CN114472525B - Method for improving flatness of stainless steel cold-rolled plate lined in low-temperature liquid container - Google Patents
Method for improving flatness of stainless steel cold-rolled plate lined in low-temperature liquid container Download PDFInfo
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- CN114472525B CN114472525B CN202210137872.7A CN202210137872A CN114472525B CN 114472525 B CN114472525 B CN 114472525B CN 202210137872 A CN202210137872 A CN 202210137872A CN 114472525 B CN114472525 B CN 114472525B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000007788 liquid Substances 0.000 title claims abstract description 14
- 229910001220 stainless steel Inorganic materials 0.000 title abstract description 30
- 239000010935 stainless steel Substances 0.000 title abstract description 30
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 29
- 239000010959 steel Substances 0.000 claims abstract description 29
- 238000005097 cold rolling Methods 0.000 claims abstract description 21
- 239000006104 solid solution Substances 0.000 claims abstract description 19
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 239000000243 solution Substances 0.000 claims abstract description 13
- 239000010960 cold rolled steel Substances 0.000 claims abstract description 11
- 238000005098 hot rolling Methods 0.000 claims abstract description 9
- 238000002360 preparation method Methods 0.000 claims abstract description 9
- 239000002253 acid Substances 0.000 claims abstract description 4
- 238000004140 cleaning Methods 0.000 claims abstract description 3
- 238000005096 rolling process Methods 0.000 claims description 36
- 238000004321 preservation Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 239000000463 material Substances 0.000 description 7
- 238000005554 pickling Methods 0.000 description 7
- 239000013078 crystal Substances 0.000 description 4
- 238000000137 annealing Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/44—Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
Abstract
The invention provides a preparation method of an austenitic stainless steel strip, which comprises the following steps: (1) Carrying out solid solution treatment, acid cleaning treatment and straightening treatment on the hot rolling raw material coil to obtain a steel strip with the maximum plate shape unevenness within 5mm; (2) Carrying out cold rolling treatment on the steel strip with the maximum plate shape unevenness within 5mm by adopting a twenty-roller cold rolling unit to obtain a cold-rolled steel strip; (3) Carrying out low-temperature long-time solution treatment on the cold-rolled steel strip; (4) Adopting a straightening unit to carry out plate shape straightening treatment on the steel strip after the solution treatment to obtain the steel strip with the plate shape maximum unevenness within 1 mm; (5) And flattening the steel strip with the maximum unevenness of the plate shape within 1mm by using a flattening machine to ensure that the maximum unevenness of the plate shape is less than or equal to 0.5mm. According to the invention, through multi-process linkage control in the production process of the stainless steel cold-rolled steel strip, the stainless steel cold-rolled product with the maximum unevenness within 0.5mm and uniform flatness is prepared, and the use requirement of the lining of the low-temperature liquid container is met.
Description
Technical Field
The invention relates to the technical field of stainless steel production, in particular to a preparation method of a high-flatness stainless steel strip, and more particularly relates to a preparation method of a high-flatness stainless steel lining for a low-temperature liquid container.
Background
The stainless steel lining of the low-temperature liquid container needs to be welded, so that the maximum unevenness of a stainless steel raw material product is required to be not more than 0.5mm in order to ensure the quality of a joint, the thickness and the performance of the material are required to be stable, and the difference of the performances in all directions is small, so that the stability of the product is ensured. At present, the unevenness requirement of domestic common products on cold-rolled stainless steel raw materials is mainly concentrated within 3mm, and the special requirement of the low-temperature liquid container liner on the shape of a stainless steel material plate cannot be guaranteed by the control means of the common stainless steel products.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for improving the flatness of a stainless steel cold-rolled plate of a lining of a low-temperature liquid container, so that the use requirement of the lining of the low-temperature liquid container is met, and the technical condition that the maximum unevenness of all materials is within 0.5mm is achieved.
Specifically, the invention is realized by the following technical scheme:
a method of making an austenitic stainless steel strip comprising:
(1) Carrying out solid solution treatment, acid cleaning treatment and straightening treatment on the hot rolling raw material coil to obtain a steel strip with the maximum plate shape unevenness within 5mm;
(2) Carrying out cold rolling treatment on the steel strip with the maximum plate shape unevenness within 5mm by adopting a twenty-roller cold rolling unit to obtain a cold-rolled steel strip;
(3) Carrying out low-temperature long-time solution treatment on the cold-rolled steel strip;
(4) Adopting a straightening unit to carry out plate shape straightening treatment on the steel strip after the solution treatment to obtain the steel strip with the plate shape maximum unevenness within 1 mm;
(5) And flattening the steel strip with the maximum unevenness of the plate shape within 1mm by using a flattening machine to ensure that the maximum unevenness of the plate shape is less than or equal to 0.5mm.
Optionally, the austenitic stainless steel is 304L austenitic stainless steel, the Ni content is 10.05-10.5%, and Creq/Nieq ≦ 1.70, wherein Creq = Cr% +1.5 × Si% + Mo%; nieq = Ni% +0.5 × Mn% +30C% +30N%.
Optionally, in the step (1), the hot-rolled raw material coil is prepared by a hot continuous rolling mill group, the deformation rate is 65-68%, and the rolling thickness is 3.35-3.65 mm.
Optionally, in the step (1), the temperature of the solution treatment is 1130-1160 ℃, and the heat preservation time is 0.8-1.0 min/mm; the elongation of the withdrawal and straightening treatment is 2.8-3.5%.
Optionally, in the step (2), the cold rolling treatment adopts 9 passes of rolling, and the deformation rate of each pass is 18% -20%, 10% -13%, 8% -10%, 7% -9%, 6% -7%, 5% -6%, 3% -5% and 3% -5% in sequence; the tension before and after the cold rolling treatment is less than or equal to 50 tons, and the pass rolling speed of the finished product is less than or equal to 50m/min.
Optionally, in the step (3), the temperature of the low-temperature long-term solution treatment is 1060-1080 ℃, and the holding time is 3-4 min/mm.
Optionally, in the step (4), the tension of the plate shape straightening treatment is 32-35 tons, and the elongation is 0.3% -0.6%; the withdrawal and straightening unit is provided with three groups of withdrawal and straightening rollers, and the rolling reduction is respectively 25-30 mm, 25-30 mm and 35-40 mm.
Optionally, in the step (5), the tension applied in the leveling treatment is 14 to 15 tons, and the elongation is less than or equal to 0.2%.
An austenitic stainless steel strip is obtained by the preparation method.
The use of the austenitic stainless steel strip described above for the preparation of a low temperature liquid vessel lining.
Compared with the prior art, the technical scheme of the invention at least has the following beneficial effects:
according to the invention, through linkage control of multiple working procedures in the production process of the stainless steel cold-rolled steel strip, the stainless steel cold-rolled product with the maximum unevenness within 0.5mm and uniform flatness is prepared. Specifically, the unevenness of the stainless steel strip prepared by the method is measured to be less than or equal to 0.5mm after sampling, and the unevenness of the sample is continuously measured to be less than or equal to 0.5mm on the reverse side of the test platform, so that the technical requirement of the stainless steel strip for the lining of the low-temperature liquid container is met.
Drawings
FIG. 1 shows that the prior steel strip has poor plate shape and cannot meet the technical requirement of 0.5mm.
Fig. 2 shows a schematic diagram of a plate shape detection method in an embodiment of the invention, wherein CALIBRATEDRULER represents a "calibration ruler".
Figure 3 shows the flatness of the steel strip produced in example 2 of the invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
At present, the control means of the stainless steel product can only ensure that the unevenness of the cold-rolled stainless steel raw material can meet the requirement within 3mm, but can not meet the requirement that the maximum unevenness of the stainless steel raw material product of the lining of the low-temperature liquid container does not exceed 0.5mm, as shown in figure 1.
Aiming at the problem, the inventor of the invention carries out deep research, and provides a multi-process linkage control means of hot wire stretching and straightening unit, twenty-roller cold rolling mill, low-temperature long-time solid solution treatment and leveling and pulling and straightening, so that hot wire pulling and straightening tension and reduction, twenty-roller cold rolling pass and pass deformation rate are reasonably matched, key process parameters such as cold rolling tension, cold rolling speed, solid solution treatment, pulling, straightening and leveling and the like are optimally controlled, favorable conditions are created for improving the shape and uniformity of various properties by adopting various technical measures, and the problems of the shape of a high-unevenness cold-rolled stainless steel strip, the difference of various properties and stability are controlled.
Based on the inventive concept, the invention provides a preparation method of an austenitic stainless steel strip. The austenitic stainless steel aimed by the method adopts 304L austenitic stainless steel in the standard ASTM A240, the Ni content is controlled to be 10.05-10.5 wt%, and the Creq/Nieq is less than or equal to 1.70, wherein the Creq = Cr% +1.5 xSi% + Mo%; nieq = Ni% +0.5 × Mn% +30C% +30N%, where "elemental%" denotes the weight content of the element in the stainless steel, for example "Cr%" denotes the weight content of Cr in the stainless steel.
In the invention, the Ni content and the Cr/Ni equivalent ratio are controlled, so that the austenite stability is improved, the tendency of deformation martensite in the cold working process is reduced, the performance difference of materials is reduced, and finally the unevenness of the steel strip is improved.
The preparation method of the austenitic stainless steel strip comprises the following steps:
(1) Preparing a hot rolling raw material coil, and carrying out solid solution, acid pickling and withdrawal and straightening treatment.
The hot rolling raw material coil is prepared by adopting a hot continuous rolling unit, the reasonable matching deformation rate is 65-68% for ensuring the shape and the performance, for example, 65%, 66%, 67% or 68% and the like, and the rolling thickness is determined to be 3.5 +/-0.15 mm.
In a continuous annealing and pickling production line, the hot rolling raw material coil is subjected to solid solution pickling, the solid solution temperature is 1130-1160 ℃ (such as 1130 ℃, 1140 ℃, 1150 ℃ or 1160 ℃ and the like), and the heat preservation time is 0.8-1.0 min/mm (such as 0.8min/mm, 0.9min/mm or 1.0min/mm and the like), namely, 0.8-1.0 min per millimeter according to the thickness of the hot rolling raw material coil. The plate shape is improved by three groups of stretching and straightening machines, the control is carried out according to a large elongation mode, the elongation is controlled to be between 2.8 and 3.5 percent (for example, 2.8 percent, 2.9 percent, 3.0 percent, 3.1 percent, 3.2 percent, 3.3 percent, 3.4 percent or 3.5 percent and the like), and the maximum unevenness of the steel strip is controlled to be within 5mm.
(2) And (5) cold rolling treatment.
And (3) cold rolling the hot-rolled coil treated in the step (1) by using a twenty-roll cold rolling mill group (for example, a Sendzimir twenty-roll cold rolling mill group) by selecting working rolls with 20-pass convexity. The deformation ratio per pass in 9-pass rolling is controlled in accordance with 18 to 20% (e.g., 18%, 19%, or 20%), 10 to 13% (e.g., 10%, 11%, 12%, or 13%), 8 to 10% (e.g., 8%, 9%, or 10%), 7 to 9% (e.g., 7%, 8%, or 9%), 6 to 7% (e.g., 6%, or 7%), 5 to 6% (e.g., 5%, or 6%), 3 to 5% (e.g., 3%, 4%, or 5%). The tension before and after rolling is reduced, the tension before and after rolling is required to be less than or equal to 50 tons, and the rolling speed of the pass of the finished product is required to be less than or equal to 50m/min, so that the edge waves and rib stripes are prevented from occurring in the rolling process.
(3) And (5) performing low-temperature long-time solution treatment.
The cold-rolled steel strip is subjected to low-temperature long-time solution treatment, the solution treatment temperature is 1060-1080 ℃ (for example, 1060 ℃, 1065 ℃, 1070 ℃, 1075 ℃ or 1080 ℃ and the like), the heat preservation time is 3-4 min/mm (for example, 3.0min/mm, 3.1min/mm, 3.2min/mm, 3.3min/mm, 3.4min/mm, 3.5min/mm, 3.6min/mm, 3.7min/mm, 3.8min/mm, 3.9min/mm or 4.0min/mm and the like), the surface and the central crystal grains of the product are kept consistent, the nonuniformity of material performance is eliminated, and the uniformity of various performances of the product is ensured.
(4) And (5) straightening the plate shape.
And (3) straightening the plate shape of the solid-dissolved steel strip on a straightening and withdrawing unit with three groups of straightening and withdrawing rollers, and adopting a 'small-tension, large-bending and small-elongation' straightening and withdrawing method to ensure that the poor plate shape caused by stress deformation in the solid-solution process is improved, and meanwhile, the structure of the material is not changed. Specifically, the tension of the plate shape is controlled to be 32 to 35 tons (for example, 32 tons, 33 tons, 34 tons, or 35 tons), the rolling amounts of the 3 sets of pulling and straightening rolls are controlled to be 25 to 30mm (for example, 25mm, 26mm, 27mm, 28mm, 29mm, or 30 mm), 35 to 40mm (for example, 35mm, 36mm, 37mm, 38mm, 39mm, or 40 mm), the elongation is controlled to be 0.3 to 0.6% (for example, 0.3%, 0.4%, 0.5%, or 0.6%), and the maximum unevenness of the plate shape is controlled to be within 1 mm.
(5) And (6) leveling.
The steel strip after being pulled and straightened is leveled on a two-roll leveler, a working roll with 30 passes of convexity is selected, a control means of 'small tension and small extension' is adopted, the tension is specifically controlled to be 14-15 tons (for example, 14.0 tons, 14.1 tons, 14.2 tons, 14.3 tons, 14.4 tons, 14.5 tons, 14.6 tons, 14.7 tons, 14.8 tons, 14.9 tons or 15.0 tons) and the elongation is controlled to be within 0.2 percent, and the maximum unevenness of the plate shape is controlled to be within 0.5mm.
The invention provides a multi-process linkage control means of a hot wire stretching and straightening unit, a twenty-high-roll cold rolling mill, low-temperature long-time solid solution treatment and straightening and flattening, and particularly, the hot wire stretching and straightening machine controls the unevenness of a steel strip to be within 5mm, so that stable feeding is facilitated during the rolling of the twenty-high-roll mill, the tension and the pressure are kept to be stable in a fixed parameter mode during the rolling of the twenty-high-roll mill, and the unevenness control in the rolling process is further realized. On the basis of high-unevenness plate shape of a rolling mill, low-temperature long-time solution treatment is adopted to keep the surface and central crystal grains of a product consistent, the performance nonuniformity of the material is eliminated, the plate shape change caused by the performance nonuniformity is reduced, the subsequent pulling, straightening and flattening procedures are matched on the basis, the plate shape is further optimized, and the maximum unevenness is controlled within 0.5mm.
Examples
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
The following embodiments are specific detection methods for detecting the plate shape: flatness is measured using a calibration ruler and a calibration gauge, which is moved laterally or diagonally along the surface of the steel plate to find the maximum gap between the sheet and the ruler. As shown in fig. 2.
Example 1:
the specification of the finished product is 1.2 multiplied by 1500mm stainless steel strip. The Ni content of 304L was 10.12, the Creq/Nieq was 1.63 (wherein Cr:19.37%, ni:10.08%, mn:1.15%, si:0.44%, mo:0.03%, C:0.013%, N: 0.042%), and the production was specifically controlled as follows:
(1) and preparing a hot rolling raw material coil in a hot continuous rolling unit, wherein the rolling thickness is 3.5mm.
(2) And carrying out solid solution pickling on the hot rolled coil on a continuous annealing pickling production line, wherein the solid solution temperature is 1150 ℃ and the heat preservation time is 0.9min/mm. The elongation of the stretch leveler was controlled at 2.8%, and the maximum unevenness of the steel strip was 4mm.
(3) And (3) rolling the hot coil in a twenty-roller cold rolling unit, wherein the convexity of a working roller is 20 times, 9 times of rolling are adopted, the deformation rate of each time is controlled according to 18%, 11%, 8%, 6%, 5%, 4% and 3%, the tension before and after rolling is 48 tons, the rolling speed of a finished product pass is 45m/min, and the thickness of a finished product is 1.2 +/-0.02 mm.
(4) And (3) carrying out solid solution on the cold-rolled steel strip at the temperature of 1080 ℃, keeping the heat preservation time for 3min/mm, keeping the surface and the central crystal grains of the product consistent, and ensuring that the grain size is 8-grade.
(5) And (3) carrying out plate shape drawing and straightening on the steel strip subjected to solid solution, wherein the drawing and straightening tension is 35 tons, the rolling reduction of 3 groups of drawing and straightening rollers is respectively 28mm, 28mm and 35mm, the elongation is 0.5%, and the maximum plate shape unevenness is 0.9mm.
(6) And flattening the pulled and corrected steel strip, wherein the convexity of a working roll is 30 times, the flattening tension is 15 tons, and the elongation is 0.2 percent.
The stainless steel strip of the embodiment is adopted, the maximum unevenness of the stainless steel strip is measured to be 0.3mm after sampling, and the unevenness of the sample is continuously measured to be 0.35mm on the upper surface and the reverse surface of the inspection platform, so that the technical requirement of the stainless steel strip for the lining of the low-temperature liquid container is met.
Example 2:
the finished product specification is 1.2 multiplied by 1250mm stainless steel strip. The Ni content of 304L is 10.15, the Creq/Nieq is 1.46 (wherein Cr is 18.08%, ni is 10.24%, mn is 1.07%, si is 0.35%, mo is 0.02%, C is 0.016%, N is 0.051%), and the specific production control is as follows:
(1) and preparing a hot rolling raw material coil in a hot continuous rolling unit, wherein the rolling thickness is 3.5mm.
(2) On a continuous annealing and pickling production line, the hot rolled coil is subjected to solid solution pickling, the solid solution temperature is 1140 ℃, and the heat preservation time is 1.0min/mm. The elongation of the stretching straightener is controlled according to 3.0 percent, and the maximum unevenness of the steel strip is 3.5mm.
(3) And (3) rolling the hot coil in a twenty-roller cold rolling unit, wherein the convexity of a working roller is 20 times, 9 times of rolling are adopted, the deformation rate of each time is controlled according to 19%, 11%, 8%, 7%, 6%, 5%, 3% and 3%, the tension before and after rolling is 45 tons, the rolling speed of a finished product is 50m/min, and the thickness of a finished product is 1.2 +/-0.015 mm.
(4) And (3) carrying out solid solution on the cold-rolled steel strip according to the temperature of 1070 ℃, keeping the heat preservation time for 4min/mm, and keeping the surface and the central crystal grains of the product consistent and having the grain size of 8.5 grade.
(5) And (3) carrying out plate shape pulling and straightening on the steel strip subjected to solid solution, wherein the pulling and straightening tension is 32 tons, the rolling reduction of 3 groups of pulling and straightening rollers is respectively 25mm, 25mm and 38mm, the elongation is 0.4%, and the maximum plate shape unevenness is 0.8mm.
(6) And flattening the pulled and corrected steel strip, wherein the convexity of a working roll is 30 times, the flattening tension is 14 tons, and the elongation is 0.15 percent.
The stainless steel band prepared by the method has the maximum unevenness of 0.15mm after sampling, and the unevenness of 0.2mm is continuously measured on the reverse side of the test platform, so that the technical requirements of the stainless steel band for the lining of the low-temperature liquid container are met, and the technical requirements are shown in figure 3.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other substitutions, modifications, combinations, changes, simplifications, etc., which are made without departing from the spirit and principle of the present invention, should be construed as equivalents and included in the protection scope of the present invention.
Claims (3)
1. A preparation method of an austenitic stainless steel strip is characterized by comprising the following steps:
(1) Carrying out solid solution treatment, acid cleaning treatment and straightening treatment on the hot rolling raw material coil to obtain a steel strip with the maximum plate shape unevenness within 5mm;
(2) Carrying out cold rolling treatment on the steel strip with the maximum flatness of the strip shape within 5mm by adopting a twenty-roller cold rolling unit to obtain a cold-rolled steel strip;
(3) Carrying out low-temperature long-time solution treatment on the cold-rolled steel strip;
(4) Adopting a straightening unit to carry out plate shape straightening treatment on the steel strip after the solution treatment to obtain the steel strip with the plate shape maximum unevenness within 1 mm;
(5) Flattening the steel strip with the maximum unevenness of the plate shape within 1mm by using a flattening machine to enable the maximum unevenness of the plate shape to be less than or equal to 0.5mm;
wherein the austenitic stainless steel is 304L austenitic stainless steel, the Ni content is 10.05-10.5%, and Creq/Nieq is less than or equal to 1.70, wherein Creq = Cr% +1.5 xSi% + Mo%; nieq = Ni% +0.5 × Mn% +30C% +30N%;
in the step (1), the hot-rolled raw material coil is prepared by a hot continuous rolling unit, the deformation rate is 65-68%, and the rolling thickness is 3.35-3.65mm; the temperature of the solution treatment is 1130-1160 ℃, and the heat preservation time is 0.8-1.0 min/mm; the elongation of the withdrawal and straightening treatment is 2.8% -3.5%;
in the step (2), the cold rolling treatment adopts 9-pass rolling, and the deformation rate of each pass is 18% -20%, 10% -13%, 8% -10%, 7% -9%, 6% -7%, 5% -6%, 3% -5% and 3% -5% in sequence; the tension before and after the cold rolling treatment is less than or equal to 50 tons, and the pass rolling speed of a finished product is less than or equal to 50m/min;
wherein in the step (3), the temperature of the low-temperature long-time solid solution treatment is 1060-1080 ℃, and the heat preservation time is 3-4 min/mm;
in the step (4), the tension of the plate shape straightening treatment is 32-35 tons, and the elongation is 0.3-0.6%; the pulling and straightening unit is provided with three groups of pulling and straightening rollers, and the rolling reduction is respectively 25 to 30mm, 25 to 30mm and 35 to 40mm;
in the step (5), the tension adopted by the leveling treatment is 14 to 15 tons, and the elongation is less than or equal to 0.2 percent.
2. An austenitic stainless steel strip, characterized in that it is obtained by the method according to claim 1.
3. Use of the austenitic stainless steel strip of claim 2 in the preparation of a low temperature liquid vessel liner.
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