CN113584403A - Process method for improving deep drawing performance of hot-dip galvanized IF steel - Google Patents

Process method for improving deep drawing performance of hot-dip galvanized IF steel Download PDF

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CN113584403A
CN113584403A CN202110866945.1A CN202110866945A CN113584403A CN 113584403 A CN113584403 A CN 113584403A CN 202110866945 A CN202110866945 A CN 202110866945A CN 113584403 A CN113584403 A CN 113584403A
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hot
rolled
steel substrate
steel
cooling
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熊邦汇
乔培生
谢龙
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Shenzhen Huamei Metal Material Technology Co ltd
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Shenzhen Huamei Metal Material Technology 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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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
    • 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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0436—Cold 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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing 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
    • C22C38/02—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
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

The invention provides a process method for improving the deep drawing performance of hot-dip galvanized IF steel, which comprises the steps of carrying out acid pickling and cold rolling treatment on a hot-rolled IF steel substrate; annealing the cold-rolled and formed hot-rolled IF steel substrate at the annealing temperature of 830 ℃ for 30-60 s; cooling the annealed hot-rolled IF steel substrate, wherein the cooling treatment comprises a fast cooling stage and a slow cooling stage, the cooling speed of the fast cooling stage is 10-15 ℃/s, and the cooling speed of the slow cooling stage is 3-5 ℃/s; and hot galvanizing the cooled hot-rolled IF steel substrate. The method properly prolongs the annealing heat preservation time, is favorable for improving the recrystallization process to form uniform and fine recrystallized grain structure on one hand, and is favorable for fully nucleating and properly growing the grains on the other hand, the grains are properly coarsened to avoid fine grain strengthening and reduce the yield strength, and the proper grain structure state can be obtained by adjusting the cooling speed, and the temperature can be reduced within a limited distance.

Description

Process method for improving deep drawing performance of hot-dip galvanized IF steel
Technical Field
The invention relates to the technical field of IF steel heat treatment, in particular to a process method for improving the deep drawing performance of hot-galvanized IF steel.
Background
IF steel is Interstitial-free (Interstitial-free) steel, which is abbreviated as IF steel, obtained by completely fixing Interstitial atoms such as C, N in ultra-low carbon steel into carbon nitride by using strong carbon nitride forming elements such as Ti and Nb.
At present, the domestic hot-dip galvanized IF steel mainly has two ways of improving deep drawing performance, one way is to continuously reduce C, N and other solid solution elements and optimize alloy components by adjusting the alloy components; the other is by adjusting the process, mainly hot rolling process, cold rolling reduction and annealing temperature. However, no matter how the front end is adjusted, the final structure state of the IF steel is the key factor for determining the galvanizing quality and deep drawing performance of the steel, so that the subsequent coarsening process of crystal grains is particularly important, and the prior art lacks the attention on the recrystallization annealing heat preservation time and the cooling speed, so that incomplete recrystallization or over-fine crystal grains, higher yield strength and reduced deep drawing performance are caused; and most of the prior annealing furnace radiant heating pipes used in steel mills are aged or repeatedly maintained, and the actual heating capacity is reduced to a set temperature, so that the annealing of the steel strip at a low temperature is incomplete and the stress release is insufficient.
Therefore, it is necessary to select the proper recrystallization holding time and the subsequent cooling speed.
Disclosure of Invention
In view of the above problems, embodiments of the present invention provide a process for improving the deep drawability of a hot dip galvanized IF steel, which overcomes or at least partially solves the above problems.
In one embodiment of the invention, a process method for improving deep drawing performance of hot-dip galvanized IF steel is provided, and the process method comprises the following steps:
selecting the following components in percentage by mass: less than or equal to 0.001 wt% of C, less than or equal to 0.002 wt% of N, less than or equal to 0.04 wt% of Ti, less than or equal to 0.007 wt% of S, less than or equal to 0.01 wt% of P, less than or equal to 0.09 wt% of Mn, less than or equal to 0.001 wt% of Si, less than or equal to 0.02 wt% of Al, and the balance of iron;
carrying out acid pickling and cold rolling treatment on the hot-rolled IF steel substrate;
annealing the cold-rolled and formed hot-rolled IF steel substrate at the annealing temperature of 830 ℃ for 30-60 s;
cooling the annealed hot-rolled IF steel substrate, wherein the cooling treatment comprises a fast cooling stage and a slow cooling stage, the cooling speed of the fast cooling stage is 10-15 ℃/s, and the cooling speed of the slow cooling stage is 3-5 ℃/s;
and hot galvanizing the cooled hot-rolled IF steel substrate.
Further, the step of performing acid pickling and cold rolling treatment on the hot-rolled IF steel substrate comprises uncoiling the hot-rolled IF steel substrate, wherein the linear speed of the hot-rolled IF steel substrate production line is 80 m/min.
Further, in the step of subjecting the hot-rolled IF steel substrate to pickling and cold rolling, the reduction of the cold rolling is 83%.
Further, the step of performing pickling cold rolling treatment on the hot-rolled IF steel substrate comprises the step of performing cold rolling treatment on the hot-rolled IF steel substrate with the initial thickness of 3.5mm to obtain the hot-rolled IF steel substrate with the final thickness of 0.6 mm.
Further, the step of cooling the annealed hot-rolled IF steel substrate comprises the steps of a fast cooling stage and a slow cooling stage, and comprises the following steps: performing quick cooling treatment on the annealed hot-rolled IF steel substrate by adopting 3 fans in the quick cooling stage;
and in the slow cooling stage, 2 fans are adopted to carry out slow cooling treatment on the annealed hot-rolled IF steel substrate.
Further, the step of cooling the annealed hot-rolled IF steel substrate further includes cooling the hot-rolled IF steel substrate to 460 ± 3 ℃.
Further, after the step of hot galvanizing the cooled hot-rolled IF steel substrate, the hot-rolled IF steel substrate after hot galvanizing is finished and wound to obtain a hot-galvanized IF steel coil, wherein the finishing elongation is 1.0%.
Further, the annealing holding time is 55 s.
Further, the cooling rate of the fast cooling stage is 15 ℃/s.
Further, the cooling rate of the slow cooling stage is 3 ℃/s.
The application has the following advantages:
in the embodiment of the application, the mass percentages are selected as follows: less than or equal to 0.001 wt% of C, less than or equal to 0.002 wt% of N, less than or equal to 0.04 wt% of Ti, less than or equal to 0.007 wt% of S, less than or equal to 0.01 wt% of P, less than or equal to 0.09 wt% of Mn, less than or equal to 0.001 wt% of Si, less than or equal to 0.02 wt% of Al, and the balance of iron; carrying out acid pickling and cold rolling treatment on the hot-rolled IF steel substrate; annealing the cold-rolled and formed hot-rolled IF steel substrate at the annealing temperature of 830 ℃ for 30-60 s; cooling the annealed hot-rolled IF steel substrate, wherein the cooling treatment comprises a fast cooling stage and a slow cooling stage, the cooling speed of the fast cooling stage is 10-15 ℃/s, and the cooling speed of the slow cooling stage is 3-5 ℃/s; and hot galvanizing the cooled hot-rolled IF steel substrate. In the method, the proper extension of the annealing and heat preservation time is beneficial to improving the recrystallization process and forming uniform and fine recrystallized grain structures on the one hand, and is beneficial to full nucleation and proper growth of grains on the other hand, the proper coarsening of the grains can avoid fine grain strengthening, and the yield strength is properly reduced; by adjusting the cooling speed in the fast cooling stage and the slow cooling stage, the uniform and fine grain structure is prevented from growing rapidly and can be stored in a limited time period by fast cooling of the hot-rolled IF steel substrate during annealing, a proper grain structure state can be obtained, the temperature can be reduced within a limited distance, the temperature of the hot-rolled IF steel substrate entering a zinc pot is controlled within a proper range, the plate shape and the surface quality are not influenced, and the subsequent galvanizing process is facilitated; the invention optimizes the grain structure state of the IF steel after recrystallization and annealing by prolonging the annealing heat preservation time and adjusting the cooling speed, improves the deep drawing performance, and can avoid the phenomena of punching crack or wrinkling in subsequent deep processing.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A process method for improving deep drawing performance of hot-dip galvanized IF steel specifically comprises the following steps:
s100, selecting the following components in percentage by mass: c is less than or equal to 0.001 wt%, N is less than or equal to 0.002 wt%, Ti is less than or equal to 0.04 wt%, S is less than or equal to 0.007 wt%, P is less than or equal to 0.01 wt%, Mn is less than or equal to 0.09 wt%, Si is less than or equal to 0.001 wt%, Alt is less than or equal to 0.02 wt%, and the balance is iron and inevitable impurities;
s200, carrying out acid pickling and cold rolling treatment on the hot-rolled IF steel substrate;
s300, annealing the cold-rolled and formed hot-rolled IF steel substrate at the annealing temperature of 830 ℃ for 30-60S;
s400, cooling the annealed hot-rolled IF steel substrate, wherein the cooling treatment comprises a fast cooling stage and a slow cooling stage, the cooling speed of the fast cooling stage is 10-15 ℃/S, and the cooling speed of the slow cooling stage is 3-5 ℃/S;
s500, hot galvanizing is carried out on the cooled hot-rolled IF steel substrate.
In the embodiment of the application, the mass percentages are selected as follows: c is less than or equal to 0.001 wt%, N is less than or equal to 0.002 wt%, Ti is less than or equal to 0.04 wt%, S is less than or equal to 0.007 wt%, P is less than or equal to 0.01 wt%, Mn is less than or equal to 0.09 wt%, Si is less than or equal to 0.001 wt%, Alt is less than or equal to 0.02 wt%, and the balance is iron and inevitable impurities; carrying out acid pickling and cold rolling treatment on the uncoiled hot-rolled IF steel substrate; annealing the cold-rolled and formed hot-rolled IF steel substrate at the annealing temperature of 830 ℃ for 30-60 s; cooling the annealed hot-rolled IF steel substrate, wherein the cooling treatment comprises a fast cooling stage and a slow cooling stage, the cooling speed of the fast cooling stage is 10-15 ℃/s, and the cooling speed of the slow cooling stage is 3-5 ℃/s; and hot galvanizing the cooled hot-rolled IF steel substrate. In the method, the proper extension of the annealing and heat preservation time is beneficial to improving the recrystallization process and forming uniform and fine recrystallized grain structures on the one hand, and is beneficial to full nucleation and proper growth of grains on the other hand, the proper coarsening of the grains can avoid fine grain strengthening, and the yield strength is properly reduced; by adjusting the cooling speed in the fast cooling stage and the slow cooling stage, the uniform and fine grain structure is prevented from growing rapidly and can be stored in a limited time period by fast cooling of the hot-rolled IF steel substrate during annealing, a proper grain structure state can be obtained, the temperature can be reduced within a limited distance, the temperature of the hot-rolled IF steel substrate entering a zinc pot is controlled within a proper range, the plate shape and the surface quality are not influenced, and the subsequent galvanizing process is facilitated; the invention optimizes the grain structure state of the IF steel after recrystallization and annealing by prolonging the annealing heat preservation time and adjusting the cooling speed, improves the deep drawing performance, and can avoid the phenomena of punching crack or wrinkling in subsequent deep processing.
Next, the process for improving the deep drawability of the hot dip galvanized IF steel in the present exemplary embodiment will be further described.
In an embodiment of the present invention, the step of performing acid pickling and cold rolling treatment on the hot-rolled IF steel substrate includes uncoiling the hot-rolled IF steel substrate, wherein a linear speed of a production line of the hot-rolled IF steel substrate is 80m/min, so that stable transmission of the hot-rolled IF steel substrate is ensured during acid pickling and cold rolling, and the balance of rolling reduction of each part of the hot-rolled IF steel substrate is ensured, thereby ensuring that the surface of the hot-rolled IF steel substrate is smooth.
In an embodiment of the invention, in the step of performing acid pickling and cold rolling treatment on the hot-rolled IF steel substrate, the reduction of the cold rolling is 83%, so that the thickness unevenness of the hot-rolled IF steel substrate can be reduced, the defects of wave-shaped bending, buckling and the like can be eliminated, and the precision of the hot-rolled IF steel substrate can be improved.
In an embodiment of the present invention, the step of performing acid pickling and cold rolling treatment on the hot-rolled IF steel substrate includes performing cold rolling treatment on the hot-rolled IF steel substrate with an initial thickness of 3.5mm to obtain a hot-rolled IF steel substrate with a final thickness of 0.6 mm;
in an embodiment of the present invention, the cooling treatment of the annealed hot-rolled IF steel substrate, the cooling treatment including a fast cooling stage and a slow cooling stage, includes: performing quick cooling treatment on the annealed hot-rolled IF steel substrate by adopting 3 fans in the quick cooling stage;
and in the slow cooling stage, 2 fans are adopted to carry out slow cooling treatment on the annealed hot-rolled IF steel substrate.
It should be noted that 3 fans are started for accelerated cooling in the fast cooling stage, 2 fans are adopted for accelerated cooling in the slow cooling stage, cooling at different speeds is respectively carried out on the hot-rolled IF steel substrate, uniform and fine grain structures are prevented from rapidly growing up and being stored in the annealing process through fast cooling, a proper grain structure state can be obtained, the temperature can be reduced within a limited distance, stress is eliminated through slow cooling, the strength and the hardness of the hot-rolled IF steel substrate are ensured, and the fans are power-adjustable fans, and the power of the fans can be adjusted so as to control the cooling speed of the annealed hot-rolled IF steel substrate.
In an embodiment of the present invention, the step of cooling the annealed hot-rolled IF steel substrate further includes cooling the hot-rolled IF steel substrate to 460 ± 3 ℃, so as to ensure that the optimal temperature of the hot-rolled IF steel substrate entering a zinc pot during a hot galvanizing process is 460 ± 3 ℃, thereby enabling the coating layer to have good adhesion.
In an embodiment of the present invention, after the step of hot galvanizing the cooled hot-rolled IF steel substrate, the hot-rolled IF steel substrate after hot galvanizing is finished and wound to obtain a hot-galvanized IF steel coil, wherein the finishing elongation is 1.0%.
In an embodiment of the invention, the annealing heat preservation time is 55s, the cooling speed in the rapid cooling stage is 15 ℃/s, and the cooling speed in the slow cooling stage is 3 ℃/s, so that the optimal yield ratio can be obtained, and the requirement of deep drawing performance of the hot-rolled IF steel substrate is met.
In a specific embodiment, the process for improving the deep drawing performance of the hot-dip galvanized IF steel comprises the following steps:
the first step is as follows: selecting the following components in percentage by mass: c0.001wt%, N0.002wt%, Ti 0.04wt%, S0.007wt%, P0.01wt%, Mn 0.09wt%, Si 0.001wt%, Alt 0.02wt%, and the balance of iron and inevitable impurities;
the second step is that: carrying out acid washing and cold rolling treatment on the uncoiled hot-rolled IF steel substrate, wherein the total reduction in the cold rolling process is 83%, the linear speed of the hot-rolled IF steel substrate is 80m/min, the initial thickness is 3.5mm, and the final thickness is 0.6 mm;
the third step: annealing the cold-rolled and formed hot-rolled IF steel substrate at the annealing temperature of 830 ℃ for 36 s;
the fourth step: cooling the annealed hot-rolled IF steel substrate by using 3 fans, wherein the cooling treatment comprises a fast cooling stage and a slow cooling stage, the cooling speed in the fast cooling stage is controlled at 12 ℃/s, the cooling speed in the slow cooling stage is controlled at 4 ℃/s, and the temperature of the substrate in a zinc pot is controlled at 460 ℃;
the fifth step: hot galvanizing the cooled hot-rolled IF steel substrate;
and a sixth step: and (3) finishing and rolling the hot-galvanized IF steel substrate, wherein the finishing elongation is controlled to be 1.0%, and the hot-galvanized IF steel coil is obtained.
And (3) analyzing a test result: by adopting the optimized process, the obtained microstructure is a pure ferrite structure, the crystal grains are more uniform, the tensile strength is 275-280 MPa, the yield strength is 143-150 MPa, the elongation is 48-50%, and the yield ratio is 0.51-0.55, so that the requirement on deep drawing performance can be better met.
In another specific embodiment, the process method for improving the deep drawing performance of the hot-dip galvanized IF steel comprises the following steps:
the first step is as follows: selecting the following components in percentage by mass: c0.001wt%, N0.002wt%, Ti 0.04wt%, S0.007wt%, P0.01wt%, Mn 0.09wt%, Si 0.001wt%, Alt 0.02wt%, and the balance of iron and inevitable impurities;
the second step is that: carrying out acid washing and cold rolling treatment on the uncoiled hot-rolled IF steel substrate, wherein the total reduction in the cold rolling process is 83%, the linear speed of the hot-rolled IF steel substrate is 80m/min, the initial thickness is 3.5mm, and the final thickness is 0.6 mm;
the third step: annealing the cold-rolled and formed hot-rolled IF steel substrate at the annealing temperature of 830 ℃ for 55 s;
the fourth step: cooling the annealed hot-rolled IF steel substrate by using 3 fans, wherein the cooling treatment comprises a fast cooling stage and a slow cooling stage, the cooling speed in the fast cooling stage is controlled at 12 ℃/s, the cooling speed in the slow cooling stage is controlled at 4 ℃/s, and the temperature of the substrate in a zinc pot is controlled at 460 ℃;
the fifth step: hot galvanizing the cooled hot-rolled IF steel substrate;
and a sixth step: and (3) finishing and rolling the hot-galvanized IF steel substrate, wherein the finishing elongation is controlled to be 1.0%, and the hot-galvanized IF steel coil is obtained.
And (3) analyzing a test result: by adopting the optimized process, the obtained microstructure is a pure ferrite structure, the crystal grains are more uniform, the tensile strength is 265-275 MPa, the yield strength is 140-143 MPa, the elongation is 50-52%, and the yield ratio is 0.51-0.54, so that the requirement on deep drawing performance can be better met.
In another specific embodiment, the process method for improving the deep drawing performance of the hot-dip galvanized IF steel comprises the following steps:
the first step is as follows: selecting the following components in percentage by mass: c0.001wt%, N0.002wt%, Ti 0.04wt%, S0.007wt%, P0.01wt%, Mn 0.09wt%, Si 0.001wt%, Alt 0.02wt%, and the balance of iron and inevitable impurities;
the second step is that: carrying out acid washing and cold rolling treatment on the uncoiled hot-rolled IF steel substrate, wherein the total reduction in the cold rolling process is 83%, the linear speed of the hot-rolled IF steel substrate is 80m/min, the initial thickness is 3.5mm, and the final thickness is 0.6 mm;
the third step: annealing the cold-rolled and formed hot-rolled IF steel substrate at the annealing temperature of 830 ℃ for 36 s;
the fourth step: cooling the annealed hot-rolled IF steel substrate by using 3 fans, wherein the cooling treatment comprises a fast cooling stage and a slow cooling stage, the cooling speed in the fast cooling stage is controlled at 15 ℃/s, the cooling speed in the slow cooling stage is controlled at 3 ℃/s, and the temperature of the substrate in a zinc pot is controlled at 460 ℃;
the fifth step: hot galvanizing the cooled hot-rolled IF steel substrate;
and a sixth step: and (3) finishing and rolling the hot-galvanized IF steel substrate, wherein the finishing elongation is controlled to be 1.0%, and the hot-galvanized IF steel coil is obtained.
And (3) analyzing a test result: by adopting the optimized process, the obtained microstructure is a pure ferrite structure, the crystal grains are more uniform, the tensile strength is 275-285 MPa, the yield strength is 142-148 MPa, the elongation is 46-49%, the yield ratio is 0.50-0.54, and the requirement on deep drawing performance can be better met.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The technical method for improving the deep drawing performance of the hot-dip galvanized IF steel is described in detail, specific examples are applied in the technical method for improving the deep drawing performance of the hot-dip galvanized IF steel to explain the principle and the implementation mode of the hot-dip galvanized IF steel, and the description of the specific examples is only used for helping to understand the method and the core idea of the hot-dip galvanized IF steel; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (10)

1. A process method for improving the deep drawing performance of hot-dip galvanized IF steel is characterized by comprising the following steps:
selecting the following components in percentage by mass: less than or equal to 0.001 wt% of C, less than or equal to 0.002 wt% of N, less than or equal to 0.04 wt% of Ti, less than or equal to 0.007 wt% of S, less than or equal to 0.01 wt% of P, less than or equal to 0.09 wt% of Mn, less than or equal to 0.001 wt% of Si, less than or equal to 0.02 wt% of Al, and the balance of iron;
carrying out acid pickling and cold rolling treatment on the hot-rolled IF steel substrate;
annealing the cold-rolled and formed hot-rolled IF steel substrate at the annealing temperature of 830 ℃ for 30-60 s;
cooling the annealed hot-rolled IF steel substrate, wherein the cooling treatment comprises a fast cooling stage and a slow cooling stage, the cooling speed of the fast cooling stage is 10-15 ℃/s, and the cooling speed of the slow cooling stage is 3-5 ℃/s;
and hot galvanizing the cooled hot-rolled IF steel substrate.
2. The process method for improving the deep drawability of hot-dip galvanized IF steel according to claim 1, wherein the step of performing pickling cold rolling treatment on the hot-rolled IF steel substrate comprises uncoiling the hot-rolled IF steel substrate, wherein the line speed of the hot-rolled IF steel substrate production line is 80 m/min.
3. The process method for improving the deep drawability of hot-dip galvanized IF steel according to claim 1, wherein the reduction of cold rolling in the step of pickling and cold rolling the hot-rolled IF steel substrate is 83%.
4. The process for improving the deep drawability of hot-dip galvanized IF steel according to claim 1, wherein the step of subjecting the hot-rolled IF steel substrate to pickling cold rolling comprises subjecting the hot-rolled IF steel substrate having an initial thickness of 3.5mm to cold rolling to obtain a hot-rolled IF steel substrate having a final thickness of 0.6 mm.
5. The process method for improving the deep drawing performance of hot-dip galvanized IF steel according to claim 1, wherein the step of cooling the annealed hot-rolled IF steel substrate comprises the steps of a fast cooling stage and a slow cooling stage, and comprises the following steps of: performing quick cooling treatment on the annealed hot-rolled IF steel substrate by adopting 3 fans in the quick cooling stage;
and in the slow cooling stage, 2 fans are adopted to carry out slow cooling treatment on the annealed hot-rolled IF steel substrate.
6. The process for improving the deep drawability of hot dip galvanized IF steel according to claim 1, wherein said step of cooling the annealed hot rolled IF steel substrate further comprises cooling the hot rolled IF steel substrate to a temperature of 460 ± 3 ℃.
7. The process method for improving the deep drawability of hot-dip galvanized IF steel according to claim 1, wherein after the step of hot-dip galvanizing the cooled hot-rolled IF steel substrate, the process method further comprises the steps of finishing and rolling the hot-dip galvanized IF steel substrate to obtain the hot-dip galvanized IF steel coil, wherein the finishing elongation is 1.0%.
8. The process method for improving the deep drawing performance of hot-dip galvanized IF steel according to claim 1, wherein the annealing holding time is 55 s.
9. The process method for improving the deep drawing performance of hot-dip galvanized IF steel according to claim 1, wherein the cooling rate in the fast cooling stage is 15 ℃/s.
10. The process method for improving the deep drawability of hot-dip galvanized IF steel according to claim 1, wherein the cooling rate in the slow cooling stage is 3 ℃/s.
CN202110866945.1A 2021-07-29 2021-07-29 Process method for improving deep drawing performance of hot-dip galvanized IF steel Pending CN113584403A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103510002A (en) * 2012-06-29 2014-01-15 上海梅山钢铁股份有限公司 Gapless atom cold-rolled hot-galvanized steel plate and production method thereof
CN103627957A (en) * 2013-10-14 2014-03-12 首钢总公司 Steel for CR4 hot dip galvanized automobile sheets and production method thereof
CN112126881A (en) * 2020-10-12 2020-12-25 马鞍山钢铁股份有限公司 Deep-drawing-level hot-dip coated steel plate produced by short-time annealing and production method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103510002A (en) * 2012-06-29 2014-01-15 上海梅山钢铁股份有限公司 Gapless atom cold-rolled hot-galvanized steel plate and production method thereof
CN103627957A (en) * 2013-10-14 2014-03-12 首钢总公司 Steel for CR4 hot dip galvanized automobile sheets and production method thereof
CN112126881A (en) * 2020-10-12 2020-12-25 马鞍山钢铁股份有限公司 Deep-drawing-level hot-dip coated steel plate produced by short-time annealing and production method thereof

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Application publication date: 20211102