CA2054527A1 - Method of producing galvanized steel sheets having a good workability - Google Patents
Method of producing galvanized steel sheets having a good workabilityInfo
- Publication number
- CA2054527A1 CA2054527A1 CA002054527A CA2054527A CA2054527A1 CA 2054527 A1 CA2054527 A1 CA 2054527A1 CA 002054527 A CA002054527 A CA 002054527A CA 2054527 A CA2054527 A CA 2054527A CA 2054527 A1 CA2054527 A1 CA 2054527A1
- Authority
- CA
- Canada
- Prior art keywords
- treatment step
- hot dip
- metal
- galvanized layer
- galvanizing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims abstract description 36
- 239000008397 galvanized steel Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000011282 treatment Methods 0.000 claims abstract description 96
- 229910052751 metal Inorganic materials 0.000 claims abstract description 68
- 239000002184 metal Substances 0.000 claims abstract description 68
- 238000005246 galvanizing Methods 0.000 claims abstract description 57
- 230000001680 brushing effect Effects 0.000 claims abstract description 37
- 239000003973 paint Substances 0.000 claims abstract description 29
- 239000010410 layer Substances 0.000 claims description 67
- 229920003002 synthetic resin Polymers 0.000 claims description 20
- 239000000057 synthetic resin Substances 0.000 claims description 20
- 229910045601 alloy Inorganic materials 0.000 claims description 11
- 239000000956 alloy Substances 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 239000011247 coating layer Substances 0.000 claims description 9
- 239000004033 plastic Substances 0.000 claims description 8
- 229920003023 plastic Polymers 0.000 claims description 8
- 229910000611 Zinc aluminium Inorganic materials 0.000 claims description 7
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 6
- 238000007711 solidification Methods 0.000 claims description 6
- 230000008023 solidification Effects 0.000 claims description 6
- 229910001369 Brass Inorganic materials 0.000 claims description 5
- 239000010951 brass Substances 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- 239000011701 zinc Substances 0.000 claims description 4
- 238000010422 painting Methods 0.000 claims description 2
- 238000010030 laminating Methods 0.000 claims 2
- 229910000831 Steel Inorganic materials 0.000 description 18
- 239000010959 steel Substances 0.000 description 18
- 238000005336 cracking Methods 0.000 description 16
- 238000005260 corrosion Methods 0.000 description 9
- 230000007797 corrosion Effects 0.000 description 9
- 238000005452 bending Methods 0.000 description 8
- 238000005406 washing Methods 0.000 description 6
- 238000005422 blasting Methods 0.000 description 4
- 238000005238 degreasing Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000004677 Nylon Substances 0.000 description 3
- 229920001778 nylon Polymers 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910001092 metal group alloy Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- -1 piano wire Inorganic materials 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- 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
- C23C2/26—After-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating With Molten Metal (AREA)
Abstract
Abstract of the Disclosure In a method of producing galvanized steel sheets having a good workability through preliminary treatment step for hot dip galvanizing, hot dip galvanizing treatment step and post treatment step for hot dip galvanizing or further paint finishing treatment step, a surface of the resulting galvanized layer is subjected to a brushing treatment with a metal wire brush at the post treatment step.
Description
2 ~ 2 ~
METHOD OF PRODUCING GALVANIZXD STEEL SHEETS HAVING A GOOD
WORKABILITY
BACKGROUND OF T~E INVENTION
FIELD OF THE INVENTION
The present invention relates to a method of producing galvanized steel sheets having a good workability, and proposes a technique of reinforcing a galvanized layer effective for preventing the cracking of the galvanized layer at a worked portion.
Moreover, the term "galvanized steel sheet" used herein means steel sheets each provided at its surface with a hot dip zinc coated layer or hot dip zinc-aluminum alloy coated layer, which layer may contain a small amount of other elements such as magnesium, rare earth metal and so on, as well as painted-galvanized steel sheets each finished at the surface of the galvanized layer with a synthetic resin or laminated with a synthetic resin film.
Further, the form of the galvanized layer may be spangle or minimized spangle steel sheets.
DISCLOSURE OF RELATED ART
In general, it is known that when the galvanized steel sheet or hot dip zinc-aluminum coated steel sheet is subjected to a bending work, the cracking is caused in the galvanized layer at the bending position and hence the corrosion resistance after the working is considerably deteriorated. Such a phenomenon is observed in the case ~3~-'3 of painted-galvanized steel sheets obtained by forming the coating layer of the synthetic resin on the galvanized layer of the sheet. That is, the cracking caused on the underground galvanized layer in the working is propagated to the coating layer, whereby the cracking is caused in the coating layer to considerably degrade the corrosion resistance in the worked portion.
Therefore, it is usual to exclude the worked portion from the steel sheet for the guarantee of corrosion resistance. However, it has been desired to guarantee galvanized steel sheets inclusive of the worked portion as a whole.
Under such circumstances, there have hitherto been proposed a method wherein the galvanized layer of the galvanized steel sheet is subjected to a light cold rolling and further to recrystallization heating treatment ~Japanese Patent laid open No. 58-84963), a method wherein the surface of the galvanized layer is subjected to blasting treatment (Japanese Patent laid open No. 59-6363 and No. 62-60853) and the like.
In the conventional former technique, however, the rolling mill and the annealing furnace should be arranged back the galvanizing device, so that the equipmental cost becomes excessive and also the occurrence of cracking in the galvanized layer at the worked position can not sufficiently be prevented.
In the conventional latter technique, when the 2 ~ r~
blasting device is arranged in a line, there are many technical obstructions, so that it is not actually put into practical use. That is, in case of arranging the blasting device in the continuous hot dip galvanizing line, a large-scale equipment is required for the sieving cycle of shot particles and there is a fear of remaining component of the shot particle on the surface of the product, so that it is difficult to completely prevent this problem.
Moreover, the thinning of the galvanized layer is known as another method of improving the workability of the galvanized layer, which has such a fundamental drawback that the sufficient corrosion resistance is not obtained.
SUMMARY OF THE INVENTION
It is, therefore, an object of the invention to develop a method effective for preventing the cracking of the galvanized layer at the worked position without causing the aforementioned problems in the light cold rolling or the blasting.
In order to achieve the above object or to prevent the degradation of the corrosion resistance of the worked portion in the galvanized steel sheet, it is necessary to prevent the occurrence of cracking in the galvanized layer at the worked position in the working of the galvanized steel sheet, whereby the corrosion resistance of the bending worked portion can be made 2 ~ 2 7 almos-t equal to that of the non-worked portion.
The inventors have made various studies with -respect to the production method of galvanized steel sheets not causing the cracking in the galvanized layer during the bending work. As a result, it has been found that when the surface of the galvanized layer in the galvanized steel sheet is subjected to a brushing treatment with a metal wire brush, the workability of the galvanized layer is considerably improved and the cracking in the galvanized layer due to the usual bending work can be prevented sufficiently.
Further, it has been found that even when the synthetic resin having excellent corrosion resistance is applied to the galvanized layer or the film of synthetic resin is laminated on the galvanized layer to form a painted-galvanized steel sheet having a so-called coating layer, there is no cracking in the galvanized layer on the base sheet and no propagation thereof and hence steel sheets having excellent corrosion resistance at the worked portion are obtained.
According to a first aspect of the invention, there is the provision of a method of producing galvanized steel sheets having a good worka~ility through preliminary treatment step for hot dip galvanizing, hot dip galvanizing treatment step and post treatment step for hot dip galvanizing, which comprises subjecting a surface of a galvanized layer to a brushing treatment with a metal wire . .
2Q~ 27 brush at said post treatment step.
According to a second aspect of the invention, there is the provision of a method of producing galvanized steel sheets having a good workability through preliminary treatment step for hot dip galvanizing, hot dip galvanizing treatment step, post treatment step for hot dip galvanizing and paint finishing treatment step with a synthetic resin on a surface of a galvanized layer, which comprises subjecting said surface of the galvanized layer to a brushing treatment with a metal wire brush at said post treatment step.
According to a third aspect of the invention, there is the provision of a method of producing galvanized steel sheets having a good workability through preliminary treatment step for hot dip galvanizing, hot dip galvanizing treatment step, post -treatment step for hot dip galvanizing and paint finishing treatment step with a synthetic resin on a surface of a galvanized layer, which comprises subjecting said surface of the galvanized layer to a brushing treatment with a metal wire brush at said paint finishing treatment step.
The hot dip galvanized steel sheet of the above struc-ture according to the invention is anyone of galvanized steel sheet, hot dip zinc-aluminum alloy coated steel sheet, and paint-galvanized steel sheet provided at the surface with a coating layer of synthetic resin.
According to the invention, a metal brush roll 2Q~?J~
obtained by providing metal or alloy wires of not less than 0.05 mm in diameter such as stainless steel wire, piano wire, brass wire or the like on a surface of roll drum is used as the metal wire brush.
The brushing treatment is preferably carried out by pushing the metal brush roll rotating at not less than 300 rpm onto the surface of the galvanized layer, whereby plastic deformation is given to the galvanized layer.
Moreover, the rotating speed is not limited to the above value because it is dependent upon the roll diameter.
In a preferred embodiment of the invention, the brushing treatment is carried out by arranging the metal brush roll at any position ranging from the solidification of hot dip galvanizing metal to the coiling thereof in the post treatment step for the galvanizing.
In the above construction of the invention, the metal brush roll is arranged between the cooling device and the skin pass rolling mill in the post treatment step for the galvanizing.
In another preferred embodiment of the invention, the brushing treatment is carried out by arranging the metal brush roll in the paint finishing treatment step.
In the above construction of the invention, the metal brush roll is arranged between the pay-off reel and the paint preliminary treating device in the paint finishing treatment step.
2 ~ ~ ~ ~ 2 r~
BRIEF DESCRIPTION OF THE DRAWING
Fig. 1 is a schematic view showing an outline of a continuous hot dip galvanizing installation; and Fig. 2 is a schematic view showing an outline of a continuous paint finishing line.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The invention is a method of brushing the surface of the galvanized layer. The reason why the occurrence of the cracking in the bend-worked portion of the galvanized layer is prevented by brushing the surface of the galvanized layer is considered as follows. That is, when the surface of the galvanized layer is subjected to the brushing treatment, mobile dislocations are introduced into the galvanized layer, whereby it is considered that the galvanized layer easily creates plastic deformation. According to the inventors' experience, the occurrence of cracks is disappeared by the brushing treatment of the galvanized layer even in the bending work.
According to the method of the invention, the workability of the galvanized layer is improved by subjecting the surface of the galvanized layer in the hot dip galvanized steel sheet, which is immersed in and passed through a hot dip galvanizing bath or a hot dip zinc-aluminum alloy coating bath, to a brushing treatment with a metal wire brush.
Such a brushing treatment is carried out at a 2 ~3! r l~ ' - r~
post treatment step after the galvanizing or at a subsequent paint finishing step. In the former case, the metal wire brush is arranged in any position ranging from the solidification of the hot dip galvanizing metal to the coiling thereof, while in the latter case, -the metal wire brush is arranged in any position at the pain finishing step.
The arranging position of the metal wire brush is between the cooling device and the skin pass roll or leveler roll at the post treatment step after the galvanizing. The reason on the limitation of such a position is due to the fact that the plastic deformation can not be given to the galvanizing metal before the solidification and the surface of the galvanized metal somewhat roughened by the brushing treatment can be tempered by skin pass treatment. The galvanized steel sheet subjected to the brushing treatment may be rendered into a product after chromate trea-tment.
Furthermore, when the painted-galvanized steel sheet is produced as another preferred embodiment, the coating layer is formed at the paint finishing step after the brushing of the galvanized layer at the post treatment step for the galvanizing, or the brushing treatment is conducted at the paint finishing step followed by the post treatment step. In this case, a synthetic resin such as polyester resin, epoxy resin, fluorocarbon resin, vinyl chloride resin or the like is applied onto the galvanized 2 ~ 2 7 layer, or a film of the above synthetic resin is laminated on the galvanized layer to form a coating layer, whereby a painted-galvanized steel sheet can be obtained.
In the above embodiment, the metal wire brush is arranged between a pay-off reel and a preliminary treatment device for paint at the paint finishing step, whereby the brushing treatment may be conducted. More preferably, the brushing treatment may be conducted between a looper roll at entrance side and a degreasing-washing device in the paint finishing line. The reason on the limitation of such a position is due to the fact that when the brushing treatment is conducted after the preliminary treatment for paint, the preliminarily treated film is broken, while when the metal wire brush is located at the back of the entrance-side looper roll, there is no influence of line rate to the treatability and also the impurity is easily removed by the degreasing and washing.
The generally known brushing treatment is conduc-ted in the washing line for the removal of contaminant from the surface of the steel sheet or the surface activation. Such a general brushing treatment is used for rubbing surface contaminant with, for example, a nylon brush, or for removing surface oxide and the like by polishing with a nylon brush containing grindstones.
However, these brushes used in the preliminary treatment for a so-called surface treatment do not develop the effect of causing plastic deformation on the galvanized _g_ 2 ~ 2 1 layer to improve the workability of the galvanized layer as in the invention.
In the invention, therefore, it is required to use the metal brush instead of the nylon brush. For example, hard metal or alloy wires such as stainless wire, piano wire, brass wire and the like may be used in the metal brush. In this case, when the diameter of the wire is too fine, the brushing effect is lost, so that the diameter of the wire constituting the brush body is not less than 0.05 mm, preferably 0.2-0.5 mm. Further, in order to conduct the brushing treatment with the metal wire brush in the production line, it is effective to stand metal wires having a length of about 50-150 mm onto a roll drum to form a metal brush roll. Moreover, when the rotating rate of the metal brush roll is too small, there is obtained no effect, so that the rotating rate is preferably not less than 300 rpm, more preferably 800-3000 rpm. In addition, it is preferable to rotate the metal brush roll under a light pushing force.
These conditions for the metal brush roll are important to give a proper plastic deformation to the surface of the galvanized layer. If the brushing treatment with the metal brush roll is carried out outside the above conditions, the effect of improving the desired workability of the galvanized layer is not obtained.
The following examples are given in the illustration of the invention but are not intended as limitations thereof.
In Fig. 1 is shown an outline of the continuous hot dip galvanizing line according to a first embodiment of the invention. A preliminary treatment step for galvanizing located at an upstream side of the continuous hot dip galvanizing line is a step that a steel sheet S
delivered from a pay-off reel 1 is transferred to an annealing furnace 5 through a welder 2, an entrance-side looper 3 and a degreasing and washing device 4 and heated in a reducing atmosphere. The thus surface-activated steel sheet is passed through a hot dip metal pot 6 in the galvanizing step to adhere a hot dip metal to the surface of the steel sheet and then passed through a wiping nozzle 7 to adjust the weight to be adhered. In the post treatment step for the galvanizing, the galvanized steel sheet is passed through an alloying furnace 8 or a minimized spangle forming device, if necessary, and then wound on a coiler 15 through a cooling device 9, a skin pass rolling mill 10, a leveler 11, a phosphating tank 12, a delivery-side looper 13 and a shearing machine 14.
In the illustrated embodiment, a metal brush roll 16 made from metal or metal alloy wires is arranged at an adequate position ranging from solidification of the hot dip galvanized metal to the delivery-side looper in the above post treatment step for the galvanizing in the continuous hot dip galvanizing line. In Fig. 1 is shown an arrangement of the metal brush roll between the cooling 2 Q ~
device 9 and the skin pass rolling mill 10.
In Fig. 2 is another embodiment of the invention, in which a continuous paint finishing step starting from a pay-off reel 21 is arranged at the back of the coiler 15 in the aforementioned post treating step for the galvanizing. In a first half of this paint finishing step, the steel sheet S delivered from the pay-off reel 21 is transferred to a preliminary treatment device for painting through a welder 22, an entrance-side looper 23 and a degreasing and washing device 24, at where the steel sheet is subjected to a treatment with a phosphate or chromate. Then, the thus surface-activated steel sheet is passed through an undercoating device 26, a baking device 27, a top coating device 28 and a baking device 29 to coat the surface of the sheet with a synthetic resin.
Thereafter, the paint finished steel sheet is passed through a post treatment device, if necessary, and wound about a coiler 33 through a delivery-side looper 31 and a shearing machine 32.
In the latter embodiment, a metal brush roll 34 made from metal or metal alloy wires may be arranged between the pay-off reel 21 and the degreasing and washing device 24, particularly immediately at the back of the entrance-side looper 23 in the continuous paint finishing treating step.
(1) Example 1: Metal brush rolls 10, 34 having a roll outer diameter of 300 mm and a roll width of 1000 mm and 2~4~27 provided with stainless steel wires (SUS 304) having a diameter of 0.3 mm were arranged at the back of the cooling device 9 in the post treatment step of the continuous hot dip galvanizing apparatus shown in Fig. 1 and at the back of the entrance-side looper 23 in the continuous paint finishing line shown in Fig. 2, respectively. These metal brush roll was rotated at 1500 rpm and pushed onto the surface of the galvanized layer to conduct brushing treatment. Moreover, the metal brush rolls arranged in the above lines could be escaped from these lines, so that the galvanizing was conducted without the brushing treatment for comparison.
Various hot dip galvanized steel sheets, and painted-galvanized steel sheets coated with polyester resin were manufactured by varying conditions such as thickness of steel sheet, composition of the galvanized layer, galvanizing amount, size of spangle and the like.
Then, the change of workability was examined in the presence or absence of the brushing treatment at the post treatment step or the paint finishing step. Moreover, the workability was judged by observing a bent portion after Ot bending by means of a loupe according to a judgement standard as shown in table 1.
In Table 2 are shown results evaluated on the workability in the galvanized steel sheets and paint finished steel sheets coated with the synthetic resin.
2 ~ ~ ~ i 2~
Table 1 _ _ Judgement ~tandard of workability _ __. _ 1 cracking is conspicuous, separation locally is observed 2 large cracking is observed over full surface 3 cracking is substantially observed over full surface 4 small cracking is locally observed no cracking is observed 2 ~ ~ ~ ~ 2 rl Table_2 Change of workability in galvanized steel sheets and paint finished galvanized steel sheets in the presence or absence of brushing treatment ~Kind of 1 _ - ¦ Worka- ¦ Workability¦
galvan- Thick- Amount Brushing bility of paint izing ness adhered Spangle treatment of gal- finished metal (mm) g/m2 sheet*1 *2 GI 0.22 120 regular presence 5 5 absence 3 3 0.35 120 minimum presence 5 5 5 absence 3 3 3 0.50 ¦250 minimum presence 5 4 5 absence 3 3 3 1.80 250 regular presence 4 4 absence 3 3 GF 0.35 180 regular presence 5 5 absence 4 4 0.40 250 regular ¦ presence 5 5 ¦ 5 absence 3 3 j 3 GL 0.27150 regular presence 3 4 absence 2 2 0.40150 regrlar presence 3 ~
absence 2 2 Note: The amount galvanizing metal adhered means an amount adhered to both surface of the sheets *1: Brushing treatment is carried out at the post treatment step for hot dip galvanizing *2: Brushing treatment is carried out at the paint finishing treatment step 205a~,2r~
As seen from the above results, the effect of the galvanized steel sheets according to the invention is remarkable; that is, the workability is considerably improved by the brushing treatment. Further, it is obvious that the similar results are always recognized even when the galvanizing is usual galvanizing (GI), hot dip Zn-5% Al alloy coating (Galfan; GF) or hot dip Zn-55%
Al alloy coating (Galvalume; GL), or even when the thickness, galvanizing amount or spangle shape is varied, or even when the synthetic resin is applied to or the film of the synthetic resin is laminated onto the surface of the galvanized layer.
As mentioned above, according to the invention, the workability of the galvanized layer in the galvanized steel sheets is improved, and particularly no cracklng is caused in the worked portion of the galvanized layer even when the galvanized layer is subjected to a bending work, so that galvanizecl steel sheets and painted-galvanized steel sheets having considerably improved corrosion resistance can be produced.
METHOD OF PRODUCING GALVANIZXD STEEL SHEETS HAVING A GOOD
WORKABILITY
BACKGROUND OF T~E INVENTION
FIELD OF THE INVENTION
The present invention relates to a method of producing galvanized steel sheets having a good workability, and proposes a technique of reinforcing a galvanized layer effective for preventing the cracking of the galvanized layer at a worked portion.
Moreover, the term "galvanized steel sheet" used herein means steel sheets each provided at its surface with a hot dip zinc coated layer or hot dip zinc-aluminum alloy coated layer, which layer may contain a small amount of other elements such as magnesium, rare earth metal and so on, as well as painted-galvanized steel sheets each finished at the surface of the galvanized layer with a synthetic resin or laminated with a synthetic resin film.
Further, the form of the galvanized layer may be spangle or minimized spangle steel sheets.
DISCLOSURE OF RELATED ART
In general, it is known that when the galvanized steel sheet or hot dip zinc-aluminum coated steel sheet is subjected to a bending work, the cracking is caused in the galvanized layer at the bending position and hence the corrosion resistance after the working is considerably deteriorated. Such a phenomenon is observed in the case ~3~-'3 of painted-galvanized steel sheets obtained by forming the coating layer of the synthetic resin on the galvanized layer of the sheet. That is, the cracking caused on the underground galvanized layer in the working is propagated to the coating layer, whereby the cracking is caused in the coating layer to considerably degrade the corrosion resistance in the worked portion.
Therefore, it is usual to exclude the worked portion from the steel sheet for the guarantee of corrosion resistance. However, it has been desired to guarantee galvanized steel sheets inclusive of the worked portion as a whole.
Under such circumstances, there have hitherto been proposed a method wherein the galvanized layer of the galvanized steel sheet is subjected to a light cold rolling and further to recrystallization heating treatment ~Japanese Patent laid open No. 58-84963), a method wherein the surface of the galvanized layer is subjected to blasting treatment (Japanese Patent laid open No. 59-6363 and No. 62-60853) and the like.
In the conventional former technique, however, the rolling mill and the annealing furnace should be arranged back the galvanizing device, so that the equipmental cost becomes excessive and also the occurrence of cracking in the galvanized layer at the worked position can not sufficiently be prevented.
In the conventional latter technique, when the 2 ~ r~
blasting device is arranged in a line, there are many technical obstructions, so that it is not actually put into practical use. That is, in case of arranging the blasting device in the continuous hot dip galvanizing line, a large-scale equipment is required for the sieving cycle of shot particles and there is a fear of remaining component of the shot particle on the surface of the product, so that it is difficult to completely prevent this problem.
Moreover, the thinning of the galvanized layer is known as another method of improving the workability of the galvanized layer, which has such a fundamental drawback that the sufficient corrosion resistance is not obtained.
SUMMARY OF THE INVENTION
It is, therefore, an object of the invention to develop a method effective for preventing the cracking of the galvanized layer at the worked position without causing the aforementioned problems in the light cold rolling or the blasting.
In order to achieve the above object or to prevent the degradation of the corrosion resistance of the worked portion in the galvanized steel sheet, it is necessary to prevent the occurrence of cracking in the galvanized layer at the worked position in the working of the galvanized steel sheet, whereby the corrosion resistance of the bending worked portion can be made 2 ~ 2 7 almos-t equal to that of the non-worked portion.
The inventors have made various studies with -respect to the production method of galvanized steel sheets not causing the cracking in the galvanized layer during the bending work. As a result, it has been found that when the surface of the galvanized layer in the galvanized steel sheet is subjected to a brushing treatment with a metal wire brush, the workability of the galvanized layer is considerably improved and the cracking in the galvanized layer due to the usual bending work can be prevented sufficiently.
Further, it has been found that even when the synthetic resin having excellent corrosion resistance is applied to the galvanized layer or the film of synthetic resin is laminated on the galvanized layer to form a painted-galvanized steel sheet having a so-called coating layer, there is no cracking in the galvanized layer on the base sheet and no propagation thereof and hence steel sheets having excellent corrosion resistance at the worked portion are obtained.
According to a first aspect of the invention, there is the provision of a method of producing galvanized steel sheets having a good worka~ility through preliminary treatment step for hot dip galvanizing, hot dip galvanizing treatment step and post treatment step for hot dip galvanizing, which comprises subjecting a surface of a galvanized layer to a brushing treatment with a metal wire . .
2Q~ 27 brush at said post treatment step.
According to a second aspect of the invention, there is the provision of a method of producing galvanized steel sheets having a good workability through preliminary treatment step for hot dip galvanizing, hot dip galvanizing treatment step, post treatment step for hot dip galvanizing and paint finishing treatment step with a synthetic resin on a surface of a galvanized layer, which comprises subjecting said surface of the galvanized layer to a brushing treatment with a metal wire brush at said post treatment step.
According to a third aspect of the invention, there is the provision of a method of producing galvanized steel sheets having a good workability through preliminary treatment step for hot dip galvanizing, hot dip galvanizing treatment step, post -treatment step for hot dip galvanizing and paint finishing treatment step with a synthetic resin on a surface of a galvanized layer, which comprises subjecting said surface of the galvanized layer to a brushing treatment with a metal wire brush at said paint finishing treatment step.
The hot dip galvanized steel sheet of the above struc-ture according to the invention is anyone of galvanized steel sheet, hot dip zinc-aluminum alloy coated steel sheet, and paint-galvanized steel sheet provided at the surface with a coating layer of synthetic resin.
According to the invention, a metal brush roll 2Q~?J~
obtained by providing metal or alloy wires of not less than 0.05 mm in diameter such as stainless steel wire, piano wire, brass wire or the like on a surface of roll drum is used as the metal wire brush.
The brushing treatment is preferably carried out by pushing the metal brush roll rotating at not less than 300 rpm onto the surface of the galvanized layer, whereby plastic deformation is given to the galvanized layer.
Moreover, the rotating speed is not limited to the above value because it is dependent upon the roll diameter.
In a preferred embodiment of the invention, the brushing treatment is carried out by arranging the metal brush roll at any position ranging from the solidification of hot dip galvanizing metal to the coiling thereof in the post treatment step for the galvanizing.
In the above construction of the invention, the metal brush roll is arranged between the cooling device and the skin pass rolling mill in the post treatment step for the galvanizing.
In another preferred embodiment of the invention, the brushing treatment is carried out by arranging the metal brush roll in the paint finishing treatment step.
In the above construction of the invention, the metal brush roll is arranged between the pay-off reel and the paint preliminary treating device in the paint finishing treatment step.
2 ~ ~ ~ ~ 2 r~
BRIEF DESCRIPTION OF THE DRAWING
Fig. 1 is a schematic view showing an outline of a continuous hot dip galvanizing installation; and Fig. 2 is a schematic view showing an outline of a continuous paint finishing line.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The invention is a method of brushing the surface of the galvanized layer. The reason why the occurrence of the cracking in the bend-worked portion of the galvanized layer is prevented by brushing the surface of the galvanized layer is considered as follows. That is, when the surface of the galvanized layer is subjected to the brushing treatment, mobile dislocations are introduced into the galvanized layer, whereby it is considered that the galvanized layer easily creates plastic deformation. According to the inventors' experience, the occurrence of cracks is disappeared by the brushing treatment of the galvanized layer even in the bending work.
According to the method of the invention, the workability of the galvanized layer is improved by subjecting the surface of the galvanized layer in the hot dip galvanized steel sheet, which is immersed in and passed through a hot dip galvanizing bath or a hot dip zinc-aluminum alloy coating bath, to a brushing treatment with a metal wire brush.
Such a brushing treatment is carried out at a 2 ~3! r l~ ' - r~
post treatment step after the galvanizing or at a subsequent paint finishing step. In the former case, the metal wire brush is arranged in any position ranging from the solidification of the hot dip galvanizing metal to the coiling thereof, while in the latter case, -the metal wire brush is arranged in any position at the pain finishing step.
The arranging position of the metal wire brush is between the cooling device and the skin pass roll or leveler roll at the post treatment step after the galvanizing. The reason on the limitation of such a position is due to the fact that the plastic deformation can not be given to the galvanizing metal before the solidification and the surface of the galvanized metal somewhat roughened by the brushing treatment can be tempered by skin pass treatment. The galvanized steel sheet subjected to the brushing treatment may be rendered into a product after chromate trea-tment.
Furthermore, when the painted-galvanized steel sheet is produced as another preferred embodiment, the coating layer is formed at the paint finishing step after the brushing of the galvanized layer at the post treatment step for the galvanizing, or the brushing treatment is conducted at the paint finishing step followed by the post treatment step. In this case, a synthetic resin such as polyester resin, epoxy resin, fluorocarbon resin, vinyl chloride resin or the like is applied onto the galvanized 2 ~ 2 7 layer, or a film of the above synthetic resin is laminated on the galvanized layer to form a coating layer, whereby a painted-galvanized steel sheet can be obtained.
In the above embodiment, the metal wire brush is arranged between a pay-off reel and a preliminary treatment device for paint at the paint finishing step, whereby the brushing treatment may be conducted. More preferably, the brushing treatment may be conducted between a looper roll at entrance side and a degreasing-washing device in the paint finishing line. The reason on the limitation of such a position is due to the fact that when the brushing treatment is conducted after the preliminary treatment for paint, the preliminarily treated film is broken, while when the metal wire brush is located at the back of the entrance-side looper roll, there is no influence of line rate to the treatability and also the impurity is easily removed by the degreasing and washing.
The generally known brushing treatment is conduc-ted in the washing line for the removal of contaminant from the surface of the steel sheet or the surface activation. Such a general brushing treatment is used for rubbing surface contaminant with, for example, a nylon brush, or for removing surface oxide and the like by polishing with a nylon brush containing grindstones.
However, these brushes used in the preliminary treatment for a so-called surface treatment do not develop the effect of causing plastic deformation on the galvanized _g_ 2 ~ 2 1 layer to improve the workability of the galvanized layer as in the invention.
In the invention, therefore, it is required to use the metal brush instead of the nylon brush. For example, hard metal or alloy wires such as stainless wire, piano wire, brass wire and the like may be used in the metal brush. In this case, when the diameter of the wire is too fine, the brushing effect is lost, so that the diameter of the wire constituting the brush body is not less than 0.05 mm, preferably 0.2-0.5 mm. Further, in order to conduct the brushing treatment with the metal wire brush in the production line, it is effective to stand metal wires having a length of about 50-150 mm onto a roll drum to form a metal brush roll. Moreover, when the rotating rate of the metal brush roll is too small, there is obtained no effect, so that the rotating rate is preferably not less than 300 rpm, more preferably 800-3000 rpm. In addition, it is preferable to rotate the metal brush roll under a light pushing force.
These conditions for the metal brush roll are important to give a proper plastic deformation to the surface of the galvanized layer. If the brushing treatment with the metal brush roll is carried out outside the above conditions, the effect of improving the desired workability of the galvanized layer is not obtained.
The following examples are given in the illustration of the invention but are not intended as limitations thereof.
In Fig. 1 is shown an outline of the continuous hot dip galvanizing line according to a first embodiment of the invention. A preliminary treatment step for galvanizing located at an upstream side of the continuous hot dip galvanizing line is a step that a steel sheet S
delivered from a pay-off reel 1 is transferred to an annealing furnace 5 through a welder 2, an entrance-side looper 3 and a degreasing and washing device 4 and heated in a reducing atmosphere. The thus surface-activated steel sheet is passed through a hot dip metal pot 6 in the galvanizing step to adhere a hot dip metal to the surface of the steel sheet and then passed through a wiping nozzle 7 to adjust the weight to be adhered. In the post treatment step for the galvanizing, the galvanized steel sheet is passed through an alloying furnace 8 or a minimized spangle forming device, if necessary, and then wound on a coiler 15 through a cooling device 9, a skin pass rolling mill 10, a leveler 11, a phosphating tank 12, a delivery-side looper 13 and a shearing machine 14.
In the illustrated embodiment, a metal brush roll 16 made from metal or metal alloy wires is arranged at an adequate position ranging from solidification of the hot dip galvanized metal to the delivery-side looper in the above post treatment step for the galvanizing in the continuous hot dip galvanizing line. In Fig. 1 is shown an arrangement of the metal brush roll between the cooling 2 Q ~
device 9 and the skin pass rolling mill 10.
In Fig. 2 is another embodiment of the invention, in which a continuous paint finishing step starting from a pay-off reel 21 is arranged at the back of the coiler 15 in the aforementioned post treating step for the galvanizing. In a first half of this paint finishing step, the steel sheet S delivered from the pay-off reel 21 is transferred to a preliminary treatment device for painting through a welder 22, an entrance-side looper 23 and a degreasing and washing device 24, at where the steel sheet is subjected to a treatment with a phosphate or chromate. Then, the thus surface-activated steel sheet is passed through an undercoating device 26, a baking device 27, a top coating device 28 and a baking device 29 to coat the surface of the sheet with a synthetic resin.
Thereafter, the paint finished steel sheet is passed through a post treatment device, if necessary, and wound about a coiler 33 through a delivery-side looper 31 and a shearing machine 32.
In the latter embodiment, a metal brush roll 34 made from metal or metal alloy wires may be arranged between the pay-off reel 21 and the degreasing and washing device 24, particularly immediately at the back of the entrance-side looper 23 in the continuous paint finishing treating step.
(1) Example 1: Metal brush rolls 10, 34 having a roll outer diameter of 300 mm and a roll width of 1000 mm and 2~4~27 provided with stainless steel wires (SUS 304) having a diameter of 0.3 mm were arranged at the back of the cooling device 9 in the post treatment step of the continuous hot dip galvanizing apparatus shown in Fig. 1 and at the back of the entrance-side looper 23 in the continuous paint finishing line shown in Fig. 2, respectively. These metal brush roll was rotated at 1500 rpm and pushed onto the surface of the galvanized layer to conduct brushing treatment. Moreover, the metal brush rolls arranged in the above lines could be escaped from these lines, so that the galvanizing was conducted without the brushing treatment for comparison.
Various hot dip galvanized steel sheets, and painted-galvanized steel sheets coated with polyester resin were manufactured by varying conditions such as thickness of steel sheet, composition of the galvanized layer, galvanizing amount, size of spangle and the like.
Then, the change of workability was examined in the presence or absence of the brushing treatment at the post treatment step or the paint finishing step. Moreover, the workability was judged by observing a bent portion after Ot bending by means of a loupe according to a judgement standard as shown in table 1.
In Table 2 are shown results evaluated on the workability in the galvanized steel sheets and paint finished steel sheets coated with the synthetic resin.
2 ~ ~ ~ i 2~
Table 1 _ _ Judgement ~tandard of workability _ __. _ 1 cracking is conspicuous, separation locally is observed 2 large cracking is observed over full surface 3 cracking is substantially observed over full surface 4 small cracking is locally observed no cracking is observed 2 ~ ~ ~ ~ 2 rl Table_2 Change of workability in galvanized steel sheets and paint finished galvanized steel sheets in the presence or absence of brushing treatment ~Kind of 1 _ - ¦ Worka- ¦ Workability¦
galvan- Thick- Amount Brushing bility of paint izing ness adhered Spangle treatment of gal- finished metal (mm) g/m2 sheet*1 *2 GI 0.22 120 regular presence 5 5 absence 3 3 0.35 120 minimum presence 5 5 5 absence 3 3 3 0.50 ¦250 minimum presence 5 4 5 absence 3 3 3 1.80 250 regular presence 4 4 absence 3 3 GF 0.35 180 regular presence 5 5 absence 4 4 0.40 250 regular ¦ presence 5 5 ¦ 5 absence 3 3 j 3 GL 0.27150 regular presence 3 4 absence 2 2 0.40150 regrlar presence 3 ~
absence 2 2 Note: The amount galvanizing metal adhered means an amount adhered to both surface of the sheets *1: Brushing treatment is carried out at the post treatment step for hot dip galvanizing *2: Brushing treatment is carried out at the paint finishing treatment step 205a~,2r~
As seen from the above results, the effect of the galvanized steel sheets according to the invention is remarkable; that is, the workability is considerably improved by the brushing treatment. Further, it is obvious that the similar results are always recognized even when the galvanizing is usual galvanizing (GI), hot dip Zn-5% Al alloy coating (Galfan; GF) or hot dip Zn-55%
Al alloy coating (Galvalume; GL), or even when the thickness, galvanizing amount or spangle shape is varied, or even when the synthetic resin is applied to or the film of the synthetic resin is laminated onto the surface of the galvanized layer.
As mentioned above, according to the invention, the workability of the galvanized layer in the galvanized steel sheets is improved, and particularly no cracklng is caused in the worked portion of the galvanized layer even when the galvanized layer is subjected to a bending work, so that galvanizecl steel sheets and painted-galvanized steel sheets having considerably improved corrosion resistance can be produced.
Claims (19)
1. A method of producing galvanized steel sheets having a good workability through preliminary treatment step for hot dip galvanizing, hot dip galvanizing treatment step and post treatment step for hot dip galvanizing, which comprises subjecting a surface of a galvanized layer to a brushing treatment with a metal wire brush at said post treatment step.
2. The method according to claim 1, wherein said galvanized layer is a hot dip zinc coating or hot dip zinc-aluminum alloy coating.
3. The method according to claim 1, wherein as said metal wire brush is used a metal brush roll obtained by providing metal or alloy wires of not less than 0.05 mm in diameter selected from stainless steel wire, piano wire and brass wire on a surface of roll drum.
4. The method according to claim 3, wherein said metal brush roll is pushed onto the surface of the galvanized layer while rotating at not less than 300 rpm to give plastic deformation to -the galvanized layer.
5. The method according to claim 3, wherein said metal brush roll is arranged at any position ranging from solidification of the hot dip galvanizing metal to coiling thereof at the post treatment step for the galvanizing.
6. The method according to claim 3, wherein said metal brush roll is arranged between a cooling device and a skin pass rolling mill at the post treatment step for the galvanizing.
7. A method of producing galvanized steel sheets having a good workability through preliminary treatment step for hot dip galvanizing, hot dip galvanizing treatment step, post treatment step for hot dip galvanizing and paint finishing treatment step with a synthetic resin on a surface of a galvanized layer, which comprises subjecting said surface of the galvanized layer to a brushing treatment with a metal wire brush at said post treatment step.
8. The method according to claim 7, wherein said coating layer is formed by applying a synthetic resin or by laminating a film of a synthetic resin.
9. The method according to claim 7, wherein said galvanized layer is a hot dip zinc coating or hot dip zinc-aluminum alloy coating.
10. The method according to claim 7, wherein as said metal wire brush is used a metal brush roll obtained by providing metal or alloy wires of not less than 0.05 mm in diameter selected from stainless steel wire, piano wire and brass wire on a surface of roll drum.
11. The method according to claim 10, wherein said metal brush roll is pushed onto the surface of the galvanized layer while rotating at not less than 300 rpm to give plastic deformation to the galvanized layer.
12. The method according to claim 10, wherein said metal brush roll is arranged at any position ranging from solidification of the hot dip galvanizing metal to coiling thereof at the post treatment step for the galvanizing.
13. The method according to claim 10, wherein said metal brush roll is arranged between a cooling device and a skin pass rolling mill at the post treatment step for the galvanizing.
14. A method of producing galvanized steel sheets having a good workability through preliminary treatment step for hot dip galvanizing, hot dip galvanizing treatment step, post treatment step for hot dip galvanizing and paint finishing treatment step with a synthetic resin on a surface of a galvanized layer, which comprises subjecting said surface of the galvanized layer to a brushing treatment with a metal wire brush at said paint finishing treatment step.
15. The method according to claim 14, wherein said coating layer is formed by applying a synthetic resin or by laminating a film of a synthetic resin.
16. The method according to claim 14, wherein said galvanized layer is a hot dip zinc coating or hot dip zinc-aluminum alloy coating.
17. The method according to claim 14, wherein as said metal wire brush is used a metal brush roll obtained by providing metal or alloy wires of not less than 0.05 mm in diameter selected from stainless steel wire, piano wire and brass wire on a surface of roll drum.
18. The method according to claim 17, wherein said metal brush roll is pushed onto the surface of the galvanized layer while rotating at not less than 300 rpm to give plastic deformation to the galvanized layer.
19. The method according to claim 17, wherein said metal brush roll is arranged between an entrance-side pay-off reel and a preliminary treating device for painting at the paint finishing treatment step.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP292,059/90 | 1990-10-31 | ||
| JP2292059A JPH04168258A (en) | 1990-10-31 | 1990-10-31 | Production of galvanized steel sheet excellent in workability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2054527A1 true CA2054527A1 (en) | 1992-05-01 |
Family
ID=17777011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002054527A Abandoned CA2054527A1 (en) | 1990-10-31 | 1991-10-30 | Method of producing galvanized steel sheets having a good workability |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0483810A3 (en) |
| JP (1) | JPH04168258A (en) |
| KR (1) | KR920008207A (en) |
| AU (1) | AU8685791A (en) |
| CA (1) | CA2054527A1 (en) |
| DE (1) | DE483810T1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2391476C (en) * | 2002-03-25 | 2007-08-07 | Bethlehem Steel Corporation | A coating composition for steel product, a coated steel product, and a steel product coating method |
| AU2003901424A0 (en) | 2003-03-20 | 2003-04-10 | Bhp Steel Limited | A method of controlling surface defects in metal-coated strip |
| US20070259203A1 (en) * | 2003-11-26 | 2007-11-08 | Bluescope Steel Limited | Coated Steel Strip |
| KR100706975B1 (en) * | 2005-12-15 | 2007-04-13 | 고려제강 주식회사 | Painted air spinning wire and the manufacturing method of the same |
| US7699686B2 (en) | 2006-11-03 | 2010-04-20 | Severstal Sparrows Point, Llc | Method for polishing and aluminum-zinc hot-dip coating |
| CN104846274B (en) * | 2015-02-16 | 2017-07-28 | 重庆哈工易成形钢铁科技有限公司 | Hot press-formed use steel plate, hot press-formed technique and hot press-formed component |
| KR102181786B1 (en) * | 2018-12-13 | 2020-11-24 | 주식회사 포스코 | Galvanizing plant |
| CN110252630A (en) * | 2019-07-16 | 2019-09-20 | 山东圣士达环保科技有限公司 | A kind of thin plate hot galvanizing toner paint line and its production technology |
| KR102344677B1 (en) * | 2020-05-15 | 2021-12-29 | 주식회사 조은텍 | Etching Apparatus For Laser Block Of Ring Laser Gyroscope |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR470561A (en) * | 1914-04-06 | 1914-09-17 | Tomas Roses Ibbotson | Machine for galvanizing parts of wire mesh |
| US4291074A (en) * | 1978-11-09 | 1981-09-22 | Laminoirs De Strasbourg | Process for producing a sheet or strip which is lightly galvanized on one or both sides and products obtained by said process |
| JPS58221267A (en) * | 1982-06-18 | 1983-12-22 | Sumitomo Metal Ind Ltd | Method for preventing dent mark of galvanized steel sheet |
| JPS63118057A (en) * | 1986-11-05 | 1988-05-23 | Nisshin Steel Co Ltd | Production of hot dip aluminized steel sheet |
-
1990
- 1990-10-31 JP JP2292059A patent/JPH04168258A/en active Pending
-
1991
- 1991-10-29 AU AU86857/91A patent/AU8685791A/en not_active Abandoned
- 1991-10-30 EP EP19910118539 patent/EP0483810A3/en not_active Withdrawn
- 1991-10-30 DE DE199191118539T patent/DE483810T1/en active Pending
- 1991-10-30 CA CA002054527A patent/CA2054527A1/en not_active Abandoned
- 1991-10-30 KR KR1019910019190A patent/KR920008207A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0483810A2 (en) | 1992-05-06 |
| JPH04168258A (en) | 1992-06-16 |
| DE483810T1 (en) | 1992-11-05 |
| AU8685791A (en) | 1992-05-07 |
| KR920008207A (en) | 1992-05-27 |
| EP0483810A3 (en) | 1993-03-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2054527A1 (en) | Method of producing galvanized steel sheets having a good workability | |
| KR20150073315A (en) | HOT DIP Zn-Al-Mg ALLOY PLATED STEEL SHEET HAVING EXCELLENT CORROSION RESISTANCE AND METHOD FOR MANUFACTURING THE SAME | |
| CA2403217C (en) | Plated metal wire and production method and production device therefor | |
| US3927816A (en) | Hot dipped steel tube and a method for producing the same | |
| JP2922926B2 (en) | Manufacturing method of alloyed galvanized steel strip | |
| JP3148542B2 (en) | Hot-dip galvanized steel sheet with excellent glare resistance | |
| CA1304543C (en) | Method for galvanizing perforated steel sheet | |
| US3148081A (en) | Galvanized flat rolled product and its manufacture | |
| JP2997971B2 (en) | Method and apparatus for producing hot-rolled hot-dip galvanized steel strip with excellent plating adhesion | |
| JP2002060917A (en) | Method for producing galvanized steel sheet | |
| JPH0215154A (en) | Production of hot dip galvanized steel strip excellent in scratch resistance | |
| KR100985370B1 (en) | Continuous Hot-dip Coating Line of Hot Rolled Steel Strip and Method for Continuous Hot-dip Coating Hot Rolled Steel Strip | |
| JP3943587B1 (en) | Method for producing corrosion-resistant PC steel stranded wire | |
| JPH0551720A (en) | Method and equipment for producing surface-treated steel sheet excellent in workability | |
| US20230323520A1 (en) | Slurry-blasted hot-roll-based hot dip aluminized steel strip | |
| JPH0671604B2 (en) | Method for producing stainless cold-rolled steel strip | |
| JPH10130801A (en) | Production of hot-dip plated steel sheet excellent in surface quality | |
| JP3248431B2 (en) | Manufacturing method of hot-dip coated steel sheet | |
| JPH04322766A (en) | Equipment for continuously producing coated steel sheet | |
| RU2149717C1 (en) | Method of producing zinc-plated strip steel for subsequent application of high-quality paint coatings | |
| JPH02225652A (en) | Manufacture of high image clarity steel sheet | |
| JP3603512B2 (en) | Al-containing hot-dip galvanized steel sheet and method for producing the same | |
| JP2800644B2 (en) | Touch roll for hot-dip galvanized steel strip | |
| JPH0971850A (en) | Production of hot dip coated steel sheet having excellent surface quality | |
| JP2005152935A (en) | Method for manufacturing hot dip galvanized steel strip, temper rolling apparatus and continuous hot dipping facility |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |