CN114657335B - Super duplex stainless steel and annealing method thereof - Google Patents
Super duplex stainless steel and annealing method thereof Download PDFInfo
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- CN114657335B CN114657335B CN202210339164.1A CN202210339164A CN114657335B CN 114657335 B CN114657335 B CN 114657335B CN 202210339164 A CN202210339164 A CN 202210339164A CN 114657335 B CN114657335 B CN 114657335B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
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- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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Abstract
The invention belongs to the field of development and application of super duplex stainless steel varieties, and relates to super duplex stainless steel and an annealing method thereof. The invention discloses an annealing method of super duplex stainless steel, which comprises the following steps: controlling the heating time according to the cold rolling deformation rate, and heating the super duplex stainless steel to 750-1020 ℃; controlling the heat preservation time according to the cold rolling deformation rate, so that the super duplex stainless steel is subjected to heat preservation at 1020-1100 ℃; and (5) cooling. According to the annealing method of the super duplex stainless steel, provided by the invention, the precipitation characteristics of the harmful phases of the super duplex stainless steel and the influence law of cold rolling deformation on the precipitated phases are combined, and the normal production of the super duplex stainless steel cold coil or cold plate is finally realized by controlling the key process parameters such as the annealing temperature rise, the heat preservation temperature and the time length of the cold coil or cold plate with different cold rolling deformation rates and matching with the corresponding cooling speed, so that the precipitation of the harmful phases in the tissue is avoided.
Description
Technical Field
The invention belongs to the field of development and application of super duplex stainless steel varieties, relates to super duplex stainless steel and an annealing method thereof, and particularly relates to a super duplex stainless steel cold roll or cold plate and an annealing method thereof.
Background
The super duplex stainless steel has austenite and ferrite coexisting in a room temperature structure, and the duplex proportion is close to 1:1, the steel grade has high strength (the yield strength is generally twice that of austenitic stainless steel), good Cl resistance - The corrosion-resistant and corrosion-resistant steel has the outstanding advantages of pitting corrosion resistance, stress corrosion resistance, welding performance and the like, and is widely used in the fields of petrochemical industry, salt production, hydraulic engineering, shipbuilding, civil use and the like.
Compared with the conventional duplex stainless steel S32205, the super duplex stainless steel contains higher Cr and Mo elements, and the phase boundary of the duplex structure and the ferrite phase are more prone to generating precipitation of brittle harmful phases, so that the super duplex stainless steel has great destructive effects on production, manufacture and use.
In the process of manufacturing super duplex stainless steel cold rolls or cold plates, deformation energy increases due to cold deformation of the plate. The higher the deformation ratio, the more the deformation energy increases, the more likely the structure will be to precipitate during annealing. If the product is light, the organization and performance of the product are unqualified, and if the product is heavy, the cold roll can be broken in the production process, so that huge damage and potential safety hazard are brought to the manufacture.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art and provides super duplex stainless steel and an annealing method thereof.
Specifically, the annealing method of the super duplex stainless steel comprises the following steps:
(1) Controlling the heating time according to the cold rolling deformation rate, and heating the super duplex stainless steel to 750-1020 ℃;
(2) Controlling the heat preservation time according to the cold rolling deformation rate, so that the super duplex stainless steel is subjected to heat preservation at 1020-1100 ℃;
(3) And (5) cooling.
According to the annealing method of the super duplex stainless steel, when the cold rolling deformation rate is 0-20%, the heating time is less than or equal to 5min, and the heat preservation time is 3-10min.
According to the annealing method of the super duplex stainless steel, when the cold rolling deformation rate is 21% -30%, the heating time is less than or equal to 3min, and the heat preservation time is 4-10min.
According to the annealing method of the super duplex stainless steel, when the cold rolling deformation rate is 31% -50%, the heating time is less than or equal to 2min, and the heat preservation time is 5-10min.
According to the annealing method of the super duplex stainless steel, when the cold rolling deformation rate is 51% -70%, the heating time is less than or equal to 1min, and the heat preservation time is 5-10min.
According to the annealing method of the super duplex stainless steel, the cooling speed is 150-500 ℃/s, and the cooling time is 1-5s.
According to the annealing method of the super duplex stainless steel, the thickness of the super duplex stainless steel is 0.5-4.0mm.
According to the annealing method of the super duplex stainless steel, the super duplex stainless steel is a cold coil or a cold plate of S32750 or S32760.
On the other hand, the invention also provides the super duplex stainless steel, which is annealed by adopting the annealing method in the preparation process.
The technical scheme of the invention has the following beneficial effects:
(1) According to the annealing method of the super duplex stainless steel, provided by the invention, by combining the precipitation characteristics of the harmful phase of the super duplex stainless steel and the influence rule of cold rolling deformation on the precipitated phase, through controlling key process parameters such as annealing temperature rise, heat preservation temperature and time length of cold rolls or cold plates with different cold rolling deformation rates, and matching with corresponding cooling speeds, the precipitation of the harmful phase in a tissue is avoided, and the normal production of the super duplex stainless steel cold rolls or cold plates is finally realized;
(2) The annealing method of the super duplex stainless steel solves the problem that precipitated phases exist in the super duplex stainless steel cold coil or cold plate tissue, ensures normal production on site, ensures that the tissue and the performance of the product are qualified, meets the requirements of the domestic high-end corrosion-resistant industry, and replaces import.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
FIG. 1 is a metallographic structure diagram of an original hot coil of the super duplex stainless steel of example 1;
FIG. 2 is a metallographic structure of a super duplex stainless steel cold coil annealed according to the method of example 1;
FIG. 3 is a metallographic structure of a super duplex stainless steel cold coil annealed according to the method of comparative example 1;
FIG. 4 is a metallographic structure of a super duplex stainless steel cold coil annealed according to the method of comparative example 2.
Detailed Description
The present invention will be described in detail with reference to the following embodiments for a full understanding of the objects, features, and effects of the present invention. The process of the present invention is carried out by methods or apparatus conventional in the art, except as described below. The following terms have the meanings commonly understood by those skilled in the art unless otherwise indicated.
The terms "the," "one," and "the" as used herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item. The terms "preferred," "more preferred," and the like refer to embodiments of the invention that may provide certain benefits in certain circumstances. However, other embodiments may be preferred under the same or other circumstances. Furthermore, the recitation of one or more embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.
When a range of values is disclosed herein, the range is considered to be continuous and includes both the minimum and maximum values for the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. Further, when multiple range description features or characteristics are provided, the ranges may be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood to include any and all subranges subsumed therein.
In order to realize safe production of the super duplex stainless steel cold coil or cold plate, ensure that the structure and performance of the product are qualified, provide basic support for the application of the super duplex stainless steel cold coil or cold plate in the high-end corrosion-resistant industry, promote the technical progress and product upgrading of the high-end stainless steel field, and provide the annealing method of the super duplex stainless steel.
Specifically, the annealing method of the super duplex stainless steel comprises the following steps:
(1) Controlling the heating time according to the cold rolling deformation rate, and heating the super duplex stainless steel to 750-1020 ℃;
(2) Controlling the heat preservation time according to the cold rolling deformation rate, so that the super duplex stainless steel is subjected to heat preservation at 1020-1100 ℃;
(3) And (5) cooling.
According to the invention, key technological parameters such as annealing temperature rise, heat preservation temperature and time length of the super duplex stainless steel cold coil or cold plate are respectively controlled according to the difference of cold rolling deformation rate according to the influence of the characteristic of the precipitated phase of the super duplex stainless steel and the cold rolling deformation rate on the precipitated phase, thereby avoiding precipitation of harmful phases in tissues and producing the super duplex stainless steel cold coil or cold plate with qualified tissues and performances on the premise of ensuring production safety.
In some preferred embodiments, the annealing method of the super duplex stainless steel of the present invention comprises:
(1) And controlling the heating time according to the cold rolling deformation rate, and heating the super duplex stainless steel to 750-1020 ℃.
As the deformation energy of the super duplex stainless steel after cold rolling deformation is increased, the precipitation kinetics of harmful phases is increased, and the harmful phases are more easily precipitated in a tissue, therefore, the temperature and the duration of temperature rise are required to be strictly controlled.
Preferably, when the cold rolling deformation rate is 0-20%, the heating duration is less than or equal to 5min.
Further preferably, when the cold rolling deformation rate is 21% -30%, the heating duration is less than or equal to 3min.
Further preferably, when the cold rolling deformation rate is 31% -50%, the heating duration is less than or equal to 2min.
Further preferably, when the cold rolling deformation rate is 51% -70%, the heating duration is less than or equal to 1min.
(2) And controlling the heat preservation time according to the cold rolling deformation rate, so that the super duplex stainless steel is subjected to heat preservation at 1020-1100 ℃.
The temperature and the duration of the heat preservation section are controlled, so that on one hand, the double-phase structure can be guaranteed to be recovered and recrystallized, and on the other hand, trace precipitated phases generated by the temperature rising section can be eliminated.
After practice, when the duration of the heat preservation period is too short, the recovery recrystallization is incomplete; when the length of the heat preservation section is too long, the material is narrowed and thinned greatly, which is not beneficial to the control of the size of the cold coil or the cold plate.
Preferably, when the cold rolling deformation rate is 0-20%, the heat preservation duration is 3-10min.
Further preferably, when the cold rolling deformation rate is 21% -30%, the heat preservation duration is 4-10min.
Further preferably, when the cold rolling deformation rate is 31% -50%, the heat preservation duration is 5-10min.
Further preferably, when the cold rolling deformation rate is 51% -70%, the heat preservation duration is 5-10min.
(3) And (5) cooling.
Preferably, the cooling speed of the super duplex stainless steel is controlled to be 150-500 ℃ per second, and the cooling time is 1-5 seconds. When the cooling time is too slow, a precipitated phase can be generated in the tissue, so that the tissue does not meet the standard requirement; too fast cooling may result in poor plate shape.
Preferably, the super duplex stainless steel is S32750 or S32760, and comprises two types of European standard, american standard and national standard corresponding to the two types of brands.
Wherein, the super duplex stainless steel S32750 comprises, by weight: c: si 0-0.03 wt% less than or equal to 0.8 wt% Mn less than or equal to 1.20 wt% P less than or equal to 0.035 wt% S less than or equal to 0.020 wt% Cr:24.0% -26.0% Ni:6.0% -8.0% mo:3.0% -5.0% n: 0.24-0.32% Cu less than or equal to 0.50% and the balance of iron and unavoidable impurities.
Wherein, the super duplex stainless steel S32760 comprises, in weight percent: c: si 0-0.03 wt% less than or equal to 1.00 wt% Mn less than or equal to 1.00 wt% P less than or equal to 0.030 wt% S less than or equal to 0.010 wt% Cr:24.0% -26.0% Ni:6.0% -8.0% mo:3.0% -4.0% n:0.20% -0.30% cu:0.50% -1.00% w:0.50% -1.00% of iron and unavoidable impurities.
Further preferably, the super duplex stainless steel is a cold coil or cold plate with a thickness of 0.5-4.0mm.
On the other hand, the invention also provides the super duplex stainless steel, and the super duplex stainless steel is annealed by adopting the annealing method in the preparation process.
The super duplex stainless steel product provided by the invention has qualified structure and performance, meets the requirements of domestic high-end corrosion-resistant industry, and replaces import.
Examples
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention. The experimental methods without specific conditions noted in the following examples follow conventional methods and conditions.
Example 1
Annealing target: the cold coil with the thickness of 3mm and the cold rolling deformation rate of 40% S32750 has a metallographic structure chart shown in figure 1.
S32750 comprises the following components in percentage by weight: c: si 0-0.03 wt% less than or equal to 0.8 wt% Mn less than or equal to 1.20 wt% P less than or equal to 0.035 wt% S less than or equal to 0.020 wt% Cr:24.0% -26.0% Ni:6.0% -8.0% mo:3.0% -5.0% n: cu is 0.24-0.32% and less than or equal to 0.50%, and the balance is iron and unavoidable impurities.
1. Annealing and heating stage process:
heating to raise the temperature of the stainless steel S32750 to 750-1020 ℃ for 1.5min.
2. Annealing and heat preservation section process:
preserving the temperature at 1060 ℃ for 5.5min.
3. Cooling process after annealing:
immediately water-cooling after the heat preservation section, wherein the cooling speed is 400 ℃/s, and the cooling time is 1s.
Through detection, the 3mm thick S32750 cold coil produced by the process has no precipitated phase in the tissue. The metallographic structure diagram is shown in figure 2.
Typical mechanical properties are Rm 975MPa, rp0.2 700MPa, A50 28%, HB 257/257, meeting ASTM A240 requirements.
Example 2
Annealing target: a cold coil having a thickness of 3.5mm and a cold rolling deformation ratio of 30% S32760.
S32760, comprising the following components in percentage by weight: c: si 0-0.03 wt% less than or equal to 1.00 wt% Mn less than or equal to 1.00 wt% P less than or equal to 0.030 wt% S less than or equal to 0.010 wt% Cr:24.0% -26.0% Ni:6.0% -8.0% mo:3.0% -4.0% n:0.20% -0.30% cu:0.50% -1.00% w:0.50% -1.00%, and the balance of iron and unavoidable impurities.
1. Annealing and heating stage process:
heating to raise the temperature of the stainless steel S32760 to 750-1020 ℃ for 2min.
2. Annealing and heat preservation section process:
preserving the heat at 1080 ℃ for 6min.
3. Cooling process after annealing:
immediately after the heat preservation section, water cooling is carried out, the cooling speed is 450 ℃/s, and the cooling time is 1s.
Through detection, the S32760 cold coil with the thickness of 3.5mm produced by the process has no precipitated phase in the tissue and is exported overseas.
Typical mechanical properties are Rm is 480 MPa, rp0.2 is 720MPa, A50 is 28%, and HRC is 26/26.5/25, meeting ASTM A240 requirements.
Comparative example 1
Annealing target: a cold coil having a thickness of 3mm and a cold rolling deformation ratio of 50% S32750.
S32750 comprises the following components in percentage by weight: c: si 0-0.03 wt% less than or equal to 0.8 wt% Mn less than or equal to 1.20 wt% P less than or equal to 0.035 wt% S less than or equal to 0.020 wt% Cr:24.0% -26.0% Ni:6.0% -8.0% mo:3.0% -5.0% n: cu is 0.24-0.32% and less than or equal to 0.50%, and the balance is iron and unavoidable impurities.
1. Annealing and heating stage process:
heating to raise the temperature of the stainless steel to 750-1020 ℃ for 6min.
2. Annealing and heat preservation section process:
preserving the heat for 3min at 1060 ℃.
3. Cooling process after annealing:
immediately water-cooling after the heat preservation section, wherein the cooling speed is 200 ℃/s, and the cooling time is 1s.
According to detection, the 3mm thick S32750 cold coil produced by the process has a large amount of precipitated phases in the structure, so that the steel plate becomes brittle and generates broken strips, and the metallographic structure diagram is shown in figure 3.
Comparative example 2
Annealing target: a cold coil having a thickness of 3mm and a cold rolling deformation ratio of 40% S32750.
S32750 comprises the following components in percentage by weight: c: si 0-0.03 wt% less than or equal to 0.8 wt% Mn less than or equal to 1.20 wt% P less than or equal to 0.035 wt% S less than or equal to 0.020 wt% Cr:24.0% -26.0% Ni:6.0% -8.0% mo:3.0% -5.0% n: cu is 0.24-0.32% and less than or equal to 0.50%, and the balance is iron and unavoidable impurities.
1. Annealing and heating stage process:
heating to raise the temperature of the stainless steel to 750-1020 ℃ for 4min.
2. Annealing and heat preservation section process:
preserving the heat for 3min at 1060 ℃.
3. Cooling process after annealing:
immediately water-cooling after the heat preservation section, wherein the cooling speed is 200 ℃/s, and the cooling time is 1s.
Through detection, the 3mm thick S32750 cold coil produced by the process has a precipitated phase in a structure, and a metallographic structure diagram is shown in figure 4.
Typical mechanical properties are Rm of 1200 MPa, rp0.2 of 690MPa, A50 of 23%, and HRC of 33/34, which do not meet ASTM A240.
The present invention has been disclosed above in terms of preferred embodiments, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions equivalent to those of the embodiments are considered to be covered by the scope of the claims of the present invention. The scope of the invention should, therefore, be determined with reference to the appended claims.
Claims (5)
1. A method of annealing a super duplex stainless steel, comprising:
(1) Controlling the heating time according to the cold rolling deformation rate, and heating the super duplex stainless steel to 750-1020 ℃;
(2) Controlling the heat preservation time according to the cold rolling deformation rate, so that the super duplex stainless steel is subjected to heat preservation at 1020-1100 ℃;
(3) Cooling;
when the cold rolling deformation rate is 0-20%, the heating time is less than or equal to 5min, and the heat preservation time is 3-10min;
when the cold rolling deformation rate is 21% -30%, the heating time is less than or equal to 3min, and the heat preservation time is 4-10min;
when the cold rolling deformation rate is 31% -50%, the heating time is less than or equal to 2min, and the heat preservation time is 5-10min;
when the cold rolling deformation rate is 51% -70%, the heating time is less than or equal to 1min, and the heat preservation time is 5-10min.
2. The annealing method of super duplex stainless steel according to claim 1, wherein the cooling speed is 150-500 ℃/s and the cooling time period is 1-5s.
3. The annealing method of super duplex stainless steel according to claim 1, wherein the thickness of the super duplex stainless steel is 0.5-4.0mm.
4. The method of annealing super duplex stainless steel according to claim 1, wherein the super duplex stainless steel is S32750 or S32760 cold coil or cold plate.
5. A super duplex stainless steel, characterized in that it is annealed during the manufacturing process by the annealing method according to any one of claims 1-4.
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| KR101668532B1 (en) * | 2014-12-26 | 2016-10-24 | 주식회사 포스코 | Super duplex stainless steel with excellent yield strength and imfact toughness, and menufacturing method thereof |
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| KR101903181B1 (en) * | 2016-12-23 | 2018-10-01 | 주식회사 포스코 | Duplex stainless steel with improved corrosion resistance and formability and method of manufacturing the same |
| CN109355485A (en) * | 2018-11-19 | 2019-02-19 | 重庆大学 | A kind of preparation method of High-strength high-plasticity ferrite austenite dual phase steel |
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