Cold-rolled riffled steel plate and manufacturing method thereof
By controlling the average surface roughness difference of the cold-rolled steel plate surface and directly forming patterns with pattern rolls, the problem of additional processing steps and chemical reagents required for the printing of steel plate surface patterns in the prior art is solved, and the effect of low cost, environmental protection and mechanical properties is achieved.
Patent Information
- Application Number
- CN202311538682.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-17
- Publication Date
- 2025-05-20
AI Technical Summary
When printing patterns or patterns on the surface of steel plates, the prior art requires additional processing steps and chemical reagents, resulting in high costs, high environmental risks and reduced mechanical properties.
By controlling the average surface roughness difference of the cold-rolled steel plate surface, the pattern roll is used to directly form patterns on the steel plate surface, avoiding the use of additional processing steps and chemical reagents.
The formation of the surface pattern of the steel plate is achieved, while retaining the metallic gloss effect and the mechanical properties of the steel plate are retained, reducing production costs and reducing environmental risks.
Smart Images
Figure CN120019895A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a cold-rolled steel sheet and a manufacturing method thereof, and particularly to a cold-rolled steel sheet with a pattern on the surface and a manufacturing method thereof. Background Art
[0002] With the improvement of users' requirements for the surface appearance of products and the continuous emergence of personalized needs, there is a need to print patterns or designs on the surface of steel sheets.
[0003] To meet the requirement of patterns or designs on the surface of steel sheets, the prior art such as chemical etching, electroplating, spraying, laser marking, and mechanical embossing can all achieve the pattern or design effect on the surface of steel sheets. However, since additional processing steps are required to prepare the patterns or designs, and some of these technologies also require the use of additional consumables, the processing cost is relatively high.
[0004] In addition, methods such as etching and electroplating often require the use of chemical reagents, posing certain environmental protection risks; spraying on the surface of steel sheets usually destroys the original metallic luster on the surface of steel sheets due to the presence of non-metallic inks or coatings; the processing efficiency of the laser marking method is relatively low; although the mechanical embossing method has a relatively low cost, during the mechanical embossing process, plastic deformation of the material occurs, the yield strength of the material increases, and the yield ratio increases, resulting in a significant decrease in the stamping formability of the material. Summary of the Invention
[0005] One of the purposes of the present invention is to provide a cold-rolled patterned steel sheet. During the processing of this steel sheet, no additional chemical reagents are used. Therefore, after processing the surface pattern, the metal luster of the steel sheet itself is still retained on the surface, and the mechanical properties of the steel sheet will not be reduced during the process of processing the pattern.
[0006] To achieve the above purpose, the present invention provides a cold-rolled patterned steel sheet. A plurality of regions are provided on the same surface of the steel sheet, and the adjacent regions have different average surface roughnesses. The pattern on the surface of the cold-rolled patterned steel sheet is formed by the visual color difference generated by the difference in the average surface roughnesses of different regions.
[0007] Further, in the cold-rolled patterned steel sheet of the present invention, the difference in the average surface roughness ΔSa between adjacent regions on the same surface of the steel sheet is ≥ 0.4 μm.
[0008] Further, in the cold-rolled patterned steel sheet of the present invention, the difference in the average surface roughness ΔSa between adjacent regions on the same surface of the steel sheet is ≥ 0.8 μm.
[0009] Furthermore, in the cold-rolled patterned steel sheet of the present invention, a transition zone with a width ≤ 0.1 mm exists between adjacent regions on the same surface, and the difference ΔSaˊ between the average surface roughness of the transition zone and the average surface roughness of any one of the adjacent regions is less than ΔSa of the plate.
[0010] Furthermore, in the cold-rolled patterned steel sheet of the present invention, it contains Fe and the following chemical elements with the mass percentages as follows:
[0011] 0 < C ≤ 0.1%, 0 < Si ≤ 0.02%, 0 < Mn ≤ 0.5%, P ≤ 0.035%, S ≤ 0.035%, N ≤ 0.01%.
[0012] Furthermore, in the cold-rolled patterned steel sheet of the present invention, the mass percentages of its chemical elements are:
[0013] 0 < C ≤ 0.1%, 0 < Si ≤ 0.02%, 0 < Mn ≤ 0.5%, P ≤ 0.035%, S ≤ 0.035%, N ≤ 0.01%; the balance is Fe and inevitable impurity elements.
[0014] Furthermore, in the cold-rolled patterned steel sheet of the present invention, its yield strength ≤ 240 MPa, tensile strength ≥ 270 MPa, yield ratio ≤ 0.7, and elongation after fracture A80 ≥ 30%.
[0015] Furthermore, the thickness of the cold-rolled patterned steel sheet of the present invention is 0.4 - 2.0 mm.
[0016] Correspondingly, another object of the present invention is to provide a manufacturing method of a cold-rolled patterned steel sheet. This method does not require additional processing steps and additional chemical reagents, and directly processes patterns on the steel sheet surface through the skin pass rolling process in the conventional steel sheet production process. Therefore, it can enable the steel sheet to maintain mechanical properties substantially consistent with those of conventional steel sheets.
[0017] To achieve the above object, the present invention provides a manufacturing method of a cold-rolled patterned steel sheet, which includes the steps of:
[0018] Cold-roll the hot-rolled steel sheet and control the surface roughness of the steel sheet after cold rolling so that its average surface roughness Sa ≤ 1.2 μm;
[0019] Anneal the cold-rolled steel sheet;
[0020] Skin pass roll the steel sheet using a patterned roll, and different regions of the patterned roll have different average surface roughnesses.
[0021] In the present invention, the surface roughness of the cold-rolled steel sheet can be controlled by controlling the roughness of the rolling rolls used in the cold rolling process. In some embodiments, when the surface roughness of the cold-rolled steel sheet is too high, the pattern effect on the steel sheet surface will be weakened. Therefore, the surface roughness Sa of the cold-rolled steel sheet can be controlled to be ≤ 1.2 μm. In some more preferred embodiments, the surface roughness Sa of the cold-rolled steel sheet can be controlled to be ≤ 1.0 μm.
[0022] Furthermore, in the manufacturing method of the cold-rolled patterned steel sheet of the present invention, the difference ΔSa roll in the average surface roughness between two adjacent regions of the patterned roll is ≥ 1.5 μm.
[0023] Furthermore, in the manufacturing method of the cold-rolled patterned steel sheet of the present invention, the leveler rate of the leveling is 1 - 3%.
[0024] In the present invention, when the leveler rate is lower than 1%, due to the small reduction of the leveling, the contact pressure between the rolling roll and the strip surface is insufficient, and the pattern on the roll surface is difficult to be effectively transferred to the strip surface; when the leveler rate is higher than 3%, due to the excessive reduction of the leveling, the yield strength of the steel sheet increases significantly, and the yield ratio of the material is too high, which affects the stamping formability of the material.
[0025] Furthermore, in the manufacturing method of the cold-rolled patterned steel sheet of the present invention, the pattern on the surface of the patterned roll is obtained by laser texturing process.
[0026] In the present invention, according to the shape of the target pattern, the power of the laser can be dynamically adjusted to process different roughness regions on the roll surface.
[0027] Furthermore, in the manufacturing method of the cold-rolled patterned steel sheet of the present invention, when laser texturing the patterned roll, it satisfies the following relationship:
[0028]
[0029] Among them, Ф represents the diameter of the patterned roll, and its unit parameter is mm; v represents the rotational speed of the patterned roll, and its unit parameter is r / min; f represents the laser switching frequency, and its unit parameter is Hz.
[0030] Compared with the prior art, the cold-rolled patterned steel sheet of the present invention has the following advantages and beneficial effects:
[0031] The surface pattern effect of the cold-rolled patterned steel sheet described in the present invention is achieved based on the visual color difference effect of surface roughness, retaining the good metallic luster effect of the metal surface itself. The production process of the finished product is the same as that of conventional cold-rolled steel sheets, without additional processing steps and additional chemical reagents, so it has the advantages of low cost and environmental protection. At the same time, the pattern is directly imparted during the leveling process in the conventional production process of the steel sheet, enabling the steel sheet to maintain mechanical properties substantially consistent with those of conventional steel sheets.
[0032] In some preferred embodiments of the present invention, the yield strength of the cold-rolled patterned steel sheet is ≤240 MPa, the tensile strength is ≥270 MPa, the yield ratio is ≤0.7, and the elongation after fracture A80 ≥ 30%. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Figure 1 Schematically shows a cross-sectional profile schematic diagram of the surface topography of the cold-rolled patterned steel sheet described in the present invention.
[0034] Figure 2 Exemplarily shows the surface pattern effect of the cold-rolled patterned steel sheet described in the present invention.
[0035] Figure 3 Shows the surface microtopography of the cold-rolled patterned steel sheet of Example 1 described in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0036] The following will further explain and illustrate the cold-rolled patterned steel sheet and its manufacturing method described in the present invention with specific embodiments. However, this explanation and illustration do not unduly limit the technical solution of the present invention.
[0037] Figure 1 Schematically shows a cross-sectional profile schematic diagram of the surface topography of the cold-rolled patterned steel sheet described in the present invention.
[0038] As Figure 1 shown, the surface pattern of the cold-rolled patterned steel sheet described in the present invention is formed by at least two regions with different roughness levels. For example, there is a high-roughness region 2 with a large micro-profile undulation and a low-roughness region 1 with a small micro-profile undulation.
[0039] By controlling different regions to have different roughnesses, a pattern can be formed on the steel sheet surface based on the visual color difference effect of surface roughness. For example Figure 2 exemplarily shows a surface pattern effect of the cold-rolled patterned steel sheet described in the present invention.
[0040] As Figure 2 shown, by controlling the first region A and the second region B to have different roughnesses, a cross-grid pattern can be formed on the steel sheet surface.
[0041] The following uses Examples 1-4 to further illustrate the present invention and further verify the implementation effect of this case.
[0042] Examples 1-4
[0043] The cold-rolled patterned steel plates of Examples 1-4 described in the present invention are all prepared by the following steps:
[0044] (1) After pickling to remove the scale, the hot-rolled steel plate is cold-rolled. The cold rolling can adopt the 5-stand continuous rolling method to control the surface roughness of the cold-rolled steel plate so that its average surface roughness Sa≤1.2μm. The mass percentage of each chemical element of the steel plate is as shown in Table 1, and the thickness of the steel plate can be controlled between 0.4-2.0mm.
[0045] (2) Anneal the cold-rolled steel plate.
[0046] (3) Level the steel plate with a patterned roll. The leveling rate can be controlled between 1-3%, and different regions of the patterned roll have different average surface roughnesses. Specifically, the process parameters are shown in Table 2.
[0047] In the above-mentioned examples, the roll with a pattern on the surface is obtained by roll laser texturing. According to the target pattern shape, the opening and closing of the laser pulse are controlled to achieve selective texturing processing of the roll surface, so that there are textured areas and untextured areas on the roll surface. Among them, the surface roughness of the textured area and the untextured area is measured with reference to the ISO25178-1:2016 standard.
[0048] In some more specific embodiments, when the roll texturing process is carried out, the roll diameter Ф, the pulse switching frequency f of the laser, and the roll speed v can be controlled to satisfy the following relationship:
[0049]
[0050] Among them, Ф represents the diameter of the patterned roll, and its unit parameter is mm; v represents the rotational speed of the patterned roll, and its unit parameter is r / min; f represents the laser switching frequency, and its unit parameter is Hz.
[0051] Satisfying the above relationship can make the width of the transition zone ≤0.1mm, where the transition zone is defined as the difference ΔSa′ between its average surface roughness and the average surface roughness of any one of the adjacent regions is less than ΔSa 板 .
[0052] Table 1 lists the mass percentage of each chemical element of the cold-rolled patterned steel plates of Examples 1-4.
[0053] Table 1. (wt%, the balance is Fe and other inevitable impurities except P, S, N)
[0054]
[0055] Table 2 lists the specific process parameters of the cold-rolled patterned steel plate of Example 1-4.1.
[0056] Table 2.
[0057]
[0058] The surface morphology of the cold-rolled patterned steel plate of Example 1 obtained was observed. Figure 3 The observation results are shown.
[0059] From Figure 3 it can be seen that the average surface roughness Sa of the low roughness region B l = 0.64 μm, and the average surface roughness Sa of the high roughness region A h = 1.45 μm, the difference ΔSa = 0.81 μm, and the transition zone width d = 0.05 mm. Thus, it can be known that the adjacent regions A and B obviously have different roughnesses, thereby forming a pattern on the steel plate surface.
[0060] The cold-rolled patterned steel plates of Example 1-4 obtained were sampled respectively. Referring to the GB / T228.1-2021 standard, the mechanical properties of each example were tested, and the test results were listed in Table 3. At the same time, the pattern effect on the steel plate surface was evaluated visually, and the evaluation results were listed in Table 3.
[0061] Table 3.
[0062]
[0063] Note: In Table 3, "+" indicates that the surface pattern is visible by visual inspection, and the more the number, the higher the clarity or recognition.
[0064] Combining Table 1, Table 2 and Table 3, it can be seen that the cold-rolled patterned steel plates of Example 1-4 of the present invention also have excellent mechanical properties. Their yield strengths are all less than 240 MPa, the tensile strengths are all greater than 270 MPa, the yield ratio is all less than or equal to 0.7, and the elongation after fracture A 80 is all greater than 30%. At the same time, from the actual pattern effect, increasing the temper rolling reduction rate and the roughness difference of the roll surface can effectively enhance the clarity of the pattern.
[0065] It should be noted that the combination method of each technical feature in this case is not limited to the combination method recorded in the claims of this case or the combination method recorded in the specific embodiments. All the technical features recorded in this case can be freely combined or combined in any way, unless contradictions occur between them.
[0066] It should also be noted that the above-listed embodiments are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and similar changes or modifications made therewith can be directly derived or easily associated with the contents disclosed by those skilled in the art from the present invention, and all should belong to the protection scope of the present invention.
Claims
1. A cold-rolled patterned steel plate, characterized in that: The same surface thereof has several regions, wherein adjacent regions have different average surface roughnesses, and the surface of the cold-rolled patterned steel plate has a pattern formed by visual color difference caused by the difference in different average surface roughnesses.
2. The cold-rolled patterned steel plate according to claim 1, characterized in that: The average surface roughness difference ΔSa of adjacent areas on the same surface 板 ≥0.4μm.
3. The cold-rolled patterned steel plate according to claim 1, characterized in that: The average surface roughness difference ΔSa of adjacent areas on the same surface 板 ≥0.8μm.
4. The cold-rolled patterned steel plate according to claim 1, characterized in that: There is a transition zone with a width of ≤0.1 mm between adjacent areas of the same surface, and the difference ΔSa′ between the average surface roughness of the transition zone and the average surface roughness of any of the adjacent areas is less than ΔSa 板 .
5. The cold-rolled patterned steel plate according to claim 1, characterized in that: It contains Fe and the following chemical elements in the following mass percentages: 0<C≤0.1%, 0<Si≤0.02%, 0<Mn≤0.5%, P≤0.035%, S≤0.035%, N≤0.01%.
6. The cold-rolled patterned steel plate according to claim 5, characterized in that: The mass percentage of each chemical element is: 0<C≤0.1%, 0<Si≤0.02%, 0<Mn≤0.5%, P≤0.035%, S≤0.035%, N≤0.01%; the balance is Fe and unavoidable impurity elements.
7. The cold-rolled patterned steel sheet according to claim 5 or 6, characterized in that: Its yield strength is ≤240MPa, tensile strength is ≥270MPa, yield strength ratio is ≤0.7, elongation after fracture is A 80 ≥30%.
8. The cold-rolled patterned steel plate according to claim 1, characterized in that: Its thickness is 0.4~2.0mm.
9. The method for manufacturing a cold-rolled patterned steel plate according to any one of claims 1 to 8, characterized in that: Includes steps: Cold rolling the hot-rolled steel sheet, and controlling the surface roughness of the cold-rolled steel sheet so that its average surface roughness Sa is ≤ 1.2 μm; Annealing the cold rolled steel sheet; The steel plate is flattened by a patterned roller, and different areas of the patterned roller have different average surface roughnesses.
10. The manufacturing method according to claim 9, characterized in that: The average surface roughness difference ΔSa between two adjacent areas of the pattern roller 辊 ≥1.5μm.
11. The manufacturing method according to claim 9, characterized in that: The flattening rate of the flattening is 1-3%.
12. The manufacturing method according to claim 9, characterized in that: The pattern on the surface of the patterned roller is made by laser texturing process.
13. The manufacturing method according to claim 12, characterized in that: When laser texturing is performed on the pattern roller, the following relationship is satisfied: Among them, Ф represents the diameter of the pattern roller, and its unit parameter is mm; v represents the rotation speed of the pattern roller, and its unit parameter is r / min; f represents the laser switching frequency, and its unit parameter is Hz.