KR101188958B1 - A method of manufacturing steel sheet for automobile with high corrosion resistance and a plated steel sheet manufactured using the method - Google Patents
A method of manufacturing steel sheet for automobile with high corrosion resistance and a plated steel sheet manufactured using the method Download PDFInfo
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- KR101188958B1 KR101188958B1 KR1020100062481A KR20100062481A KR101188958B1 KR 101188958 B1 KR101188958 B1 KR 101188958B1 KR 1020100062481 A KR1020100062481 A KR 1020100062481A KR 20100062481 A KR20100062481 A KR 20100062481A KR 101188958 B1 KR101188958 B1 KR 101188958B1
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 69
- 239000010959 steel Substances 0.000 title claims abstract description 69
- 238000005260 corrosion Methods 0.000 title claims abstract description 54
- 230000007797 corrosion Effects 0.000 title claims abstract description 54
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims description 20
- 238000007747 plating Methods 0.000 claims abstract description 28
- 229910001297 Zn alloy Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 17
- 238000005275 alloying Methods 0.000 claims description 14
- 238000010791 quenching Methods 0.000 claims description 9
- 230000000171 quenching effect Effects 0.000 claims description 9
- 238000005246 galvanizing Methods 0.000 claims description 8
- 238000002791 soaking Methods 0.000 claims description 8
- 238000000137 annealing Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 238000007654 immersion Methods 0.000 claims 1
- 239000011777 magnesium Substances 0.000 abstract description 16
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 6
- 229910052749 magnesium Inorganic materials 0.000 abstract description 5
- 239000011701 zinc Substances 0.000 abstract description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract description 2
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 229910009369 Zn Mg Inorganic materials 0.000 description 4
- 229910007573 Zn-Mg Inorganic materials 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000010301 surface-oxidation reaction Methods 0.000 description 2
- APLNAFMUEHKRLM-UHFFFAOYSA-N 2-[5-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]-1,3,4-oxadiazol-2-yl]-1-(3,4,6,7-tetrahydroimidazo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C1=NN=C(O1)CC(=O)N1CC2=C(CC1)N=CN2 APLNAFMUEHKRLM-UHFFFAOYSA-N 0.000 description 1
- 229910018134 Al-Mg Inorganic materials 0.000 description 1
- 229910018467 Al—Mg Inorganic materials 0.000 description 1
- 229910003023 Mg-Al Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
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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
- C23C2/04—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
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
- C23C2/0224—Two or more thermal pretreatments
-
- 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
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
- C23C2/18—Removing excess of molten coatings from elongated material
- C23C2/20—Strips; Plates
-
- 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
- C23C2/34—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
자동차용 고내식성 도금 강판 및 그 제조방법에 관한 것으로, 보다 상세하게는 마그네슘(Mg)과 아연(Zn) 용탕을 이용하여 용접성을 향상시키고 고 내식성을 확보한 도금 강판 및 그 제조방법에 관하여 개시한다.
본 발명은 Mg: 0.3～3.0 중량%, 나머지가 Zn 및 불가피한 불순물로 된 용융 도금욕에 강재를 연속적으로 침지하여 Zn 합금 도금층이 강재에 표면에 제공되도록 하되, 상기 도금욕의 온도는 460±5℃ 인 것을 특징으로 하는 자동차용 고내식성 도금 강판 제조방법을 제공한다.The present invention relates to a highly corrosion-resistant plated steel sheet for automobiles and a method of manufacturing the same, and more particularly, to a plated steel sheet having improved weldability and securing high corrosion resistance by using magnesium (Mg) and zinc (Zn) molten metal, and a method of manufacturing the same. .
In the present invention, the steel is continuously immersed in a molten plating bath of Mg: 0.3 to 3.0% by weight, the remainder being Zn and unavoidable impurities, so that the Zn alloy plating layer is provided on the surface of the steel, but the temperature of the plating bath is 460 ± 5. It provides a high corrosion-resistant plated steel sheet manufacturing method for automobiles characterized in that.
Description
본 발명은 자동차용 고내식성 도금 강판 및 그 제조방법에 관한 것으로, 보다 상세하게는 마그네슘(Mg)과 아연(Zn) 용탕을 이용하여 용접성을 향상시키고 고 내식성을 확보한 도금 강판 및 그 제조방법에 관한 것이다.
The present invention relates to a highly corrosion-resistant plated steel sheet for automobiles and a method for manufacturing the same, and more particularly, to a plated steel sheet having improved weldability and securing high corrosion resistance by using magnesium (Mg) and zinc (Zn) molten metal. It is about.
현재 초고내석성을 발휘하는 강판은 Zn-Al-Mg의 3원 공정정점을 이용하여 저온 용탕을 가능하게 하고, 표면 형상을 제어한 것이 알려져 있다.It is known that steel sheets exhibiting ultra high stone resistance are capable of low-temperature melting using a three-way process peak of Zn-Al-Mg and control the surface shape.
그러나 도금층 중의 Al 및 Mg 은 강판의 용접을 방해하는 성분으로, 자동차용으로는 극히 제한적으로만 사용되고 있었다.However, Al and Mg in a plating layer are components which hinder the welding of a steel plate, and were used only in the case of automobiles.
본 발명은 Al의 사용을 배제하여, 고내식성을 가짐과 동시에 우수한 용접성을 가지는 자동차용 고내식성 도금 강판을 제공하기 위한 것이다.
The present invention is to provide a highly corrosion-resistant plated steel sheet for automobiles which have high corrosion resistance and excellent weldability by eliminating the use of Al.
본 발명의 목적은 고내식성과 함께 용접성을 확보하여 자동차용으로 사용될 수 있는 고내식성 도금 강판 및 그 제조방법을 제공함에 있다.An object of the present invention is to provide a high corrosion-resistant plated steel sheet and a method for manufacturing the same that can be used for automobiles by ensuring weldability with high corrosion resistance.
본 발명의 다른 목적은 용접성을 저해하는 알루미늄(Al)을 배제하고 Zn-Mg 용탕을 이용하여 용접성과 고내식성을 확보할 수 있는 도금 강판 및 그 제조방법을 제공함에 있다.
It is another object of the present invention to provide a plated steel sheet and a method of manufacturing the same, which excludes aluminum (Al) that inhibits weldability and secures weldability and high corrosion resistance using Zn-Mg molten metal.
본 발명은 Mg: 0.3～3.0 중량%, 나머지가 Zn 및 불가피한 불순물로 된 용융 도금욕에 강재를 연속적으로 침지하여 Zn 합금 도금층이 강재에 표면에 제공되도록 하되, 상기 도금욕의 온도는 460±5℃ 인 것을 특징으로 하는 자동차용 고내식성 도금 강판 제조방법을 제공한다.
In the present invention, the steel is continuously immersed in a molten plating bath of Mg: 0.3 to 3.0% by weight, the remainder being Zn and unavoidable impurities, so that the Zn alloy plating layer is provided on the surface of the steel, but the temperature of the plating bath is 460 ± 5. It provides a high corrosion-resistant plated steel sheet manufacturing method for automobiles characterized in that.
이 때, 상기 도금욕에서 인출된 강재는 합금화 가열구간(Galvanizing heating section)과, 합금화 소둔구간(Galvanizing soaking section)을 거치되, 상기 합금화 가열구간의 온도 및 상기 합금화 소둔구간의 온도는 510±5℃ 인 것이 바람직하다.
At this time, the steel drawn out from the plating bath is subjected to a galvanizing heating section and a galvanizing soaking section, wherein the temperature of the alloying heating section and the temperature of the alloying annealing section are 510 ± 5. It is preferable that it is ° C.
그리고, 상기 도금욕에서 인출된 강재는 상기 합금화 가열구간으로 인입되기 이전에 에어나이프(Air knife)를 통과하되, 상기 에어나이프의 유량은 300±10L/min 인 것이 바람직하다.
The steel drawn out from the plating bath passes through an air knife before being drawn into the alloying heating section, but the flow rate of the air knife is preferably 300 ± 10 L / min.
아울러, 상기 합금화 소둔구간을 거친 강재는 공기를 분사하여 강대를 냉각시키는 최종냉각대를 통과하되, 상기 최종냉각대에서 분사되는 공기의 유량은 300±10L/min 인 것이 바람직하다.
In addition, the steel material passed through the alloying annealing section is passed through the final cooling zone for cooling the steel strip by injecting air, the flow rate of the air injected from the final cooling zone is preferably 300 ± 10L / min.
또한, 상기 강재는 도금욕에 침지되기 이전에 예열구간(pre-heating section), 가열구간(radiant tube heating section), 소둔구간(radiant tube heat soaking section), 가스젯 쿨링구간(gas jet cooling section) 및 급속 퀀칭 구간(rapid quenching section)을 거치되, 상기 예열구간의 온도는 380±5℃ 인 것이 바람직하고, In addition, the steel is pre-heating section, radiant tube heating section, radiant tube heat soaking section, gas jet cooling section before being immersed in the plating bath. And through a rapid quenching section (rapid quenching section), the temperature of the preheating section is preferably 380 ± 5 ℃,
상기 가열구간 및 상기 소둔구간의 온도는 810±5℃ 인 것이 바람직하며,The temperature of the heating section and the annealing section is preferably 810 ± 5 ℃,
상기 가스젯 쿨링 구간의 온도는 680±5℃ 인 것이 바람직하고,The temperature of the gas jet cooling section is preferably 680 ± 5 ℃,
상기 급속 퀀칭 구간의 온도는 460±5℃ 인 것이 바람직하다.
The temperature of the rapid quenching section is preferably 460 ± 5 ℃.
이러한 방법을 이용하면, Mg: 0.3～3.0 중량%, 나머지가 Zn 및 불가피한 불순물로 된 용융 Zn 합금 도금층이 강재의 표면에 제공되는 것을 특징으로 하는 자동차용 고내식성 도금 강판을 제조할 수 있다.
Using this method, it is possible to produce a highly corrosion-resistant plated steel sheet for automobiles, characterized in that a molten Zn alloy plating layer comprising Mg: 0.3 to 3.0 wt%, the remainder being Zn and inevitable impurities is provided on the surface of the steel.
본 발명에 따른 고내식성 도금 강판 및 그 제조방법은 Zn 합금 도금층으로 인하여 우수한 내식성을 확보할 수 있는 효과를 가져온다.Highly corrosion-resistant plated steel sheet and a method for manufacturing the same according to the present invention has the effect of ensuring excellent corrosion resistance due to the Zn alloy plating layer.
또한 본 발명에 따른 고내식성 도금 강판 및 그 제조방법은 Al성분을 줄이고 510℃ 내외에서 열처리함으로써 Zn-Mg 상의 형성을 촉진시켜 용접성을 향상시키는 효과도 가져온다.
In addition, the high corrosion-resistant plated steel sheet according to the present invention and a method of manufacturing the same by reducing the Al component and heat treatment at about 510 ℃ to promote the formation of Zn-Mg phase also brings the effect of improving the weldability.
도 1은 본 발명에 따른 자동차용 고내식성 도금 강판 제조 방법을 개략적으로 나타내는 공정순서도이다.1 is a process flowchart schematically showing a method for manufacturing a highly corrosion-resistant plated steel sheet for automobiles according to the present invention.
이하, 첨부된 도면을 참조하여 본 발명에 따른 자동차용 고내식성 도금 강판 및 그 제조방법에 대하여 상세히 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail a highly corrosion-resistant plated steel sheet for automobiles and a method for manufacturing the same.
후술되는 용어들은 본 발명에서의 기능을 고려하여 정의된 용어들로써, 이는 사용자, 운용자의 의도 또는 관례에 따라 달라질 수 있다.The terms to be described below are terms defined in consideration of functions in the present invention, and may vary according to the intention or convention of a user or an operator.
그러므로, 이러한 용어들에 대한 정의는 본 명세서 전반에 걸친 내용을 토대료 내려져야 할 것이다.
Therefore, definitions of these terms should be based on the contents throughout the specification.
도 1은 본 발명에 따른 자동차용 고내식성 도금 강판 제조 방법을 개략적으로 나타내는 공정순서도이다.1 is a process flowchart schematically showing a method for manufacturing a highly corrosion-resistant plated steel sheet for automobiles according to the present invention.
본 발명은 Zn-Mg 용탕에 강재를 연속적으로 침지한 후, 합금화하여 강재 표면에 합금 도금층이 형성되도록 하는 것이다.
The present invention is to continuously immerse the steel in the molten Zn-Mg, and then alloyed to form an alloy plating layer on the surface of the steel.
도시된 바와 같이, 강재는 연속적으로 예열구간(pre-heating section)(10), 가열구간(radiant tube heating section)(20), 소둔구간(radiant tube heat soakingsection)(30), 가스젯 쿨링구간(gas jet cooling section)(40), 급속 퀀칭 구간(rapid quenching section)(50), 용융 도금욕(Pot)(60), 에어나이프(Air kife)(70), 합금화 가열구간(Galvanizing heating section)(80)과, 합금화 소둔구간(Galvanizing soaking section)(90), 최종냉각대(Final cooling)(100)를 거치게 된다.As shown, the steel is continuously pre-heated
예열구간(pre-heating section)(10)에서는 강재를 380±5℃ 로 승온하고, 가열구간(radiant tube heating section)(20)에서 810±5℃ 로 가열하고, 소둔구간(radiant tube heat soakingsection)(30)에서는 강재가 이 온도를 유지하도록 한다. 여기서 ±5℃ 는 오차범위를 고려한 온도범위이며, 이하 다른 구간의 온도에서도 동일하다.In the pre-heating section (10), the steel is heated to 380 ± 5 ° C, heated in a radiant tube heating section (20) to 810 ± 5 ° C, and radiant tube heat soaking section At 30, the steel is maintained at this temperature. Here ± 5 ℃ is a temperature range in consideration of the error range, the same in the temperature of the other section below.
다음으로, 강재는 가스젯 쿨링구간(gas jet cooling section)(40)에서 680±5℃ 로 1차 냉각되고, 급속 퀀칭 구간(rapid quenching section)(50)에서 도금욕의 온도와 동일한 온도인 460±5℃로 냉각된 후 용융 도금욕(60)에 침치된다.
Next, the steel is first cooled to 680 ± 5 ° C. in the gas
용융 도금욕(60)은 강재가 연속적으로 침지되어 표면에 도금층이 부착되도록 한다. 본 발명은 용융 도금욕(60)의 조성을 Mg: 0.3～3.0 중량%, 나머지가 Zn 및 불가피한 불순물로 하는 것을 특징으로 한다. Hot-
즉 일반적으로 Al, Mg, Zn 으로 구성되는 용융 도금욕을 사용하나, 본 발명은 용접성을 향상시키기 위하여 Al 성분을 배제하는 것을 특징으로 한다. 여기서 Al 성분을 배제한다는 것은 인위적으로 용탕에 Al을 첨가하지 않는 것을 의미하며, 불가피하게 포함되는 Al까지 제거한다는 의미는 아니다. 도금욕의 온도는 460±5℃ 인 것이 바람직하다. 도금욕의 온도가 상기 범위를 초과하게 되면 도금 밀착성이 저하된다.
That is, although a hot dip bath generally composed of Al, Mg, and Zn is used, the present invention is characterized by excluding an Al component in order to improve weldability. Excluding Al component here means not artificially adding Al to the molten metal, and does not mean removing Al that is inevitably included. It is preferable that the temperature of a plating bath is 460 +/- 5 degreeC. When the temperature of a plating bath exceeds the said range, plating adhesiveness will fall.
도금층 중의 Mg은 도금층 표면에 균일한 부식 생성물을 생성시켜, 도금강판의 내식성을 현저하게 높이는 작용을 한다. Mg 함유량이 0.3 중량% 미만인 경우에는 부식 생성물을 균일하게 생성시키는 작용이 불충분하여 내식성 향상의 효과가 미미하다. 반대로 Mg의 함유량이 3.0 중량%를 초과하면 내식성 향상의 효과는 포화하고 오히려 용탕 표면 산화를 유발하여 바람직하지 못하다.
Mg in the plating layer produces a uniform corrosion product on the surface of the plating layer, and serves to significantly increase the corrosion resistance of the plated steel sheet. If the Mg content is less than 0.3% by weight, the effect of uniformly generating corrosion products is insufficient, and the effect of improving corrosion resistance is insignificant. On the contrary, when the content of Mg exceeds 3.0% by weight, the effect of improving the corrosion resistance is saturated, and rather it causes the surface oxidation of the melt, which is not preferable.
에어나이프(Air kife)(70)는 고압의 에어를 분사하여 강재의 표면에 부착된 도금층이 균일하게 형성되도록 하는 역할을 수행한다. 본 발명에서 상기 에어나이프(70)에서 분사되는 압축공기의 유량은 300L/min 인 것이 바람직하다.The
합금화 가열구간(Galvanizing heating section)(80)에는 합금화 시작온도인 510±10℃ 까지 가열되고, 합금화 소둔구간(Galvanizing soaking section)(90)에서는 그 온도가 유지되어지면서 강재의 합금화 반응을 지속시키기 위한 반응을 유지하도록 한다.The
최종냉각대(Final cooling)(100)에서는 강재의 표면에 기체를 분사하여 강재의 온도를 하강시켜 합금화 반응을 억제하게 된다. 이 때 분사되는 기체의 유량은 300L/min 인 것이 바람직하다.
In the final cooling (100) (100) to inject a gas on the surface of the steel to reduce the temperature of the steel to suppress the alloying reaction. It is preferable that the flow volume of the gas injected at this time is 300 L / min.
실시예Example
표1과 같은 조성을 가지는 용탕을 이용하여,Using the molten metal having the composition shown in Table 1,
표2와 같은 공정조건으로 도금 강판을 제조하였다.The plated steel sheet was manufactured under the process conditions as shown in Table 2.
강재의 이송속도는 150m/min 으로 실시하였다.
The feed rate of the steel was carried out at 150 m / min.
1. 내식성 평가1. Corrosion resistance evaluation
내식성은 SST(JIS-Z-2371에 따른 염수분무시험)를 800시간 한 후의 부식감량(g/m2)으로 평가하였다. 그리고 드로스의 발생량은 눈으로 보아 많은 것을 ×, 약간 많은 것을 △, 적은 것을 ◎로 하여 평가하였다.Corrosion resistance was evaluated by corrosion loss (g / m 2 ) after 800 hours of SST (salt spray test according to JIS-Z-2371). The amount of dross generated was evaluated by visually seeing many things as x, a little more as Δ, and a few as ◎.
평가 결과는 아래의 표 3과 같다.The evaluation results are shown in Table 3 below.
비교예2
Comparative Example 2
4
4
우선부식Zn11Mg 2 Tablet
Priority Corrosion
×
×
상기의 결과를 살펴보면, Mg의 함유량이 0.3 중량% 미만인 경우 내식성 향상 효과가 미미한 것을 알 수 있으며, Mg 함유량이 3.0 중량%를 초과하는 경우 내식성 향상의 효과는 포화하고 오히려 용탕 표면 산화를 유발하여 드로스가 발생함을 알 수 있다.Looking at the above results, it can be seen that the effect of improving the corrosion resistance is insignificant when the Mg content is less than 0.3% by weight, and the effect of improving the corrosion resistance is saturated when the Mg content is more than 3.0% by weight, rather it causes the surface oxidation of the draw It can be seen that a switch is generated.
또한, 본 발명의 고내식성 도금 강판은 종래의 GA강판(합금화용융도금강판) 에 비하여 우수함을 알 수 있다.
In addition, it can be seen that the high corrosion-resistant plated steel sheet of the present invention is superior to the conventional GA steel sheet (alloyed hot dip steel sheet).
2. 용접성 평가2. Weldability Evaluation
교류식 스폿용접기를 사용하여 760A로 용접전류를 고정시킨 후, 연속적으로 스폿용접을 실시하였다. 이 때 타점방법은 1초에 1타점씩 20타점을 연속 실시한 다음 40초간 휴지하는 공정을 반복하였는데, 100타점마다 전단인장시험편을 채취하여 강도를 측정하였다.After the welding current was fixed to 760A using an AC spot welder, spot welding was performed continuously. At this time, the RBI method performed 20 RBIs one by one and then rested for 40 seconds. The shear tensile test pieces were taken every 100 RBIs and the strength was measured.
이때의 전단인장강도 값이 공업규격의 B급 강도이하로 되는 시점의 타점수와 파탄형태가 플러그(plug)형 파단에서 인터페이스(interface)형 파단으로 전환되는 타점수를 포함하여 연속타점수로 용접성을 평가하였다.Weldability with continuous RBI, including RBI at the point when shear tensile strength is less than Class B strength of industry standard and RBI at break type converted from plug type to interface type Was evaluated.
평가결과는 아래의 표 4와 같다.The evaluation results are shown in Table 4 below.
상기의 결과를 살펴보면, Mg 함유량이 증가함에 따라 Zn-Mg 상이 증가하여 용접성이 향상되는 것을 알 수 있으며, 본원발명의 고내식성 도금 강판이 종래의 GI강판(Zn-Mg-Al 용탕)에 비하여 우수한 용접성을 나타냄을 알 수 있다.
Looking at the above results, it can be seen that as the Mg content increases, the Zn-Mg phase increases to improve weldability, and the high corrosion-resistant plated steel sheet of the present invention is superior to the conventional GI steel sheet (Zn-Mg-Al molten metal). It can be seen that the weldability.
살펴본 바와 같이, 본 발명에 따른 고내식성 도금 강판은 GA강판 보다 우수한 내식성을 나타내며, GI강판 보다 우수한 용접성을 나타냄으로써, 우수한 용접성과 함께 고내식성을 요구하는 자동차용 강판에 적합함을 알 수 있다.
As described above, the high corrosion-resistant plated steel sheet according to the present invention exhibits better corrosion resistance than GA steel sheet, and shows better weldability than GI steel sheet, and thus, it can be seen that it is suitable for automotive steel sheets requiring high corrosion resistance with excellent weldability.
본 발명은 도면에 도시된 실시예를 참고로 하여 설명되었으나, 이는 예시적인 것에 불과하며, 당해 기술이 속하는 분야에서 통상의 지식을 가진 자라면 이로부터 다양한 변형 및 균등한 타 실시예가 가능하다는 점을 이해할 것이다.While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand.
따라서, 본 발명의 진정한 기술적 보호범위는 아래의 특허청구범위에 의해서 정하여져야 할 것이다.
Therefore, the true technical protection scope of the present invention will be defined by the claims below.
10 : 예열구간(pre-heating section)
20 : 가열구간(radiant tube heating section)
30 : 소둔구간(radiant tube heat soakingsection)
40 : 가스젯 쿨링구간(gas jet cooling section)
50 : 급속 퀀칭 구간(rapidquenching section)
60 : 용융 도금욕(pot)
70 : 에어나이프(Air kife)
80 : 합금화 가열구간(Galvanizing heating section)
90 : 합금화 소둔구간(Galvanizing soaking section)
100 : 최종냉각대(Final cooling)10: pre-heating section
20: radiant tube heating section
30: radiant tube heat soakingsection
40: gas jet cooling section
50: rapid quenching section
60: hot dip bath
70: air kife
80: Galvanizing heating section
90: Galvanizing soaking section
100: Final cooling
Claims (9)
Mg: more than 2.0% by weight, 3.0% by weight or less, the rest of the steel is continuously immersed in the hot-dip galvanizing bath consisting of Zn and unavoidable impurities so that the Zn alloy plating layer is provided on the surface of the steel, the temperature of the plating bath is 460 ± High corrosion-resistant plated steel sheet manufacturing method characterized in that 5 ℃.
상기 도금욕에서 인출된 강재는 합금화 가열구간(Galvanizing heating section)과, 합금화 소둔구간(Galvanizing soaking section)을 거치되, 상기 합금화 가열구간의 온도 및 상기 합금화 소둔구간의 온도는 510±5℃ 인 것을 특징으로 하는 자동차용 고내식성 도금 강판 제조방법.
The method of claim 1,
The steel drawn out from the plating bath is subjected to an alloying heating section and a galvanizing soaking section, wherein the temperature of the alloying heating section and the temperature of the alloying annealing section are 510 ± 5 ° C. High corrosion-resistant plated steel sheet manufacturing method for automobiles.
상기 도금욕에서 인출된 강재는 상기 합금화 가열구간으로 인입되기 이전에 에어나이프(Air knife)를 통과하되, 상기 에어나이프의 유량은 300±10L/min인 것을 특징으로 하는 자동차용 고내식성 도금 강판 제조방법.
The method of claim 2,
The steel drawn out from the plating bath passes through an air knife before being drawn into the alloying heating section, but the flow rate of the air knife is 300 ± 10L / min, manufacturing a highly corrosion-resistant plated steel sheet for automobiles. Way.
상기 합금화 소둔구간을 거친 강재는 공기를 분사하여 강대를 냉각시키는 최종냉각대를 통과하되, 상기 최종냉각대에서 분사되는 공기의 유량은 300±10L/min인 것을 특징으로 하는 자동차용 고내식성 도금 강판 제조방법.
The method of claim 2,
The steel material passed through the alloying annealing section passes through the final cooling zone to cool the steel strip by injecting air, the flow rate of the air injected from the final cooling zone is 300 ± 10L / min high corrosion-resistant plated steel sheet for automobiles Manufacturing method.
상기 강재는 도금욕에 침지되기 이전에 예열구간(pre-heating section), 가열구간(radiant tube heating section), 소둔구간(radiant tube heat soaking section), 가스젯 쿨링구간(gas jet cooling section) 및 급속 퀀칭 구간(rapid quenching section)을 거치되, 상기 예열구간의 온도는 380±5℃ 인 것을 특징으로 하는 고내식성 도금 강판 제조방법.
The method of claim 1,
The steel may be preheated, radiated tube heating, radiant tube heat soaking, gas jet cooling and rapid before immersion in the plating bath. After passing through a quenching section (rapid quenching section), the temperature of the preheating section is a high corrosion-resistant plated steel sheet manufacturing method, characterized in that.
상기 가열구간 및 상기 소둔구간의 온도는 810±5℃ 인 것을 특징으로 하는 고내식성 도금 강판 제조방법.
The method of claim 5, wherein
The heating section and the annealing section temperature is 810 ± 5 ℃ characterized in that the high corrosion-resistant coated steel sheet manufacturing method.
상기 가스젯 쿨링 구간의 온도는 680±5℃ 인 것을 특징으로 하는 고내식성 도금 강판 제조방법.
The method of claim 5, wherein
The gas jet cooling section is a temperature of 680 ± 5 ℃ high corrosion-resistant plated steel manufacturing method characterized in that.
상기 급속 퀀칭 구간의 온도는 460±5℃ 인 것을 특징으로 하는 고내식성 도금 강판 제조방법.
The method of claim 5, wherein
The temperature of the rapid quenching section is a high corrosion-resistant plated steel sheet manufacturing method, characterized in that 460 ± 5 ℃.
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| JPS56152956A (en) | 1980-04-25 | 1981-11-26 | Nippon Steel Corp | Manufacture of steel sheet coated with zinc-magnesium alloy by hot dipping |
| JP2006144104A (en) * | 2004-11-24 | 2006-06-08 | Nippon Steel Corp | Apparatus and method for continuously annealing steel sheet for hot dip galvanizing |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56152956A (en) | 1980-04-25 | 1981-11-26 | Nippon Steel Corp | Manufacture of steel sheet coated with zinc-magnesium alloy by hot dipping |
| JP2006144104A (en) * | 2004-11-24 | 2006-06-08 | Nippon Steel Corp | Apparatus and method for continuously annealing steel sheet for hot dip galvanizing |
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| KR101491098B1 (en) * | 2012-12-27 | 2015-02-09 | 주식회사 포스코 | Magnesium plate and method for manufacturing the same |
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