KR100256370B1 - The method for al coated sheet - Google Patents
The method for al coated sheet Download PDFInfo
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- KR100256370B1 KR100256370B1 KR1019950066226A KR19950066226A KR100256370B1 KR 100256370 B1 KR100256370 B1 KR 100256370B1 KR 1019950066226 A KR1019950066226 A KR 1019950066226A KR 19950066226 A KR19950066226 A KR 19950066226A KR 100256370 B1 KR100256370 B1 KR 100256370B1
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- Prior art keywords
- steel sheet
- plated steel
- plated
- aluminum
- cooling
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 83
- 239000010959 steel Substances 0.000 claims abstract description 83
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 52
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 52
- 238000001816 cooling Methods 0.000 claims abstract description 36
- 238000007747 plating Methods 0.000 claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims abstract 2
- 239000010410 layer Substances 0.000 description 37
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 229910052742 iron Inorganic materials 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000005755 formation reaction Methods 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 229910000640 Fe alloy Inorganic materials 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Classifications
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- 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
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
- C23C2/29—Cooling or quenching
-
- 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
- C23C2/12—Aluminium 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
Abstract
Description
본 발명은 가공성이 우수한 용융알루미늄 도금강판의 제조방법에 관한 것이며, 보다 상세히는 알루미늄 도금욕에서 용융알루미늄 도금된 도금강판을 효과적으로 냉각시킴으로써 표면외관 및 가공성을 향상시킬 수 있는 용융알루미늄 강판의 제조방법에 관한 것이다.The present invention relates to a method for manufacturing a molten aluminum plated steel sheet having excellent workability, and more particularly, to a method for manufacturing a molten aluminum steel sheet which can improve surface appearance and workability by effectively cooling a molten aluminum plated plated steel sheet in an aluminum plating bath. It is about.
알루미늄 도금강판의 우수한 내식성, 내열성, 내산화성 및 열반사성등으로 인하여 아연도금강판이 사용되지 못하는 높은 온도에서 널리 사용되고 있다. 일반 건자재는 물론 가열용 가전, 주방제품, 보일러, 열교환기, 벽난로 등에 널리 쓰이며 최근에는 자동차의 배기계통 재료로로 상당히 많은 양이 소비되고 있다. 알루미늄 도금강판은 도금층의 표면에 형성되는 안정된 산화막에 의하여 높은 온도에서도 쉽게 부식되지 않으며 또한 낮은 비중 때문에 동일한 도금 부착량에서 아연보다 거의 3배에 가까운 도금층 두께를 나타내므로 경제성 면에서도 많은 잇점을 지니고 있다.Due to the excellent corrosion resistance, heat resistance, oxidation resistance and heat reflectivity of aluminum plated steel sheet, it is widely used at high temperature where galvanized steel sheet cannot be used. It is widely used in general building materials as well as heating appliances, kitchen appliances, boilers, heat exchangers, fireplaces, etc. Recently, a considerable amount is consumed as an exhaust system material of automobiles. Aluminum plated steel sheet is not easily corroded even at high temperatures by the stable oxide film formed on the surface of the plated layer, and has a number of advantages in terms of economical efficiency because the plated layer shows almost three times the thickness of zinc at the same coating amount due to the low specific gravity.
알루미늄 도금강판은 여러 종류의 피복방법에 의해서 제조가 가능하지만 상업화되어 널리 쓰이는 제조방법은 일반적으로 용융도금 방법이 주류를 이루고 있다. 용융도금은 코일상태의 강판을 띠 형태로 풀면서 소둔로에서 높은 온도로 소둔시킴으로써 원하는 재료의 강도를 얻을 수 있으며 동시에 짧은 시간에 많은 양의 알루미늄을 강판의 표면에 도금을 하여 내식성과 강도를 모두 지닌 도금강판을 대량으로 제조할 수 있는 잇점을 갖고 있다. 도금된 강판은 미세한 표면압하 및 화학처리 공정을 거치면서 도금층의 표면 평활도 및 내식성이 보다 향상되어 진다.Aluminum plated steel sheet can be manufactured by various kinds of coating methods, but commercialized and widely used manufacturing methods are generally the hot dip plating method. Hot-dip galvanizing of coiled steel sheet can be achieved by annealing at high temperature in annealing furnace to obtain the strength of the desired material.At the same time, a large amount of aluminum is plated on the surface of the steel sheet for both corrosion resistance and strength. It has the advantage of being able to manufacture a large quantity of coated steel sheets. The plated steel sheet undergoes a fine surface pressure and a chemical treatment process, thereby improving the surface smoothness and corrosion resistance of the plated layer.
그러나, 용융도금은 이러한 여러 장점에도 불구하고 높은 온도에서 도금을 하여야 하므로 도금과정중에 알루미늄과 소지강판이 반응을 하여 매우 취성이 높은 알루미늄과 철의 합금층을 도금층과 소지강판의 계면에 형성시킨다. 즉, 650-670℃ 전후로 유지되는 도금욕을 빠져나온 도금강판은 상당시간 동안 알루미늄과 철이 반응하기에 충분한 높은 온도에서 유지되기 때문에 도금강판을 효과적으로 냉각처리하지 않으면 도금강판은 가공변형시키는 과정에서 많은 도금층의 이탈을 유발하게 되는 것이다.However, hot dip plating has to be plated at a high temperature in spite of many advantages such that aluminum and the steel sheet react during the plating process to form a very brittle alloy layer of aluminum and iron at the interface between the plating layer and the steel sheet. That is, the plated steel sheet that has exited the plating bath maintained at around 650-670 ° C is maintained at a high temperature sufficient for aluminum and iron to react for a considerable time. Therefore, if the plated steel sheet is not effectively cooled, the plated steel sheet may be subjected to many process deformations. This will cause the plating layer to escape.
미국특허 3, 959, 035에 의하면 상기와 같이 야기된 알루미늄 도금층의 균열을 방지하기 위해 도금후 260-538℃ 온도에서 10분 이상 열처리함을 개시하고 있다.US Patent 3, 959, 035 discloses heat treatment for 10 minutes at a temperature of 260-538 ℃ after plating to prevent cracking of the aluminum plating layer caused as described above.
이에 본 발명의 목적은 상기와 같은 알루미늄 용융도금의 문제점을 해결하여 도금층에서 발생하는 균열을 억제하는 용융알루미늄 도금강판의 제조방법을 제공하는데 있다.Accordingly, an object of the present invention is to provide a method of manufacturing a molten aluminum plated steel sheet which suppresses the cracks generated in the plating layer by solving the above problems of the aluminum hot-dip plating.
본 발명의 다른 목적은 도금층 균열이 방지될 뿐만 아니라 표면외관도 우수한 용융 알루미늄 도금강판의 제조방법을 제공하는데 있다.It is another object of the present invention to provide a method for producing a molten aluminum plated steel sheet which not only prevents cracking of the plating layer but also has excellent surface appearance.
본 발명에 의한 용융알루미늄 도금강판의 제조방법은, 강판을 통상의 방법으로 용융알루미늄 도금처리후 용융알루미늄 도금강판의 온도가 570-625℃ 범위에서 공기를 냉각원으로 하여 도금강판을 초당 4℃ 이상의 냉각속도로 냉각시켜 용융알루미늄 도금층을 응고시킴을 특징으로 한다.In the method for producing a molten aluminum plated steel sheet according to the present invention, the molten aluminum plated steel sheet after the hot-dip aluminum plating treatment in a conventional manner, the temperature of the molten aluminum plated steel sheet as the cooling source in the range of 570-625 ° C 4 ° C or more per second It is characterized by solidifying the molten aluminum plating layer by cooling at a cooling rate.
이하, 본 발명에 대하여 상세히 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.
본 발명의 방법에 의하면, 종래의 용융알루미늄 도금라인에서 비교적 용이한 방법으로 표면외관 및 가공성이 우수한 도금강판을 제조하기 위하여 용융알루미늄 도금처리후 도금강판이 적정 온도 이하에 이르렀을 때 공기의 강제분사에 의하여 도금 강판을 일제 냉각속도 이상으로 냉각시킴으로써, 도금층과 소지강판에 형성되는 합금층 및 도금층 표면의 요철 발달을 동시에 억제시킴으로서, 용융도금 공정에서 발생되기 쉬운 도금층의 가공성 열화를 방지함과 동시에 표면외관도 우수할 뿐만 아니라 종래의 내식성을 그대로 유지할 수가 있다.According to the method of the present invention, in order to produce a plated steel sheet having excellent surface appearance and workability by a relatively easy method in a conventional molten aluminum plating line, forced spraying of air when the plated steel sheet reaches a temperature below a suitable temperature after the molten aluminum plating treatment By cooling the plated steel sheet above the Japanese cooling rate by suppressing the uneven development of the alloy layer formed on the plated layer and the base steel plate and the surface of the plated layer at the same time, to prevent the deterioration of workability of the plated layer, which is likely to occur in the hot-dip plating process and at the same time Not only the appearance is excellent but also the conventional corrosion resistance can be maintained as it is.
일반적으로 용융알루미늄 도금강판의 도금층 가공성은 도금층과 소지강판의 계면에 형성되는 취성이 큰 알루미늄-철 합금층에 의해 저하되는데 본 발명자는 용융알루미늄 도금욕에서 알루미늄 도금된 도금강판의 가공성을 우수하게 하면서도 표면외관 역시 우수하게 유지시킬 수 있는 냉각조건을 발견하였다.In general, the plated layer formability of a molten aluminum plated steel sheet is degraded by a brittle aluminum-iron alloy layer formed at the interface between the plated layer and the base steel sheet. The inventors of the present invention provide excellent workability of an aluminum plated plated steel sheet in a molten aluminum plating bath. Surface appearances have also been found to maintain good cooling conditions.
알루미늄 도금욕의 온도는 통상 650-670℃로 유지되는데 이 온도는 알루미늄과 철이 상호 반응하여 화합물을 형성하기에 충분한 온도로써 도금강판이 도금욕에서 나온후 충분한 시간을 갖고 냉각되면 알루미늄과 철의 합금화는 계속 진행되어 도금층과 소지강판의 계면에서 취성이 매우 큰 알루미늄-철 합금층이 두껍게 형성되어 도금층의 가공에 따른 밀착성을 크게 해치게 된다. 그러나 본 발명에서는 도금강판이 알루미늄의 도금욕에서 빠져나온 후 도금강판을 공기로 강제 냉각시킴으로써 알루미늄과 철의 합금화에 의한 도금강판의 가공성 열화를 효과적으로 억제하는데 성공하였다.The temperature of the aluminum plating bath is usually maintained at 650-670 ° C. This temperature is sufficient to cause the aluminum and iron to react with each other to form a compound. When the plated steel is cooled for a sufficient time after leaving the plating bath, the aluminum and iron are alloyed. Continued to form a thick aluminum-iron alloy layer having a very brittle at the interface between the plated layer and the base steel sheet to greatly deteriorate the adhesion according to the processing of the plated layer. However, the present invention succeeded in effectively suppressing the workability deterioration of the plated steel sheet by alloying aluminum and iron by forcibly cooling the plated steel sheet with air after the plated steel sheet is taken out of the plating bath of aluminum.
통상적으로 강판의 두께가 얇으면 도금후 도금강판의 냉각은 빠르게 진행되므로 합금층의 형성에 의한 가공성의 열화가 크게 문제되지 않지만 강판의 두께가 두꺼워 질수록 도금후 도금강판의 냉각은 매우 느리게 진행되므로 강제로 냉각을 시키지 않으면 가공성이 심하게 나빠진다. 따라서 본 발명에서는 도금강판의 냉각속도는 초당 4.0℃ 이상으로 한정지었는데 이는 도금강판의 표면온도가 냉각 초기 온도로부터 350℃로 떨어질 때까지의 평균 냉각속도를 나타낸다. 350℃ 이하에서 알루미늄과 철의 상호 반응에 의한 합금층의 형성은 거의 진행되지 않으므로 그 이하의 온도에서는 가공성에 미치는 강판온도의 영향은 그리 크지 않는 것이다. 도금후 도금강판의 냉각속도가 초당 4.0℃ 이상에서 도금강판의 가공성은 모두 양호하나 냉각속도가 그 이하로 떨어지게 되면 도금강판의 냉각초기 온도에 무관하게 180도 굽힘 가공시에 굽힘부에서 균열이 발생하며 도금층의 밀착성을 나쁘게 하였다. 그러므로, 도금강판의 도금후 냉각속도는 초당 4.0℃ 이상으로 유지함이 가공성이 우수한 용융알루미늄 도금강판의 제조를 위하여 바람직하다.In general, when the thickness of the steel sheet is thin, the cooling of the plated steel sheet after the plating proceeds rapidly, so that deterioration of workability due to the formation of the alloy layer is not a big problem, but as the thickness of the steel sheet becomes thick, the cooling of the plated steel sheet after the plating proceeds very slowly. If forced cooling is not done, workability is badly worse. Therefore, in the present invention, the cooling rate of the plated steel sheet is limited to more than 4.0 ℃ per second, which represents the average cooling rate until the surface temperature of the plated steel drops to 350 ℃ from the initial cooling temperature. Since the formation of the alloy layer by the mutual reaction of aluminum and iron at less than 350 ℃ hardly proceeds, the influence of the steel sheet temperature on the workability is not so large at temperatures below that. After plating, all the workability of the plated steel sheet is good when the cooling rate of the plated steel sheet is 4.0 ℃ or more per second, but if the cooling rate falls below that, cracking occurs in the bent part during 180 degree bending process regardless of the initial cooling temperature of the plated steel sheet. And the adhesiveness of the plating layer was bad. Therefore, the cooling rate after plating of the plated steel sheet is preferably maintained at 4.0 ° C. or more per second for the manufacture of a molten aluminum plated steel sheet having excellent workability.
도금강판의 냉각 초기온도는 도금층의 가공성에 직접적인 영향을 미치지는 않았으나 도금층이 완전히 응고한 후의 표면요철에 영향을 미친다. 도금강판의 냉각을 625℃가 넘는 온도에서 실시하면 비교적 비중이 낮은 알루미늄은 분사되는 공기압에 의해서 미세한 분화구 형태의 모양을 나타내며 표면의 요철을 나타내게 된다.The initial temperature of cooling of the coated steel sheet did not directly affect the processability of the plated layer, but the surface unevenness after the plated layer was completely solidified. When cooling of the plated steel sheet is performed at a temperature above 625 ° C, aluminum having a relatively low specific gravity shows a fine crater shape by the spraying air pressure and shows surface irregularities.
이는 도금강판이 도금욕에서 나온 후 강판의 온도가 완전히 냉각되기 까지 도금강판의 온도는 표면과 내부에서 온도차이를 나타내는데, 이에 따라 도금강판 표면의 온도가 일시적으로 도금층의 응고온도 이하로 떨어졌다 하더라도 도금층 내부 및 소지 강판 온도가 표면보다 높게 유지되는 바, 이 상태에서 도금강판 표면에 계속해서 냉각 공기를 취입하게 되면 아연에 비해 비중이 낮은 용융알루미늄이 쉽게 손상을 입고 분화구와 같은 무늬를 도금층 표면에 낮기는 것이다. 그러나 도금강판의 표면이 625℃ 이하로 내려간 상태에서 공기분사에 의한 냉각을 실시하면 도금강판의 표면은 요철이 없는 양호한 표면외관을 나타내는 것이다. 한편, 570℃ 아래에서는 소지강판과 도금층의 경계면에서 알루미늄과 철의 반응이 이미 상당히 진행된후이므로 냉각효과에 의한 가공성의 향상을 기대하기가 어렵다. 그러므로 도금강판의 최초 냉각온도는 570-625℃ 범위로 함이 바람직하다.This is because the temperature of the plated steel sheet shows the temperature difference between the surface and the inside after the plated steel sheet is released from the plating bath and the temperature of the steel sheet is completely cooled. Therefore, even if the temperature of the plated steel sheet temporarily drops below the freezing temperature of the plated layer. The temperature of the inside of the plated layer and the holding steel plate is kept higher than the surface. If the cooling air is continuously blown onto the surface of the plated steel sheet, molten aluminum having a lower specific gravity than the zinc is easily damaged and a pattern such as a crater is formed on the surface of the plated layer. It is low. However, if the surface of the plated steel sheet is cooled by air spraying while the surface of the plated steel sheet is lowered to 625 ° C. or lower, the surface of the plated steel sheet exhibits a good surface appearance without irregularities. Meanwhile, below 570 ° C., since the reaction between aluminum and iron has already proceeded considerably at the interface between the base steel sheet and the plated layer, it is difficult to expect an improvement in workability due to the cooling effect. Therefore, the initial cooling temperature of the plated steel sheet is preferably in the range of 570-625 ℃.
이하, 실시예를 통하여 본 발명을 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.
통상의 연속 용융알루미늄 도금강판 제조방법에 의해 제조된 도금강판의 도금 부착량을 공기 분사법에 의하여 양면당 평균 100g/m2으로 조정되었으며 도금욕의 조성은 알루미늄과 규소과 무게비로 91:9로 유지되었다. 도금욕에서 용융도금된 강판은 직상으로 도금욕을 빠져나오면서 도금강판의 온도가 하기표 1에 명기된 온도에 이르렀을 때 강제 공기 냉각방식에 의해서 350℃까지 냉각처리되었고 이후는 자연냉각에 의해 상온까지 냉각되었다. 이와 같이 제조된 용융알루미늄 도금강판을 180도로 굽힘처리하여 굽혀진 부위에 대해서 가공성 평가를 하였다. 가공부의 전체 면적중에서 발생된 균열의 면적비가 20％를 넘어선 경우를 기준하여 가공성의 불량판정을 하였다.The coating weight of the plated steel sheet manufactured by the conventional continuous molten aluminum plated steel sheet manufacturing method was adjusted to an average of 100 g / m 2 per side by air spraying, and the composition of the plating bath was maintained at 91: 9 in terms of weight ratio of aluminum and silicon. . The hot-dip steel sheet in the plating bath was cooled to 350 ° C by forced air cooling when the temperature of the plated steel sheet reached the temperature specified in Table 1 while leaving the plating bath in a straight line. Cooled down. The molten aluminum plated steel sheet thus prepared was bent at 180 degrees to evaluate the workability of the bent portion. Defective workability was determined based on the case where the area ratio of cracks generated in the total area of the machined portion exceeded 20%.
도금강판의 가공성은 도금층과 소지철의 계면에 형성되는 매우 취약한 합금층의 형성에 기인하는데 하기표 1의 발명예에서 나타난 바와 같이 냉각속도가 초당 4.0℃이상에서 가공성은 양호하게 나왔으나 냉각속도가 그 아래로 떨어지게 되면 냉각초기의 강한 온도와 무관하게 가공성은 떨어졌다.The workability of the plated steel sheet is due to the formation of a very fragile alloy layer formed at the interface between the plated layer and the base steel. As shown in the invention example of Table 1, the workability was good at the cooling rate of 4.0 ° C or more per second, but the cooling rate was good. Falling below that, the processability declined, regardless of the initial cold temperatures.
한편, 도금강판의 표면외관은 도금강판이 완전히 응고한 후에 도금강판의 표면에 나타나는 도금층의 표면 요철에 의해 판정하였다.On the other hand, the surface appearance of the plated steel sheet was determined by the surface irregularities of the plated layer appearing on the surface of the plated steel sheet after the plated steel sheet was completely solidified.
하기표 1에 의하면 냉각초기 온도가 630℃ 이상인 경우 표면외관이 불량함을 알 수 있는 바, 이는 앞서 설명한 바와 같이 도금강판이 도금욕을 빠져나온 후 도금층 표면의 응고가 충분히 진행되기 전에 도금강판의 표면에 계속하여 냉각공기를 세게취임함으로써 연질상태의 도금층 표면은 쉽게 손상을 입으며 분화구와 같은 무늬를 도금층 표면에 형성시킨 것이다. 따라서 냉각 초기에 강판의 온도가 630℃ 이상에서는 양호한 도금층 표면외곽을 얻을 수가 없으며 또한 570℃ 아래에서는 알루미늄과 철의 합금층 형성반응이 이미 상딩히 진행된 상태이므로 냉각의 효과가 크게 작용하지 못한다. 그러므로 하기표 1의 발명예와 같이 공기 분사에 의한 강제냉각은 도금강판의 온도가 570-625℃ 범위에서 시작하여야만 요철이 없고 가공성이 좋은 알루미늄 도금층을 얻게 된다.According to Table 1, it can be seen that the surface appearance is poor when the initial cooling temperature is 630 ° C. or higher, which is as described above, after the plated steel leaves the plating bath, before solidification of the surface of the plated layer proceeds sufficiently. By continuing to hardly cool air on the surface, the surface of the soft plated layer is easily damaged and a pattern such as a crater is formed on the surface of the plated layer. Therefore, when the temperature of the steel sheet at the initial stage of cooling is not more than 630 ℃ good surface layer of the outer surface can not be obtained, and under 570 ℃ the alloy layer formation reaction of aluminum and iron has already proceeded in a phase of the cooling effect does not work significantly. Therefore, forced cooling by air injection, as shown in the invention example of Table 1 below to obtain an aluminum plated layer having good unevenness and workability only when the temperature of the plated steel sheet is started in the range of 570-625 ℃.
실시예를 통하여 알 수 있는 바와 같이 본 발명의 경우에는 도금강판의 가공성 및 표면외관이 모두 양호하게 판명되었으나 냉각초기의 도금강판의 온도와 냉각속도가 본 발명의 범위를 벗어나는 경우에는 용융알루미늄 도금강판의 가공성 및 표면외관이 본 발명예에 비하여 상대적으로 나쁘게 나타남을 알 수 있다.As can be seen from the embodiment of the present invention, both the workability and surface appearance of the plated steel sheet was found to be good, but the molten aluminum plated steel sheet when the temperature and cooling rate of the initial plated steel sheet outside the scope of the present invention It can be seen that the processability and surface appearance of are relatively poor compared to the present invention.
상기한 바와 같이 본 발명의 방법에 의하면 알루미늄 도금욕에서 용융알루미늄 도금된 도금강판을 효과적으로 냉각시킴으로써 가공성을 향상시켰을 뿐만 아니라 표면 외관도 우수한 알루미늄 도금 강판을 제조할 수 있는 것이다.As described above, according to the method of the present invention, it is possible to manufacture an aluminum plated steel sheet having an excellent surface appearance as well as improved workability by effectively cooling the molten aluminum plated plated steel sheet in an aluminum plating bath.
[표 1]TABLE 1
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