Ce-containing stainless steel plate and preparation method thereof

Abstract

The invention provides a Ce-containing stainless steel plate and a preparation method thereof, and relates to the technical field of metallurgy, the stainless steel plate comprises the following components by mass: 0.13%-0.163% of C, 0.33%-0.57% of Si, 8.13%-9.26% of Mn, less than or equal to 0.049% of P, less than or equal to 0.002% of S, 1301%-13.27% of Cr, 1.11%-1.24% of Ni, 0.20%-0.218% of Cu, 0.137%-0.163% of N, 20-50 ppm of Ce, and the balance Fe and inevitable impurities; preferably, the content of Ce is 20 to 45 ppm, and further preferably, the content of Ce is 30 to 45 ppm; the thickness of the stainless steel plate is 2-3 mm. According to the preparation method, the solidification structure of the stainless steel is improved, the grain structure of the stainless steel is refined, and the mechanical property and corrosion resistance of the stainless steel are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of metallurgy, and in particular to a stainless steel plate containing Ce and a preparation method thereof. Background Art

[0002] The steel industry is a vital foundational sector of my country's national economy. my country is a major steel producer, with crude steel output reaching 1.013 billion tons in 2022, accounting for 55.3% of the world's total, ranking first globally. With the upgrading of my country's manufacturing industry, the quality requirements for steel materials are becoming increasingly stringent, particularly in sectors such as special vehicles, rail transit, and aerospace, posing new challenges to steel performance.

[0003] Rare earth elements are known as the "vitamins" of modern industry. Adding appropriate amounts of rare earth elements to steel can significantly improve its mechanical properties, corrosion resistance, and wear resistance, and significantly enhance the cleanliness, homogenization, and grain refinement of high-quality steel. As a key steel additive, rare earth elements significantly impact the deep purification of steel, modify inclusions, and enhance its performance. They are both an effective means of improving steel quality and a key measure for developing new steel varieties.

[0004] my country began research on rare earth steel in the late 1950s. However, due to limitations in refining technology at the time, the steel contained high levels of impurities such as oxygen and sulfur, making the steel's performance unstable after adding rare earth elements. With improvements in refining technology, the levels of these impurities have been effectively controlled, effectively ensuring the application of rare earth elements in steel. However, the production of rare earth steel still faces challenges. Developing clean, nickel-saving rare earth stainless steel, improving its mechanical and corrosion properties, and achieving stable, large-scale production remain challenges.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a Ce-containing stainless steel plate and a preparation method thereof, to develop clean rare earth nickel-saving stainless steel, to promote the improvement of the solidification structure and grain refinement of nickel-saving stainless steel, to enhance the mechanical properties and corrosion resistance of nickel-saving stainless steel, and to realize the large-scale stable production of rare earth stainless steel.

[0007] A first aspect of the present invention provides a Ce-containing stainless steel plate, wherein the composition of the stainless steel plate is as follows by mass: C: 0.13%-0.163%, Si: 0.33%-0.57%, Mn: 8.13%-9.26%, P: ≤0.049%, S: ≤0.002%, Cr: 13.01%-13.27%, Ni: 1.11%-1.24%, Cu: 0.20%-0.218%, N: 0.137%-0.163%, Ce: 20-50 ppm, and the remainder being Fe and unavoidable impurities;

[0008] Preferably, the Ce content is 20-45 ppm, more preferably 30-45 ppm;

[0009] The thickness of the stainless steel plate is 2-3 mm.

[0010] The second aspect of the present invention provides a method for manufacturing the Ce-containing stainless steel plate described in the first aspect, comprising: smelting, LF refining, continuous casting, and rolling steps. In the LF refining, ferrosilicon is added for smelting and sampling and analysis, and then the Ce-containing alloy is added, and soft blowing is performed immediately after the Ce-containing alloy is added; ferrosilicon is added at the initial stage of the LF refining, and the temperature of the molten steel is 1455-1545°C when the ferrosilicon is added; and the tapping temperature of the LF refining is 1520-1535°C.

[0011] As an optional embodiment of the method for manufacturing a Ce-containing stainless steel plate of the present invention, the Ce-containing alloy is added by blowing out slag holes in the slag, and then adding the Ce-containing alloy from the slag holes.

[0012] As an optional embodiment of the method for manufacturing a Ce-containing stainless steel plate of the present invention, the amount of the Ce-containing alloy added is calculated according to a ratio of 20-30 wt % of Ce yield in the stainless steel plate.

[0013] As an optional embodiment of the method for manufacturing a Ce-containing stainless steel plate of the present invention, the rolling is hot rolling.

[0014] As an optional embodiment of the method for manufacturing a Ce-containing stainless steel plate of the present invention, the Ce-containing alloy is added 15-25 minutes after the start of LF refining.

[0015] As an optional embodiment of the method for manufacturing a Ce-containing stainless steel plate of the present invention, the Ce-containing alloy is 20CeFe.

[0016] As an optional embodiment of the method for manufacturing a Ce-containing stainless steel plate of the present invention, the total time of the LF refining is 35 min-50 min.

[0017] As an optional implementation of the method for manufacturing a Ce-containing stainless steel plate of the present invention, the Ce-containing alloy is soft-blown for 15-20 minutes after being added.

[0018] The Ce-containing stainless steel plate described in the first aspect of the present invention or the Ce-containing stainless steel plate manufactured by the manufacturing method described in the second aspect has a grain size of 6.4-6.6, a transverse tensile strength of 1040-1052 MPa, an impact absorption energy of 90-102 J, a corrosion weight loss rate of 0.038-0.05 g·m-2·day-1, and a breakdown potential of 140-147.6 mV.

[0019] The present invention provides a Ce-containing stainless steel plate and a preparation method thereof, which have the following beneficial effects:

[0020] 1) By adding an appropriate amount of Ce to the composition of the stainless steel plate of the present invention, the steel plate has excellent corrosion resistance, plastic elongation strength, tensile strength and impact absorption energy.

[0021] 2) In the method for preparing the stainless steel plate of the present invention, the timing and method of adding the Ce-containing alloy and the soft blowing operation after adding the Ce alloy are strictly controlled to improve the yield of Ce. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a graph showing the corrosion weight loss rate of hot-rolled stainless steel plates with different cerium contents provided by the present invention;

[0024] Figure 2 The diagram of the effect of different cerium contents on the breakdown potential of the potentiodynamic polarization curve of the hot-rolled stainless steel plate provided by the present invention;

[0025] Figure 3 Metallographic field images of hot-rolled stainless steel plates with different cerium contents provided by the present invention;

[0026] Figure 4 The grain size influence diagram of hot-rolled stainless steel plates with different cerium contents provided by the present invention;

[0027] Figure 5 A graph showing the variation of the transverse tensile plastic elongation strength of hot-rolled stainless steel plates with different cerium contents provided by the present invention;

[0028] Figure 6This is a graph showing the transverse tensile strength of hot-rolled stainless steel plates with different cerium contents provided by the present invention;

[0029] Figure 7 This is a graph showing how the impact absorption energy of hot-rolled stainless steel plates with different cerium contents changes with the amount of rare earth added, as provided by the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. It should be understood by those skilled in the art that the embodiments are merely to help understand the present invention and should not be regarded as specific limitations of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention. The process parameters for which specific conditions are not specified in the following examples are generally in accordance with conventional conditions.

[0031] The endpoints of the ranges and any values ​​disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values ​​can be combined with each other to form one or more new numerical ranges, and these numerical ranges should be considered to be specifically disclosed in the present invention.

[0032] According to a first aspect of the present invention, a stainless steel plate containing Ce is provided, wherein the composition of the stainless steel is as follows by mass: C: 0.13%-0.163%, Si: 0.33%-0.57%, Mn: 8.13%-9.26%, P: ≤0.049%, S: ≤0.002%, Cr: 13.01%-13.27%, Ni: 1.11%-1.24%, Cu: 0.20%-0.218%, N: 0.137%-0.163%, Ce: 20-50 ppm, and the remainder is Fe and unavoidable impurities;

[0033] Preferably, the Ce content is 20-45 ppm, more preferably 30-45 ppm;

[0034] The stainless steel plate has a thickness of 2-3 mm. The inventors, through extensive testing, have found that adding only a small amount of Ce to stainless steel plates of this specification significantly improves the plate's grain size and mechanical properties, while also enhancing its corrosion resistance. However, excessive Ce addition is not recommended, as this significantly reduces the plate's overall performance and grain size.

[0035] According to the second aspect of the present invention, the present invention provides a method for manufacturing the Ce-containing stainless steel plate described in the first aspect, comprising: smelting, LF refining, continuous casting, and rolling steps. In the LF refining, ferrosilicon is added for smelting and sampling and analysis, and then the Ce-containing alloy is added, and soft blowing is performed immediately after the Ce-containing alloy is added; ferrosilicon is added at the initial stage of the LF refining, and the temperature of the molten steel when the ferrosilicon is added is 1455-1545°C (for example, 1460°C, 1480°C, 1490°C, 1500°C, 1510°C, 1520°C, 1530°C, 1540°C); the LF refining tapping temperature is 1520-1535°C (for example, 1525°C, 1530°C).

[0036] The smelting, LF refining, continuous casting, and rolling steps in the preparation method of the present invention can adopt conventional methods for producing stainless steel plates. However, in order to better control the composition of the molten steel, reduce impurities in the steel, and improve the recovery rate of Ce, some parameters and process conditions in the LF refining and rolling processes are preferably adopted as follows.

[0037] As an optional embodiment of the method for manufacturing the Ce-containing stainless steel plate of the present invention, the Ce-containing alloy is added in the following manner: slag holes are blown out in the slag, and then the Ce-containing alloy is added from the slag holes;

[0038] The slag eye is where the molten steel rolls. Adding alloy here is more conducive to melting and evenly stirring the Ce alloy.

[0039] As an optional embodiment of the method for manufacturing a Ce-containing stainless steel plate of the present invention, the amount of Ce-containing alloy added is calculated according to a ratio of 20-30 wt% (e.g., 22%, 24%, 26%, 28%) of Ce yield in the stainless steel plate;

[0040] As an optional embodiment of the method for manufacturing a Ce-containing stainless steel plate of the present invention, the rolling is hot rolling.

[0041] The method of adding rare earth iron alloy into the slag eye position during the refining soft blowing process of the present invention can realize the efficient addition of rare earth into stainless steel.

[0042] As an optional embodiment of the method for manufacturing Ce-containing stainless steel plates, the Ce-containing alloy is added 15-25 minutes (eg, 18 minutes, 20 minutes, 22 minutes, 24 minutes) after the start of LF refining.

[0043] The addition time of Ce alloy after the start of LF refining can effectively ensure the removal of inclusions.

[0044] As an optional implementation of the method for manufacturing a stainless steel plate containing Ce, the Ce-containing alloy is 20CeFe (the mass percentage of Ce in the alloy is 20%).

[0045] The Ce-containing alloy used in the present invention is not limited to 20CeFe, and other Ce-containing alloys can also be used as long as they can meet the Ce content of the stainless steel plate.

[0046] As an optional implementation of the method for manufacturing a Ce-containing stainless steel plate, the total time of the LF refining is 35-50 minutes.

[0047] As an optional implementation of the method for manufacturing Ce-containing stainless steel plates, the soft blowing is continued for 15-20 minutes (for example, 16 minutes, 17 minutes, 18 minutes, 19 minutes) after the Ce-containing alloy is added.

[0048] The selection of the soft blowing time of the present invention is related to the residual condition of inclusions in the steel plate. If the time is too short, the reaction is not sufficient; if the time is too long, the production time is delayed.

[0049] In an embodiment of the present invention, the continuous casting process may include: lifting molten steel at LF furnace temperature to a continuous casting machine, performing the continuous casting in a straight arc slab continuous casting machine, controlling the billet pulling speed to 1.1-1.24 m / min, the secondary cooling water ratio to 0.3-0.4 L / kg, the start pouring temperature to 1540-1560° C., and the tundish temperature fluctuation to ±5° C.; using double slag technology, controlling the submerged nozzle centering deviation to less than 3 mm, and the insertion depth to 130-145 mm; designing the protective slag composition, adjusting the crystallizer cooling water flow and temperature, controlling the narrow side copper plate taper, and using a non-sinusoidal vibration curve; setting the number and gap of the foot rollers; and obtaining a billet with a thickness of 180-200 mm after continuous casting.

[0050] In an embodiment of the present invention, the rolling process is as follows: the steel billet after continuous casting is cut and then hot-sent to a hot rolling heating furnace, and the time in the furnace is controlled at 100-150 minutes; the temperature of the steel billet when it is extracted is controlled at 1210-1225°C; after the steel billet is extracted, high-pressure water dephosphorization is performed after the furnace, and the start rolling temperature of rough rolling and finishing rolling is controlled; and multiple rolling passes are implemented to achieve the target thickness.

[0051] The Ce-containing stainless steel plate of the first aspect and the Ce-containing stainless steel plate obtained by the manufacturing method of the second aspect have a grain size of 6.4-6.6, a transverse tensile strength of 1040-1052 MPa, an impact absorption energy of 90-102 J, a corrosion weight loss rate of 0.038-0.05 g·m-2·day-1, and a breakdown potential of 140-147.6 mV.

[0052] The present invention will be described in further detail below in conjunction with specific examples and comparative examples. The production processes and conditions not described in the following examples and comparative examples are conventional processes and conditions, and the production processes and conditions not described in the various examples and comparative examples are the same.

[0053] Example

[0054] (1) Smelting

[0055] Primary slag removal: slag removal is carried out after adding molten iron, slag-making agent and ferrochrome into the AOD furnace;

[0056] Adding ferromanganese: add slagging agent after slagging, and add 40kg / t high carbon ferromanganese at 1600-1630℃;

[0057] Decarburization and manganese preservation: Control the decarburization temperature at 1630-1685°C. As the decarburization temperature increases, reduce the proportion of oxygen in the decarburization gas. Decarburization is terminated when the carbon content in the molten steel is less than 0.1wt%.

[0058] Add copper: Add copper in the middle stage of oxidation, the addition amount is 0.2kg / t.

[0059] Reduction: Add reducing agent and slag-forming agent, blow, tap, test the temperature and composition of molten steel, blow and tap after argon gas;

[0060] (2) LF refining

[0061] 75-85 tons of molten steel is refined in an LF refining furnace. At the beginning of refining, when the temperature of the molten steel is about 1450℃, 35kg of ferrosilicon alloy is added. After melting for 15 minutes, samples are taken for analysis. Then, 10-15kg of 20CeFe is added to the slag eye and soft blowing is performed (Ce target content 37ppm). After 20 minutes of soft blowing, the steel is taken out of the refining furnace at a temperature of 1530℃.

[0062] (3) Continuous casting

[0063] The molten steel at the LF furnace temperature is hoisted to the continuous casting, which is carried out in a straight arc slab continuous casting machine. The pulling speed of the steel billet is controlled at 1.1-1.24m / min, the secondary cooling water ratio is 0.3-0.4L / kg, the start casting temperature is controlled at 1540-1560℃, and the temperature fluctuation of the tundish is ±5℃. The double slag technology is used to control the centering deviation of the immersed water nozzle to be less than 3mm, and the insertion depth is 130-145mm. The protective slag composition is designed, the flow rate and temperature of the crystallizer cooling water are adjusted, the taper of the narrow edge copper plate is controlled, and a non-sinusoidal vibration curve is used. The number and gap of the foot rollers are set to obtain a steel billet with a thickness of 180-200mm after continuous casting.

[0064] (4) Rolling

[0065] The continuous casting billet is cut and then sent hot to the hot rolling heating furnace, and the time in the furnace is controlled at 100-150 minutes; the billet extraction temperature is controlled at 1210-1220℃; after the billet is extracted, it is dephosphorized with high-pressure water after the furnace, and the start rolling temperature of rough rolling and finishing rolling is controlled; multiple rolling passes are implemented to hot roll into steel plates with a thickness of 2.4mm.

[0066] The composition of the steel plate is as follows in mass proportion: C: 0.153%, Si: 0.33%, Mn: 9.10%, P: 0.044%, S: 0.002%, Cr: 13.01%, Ni: 1.11%, Cu: 0.207%, N: 0.163%, Ce: 37ppm, and the rest is Fe and unavoidable impurities.

[0067] Comparative Example 1

[0068] The only difference between this comparative example and the embodiment is that the target Ce content is 0 ppm, that is, no Ce alloy is added.

[0069] The composition of the steel plate is as follows in percentage by mass: C: 0.155%, Si: 0.33%, Mn: 9.12%, P: 0.046%, S: 0.002%, Cr: 13.05%, Ni: 1.15%, Cu: 0.208%, N: 0.160%, Ce: 0 ppm, and the rest is Fe and unavoidable impurities.

[0070] Comparative Example 2

[0071] The only difference between this comparative example and the embodiment is that after adding 20% ​​CeFe, the target Ce content is 61 ppm.

[0072] The composition of the steel plate is as follows in percentage by mass: C: 0.150%, Si: 0.35%, Mn: 9.10%, P: 0.040%, S: 0.002%, Cr: 13.08%, Ni: 1.17%, Cu: 0.206%, N: 0.160%, Ce: 61 ppm, and the rest is Fe and unavoidable impurities.

[0073] The steel plates prepared in the above examples and comparative examples were subjected to performance tests. The specific performance test methods are as follows:

[0074] (1) Organizational analysis

[0075] The hot-rolled stainless steel plate samples with different Ce contents produced in the examples and comparative examples were mounted, polished, and etched, and then the grain sizes of the samples were rated.

[0076] (2) Corrosion resistance analysis

[0077] Hot-rolled stainless steel plates with varying cerium contents, prepared in the Examples and Comparative Examples, were subjected to corrosion weight loss rate tests. Referring to GB / T 17897-2016, the corrosion weight loss tests were conducted in a 6% FeCl₃ aqueous solution in a constant-temperature water bath at 22°C. During the experiments, samples were removed from the solution after immersion for 2, 4, 6, 12, 24, and 48 hours. Corrosion products on the sample surfaces were removed using a rust removal solution composed of 200ml hydrochloric acid, 200ml deionized water, and 4g hexamethylenetetramine. The samples were then dried with hot air and weighed using a 0.0001g precision balance. The corrosion morphology of the samples was photographed and compared to determine the corrosion weight loss rates of the samples with varying cerium contents.

[0078] Electrochemical experiments were conducted using a CS350 electrochemical workstation. During the electrochemical tests, the samples were completely immersed in the solution. Electrochemical impedance spectroscopy and potentiodynamic polarization curves were measured using a 3.5% NaCl solution, while potentiostatic polarization curves were measured using a 0.1 mol / L NaCl solution. Open-circuit potential measurements were performed for 30 minutes at room temperature on hot-rolled stainless steel samples with varying cerium contents. Open-circuit potential measurements were stopped once the open-circuit potential stabilized, providing a reference potential for subsequent electrochemical impedance spectroscopy, potentiodynamic polarization curves, and potentiostatic polarization curves.

[0079] (3) Mechanical properties analysis

[0080] The non-proportional elongation test of the specimen refers to GBT 2975-2018 "Sampling location and specimen preparation for mechanical properties tests of steel and steel products".

[0081] The sample thickness is less than 3mm, and the specific dimensions are as follows:

[0082]

[0083] The samples passed the Rp0.2mm and Rp0.1mm tests (Rp0.2 / Rp0.1 refers to the stress values ​​corresponding to when the non-proportional elongation (plastic deformation part) of the sample reaches 0.2% / 0.1% in the tensile test). It can be seen that when different Ce contents are added, the stress value first increases with the increase of Ce content, and after reaching about 37ppm, it decreases with the increase of Ce content.

[0084] According to the Metallic Materials—Shapeb Pendulum Impact Test Method, the samples were processed into V-notch specimens and impacted using a JBW-300B impact testing machine at room temperature. The impact absorption energy at 25°C of stainless steel samples with different cerium contents was recorded.

[0085] The tensile specimens were processed according to the "Metallic Materials—Tensile Test: Room Temperature Test Method" and stretched using a DNS-200 electronic universal testing machine at room temperature with a tensile strain rate of 0.005s.-1 , the tensile strength of stainless steel samples with different cerium contents was determined.

[0086] The grain size and performance test results of the steel plates obtained in the examples and comparative examples are shown in Tables 1-4 and Attached Figure 1-7 .

[0087] Table 1 Salt spray corrosion test results of the embodiments of the present invention and the comparative examples

[0088]

[0089] Table 2: Electrochemical corrosion test results of the present invention and comparative examples

[0090] Pitting potential (V) Example 147.6 Comparative Example 1 128.1 Comparative Example 2 117.3

[0091] Table 3: Grain size test results of the embodiments of the present invention and the comparative examples

[0092] Grain size grade Example 6.6 Comparative Example 1 6.0 Comparative Example 2 6.3

[0093] Table 4: Impact absorption test results of the embodiments of the present invention and the comparative examples

[0094] Impact absorption energy (J) Example 102 Comparative Example 1 85 Comparative Example 2 79

[0095] (1) From the attached Figure 1 and attached Figure 2 It can be seen that as the cerium content increases from 0 ppm to 37 ppm, the corrosion weight loss rate of stainless steel increases from 0.078 g·m -2 day -1 Reduced to 0.038 g·m -2 day -1 The breakdown potential of the hot-rolled stainless steel plate increased from 128.1mV to 147.6mV. Then, when the cerium content further increased to 61ppm, the corrosion weight loss rate of the stainless steel increased to 0.054g·m -2 day -1 , the breakdown potential of the stainless steel hot-rolled plate is reduced to 117.3mV, and when the cerium content is 37ppm, the corrosion resistance of the stainless steel hot-rolled plate is the best.

[0096] (2) From the attachment Figure 3 and attached Figure 4 It can be seen that adding rare earth cerium to stainless steel can refine the grain size of stainless steel hot-rolled plates. As the Ce content in the steel increases from 0 ppm to 61 ppm, the grain size grade of the stainless steel first increases from 6.0 to 6.6 and then decreases to 6.3.

[0097] (3) From the attachment Figure 5It can be seen that as the cerium content increases from 0 ppm to 61 ppm, the transverse prescribed plastic elongation strength Rp0.2 mm and Rp1.0 mm of the stainless steel hot-rolled plate first increases from 419 MPa and 497 MPa to 500 MPa and 587 MPa, respectively, and then decreases to 464 MPa and 537 MPa, respectively.

[0098] From the attached Figure 6 As can be seen, as the cerium content increases from 0 ppm to 61 ppm, the transverse tensile strength of the hot-rolled stainless steel sheet first increases from 1027 MPa to 1052 MPa, and then decreases to 1016 MPa. Adding rare earth cerium to stainless steel can improve the tensile properties of hot-rolled stainless steel sheet, and the tensile properties of stainless steel are optimal when the cerium content is 37 ppm.

[0099] (4) From the attachment Figure 7 It can be seen that as the cerium content increases from 0 ppm to 37 ppm, the impact absorption energy of stainless steel increases from 85 J to 102 J, and then as the cerium content further increases, the impact absorption energy of stainless steel decreases to 84 J.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A stainless steel plate containing Ce, characterized in that: The composition of the stainless steel plate is as follows by mass ratio: C: 0.13%-0.163%, Si: 0.33%-0.57%, Mn: 8.13%-9.26%, P: ≤0.049%, S: ≤0.002%, Cr: 13.01%-13.27%, Ni: 1.11%-1.24%, Cu: 0.20%-0.218%, N: 0.137%-0.163%, Ce: 20-50ppm, and the balance is Fe and unavoidable impurities; Preferably, the Ce content is 20-45 ppm, more preferably 30-45 ppm; The thickness of the stainless steel plate is 2-3 mm.

2. A method for manufacturing a stainless steel plate containing Ce as claimed in claim 1, characterized in that: include: The process comprises the following steps: smelting, LF refining, continuous casting and rolling. In the LF refining, ferrosilicon is added for smelting and sampling and analysis, and then a Ce-containing alloy is added, and soft blowing is performed immediately after the Ce-containing alloy is added. Ferrosilicon is added at the initial stage of the LF refining, and the temperature of the molten steel is 1455-1545° C. when the ferrosilicon is added. The tapping temperature of the LF refining is 1520-1535° C.

3. The method for manufacturing a Ce-containing stainless steel sheet according to claim 2, wherein: The Ce-containing alloy is added in the following manner: a slag eye is blown out in the slag, and then the Ce-containing alloy is added from the slag eye.

4. The method for manufacturing a Ce-containing stainless steel sheet according to claim 2, wherein: The amount of the Ce-containing alloy added is calculated based on the Ce yield in the stainless steel plate being 20-30 wt %.

5. The method for manufacturing a Ce-containing stainless steel sheet according to claim 2, wherein: The rolling is hot rolling.

6. The method for manufacturing a Ce-containing stainless steel sheet according to claim 2, wherein: The Ce-containing alloy is added 15-25 minutes after the start of LF refining.

7. The method for manufacturing a Ce-containing stainless steel sheet according to claim 2, wherein: The Ce-containing alloy is 20CeFe.

8. The method for manufacturing a Ce-containing stainless steel sheet according to claim 2, wherein: The total time of the LF refining is 35 min to 50 min.

9. The method for manufacturing a Ce-containing stainless steel sheet according to claim 2, wherein: After the Ce-containing alloy is added, soft blowing is continued for 15-20 minutes.

10. The Ce-containing stainless steel sheet according to claim 1 or the Ce-containing stainless steel sheet manufactured by the manufacturing method according to any one of claims 2 to 9, characterized in that: The stainless steel plate has a grain size of 6.4-6.6, a transverse tensile strength of 1040-1052 MPa, an impact absorption energy of 90-102 J, and a corrosion weight loss rate of 0.038-0.05 g·m -2 day -1 , breakdown potential 140-147.6mV.

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