1100 DEG C of finishing temperature.
6. the preparation method of austenitic stainless steel according to claim 3, which is characterized in that in the step (4), by institute
It states hot rolled plate and is heated to 1100-1180 DEG C, keep the temperature 60-90 minutes.
7. the preparation method of austenitic stainless steel according to claim 3, which is characterized in that in the step (1), use
Ar-O_2 furnace and ladle refining furnace smelt continuous casting billet.
8. the preparation method of austenitic stainless steel according to claim 3 or 4, which is characterized in that in the step (2),
The continuous casting billet is heated using continuous-type furnace.
9. the preparation method of the austenitic stainless steel according to claim 3 or 5, which is characterized in that in the step (3),
The hot rolling is multistage hot deformation.
10. the preparation method of the austenitic stainless steel according to claim 3 or 6, which is characterized in that in the step (4),
The hot rolled plate is heated using normalizing furnace.
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| CN114908294A (en) * | 2022-05-19 | 2022-08-16 | 山西太钢不锈钢股份有限公司 | High-temperature-resistant austenitic stainless steel cold-rolled sheet for automobile exhaust system and manufacturing method thereof |
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