CN114645132B - Continuous annealing SPCC steel belt with performance close to that of cover annealing product - Google Patents
Continuous annealing SPCC steel belt with performance close to that of cover annealing product Download PDFInfo
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- CN114645132B CN114645132B CN202210141519.6A CN202210141519A CN114645132B CN 114645132 B CN114645132 B CN 114645132B CN 202210141519 A CN202210141519 A CN 202210141519A CN 114645132 B CN114645132 B CN 114645132B
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- 238000000137 annealing Methods 0.000 title claims abstract description 79
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 50
- 239000010959 steel Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 claims abstract description 24
- 239000000126 substance Substances 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000010583 slow cooling Methods 0.000 claims description 11
- 238000002791 soaking Methods 0.000 claims description 11
- 238000010791 quenching Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 235000013619 trace mineral Nutrition 0.000 claims description 5
- 239000011573 trace mineral Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 238000001556 precipitation Methods 0.000 abstract description 8
- 238000009628 steelmaking Methods 0.000 abstract description 4
- 230000008520 organization Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 12
- 229910052799 carbon Inorganic materials 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000035882 stress 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- 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
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
-
- 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
-
- 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
- C21D11/00—Process control or regulation for heat treatments
-
- 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
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The application provides a continuous annealing SPCC steel belt with performance close to that of a cover annealing product, which comprises the following chemical components in percentage by weight: 0.05 to 0.07 percent, si is less than or equal to 0.02 percent, mn:0.1 to 0.2 percent, P is less than or equal to 0.02 percent, S is less than or equal to 0.015 percent, N is less than or equal to 0.005 percent, al:0.03 to 0.05 percent. The application shortens the steelmaking process flow, shortens the annealing process flow, improves the production efficiency, reduces the cost and optimizes the product organization and precipitation.
Description
The application is as follows: application number: 2020106722882, filing date: 7 months 14 days 2020, name: a method for manufacturing continuous annealing SPCC steel belt with performance close to that of a cover annealing product and a divisional application of the continuous annealing SPCC steel belt.
Technical Field
The application relates to the field of metallurgy, in particular to a continuous annealing process of a low-yield-strength SPCC steel strip, and especially relates to a continuous annealing SPCC steel strip with performance close to that of a shielding annealing product.
Background
The general cold rolled Steel sheet SPCC (Steel plate-rolled common) is a low-carbon aluminum killed Steel widely used in the automobile manufacturing industry, the household appliance industry, the galvanized and tin-plated base plate and the like, and plays a main role in the current cold rolled product market. Compared with two production processes, the continuous annealing process for producing the SPCC product has the remarkable advantages of good surface quality, stable and uniform performance, high yield, short production period, timely supply, environmental protection, low energy consumption and the like; however, the continuous annealing product has higher yield strength, is unfavorable for users, and the problem that a yield platform is easy to appear after annealing is more serious to restrict the use and development of the continuous annealing SPCC product.
In summary, the following problems exist in the prior art: the existing SPCC steel strip continuous annealing process enables the yield strength of the product to be high.
Disclosure of Invention
The application provides a manufacturing method for continuous annealing of an SPCC steel belt and a continuous annealing SPCC steel belt, namely a manufacturing method for continuous annealing of an SPCC steel belt with performance close to that of a cover annealing product and a continuous annealing SPCC steel belt, so as to solve the problem that the yield strength of the product is higher due to the existing continuous annealing process of the SPCC steel belt.
Therefore, the application provides a continuous annealing SPCC steel belt manufacturing method with performance close to that of a cover annealing product, which comprises the following steps:
the steel strip is continuously annealed after cold rolling;
the continuous annealing process parameters are as follows: the outlet temperature of the heating section is 810+/-2 ℃, the outlet of the soaking section is 810+/-2 ℃, the outlet of the slow cooling section is 720+/-2 ℃, the outlet of the fast cooling section is 400+/-2 ℃, the outlet of the overaging section is 400+/-2 ℃, and the outlet temperature of the final cooling is 170+/-2 ℃.
Further, the running speed of the strip steel in the annealing furnace is 230m/min.
Further, the dimensions of the steel strip are: 2400m long, 1250mm wide and 0.8mm thick.
Further, the steel comprises the following chemical components in percentage by weight: 0.05 to 0.07 percent, si is less than or equal to 0.02 percent, mn:0.1 to 0.2 percent, P is less than or equal to 0.02 percent, S is less than or equal to 0.015 percent, N is less than or equal to 0.005 percent, al:0.03 to 0.05 percent, and the balance of Fe and unavoidable trace elements.
Further, in the continuous annealing, the heating time from the room temperature to the annealing furnace until the steel strip reaches the outlet temperature of the heating section was 2.9 minutes, the time from the outlet temperature of the heating section to the outlet temperature of the soaking section was 48 seconds, the time from the outlet temperature of the soaking section to the outlet temperature of the slow cooling section was 12 seconds, the time from the outlet temperature of the slow cooling section to the outlet temperature of the rapid cooling section was 15 seconds, and the time from the outlet temperature of the rapid cooling section to the outlet temperature of the overaging section was 2.85 minutes.
Further, the time from the outlet temperature of the overaging section to the final cooling outlet temperature was 48 seconds.
Further, the outlet temperature of the water quenching section is 25 ℃.
Further, the time from the final cooling outlet temperature to the outlet temperature of the water quench section was 18 seconds.
Further, in continuous annealing, the total annealing time from entry of the steel strip into the annealing furnace at room temperature to exit of the annealing furnace at the exit temperature of the water quenching section was 8.1 minutes.
The application also provides a continuous annealing SPCC steel belt, which comprises the following chemical components in percentage by weight: 0.05 to 0.07 percent, si is less than or equal to 0.02 percent, mn:0.1 to 0.2 percent, P is less than or equal to 0.02 percent, S is less than or equal to 0.015 percent, N is less than or equal to 0.005 percent, al:0.03% -0.05%, and the balance being Fe and unavoidable trace elements, wherein the continuous annealing process parameters of the continuous annealing SPCC steel belt are as follows: the outlet temperature of the heating section is 810+/-2 ℃, the outlet of the soaking section is 810+/-2 ℃, the outlet of the slow cooling section is 720+/-2 ℃, the outlet of the fast cooling section is 400+/-2 ℃, the outlet of the overaging section is 400+/-2 ℃, and the outlet temperature of the final cooling is 170+/-2 ℃.
Further, the chemical components of the continuous annealing SPCC steel belt in percentage by weight are as follows: 0.067%, si:0.018%, mn:0.17%, P:0.013%, S:0.012%, N:0.043%, al:0.038% and the balance of Fe and unavoidable trace elements.
According to the continuous annealing process design, components do not need to be adjusted, the steelmaking process flow is shortened, the annealing process flow is shortened, the production efficiency is improved, the cost is reduced, the product organization and precipitation are optimized, and the continuous annealing SPCC steel strip with the performance close to that of a shielding annealing product is produced.
Drawings
FIG. 1a is a photograph of a metallographic structure of a continuously annealed product, magnified 200 times;
FIG. 1b is a photograph of a metallographic structure of a cap annealed product, magnified 200 times;
FIG. 2 is a schematic diagram of a conventional SPCC continuous annealing process route;
FIG. 3 is a schematic diagram of the SPCC continuous annealing process route of the present application;
FIG. 4 is a photograph of a metallographic structure of an SPCC steel strip of example 1 of the present application, magnified 500 times;
FIG. 5 is a photograph of the microstructure of the SPCC steel strip of example 1 of the present application, magnified 3500 times;
FIG. 6 is a photograph of the metallographic structure of comparative example 1, at 500 times magnification;
FIG. 7 is a photograph of the microstructure of comparative example 1, magnified 3500 times.
Detailed Description
For a clearer understanding of technical features, objects, and effects of the present application, the present application will be described with reference to the accompanying drawings.
The principle of the application:
the applicant compares the metallographic structures of the continuous annealing product and the shielding annealing product. The metallographic structures of the continuous annealing product and the shielding annealing product are respectively shown in fig. 1a and b. Compared with the annealing product, the grain size of the annealing product is smaller, carbide precipitation in steel is less, and carbon elements mainly exist in the steel in the form of solid solution carbon. The applicant believes that: the smaller grain size and higher solid solution carbon content become the main reasons for the high yield strength and the susceptibility to yield stress of the continuous annealing product.
The existing continuous annealing process of the continuous annealing SPCC steel belt is generally as follows: the annealing process is shown in figure 2, wherein the outlet temperature of the heating section is 780 ℃, the outlet of the soaking section is 780 ℃, the outlet of the slow cooling section is 680 ℃, the outlet of the fast cooling section is 470 ℃, the outlet of the overaging section is 390 ℃, the final cooling outlet temperature is 180 ℃, the outlet temperature of the water quenching section is 25 ℃, the running speed of the strip steel is 180 m/min.
The strength of the SPCC product is mainly dependent on the grain size and the precipitation of carbides in the steel. For the continuous annealing process, the heating section, the soaking section and the slow cooling section mainly generate recrystallization and grain growth processes of the strip steel, and the fast cooling section and the overaging section mainly generate carbide precipitation processes in the steel. The average heating temperature of the strip steel is increased by increasing the heating temperature, the soaking temperature and the slow cooling temperature, so that the full growth of the grain size is promoted; the supersaturation degree of solid solution carbon in steel is increased when the strip steel enters the ageing section by reducing the quick cooling temperature, so that carbide precipitation power is improved, and a higher overageing outlet temperature is ensured by adopting a heating and heat-preserving mode in the overageing section, so that carbide precipitation efficiency in the overageing section is improved, and the phenomenon of high strength of the strip steel due to small size of carbide is avoided.
The continuous annealing SPCC steel belt adopted by the application comprises the following chemical components in percentage by weight: 0.067%, si:0.018%, mn:0.17%, P:0.013%, S:0.012%, N:0.043%, al:0.038% and the balance of Fe and unavoidable trace elements. The steel strip was continuously annealed after cold rolling at a running speed of 230m/min in an annealing furnace, and the continuous annealing process is shown in the following table 1 and fig. 3.
Table 1 continuous annealing process scheme
| Heating temperature/. Degree.C | Soaking temperature/. Degree.C | Slow cooling temperature/°c | Quick cooling temperature/DEGC | Overaging temperature/. Degree.C | Final cooling outlet temperature/°c |
| 810 | 810 | 720 | 400 | 400 | 170 |
Wherein Table 2 shows annealing process parameters of the examples and the comparative examples, table 3 shows mechanical properties of the examples and the comparative examples, and FIGS. 4, 5, 6 and 7 show typical tissue photographs of the examples and the comparative examples, respectively. Comparative example 1 is a product having the same chemical composition as example 1, but using the prior art continuous annealing process shown in fig. 2.
In FIG. 4, the metallographic structure of example 1 has a grain size of 8.5, and in FIG. 5, the intragranular carbide of example 1 is largely precipitated; in FIG. 6, the metallographic structure of comparative example 1 has a grain size of 10 grades, and in FIG. 7, the grains of comparative example 1 have almost no carbide precipitation
Table 2 specific process parameters for each example and comparative example
TABLE 3 mechanical Properties of examples and comparative examples
| Examples | R p0.2 /MPa | R m /MPa | A 80mm /％ |
| Example 1 | 203 | 355 | 38 |
| Example 2 | 205 | 360 | 37.5 |
| Example 3 | 206 | 358 | 37.5 |
| Comparative example 1 | 264 | 375 | 35.5 |
| Comparative example 2 | 268 | 380 | 35 |
The continuous annealing SPCC product with performance similar to that of the shield annealing product is produced only by optimizing the annealing process, the steelmaking components do not need to be adjusted, the steelmaking process flow is shortened, the annealing time is shortened, the production efficiency is improved, the cost is reduced, and huge economic and social benefits are achieved.
The foregoing is illustrative of the present application and is not to be construed as limiting the scope of the application. In order that the components of the application may be combined without conflict, any person skilled in the art shall make equivalent changes and modifications without departing from the spirit and principles of the application.
Claims (6)
1. The continuous annealing SPCC steel belt is characterized by comprising the following chemical components in percentage by weight: 0.05% -0.07%, si is less than or equal to 0.02%, mn: 0.1-0.2%, P is less than or equal to 0.02%, S is less than or equal to 0.015%, N is less than or equal to 0.005%, al:0.03% -0.05%, and the balance being Fe and unavoidable trace elements, wherein the continuous annealing process parameters of the continuous annealing SPCC steel strip are as follows: the outlet temperature of the heating section is 810+/-2 ℃, the outlet of the soaking section is 810+/-2 ℃, the outlet of the slow cooling section is 720+/-2 ℃, the outlet of the fast cooling section is 400+/-2 ℃, the outlet of the overaging section is 400+/-2 ℃, and the outlet temperature of the final cooling is 170+/-2 ℃;
in the continuous annealing, the heating time from the room temperature of the steel strip entering the annealing furnace to the temperature of the steel strip reaching the outlet of the heating section is 2.9 minutes; the time from the outlet temperature of the heating section to the outlet temperature of the soaking section is 48 seconds, and the time from the outlet temperature of the soaking section to the outlet temperature of the slow cooling section is 12 seconds; the time from the outlet temperature of the slow cooling section to the outlet temperature of the fast cooling section is 15 seconds, and the time from the outlet temperature of the fast cooling section to the outlet temperature of the overaging section is 2.85 minutes;
mechanical properties of continuous annealing SPCC steel strip:R p0.2 ：203 MPa，R m ：355 MPa，A 80mm ：38%。
2. the continuous annealing SPCC steel strip of claim 1, wherein the strip has dimensions of: 2400m long, 1250mm wide and 0.8mm thick.
3. The continuous annealing of SPCC steel strip as claimed in claim 1 wherein the total annealing time from entry of the strip into the annealing furnace at room temperature to exit of the annealing furnace at the exit temperature of the water quench section is 8.1 minutes.
4. The continuous annealing SPCC steel strip of claim 1, wherein the time from the overage section exit temperature to the final cold exit temperature is 48 seconds.
5. The continuous annealing SPCC steel strip of claim 1, wherein the water quench section outlet temperature is 25 ℃.
6. The continuous annealing SPCC steel strip of claim 1, wherein the time from the final cool-out temperature to the water quench section exit temperature is 18 seconds.
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| CN202210141519.6A CN114645132B (en) | 2020-07-14 | 2020-07-14 | Continuous annealing SPCC steel belt with performance close to that of cover annealing product |
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| CN202010672288.2A CN111961833B (en) | 2020-07-14 | 2020-07-14 | Manufacturing method of continuous-annealing SPCC steel strip with performance close to that of cover annealing product and continuous-annealing SPCC steel strip |
| CN202210141519.6A CN114645132B (en) | 2020-07-14 | 2020-07-14 | Continuous annealing SPCC steel belt with performance close to that of cover annealing product |
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| CN112658602A (en) * | 2020-12-04 | 2021-04-16 | 安阳钢铁股份有限公司 | Production method of cold-rolled weathering steel Q355GNH for boiler exchanger |
| CN114657334B (en) * | 2022-03-25 | 2023-11-17 | 西宁特殊钢股份有限公司 | Annealing process of mining round-link chain steel 23MnNiMoCr54 with structure control and hardness control |
| CN114807529A (en) * | 2022-05-06 | 2022-07-29 | 天津市新天钢冷轧薄板有限公司 | Process for reducing risk of producing SPCC (SpcC (spray cooled continuous casting) material by continuous annealing furnace |
| CN115369213B (en) * | 2022-09-13 | 2023-08-08 | 包头钢铁（集团）有限责任公司 | Production method for improving ductility and plasticity of common carbon steel for household appliances |
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| CN114645132A (en) | 2022-06-21 |
| CN111961833B (en) | 2022-03-08 |
| CN111961833A (en) | 2020-11-20 |
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