CN113528955B - High-performance wide-plate-width IF steel and production method thereof - Google Patents
High-performance wide-plate-width IF steel and production method thereof Download PDFInfo
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- 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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- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- 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
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- C21D8/0226—Hot rolling
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- 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
- C21D8/0252—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment with application of tension
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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Abstract
A high-performance wide IF steel and a production method thereof belong to the technical field of cold-rolled plate strip annealing. The technical scheme is as follows: the chemical components by mass percent are as follows: c: less than or equal to 0.0035 percent, less than or equal to 0.02 percent of Si, Mn: 0.06-0.16%, P is less than or equal to 0.02%, S is less than or equal to 0.015%, Als: 0.020-0.060%, Ti: 0.06-0.08%; when the width of the finished product is 1600-; when the width of the finished product is 1700 plus or minus 1800mm, the temperature of the soaking section is 830 +/-5 ℃, and the belt speed is 180 +/-5 m/min; when the width of the finished product is 1800-1900mm, the temperature of the soaking section is 820 +/-5 ℃, and the belt speed is 160 +/-5 m/min. The invention can produce elongation percentage after breakage reaching A80≥48%，r90High performance product not less than 3.0.
Description
Technical Field
The invention relates to high-performance wide IF steel and a production method thereof, belonging to the technical field of annealing of cold-rolled strips in the metallurgical industry.
Background
IF steel, interstitial free steel, is actually an ultra low carbon interstitial free solid solution ferritic steel. IF steel is made by adding Ti and Nb in certain amount into ultra-low carbon steel (C < 0.005% and N < 0.003%), C, N atoms are fixed into carbide and nitride, and no interstitial solid solution atoms exist in the steel.
In a modern continuous annealing production line, the highest temperature of the strip steel reaches a high level in the heating and cooling processes of the strip steel through an annealing furnace, and the temperature change range is large, so that the strip steel generates thermal stress, the elastic modulus, the yield limit and the like of the strip steel are influenced, and plastic deformation is easy to occur. And under the comprehensive influence of factors such as annealing temperature in the furnace, original plate shape of the strip steel, temperature difference in the width direction, tension in the furnace, guide roll shape, friction and the like, the change of the plate shape of the strip steel presents various forms. Wherein, the elastic stretching deformation which can be recovered is adopted, namely the wave shape is changed from big to small; the elastic buckling deformation which can be recovered, namely the buckling or wave shape caused by thermal stress is changed from small to big; permanent plastic tensile deformation is also generated, namely the wave shape is changed from big to small and even flattened; in addition, local plastic stretching under a hot state causes buckling after cooling, namely so-called 'hot buckling' in production, particularly when a continuous annealing unit carries out thin and wide-specification IF strip steel production.
The thermal buckling is a phenomenon that wide-width IF steel is easy to appear in a continuous annealing furnace, and is represented as that strip steel is folded in a transverse plate shape, the problem is that the strip steel is low in strength, and under the condition that furnace rollers have convexity, the phenomenon that the strip steel is transversely buckled is caused due to the interaction of three factors, namely temperature, tension and speed, the currently and generally adopted mode is low-temperature and small-tension control, the thermal buckling problem is avoided, and the production is stable. But the tension is low, so that the deviation risk exists, the deviation of the strip steel in the furnace is corrected by improving the deviation correcting device on one hand, and inward centripetal force is formed by the convexity of the furnace roller on the other hand. When the tension in the furnace is too low, a mechanism for correcting the deviation through the convexity of the furnace roller is not easy to play a role, so that the strip steel deviates. Under the condition that the deviation rectifying device cannot rectify the deviation, the strip steel still can scratch the furnace wall, so that the strip is broken. For example, the Chinese patent application No. 201410336596.2, entitled "method for processing buckling in thin and wide IF steel furnace", teaches that when the thin and wide IF steel is started after the furnace is stopped, proper starting temperature, tension and speed are set; the invention patent application ' variable-convexity multifunctional roller ' in China ' with application number 201320869825.8 teaches that the deviation or the hot buckling of the strip steel is improved by adjusting the convexity of the roller of the furnace.
Disclosure of Invention
The invention aims to provide high-performance wide-width IF steel and a production method thereof, which are characterized in that different component systems are designed according to different product specifications, a proper hot rolling process is matched, the tension of an annealing furnace is reasonably distributed, the problem of thermal buckling is avoided, high mechanical properties are achieved, and the problems in the background art are solved.
The technical scheme of the invention is as follows:
a high-performance wide IF steel with a thickness of 0.6-0.8mm and a width of 1600-1900mm comprises the following chemical components in percentage by mass: c: less than or equal to 0.0035 percent, less than or equal to 0.02 percent of Si, Mn: 0.06-0.16%, P is less than or equal to 0.02%, S is less than or equal to 0.015%, Als: 0.020-0.060%, Ti: 0.06-0.08%.
The high-performance wide IF steel has finished product thickness of 0.6-0.8mm, elongation after fracture of not less than 48 percent and plastic strain ratio r90≥3.0。
A production method of high-performance wide-width IF steel comprises hot rolling, cold rolling and annealing, wherein the thickness of a finished product is 0.6-0.8mm, the width is 1600-1900mm, and the chemical components in percentage by mass are as follows: c: less than or equal to 0.0035 percent, less than or equal to 0.02 percent of Si, Mn: 0.06-0.16%, P is less than or equal to 0.02%, S is less than or equal to 0.015%, Als: 0.020-0.060%, Ti: 0.06-0.08%;
hot rolling: the slab heating temperature is 1220-;
annealing: when the thickness of the finished product is 0.6-0.8mm and the width is 1600-1700mm, the temperature of the soaking section of the annealing furnace is 840 +/-5 ℃, the belt speed is 200 +/-5 m/min, the tension of the soaking section is 7-7.5KN, and the tension of the aging section is 6-6.5 KN; when the thickness of the finished product is 0.6-0.8mm and the width is 1700 plus or minus 1800mm, the temperature of the soaking section of the annealing furnace is 830 +/-5 ℃, the belt speed is 180 +/-5 m/min, the tension of the soaking section is 7.5-8KN, and the tension of the aging section is 5.8-6.3 KN; when the thickness of the finished product is 0.6-0.8mm and the width is 1800-1900mm, the temperature of the soaking section of the annealing furnace is 820 +/-5 ℃, the belt speed is 160 +/-5 m/min, the tension of the soaking section is 8-8.5KN, and the tension of the aging section is 5.5-6 KN.
The high-performance wide IF steel has a finished product thickness of 0.6-0.8mm and a width of 1700-2000mm, and comprises the following chemical components in percentage by mass: c: less than or equal to 0.0035 percent, less than or equal to 0.02 percent of Si, Mn: 0.06-0.16%, P is less than or equal to 0.02%, S is less than or equal to 0.015%, Als: 0.020-0.060%, Ti: 0.04-0.06%, Nb: 0.01 to 0.03 percent.
The high-performance wide IF steel has finished product thickness of 0.6-0.8mm, elongation after fracture of not less than 48 percent and plastic strain ratio r90≥3.0。
A production method of high-performance wide-width IF steel comprises hot rolling, cold rolling and annealing, wherein the thickness of a finished product is 0.6-0.8mm, the width is 1700-2000mm, and the chemical components comprise the following components in percentage by mass: c: less than or equal to 0.0035 percent, less than or equal to 0.02 percent of Si, Mn: 0.06-0.16%, P is less than or equal to 0.02%, S is less than or equal to 0.015%, Als: 0.020-0.060%, Ti: 0.04-0.06%, Nb: 0.01 to 0.03 percent;
hot rolling: the heating temperature of the plate blank is 1220-1290 ℃, the finishing temperature is 890-930 ℃, and the coiling temperature is 700-730 ℃;
annealing: when the thickness of the finished product is 0.6-0.8mm and the width is 1700 plus or minus 1800mm, the temperature of the soaking section of the annealing furnace is 830 +/-5 ℃, the belt speed is 120 +/-5 m/min, the tension of the soaking section is 7.5-8KN, and the tension of the aging section is 6.5-7 KN; when the thickness of the finished product is 0.6-0.8mm and the width is 1800-1900mm, the temperature of the soaking section of the annealing furnace is 820 +/-5 ℃, the belt speed is 110 +/-5 m/min, the tension of the soaking section is 7.8-8.3KN, and the tension of the aging section is 6-6.5 KN; when the thickness of the finished product is 0.6-0.8mm and the width is 1900-2000mm, the temperature of the soaking section of the annealing furnace is 810 +/-5 ℃, the belt speed is 100 +/-5 m/min, the tension of the soaking section is 8.5-9KN, and the tension of the aging section is 5.8-6.3 KN.
The yield strength of the IF steel austenite at high temperature directly affects the transverse heat buckling resistance of the strip steel in the furnace, and is influenced by austenite recrystallization and alloy content. Microalloying is an important factor affecting the grain size of austenite and the grain size of ferrite in the finished product in order to fix the solid solution C, N in the steel sheet. The addition amount of the micro-alloying elements is proper, if the alloy elements of the steel grade are too much, not only the cost is increased, but also the amount of the solid-dissolved Ti or Nb is increased, which is beneficial to improving the recrystallization temperature of austenite, improving the yield strength at high temperature and achieving the buckling resistance, but also causes the recrystallization temperature of ferrite of a finished product to be increased, thus being unfavorable to the performance of the product. For the IF steel added with Ti, the content of the surplus Ti is preferably 0.02-0.04%; the excess Nb of the IF steel treated by Nb + Ti composite treatment is preferably less than 0.02%. In the hot rolling coiling process and the subsequent cooling process, the original NbTiCN particles are aggregated and grown, new NbTiCN particles are continuously separated out, and the higher the coiling temperature is, the larger the average grain size is. The furnace roller convexity in the continuous annealing process is a key device matched with the furnace roller convexity and cannot be changed, and if the convexity is changed, the tension and the temperature can not adapt any more.
The invention has the advantages that: the product has good performance, high annealing temperature, no deflection and no thermal buckling.
The invention is characterized in that the elongation after fracture reaches A through the matching of product specification and component design with annealing temperature and tension80≥48%，r90High-performance product not less than 3.0, and stable production.
The invention has the beneficial effects that: (1) according to the invention, by reasonably designing the components of the wide IF steel product under the condition of the existing equipment, matching with a proper hot rolling process, continuously annealing the tension of the soaking section, the tension of the aging section and the strip speed of the process section, ensuring stable and efficient production of the wide IF steel and avoiding the stopping problem caused by deviation and buckling of strip steel.
(2) According to different product characteristics, the invention matches proper tension and belt speed, so that the product has good performance, and the competitiveness of wide IF steel products of enterprises is improved.
Drawings
FIG. 1 is a schematic view of a furnace roller according to the present invention.
Detailed Description
The invention is further illustrated by way of example in the following with reference to the accompanying drawings.
Referring to the attached figure 1, the high-performance wide IF steel has a finished product thickness of 0.6-0.8mm and a width of 1600-1900mm, and comprises the following chemical components in percentage by mass: c: less than or equal to 0.0035 percent, less than or equal to 0.02 percent of Si, Mn: 0.06-0.16%, P is less than or equal to 0.02%, S is less than or equal to 0.015%, Als: 0.020-0.060%, Ti: 0.06-0.08%.
A production method of high-performance wide-width IF steel comprises hot rolling, cold rolling and annealing, wherein the thickness of a finished product is 0.6-0.8mm, the width is 1600-1900mm, and the chemical components in percentage by mass are as follows: c: less than or equal to 0.0035 percent, less than or equal to 0.02 percent of Si, Mn: 0.06-0.16%, P is less than or equal to 0.02%, S is less than or equal to 0.015%, Als: 0.020-0.060%, Ti: 0.06-0.08%;
hot rolling: the slab heating temperature is 1220-;
annealing: when the thickness of the finished product is 0.6-0.8mm and the width is 1600-1700mm, the temperature of the soaking section of the annealing furnace is 840 +/-5 ℃, the belt speed is 200 +/-5 m/min, the tension of the soaking section is 7-7.5KN, and the tension of the aging section is 6-6.5 KN; when the thickness of the finished product is 0.6-0.8mm and the width is 1700 plus or minus 1800mm, the temperature of the soaking section of the annealing furnace is 830 +/-5 ℃, the belt speed is 180 +/-5 m/min, the tension of the soaking section is 7.5-8KN, and the tension of the aging section is 5.8-6.3 KN; when the thickness of the finished product is 0.6-0.8mm and the width is 1800-1900mm, the temperature of the soaking section of the annealing furnace is 820 +/-5 ℃, the belt speed is 160 +/-5 m/min, the tension of the soaking section is 8-8.5KN, and the tension of the aging section is 5.5-6 KN.
The high-performance wide IF steel has a finished product thickness of 0.6-0.8mm and a width of 1700-2000mm, and comprises the following chemical components in percentage by mass: c: less than or equal to 0.0035 percent, less than or equal to 0.02 percent of Si, Mn: 0.06-0.16%, P is less than or equal to 0.02%, S is less than or equal to 0.015%, Als: 0.020-0.060%, Ti: 0.04-0.06%, Nb: 0.01 to 0.03 percent.
A production method of high-performance wide-width IF steel comprises hot rolling, cold rolling and annealing, wherein the thickness of a finished product is 0.6-0.8mm, the width is 1700-2000mm, and the chemical components comprise the following components in percentage by mass: c: less than or equal to 0.0035 percent, less than or equal to 0.02 percent of Si, Mn: 0.06-0.16%, P is less than or equal to 0.02%, S is less than or equal to 0.015%, Als: 0.020-0.060%, Ti: 0.04-0.06%, Nb: 0.01 to 0.03 percent;
hot rolling: the heating temperature of the plate blank is 1220-1290 ℃, the finishing temperature is 890-930 ℃, and the coiling temperature is 700-730 ℃;
annealing: when the thickness of the finished product is 0.6-0.8mm and the width is 1700 plus or minus 1800mm, the temperature of the soaking section of the annealing furnace is 830 +/-5 ℃, the belt speed is 120 +/-5 m/min, the tension of the soaking section is 7.5-8KN, and the tension of the aging section is 6.5-7 KN; when the thickness of the finished product is 0.6-0.8mm and the width is 1800-1900mm, the temperature of the soaking section of the annealing furnace is 820 +/-5 ℃, the belt speed is 110 +/-5 m/min, the tension of the soaking section is 7.8-8.3KN, and the tension of the aging section is 6-6.5 KN; when the thickness of the finished product is 0.6-0.8mm and the width is 1900-2000mm, the temperature of the soaking section of the annealing furnace is 810 +/-5 ℃, the belt speed is 100 +/-5 m/min, the tension of the soaking section is 8.5-9KN, and the tension of the aging section is 5.8-6.3 KN.
The specific embodiment is as follows:
1. the chemical compositions and specifications of the continuous casting slabs for wide IF steel are shown in Table 1
TABLE 1
2. The parameters of the hot rolling process are shown in Table 2
TABLE 2
3. The cold rolling annealing process parameters are shown in Table 3
TABLE 3
4. Referring to the attached figure 1, the furnace roller convexity is not changed in the production process, and the furnace roller profile convexity is as follows:
。
wherein: do is the diameter of the cylindrical part of the furnace roller; di is the diameter of the furnace roller taper part; le is the length of the furnace roller taper part.
5. The mechanical properties of the wide IF steel products are shown in Table 4
TABLE 4
Through the performance inspection of the examples 1 to 6, the elongation after fracture meets the requirement of more than or equal to 48 percent, and the plastic strain ratio
r90Meets the requirement of more than or equal to 3.0. And the production is stable, and the phenomena of deviation and thermal buckling are avoided.
Claims (4)
1. A production method of high-performance wide-width IF steel comprises hot rolling, cold rolling and annealing, and is characterized in that: the thickness of the finished product is 0.6-0.8mm, the width is 1600-1900mm, and the mass percentages of the chemical components are as follows: c: less than or equal to 0.0035 percent, less than or equal to 0.02 percent of Si, Mn: 0.06-0.16%, P is less than or equal to 0.02%, S is less than or equal to 0.015%, Als: 0.020-0.060%, Ti: 0.06-0.08%, and the balance of iron;
hot rolling: the slab heating temperature is 1220-;
annealing: when the thickness of the finished product is 0.6-0.8mm and the width is 1600-1700mm, the temperature of the soaking section of the annealing furnace is 840 +/-5 ℃, the belt speed is 200 +/-5 m/min, the tension of the soaking section is 7-7.5kN, and the tension of the aging section is 6-6.5 kN; when the thickness of the finished product is 0.6-0.8mm and the width is 1700-1800mm, the temperature of the soaking section of the annealing furnace is 830 +/-5 ℃, the belt speed is 180 +/-5 m/min, the tension of the soaking section is 7.5-8kN, and the tension of the aging section is 5.8-6.3 kN; when the thickness of the finished product is 0.6-0.8mm and the width is 1800-1900mm, the temperature of the soaking section of the annealing furnace is 820 +/-5 ℃, the belt speed is 160 +/-5 m/min, the tension of the soaking section is 8-8.5kN, and the tension of the aging section is 5.5-6 kN.
2. The method for producing the IF steel with high performance and wide sheet width as claimed in claim 1, wherein the finished IF steel with high performance and wide sheet width has a post-fracture elongation of 48% or more and a plastic strain ratio r90≥3.0。
3. A production method of high-performance wide-width IF steel comprises hot rolling, cold rolling and annealing, and is characterized in that: the thickness of the finished product is 0.6-0.8mm, the width is 1700-2000mm, and the mass percentages of the chemical components are as follows: c: less than or equal to 0.0035 percent, less than or equal to 0.02 percent of Si, Mn: 0.06-0.16%, P is less than or equal to 0.02%, S is less than or equal to 0.015%, Als: 0.020-0.060%, Ti: 0.04-0.06%, Nb: 0.01-0.03%, and the balance of iron;
hot rolling: the heating temperature of the plate blank is 1220-1290 ℃, the finishing temperature is 890-930 ℃, and the coiling temperature is 700-730 ℃;
annealing: when the thickness of the finished product is 0.6-0.8mm and the width is 1700-1800mm, the temperature of the soaking section of the annealing furnace is 830 +/-5 ℃, the belt speed is 120 +/-5 m/min, the tension of the soaking section is 7.5-8kN, and the tension of the aging section is 6.5-7 kN; when the thickness of the finished product is 0.6-0.8mm and the width is 1800-1900mm, the temperature of the soaking section of the annealing furnace is 820 +/-5 ℃, the belt speed is 110 +/-5 m/min, the tension of the soaking section is 7.8-8.3kN, and the tension of the aging section is 6-6.5 kN; when the thickness of the finished product is 0.6-0.8mm and the width is 1900-2000mm, the temperature of the soaking section of the annealing furnace is 810 +/-5 ℃, the belt speed is 100 +/-5 m/min, the tension of the soaking section is 8.5-9kN, and the tension of the aging section is 5.8-6.3 kN.
4. The method for producing the IF steel with high performance and wide sheet width as claimed in claim 3, wherein the finished IF steel with high performance and wide sheet width has a post-fracture elongation of 48% or more and a plastic strain ratio r90≥3.0。
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