KR20020051965A - Method and Device for heat treatment Galvanized sheets - Google Patents
Method and Device for heat treatment Galvanized sheets Download PDFInfo
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- KR20020051965A KR20020051965A KR1020000079943A KR20000079943A KR20020051965A KR 20020051965 A KR20020051965 A KR 20020051965A KR 1020000079943 A KR1020000079943 A KR 1020000079943A KR 20000079943 A KR20000079943 A KR 20000079943A KR 20020051965 A KR20020051965 A KR 20020051965A
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- steel sheet
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000007747 plating Methods 0.000 claims abstract description 20
- 239000011449 brick Substances 0.000 claims abstract description 16
- 230000005855 radiation Effects 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 15
- 239000000571 coke Substances 0.000 claims abstract description 13
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 27
- 239000008397 galvanized steel Substances 0.000 claims description 27
- 239000000446 fuel Substances 0.000 claims description 7
- 238000009987 spinning Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims 1
- 238000005275 alloying Methods 0.000 abstract description 30
- 238000012545 processing Methods 0.000 abstract description 5
- 238000000227 grinding Methods 0.000 abstract description 3
- 239000011247 coating layer Substances 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 17
- 239000010959 steel Substances 0.000 description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 239000000843 powder Substances 0.000 description 10
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- 239000010960 cold rolled steel Substances 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005246 galvanizing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000003708 edge detection Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910001026 inconel Inorganic materials 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000013441 quality evaluation Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/007—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
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Thermal Sciences (AREA)
- Coating With Molten Metal (AREA)
Abstract
Description
본 발명은, 자동차용 강판등에 사용되는 아연도금 강판의 열처리방법및 장치에 관한 것으로서 이는 특히, 연속식 용융아연도금 냉연강판의 제조공정에서 열처리된 강판을 내파우더링성 및 표면품질을 향상시키기 위하여 용융아연도금후 간접가열 방식에 의해 합금화 열처리를 수행하며, 상기 열처리 작업의 수행시 열처리 개구부에서 외부의 공기 출입을 방지토록 실링장치를 설치하여 아연도금 강판의 품질을 향상시키도록 하는 것을 특징으로 한다.The present invention relates to a method and apparatus for heat treatment of a galvanized steel sheet used in automotive steel plates, and the like, in particular, melting the steel sheet heat-treated in the manufacturing process of the continuous hot-dip galvanized cold-rolled steel sheet to improve the powder resistance and surface quality Alloying heat treatment is performed by indirect heating after galvanizing, and when the heat treatment is performed, a sealing device is installed to prevent external air from entering the heat treatment opening, thereby improving the quality of the galvanized steel sheet.
일반적으로, 합금화 용융아연도금강판은 도장성, 도장후 냉식성이 우수하여 최근에는 건축자재나 가정용및 자동차 생산용 강판으로 그 수요가 중대되고 있는 것이다.In general, alloyed hot-dip galvanized steel sheet is excellent in paintability and post-painting cold resistance, and in recent years, the demand for steel sheets for building materials, household and automobile production is of great importance.
아연도금강판의 제조방법은, 연속용융 아연도금공정에서 도금된 강판을 코크스 오븐가스와 공기를 혼합하여 화염을 발생시키는 장치에 의해 직접가열하여 합금화 열처리 하여 제조되고, 이를 구체적으로 살펴보면 합금화 용융아연도금 강판을 소지강판이 1차로 아연도금이 이루어진 상태에서 연속적으로 약 470~560℃의 온도범위로 가열하게 되고, 이때 도1에서와 같이, 상기 소자철의 철성분과 도금층의 아연성분이 상호 확산되어 ζ상, δ1상, Γ상 등의 Fe-Zn계 금속간 화합물이 성장하여 합금화 용융아연도급층이 형성된다.In the manufacturing method of the galvanized steel sheet, the plated steel plate in the continuous hot dip galvanizing process is manufactured by directly heating the alloyed heat treatment by mixing the coke oven gas and air to generate a flame, and the alloy hot-dip zinc plating In the state where the steel sheet is first galvanized steel plate is continuously heated to a temperature range of about 470 ~ 560 ℃, as shown in Figure 1, the iron component of the element iron and the zinc component of the plating layer is mutually diffused Fe-Zn-based intermetallic compounds such as ζ phase, δ1 phase, and Γ phase grow to form an alloyed hot dip galvanized layer.
상기 합금화 용융아연도금강판의 품질특성은 스폿용접성, 도장후 내식성및 도장밀착성이 우수하지만 상기 합금화 처리시 과합금화된 강판은 가공시 도금층이 분말형태로 떨어지는 파우더랑 현상이 발생되는 문제점이 발생되고, 상기 파우더링은 합금철의 철농도에 따라 비례하여 열화되나 밀착성 및 용접성은 반대로 향상된다.The quality characteristics of the alloyed hot-dip galvanized steel sheet is excellent in spot weldability, corrosion resistance and paint adhesion after coating, but the alloyed steel sheet over-alloyed during the alloying process occurs a problem that the powder falls into powder form during processing, The powder ring deteriorates in proportion to the iron concentration of the ferroalloy, but the adhesion and weldability are reversely improved.
따라서, 이러한 제반 특성을 고려할때 합금화 용융아연도금강판의 도금층 최적 농도는 8~12%로 비교적 좁게 형성되며, 주상으로 δ1상을 갖도록 함이 일방적인 제조공정이고, 이를 위하여 합금화 열처리시 열처리로의 실링이 매우 중요한 인자가 되는 것이다.Therefore, in consideration of these characteristics, the optimal concentration of the plating layer of the alloyed hot-dip galvanized steel sheet is relatively narrow (8-12%), and it is one-sided manufacturing process to have the δ1 phase as the main phase. Sealing is a very important factor.
이와같은 아연도금강판의 제조공정은 도2에서와 같이, 냉연강판(101)이 도금조(102)를 통과한후 에어나이프(103)에 의해 냉연강판(101) 표면의 도금량을 제어하고, 상기 도금량의 제어가 완료되면 내화벽돌로 축조되면서 내부에 설치되는 버너(105)에 코크스와 공기를 공급하여 화염을 발생토록 하는 합금화 열처리조(104)에 투입하고, 이때 상기 표면도금된 냉연강판(101)이 화염에 직접 접촉되어 합금화 처리됨으로써 적정 합금화도를 확보토록 하고, 적정합금화도를 갖는 냉연강판을 냉각대(108)로서 냉각함으로써 합금화 용융아연도금 강판을 제조하였다.In the manufacturing process of such a galvanized steel sheet, as shown in FIG. 2, after the cold rolled steel sheet 101 passes through the plating bath 102, the plating amount of the surface of the cold rolled steel sheet 101 is controlled by the air knife 103. When the control of the plating amount is completed, while supplying coke and air to the burner 105 installed therein while being constructed as a refractory brick, it is introduced into the alloy heat treatment tank 104 to generate a flame, and the surface-plated cold rolled steel sheet 101 ) Alloyed by direct contact with the flame to ensure an appropriate degree of alloying, and the alloyed hot-dip galvanized steel sheet was manufactured by cooling the cold rolled steel sheet having the appropriate alloying degree as a cooling stage 108.
그러나, 합금화 열처리시 강판을 직접 가열하는 방식을 적용할 경우 화염이 닿는 부분과 닿지 않는 부분과의 강판온도 차이가 발생되고, 화염이 직접 닿을 경우에도 강판의 형상이 요철부가 있다던가 화염의 길이에 따라 도금강판의 합금화 품질 편차가 발생되어 제품을 신뢰성을 해치게 되는 단점이 있다.However, when the method of directly heating the steel sheet during the alloying heat treatment, the steel sheet temperature difference between the portion where the flame touches and the portion that does not touch occurs, and even when the flame directly touches, the shape of the steel sheet may have irregularities or lengths of flame. Accordingly, there is a disadvantage in that the alloying quality deviation of the plated steel sheet is generated to damage the reliability of the product.
또한, 미합금화 된 부분의 합금화를 상승토록 전체적으로 코크스가스및 공기의 량을 증대시켜 합금화 온도를 상승시키게 되는데 이럴 경우 정상적으로 합금화가 이루어진 부분에 과합금화가 발생되어 가공성에 취약한 조직이 형성되고, 이에따라 가공시 도금층이 분리되는 파우더링 현상이 발생되며, 합금화로 출구측이 개방되어 외기와의 접촉량이 많아져 불균일한 열화및 합금화가 불균하게 수행되는 단점이 있는 것이다.In addition, the alloying temperature of the unalloyed portion is increased to increase the amount of coke gas and air as a whole to increase the alloying temperature. In this case, overalloying occurs in the alloyed portion, thereby forming a structure that is vulnerable to processability, and thus processing Powdering phenomenon is generated when the plating layer is separated, and the exit side is opened by alloying to increase the amount of contact with the outside air, there is a disadvantage that uneven deterioration and alloying is performed unevenly.
본 발명은 상기와 같은 종래의 여러 문제점들을 개선시키기 위한 것으로서 그 목적은, 강판의 간접가열을 이용하여 아연도금강판의 도금층 과합금화를 방지하고, 내파우더링성및 합금화의 균일도및 가공특성을 극대화 하는 아연도금 강판의 열처리방법 및 장치를 제공하는데 있다.The present invention is to improve the various problems as described above, the object of the present invention is to prevent the over-plating of the plating layer of the galvanized steel sheet using indirect heating of the steel sheet, to maximize the powder resistance and uniformity and processing characteristics of the alloying The present invention provides a method and apparatus for heat treatment of a galvanized steel sheet.
도1는 일반적인 아연도금 강판의 철함량에 따른 가공성을 도시한 그래프도1 is a graph showing the workability according to the iron content of a general galvanized steel sheet
도2는 종래의 아연도금 강판의 열처리 장치를 도시한 공정흐름도Figure 2 is a process flow diagram showing a heat treatment apparatus of a conventional galvanized steel sheet
도3은 본 발명에 따른 아연도금 강판의 열처리로를 도시한 개략도3 is a schematic view showing a heat treatment furnace of a galvanized steel sheet according to the present invention.
도4는 본 발명에 따른 열처리로의 방사관 작동상태를 도시한 개략도Figure 4 is a schematic diagram showing the operating state of the radiation tube of the heat treatment furnace according to the present invention
도5는 본 발명에 따른 열처리로를 도시한 단면구조도Figure 5 is a cross-sectional structural view showing a heat treatment furnace according to the present invention
* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings
4...열처리 로 10...실링 플레이트4 ... heat treatment furnace 10 ... sealing plate
11...방사관 19...개구부11 ... The Emissary 19 ... The Opening
20...폭감지센서 22...방사플레이트20 ... width sensor 22 ... radiation plate
25...스트립 30...실린더25 ... strip 30 ... cylinder
상기 목적을 달성하기 위한 기술적인 구성으로서 본 발명은, 냉연강판이 도금조와, 합금화 열처리로를 통과한후 냉각대를 통과하여 열처리되는 아연도금강판의 제조장치에 있어서,The present invention as a technical configuration for achieving the above object, in the apparatus for producing a galvanized steel sheet in which a cold rolled steel sheet is passed through a plating bath, an alloying heat treatment furnace, and then heat treated by passing through a cooling zone,
상기 열처리로 내에서 스트립을 가열시키는 위하여 코크스관및 공기배관이 연결되는 방사관이 내화벽돌의 일측에 설치되고, 상기 방사관에 접촉토록 열처리로의 내측에 방사플레이트가 설치되며, 상기 열처리로의 상측에 형성되는 개구부에 외기를 차단토록 실링 플레이트가 설치되는 아연도금 강판의 열처리장치를 마련함에 의한다.In order to heat the strip in the heat treatment furnace, a coke pipe and a radiating pipe connected to the air pipe are installed on one side of the refractory brick, and a spinning plate is installed inside the heat treatment furnace so as to contact the radiating pipe, By providing a heat treatment apparatus of a galvanized steel sheet in which a sealing plate is installed to block outside air in the opening formed in the upper side.
또한, 도금조를 통과한 스트립을 방사관이 설치되는 열처리로에 투입하는 단계;In addition, the step of passing the strip passing through the plating bath into the heat treatment furnace is installed a radiation tube;
상기 열처리로에 투입되는 냉연소지강판을 열처리토록 복사관의 버너에 1:3.7~5.5의 홉합비와 400~1000 Nm3/Hr의 압력으로 연료를 투입한후 방사관의 일측에 접촉되는 방사플레이트를 통하여 간접 방사하는 단계;Radiating plate which is in contact with one side of the radiating tube after fuel is injected into the burner of the radiating tube to the heat treatment of the cold-rolled steel sheet introduced into the heat treatment furnace at a hop ratio of 1: 3.7 to 5.5 and a pressure of 400 to 1000 Nm 3 / Hr. Indirectly radiating through;
상기 열처리가 완료된 아연도금강판을 배출하는 단계를 포함하는 구성으로 이루어진 아연도금 강판의 열처리방법을 마련함에 의한다.By providing a heat treatment method of the galvanized steel sheet consisting of a step comprising discharging the galvanized steel sheet is completed the heat treatment.
이하, 첨부된 도면에 의거하여 본 발명의 실시예를 상세하게 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도3은 본 발명에 따른 아연도금 강판의 열처로를 도시한 개략도이고, 도4는 본 발명에 따른 열처리로의 방사관 작동상태를 도시한 개략도이며,도5는 본 발명에 따른 열처리로를 도시한 단면구조도 본 발명은, 도금조를 통과한 스트립(25)을 열처리토록 스트립라인 상에 다수의 내화벽돌(9)이 조적되어 형성되는 내측에 일정공간을 갖는 열처리로(4)가 설치된다.Figure 3 is a schematic diagram showing the heat treatment of the galvanized steel sheet according to the present invention, Figure 4 is a schematic diagram showing the operating state of the radiation tube of the heat treatment furnace according to the present invention, Figure 5 shows a heat treatment furnace according to the present invention One Cross-sectional Structure In the present invention, a heat treatment furnace 4 having a predetermined space is provided inside a plurality of refractory bricks 9 formed on a strip line to heat-treat the strip 25 passing through the plating bath. .
상기 내화벽돌(9)의 내측으로 통과되는 스트립(25)을 가열토록 내화벽돌(9)의 내측에 방사관(11)이 설치되고, 상기 방사관(11)의 내측에 코크스관(12)및 공기배관(13)이 연결되는 버너(14)가 삽입되고, 공기배관(13)의 공기는 흡입펌프(15)를 통하여 흡입되어 예열기(40)를 통과한후 버너(14)에 공급토록 설치된다.The radiating tube 11 is installed inside the refractory brick 9 so that the strip 25 passing inside the refractory brick 9 is heated, and the coke tube 12 is provided inside the radiating tube 11. The burner 14 to which the air pipe 13 is connected is inserted, and the air of the air pipe 13 is sucked through the suction pump 15, passes through the preheater 40, and is installed to be supplied to the burner 14. .
그리고, 상기 방사관(11)의 내측면에 접촉토록 스테인레스 재질의 방사플레이트(22)가 설치되며, 상기 열처리로(4)의 상측에 개구부(19)가 형성되어 이에 실린더(30)로서 동작하는 실링플레이트(10)가 각각 설치된다.In addition, a stainless steel radiation plate 22 is installed on the inner surface of the radiation tube 11, and an opening 19 is formed above the heat treatment furnace 4 to operate as a cylinder 30. The sealing plate 10 is installed, respectively.
또한, 상기 열처리로(4)의 내측에 투입되는 스트립(25)의 폭을 감지토록 감지센서(20)가 설치되고, 상기 열처리로(4)의 일측에 도어(21)가 설치되는 구성으로 이루어 진다.In addition, the sensor 20 is installed to detect the width of the strip 25 is introduced into the inside of the heat treatment furnace 4, the door 21 is formed on one side of the heat treatment furnace (4) Lose.
이와같은 구성으로 이루어진 본 발명의 작용을 설명하면 다음과 같다.Referring to the operation of the present invention made of such a configuration as follows.
도3 내지 도5에 도시한 바와같이, 도금조에서 에어나이프의 에어압에 의해 도금량을 제어한후 합금화 열처리로(4)의 내측에 스트립(25)을 통과시킨다.As shown in Figs. 3 to 5, the plating amount is controlled by the air pressure of the air knife in the plating bath, and then the strip 25 is passed inside the alloy heat treatment furnace 4.
이때, 상기 열처리로(4)의 내부는 내화벽돌(9)로 축조되어 단열토록 하였으며, 내화벽돌(9)은 스테인레스 재질의 방사플레이트(22)로서 그 표면을 커버링토록 하고, 상기 방사플레이트(22)의 내측으로 밀착토록 방사관(11)이 내장되어 방사관(11)의 열기에 의해 합금화 열처리로(4)의 온도가 스트립(25)에 간접전달토록 된다.At this time, the inside of the heat treatment furnace (4) was built by the refractory brick (9) to be insulated, the refractory brick (9) is a stainless steel spinning plate 22 to cover the surface, the spinning plate 22 The inner side of the radiation tube 11 is in close contact with the inside) so that the temperature of the alloying heat treatment furnace 4 is indirectly transmitted to the strip 25 by the heat of the radiation tube 11.
상기 방사관(11)의 내부는 코크스관(12)과 공기배관(13)을 통한 혼합연료에 의해 동작되는 버너(14)로서 화염을 발생시키고, 상기 화염은 방사관(11)의 내부를 순환하면서 열전달을 수행하고, 스택을 통하여 폐열이 방출토록 한다.The inside of the radiating tube 11 generates a flame as a burner 14 operated by the mixed fuel through the coke tube 12 and the air pipe 13, the flame circulates inside the radiating tube 11 Heat transfer is carried out, and waste heat is released through the stack.
상기 방사관(11)의 열에 의해 합금화 열처리 된후 스트립(25)은 합금화 열처리로(4) 상부에 형성되는 개구부(19)를 통과하여 배출하게 되고, 이때 스트립(25)의 폭 대비 개구부(19) 폭의 갭이 스테인레스 재질로서 실린더(30)에 의해 양측으로 이동가능토록 설치되는 실링 플레이트(10)에 의해 조절토록 되어 스트립(25)의중심부와 에지부의 온도 편차를 10℃내로 조절토록 하였다.After the alloy heat treatment by the heat of the radiating tube 11, the strip 25 is discharged through the opening 19 formed on the alloy heat treatment furnace 4, the opening 19 compared to the width of the strip 25 The gap of the width was made of a stainless steel material to be adjusted by the sealing plate 10 installed to be movable to both sides by the cylinder 30 to adjust the temperature deviation of the center portion and the edge portion of the strip 25 within 10 ° C.
이를 구체적으로 살펴보면, 합금화 열처리로(4) 내부는 스테인레스 제질의 방사플레이트(22)로 커버링하여 복사열에 의해 온도 확보가 유리함은 물론 내화벽돌(9)이 하부로 낙하하는 것을 방지하였다.In detail, the inside of the alloy heat treatment furnace 4 is covered with a stainless steel spinning plate 22 to secure the temperature by radiant heat as well as to prevent the refractory brick 9 from falling down.
또한, 상기 합급화 열처리로(4) 일측면에는 열처리로(4)의 내부수리등을 가능토록 도어(21)를 회전에 의해 밀폐토록 설치하였으며, 상기 열처리로(4) 내부에 설치되는 가열장치는 인코넬 재질의 방사관(11)을 사용하였고, 상기 버너(14)에 의한 방사관(11)의 가열시 그 열기에 열처리로(4)의 스트립에 방사플레이트(22)를 통하여 간접전달토록 설치된다.In addition, the side of the alloying heat treatment furnace (4) was installed to seal the door 21 by rotation so as to enable the internal repair, etc. of the heat treatment furnace (4), the heating device installed inside the heat treatment furnace (4) The Inconel radiator tube 11 was used, and indirectly installed through the radiating plate 22 on the strip of the heat treatment furnace 4 at its heat when the radiator tube 11 was heated by the burner 14. do.
그리고, 상기 스트립(25)을 열처리 하는 동안에 열처리로(4) 상부에 형성되는 개구부(19)를 스트립(25)이 통과하게 되는데 강판폭 대비 개구부 폭의 갭이 최소화 되도록 스테인레스 재질의 실링 플레이트(10)를 설치하고, 상기 실링 플레이트(10)는 강판 에지부의 폭을 감지하는 폭감지 센서(20)에 의해 폭이 감지되면 실링 플레이트(10)가 에어실린더에 의해 좌우로 이동되어 강판폭에 근접토록 되며, 상기 동작에 의해 강판 중심부와 에지부의 온도편차가 일정(10℃)하게 유지된다.In addition, the strip 25 passes through the opening 19 formed on the heat treatment furnace 4 during the heat treatment of the strip 25. When the width is detected by the width sensor 20 for detecting the width of the steel sheet edge portion, the sealing plate 10 is moved left and right by an air cylinder to approach the steel plate width By this operation, the temperature deviation of the steel sheet center and the edge portion is kept constant (10 ° C).
계속하여, 상기 버너(14)에 공급되는 코크스와 공기는 코크스관(12)의 일측에 압력계와 유량계가 각각 설치되어 적정온도를 제어하도록 하고, 상기 온도의 감지는 열처리로(4) 내부에 내부에 감지센서(미도시)가 설치되어 감지하게 된다.Subsequently, the coke and air supplied to the burner 14 are each provided with a pressure gauge and a flow meter on one side of the coke pipe 12 to control the appropriate temperature, the detection of the temperature is inside the heat treatment furnace (4) A detection sensor (not shown) is installed on the detection.
이때, 상기 코크스와 공기는 투입량은 아래와 같은 수학식에 의해 산정토록 한다.At this time, the coke and the air is to be calculated by the following equation.
F(에어): 소요 에어유량, F(COG): 현 COG 유량F (Air): Required Air Flow, F (COG): Current COG Flow
F(COG): 소요 COG 유량, F(에어): 현 에어유량F (COG): Required COG Flow, F (Air): Current Air Flow
본 발명의 실시예를 보다 상세하게 설명한다.Embodiments of the present invention will be described in more detail.
본 발명에서는, 소지강판에 아연도금을 수행한후 550℃의 온도로 약 12초 동안 합금화 반응을 수행하였고, 합금화 열처리 방법은 열처리로(4)의 내부에 내장설치되면서 코크스가스와 공기를 배관을 통하여 공급하는 방사관(11)의 버너(14)를 점화시켜 스트립(25)의 폭방향으로 균일한 열처리를 수행하고, 이때 코크스 공급유량은 400~1000 Nm3/Hr, 에어공급유량은 2000~5000 Nm3/Hr 로 하여 스트립에 접촉되는 온도를 일정하게 유지시켰다.In the present invention, after performing the galvanized steel sheet to the alloying reaction for about 12 seconds at a temperature of 550 ℃, the alloying heat treatment method is installed inside the heat treatment furnace (4) while piping the coke gas and air piping Ignite the burner 14 of the radiating tube 11 to be supplied through to perform a uniform heat treatment in the width direction of the strip 25, wherein the coke supply flow rate is 400 ~ 1000 Nm 3 / Hr, the air supply flow rate is 2000 ~ The temperature of contact with the strip was kept constant at 5000 Nm 3 / Hr.
즉, 연료와 에어의 혼합비를 1:3.8~5.5의 비율로 조정토록 하였는데 이는 상기 비율에서 에어가 부족하거나 초과되면 열량부족및 불완전 연소로 이어지는 문제점이 발생된다.That is, the mixing ratio of fuel and air is adjusted to a ratio of 1: 3.8 to 5.5, which causes a problem of insufficient calorie and incomplete combustion when air is insufficient or exceeded in the ratio.
그리고, 상기 상부 개구부(19)에는 스테인레스 재질의 판재(두께 약 15㎜)를 사용하고, 에어실린더(30)및 강판의 에지부 감지센서(20)에 의해 스트립(25)과 실링 플레이트(10) 사이의 간격을 항상 50㎜ 이내로 유지토록 한다.In addition, a stainless steel plate (about 15 mm in thickness) is used for the upper opening 19, and the strip 25 and the sealing plate 10 are formed by the air cylinder 30 and the edge detection sensor 20 of the steel sheet. The distance between them should be kept within 50mm at all times.
상기와 같은 조건에 의해 제조된 합금화 용융아연도금강판에 대한 내파우더랑성, 가공성, 합금화도 편차를 측정하면 표1과 같이 나타난다.The powder resistance, workability, and alloying degree deviation of the alloyed hot-dip galvanized steel sheet manufactured by the above conditions are shown in Table 1.
품질평가 : 1(우수) ~ 5(불량)Quality evaluation: 1 (excellent) ~ 5 (bad)
이때, 상기 내파우더링성은 제조된 스트립의 표면에 테이프를 붙이고 180도 굽힙시험을 실시한후 테이프에 묻어나온 도금 분말량을 측정하여 평가하였으며, 합금화도 편차는 도금층의 철함량을 습식분석하여 강판 폭방향 펄함량을 비교하였고, 가공성은 만능시험기에 의하여 연신량을 구하는데 걸리는 힘의 세기로 측정하였다.At this time, the powder resistance was evaluated by measuring the amount of plating powder buried in the tape after applying a tape to the surface of the prepared strip 180 degree bend test, the alloying degree deviation was wet analysis of the iron content of the plating layer width of the steel sheet Aroma pearl content was compared, and workability was measured by the strength of the force required to obtain the draw amount by a universal testing machine.
표1에서와 같이 직접가열식은, 스트립 폭방향으로 온도편차가 심하여 합금화상태도 불균일하게 되어 가공성이 나쁘게 되었으며, 비교예의 2,3의 경우에도 간접가열 방식을 채택하였음에도 연료와 공기비가 적절하지 못하여 불완전 연소및 열량 부족현상이 나타나 합금화품질및, 연소효율및 가공성등에서 전체적으로 저하되는 현상이 발생하였다.As shown in Table 1, the direct heating type has a severe temperature deviation in the strip width direction, resulting in uneven alloying conditions, resulting in poor workability. In the case of Comparative Examples 2 and 3, the indirect heating method was used, resulting in incomplete fuel and air ratios. Combustion and caloric insufficiency occurred, resulting in overall degradation in alloying quality, combustion efficiency, and workability.
한편, 간접가열방식을 채택하면서 일정한 연료및 공기의 혼합비를 갖도록 되는 버너(14)와 상부 개구부(19)의 폭을 조정토록 설치되는 실링 플레이트(10)에 의해 스트립의 폭방향으로 균일하게 가열되어 폭방향으로 합금화 편차가 적어 내 파우더랑서으 가공성등 전체적으로 우수한 합금화 품질이 확보되는 것일 알수 있다.On the other hand, by adopting an indirect heating method while being uniformly heated in the width direction of the strip by the sealing plate 10 installed to adjust the width of the burner 14 and the upper opening 19 to have a constant fuel and air mixing ratio. It can be seen that the alloying variation is small in the width direction, and the overall alloying quality such as powder resistance and workability is ensured.
특히, 본발명의 상부 개구부(19)에 이동토록 설치되는 실링 플레이트(10)에 의해 외기의 유입이 최소화 되어 외기의 유입에 따른 온도 간섭이 배제되어 더욱 균일한 합금화도의 확보가 가능토록 되는 것이다.In particular, the inflow of outside air is minimized by the sealing plate 10 installed to move in the upper opening 19 of the present invention, thereby eliminating temperature interference due to the inflow of outside air, thereby ensuring a more uniform alloying degree. .
이상과 같이 본 발명에 따른 아연도금 강판의 열처리방법 및 장치에 의하면, 용융아연도금강판을 합금화 열처리로 내부로 통과시킬때 방사관을 열처리로 측벽에 위치토록 한후 방사관 내부에 버너를 삽입토록 하는 간접가열 방식에 의해 과합금화를 방지하여 합금화의 균일도를 향상시키며, 강판폭에 따라 실링이 가능토록 하여 도금층의 과합금화를 방지하여 내 파우더링성 뿐만 아니라 합금화의 균일정도및 가공특성을 극대화 하여 제품의 신뢰성을 향상토록 하는 등의 우수한 효과가 있다.As described above, according to the heat treatment method and apparatus for galvanized steel sheet according to the present invention, when passing the hot-dip galvanized steel sheet into the alloy heat treatment furnace, the radiator tube is positioned on the side wall of the heat treatment furnace, and then the burner is inserted into the radiation tube. Indirect heating method prevents over alloying to improve the uniformity of alloying. Sealing is possible according to the width of steel plate to prevent over alloying of the plating layer, thereby maximizing the powdering resistance as well as the uniformity and processing characteristics of the alloying. There is an excellent effect such as to improve the reliability.
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| KR100478089B1 (en) | 2005-03-24 |
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