CN101905240B - Method for finishing hot-dip coated steel sheet - Google Patents
Method for finishing hot-dip coated steel sheet Download PDFInfo
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Abstract
The invention relates to a method for finishing a hot-dip coated steel sheet, comprising the step of rolling a hot-dip coated steel sheet by using a finishing roller, wherein the surface roughness of the finishing roller Ra is less than or equal to 1 Mum. The method is especially suitable for hot galvanized steel sheets and hot galvanized and aluminized steel sheets with zinc spangles on the coated surface. The method can ensure good shape, surface quality and coating performance of the hot-dip coated steel sheet and can ensure that zinc spangle profiles on the coating surface are clear and maintain good appearance decoration performance. In addition, the method is also suitable for finishing hot galvanized and aluminized steel sheets and facilitates the application of the hot galvanized and aluminized steel sheets to the electric appliance manufacturing industry and other industries having higher requirements for shape, surface quality and coating performance of the hot galvanized and aluminized steel sheets.
Description
Technical field
The present invention relates to a kind of method of finishing hot-dip coated steel sheet.
Background technology
Hot-dip galvanizing sheet steel and hot-dip aluminizing zincium steel plate are the most widely hot-dip coated steel sheets of present domestic and international application.Its technological process of production is: cooling after cold rolling coil → uncoiling → cleaning by degreasing → continuous annealing → hot-dip → plating.As shown in Figure 1, after hot-dip galvanizing sheet steel and hot-dip aluminizing zincium steel plate pass through hot-dip, be formed with certain thickness coating and form the zinc with exterior decorative effect at coating surface colored at surface of steel plate.
Hot-dip galvanizing sheet steel of many uses both can be used for household electrical appliances, auto manufacturing that stamping performance, surface quality, plate shape and coating performance to material are had relatively high expectations, also can be used for the fields such as building industry that decorative appearance is had relatively high expectations.For coating performance, plate shape and the surface quality of improving hot-dip galvanizing sheet steel, can carry out polishing to hot-dip galvanizing sheet steel.In the prior art, polishing is to use the texturing polishing roll of roughness Ra 〉=2 μ m that hot-dip galvanizing sheet steel is carried out little depress rolling, thereby for hot-dip galvanizing sheet steel provides certain roughness, improving the forming property of steel plate, and the adhesive force of paint film and the presentation quality after the application when having improved application.Polishing can also improve the flatness of steel plate, and has improved plate shape and surface quality.
Have orientation characteristics preferentially because the zinc on hot-dip galvanizing sheet steel and hot-dip aluminizing zincium steel plate surface flower forms, by the different orientation contrasts that form of orientation of zinc flower cause that coating surface presents that zinc spends than light with than dark-part.The texturing polishing roll of available technology adopting roughness Ra 〉=2 μ m carries out the rolling of little depressing (percentage elongation about 0.3～1.5%) to hot-dip galvanizing sheet steel.Behind texturing polishing roll polishing, although the adhesive force of paint film when having improved application, as shown in Figure 2, the contour shape of zinc flower is fuzzy, has had a strong impact on the exterior decorative effect of steel plate.Therefore, present hot-dip galvanizing sheet steel selects whether to carry out polishing according to purposes.For example, when hot-dip galvanizing sheet steel is used for household electrical appliances, auto manufacturing that stamping performance, surface quality, plate shape and the coating performance of material are had relatively high expectations, must carry out polishing.And when hot-dip galvanizing sheet steel is used for building industry that appearance effect has relatively high expectations, usually do not carry out polishing.But along with the fierceness of industry competition, the fields such as building industry also not only require the exterior decorative effect of hot-dip galvanizing sheet steel, need to guarantee equally forming property, plate shape and the surface quality of sheet material.
Though hot-dip aluminizing zincium steel plate has excellent corrosion resistance, good heat reflectivity and decorative appearance etc., its coating forming property is relatively poor for heat zinc coating plate, and coating is easy to crack in the part punching forming process.This mainly is because there is in the middle of the Fe-Al-Si-Zn fragility mutually layer in coating, and causing easily in the middle of this fragility mutually in punching course, layer cracks; In addition, the rich Zn phase in the coating and rich Al mutually physical property there are differences, and can not coordinate during Pressing Deformation, thereby crack easily on the interface of two-phase; In addition, the Si precipitated phase appears in hot-dip aluminizing zinc layer easily, causes the inhomogeneous of coating.Therefore, hot-dip aluminizing zincium steel plate main application fields at home and abroad is less demanding and decorative appearance is had the building industry of requirement to forming property, surface quality and plate shape always, during actual production, does not generally all adopt polishing.
In recent years, household appliances manufacturing has excellent corrosion resistance and the good characteristics such as decorative appearance based on hot-dip aluminizing zincium steel plate, for being conducive to environmental protection, reduces the household electrical appliances manufacturing cost simultaneously, has proposed to substitute with hot-dip aluminizing zincium steel plate the requirement of galvanizing spray coating plate.In addition, along with being growing more intense of market competition, building trade is more and more higher to the requirement of the surface quality of material, plate shape, formability.Therefore, need to carry out polishing to hot-dip aluminizing zincium steel plate.
Therefore, need research how to improve existing finishing process, with the contradictory problems between the decorative appearance of coordinating to solve heat zinc coating plate, hot dip aluminum zinc plate and surface quality, formability, plate shape.
Summary of the invention
The present inventor finds that through research the reason that Deposit appearance presents the zinc flower is to show on the coating than light with than dark-part, and adjacent has formed the profile that zinc is spent than light with than dark-part.Roughness (Ra than light
B) and than the roughness (Ra of dark-part
D) have a small difference (Δ Ra=|Ra
B-Ra
D|), namely than light with than the roughness difference between the dark-part.Described roughness difference is the result of coating preferable grain orientation growth, and the orientation contrast that described roughness difference produces has kept the clear profile of zinc flower, and described roughness difference is about 0.05-0.10 μ m.Soak on the steel plate in the hot dip that is formed with the zinc flower, the inhomogeneous roughness that consists of surface of steel plate (being macro-asperity) of thickness of coating, and the described ruggedness that refers to the surface of steel plate microcosmic that consists of than light with than dark-part than light with than the roughness discrepancy delta Ra between the dark-part.Described roughness difference belongs to asperity with respect to the roughness of surface of steel plate.Steel surface roughness behind the polishing depends on surface roughness and the transmission efficiency of polishing roll.Depend primarily on the surface roughness of polishing roll by the polishing roll to the surface roughness transmission efficiency of steel plate, polishing roll-force and tension force also are the key factors of the described surface roughness transmission efficiency of impact.When the roughness of polishing roll is larger (such as Ra＞2.0 μ m), its roughness that passes to surface of steel plate is larger, simultaneously zinc flower (surface of steel plate microcosmic uneven) is driven plain, thereby it is larger that surface of steel plate is had, uniform roughness (having substantially exceeded rolling hot-dip galvanizing sheet steel surface roughness before), destroyed the roughness difference that makes the zinc flower be clear profile, even on the hot-dip surface of steel plate, can't differentiate than light with than dark-part, be original roughness than light and no longer include difference than the roughness of dark-part, thereby the soft edge of zinc flower, the steel plate appearance effect is not good.The inventor also finds, in order to make the clear-cut of zinc flower, should remain on 0.05-0.15 μ m than light with than the roughness difference of dark-part.
Therefore, for the contradiction between the exterior decorative effect that solves hot-dip galvanizing sheet steel and hot-dip aluminizing zincium steel plate and surface quality, formability, the plate shape, the invention provides a kind of method of finishing hot-dip coated steel sheet.
In the method for finishing hot-dip coated steel sheet of the present invention, the method comprises uses the polishing roll that hot-dip coated steel sheet is rolled, wherein, and the surface roughness Ra of described polishing roller≤1 μ m.
Use the method for finishing hot-dip coated steel sheet of the present invention, can make steel plate obtain good surface quality.Especially hot-dip galvanizing sheet steel and hot-dip aluminizing zincium steel plate, the surface roughness of polishing roll is less, during polishing the transmission efficiency of the surface roughness of described polishing roll a little less than, thereby make zinc flower than light with than the roughness difference that still keeps making zinc flower clear-cut between the roughness of dark-part, can not make steel plate have uniform roughness and the roughness than light of eliminating the zinc flower is divided and than the difference between the roughness of dark-part.Therefore, use described polishing method when obtaining preferably plate shape, surface quality and coating performance, to guarantee that the zinc flower clear-cut of coating surface is to keep good decorative appearance.In addition, because method of the present invention also is applicable to the polishing hot-dip aluminizing zincium steel plate, thereby be conducive to hot-dip aluminizing zincium steel plate in the use to the higher industry of plate shape, surface quality and coating performance such as household appliances manufacturing.
Description of drawings
Fig. 1 is the outward appearance of the carbon aluminium-killed steel hot dip aluminum zinc plate before the polishing;
Fig. 2 is the appearance effect of carrying out carbon aluminium-killed steel hot dip aluminum zinc plate behind the polishing with surface roughness greater than the polishing roll of 2 μ m;
Fig. 3 uses polishing method of the present invention to carry out the appearance effect of carbon aluminium-killed steel hot dip aluminum zinc plate behind the polishing;
Fig. 4 uses polishing method of the present invention to carry out the stress-strain diagram of carbon aluminium-killed steel heat zinc coating plate behind the polishing.
The specific embodiment
In the method for finishing hot-dip coated steel sheet of the present invention, when using the polishing roll that hot-dip coated steel sheet is carried out little depress rolling, the surface roughness Ra of polishing roll≤1 μ m is preferably 0.1-0.9 μ m, further preferred Ra is 0.1-0.5 μ m, further is preferably 0.1-0.3 μ m.The method of finishing hot-dip coated steel sheet of the present invention is particularly useful for hot-dip galvanizing sheet steel and hot-dip aluminizing zincium steel plate, and the method for finishing hot-dip coated steel sheet of the present invention hereinafter is described as example take hot-dip galvanizing sheet steel and hot-dip aluminizing zincium steel plate.
In the polishing method of the present invention, use the polishing roll of roughness Ra≤1 μ m that hot-dip galvanizing sheet steel and hot-dip aluminizing zincium steel plate are carried out polishing.Preferably, use the alap smooth roll of surface roughness to carry out polishing.The zinc flower that the surface of hot-dip galvanizing sheet steel and hot-dip aluminizing zincium steel plate forms because of orientation contrast and roughness difference than light with than dark-part.By keeping clearly profile of zinc flower than light with than the roughness difference of dark-part.Because the surface roughness of polishing roll is lower, therefore the transmission effect of the surface roughness of roll can be too not strong, what that is to say zinc flower behind the polishing still has roughness difference than light with than dark-part, this can from steel surface roughness before and after the polishing change little and indirect reaction out.Although can change to some extent than light with than the roughness difference of dark-part behind the polishing, described roughness the change of divergence is little, thereby kept clearly profile and guarantee the decorative appearance of steel plate of zinc flower.
In addition, by control polishing percentage elongation can make the hot-dip steel plate carry out in various degree little depress rolling, thereby make steel plate that in various degree distortion occur.For different substrates, can be with the polishing elongation control in different scopes.
In one embodiment of the invention, substrate is carbon aluminium-killed steel, by the different plating bath of hot-dip, can make carbon aluminium-killed steel heat zinc coating plate or carbon aluminium-killed steel hot dip aluminum zinc plate.Because carbon, nitrogen-atoms in the carbon aluminium-killed steel diffuse to easily the dislocation place and form dislocation group, without too small when depressing predeformation (polishing), along with the distortion in the subsequent production (for example punching press), the stress-strain diagram of low carbon aluminum-killed steel plate at larger region memory at yield point elongation (yield point elongation), thereby can make steel plate produce strain mark.And through too small depress predeformation (polishing) after, carbon aluminium-killed steel produces certain even extension under the roll-force effect of polishing, then can eliminate the yield point elongation phenomenon, and plate shape is improved.And some zinc granules of surface of steel plate, roll marks, scratch etc. also can be alleviated or be eliminated, thereby improve the surface quality of steel plate.Therefore, polishing percentage elongation δ can be controlled at 0.6-1.2% to eliminate the yield point elongation of low carbon aluminum-killed steel plate.That is to say that under the preferable case, when described hot-dip coated steel sheet is the substrate of hot-dip galvanizing sheet steel or hot-dip aluminizing zincium steel plate, described hot-dip coated steel sheet when being carbon aluminium-killed steel, described rolling percentage elongation δ is in the 0.6-1.2% scope.Among the present invention, described rolling percentage elongation δ refers to that the thickness difference of the hot-dip coated steel sheet of rolling front and back accounts for the percentage of the thickness of the hot-dip coated steel sheet before rolling.The roll-force that obtains the percentage elongation of the rolling is preferably 180-350KN, and tension force is preferably 50-90KN.
In another embodiment of the invention, substrate is IF steel (gapless atomic steel), by the different plating bath of hot-dip, can make IF steel heat zinc coating plate or IF steel hot dip aluminum zinc plate.In the IF steel, almost do not have the interstitial atom of the free carbon, nitrogen and so on of solid solution to exist in the ferrite, thereby have very good punch forming performance.Although polishing can make some zinc granules, roll marks, scratch of IF surface of steel plate etc. also can be alleviated or eliminate, thereby improve the surface quality of steel plate.But polishing is depressed the punching performance variation that predeformation can make the IF steel to what the IF steel carried out.Therefore, for the punching performance of balance IF steel with to the surface quality requirement of zinc coat, polishing percentage elongation δ can be controlled at 0.3-1.0%.That is to say that under the preferable case, when described hot-dip coated steel sheet is the substrate of hot-dip galvanizing sheet steel or hot-dip aluminizing zincium steel plate, described hot-dip coated steel sheet when being the IF steel, described rolling percentage elongation δ is in the 0.3-1.0% scope.Rolling force F
RBe controlled at 100-200KN (tension force is controlled at 30-70KN).
The method of finishing hot-dip coated steel sheet provided by the invention is described below by embodiment.
Wherein, embodiment 1 to embodiment 4 uses polishing method of the present invention carbon aluminium-killed steel heat zinc coating plate DX52D+Z to be carried out the embodiment of polishing; Embodiment 5 to embodiment 8 uses polishing method of the present invention carbon aluminium-killed steel hot dip aluminum zinc plate DX52D+AZ to be carried out the embodiment of polishing; Embodiment 9 to embodiment 12 uses polishing method of the present invention IF steel heat zinc coating plate DX54D+Z to be carried out the embodiment of polishing; Embodiment 13 to embodiment 16 uses polishing method of the present invention IF steel heat zinc coating plate DX54D+AZ to be carried out the embodiment of polishing.
Embodiment 1
Present embodiment is used for illustrating the method for finishing hot-dip coated steel sheet provided by the invention.
Use the polishing roll that thickness is 180g/m as 0.8mm, coating surface density
2Carbon aluminium-killed steel heat zinc coating plate DX52D+Z (coating is Zn 98 % by weight-Al2 % by weight) be rolled, rolling condition comprises rolling force F
RBe 220KN, tension force is 90KN, and the percentage elongation of polishing is 0.62%, the surface roughness Ra of polishing roll
0, the hot-dip steel plate before the polishing surface roughness Ra
1And before the polishing zinc flower than the roughness of light with than the discrepancy delta Ra between the roughness of dark-part
1As shown in table 1 respectively.The surface roughness Ra of hot-dip steel plate behind the polishing
2And behind the polishing zinc flower than the roughness of light with than the discrepancy delta Ra between the roughness of dark-part
2As shown in table 1 respectively.The hot-dip steel surface roughness is measured by T800 three-dimensional appearance instrument.
Embodiment 2-4
Following examples are used for illustrating the method for finishing hot-dip coated steel sheet provided by the invention.
Method according to embodiment 1 is rolled (being polishing) to carbon aluminium-killed steel heat zinc coating plate DX52D+Z, and different is that rolling condition is as shown in table 1.The surface roughness Ra of hot-dip steel plate behind the polishing
2And behind the polishing zinc flower than the roughness of light with than the discrepancy delta Ra between the roughness of dark-part
2As shown in table 1 respectively.
Comparative Examples 1
Method according to embodiment 1 is rolled (being polishing) to carbon aluminium-killed steel heat zinc coating plate DX52D+Z, and different is that rolling condition is as shown in table 1.The surface roughness Ra of hot-dip steel plate behind the polishing
2And behind the polishing zinc flower than the roughness of light with than the discrepancy delta Ra between the roughness of dark-part
2As shown in table 1 respectively.
Embodiment 5-8
Following examples are used for illustrating the method for finishing hot-dip coated steel sheet provided by the invention.
Method according to embodiment 1 is that 1.2mm, coating surface density are 120g/m to steel plate thickness
2Carbon aluminium-killed steel hot dip aluminum zinc plate DX52D+AZ (coating is Al 55 % by weight-Si1.6 % by weight-43.4 % by weight) be rolled (being polishing), different is, adopt rolling condition as shown in table 1, the outward appearance before the carbon aluminium-killed steel hot dip aluminum zinc plate polishing as shown in Figure 1.The surface roughness Ra of hot-dip steel plate behind the polishing
2And behind the polishing zinc flower than the roughness of light with than the discrepancy delta Ra between the roughness of dark-part
2As shown in table 1 respectively.
Wherein, Fig. 3 is direct photo with the hot-dip aluminizing zincium steel plate behind the embodiment 5 gained polishings of camera acquisition under shooting environmental.Fig. 4 is the stress-strain diagram of the carbon aluminium-killed steel hot dip aluminum zinc plate DX52D+AZ behind the embodiment 1 gained polishing.As shown in Figure 4, there is not yield point elongation in this stress-strain diagram, that is to say the yield point elongation of having eliminated carbon aluminium-killed steel by polishing method of the present invention.
Comparative Examples 2
Method according to embodiment 5 is rolled (being polishing) to carbon aluminium-killed steel hot dip aluminum zinc plate DX52D+AZ, and different is that rolling condition is as shown in table 1.The surface roughness Ra of hot-dip steel plate behind the polishing
2And behind the polishing zinc flower than the roughness of light with than the discrepancy delta Ra between the roughness of dark-part
2As shown in table 1 respectively.
Wherein, Fig. 2 is direct photo with the hot-dip aluminizing zincium steel plate behind the Comparative Examples 2 gained polishings of camera acquisition under shooting environmental.
Wherein, Fig. 1, Fig. 2 are the photo (not through amplifying) that directly obtains with camera with Fig. 3 under identical shooting environmental.
Table 1
| Title | F R/KN | δ/％ | Ra 0/μ m | Ra 1/μ m | Ra 2/μ m | ΔRa 1/μm | ΔRa 2/μm |
| Embodiment 1 | 220 | 0.62 | 0.81 | 0.32 | 0.30 | 0.05 | 0.07 |
| Embodiment 2 | 180 | 0.63 | 0.34 | 0.35 | 0.34 | 0.07 | 0.08 |
| Embodiment 3 | 280 | 1.06 | 0.57 | 0.35 | 0.40 | 0.08 | 0.10 |
| Embodiment 4 | 350 | 1.20 | 0.90 | 0.39 | 0.35 | 0.10 | 0.12 |
| |
220 | 0.65 | 0.81 | 0.32 | 0.44 | 0.05 | 0.08 |
| Embodiment 6 | 180 | 0.60 | 0.34 | 0.35 | 0.33 | 0.07 | 0.09 |
| Embodiment 7 | 280 | 1.10 | 0.57 | 0.35 | 0.29 | 0.08 | 0.11 |
| Embodiment 8 | 350 | 1.19 | 0.90 | 0.39 | 0.32 | 0.11 | 0.13 |
| Comparative Examples 1 | 220 | 0.62 | 2.45 | 0.32 | 1.08 | 0.05 | 0.00 |
| Comparative Examples 2 | 220 | 0.65 | 2.45 | 0.32 | 0.98 | 0.05 | 0.00 |
From the results shown in Table 1, the surface roughness of carbon aluminium-killed steel hot dip aluminum zinc plate is 0.32 μ m (embodiment 5) before the polishing, is 0.05 μ m than the roughness of light with than the difference between the roughness of dark-part.The surface roughness of using traditional texturing polishing roll is 2.45 μ m (Comparative Examples 2).As shown in Figure 2, original on the carbon aluminium-killed steel hot dip aluminum zinc plate surface behind the polishing no longer have original roughness difference than light with than dark-part, and surface of steel plate almost can't be differentiated than light with than dark-part.That is to say that surface of steel plate has obtained uniform roughness (0.98 μ m), the profile of zinc flower can be recognized hardly.And use method of the present invention, and for example embodiment 5, and the use surface roughness is after the polishing roll of 0.81 μ m carries out polishing, and it is apparent than light with than the roughness difference between the dark-part (0.08 μ m) to have kept making zinc to spend.In addition, the surface roughness of carbon aluminium-killed steel hot dip aluminum zinc plate is 0.44 μ m, and this compares with surface roughness 0.32 μ m before the polishing and changes not quite, and the surface roughness transmission efficiency of bringing of having reacted equally polishing is lower.As shown in Figure 3, the clear-cut of zinc flower as seen.
Embodiment 9
Present embodiment is used for illustrating the method for finishing hot-dip coated steel sheet provided by the invention.
Use the polishing roll that thickness is 180g/m as 0.8mm, coating surface density
2IF steel heat zinc coating plate DX54D+Z (coating is Zn98 % by weight-Al2 % by weight) be rolled, rolling condition comprises rolling force F
RBe 200KN, tension force is 70KN, and the percentage elongation of polishing is 1.0%, the surface roughness Ra of polishing roll
0, the hot-dip steel plate before the polishing surface roughness Ra
1And before the polishing zinc flower than the roughness of light with than the discrepancy delta Ra between the roughness of dark-part
1As shown in table 2 respectively.The surface roughness Ra of hot-dip steel plate behind the polishing
2And behind the polishing zinc flower than the roughness of light with than the discrepancy delta Ra between the roughness of dark-part
2As shown in table 2 respectively.The hot-dip steel surface roughness is measured by T800 three-dimensional appearance instrument.
Embodiment 10-12
Following examples are used for illustrating the method for finishing hot-dip coated steel sheet provided by the invention.
Method according to embodiment 9 is rolled (being polishing) to IF steel heat zinc coating plate DX54D+Z, and different is that rolling condition is as shown in table 2.The surface roughness Ra of hot-dip steel plate behind the polishing
2And behind the polishing zinc flower than the roughness of light with than the discrepancy delta Ra between the roughness of dark-part
2As shown in table 2 respectively.
Comparative Examples 3
Method according to embodiment 9 is rolled (being polishing) to IF steel heat zinc coating plate DX54D+Z, and different is that rolling condition is as shown in table 2.The surface roughness Ra of hot-dip steel plate behind the polishing
2And behind the polishing zinc flower than the roughness of light with than the discrepancy delta Ra between the roughness of dark-part
2As shown in table 2 respectively.
Embodiment 13-16
Following examples are used for illustrating the method for finishing hot-dip coated steel sheet provided by the invention.
Method according to embodiment 9 is that 1.2mm, coating surface density are 150g/m to steel plate thickness
2IF steel hot dip aluminum zinc plate DX54D+AZ (coating is Al 55 % by weight-Si1.6 % by weight-Zn 43.4 % by weight) be rolled (being polishing), different is to adopt rolling condition as shown in table 2.The surface roughness Ra of hot-dip steel plate behind the polishing
2And behind the polishing zinc flower than the roughness of light with than the discrepancy delta Ra between the roughness of dark-part
2As shown in table 2 respectively.
Comparative Examples 4
Method according to embodiment 9 is rolled (being polishing) to IF steel heat zinc coating plate DX54D+AZ, and different is that rolling condition is as shown in table 2.The surface roughness Ra of hot-dip steel plate behind the polishing
2And behind the polishing zinc flower than the roughness of light with than the discrepancy delta Ra between the roughness of dark-part
2As shown in table 2 respectively.
Table 2
| Title | F R/KN | δ/％ | Ra 0/μm | Ra 1/μm | Ra 2/μm | ΔRa 1/μm | ΔRa 2/μm |
| Embodiment 9 | 200 | 1.0 | 0.81 | 0.28 | 0.31 | 0.05 | 0.07 |
| |
100 | 0.54 | 0.34 | 0.32 | 0.29 | 0.07 | 0.09 |
| Embodiment 11 | 130 | 0.79 | 0.57 | 0.34 | 0.33 | 0.09 | 0.11 |
| Embodiment 12 | 180 | 0.96 | 0.90 | 0.30 | 0.42 | 0.10 | 0.13 |
| Embodiment 13 | 200 | 1.0 | 0.81 | 0.34 | 0.35 | 0.05 | 0.06 |
| Embodiment 14 | 100 | 0.46 | 0.34 | 0.30 | 0.33 | 0.07 | 0.08 |
| Embodiment 15 | 130 | 0.78 | 0.57 | 0.31 | 0.32 | 0.09 | 0.11 |
| Embodiment 16 | 180 | 0.99 | 0.90 | 0.31 | 0.27 | 0.10 | 0.12 |
| Comparative Examples 3 | 200 | 1.0 | 2.45 | 0.34 | 1.09 | 0.05 | 0 |
| Comparative Examples 4 | 200 | 1.0 | 2.45 | 0.34 | 1.10 | 0.05 | 0 |
Behind the use conventional method polishing (such as Comparative Examples 3 and Comparative Examples 4), surface of steel plate no longer has significantly than light with than dark-part, zinc floral whorl exterior feature is smudgy, originally be eliminated than light and roughness difference than dark-part, steel plate has uniform roughness and this roughness greater than polishing front spring surface roughness.And after using polishing method of the present invention, still exist than light with than the roughness difference of dark-part, so that the zinc of surface of steel plate flower clear-cut, the good appearance that has basically kept before the polishing is ornamental.Although the punching performance of IF steel decreases behind the polishing, for example, use the method polishing of embodiment 9 after, the yield strength of IF steel and tensile strength about 20Mpa that raises, the reduction of n value is about 0.05, Δ r value reduction about 0.1.But the punching performance that is somebody's turn to do behind reduction and the conventional method polishing is basic identical, belongs to acceptable scope, does not affect the normal use of IF steel plate, satisfies the punching press requirement.
The method of finishing hot-dip coated steel sheet of the present invention also is applicable to have other hot-dip coated steel plate, can improve surface quality and the appearance effect of steel plate.
Claims (6)
1. the method for a finishing hot-dip coated steel sheet, the method comprises uses the polishing roll that hot-dip coated steel sheet is rolled, it is characterized in that, the surface roughness Ra of described polishing roll is 0.1-0.5 μ m, and make described hot-dip coated steel sheet remain on 0.05-0.15 μ m than light with than the roughness difference of dark-part.
2. method according to claim 1, wherein, described hot-dip coated steel sheet is hot-dip galvanizing sheet steel or hot-dip aluminizing zincium steel plate.
3. method according to claim 1, wherein, the substrate of described hot-dip coated steel sheet is carbon aluminium-killed steel.
4. according to claim 2 or 3 described methods, wherein, rolling percentage elongation is 0.6-1.2%.
5. method according to claim 1, wherein, the substrate of described hot-dip coated steel sheet is gapless atomic steel.
6. according to claim 2 or 5 described methods, wherein, rolling percentage elongation is 0.3-1.0%.
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| CN102330045B (en) * | 2011-09-07 | 2013-12-25 | 河北钢铁股份有限公司唐山分公司 | Hot dip galvanizing product surface spangle state control method |
| CN103544403B (en) * | 2013-11-07 | 2016-06-29 | 武汉钢铁(集团)公司 | The quantitative description of galvanized sheet surface color degree |
| CN103934282B (en) * | 2014-04-18 | 2016-06-01 | 河北钢铁股份有限公司唐山分公司 | The whole straightening tension control method of the light of a kind of deep-draw steel plate galvanized |
| CN108642421A (en) * | 2018-05-15 | 2018-10-12 | 首钢集团有限公司 | A kind of production method of galvanized steel plain sheet |
| DE102020200326A1 (en) * | 2020-01-13 | 2021-07-15 | Thyssenkrupp Steel Europe Ag | Process for the production of a surface-refined and surface-conditioned steel sheet |
| CN113528764B (en) * | 2021-06-02 | 2022-07-19 | 广西柳钢华创科技研发有限公司 | Method for improving quality of passivation film of galvanized product |
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| 王业科."光整机及其在热镀锌生产线上的应用".《轧钢》.2002,第19卷(第4期),第55-57页. |
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| CN101905240A (en) | 2010-12-08 |
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