CN113088794B - IF steel hot-dip galvanized steel sheet with low delta r value and preparation method thereof - Google Patents
IF steel hot-dip galvanized steel sheet with low delta r value and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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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
- 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
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
Abstract
The invention belongs to the technical field of metallurgy, and particularly relates to an IF steel hot-dip galvanized steel plate with a low delta r value and a preparation method thereof. The invention aims to provide an IF steel hot-dip galvanized steel sheet with a low delta r value and a preparation method thereof. The preparation method comprises the processes of smelting, hot rolling, acid rolling, annealing and hot galvanizing. Aiming at the IF steel hot-dip galvanized steel plate, the IF steel hot-dip galvanized steel plate with higher strength and less than 0.12 delta r is prepared by strictly controlling parameters in hot rolling, acid rolling and hot-dip galvanizing processes.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to an IF steel hot-dip galvanized steel plate with a low delta r value and a preparation method thereof.
Background
With the rapid development of national economic construction in China, the market demand for high-performance hot-dip galvanized steel sheets is continuously improved, and the hot-dip galvanized steel sheets with high stamping forming performance have become targets pursued by various enterprises on the premise of ensuring other performances, and especially have great attention in the industries of automobiles and household appliances. Among them, typical patents in the prior art for improving the press formability of hot dip galvanized steel include:
patent CN103958712A discloses a high-strength hot-dip galvanized steel sheet with excellent deep drawability and a manufacturing method thereof, wherein the steel sheet comprises the following chemical components in percentage by weight: c: 0.010-0.04%, Si: 1.0-1.5%, Mn: 1.0-3.0%, P: 0.005-0.1%, S: < 0.01%, sol.a1: 0.005-0.5%, N: < 0.01%, Nb: 0.010-0.05%, Ti: 0.015 to 0.120%, wherein the content (% by mass) of Nb and C in the steel satisfies the relationship (Nb/93)/(C/12) <0.20, further satisfies 0.005< C ≦ 0.020, and the balance is Fe and unavoidable impurities. The steel sheet has an average r value of 1.30 or more, and has an in-plane anisotropy (Δ r) of r value of 0.20 or less in absolute value, whereby excellent deep drawability and high strength of TS440MPa or more can be achieved.
Although the average r value of the galvanized steel sheet disclosed in the above patent is not less than 1.30 and the anisotropy (Δ r) is less than 0.2, the stamping forming performance of the galvanized steel sheet still needs to be further improved, and the requirement of the existing market on the high-performance galvanized steel sheet can be met.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a preparation method of an IF steel hot-dip galvanized steel plate with a low delta r value, which comprises the following steps:
(1) smelting: smelting into a casting blank according to chemical components of the IF steel; the IF steel comprises the following chemical components in percentage by weight: c: less than or equal to 0.005%, Si: less than or equal to 0.02 percent, Mn: 0.10-0.15%, P: 0.005-0.015%, S: 0.005-0.015%, Ti: 0.050-0.080%, Als: 0.020-0.070%, and the balance of Fe and inevitable impurities;
(2) a hot rolling procedure: heating a casting blank, removing phosphorus, roughly rolling, finely rolling, cooling and coiling to obtain a hot-rolled coil; wherein the start rolling temperature of finish rolling is 910-940 ℃, the finish rolling temperature is 770-800 ℃, and the coiling temperature is 610-650 ℃;
(3) acid rolling process: pickling the hot rolled coil and then cold rolling the pickled hot rolled coil into thin strip steel;
(4) annealing and hot galvanizing working procedures: annealing and hot galvanizing the thin strip steel to prepare a hot galvanized steel plate; in the hot galvanizing procedure, after annealing is finished, the temperature is quickly cooled to 440-460 ℃ of a zinc pool furnace nose, the quick cooling rate is 10-50 ℃/s, the galvanizing time is 7-30 s, and after galvanizing, the zinc pool furnace nose is cooled to room temperature at the final cooling rate of 5-10 ℃/s.
Preferably, in the smelting process in the step (1), the chemical components of the IF steel comprise the following components in percentage by weight: c: less than or equal to 0.005%, Si: less than or equal to 0.02 percent, Mn: 0.10-0.14%, P: 0.005-0.013%, S: 0.005-0.013%, Ti: 0.055-0.075%, Als: 0.030 to 0.065 percent, and the balance of Fe and inevitable impurities.
Wherein, in the hot rolling procedure in the step (2), the steel is heated to 1110-1150 ℃, the furnace time is 200-260 min, and 5-pass rough rolling is adopted.
Wherein, in the acid rolling procedure in the step (3), the cold rolling reduction is 75-85%.
Wherein, in the annealing procedure in the step (4), the heating temperature is 690-760 ℃, the soaking temperature is 780-810 ℃, and the slow cooling temperature is 550-600 ℃.
Wherein, in the hot galvanizing procedure in the step (4), the dew point temperature of the protective atmosphere in the furnace is-25 to-60 ℃.
Has the advantages that: aiming at the IF steel hot-dip galvanized steel plate, the IF steel hot-dip galvanized steel plate with higher strength and less than 0.12 delta r is prepared by strictly controlling parameters in hot rolling, acid rolling and hot-dip galvanizing processes. The IF steel hot dip galvanized steel sheet R of the inventionp0.2130-160 MPa, tensile strength 280-330 MPa, elongation more than or equal to 45.0 percent, r90≥2.4，n90The preparation method has the advantages of simple preparation process, low cost and low energy consumption, and r is more than or equal to 0.23 and more than or equal to 2.1.
Detailed Description
The invention provides a preparation method of an IF steel hot-dip galvanized steel sheet with a low delta r value, which comprises the following steps:
(1) smelting: smelting into a casting blank according to chemical components of the IF steel, wherein the thickness of the casting blank is 200 mm;
(2) a hot rolling procedure: heating the casting blank to 1110-1150 ℃, keeping the temperature in the furnace for 200-260 min, then carrying out rough rolling, wherein the rough rolling adopts 5-pass rolling, the total phosphorus removal of the whole length is realized, a heat preservation cover is used in the rolling process, and the thickness of the intermediate plate blank after the rough rolling is 39-43 mm; carrying out finish rolling after rough rolling, wherein the start rolling temperature of the finish rolling is 910-940 ℃, and the finish rolling temperature is 770-800 ℃; naturally cooling to 610-650 ℃ after finish rolling, and coiling to obtain a hot rolled coil, wherein the thickness of the steel plate is 3.5 mm;
(3) acid rolling process: pickling the hot rolled coil, and then cold rolling the pickled hot rolled coil into thin strip steel, wherein the cold rolling reduction rate is 75-85%;
(4) annealing and hot galvanizing working procedures: annealing and hot galvanizing the cold-rolled thin strip steel to prepare a hot galvanized steel plate; the annealing process comprises three stages of heating, soaking and slow cooling, wherein the heating temperature is 690-760 ℃, the soaking temperature is 780-810 ℃, and the slow cooling temperature is 550-600 ℃; the heating stage aims to enable the slab to have a buffering process to enter soaking, the soaking stage is the actual annealing stage, and the slow cooling stage aims to enable the slab to have a buffering process to carry out hot galvanizing, so that the quality of the slab is guaranteed.
In the hot galvanizing procedure, the dew point temperature of the protective atmosphere in the furnace is-25 to-60 ℃, the temperature of the furnace nose of the zinc pool is quickly cooled to 440 to 460 ℃ after annealing, the quick cooling rate is 10 to 50 ℃/s, the galvanizing time is 7 to 30s, and the temperature is cooled to the room temperature at the final cooling rate of 5 to 10 ℃/s after galvanizing.
The value Δ r represents the change in the anisotropy coefficient r with direction in the sheet surface, which results in a difference in sidewall height (called a ledge) when the cylindrical cup is press formed. The magnitude of the value Δ r determines the extent of formation of the upper lug of the cup-shaped drawing part.
The Δ r value is defined as: Δ r ═ r0-2r45+r90)/2
In the formula, subscripts 0, 45, and 90 indicate angles between the orientations of the uniaxial tensile specimens and the sheet rolling direction.
The larger the Δ r value, the more severe the anisotropy in the sheet surface, which is manifested by the uneven edges of the drawn piece forming lugs and the uneven wall thickness aggravating the quality of the formed piece. Δ r > 0, the draw piece lugs are in the 0 ° and 90 ° directions; Δ r <0, and the drawing piece lug is in the 45 ° direction.
The plate material has an important effect on the rectangular drawing piece relative to the direction of anisotropy, and the direction with a large r value is preferably pointed to the four corners of the rectangle, and the four corners are formed by requiring the real drawing performance with the large r value. The maximum r value of most low-carbon aluminum killed steel cold-rolled steel sheets is perpendicular to the rolling direction, so that a large amount of waste materials can be caused when the rectangular drawing part blank is placed in the four-angle mode in the rolling direction. On the other hand, IF steel sheets are generally suitable for rectangular drawn parts because they have a large r value in the direction of 45 ° to the rolling direction. The IF steel has the characteristics of low strength, high elongation and no aging, and the material in all directions flows uniformly during stamping, so that the anisotropy is good. Therefore, the chemical components of the IF steel are selected to be smelted into a casting blank; the IF steel comprises the following chemical components in percentage by weight: c: less than or equal to 0.005%, Si: less than or equal to 0.02 percent, Mn: 0.10-0.15%, P: 0.005-0.015%, S: 0.005-0.015%, Ti: 0.050-0.080%, Als: 0.020-0.070%, and the balance of Fe and inevitable impurities.
Preferably, the chemical composition of the IF steel comprises the following components in percentage by weight: c: less than or equal to 0.005%, Si: less than or equal to 0.02 percent, Mn: 0.10-0.14%, P: 0.005-0.013%, S: 0.005-0.013%, Ti: 0.055-0.075%, Als: 0.030 to 0.065 percent, and the balance of Fe and inevitable impurities.
In the hot rolling procedure, the rough rolling aims at carrying out austenite deformation at low temperature, so that a casting blank is heated to 1110-1150 ℃ for 200-260 min in a furnace, then rough rolling is carried out, 5-pass rolling is adopted in the rough rolling, phosphorus is removed in the whole length, and a heat preservation cover is used in the rolling process.
In the hot rolling process of the invention, the rolling start temperature of finish rolling is controlled to be 910-940 ℃ in order to deform in a ferrite region and obtain a deformed hot rolled structure. The proportion of the {111} texture in a hot rolling state can be obviously improved when the low-temperature finish rolling temperature is 770-800 ℃, texture inheritance is obtained in a cold rolling process, and more {111} textures are generated, so that the delta r value is favorable.
Deformation is further accumulated in the acid rolling process, and a uniform structure is obtained after annealing.
The dew point temperature of the protective atmosphere in the furnace is a mark of the water content in the protective gas in the furnace, and the surface of the strip steel is oxidized when the temperature is too high; the temperature is too low, the oxidation reduction of the surface of the strip steel is not thorough, and the final surface quality is poor, so the dew point temperature of the protective atmosphere in the furnace is-25 to-60 ℃.
The heating temperature is set according to the soaking temperature and the self temperature in the furnace, if the temperature is too low, the temperature in the furnace is reduced, and the realization is difficult; the temperature is too high, which directly influences the requirement of the subsequent soaking temperature, so the heating temperature in the annealing process is 690-760 ℃.
The soaking temperature is determined according to the recrystallization temperature range of the strip steel, the temperature is too low, the tissue of the strip steel is not recrystallized, and the crack is easy to occur in the stamping process; the temperature is too high, the grains continue to grow excessively after recrystallization is finished, and orange peel cracking can occur in the stamping process, so the soaking temperature in the annealing process is 780-810 ℃.
The slow cooling temperature is set according to the product organization regulation and control and the temperature of the steel entering the zinc pot, the IF steel has no organization change, but the temperature of the zinc pot needs to be considered, the temperature of a furnace nose is determined according to the temperature of the zinc pot, and the temperature of the zinc pot is required to ensure the temperature of zinc liquid and the smooth operation of strip steel. The fast cooling speed is set according to the equipment of the unit, the temperature between the soaking temperature and the slow cooling temperature and the speed of the strip steel. The galvanizing time is set according to the speed of the strip steel. Therefore, comprehensively considered, the annealing process of the invention has the slow cooling temperature of 550-600 ℃, the annealing process is rapidly cooled to the temperature of 440-460 ℃ of the zinc pool nose after the annealing is finished, the rapid cooling rate CR1 is 10-50 ℃/s, the galvanizing time is 7-30 s, and the annealing process is cooled to the room temperature at the final cooling rate CR2 of 5-10 ℃/s after the galvanizing.
Examples
The invention is further illustrated and described by the following examples and comparative examples.
The following examples and comparative examples were smelted into a cast slab with a thickness of 200mm according to the chemical components in Table 1;
heating the casting blank, carrying out rough rolling after the furnace time is 255min, wherein the rough rolling adopts 5-pass rolling, the whole length and the whole number of phosphorus removal, a heat preservation cover is used in the rolling process, and the thickness of the intermediate plate blank after rough rolling is 42.0 mm;
after rough rolling, the plate blank is subjected to finish rolling, and after finish rolling, the plate blank is naturally cooled to a coiling temperature for coiling to obtain a steel plate with the thickness of 3.5 mm;
pickling the hot rolled coil, and cold rolling the hot rolled coil into thin strip steel, wherein the cold rolling reduction rate is 80.0 percent;
finally, obtaining the IF steel hot-dip galvanized steel plate through annealing and hot-dip galvanizing processes. Wherein the annealing temperature refers to a soaking temperature.
The specific process parameters of the hot rolling and annealing processes are shown in tables 2 and 3 respectively, and the mechanical properties of the obtained hot-dip galvanized steel sheet are shown in table 4.
TABLE 1 Hot-dip galvanized steel sheet chemical composition
| Numbering | C | Si | Mn | P | S | Als | Ti |
| Example 1 | 0.0025 | 0.004 | 0.12 | 0.010 | 0.007 | 0.035 | 0.060 |
| Example 2 | 0.0028 | 0.005 | 0.13 | 0.011 | 0.006 | 0.033 | 0.062 |
| Comparative example 1 | 0.0035 | 0.01 | 0.10 | 0.012 | 0.008 | 0.043 | 0.066 |
| Comparative example 2 | 0.0032 | 0.01 | 0.11 | 0.012 | 0.009 | 0.038 | 0.065 |
TABLE 2 Hot Rolling Main Process parameters
| Numbering | Heating temperature/. degree.C | Finish rolling temperature/. degree.C | Final Rolling temperature/. degree.C | Coiling temperature/. degree.C |
| Example 1 | 1130 | 920 | 779 | 650 |
| Example 2 | 1126 | 922 | 775 | 649 |
| Comparative example 1 | 1233 | 1035 | 934 | 757 |
| Comparative example 2 | 1238 | 1036 | 938 | 748 |
TABLE 3 main Process parameters for annealing
TABLE 4 mechanical Properties of hot-dip galvanized steel sheets
Claims (4)
1. The preparation method of the IF steel hot-dip galvanized steel sheet with the low delta r value is characterized by comprising the following steps of: the method comprises the following steps:
(1) smelting: smelting into a casting blank according to chemical components of the IF steel; the IF steel comprises the following chemical components in percentage by weight: c: less than or equal to 0.005%, Si: less than or equal to 0.02 percent, Mn: 0.10-0.15%, P: 0.005-0.015%, S: 0.005-0.015%, Ti: 0.050-0.080%, Als: 0.020-0.070%, and the balance of Fe and inevitable impurities;
(2) a hot rolling procedure: heating a casting blank, removing phosphorus, roughly rolling, finely rolling, cooling and coiling to obtain a hot-rolled coil; wherein, the casting blank is heated to 1110-1150 ℃, the furnace time is 200-260 min, 5-pass rough rolling is adopted, and finish rolling is carried out after the rough rolling; the start rolling temperature of finish rolling is 910-940 ℃, the finish rolling temperature is 770-800 ℃, and the coiling temperature is 610-650 ℃;
(3) acid rolling process: pickling the hot rolled coil and then cold rolling the pickled hot rolled coil into thin strip steel; wherein the cold rolling reduction rate is 75-85%;
(4) annealing and hot galvanizing working procedures: annealing and hot galvanizing the thin strip steel to prepare a hot galvanized steel plate; wherein in the annealing procedure, the heating temperature is 690-760 ℃, the soaking temperature is 780-810 ℃, and the slow cooling temperature is 550-600 ℃;
in the hot galvanizing procedure, after annealing, the steel sheet is quickly cooled to the temperature of 440-460 ℃ of a zinc pool furnace nose, the quick cooling rate is 10-50 ℃/s, the galvanizing time is 7-30 s, and after galvanizing, the steel sheet is cooled to the room temperature at the final cooling rate of 5-10 ℃/s.
2. The method for producing a low Δ r IF steel hot-dip galvanized steel sheet according to claim 1, characterized in that: in the smelting procedure of the step (1), the IF steel comprises the following chemical components in percentage by weight: c: less than or equal to 0.005%, Si: less than or equal to 0.02 percent, Mn: 0.10-0.14%, P: 0.005-0.013%, S: 0.005-0.013%, Ti: 0.055-0.075%, Als: 0.030 to 0.065 percent, and the balance of Fe and inevitable impurities.
3. The method for producing a hot-dip galvanized steel sheet made of an IF steel having a low Δ r value according to claim 1 or 2, characterized in that: in the hot galvanizing procedure in the step (4), the dew point temperature of the protective atmosphere in the furnace is-25 to-60 ℃.
4. A hot-dip galvanized IF steel sheet produced by the method for producing a low- Δ r IF steel sheet according to any one of claims 1 to 3.
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