WO2005056863A1 - 溶融亜鉛めっき鋼板及びその製造方法 - Google Patents
溶融亜鉛めっき鋼板及びその製造方法 Download PDFInfo
- Publication number
- WO2005056863A1 WO2005056863A1 PCT/JP2004/018495 JP2004018495W WO2005056863A1 WO 2005056863 A1 WO2005056863 A1 WO 2005056863A1 JP 2004018495 W JP2004018495 W JP 2004018495W WO 2005056863 A1 WO2005056863 A1 WO 2005056863A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- plating
- steel sheet
- bath
- concentration
- hot
- Prior art date
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 62
- 239000010959 steel Substances 0.000 title claims abstract description 62
- 239000011701 zinc Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 26
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 8
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 8
- 238000007747 plating Methods 0.000 claims abstract description 149
- 238000004519 manufacturing process Methods 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 31
- 238000001816 cooling Methods 0.000 claims description 57
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 41
- 239000008397 galvanized steel Substances 0.000 claims description 41
- 239000011248 coating agent Substances 0.000 claims description 19
- 238000000576 coating method Methods 0.000 claims description 19
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 229910001297 Zn alloy Inorganic materials 0.000 claims 1
- 239000000203 mixture Substances 0.000 abstract description 7
- 238000007598 dipping method Methods 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 abstract 3
- 230000015271 coagulation Effects 0.000 abstract 2
- 238000005345 coagulation Methods 0.000 abstract 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 19
- 238000005275 alloying Methods 0.000 description 14
- 238000012360 testing method Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 239000003595 mist Substances 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 9
- 239000010410 layer Substances 0.000 description 7
- 238000005096 rolling process Methods 0.000 description 7
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 239000013078 crystal Substances 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 229910052787 antimony Inorganic materials 0.000 description 5
- 229910052793 cadmium Inorganic materials 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 229910052745 lead Inorganic materials 0.000 description 5
- 229910052718 tin Inorganic materials 0.000 description 5
- 230000002411 adverse Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 230000008595 infiltration Effects 0.000 description 4
- 238000001764 infiltration Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 230000009257 reactivity Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000010953 base metal Substances 0.000 description 2
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 2
- 238000004453 electron probe microanalysis Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 238000007665 sagging Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000004611 spectroscopical analysis Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- QZPSXPBJTPJTSZ-UHFFFAOYSA-N aqua regia Chemical compound Cl.O[N+]([O-])=O QZPSXPBJTPJTSZ-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000002245 particle 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
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000003887 surface segregation Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 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
- C23C2/34—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
-
- 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
-
- 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
- C23C2/261—After-treatment in a gas atmosphere, e.g. inert or reducing atmosphere
Definitions
- the present invention relates to a hot-dip galvanized steel sheet suitable as a material for home appliances, building materials, automobiles, and the like, and a method for producing the same.
- % representing chemical composition means “% by mass”
- ppm means “ppm by mass”
- A1 Is melted by dipping in a plating bath containing at least 0.13%, and then, after adjusting the amount of coating, it is cooled without heating and is then hot-dip galvanized steel sheet (hereinafter simply referred to as “GI steel sheet”). ), And dipping in a low A1 plating bath containing about 0.13% or less of A1 to adjust the amount of coating, and then heating the steel sheet so that the Fe in the plating film is 8-12%. Alloyed hot-dip galvanized steel sheet (hereinafter simply referred to as "GA steel sheet”) for alloying the plating film.
- the sharpness after coating is regarded as important, and therefore, it is desired that the plating film has a smooth surface.
- the surface shape of the plating film is mainly controlled by the temper rolling technology, but it is preferable that the unevenness after the plating finish is suppressed as much as possible.
- the spangle of the plating is large, the dent at the grain boundary becomes large due to this.
- the workability of the GI steel sheet largely depends on the orientation of the plating film.
- the more perpendicular the Zn (002) plane of the plating film is to the plate surface the more deformable it is against tensile deformation.
- the crack generation rate of a small film There is a tendency for the crack generation rate of a small film to increase.
- the blackening resistance and workability of the plating surface are contradictory in terms of the relationship with the orientation of the Zn (002) plane, and the two have a trade-off relationship.
- the spangle is increased by adjusting the cooling so as to reduce the orientation ratio of the Zn (002) plane with emphasis on the strength of the steel, the blackening resistance of the steel sheet surface will be degraded.
- Patent Document 1 As a method of changing the orientation of plating, a method of forcibly deforming a film by temper rolling (Patent Document 1) and a method of grinding a plating surface (Patent Document 2) have been proposed. You.
- Patent Document 3 discloses that A1 is in a range of more than 0.3% to less than 3.5%, and Si is in a range of 1/30 to 1/1 of A1. There is disclosed a technique of plating with a plating bath containing a plating bath.
- Patent Document 4 discloses an example of a hot-dip galvanized steel sheet in which the plating layer contains Si, in addition to A1 and Mg, to improve corrosion resistance and surface appearance.
- Patent Document 1 JP-A-10-226863
- Patent Document 2 JP-A-6-256924
- Patent Document 3 JP-A-60-52569
- Patent Document 4 JP-A-2002-220650
- Non-Patent Document 1 Iron and Steel Handbook IV, P426 (May 31, 1982)
- Non-Patent Document 2 Iron and Steel, vol. 72, No. 13, S1306 (issued in 1986)
- Patent Document 1 there is a possibility that mechanical characteristics may be degraded. There is a concern that it will be necessary to increase the cost and lead to an increase in the cost, and a decrease in the operational aspect such as the reattachment of the grinding powder.
- Patent Document 3 when it is necessary to use a high A1 bath in which A1 in the bath is more than 0.3%, there is the following problem.
- the usual continuous fusion plating line is often used for both GI steel sheets and GA steel sheets. Short time heating during production of GA steel sheet
- the Al concentration in the bath is set to about 0.1% so that the alloying is completed by the above procedure. To reduce A1 from a high A1 bath of more than 0.3% to around 0.1%, it was necessary to pass a large amount of dummy steel sheets, and there was a problem in productivity.
- Patent Document 4 since a large amount of Mg is contained, the blackening resistance is reduced as described above, and the plating film is hardened and workability is poor. In addition, there is a problem that components are not normally contained in GA, and component adjustment is required in a dual-purpose line.
- the present invention provides a hot-dip galvanized steel sheet having a low A1 bath composition, good appearance, blackening resistance, and excellent workability in consideration of combined use with GA steel sheet production, and its production.
- the task is to provide a method.
- the present invention has been completed based on these findings, and the gist is as follows.
- the invention described in claim 1 is a plating step in which a steel sheet is immersed in a melting plating bath and pulled up to attach a plating film to the surface of the steel sheet, and the amount of the plating film to be applied is adjusted following the plating step.
- a method for manufacturing a hot-dip galvanized steel sheet comprising: a coating amount adjusting step to be performed, and a film solidifying step of solidifying a plating film after the coating amount adjusting step, wherein the A1 concentration and the Si concentration in the plating bath are respectively 0.13-0.
- An object of the present invention is to solve the above-mentioned problem by a method of manufacturing a zinc-plated steel sheet.
- the A1 concentration in the plating bath is 0.3% or less, it is possible to use both the GI steel sheet manufacturing apparatus and the GA steel sheet manufacturing apparatus. It is possible to provide a method for producing a hot-dip galvanized steel sheet that is possible.
- the plating bath contains an appropriate amount of Si, it is possible to achieve a minimum spangle appearance even if the plating is solidified by cooling or air cooling after adjusting the coating weight. We can provide manufacturing methods.
- the bath temperature and the temperature of the material entering the plating bath have been optimized, excessive growth of the Fe-Zn-based alloy layer at the (plated base material) interface can be suppressed, and workability can be improved. It is possible to provide a method for producing a hot-dip galvanized steel sheet.
- the invention set forth in claim 2 is the method for producing a hot-dip galvanized steel sheet according to claim 1, wherein the coating solidification step includes cooling and / or air-cooling the plated coating. It is a step of solidifying. [0018] According to the invention set forth in claim 2, rapid cooling as in the case of mist spraying can be avoided, so that the minimum spandanol appearance can be achieved in the method for producing a hot-dip galvanized steel sheet. can do. Further, the degree of orientation of the Zn (002) plane can be reduced as compared with the case where mitspray is used.
- the invention according to claim 3 is the method for producing a hot-dip galvanized steel sheet according to claim 1, wherein the Mg concentration in the plating bath is less than 100 ppm, Pb + Sn + Cd + The total concentration of Sb is 200 ppm or less.
- the Mg concentration and the total concentration of Pb, Sb, Sn, and Cd are suppressed, and the Zn (002) plane It can suppress segregation on surfaces other than the above, and can improve blackening resistance.
- the A1 concentration and the Si concentration in the plating film are 0.15-0.6% and 5-150 ppm, respectively, and the Fe content force is 0.6 g / m2.
- the following is intended to solve the above problem by using a hot-dip galvanized steel sheet.
- the invention set forth in claim 5 provides the steel sheet according to claim 4 with an orientation index force of the Zn (002) plane of the plating film of ⁇ 3.0-4. .5.
- the invention described in claim 6 is the steel sheet according to claim 4, wherein the Mg concentration in the plating film is less than 100 ppm, and the total concentration of Pb + Sn + Cd + Sb. Is not more than 200 ppm by mass.
- the present invention it is possible to obtain a hot-dip galvanized steel sheet having both good appearance, blackening resistance and excellent workability, and a method for producing the same. Therefore, it becomes possible to obtain a hot-dip galvanized steel sheet which is extremely suitable not only as an interior material but also as an exterior material as a corrosion-resistant material for home appliances, building applications, automobiles and the like.
- the apparatus for producing a hot-dip galvanized steel sheet according to the present invention can also be used as a production apparatus for GA.
- a steel plate is immersed in a hot-dip bath and pulled up to attach a plating film to the surface of the steel plate.
- An object of the present invention is to provide a method for producing a hot-dip galvanized steel sheet, which includes a coating amount adjusting step of adjusting a coating amount and a coating solidifying step of solidifying a plating film after the coating amount adjusting step.
- the A1 concentration in the bath be 0.13-0.3%. If the A1 concentration in the bath is too low, the FeZn-based interfacial alloy layer formed during immersion tends to be formed excessively even if the infiltration material temperature and the bath temperature are adjusted to an appropriate range, and this leads to poor workability. Adversely affect. Therefore, it is necessary to set the A1 concentration in the bath to at least 0.13% or more. More preferably, it is 0.15% or more.
- the upper limit of the A1 concentration in the bath is limited to 0.3% or less in consideration of switching to the production of GA steel sheets as described above. More preferably, it is 0.25% or less.
- the A1 concentration and the Si concentration in the plating film are 0.15 to 0.6% and 5 to 150 ppm, respectively, and the Fe content is 0.6 g / m 2 or less. It is intended to provide a hot-dip galvanized steel sheet.
- the A1 concentration in the plating film of the hot-dip galvanized steel sheet be 0.15-0.6%.
- the upper and lower limits of the A1 concentration in the coating are mainly limited by the A1 amount in the bath described above.
- the lower limit of the A1 concentration in the film is 0.15% or more, preferably 0.2% or more, though it depends on the amount of plating.
- the upper limit of the A1 concentration in the film is 0.6% or less, preferably 0.5% or less.
- the A1 concentration in the coating is generally higher than the A1 concentration in the plating bath. Become.
- plating film Fe content of molten zinc plated steel sheet it is essential that it is 0. 6gZm 2 below.
- the Fe-Zn-based interfacial alloy layer tends to be excessively formed at the plating-base metal interface. Adversely affects workability.
- the Fe content in the film should be 0.6 g / m 2 or less. More preferably, it is 0.4 g / m 2 or less.
- the Si concentration in the bath and the Si concentration in the plating film of the hot-dip galvanized steel sheet be 5 to 150 ppm.
- the Si concentration in the bath is less than 5 ppm, it is difficult to achieve an average particle diameter of lmm or less as described below, which has a small effect of suppressing the spangle diameter.
- lOppm or more more preferably Or more than 20 ppm. Since Si is said to have high reactivity with the base material Fe, it is concentrated in the plating-base material interface alloy layer, and in some cases, does not adversely affect the alloying speed during GA production. It is thought.
- the upper limit of the Si concentration in the bath should be set to 150 ppm or less because the solubility in the molten plating bath is about 200 ppm, and when the Si concentration exceeds 150 ppm, the effect of suppressing the spangle diameter is saturated. It is good.
- the more preferable range of the Si concentration in the bath is less than 100 ppm, and the more preferable range is less than 50 ppm.
- the Mg concentration in the bath and the Mg concentration in the plating film of the hot-dip galvanized steel sheet are preferably less than 100 ppm.
- the total concentration of the bath (Pb + Sn + Cd + Sb) and the plating film of the hot-dip galvanized steel sheet (Pb + Sn + Cd +) It is desirable that the total concentration of Sb) be 200 ppm or less. All elements of Pb, Sn, Cd, and Sb are segregated and screened elements without mist cooling, and the segregation causes local corrosion to progress, thereby deteriorating blackening resistance. Therefore, the total concentration of these elements is preferably set to 20 ppm or less. A more preferred total concentration range is 150 ppm or less. Other unavoidable impurities have no problem even if they are contained in small amounts such as Ni, Cr, Ti, Mo, and W.
- the spangle of the plating film preferably has an average crystal grain size of 1 mm or less. Spangles of hot-dip galvanized steel sheet may reduce the appearance after painting.
- the limit of the size of the spangle is a force depending on the required performance level.
- the average crystal grain size of the plating film spanning hole is preferably 1 mm or less. More preferably, it is 0.8 mm or less.
- the “average crystal grain size” of the spangrenole is determined by calculating the average value of the major axis and the minor axis of any 20 spangrenoles under a microscope.
- the orientation index of the Zn (002) plane of the plating film in the hot-dip galvanized steel sheet of the present invention is preferably 3.0 to 4.5.
- the ⁇ orientation index of Zn (002) plane '' shall be measured under the conditions of an acceleration voltage of 30 kv and a current of 100 mA using a Co tube, and the value calculated by the following equation shall be used. I do.
- IF (002) I (002) / ⁇ I (002) +1 (100) +1 (101) +1 (102) +1 (103) +1 (1
- the plating film is unlikely to cause twinning deformation during bending deformation, and promotes cracking of the film.
- the orientation index of the Zn (002) plane is 4.5 or less, more preferably, 4.0 or less.
- the lower the orientation index of the Zn (002) plane the lower the performance. Therefore, it is preferably 3.0 or more, more preferably 3.5 or more.
- the bath temperature of the plating bath is 450 to 480 ° C, and the intruding material temperature at which the steel sheet enters the plating bath is within ⁇ 20 ° C of the bath temperature. It is essential that there be.
- the bath temperature of the plating bath should be 450 ° C or higher. Further, when the bath temperature of the plating bath exceeds 480 ° C, the reactivity of the plating bath is increased when the steel sheet dipped, it becomes difficult to control the film in Fe content in 0. 6gZm 2 or less, 480 ° C or less Limited to. A more preferred range is 455-475 ° C. On the other hand, if the material temperature at which the steel sheet enters the plating bath is higher than the bath temperature + 20 ° C, this also promotes the plating and the reactivity of the steel plate.
- the intruding material temperature at which the steel sheet enters the plating bath should not be lower than the bath temperature by 20 ° C.
- the cooling method in the film cooling step of solidifying the plating film is preferably natural cooling and Z or air cooling.
- the cooling rate from the plating bath temperature to the solidification temperature of the plating is about 0.5 to 15 ° C / sec.
- the method for producing a hot-dip galvanized steel sheet according to the present invention in addition to the above-described conditions, the method may be basically performed according to the method for producing a GI steel sheet. A preferred production method is described below.
- the base material a steel sheet adjusted to a predetermined temperature after recrystallization annealing in a continuous heating furnace, for example, can be used.
- the base material is immersed in a plating bath, pulled up, and the amount of plating applied is adjusted by a known method such as a gas squeezing method. If the base material does not require recrystallization annealing, heat the base material in a reducing atmosphere of at least 600 ° C, cool it to near the plating bath temperature, and then immerse it in the plating bath.
- the base material immersed in the plating bath is pulled up from the plating bath to adjust the amount of adhesion.
- the adjustment of the amount of adhesion may be performed by a general gas wiping method or the like.
- wiping is performed with a non-oxidizing gas after plating.
- the gas type can be N, Ar, He, etc.
- the coating amount of the plating film on the hot-dip galvanized steel sheet of the present invention is not particularly limited, but is preferably in the range of 40 to 150 gZm 2 per one side in order to secure appropriate operation efficiency. .
- the steel sheet after plating is usually subjected to skin pass rolling for the purpose of adjusting the surface properties and mechanical properties.
- the orientation of the plating film also changes due to skin pass rolling, the force S that can affect the calorie property, and depending on the skin pass conditions, the mechanical properties of steel are adversely affected.
- good workability can be obtained even when subjected to skin pass rolling under general conditions (e.g., elongation of about 0.8% with a work roll subjected to darka kneading) by cooling or air cooling after plating. Secured.
- the product surface after plating is subjected to post-treatment such as untreated / paper-proof, untreated Z-proof oil, and known chromic acid treatment, phosphate treatment, and resin film application. You may.
- a 0.8 mm-thick cold-rolled steel sheet having the chemical composition shown in Table 1 was annealed in a reducing atmosphere using a continuous hot-dip galvanizing apparatus to obtain a base material.
- the bath temperature of the plating bath and the material temperature of the base material that entered the plating bath were also changed. Table 2 summarizes these plating conditions. The amount of plating was controlled by wiping with nitrogen gas.
- the plated steel sheet thus obtained was subjected to skin pass rolling (elongation of about 0.8% with dulled work rolls).
- the properties of the plating film of the resulting plated steel sheet were investigated by the following methods.
- the measured value of the content shows almost the same value as the analytical value of the content in the bath.
- another method of measuring Si in the plating bath and the plating film is as follows. There are the following methods. First, the solidified plating bath or plating film is dissolved with 15% NaOH, and then this solution is mixed with 1: 1 aqua regia and 4% hydrogen peroxide added to the mixture and heated to about 60 ° C. I do. The solution thus obtained is analyzed by ICP spectroscopy.
- (B) Average crystal grain size of spangle The average value of the major axis and minor axis of 20 arbitrary spangles was defined as the average crystal grain size.
- the average crystal grain size of the spangle which became unclear by temper rolling was measured by immersing the sample in a 20% HC1 aqueous solution at room temperature for 5 seconds to etch the sample.
- Trial Nos. 1 to 7 investigate the effect of A1 concentration in the bath.
- No. 1 is an example where the A1 concentration in the bath was too low. Not only A1 in the plating film of the obtained GI steel sheet was low, but the Fe content was high and workability was degraded. In contrast, the A1 concentration in the bath exceeded 0.15% (No. From 3), workability was particularly good.
- No. 7 is an example where the A1 concentration in the bath was too high. In addition to high A1 in the plating film, the alloying processability was poor.
- Trial No. 8-15 examined the effect of Si concentration in the bath.
- No. 8 is an example containing no Si, and the spangle diameter became lmm or more.
- No. 15 is an example in which the Si concentration is high, and although the A1 concentration in the bath is not necessarily high, the alloying processability was poor.
- Test No. 16-22 is an example in which Pb, Cd, Sn, and Sb are contained. It was recognized that the black discoloration resistance was deteriorated by containing these. In particular, when the total concentration exceeded 200 ppm, as in Nos. 19 and 22, the degree of deterioration was large.
- Test number Nos. 23-26 were obtained by investigating the effect of Mg. When the Mg concentration exceeded 100 ppm as in No. 26, AL * exceeded 5, and blackening resistance was a practical problem. It became the level which becomes.
- Trial No. 27-30 investigated the effect of plating bath temperature.
- the intruder temperature was adjusted to the bath temperature.
- the plating bath temperature was too low (No. 27)
- the plating sagging became remarkable.
- the plating bath temperature was too high (No. 30)
- the Fe% in the plating film was high, and the workability was slightly poor.
- Trial No. 31-34 was obtained by investigating the effect of the invading material temperature while keeping the plating bath temperature constant. If the intruding material temperature was too high (No. 34) or too low (No. 31), the Fe% in the plating film was high, and the workability was slightly inferior.
- Test No. 35-38 is a modification of the cooling method.
- the zinc plating baths corresponding to these trial numbers contained an appropriate amount of Si, so that the spangle diameter remained almost unchanged even when the cooling method was changed.
- the example using mist spray (No. 36-38) was inferior in workability. This is probably because the orientation index of the Zn (002) plane was increased.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005516195A JP4506672B2 (ja) | 2003-12-12 | 2004-12-10 | 溶融亜鉛めっき鋼板及びその製造方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003414939 | 2003-12-12 | ||
JP2003-414939 | 2003-12-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005056863A1 true WO2005056863A1 (ja) | 2005-06-23 |
Family
ID=34675109
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/018495 WO2005056863A1 (ja) | 2003-12-12 | 2004-12-10 | 溶融亜鉛めっき鋼板及びその製造方法 |
Country Status (2)
Country | Link |
---|---|
JP (1) | JP4506672B2 (ja) |
WO (1) | WO2005056863A1 (ja) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008504440A (ja) * | 2004-06-29 | 2008-02-14 | コラス・スタール・ベー・ブイ | 溶融亜鉛合金めっき鋼板およびその製造方法 |
JP2009084587A (ja) * | 2007-09-27 | 2009-04-23 | Jfe Steel Kk | 表面処理鋼板 |
CN101812654A (zh) * | 2010-05-18 | 2010-08-25 | 梁士臣 | 在生产中气刀气源为空气的热浸镀锌铝镁稀土镀层钢带 |
WO2011001662A1 (ja) * | 2009-06-30 | 2011-01-06 | 新日本製鐵株式会社 | Zn-Al-Mg系溶融めっき鋼板とその製造方法 |
JP2012503102A (ja) * | 2008-09-23 | 2012-02-02 | ポステック アカデミー−インダストリー ファンデーション | 基地としてマルテンサイト組織を有する超高強度溶融亜鉛めっき鋼板およびその製造方法 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5767153A (en) * | 1980-10-09 | 1982-04-23 | Nippon Steel Corp | Production of zinc alloy hot dipped steel plate of high resistance to exfoliation of plating with time |
JPH09209109A (ja) * | 1996-02-08 | 1997-08-12 | Sumitomo Metal Ind Ltd | 微小スパングル溶融Zn−Al系合金めっき鋼板とその製法 |
JP2001247951A (ja) * | 1999-12-28 | 2001-09-14 | Kawasaki Steel Corp | めっき密着性および溶接性に優れた溶融亜鉛めっき鋼板並びにその製造方法 |
JP2002194518A (ja) * | 2000-12-26 | 2002-07-10 | Sumitomo Metal Ind Ltd | 溶接性に優れた溶融亜鉛めっき鋼板およびその製造方法 |
JP2002371342A (ja) * | 2001-06-14 | 2002-12-26 | Sumitomo Metal Ind Ltd | 溶融亜鉛めっき鋼板およびその製造方法 |
JP2003183800A (ja) * | 2001-12-19 | 2003-07-03 | Kawatetsu Galvanizing Co Ltd | 耐黒変性および耐食性に優れた溶融亜鉛系めっき鋼板およびその製造方法 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02267281A (ja) * | 1989-04-07 | 1990-11-01 | Sumitomo Metal Ind Ltd | 耐白錆性および耐黒変性に優れた溶融亜鉛めっき鋼板とその製造方法 |
-
2004
- 2004-12-10 WO PCT/JP2004/018495 patent/WO2005056863A1/ja active Application Filing
- 2004-12-10 JP JP2005516195A patent/JP4506672B2/ja active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5767153A (en) * | 1980-10-09 | 1982-04-23 | Nippon Steel Corp | Production of zinc alloy hot dipped steel plate of high resistance to exfoliation of plating with time |
JPH09209109A (ja) * | 1996-02-08 | 1997-08-12 | Sumitomo Metal Ind Ltd | 微小スパングル溶融Zn−Al系合金めっき鋼板とその製法 |
JP2001247951A (ja) * | 1999-12-28 | 2001-09-14 | Kawasaki Steel Corp | めっき密着性および溶接性に優れた溶融亜鉛めっき鋼板並びにその製造方法 |
JP2002194518A (ja) * | 2000-12-26 | 2002-07-10 | Sumitomo Metal Ind Ltd | 溶接性に優れた溶融亜鉛めっき鋼板およびその製造方法 |
JP2002371342A (ja) * | 2001-06-14 | 2002-12-26 | Sumitomo Metal Ind Ltd | 溶融亜鉛めっき鋼板およびその製造方法 |
JP2003183800A (ja) * | 2001-12-19 | 2003-07-03 | Kawatetsu Galvanizing Co Ltd | 耐黒変性および耐食性に優れた溶融亜鉛系めっき鋼板およびその製造方法 |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008504440A (ja) * | 2004-06-29 | 2008-02-14 | コラス・スタール・ベー・ブイ | 溶融亜鉛合金めっき鋼板およびその製造方法 |
JP2009084587A (ja) * | 2007-09-27 | 2009-04-23 | Jfe Steel Kk | 表面処理鋼板 |
JP2012503102A (ja) * | 2008-09-23 | 2012-02-02 | ポステック アカデミー−インダストリー ファンデーション | 基地としてマルテンサイト組織を有する超高強度溶融亜鉛めっき鋼板およびその製造方法 |
US8741078B2 (en) | 2008-09-23 | 2014-06-03 | Postech Academy-Industry Foundation | Method for manufacturing an ultrahigh strength hot dip galvanized steel sheet having martensitic structure as matrix |
WO2011001662A1 (ja) * | 2009-06-30 | 2011-01-06 | 新日本製鐵株式会社 | Zn-Al-Mg系溶融めっき鋼板とその製造方法 |
JP5043234B2 (ja) * | 2009-06-30 | 2012-10-10 | 新日本製鐵株式会社 | Zn−Al−Mg系溶融めっき鋼板とその製造方法 |
TWI406967B (zh) * | 2009-06-30 | 2013-09-01 | Nippon Steel & Sumitomo Metal Corp | Zn-Al-Mg系熔融鍍敷鋼板與其製造方法 |
AU2010267413B2 (en) * | 2009-06-30 | 2015-05-21 | Nippon Steel Corporation | Zn-Al-Mg coated steel sheet and producing method thereof |
CN101812654A (zh) * | 2010-05-18 | 2010-08-25 | 梁士臣 | 在生产中气刀气源为空气的热浸镀锌铝镁稀土镀层钢带 |
Also Published As
Publication number | Publication date |
---|---|
JP4506672B2 (ja) | 2010-07-21 |
JPWO2005056863A1 (ja) | 2007-07-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2695963B1 (en) | Hot stamp-molded high-strength component having excellent corrosion resistance after coating | |
EP2798094B1 (en) | High-strength hot-dip galvanized steel sheet having excellent plating surface quality and adhesion, and method of manufacturing the same | |
WO2020213686A1 (ja) | めっき鋼板 | |
JP5825244B2 (ja) | 溶融亜鉛めっき鋼板 | |
KR101719947B1 (ko) | 고강도 합금화 용융 아연 도금 강판의 제조 방법 | |
EP3502299B1 (en) | Hot-rolled galvanizing steel sheet having excellent galling resistance, formability and sealer-adhesion property and method for manufacturing same | |
KR101679159B1 (ko) | 용융 아연 도금 강판 | |
JP5907055B2 (ja) | 溶融亜鉛めっき鋼板 | |
CN108474092B (zh) | 高强度熔融镀敷热轧钢板及其制造方法 | |
WO2007029322A1 (ja) | 曲げ加工性に優れる溶融Zn-Al系合金めっき鋼材及びその製造方法 | |
WO2014189063A1 (ja) | 合金化溶融亜鉛めっき鋼板及びその製造方法 | |
JP7136342B2 (ja) | めっき鋼板 | |
JP7070795B2 (ja) | めっき鋼板 | |
CN115867693B (zh) | 镀覆钢材 | |
WO2021039973A9 (ja) | ホットスタンプ成形体 | |
JP7277822B2 (ja) | めっき鋼材 | |
WO2021039971A1 (ja) | ホットスタンプ成形体 | |
WO2005056863A1 (ja) | 溶融亜鉛めっき鋼板及びその製造方法 | |
WO2019124485A1 (ja) | 溶融めっき鋼線およびその製造方法 | |
JP2007314858A (ja) | 合金化溶融亜鉛めっき鋼板及びその製造方法 | |
JP7393551B2 (ja) | 加工性及び耐食性に優れたアルミニウム系合金めっき鋼板及びこの製造方法 | |
JP2003138359A (ja) | 溶融Zn−Al−Mg−Zr合金めっき鋼板およびその製造方法 | |
JPH06256925A (ja) | プレス成形性に優れた亜鉛−鉄合金化溶融亜鉛めっき鋼板 | |
JP3016122B2 (ja) | 塗装性に優れた合金化溶融亜鉛めっき鋼板とその製法 | |
JP3449244B2 (ja) | 合金化溶融亜鉛めっき鋼板の製造方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2005516195 Country of ref document: JP |
|
122 | Ep: pct application non-entry in european phase |