Highly conductive fingerprint-resistant galvanized steel sheet and method for producing the same

Abstract

The present application relates to a kind of high-conductivity fingerprint-resistant galvanized sheet and its production method, strip steel chemical composition is C:0.001%~0.460%, Si:0.01%~0.80%, Mn:0.20%~2.60%, Cr:0.01%~0.50%, Mo:0.01%~0.25%, Ni≤0.10%, Cu≤0.10%, Nb≤0.500%, Ti≤0.300%, V≤0.008%, B≤0.005%, Al:0.015~0.045%, N≤0.004%, P≤0.080%, S≤0.012%, the rest is Fe and impurity;The surface of strip steel is plated with fingerprint-resistant film.For different thickness, different strength grade strip steel, accurately control the finishing rolling force, surface roughness and fingerprint-resistant film weight;Air-cooled film is used, and for different thickness of strip steel, accurately control the plate temperature after drying, the plate temperature after cooling in rising section, the plate temperature after cooling in horizontal section and the plate temperature after cooling in falling section;Finally, the surface conductivity of fingerprint-resistant galvanized sheet product is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of galvanized sheet production, and particularly relates to a high-conductivity fingerprint-resistant galvanized sheet and a production method thereof. BACKGROUND

[0002] Galvanized sheet products (component systems including Zn, Al-Zn-Mg, Al-Si, Zn-Al-Mg, etc.) are currently widely used in the field of industrial product manufacturing as a kind of sheet product with excellent corrosion resistance, which combines the excellent corrosion resistance and cathodic corrosion protection of zinc, aluminum, magnesium and other metal coatings, has excellent atmospheric corrosion resistance, and the corrosion resistance is 8-20 times that of cold-rolled steel sheet. In addition, the galvanized sheet also shows good painting and forming properties. Due to its good comprehensive performance, the development of galvanized sheet products is very rapid, and is widely used in the fields of building, automobile, agriculture, household appliances, photovoltaic support, etc. At present, the technology for controlling the surface quality stability of galvanized steel sheet is very mature, and there are various types of high-grade surface coating products. However, the research and attention on the surface conductivity of fingerprint-resistant passivated galvanized sheet are insufficient, which often causes poor welding during the use of the end user, seriously affecting the welding efficiency and welding quality, and thus causing the unqualified products to directly affect the quality cost.

[0003] To carry out the research on the quality stability control technology of fingerprint-resistant passivation film in the production process of high-conductivity fingerprint-resistant galvanized sheet, it is necessary to base on the related mechanism of the conductivity influencing factors of fingerprint-resistant passivation film of galvanized sheet, carry out the related research on the process and equipment improvement in the production process of fingerprint-resistant passivated galvanized sheet, and form a solution, so as to realize the stable control of the surface conductivity of fingerprint-resistant passivated galvanized sheet. This research has great significance for improving the production efficiency and product competitiveness of high-conductivity fingerprint-resistant galvanized sheet, meeting the growing market demand.

[0004] A Chinese patent application with the application number CN202022119511.9 discloses "a fingerprint-resistant galvanized steel sheet", which comprises a steel sheet substrate, an iron plating layer is arranged on the outer side of the steel sheet substrate, a zinc plating layer is arranged on the outer side of the iron plating layer, a fingerprint-resistant layer is arranged on the outer side of the zinc plating layer, and a nano anti-fingerprint oil layer is sprayed on the outer side of the fingerprint-resistant layer. The iron plating layer can reduce the surface defects of the steel sheet, greatly improve the quality of the steel sheet, has low production cost and no pollution; the setting of the fingerprint-resistant layer and the nano anti-fingerprint oil layer can make the galvanized steel sheet have double fingerprint-resistant effect, the nano anti-fingerprint oil layer is arranged on the outer side, the nano anti-fingerprint oil can form a transparent and hard protective film on the outer surface of the galvanized steel sheet, so that the surface of the galvanized steel sheet has good wear resistance and the galvanized steel sheet is more beautiful. However, it mainly relates to the production process of the fingerprint-resistant film of the galvanized steel sheet by electrostatic spraying, and does not involve the control method for improving the surface conductivity of the fingerprint-resistant galvanized sheet.

[0005] A Chinese patent application with the application number CN201210223570.8 discloses a "good conductive, high corrosion resistance and fingerprint resistant galvanized steel strip, surface treatment agent and treatment method". The surface of the galvanized steel strip is covered with a fingerprint resistant film. The film composition comprises: a) polyurethane and / or acrylic organic resin (A), accounting for 40-60% by weight; the glass transition temperature of the polyurethane and / or acrylic organic resin (A) is 30-80℃, and it has water solubility or water dispersibility; b) organosilane coupling agent (Ba) containing one or more amino functional groups, and organosilane coupling agent (Bb) containing at least one epoxy functional group, the weight ratio of (Ba) / (Bb) being 0.3-0.5; the weight ratio of the above organic resin (A) to organosilane coupling agent ((Ba)+(Bb)) being 1.0-2.0; the weight percentage of organosilane coupling agent being 38-53%; c) organic phosphorus compound (C), accounting for 0.01-0.1% by weight of phosphorus element; d) vanadium compound (D), accounting for 0.1-1.0% by weight of vanadium element; e) titanium compound or fluorine-containing titanium compound (E), accounting for 0.1-3.0% by weight of titanium element; f) polyethylene wax, accounting for 1-3% of the film content; wherein the profile arithmetic average roughness Ra value of the galvanized steel strip is 0.4-1.2μm, and the wave peak number RPc value is 50-150. A surface treatment agent with a solid content of 10-20% by weight is coated on both sides of the galvanized steel strip by using a two-roll or three-roll roll coater, the profile arithmetic average roughness Ra value of the galvanized steel strip is 0.4-1.2μm, and the wave peak number RPc value is 50-150; hot air or infrared induction heating is used for curing, and the plate temperature is controlled at 80-140℃; after cooling, a fingerprint resistant film with a dry film thickness of 0.5-1.5μm is formed on the surface of the galvanized steel strip. The main improvement is made to the composition of the fingerprint resistant passivation solution, and there is no involvement in how to control and optimize the equipment in the finishing section and the passivation section during the production process of the galvanizing unit. Only a wide range of parameters such as the surface roughness of the strip steel, the film weight, and the drying temperature are set, and the specific process control parameters are not specified. SUMMARY

[0006] The present application provides a high-conductive fingerprint-resistant galvanized plate and a production method thereof. The finishing rolling force, the surface roughness, and the fingerprint-resistant film weight of the strip steel with different thicknesses and different strength grades are accurately controlled. The plate temperature after drying, the plate temperature after cooling in the rising section, the plate temperature after cooling in the horizontal section, and the plate temperature after cooling in the descending section of the strip steel with different thicknesses are accurately controlled by using the air cooling mode. Finally, the surface conductivity of the fingerprint-resistant galvanized plate product is improved.

[0007] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0008] A high-conductivity fingerprint-resistant galvanized sheet, the chemical composition of the strip steel is as follows in terms of weight percentage: C: 0.001%-0.460%, Si: 0.01%-0.80%, Mn: 0.20%-2.60%, Cr: 0.01%-0.50%, Mo: 0.01%-0.25%, Ni≤0.10%, Cu≤0.10%, Nb≤0.500%, Ti≤0.300%, V≤0.008%, B≤0.005%, Al: 0.015%-0.045%, N≤0.004%, P≤0.080%, S≤0.012%, and the rest is Fe and inevitable impurities; and the surface of the strip steel is plated with a fingerprint-resistant film.

[0009] The fingerprint-resistant film is an organic resin-based passivation film.

[0010] The yield strength of the strip steel is ≥180 MPa, the thickness of the fingerprint-resistant film is 0.5-2.5 mm, the film weight is 0.60-0.9 g / m 2 , and the surface resistance value of the fingerprint-resistant galvanized sheet is ≤1 Ω.

[0011] A production method of a high-conductivity fingerprint-resistant galvanized sheet, in which the following processes are controlled during production:

[0012] 1) Finishing: according to the thickness b and the yield strength σ s of the strip steel, the finishing rolling force F and the control value of the surface roughness Ra are determined;

[0013] 2) Film plating: according to the thickness b and the yield strength σ s of the strip steel, the control value of the film weight a of the fingerprint-resistant film is determined;

[0014] 3) Cooling: an air cooling mode is adopted; roller one and roller two are arranged along the running direction of the strip steel for 90° angle change of the strip steel, forming a continuous ascending section, a horizontal section and a descending section; the strip steel running path upstream of roller one, i.e. the ascending section, is sequentially provided with a drying furnace, a first temperature measuring point, a cooling air box one and a second temperature measuring point; the strip steel running path between roller one and roller two, i.e. the horizontal section, is provided with a cooling air box two; the strip steel running path downstream of roller two, i.e. the descending section, is sequentially provided with a third temperature measuring point, a cooling air box three and a fourth temperature measuring point; according to the thickness b of the strip steel, the control values of the plate temperature T1 after drying, the plate temperature T2 after cooling in the ascending section, the plate temperature T3 after cooling in the horizontal section and the plate temperature T4 after cooling in the descending section are determined.

[0015] For strip steels with different thickness b and different yield strength σ s , the control values of the finishing rolling force F and the surface roughness Ra are as follows:

[0016] (a) for strip steels with 0.3 mm a b≤0.8 mm;

[0017] σ s ≤ 190 MPa, control 140 t < F < 180 t, 0.6 μm < Ra < 0.75 μm;

[0018] 190 MPa < σ s ≤ 260 MPa, control 180 t < F < 300 t, 0.75 μm < Ra < 0.90 μm;

[0019] 260 MPa < σ s ≤ 350 MPa, control 300 t < F < 400 t, 0.90 μm < Ra < 1.05 μm;

[0020] 350 MPa < σ s ≤ 450 MPa, control 400 t < F < 480 t, 1.05 μm < Ra < 1.20 μm;

[0021] σ S > 450 MPa, control 480 t < F < 600 t, 1.20 μm < Ra < 1.35 μm;

[0022] (b) for strip steel of 0.8 mm < b < 1.2 mm;

[0023] σ s ≤ 190 MPa, control 130 t < F < 170 t, 0.75 μm < Ra < 0.85 μm;

[0024] 190 MPa < σ s ≤ 260 MPa, control 170 t < F < 280 t, 0.85 μm < Ra < 0.95 μm;

[0025] 260 MPa < σ s ≤ 350 MPa, control 280 t < F < 360 t, 0.95 μm < Ra < 1.10 μm;

[0026] 350 MPa < σ s ≤ 450 MPa, control 360 t < F < 460 t, 1.10 μm < Ra < 1.25 μm;

[0027] σ s > 450 MPa, control 460 t < F < 580 t, 1.25 μm < Ra < 1.40 μm;

[0028] (c) for strip steel of 1.2 mm < b < 1.8 mm;

[0029] σ s ≤ 190 MPa, control 120 t < F < 160 t, 0.75 μm < Ra < 0.85 μm;

[0030] 190 MPa < σ s ≤ 260 MPa, control 160 t < F ≤ 260 t, 0.85 μm < Ra ≤ 1.00 μm;

[0031] 260 MPa < σ s ≤ 350 MPa, control 260 t < F ≤ 350 t, 1.00 μm < Ra ≤ 1.15 μm;

[0032] 350 MPa < σ s ≤ 450 MPa, control 350 t < F ≤ 430 t, 1.15 μm < Ra ≤ 1.25 μm;

[0033] σ s > 450 MPa, control 430 t < F ≤ 560 t, 1.25 μm < Ra ≤ 1.45 μm;

[0034] (d) for strip steel of 1.8 mm < b ≤ 2.5 mm;

[0035] σ s ≤ 190 MPa, control 110 t < F ≤ 150 t, 0.80 μm < Ra ≤ 0.95 μm;

[0036] 190 MPa < σ s ≤ 260 MPa, control 150 t < F ≤ 240 t, 0.95 μm < Ra ≤ 1.05 μm;

[0037] 260 MPa < σ s ≤ 350 MPa, control 240 t < F ≤ 330 t, 1.05 μm < Ra ≤ 1.20 μm;

[0038] 350 MPa < σ s ≤ 450 MPa, control 330 t < F ≤ 400 t, 1.20 μm < Ra ≤ 1.30 μm;

[0039] σ s > 450 MPa, control 400 t < F ≤ 520 t, 1.30 μm < Ra ≤ 1.50 μm.

[0040] For strip steel of 0.3 mm < thickness b ≤ 2.5 mm and having different yield strengths σ s , the control values of film weight a of the fingerprint-resistant film are as follows:

[0041] σ s ≤ 190 MPa, control 0.60 g / m 2 < a ≤ 0.65 g / m 2 ;

[0042] 190 MPa < σ s ≤ 260 MPa, control 0.65 g / m 2 < a ≤ 0.70 g / m 2 ;

[0043] 260 MPa < σ s ≤ 350 MPa, control 0.70 g / m 2 < a ≤ 0.75 g / m 2 ;

[0044] 350 MPa < σ s ≤ 450 MPa, control 0.75 g / m 2 < a ≤ 0.80 g / m 2 ;

[0045] σ s > 450 MPa, control 0.80 g / m 2 < a ≤ 0.85 g / m 2 .

[0046] For the strip steel with different thickness b, the control values of the plate temperature T1 after drying, the plate temperature T2 after cooling in the rising section, the plate temperature T3 after cooling in the horizontal section and the plate temperature T4 after cooling in the falling section are as follows:

[0047] 0.3 mm < b ≤ 0.8 mm, 360℃ < T1 ≤ 390℃, 180℃ < T2 ≤ 200℃, 90℃ < T3 ≤ 100℃, 55℃ < T4 ≤ 65℃;

[0048] 0.8 mm < b ≤ 1.2 mm, 350℃ < T1 ≤ 380℃, 170℃ < T2 ≤ 190℃, 85℃ < T3 ≤ 95℃, 50℃ < T4 ≤ 60℃;

[0049] 1.2 mm < b ≤ 1.8 mm, 340℃ < T1 ≤ 370℃, 160℃ < T2 ≤ 180℃, 75℃ < T3 ≤ 85℃, 45℃ < T4 ≤ 50℃;

[0050] 1.8 mm < b ≤ 2.5 mm, 320℃ < T1 ≤ 360℃, 150℃ < T2 ≤ 170℃, 70℃ < T3 ≤ 80℃, 40℃ < T4 ≤ 45℃.

[0051] Compared with the prior art, the present application has the following advantages:

[0052] For different thickness, different strength grade of strip steel, the finishing rolling force, the surface roughness and the film weight of the fingerprint-resistant film are precisely controlled; the air cooling film is adopted, and for different thickness of the strip steel, the plate temperature after drying, the plate temperature after cooling in the rising section, the plate temperature after cooling in the horizontal section and the plate temperature after cooling in the descending section are precisely controlled; finally the surface conductivity of the fingerprint-resistant galvanized plate product is improved. BRIEF DESCRIPTION OF DRAWINGS

[0053] Figure 1 is a structural schematic diagram of the air cooling device.

[0054] In the figure: 1. drying box; 2. cooling air box one; 3. cooling air box two; 4. cooling air box three; 5. roller one; 6. roller two; 7. strip steel; T1. first temperature measuring point; T2. second temperature measuring point; T3. third temperature measuring point; T4. fourth temperature measuring point. DETAILED DESCRIPTION

[0055] The strip steel chemical composition of the high-conductivity fingerprint-resistant galvanized plate according to the application is C: 0.001%~0.460%, Si: 0.01%~0.80%, Mn: 0.20%~2.60%, Cr: 0.01%~0.50%, Mo: 0.01%~0.25%, Ni≤0.10%, Cu≤0.10%, Nb≤0.500%, Ti≤0.300%, V≤0.008%, B≤0.005%, Al: 0.015%~0.045%, N≤0.004%, P≤0.080%, S≤0.012%, and the rest is Fe and inevitable impurities; the strip steel surface is plated with a fingerprint-resistant film.

[0056] The fingerprint-resistant film is an organic resin-based passivation film.

[0057] The strip steel yield strength is≥180MPa, the fingerprint-resistant film thickness is 0.5~2.5mm, the film weight is 0.60~0.9g / m 2 , and the fingerprint-resistant galvanized plate surface resistance value is≤1Ω.

[0058] The production method of the high-conductivity fingerprint-resistant galvanized plate according to the application controls the following processes in the production process:

[0059] 1) finishing: the finishing rolling force will affect the roughness (Ra) of the surface of the galvanized layer, and according to the research on the surface conductivity mechanism of the fingerprint-resistant galvanized plate, appropriately increasing the surface roughness of the galvanized layer of the fingerprint-resistant galvanized plate is beneficial to improving the conductivity. Therefore, the finishing parameters are reasonably controlled, and a reasonable surface roughness of the galvanized layer is obtained through the finishing process. The control values of the finishing rolling force F and the surface roughness R s of the strip steel with different thickness b and different yield strength σ a are different; as shown in Table 1:

[0060] Table 1

[0061]

[0062] 2) Coating: The fingerprint-resistant film of the present application is preferably an organic resin-based passivation film, which has poor conductivity and high resistivity, and under the premise of taking into account corrosion resistance, the weight of the fingerprint-resistant film is as low as possible, which is conducive to improving the conductivity. The present application controls the weight a of the fingerprint-resistant film to be different for the strip steel with thickness b of 0.3mm < b ≤ 2.5mm and different yield strength σ s ; as shown in Table 2:

[0063] Table 2

[0064]

[0065] 2) Cooling: Since the fingerprint-resistant passivation agent is in liquid state, the strip steel needs to be dried at high temperature after being coated with the fingerprint-resistant passivation agent by the roll coater, so that the water in it is volatilized to form a solidified organic film. During the cooling process after drying, the small polar molecules in the coating (such as wetting agents, etc.) will gradually precipitate from the inside of the coating to the surface, and a slower cooling speed is conducive to the aggregation of small polar molecules from the inside of the coating to the surface, increasing the surface polarity of the fingerprint-resistant coating, thereby improving the conductivity of the fingerprint-resistant galvanized steel sheet. Therefore, the cooling rate should be as low as possible during the cooling process after drying.

[0066] The present application does not use a water-cooled roller cooling mode, but an air cooling mode; as shown in Figure 1 , roller one 5 and roller two 6 are arranged along the running direction of the strip steel 7, which are used for 90° angle change of the strip steel to form a continuous rising section, a horizontal section and a descending section; the running path of the strip steel 7 upstream of the roller one 5, i.e. the rising section, is provided with a drying furnace 1, a first temperature measuring point T1, a cooling air box one 2 and a second temperature measuring point T2 in sequence; the running path of the strip steel 7 between the roller one 5 and the roller two 6, i.e. the horizontal section, is provided with a cooling air box two 3; the running path of the strip steel 7 downstream of the roller two 6, i.e. the descending section, is provided with a third temperature measuring point T3, a cooling air box three 4 and a fourth temperature measuring point T4 in sequence.

[0067] For strip steels with different thickness b, the plate temperature T1 after drying, the plate temperature T2 after cooling in the rising section, the plate temperature T3 after cooling in the horizontal section and the plate temperature T4 after cooling in the descending section are controlled respectively; as shown in Table 3:

[0068] Table 3

[0069]

[0070] In order to more directly reflect the present application, the embodiments of the present application are further described in combination with examples. The following examples are only the preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can obtain the technical solutions which are obvious within the technical range disclosed by the present application, including simple changes or equivalent replacements, all of which are within the protection scope of the present application.

[0071]

EXAMPLE

[0072] The chemical composition of the strip steel in each example is shown in Table 4, and the main production process parameters for producing the high-conductivity strip steel are shown in Table 5.

[0073] Table 4 Chemical composition of strip steel (wt%)

[0074]

[0075] Table 5 Main production process parameters for producing high-conductivity strip steel

[0076]

[0077] As can be seen from the above examples, the production method of the high-conductivity fingerprint-resistant galvanized sheet described in the present application can realize stable improvement of the surface conductivity of the fingerprint-resistant galvanized sheet.

[0078] The above description is only the preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can obtain the technical solutions which are obvious within the technical range disclosed by the present application, including simple changes or equivalent replacements, all of which are within the protection scope of the present application.

Claims

1. A method for producing a high-conductivity fingerprint-resistant galvanized steel sheet, characterized by, The chemical composition of the strip steel is C: 0.001%-0.460%, Si: 0.01%-0.80%, Mn: 0.20%-2.60%, Cr: 0.01%-0.50%, Mo: 0.01%-0.25%, Ni≤0.10%, Cu≤0.10%, Nb≤0.500%, Ti≤0.300%, V≤0.008%, B≤0.005%, Al: 0.015%-0.045%, N≤0.004%, P≤0.080%, S≤0.012%, and the rest is Fe and inevitable impurities; the surface of the strip steel is plated with a fingerprint-resistant film; the yield strength of the strip steel is ≥180MPa, the thickness of the fingerprint-resistant film is 0.5-2.5mm, the film weight is 0.60-0.9g / m 2 , and the surface resistance of the fingerprint-resistant galvanized sheet is ≤1Ω. The production process controls the following processes: 1) finishing: based on the thickness b and the yield strength σ of the strip steel, the finishing rolling force F and the control value of the surface roughness Ra are determined; s , the finishing rolling force F and the control value of the surface roughness Ra are determined; 2) Coating: according to the thickness b and yield strength σ of the strip steel, the control value of the film weight a of the fingerprint-resistant film is determined; s , the control value of the film weight a of the fingerprint-resistant film is determined; 3) Cooling: air cooling mode is adopted; roller one and roller two are arranged along the running direction of the strip steel, for changing the direction of the strip steel by 90 degrees, forming a continuous ascending section, a horizontal section and a descending section; the strip steel running path upstream of the roller one, i.e. the ascending section, is sequentially provided with a drying furnace, a first temperature measuring point, a cooling air box one and a second temperature measuring point; the strip steel running path between the roller one and the roller two, i.e. the horizontal section, is provided with a cooling air box two; the strip steel running path downstream of the roller two, i.e. the descending section, is sequentially provided with a third temperature measuring point, a cooling air box three and a fourth temperature measuring point; according to the thickness b of the strip steel, the control values of the plate temperature T1 after drying, the plate temperature T2 after cooling in the ascending section, the plate temperature T3 after cooling in the horizontal section and the plate temperature T4 after cooling in the descending section are determined respectively.

2. The method of producing a high-conductivity fingerprint-resistant galvanized steel sheet according to claim 1, characterized by, The fingerprint-resistant film is an organic resin-based passivation film.

3. The method of producing a high-conductivity fingerprint-resistant galvanized steel sheet according to claim 1, characterized by, For the strip steel of different thickness b, different yield strength σ s The control values of finishing rolling force F and surface roughness R a are as follows: (a) for the strip steel with 0.3mm σ s when 190 MPa < σ < 220 MPa, control 140 t < F ≤ 180 t, 0.6 μm < Ra ≤ 0.75 μm; 190 MPa < σ s when 260 MPa < σ ≤ 300 MPa, control 180 t < F ≤ 300 t, 0.75 μm < Ra ≤ 0.90 μm; 260 MPa < σ s when σ > 350 MPa, control 300 t < F ≤ 400 t, 0.90 μm < Ra≤ 1.05 μm; 350 MPa < σ s when σ > 450 MPa, control 400 t < F ≤ 480 t, 1.05 μm < Ra≤ 1.20 μm; σ S > 450 MPa, control 480 t < F ≤ 600 t, 1.20 μm < Ra ≤ 1.35 μm; (b) for the strip steel with 0.8mm σ s when 190 MPa < σ < 210 MPa, control 130 t < F < 170 t, 0.75 μm < Ra < 0.85 μm; 190 MPa < σ s when 260 MPa < σ < 300 MPa, control 170 t < F < 280 t, 0.85 μm < Ra < 0.95 μm; 260 MPa < σ s when 350 MPa < σ ≤ 450 MPa, control 280 t < F ≤ 360 t, 0.95 μm < Ra≤ 1.10 μm; 350 MPa < σ s when σ > 450 MPa, control 360 t < F ≤ 460 t, 1.10 μm < Ra≤ 1.25 μm; σ s > 450 MPa, control 460 t < F ≤ 580 t, 1.25 μm < Ra≤ 1.40 μm; (c) for the strip steel with 1.2mm σ s when 190 MPa < σ < 220 MPa, control 120 t < F < 160 t, 0.75 μm < Ra < 0.85 μm; 190 MPa < σ s when 260 MPa < σ ≤ 300 MPa, control 160 t < F ≤ 260 t, 0.85 μm < Ra≤ 1.00 μm; 260 MPa < σ s when 350 MPa < σ ≤ 450 MPa, control 260 t < F ≤ 350 t, 1.00 μm < Ra≤ 1.15 μm; 350 MPa < σ s when σ > 450 MPa, control 350 t < F ≤ 430 t, 1.15 μm < Ra≤ 1.25 μm; σ s > 450 MPa, control 430 t < F ≤ 560 t, 1.25 μm < Ra ≤ 1.45 μm; (d) for the strip steel with 1.8mm σ s when 190 MPa < σ < 220 MPa, control 110 t < F ≤ 150 t, 0.80 μm < Ra≤ 0.95 μm; 190 MPa < σ s when σ > 260 MPa, control 150 t < F ≤ 240 t, 0.95 μm < Ra≤ 1.05 μm; 260 MPa < σ s when σ > 350 MPa, control 240 t < F ≤ 330 t, 1.05 μm < Ra≤ 1.20 μm; 350 MPa < σ s when σ > 450 MPa, control 330 t < F ≤ 400 t, 1.20 μm < Ra≤ 1.30 μm; σ s When the tensile strength is 450 MPa or more, the control is 400 t < F ≤ 520 t, and 1.30 μm ≤ Ra ≤ 1.50 μm.

4. The method of producing a high-conductivity fingerprint-resistant galvanized steel sheet according to claim 1, characterized by, For strip steel with thickness b of 0.3 mm < thickness b < 2.5 mm and with different yield strengths σ s The control value of the film weight a of the fingerprint-resistant film is as follows: σ s ≤ 190 MPa, control 0.60 g / m 2 ≤ 0.65 g / m 2 ; 190 MPa < σ s ≤ 260 MPa, control 0.65 g / m 2 < a ≤ 0.70 g / m 2 ; 260 MPa < σ s ≤ 350 MPa, control 0.70 g / m 2 < a ≤ 0.75 g / m 2 ; 350 MPa < σ s ≤ 450 MPa, control 0.75 g / m 2 ≤ 0.80 g / m 2 ; σ s > 450 MPa, control 0.80 g / m 2 < a < 0.85 g / m 2 .

5. The method of producing a high-conductivity, fingerprint-resistant galvanized steel sheet according to claim 1, characterized in that, For the strip steel with different thickness b, the control values of the plate temperature T1 after drying, the plate temperature T2 after cooling in the ascending section, the plate temperature T3 after cooling in the horizontal section and the plate temperature T4 after cooling in the descending section are as follows: 0.3mm 0.8mm 1.2mm 1.8mm 2.5mm.

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