CN114075640A - High-corrosion-resistance austenitic stainless steel and manufacturing method thereof - Google Patents

High-corrosion-resistance austenitic stainless steel and manufacturing method thereof Download PDF

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Publication number
CN114075640A
CN114075640A CN202010814407.3A CN202010814407A CN114075640A CN 114075640 A CN114075640 A CN 114075640A CN 202010814407 A CN202010814407 A CN 202010814407A CN 114075640 A CN114075640 A CN 114075640A
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stainless steel
austenitic stainless
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equal
corrosion
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余式昌
欧新哲
徐松乾
马天军
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Baowu Special Metallurgy Co Ltd
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Baowu Special Metallurgy Co Ltd
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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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • 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
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten

Abstract

The invention belongs to the field of stainless steel materials, and relates to high-corrosion-resistance austenitic stainless steel and a manufacturing method thereof, wherein the stainless steel comprises the following chemical components in percentage by weight: c: less than or equal to 0.020, Si: less than or equal to 0.5, Mn: 2.0 or less, P: 0.025 or less, S: less than or equal to 0.010, Ni: 21.5 to 23.5, Cr: 22.0 to 24.0, Mo: 5.0-6.0, N: 0.25 to 0.35, Cu: 0.5 to 1.5, W: less than or equal to 1.0, the balance of Fe and inevitable impurities, and the PREN value is more than or equal to 45(PREN ═ Cr% +3.3 Mo% + 16N%). The high corrosion resistant austenitic stainless steel plate has reasonable control on Mo and N content, has better manufacturability, has excellent corrosion resistance, and can be applied to the preparation of equipment for harsh corrosion environments such as energy chemical industry, waste gas treatment, petroleum refining and the like.

Description

High-corrosion-resistance austenitic stainless steel and manufacturing method thereof
Technical Field
The invention belongs to the field of stainless steel materials, relates to high-corrosion-resistance austenitic stainless steel, and particularly relates to an austenitic stainless steel hot rolled plate and coil with excellent corrosion resistance and a manufacturing method thereof.
Background
With the rapid development of modern industry, in order to further improve the production efficiency, reduce the energy consumption and meet the environmental protection requirement, the equipment of modern industry, especially the industries of energy chemical industry, waste gas treatment, petroleum refining and the like, has more and more strict working conditions, and the requirements on the corrosion resistance and the service life of materials are all higher.
At present, 300 series of widely used austenitic stainless steels at home and abroad are taken as the main materials, the steel types have good comprehensive performance and cost performance, but the corrosion resistance of the steel types is poor, and the steel types can not be applied to severe corrosion environments, so that the super austenitic stainless steel with higher Cr, Mo, Ni and N contents is rapidly developed, in the conventional high-corrosion-resistance austenitic stainless steel, the content of Mo in steel types such as super austenitic N08367 and the like which meet the PREN index of more than or equal to 45 is higher, and the plasticity during hot working is poor due to the easy segregation of the Mo content.
Application number 201810640765.X discloses high-strength and high-corrosion-resistance austenitic stainless steel, which is characterized in that: the raw materials of the austenitic stainless steel comprise, by mass, not more than 0.1% of C, not more than 2% of Si, not more than 7% of Mn, not more than 0.1% of S, not more than 0.1% of P, and Cr: 28-35%, Ni: 26-32%, Mo: 3-8%, N: 0.2-0.5%, the balance of Fe and inevitable impurities, Ni/Mn is more than or equal to 4, and PREN (Cr +3.3 Mo + 16N) is more than or equal to 43. The steel grade obtains a solid solution state austenite structure with higher dislocation density by selecting high Cr, high Mo, high N and high Ni contents, and realizes the great improvement of the strength of austenitic stainless steel. The steel grade has high alloy content, so that the production cost is high, and in addition, the manufacturing difficulty is increased sharply due to high Mo and high N.
Application No. 201610938389.3 relates to a method for producing a high corrosion resistance high nitrogen super austenitic stainless steel, the smelting target austenitic stainless steel comprises the following components: c: less than or equal to 0.02%, Si: less than or equal to 0.5 percent, Mn: 2.0-4.0%, Cr: 24.0 to 25.0%, Ni: 21.0 to 23.0%, Mo: 7.0-8.0%, Cu: 0.3-0.6%, N: 0.45-0.55%, S: less than or equal to 0.005%, P: less than or equal to 0.03%, Fe: and (4) the balance. The chemical components related to the invention are high Mo and high N S32654, the manufacturing method is a method for producing high corrosion resistance high nitrogen super austenitic stainless steel by blowing nitrogen gas at the bottom of a vacuum induction furnace, and the components and the manufacturing method are not covered by the alloy.
The invention describes high-corrosion-resistance austenitic stainless steel with better manufacturability, which can be applied to equipment for preparing harsh corrosion environments such as energy chemical industry, waste gas treatment, petroleum refining and the like.
Disclosure of Invention
The invention aims to provide high-corrosion-resistance austenitic stainless steel and a manufacturing method thereof, so that the material has better manufacturability and excellent corrosion resistance.
The technical scheme of the invention is as follows:
the chemical components (weight percentage) of the high corrosion resistant austenitic stainless steel are as follows: c: less than or equal to 0.020, Si: less than or equal to 0.5, Mn: 2.0 or less, P: 0.025 or less, S: less than or equal to 0.010, Ni: 21.5 to 23.5, Cr: 22.0 to 24.0, Mo: 5.0-6.0, N: 0.25 to 0.35, Cu: 0.5 to 1.5, W: less than or equal to 1.0, the balance of Fe and inevitable impurities, and the PREN value is more than or equal to 45(PREN ═ Cr% +3.3 Mo% + 16N%).
According to the high corrosion resistant austenitic stainless steel, the weight percentage wt% of Cr is preferably 22.5-23.5.
According to the high-corrosion-resistance austenitic stainless steel, the weight percentage wt% of Mo is more preferably 5.2-5.8.
According to the high-corrosion-resistance austenitic stainless steel, the weight percentage wt% of N is further preferably 0.27-0.32.
According to the high corrosion resistant austenitic stainless steel, the weight percentage wt% of Cu is preferably 0.7-1.2; the weight percentage of W is less than or equal to 0.8.
According to the high corrosion resistant austenitic stainless steel, the weight percentage of P is more than or equal to 0.020; the weight percentage of S is less than or equal to 0.005; the weight percentage wt% of Ni is 22.0-23.0.
The chemical components (weight percentage) of the high corrosion resistant austenitic stainless steel are as follows more preferably: c: 0.015 or less, Si: less than or equal to 0.35, Mn: 1.0 or less, P: less than or equal to 0.020, S: 0.005 or less, Ni: 22.0-23.0, Cr: 22.5 to 23.5, Mo: 5.2-5.8, N: 0.27 to 0.32, Cu: 0.7 to 1.2, W: not more than 0.8, the balance of Fe and inevitable impurities, and the PREN value is not less than 45(PREN ═ Cr% +3.3 Mo% + 16N%).
The invention also provides a manufacturing method of the high corrosion resistant austenitic stainless steel, and also provides a method for manufacturing the austenitic stainless steel hot rolled plate and coil with better manufacturability and excellent corrosion resistance, and the method comprises the following steps:
according to the requirements of the chemical components, smelting in a mode of an EAF (electric furnace), an AOD (argon oxygen decarburization furnace) and an LF (ladle refining furnace), and continuously casting or die casting a flat ingot, wherein the superheat degree of continuous casting is controlled to be less than 50 ℃;
putting a continuous casting slab or a die casting slab ingot into a stepping heating furnace for heating, controlling the heating temperature to 1150-1250 ℃, and carrying out hot rolling on a rolling mill to form a plate and a coil with required specifications, wherein the final rolling temperature is controlled to 900-1000 ℃; and (3) carrying out solution treatment on the hot rolled plate and the coil, controlling the temperature of the solution treatment at 1100-1200 ℃, and finally carrying out acid pickling to obtain a finished product of the high-corrosion-resistance austenitic stainless steel hot rolled plate and coil.
The pitting corrosion rate (g/cm2) of the high-corrosion-resistance austenitic stainless steel is less than 0.0001, and the hot rolling edge crack is less than 5 mm.
The invention also provides application of the high-corrosion-resistance austenitic stainless steel in preparation of equipment for harsh corrosion environments such as energy chemical industry, waste gas treatment, petroleum refining and the like.
The reason for determining the chemical components in the technical scheme of the invention is as follows:
carbon: is a strong austenite forming element and can improve the strength of steel. When the carbon content is too high, the corrosion performance and the toughness are obviously reduced, and the difficulty and the cost in the preparation process are increased by the too low carbon content, so that the carbon content is preferably less than or equal to 0.020%.
Silicon: is ferrite forming element and can be effectively used as deoxidizer, but the excessive addition can reduce the corrosion resistance of the alloy and deteriorate the processing and toughness, so the addition of silicon is controlled to be less than or equal to 0.5 percent.
Manganese: is a weak austenite element, plays a role in stabilizing austenite, and in addition, the addition of manganese can obviously improve the solubility of nitrogen. Too high manganese is not good for corrosion resistance, so the manganese content should be controlled to be less than or equal to 2.0%.
Phosphorus: is an impurity element in the steel, and the lower the content of the impurity element is, the better the thermoplasticity and the corrosion resistance are considered, but the lower the control can cause higher cost, so the phosphorus is controlled to be less than or equal to 0.025 percent.
Sulfur: is an impurity element in the steel, and the content of the impurity element is better from the viewpoint of thermoplasticity and corrosion resistance, so that the content of sulfur is controlled to be less than or equal to 0.010 percent.
Chromium: the important element for improving the corrosion resistance can improve the corrosion resistance of the stainless steel in oxidizing acid and improve the local corrosion resistance of the stainless steel in chloride solution, such as stress corrosion resistance, pitting corrosion resistance, crevice corrosion resistance and the like. If the amount is too low, the corrosion resistance is poor, and the solubility of nitrogen is not favorable, but if the amount is too high, the tendency of ferrite and intermetallic compounds to precipitate increases, and therefore, it is preferably 22.0 to 24.0%.
Nickel: as an element for strongly forming and expanding an austenite region, the stability of an austenite structure can be improved, the nonmagnetic property is favorably ensured, the hot workability is improved, the nickel has better effects of improving the uniform corrosion and stress corrosion cracking resistance sensitivity in an oxidation and reduction medium, but the price of the nickel is higher, so the content of the nickel is preferably controlled to be 21.5-23.5%.
Molybdenum: the element is ferrite-forming element, which can improve the high-temperature strength and the corrosion resistance of the alloy, especially in the case of the complex action with chromium, the pitting corrosion resistance equivalent is 3.3 times of that of chromium, but too high is easy to aggravate segregation and influence thermoplasticity, and the price of molybdenum is high, so the element is preferably controlled to be 5.0-6.0%.
Copper: elements that improve corrosion resistance are particularly advantageous in the environment of reducing acids. However, the copper content is preferably controlled to 0.5 to 1.5% because it is not preferable to improve the strength of the material and to lower the hot workability of the steel.
Tungsten: the corrosion resistance and strength of the steel can be improved. However, when the content of tungsten is too high, the intermetallic phase is promoted to be generated, and the cost is high, so that the addition of tungsten is controlled to be less than or equal to 1.0 percent.
Nitrogen: the nitrogen is a strong austenite forming element, the austenite forming capacity of the nitrogen is far higher than that of nickel, the nitrogen is beneficial to stabilizing an austenite phase and improving high-temperature strength, the nitrogen can replace Ni to obviously reduce the cost, and secondly, the nitrogen can improve the corrosion resistance of the austenite phase, especially the pitting corrosion resistance and the crevice corrosion resistance, but the too high nitrogen can cause smelting difficulty, increase the risk of nitride formation and reduce the toughness and the corrosion resistance of the material, so the nitrogen is preferably controlled to be 0.25-0.35%.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following characteristics and positive effects:
chromium, molybdenum and nitrogen are important elements for improving the corrosion resistance of austenitic stainless steel, the high chromium content is controlled to be 22.0-24.0% and the high nitrogen content is controlled to be 0.25-0.35%, the molybdenum content is properly reduced to be 5.0-6.0%, the segregation degree of a smelting ingot is reduced due to the low molybdenum content while the high PREN value is larger than or equal to 45, in addition, the proper copper and tungsten content is controlled, the corrosion resistance under a severe environment is favorably improved, the low phosphorus and sulfur content and the proper nickel content are controlled, and the good hot working plasticity is favorably obtained, so the austenitic stainless steel has excellent corrosion resistance, the manufacturability is better, and the manufacturing cost is reduced.
The high corrosion resistant austenitic stainless steel can be produced in batch by using an alloy plate strip production line, and the specific preparation method comprises the following steps:
1. smelting in the modes of an EAF (electric furnace), an AOD (argon oxygen decarburization furnace) and an LF (ladle refining furnace), continuously casting or die casting a flat ingot, and controlling the superheat degree of continuous casting to be less than 50 ℃;
2. putting a continuous casting billet or a die casting slab ingot into a stepping heating furnace for heating, controlling the heating temperature to 1150-1250 ℃, hot-rolling the continuous casting billet or the die casting slab ingot into a plate or a coil with required specification on a rolling mill, controlling different controlled rolling processes according to different plate thicknesses, controlling the final rolling temperature to 900-1000 ℃, and ensuring that the high molybdenum phase of the steel is eliminated, good hot-working thermoplasticity is kept and good hot-rolled plate or coil shape is controlled by controlling proper heating temperature and final rolling temperature;
3. and (3) carrying out solution treatment on the hot rolled plate and the hot rolled coil, controlling the solution treatment temperature to be 1100-1200 ℃, enabling the hot rolled plate and the hot rolled coil to obtain a good recrystallization structure in the temperature range, reasonably matching indexes such as strength, plasticity, corrosion resistance and the like, and finally carrying out acid pickling to obtain a finished product of the heat-resistant austenitic stainless steel hot rolled plate and the heat-resistant austenitic stainless steel coil.
Due to reasonable chemical component design and proper controlled rolling process, the produced austenitic stainless steel plate and the produced austenitic stainless steel coil product have excellent corrosion resistance, so that the austenitic stainless steel coil can be applied to equipment for preparing harsh corrosion environments such as energy chemical industry, waste gas treatment, petroleum refining and the like.
In summary, the highly corrosion-resistant austenitic stainless steel provided by the invention is provided according to the above reasons, and the highly corrosion-resistant austenitic stainless steel has good manufacturability through chemical composition design and manufacturing process control, can produce hot rolled plates and coils with excellent corrosion resistance, and can be applied to equipment for preparing severe corrosion environment applications such as energy chemical industry, waste gas treatment, petroleum refining and the like.
Detailed Description
The technical solutions of the present invention are further illustrated below with reference to specific examples, and it should be clear that these examples are only used for describing the specific embodiments of the present invention, and are not intended to limit the scope of the present invention in any way.
Table 1 shows the composition of example steels of the present invention and comparative steels, the balance being iron. Table 2 shows the properties of the example steels of the present invention and the comparative example steels.
Table 1 example and comparative example ingredients, balance iron (wt.%)
Patent application C Si Mn P S Cr Ni Mo N Cu W PREN
Example 1 0.018 0.25 0.66 0.022 0.001 22.1 21.9 5.4 0.33 0.70 0.7 45.20
Example 2 0.015 0.35 0.45 0.019 0.001 22.6 22.8 5.7 0.28 0.58 0.1 45.89
Example 3 0.016 0.31 0.53 0.020 0.001 23.5 22.2 5.1 0.34 1.23 0.5 45.77
Example 4 0.013 0.38 0.89 0.017 0.001 23.9 21.6 5.3 0.31 1.40 0.2 46.35
Example 5 0.017 0.22 0.71 0.021 0.001 23.0 23.3 5.9 0.26 0.96 0.4 46.63
Comparative example 1 0.020 0.35 0.52 0.022 0.001 20.4 24.6 6.7 0.19 0.43 - 45.55
Example 1
The components of the high corrosion resistant austenitic stainless steel according to the present invention are listed in table 1, and the specific preparation method comprises:
1. smelting by adopting the modes of an EAF (electric furnace), an AOD (argon oxygen decarburization furnace) and an LF (ladle refining furnace), continuously casting a continuous casting billet with the thickness of 200mm, and controlling the superheat degree of the continuous casting to be less than 50 ℃;
2. putting the continuous casting slab into a stepping heating furnace for heating, controlling the heating temperature to 1190 ℃, hot rolling the continuous casting slab on a rolling mill into a 15mm hot rolled plate, and controlling the final rolling temperature to 950 ℃;
3. and (3) carrying out solution treatment on the hot rolled plate, controlling the temperature of the solution treatment to be 1150 ℃, and finally carrying out acid pickling to obtain a high-corrosion-resistance austenitic stainless steel hot rolled plate finished product, wherein the product performance is shown in Table 2.
Example 2
The components of the high corrosion resistant austenitic stainless steel according to the present invention are listed in table 1, and the specific preparation method comprises:
1. smelting by adopting the modes of an EAF (electric furnace), an AOD (argon oxygen decarburization furnace) and an LF (ladle refining furnace), continuously casting a continuous casting billet with the thickness of 200mm, and controlling the superheat degree of the continuous casting to be less than 50 ℃;
2. putting the continuous casting slab into a stepping heating furnace for heating, controlling the heating temperature to be 1210 ℃, hot rolling the continuous casting slab on a rolling mill to be 20mm, and controlling the finish rolling temperature to be 970 ℃;
3. and carrying out solution treatment on the hot rolled plate, controlling the temperature of the solution treatment to 1170 ℃, and finally carrying out acid pickling to obtain a high-corrosion-resistance austenitic stainless steel hot rolled plate finished product, wherein the product performance is shown in Table 2.
Example 3
The components of the high corrosion resistant austenitic stainless steel according to the present invention are listed in table 1, and the specific preparation method comprises:
1. smelting by adopting the modes of an EAF (electric furnace), an AOD (argon oxygen decarburization furnace) and an LF (ladle refining furnace), and die-casting a 290mm flat ingot;
2. putting the die casting slab ingot into a stepping heating furnace for heating, controlling the heating temperature to be 1230 ℃, hot rolling the die casting slab ingot on a rolling mill to form a hot rolled plate with the thickness of 30mm, and controlling the final rolling temperature to be 990 ℃;
3. and (3) carrying out solution treatment on the hot rolled plate, controlling the temperature of the solution treatment to be 1190 ℃, and finally carrying out acid pickling to obtain a high-corrosion-resistance austenitic stainless steel hot rolled plate finished product, wherein the product performance is shown in table 2.
Example 4
The components of the high corrosion resistant austenitic stainless steel according to the present invention are listed in table 1, and the specific preparation method comprises:
1. in the embodiment, the method comprises the steps of smelting by adopting an EAF (electric furnace), an AOD (argon oxygen decarburization) and an LF (ladle refining furnace), continuously casting a 150mm continuous casting billet, and controlling the superheat degree of the continuous casting to be less than 50 ℃;
2. putting the continuous casting slab into a stepping heating furnace for heating, controlling the heating temperature at 1190 ℃, and carrying out hot rolling on a rolling mill to obtain a 6mm hot rolled coil, wherein the final rolling temperature is controlled at 920 ℃;
3. and (3) carrying out solution treatment on the hot-rolled coil, controlling the temperature of the solution treatment to 1150 ℃, and finally carrying out acid pickling to obtain a finished product of the high-corrosion-resistance austenitic stainless steel hot-rolled coil, wherein the product performance is shown in Table 2.
Example 5
The components of the high corrosion resistant austenitic stainless steel according to the present invention are listed in table 1, and the specific preparation method comprises:
1. in the embodiment, the method comprises the steps of smelting by adopting an EAF (electric furnace), an AOD (argon oxygen decarburization) and an LF (ladle refining furnace), continuously casting a 150mm continuous casting billet, and controlling the superheat degree of the continuous casting to be less than 50 ℃;
2. putting the continuous casting slab into a stepping heating furnace for heating, controlling the heating temperature at 1160 ℃, and carrying out hot rolling on a rolling mill to obtain a hot rolled plate with the thickness of 10mm, wherein the final rolling temperature is controlled at 950 ℃; and carrying out solution treatment on the hot rolled plate, controlling the temperature of the solution treatment at 1160 ℃, and finally carrying out acid pickling to obtain a high-corrosion-resistance austenitic stainless steel hot rolled plate finished product, wherein the product performance is shown in Table 2.
Comparative example 1
Comparative example 1 is a conventional N08367 super austenitic stainless steel, the production process is the same as in the examples, and the formed components and various properties are shown in tables 1 and 2.
As can be seen from the comparison between tables 1 and 2, compared with the N08367 super austenitic stainless steel of the comparative example 1, the high corrosion resistant austenitic stainless steel of the invention has the advantages that the PREN value of the steel grade of the invention is kept to be more than or equal to 45, the excellent corrosion resistance and the room temperature mechanical property are improved by properly increasing the content of chromium and nitrogen and reducing the content of molybdenum, and meanwhile, the thermoplastic property of the material is obviously improved, so that the hot rolling edge crack degree is reduced, and the manufacturability of the material is improved.
From the comparison, the heat-resistant austenitic stainless steel disclosed by the invention has better manufacturability and excellent high-temperature corrosion resistance, and can be applied to preparation of equipment for harsh corrosion environments such as energy chemical industry, waste gas treatment, petroleum refining and the like.
TABLE 2 comparison of the properties of the examples with those of the comparative examples
Figure BDA0002632160820000071
It should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the present invention.

Claims (9)

1. The high-corrosion-resistance austenitic stainless steel is characterized by comprising the following chemical components in percentage by weight: c: less than or equal to 0.020, Si: less than or equal to 0.5, Mn: 2.0 or less, P: 0.025 or less, S: less than or equal to 0.010, Ni: 21.5 to 23.5, Cr: 22.0 to 24.0, Mo: 5.0-6.0, N: 0.25 to 0.35, Cu: 0.5 to 1.5, W: less than or equal to 1.0, the balance of Fe and inevitable impurities, and the PREN value is more than or equal to 45(PREN ═ Cr% +3.3 Mo% + 16N%).
2. The austenitic stainless steel of claim 1, wherein the weight percentage of Cr is 22.5-23.5.
3. The austenitic stainless steel of claim 1, wherein the weight percentage of Mo is 5.2-5.8.
4. The highly corrosion-resistant austenitic stainless steel of claim 1, wherein the weight percentage of N is 0.27 to 0.32.
5. The highly corrosion-resistant austenitic stainless steel of claim 1, wherein the weight percentage of Cu is 0.7 to 1.2; the weight percentage of W is less than or equal to 0.8.
6. The highly corrosion-resistant austenitic stainless steel of claim 1, wherein the weight percentage of P is 0.020 or less; the weight percentage of S is less than or equal to 0.005; the weight percentage wt% of Ni is 22.0-23.0.
7. The method for manufacturing a highly corrosion-resistant austenitic stainless steel according to claim 1, comprising the steps of:
(1) smelting in the modes of an EAF (electric furnace), an AOD (argon oxygen decarburization furnace) and an LF (ladle refining furnace), continuously casting or die casting a flat ingot, and controlling the superheat degree of continuous casting to be less than 50 ℃;
(2) putting a continuous casting slab or a die casting slab ingot into a stepping heating furnace for heating, controlling the heating temperature to 1150-1250 ℃, hot rolling the continuous casting slab or the die casting slab ingot on a rolling mill into a plate or a coil with required specification, controlling different controlled rolling processes according to different plate thicknesses, and controlling the final rolling temperature to 900-1000 ℃;
(3) and (3) carrying out solution treatment on the hot rolled plate and the coil to control the solution treatment temperature to be 1100-1200 ℃, and finally carrying out acid pickling to obtain a finished product of the heat-resistant austenitic stainless steel hot rolled plate and coil.
8. The highly corrosion-resistant austenitic stainless steel of claim 1 or the stainless steel produced by the method of manufacturing the highly corrosion-resistant austenitic stainless steel of claim 7, wherein the highly corrosion-resistant austenitic stainless steel has a pitting corrosion ratio (g/cm2) <0.0001 and a hot rolling edge crack <5 mm.
9. Use of the highly corrosion-resistant austenitic stainless steel of claim 1 for manufacturing equipment for use in severe corrosive environments such as energy chemical, exhaust gas treatment, petroleum refining, etc.
CN202010814407.3A 2020-08-13 2020-08-13 High-corrosion-resistance austenitic stainless steel and manufacturing method thereof Pending CN114075640A (en)

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