CN114032368B - Heat treatment method of ferrite stainless steel 00Cr18Mo2 - Google Patents
Heat treatment method of ferrite stainless steel 00Cr18Mo2 Download PDFInfo
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- CN114032368B CN114032368B CN202111418991.1A CN202111418991A CN114032368B CN 114032368 B CN114032368 B CN 114032368B CN 202111418991 A CN202111418991 A CN 202111418991A CN 114032368 B CN114032368 B CN 114032368B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 35
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000010935 stainless steel Substances 0.000 title claims abstract description 19
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000011534 incubation Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 12
- 239000010959 steel Substances 0.000 abstract description 12
- 239000000463 material Substances 0.000 abstract description 8
- 238000005496 tempering Methods 0.000 abstract description 6
- 238000011282 treatment Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000001953 recrystallisation Methods 0.000 abstract description 3
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 229910000619 316 stainless steel Inorganic materials 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention belongs to the technical field of ferrous metallurgy, and discloses a heat treatment method of ferrite stainless steel 00Cr18Mo2 capable of improving comprehensive mechanical properties of materials, which comprises the following steps: (a) Controlling the finishing temperature of the ferrite stainless steel 00Cr18Mo2 at 850-880 ℃, and cooling to room temperature after descaling by high-pressure water; (b) And (3) heating the ferrite stainless steel 00Cr18Mo2 cooled to room temperature in the step (a) to 650-680 ℃ again, preserving heat for 0.5-1 hour, and then performing air cooling or air cooling to room temperature. According to the invention, after the steel is rolled and cooled, tempering treatment is carried out at 650-680 ℃, so that the internal stress generated in the processing process of the material can be effectively eliminated, and a recrystallization structure which is beneficial to improving the self-performance of the material can be obtained; and by adopting relatively low-temperature tempering, the treatment time can be shortened, the better comprehensive mechanical property can be obtained, and meanwhile, the mechanical processing can be performed while a certain strength is maintained.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a heat treatment method of ferrite stainless steel 00Cr18Mo 2.
Background
Developed countries have successfully developed substitutes for 304 stainless steel and 316 stainless steel, namely 00Cr18Mo2 stainless steel, from the 70 th century, which greatly improves the stress corrosion resistance. The steel grade is actually obtained by adding Mo to 430 (1 Cr 17), slightly increasing Cr, further reducing the content of impurity elements such as C, N and the like and stabilizing. With the advent and popularization of vacuum refining technology typified by VOD, and in particular, the implementation of a three-step stainless steel smelting process, it became possible to reduce C, N content in ferritic stainless steel to a very low level, and after 80 s, this steel grade has been mass-produced and applied in developed countries typified by japan. In addition, 00Cr18Mo2 ferritic stainless steel is also used for solar water heaters, heat exchangers, roofs of stadiums, and the like.
After the heat treatment of the 00Cr18Mo2 ferritic stainless steel, heat treatment is generally required to reduce the hardness so as to facilitate cold deformation and mechanical processing. For 00Cr18Mo2 ferrite stainless steel, the steel has certain plastic deformation capacity after 800-1000 annealing treatment, but the comprehensive mechanical property is still to be improved. Softening means of high-temperature heat treatment semi-finished products above 1000 ℃ are not claimed in principle, because the microstructure of the ferritic stainless steel is ferrite at high temperature, no transformation exists, and the high-temperature heat treatment can lead the grain size of the 00Cr18Mo2 ferritic stainless steel to be large, reduce the toughness and influence the cold deformation and the machining use.
Disclosure of Invention
The invention solves the technical problem of providing a heat treatment method of ferritic stainless steel 00Cr18Mo2, which can improve the comprehensive mechanical properties of materials.
The technical scheme adopted for solving the technical problems is as follows: a heat treatment method of ferritic stainless steel 00Cr18Mo2, comprising the steps of:
(a) Controlling the finishing temperature of the ferrite stainless steel 00Cr18Mo2 at 850-880 ℃, and cooling to room temperature after descaling by high-pressure water;
(b) And (3) heating the ferrite stainless steel 00Cr18Mo2 cooled to room temperature in the step (a) to 650-680 ℃ again, preserving heat for 0.5-1 hour, and then performing air cooling or air cooling to room temperature.
Further is: in step (b), the ferritic stainless steel 00Cr18Mo2 cooled to room temperature in step (a) is heated again to 670 ℃.
Further is: in step (b), the incubation time was 1 hour.
The beneficial effects of the invention are as follows: according to the heat treatment method of the ferritic stainless steel 00Cr18Mo2, after the steel is rolled and cooled, tempering treatment is carried out between 650 and 680 ℃, the internal stress generated by the material in the processing process can be effectively eliminated, and a recrystallization structure which is beneficial to improving the self performance of the material can be obtained; and by adopting relatively low-temperature tempering, the treatment time can be shortened, the better comprehensive mechanical property can be obtained, and meanwhile, the mechanical processing can be performed while a certain strength is maintained.
Detailed Description
The invention is further described below in connection with the following detailed description.
In the present invention, directional terms such as up, down, left, right, front, rear, and azimuth are used to facilitate the description of the relative positional relationship between the members, and are not meant to refer specifically to the absolute position of the relative member or the inter-member relationship, but are used only to explain the relative positional relationship, movement, and the like between the members in a specific posture, and if the specific posture is changed, the directional terms are changed accordingly. In the present invention, the terms "plurality", "a plurality" and the like refer to two or more. In addition, the quality of the product according to the present invention can be clearly classified by referring to industry-related standards, and therefore, it is not unclear.
The invention relates to a heat treatment method of ferrite stainless steel 00Cr18Mo2, which comprises the following steps:
(a) Controlling the finishing temperature of the ferrite stainless steel 00Cr18Mo2 at 850-880 ℃, and cooling to room temperature after descaling by high-pressure water;
(b) And (3) heating the ferrite stainless steel 00Cr18Mo2 cooled to room temperature in the step (a) to 650-680 ℃ again, preserving heat for 0.5-1 hour, and then performing air cooling or air cooling to room temperature. The step (b) is to actually temper the rolled steel at 650-680 ℃, so that the internal stress generated in the processing process of the material can be effectively eliminated, and a recrystallization structure which is favorable for improving the self-performance of the material can be obtained; and by adopting relatively low-temperature tempering, the treatment time can be shortened, the better comprehensive mechanical property can be obtained, and meanwhile, the mechanical processing can be performed while a certain strength is maintained.
More specifically: in step (b), the ferritic stainless steel 00Cr18Mo2 cooled to room temperature in step (a) is heated again to 670 ℃.
More specifically: in step (b), the incubation time was 1 hour.
Example 1
Selecting a ferrite stainless steel 00Cr18Mo2 continuous casting blank, rolling the continuous casting blank into phi 6.5 disc, controlling the final rolling temperature to 850-880 ℃, and performing high-pressure water descaling and then air cooling to room temperature; the main components of the steel are shown in Table 1. According to the method, the phi 6.5 coils of the 00Cr18Mo2 steel grade are subjected to heat treatment by different processes, and the treated samples are subjected to mechanical property test according to the national standard.
TABLE 1 chemical composition of 06Cr15Ni5Cu2Ti Steel
The following three heat treatments were performed respectively:
firstly, heating the 00Cr18Mo2 steel sample to 1000 ℃ in a heating furnace, preserving heat for 40 minutes, and then cooling to room temperature in an air way.
And secondly, heating the 00Cr18Mo2 steel sample to 850 ℃ in a heating furnace, preserving heat for 40 minutes, and then cooling to room temperature in an air way.
And thirdly, heating the 00Cr18Mo2 steel sample to 670 ℃ in a heating furnace, preserving heat for 40 minutes, and then cooling to room temperature in an air way.
The results of the room temperature mechanical property test of the 00Cr18Mo2 stainless steel treated by the three different heat treatment processes are shown in Table 2.
TABLE 3 mechanical Properties at room temperature after different heat treatment processes
Wherein, the formability with high tensile strength is good, and the deformation is not easy to occur in the machining process; the larger the elongation after breaking, the better the plasticity; the higher the impact energy is, the better the toughness is; therefore, the corresponding mechanical properties of products of different heat treatment processes can be well reflected through the test data.
The test results of the three different heat treatment processes show that compared with the 670 ℃ heat treatment temperature and the 1000 ℃ heat treatment temperature and the 850 ℃ heat treatment temperature adopted by the technical scheme of the invention, the strength of the 00Cr18Mo2 ferritic stainless steel is improved and the toughness is also improved after tempering at 670 ℃, so that the strength and the toughness are obviously improved, and the comprehensive mechanical property of the 00Cr18Mo2 ferritic stainless steel can be obviously improved by adopting the technical scheme of the invention. In addition, further analysis by a scanning electron microscope and a light microscope can find that the sample corresponding to the technical scheme of the invention has finer crystal grains, thereby leading to high strength and high toughness.
Claims (3)
1. A heat treatment method of ferrite stainless steel 00Cr18Mo2 is characterized in that: the method comprises the following steps:
(a) Controlling the finishing temperature of the ferrite stainless steel 00Cr18Mo2 at 850-880 ℃, and cooling to room temperature after descaling by high-pressure water;
(b) And (3) heating the ferrite stainless steel 00Cr18Mo2 cooled to room temperature in the step (a) to 650-680 ℃ again, preserving heat for 0.5-1 hour, and then performing air cooling or air cooling to room temperature.
2. The heat treatment method of the ferritic stainless steel 00Cr18Mo2, wherein the heat treatment method comprises the following steps: in step (b), the ferritic stainless steel 00Cr18Mo2 cooled to room temperature in step (a) is heated again to 670 ℃.
3. A heat treatment method of ferritic stainless steel 00Cr18Mo2 according to claim 1 or 2, characterized in that: in step (b), the incubation time was 1 hour.
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| CN114032368B true CN114032368B (en) | 2023-05-30 |
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| CN108486464A (en) * | 2018-03-30 | 2018-09-04 | 湖南华菱涟源钢铁有限公司 | 900MPa grades of ferrite base tempering steel plates of yield strength and production method |
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Effective date of registration: 20231205 Address after: Chengdu International Railway Port Comprehensive Free Trade Zone, No. 1533, Xiangdao Avenue, Qingbaijiang District, Chengdu, Sichuan 610306, China (Sichuan) Pilot Free Trade Zone Patentee after: Chengdu advanced metal material industry technology Research Institute Co.,Ltd. Patentee after: PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL Co.,Ltd. Address before: 610306 Chengdu City, Chengdu, Sichuan, China (Sichuan) free trade test zone, Chengdu City, Qingbaijiang District, xiangdao Boulevard, Chengxiang Town, No. 1509 (room 13, A District, railway port mansion), room 1319 Patentee before: Chengdu advanced metal material industry technology Research Institute Co.,Ltd. |