KR20170010794A - Method for producing hot-plated product by hot rolling, direct cold rolling without pickling, and reduction annealing - Google Patents

Method for producing hot-plated product by hot rolling, direct cold rolling without pickling, and reduction annealing Download PDF

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KR20170010794A
KR20170010794A KR1020167034949A KR20167034949A KR20170010794A KR 20170010794 A KR20170010794 A KR 20170010794A KR 1020167034949 A KR1020167034949 A KR 1020167034949A KR 20167034949 A KR20167034949 A KR 20167034949A KR 20170010794 A KR20170010794 A KR 20170010794A
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hot
rolling
temperature
scale
cold
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KR102337241B1 (en
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준 리
닝 탄
칭끄 멩
추앙 ?
추앙 „œ
량첸 쉬
샤오밍 허
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바오샨 아이론 앤 스틸 유한공사
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or 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
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    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
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    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
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    • 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
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    • 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
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    • C23C2/0224—Two or more thermal pretreatments
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    • 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
    • C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
    • 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
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Abstract

본 발명은 열연 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법에 관한 것으로, 강판이 조압연, 사상압연, 냉각, 코일링을 거치고, 출탕온도를 낮추고 압연속도를 높임으로써 스케일 두께를 감소시키는 동시에 압연 후의 냉각속도와 코일링온도를 제어하는 열연단계; 압연압력, 장력, 변형률 및 압연패스횟수 등 냉연 공정 매개변수를 최적화하는 것을 통해, 적절한 압연 윤활액을 사용하여 스케일이 냉연과정에서 베이스에 따라 양호한 소성 변형이 발생되나 스폴링 및 스티킹 등 현상이 발생하지 않도록 하는 냉연 단계; 500~1000℃ 조건에서 60~300s 환원시키고 환원성 가스를 통입시켜 스케일을 철저하게 환원시키며, 띠강이 아연욕으로 진입하는 온도까지 냉각시키는 환원 어닐링 단계; 및 환원 어닐링 후 직접 아연욕으로 진입시키고 몇 초간 체류시켜 용융아연도금을 완성하는 용융도금 단계를 포함한다. 본 발명은 산세 및 관련 공정을 생략할 수 있고, 과정이 짧고 효율이 높으며 원가가 낮은 친환경형 용융도금 제품의 생산을 실현할 수 있다. The present invention relates to a method for producing a hot-rolled steel sheet direct cold-reduced annealing hot-dip galvanized product, in which a steel sheet undergoes rough rolling, finishing rolling, cooling and coiling, lowering the hot water temperature and increasing the rolling speed, A hot rolling step of controlling the cooling rate and the coiling temperature after rolling; By optimizing the cold rolling process parameters such as rolling pressure, tension, strain and rolling pass number, good plastic deformation occurs on the scale during the cold rolling process using appropriate rolling lubricant, but spalling and sticking occur A cold-rolling step to prevent it; A reducing annealing step of reducing the scale to 60 to 300s at a temperature of 500 to 1000 ° C, reducing the scale thoroughly by introducing a reducing gas, and cooling the strip to a temperature at which the strip enters the zinc bath; And a hot dip galvanizing step of directly entering the zinc bath after the reduction annealing and staying for a few seconds to complete hot dip galvanizing. The present invention can realize the production of environmentally friendly hot-dip galvanized products which can omit pickling and related processes, and which are short in process, high in efficiency and low in cost.

Figure P1020167034949
Figure P1020167034949

Description

열연 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법{METHOD FOR PRODUCING HOT-PLATED PRODUCT BY HOT ROLLING, DIRECT COLD ROLLING WITHOUT PICKLING, AND REDUCTION ANNEALING}METHOD FOR PRODUCING HOT-PLATED PRODUCT BY HOT ROLLING, DIRECT COLD ROLLING WITH OUT PICKLING, AND REDUCTION ANNEALING [0002]

본 발명은 용융도금 제품의 생산방법에 관한 것으로, 구체적으로 열연 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법에 관한 것이다.The present invention relates to a method for producing a hot-dip galvanized product, and more particularly, to a method for producing a hot-rolled, direct cold-reduced annealed hot-dip galvanized product.

지금까지의 냉연 용융아연도금 제품의 생산에 의하면, 열연판이 우선 산세 압연 유닛을 거쳐 열연판 표면의 스케일을 제거하고, 적절한 두께로 냉연 변형시키며, 용융도금 시에 먼저 알칼리 세정 탈지하고, 환원 어닐링한 후 용융아연도금을 완성한다. 이러한 전통적인 용융아연도금 제품은 생산 공정 과정이 길고 생산효율이 낮으며, 또한 산세 공정에 따른 환경오염 문제도 심각해 강철기업이 에너지절감 및 친환경 면에서의 최대 걸림돌로 되고 있다. 한편, 산세 과정에서 대량의 철산화물을 제거함에 따른 제품 수율이 낮고, 강부식성 산이 생산장비에 대한 요구 및 폐산 처리 등 과정은 생산 및 유지보수의 원가 상승을 초래한다. 따라서, 무산세의 용융아연도금 제품 및 생산 공정을 개발하는 것, 즉 산세 공정을 생략하는 것은 항상 박슬래브 생산 기업의 소원이며 강철기업의 지속적인 발전에 있어서 중요한 의의가 있다.According to the production of the cold-rolled hot-dip galvanized products so far, the hot-rolled sheet first passes through the pickling rolling unit to remove the scale of the hot-rolled sheet surface and cold-deform it to an appropriate thickness, Finish hot dip galvanizing. These traditional hot-dip galvanized products have long production processes, low production efficiency, and environmental pollution problems due to the pickling process, making steel companies the biggest obstacle to energy saving and environmental friendliness. On the other hand, the product yield due to the removal of a large amount of iron oxide in the pickling process is low, and the demand for the production equipment of heavy corrosive acid and the treatment of waste acid causes the cost of production and maintenance to increase. Therefore, the development of molten zinc galvanized products and production processes, that is, omission of the pickling process is always a wish of the thin slab production enterprise and is important for the continuous development of steel enterprises.

제US6258186B1호 및 제KR100905653B1호 특허에는 고속으로 무산세의 열연 용융아연도금 제품을 생산하는 방법에 대해 공개되어 있으며, 기본원리는 다음과 같다. 수소가스와 같은 환원성 가스를 사용하여 열연 띠강 표면의 스케일을 환원시킴으로써 산세척을 대체한다. 그러나, 스케일의 환원속도가 비교적 느려 전체 생산라인의 운행에 영향을 미친다. 환원 속도를 향상시키고 환원과 아연도금의 속도 매칭을 실현하기 위하여, 해당 특허에서는 열연 띠강 코일링 과정에서의 냉각속도를 제어함으로써 산화물 중의 산화철 함량이 20% 이상으로 되도록 향상시킨다. 산화철은 쉽게 환원되지만, 효과가 매우 한정적이어서, 환원속도 및 효율은 여전히 전체 기술의 발전을 제약하고 있기 때문이다.US Patent No. 6,258,186B1 and No. KR100905653B1 disclose a method of producing hot-dip galvanized products of high-speed hot-dip galvanizing, and the basic principle is as follows. By using a reducing gas such as hydrogen gas to reduce the scale of the hot rolled steel surface, acid washing is replaced. However, the scale reduction rate is relatively slow, affecting the operation of the entire production line. In order to improve the reduction rate and realize the speed matching of reduction and galvanization, the patent teaches that the iron oxide content in the oxide is improved to 20% or more by controlling the cooling rate in the hot strip steel coiling process. Iron oxide is easily reduced, but the effect is very limited, because the reduction rate and efficiency still limit the development of the entire technology.

열연판 표면 스케일의 사용 성능에 대한 연구에서, 일본 특허 제06-033449호에는 "Tight Scale" 강판에 대해 공개되었고, 해당 강판 표면의 스케일은 주로 Fe3O4로 구성되는 바, 이는 구조가 치밀하여 후속 심층가공 변형과정에서 스케일은 강판과 함께 변형되어 박리되지 않아, 사용자의 스케일 그대로의 사용 요구를 만족시키고, 후속의 스케일을 구비하는 냉연과는 관련되지 않는다. 중국특허 출원번호 제201010235928.X호, 제201010298939.2호, 제200710010183.5호, 제201010010116.5호, 제201010209526.2호, 제201010189410.7호와 제200510047958.7호에는 무산세 자동차 프레임용 강의 생산방법에 대해 공개되어 있으며, 이는 모두 열연 공정 과정을 제어함으로써 열연판 표면의 스케일이 주로 Fe3O4로 구성되도록 한다. 상기 특허는 모두 스케일을 구비하는 열연판의 직접적인 사용에 관한 것으로, 스케일을 구비하는 열연판의 변형이 발생되는 경우는 만곡으로서, 냉연 변형과 무관하고, 후속의 용융아연도금 또는 기타 합금의 용융도금과도 관련이 없다. In a study on the use performance of the hot-rolled plate surface scale, Japanese Patent No. 06-033449 discloses a "Tight Scale" steel sheet, and the scale of the steel sheet surface is mainly composed of Fe 3 O 4 , So that the scale is not deformed and peeled together with the steel sheet in the subsequent deep processing deformation process, so that it meets the demand of the user as it is at the scale, and is not related to the cold rolling with the subsequent scale. The production methods of steel for automobile frames are disclosed in Chinese Patent Application Nos. 201010235928.X, 201010235928.X, 201010298939.2, 200710010183.5, 201010010116.5, 201010209526.2, 201010189410.7 and 200510047958.7, By controlling the hot rolling process, the scale of the hot-rolled sheet surface is made mainly of Fe 3 O 4 . All of the above patents relate to direct use of a hot-rolled steel sheet having a scale. When a deformation of a hot-rolled steel sheet having scale is generated, the steel sheet has curvature irrespective of the cold-rolling deformation and is subjected to subsequent hot-dip galvanizing or hot- There is no connection.

본 발명은 전통적인 용융아연도금 공정의 단점에 대해, 열연 및 냉연 후 직접 환원시키고 다시 용융도금하는 것을 통해, 산세척 및 관련 공정을 생략할 수 있고, 과정이 짧고 효율이 높으며 원가가 낮은 친환경형 용융도금 제품의 생산을 실현할 수 있는 열연 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법을 제공하는 것을 목적으로 한다. 한편, 열연판 표면의 스케일 구조는 주로 Fe3O4 및 FeO를 위주로 하고, 스케일의 두께는 비교적 얇아, 스케일을 구비한 냉연을 통해 용융도금 등 관련 공정을 진행한다. The present invention overcomes the disadvantages of conventional hot dip galvanizing processes by eliminating pickling and related processes through direct reduction and hot dip galvanizing after hot rolling and cold rolling to provide a process that is short, The present invention provides a method for producing hot-rolled, three-sided, direct cold-reduced, annealed, and hot-dip galvanized products capable of realizing the production of a plated product. On the other hand, the scale structure of the hot-rolled plate surface is mainly composed of Fe 3 O 4 and FeO, and the thickness of the scale is relatively thin, and related processes such as hot-dip coating are performed through cold rolling with scale.

본 발명의 열연 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법은, The method for producing a hot-rolled, three-sided direct cold-reduced annealing hot-

슬래브에 대하여 인을 제거한 후, 순차적으로 조압연기의 조압연, 사상압연기의 사상압연, 냉각장치의 냉각, 권취기의 코일링을 거치고, 출탕온도를 낮추고 압연속도를 높임으로써 스케일 두께를 감소시키는 동시에 압연 후의 냉각속도와 코일링온도를 제어하여 열연판 표면 스케일구조를 제어하며, 스케일 부착력을 향상시키고 스케일 두께를 감소시키는, 열연 유닛을 통해 열연하는 단계;After removing the phosphorus from the slab, the scale thickness is reduced by sequentially performing rough rolling of the roughing mill, finishing of the finishing mill, cooling of the cooling apparatus, coiling of the coiling machine, lowering the temperature of the hot water and increasing the rolling speed Hot rolling through a hot rolling unit, controlling the cooling rate and the coiling temperature after rolling to control the hot-rolled plate surface scale structure, improving the scale adhesion, and reducing the scale thickness;

압연압력, 장력, 변형률 및 압연패스횟수를 포함하는 냉연 공정 매개변수를 최적화하고 압연 윤활액을 사용하여 스케일이 냉연과정에서 베이스에 따라 양호한 소성 변형이 발생되도록 함으로써 높은 표면품질 및 판 형상의 스케일판을 수득하는, 냉연 유닛을 통해 냉연하는 단계;By optimizing the cold rolling process parameters, including rolling pressure, tension, strain and rolling pass frequency, and using a rolling lubricant, a good plastic deformation along the base can be generated during the cold rolling of the scale, Cold rolling through a cold-rolling unit;

환원성 가스를 통입시키고 환원온도 및 시간을 제어하며, 스케일을 철저하게 환원시키고 띠강이 아연욕으로 진입하는 온도까지 냉각시키는, 환원로를 통해 환원 어닐링하는 단계; 및 Performing a reduction annealing through a reducing furnace to reduce the temperature and time of the reducing gas, thoroughly reducing the scale, and cooling the strip to a temperature at which the strip enters the zinc bath; And

환원 어닐링 후 직접 아연욕으로 진입하고 몇 초간 체류시켜 용융도금을 완성하는, 용융도금 단계를 포함한다. And a hot dip galvanizing step of directly entering the zinc bath after the reduction annealing and staying for several seconds to complete the hot dip coating.

탈지세정장치에서 알칼리성 탈지제를 사용하여 냉연 과정에서 표면에 잔류된 기름때 및 분진을 제거하고, 세정 및 건조시키는, 냉연 단계 후의 탈지단계를 더 포함한다. And a degreasing step after the cold rolling step in which the oil mist and dust remaining on the surface are removed, cleaned and dried by using an alkaline degreasing agent in the degreasing and scouring apparatus.

열연단계에서, 출탕온도는 1100~1250℃이고, 압연 마감온도는 800~900℃이며, 코일링온도는 550~600℃ 사이이고, 압연속도는 8~20m/s이며, 압연 후 냉각속도는 7~30℃/s이다.In the hot rolling step, the tapping temperature is 1100 to 1250 占 폚, the rolling finishing temperature is 800 to 900 占 폚, the coiling temperature is 550 to 600 占 폚, the rolling speed is 8 to 20 m / s, Lt; 0 > C / s.

상기 출탕온도는 1150~1200℃이고, 압연 마감온도는 840~870℃이며, 코일링온도는 550~570℃이고, 압연속도는 14~18m/s이며, 냉각속도는 14~18℃/s이다.The hot water temperature is 1150 to 1200 캜, the rolling finishing temperature is 840 to 870 캜, the coiling temperature is 550 to 570 캜, the rolling speed is 14 to 18 m / s, and the cooling rate is 14 to 18 캜 / s .

상기 출탕온도는 1170~1200℃이고, 압연 마감온도는 850℃ 또는 860℃이며, 코일링온도는 550℃ 또는 560℃이고, 압연속도는 17m/s 또는 18m/s이며, 냉각속도는 19℃/s 또는 20℃/s이다.The rolling temperature is 1170 to 1200 ° C, the rolling finishing temperature is 850 ° C or 860 ° C, the coiling temperature is 550 ° C or 560 ° C, the rolling speed is 17m / s or 18m / s, s or 20 ° C / s.

열연단계에서, 수득한 열연판 두께는 1.0~6mm이고, 열연판 표면 스케일의 평균 두께는 5~10㎛이며, 스케일구조는 Fe3O4 및 FeO를 위주로 하고, 여기서 Fe3O4의 중량함량은 50% 이상을 차지한다.In the hot rolling step, the resulting hot-rolled sheet thickness is 1.0 ~ 6mm, and the hot-rolled steel sheet average thickness of the surface scale is 5 ~ 10㎛, the scale structure is Fe 3 O 4 and FeO and the focusing, where the weight percentage of Fe 3 O 4 Account for more than 50%.

상기 열연판 두께는 1.5~4mm이고, 상기 Fe3O4의 함량은 65% 이상을 차지한다.The thickness of the hot rolled sheet is 1.5 to 4 mm, and the content of Fe 3 O 4 accounts for 65% or more.

냉연단계에서, 압연패스는 1~2회 내에 완성되고, 매차례 변형률은 1.0%~90%로 제어한다.In the cold rolling step, the rolling pass is completed within one to two times, and the strain is controlled to be 1.0% to 90% each time.

상기 압연패스는 1회 내에 완성되고, 변형률은 50%~80%로 제어한다.The rolling pass is completed within one time, and the strain is controlled to 50% to 80%.

냉연단계에서, 압연 유화액은 탈이온수 또는 팜유를 사용하고, 냉연 압하율은 1.0%~90%이다.In the cold rolling step, deionized water or palm oil is used as the rolling emulsion, and the cold rolling reduction rate is 1.0% to 90%.

상기 냉연 압하율은 50%~80%이다.The cold rolling reduction ratio is 50% to 80%.

환원 어닐링 단계에서, 환원온도는 500~1000℃이고, 환원시간은 60~300s이며, 환원성 가스는 H2 또는 CO와 불활성가스의 혼합물이고, 여기서 H2 또는 CO의 농도는 3% 이상이다.In the reduction annealing step, the reduction temperature is 500 to 1000 ° C., the reduction time is 60 to 300 s, and the reducing gas is a mixture of H 2 or CO and an inert gas, wherein the concentration of H 2 or CO is 3% or more.

상기의 환원온도는 750~950℃이고, 체류시간은 120~300s이며, H2 또는 CO의 농도는 10%~75%이다.The reduction temperature is 750 to 950 캜, the residence time is 120 to 300 s, and the concentration of H 2 or CO is 10% to 75%.

상기의 환원온도는 800℃, 850℃ 또는 900℃이고, 체류시간은 180s, 240s 또는 300s이며, H2 또는 CO의 농도는 15%, 25% 또는 30%이다.The reduction temperature is 800 캜, 850 캜 or 900 캜, the retention time is 180s, 240s or 300s, and the concentration of H 2 or CO is 15%, 25% or 30%.

환원 어닐링 단계에서, 반응에 참여하지 않은 H2 또는 CO는 순환 사용된다.In the reductive annealing step, H 2 or CO not participating in the reaction is cycled.

용융도금 코팅 단계에서, 수득한 용융도금제품은 용융순수아연도금, 용융아연알루미늄마그네슘도금, 용융알루미늄아연도금 또는 용융알루미늄규소도금 제품을 포함한다.In the hot-dip coating step, the hot-dip product obtained includes hot-dip galvanizing, hot-dip zinc-aluminum magnesium plating, hot-dip galvanized or hot-dip galvanized products.

본 발명의 열연 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법은 전통적인 공정에 비하여 산세 유닛을 생략하였고, 과정이 짧고 효율이 높은 공정으로서 실제 수요를 만족시킬 수 있는 성능을 구비한다. 또한, 전통적인 아연도금기술에 비하여, 산세척으로 스케일을 제거할 필요가 없으므로 염산, 황산과 같은 그 어떠한 부식성 매질과도 관련되지 않아 근본적으로 산세척에 따른 환경오염 문제를 해결하였다. 또한, 본 발명은 상이한 두께 규격의 용융도금 제품을 수득할 수 있고, 특히 두꺼운 규격의 용융아연도금 제품을 수득할 수 있다. 또한, 수득한 제품은 표면 품질에 대한 요구가 높지 않고 내식성 및 기계적 성능에 대하여 일정한 요구가 있는 경우, 예를 들어 각종 건축용 강, 전력설비용 강, 고속도로 및 각종 교량 난간, 창고 및 공장 건물용 강 등 영역에 적합하다.The production method of the hot rolled three-dimensional direct cold rolling reduction annealing hot-dip galvanized product of the present invention omits the pickling unit compared to the conventional process, and has a process which is short and has a high efficiency and satisfies the actual demand. In addition, compared to the conventional zinc plating technique, it is not necessary to remove the scale by pickling, and thus it is not associated with any corrosive medium such as hydrochloric acid or sulfuric acid, and fundamentally solves the problem of pollution caused by pickling. Further, the present invention can obtain a hot-dip galvanized product of different thickness specifications, and in particular a hot-dip galvanized product of a thick standard can be obtained. In addition, when the product obtained is not required to have high surface quality and there is a certain demand for corrosion resistance and mechanical performance, it can be used for various construction steels, power plant steels, highways and various kinds of bridge rails, It is suitable for the back region.

도1은 본 발명의 일 실시예에 따른 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법의 공정 흐름 사시도이다.
도2는 본 발명의 응용 실시예1에 따라 수득한 열연판이 50% 냉연을 거친 후 스케일 단면 금속 현미경 사진이다.
도3은 본 발명의 응용 실시예1에 따라 수득한 열연판이 50% 냉연을 거친 후 스케일 표면 모양 사진이다.
도4는 본 발명의 응용 실시예1에 따라 수득한 아연도금판의 단면 스캔 사진이다.
도5는 본 발명의 응용 실시예1에 따라 수득한 아연도금판이 180도로 만곡된 후의 도금층 표면 사진이다.
도6은 본 발명의 응용 실시예1에 따라 수득한 아연알루미늄마그네슘 도금판의 단면 스캔이다.1 is a process flow perspective view of a method for producing a hot dip galvanized annealed hot dip galvanized product according to an embodiment of the present invention.
Fig. 2 is a photograph of a scale section metallographic microscope after hot-rolled sheet obtained according to Application Example 1 of the present invention is subjected to 50% cold rolling.
Fig. 3 is a photograph of a scale surface after a hot rolled sheet obtained according to Application Example 1 of the present invention is subjected to 50% cold rolling.
4 is a cross-sectional scan photograph of a zinc-plated plate obtained according to Application Example 1 of the present invention.
5 is a photograph of a surface of a plating layer after the galvanized sheet obtained according to Application Example 1 of the present invention is warped by 180 degrees.
6 is a cross-sectional scan of a zinc aluminum magnesium plated sheet obtained according to Application Example 1 of the present invention.

본 발명의 상기 목적, 특징 및 장점에 대한 더욱 명확한 이해를 위해, 이하 도면을 결부하여 본 발명의 구체적인 실시형태에 대해 상세하게 설명하도록 한다. 우선, 설명해야 할 것은, 본 발명은 하기 구체적인 실시형태에 한정되는 것이 아니고, 본 발명이 속하는 기술분야의 당업자는 이하 실시형태에서 구현되는 사상으로부터 본 발명을 이해해야 하며, 각 기술용어는 본 발명의 실질적인 사상을 토대로 가장 광범위하게 이해해야 한다. 도면의 동일한 부호는 동일한 부분을 표시한다. For a clearer understanding of the objects, features and advantages of the present invention, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is to be understood that the present invention is not limited to the specific embodiments described below and that those skilled in the art should understand the present invention from the spirit of the following embodiments, It should be understood most extensively based on practical ideas. Like reference numerals in the drawings denote like parts.

도1은 본 발명의 일 실시예에 따른 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법의 공정 흐름 사시도로서, 도면에 도시된 바와 같이, 해당 아연도금 제품의 생산방법은 다음과 같은 단계를 포함한다.FIG. 1 is a process flow perspective view of a method for producing a hot dip galvanized annealing hot dip galvanized product according to an embodiment of the present invention. As shown in the figure, a method of producing the galvanized product includes the following steps do.

(1) 열연 유닛을 통해 열연하는 단계: 열연판(1)에 대하여 인을 제거한 후, 순차적으로 조압연기(2)의 조압연, 사상압연기(3)의 사상압연, 냉각장치(4)의 냉각, 권취기(5)의 코일링을 거치고, 출탕온도를 낮추고 압연속도를 높임으로써 스케일 두께를 감소시키는 동시에 압연 후의 냉각속도와 코일링온도를 제어하여 열연판 표면 스케일구조를 제어하며, 스케일 부착력을 향상시켜, 비교적 얇으며 특정 스케일 구조를 구비하는 열연판을 수득한다. 이로써, 환원속도를 향상시키는데 유리할 뿐만 아니라 철저한 환원을 보장하고 또한 열연판에 스케일이 구비되어 냉연할 때 스폴링되지 않도록 하는데 유리하다.(1) Hot rolling through the hot rolling unit: After removing the phosphorus from the hot rolled plate 1, rough rolling of the roughing mill 2, finishing of the finish rolling mill 3, cooling of the cooling unit 4 , The winding temperature of the take-up machine (5) is lowered and the rolling speed is increased to thereby reduce the scale thickness and control the cooling rate and the coiling temperature after rolling to control the hot-rolled sheet surface scale structure. To obtain a hot rolled sheet having a relatively thin and specific scale structure. This is advantageous not only for improving the reduction rate, but also for ensuring thorough reduction and also preventing scalling when the cold rolled sheet is provided with a scale on the hot rolled sheet.

(2) 냉연 유닛을 통해 냉연하는 단계: 열연판은 스케일을 구비한 냉연을 진행하고, 수요에 따라 적당한 두께로 압연하며, 압연 과정에서 압연 매개변수를 조절하고, 압연압력, 장력, 변형률 및 압연패스횟수를 포함하는 냉연 공정 매개변수를 최적화하고 압연 윤활액을 사용함으로써 스케일이 냉연과정에서 베이스에 따라 양호한 소성 변형이 발생되나 스폴링, 스티킹 등 현상이 발생하지 않도록 함으로써, 높은 표면 품질 및 판 형상의 스케일판을 수득한다.(2) Cold rolling through a cold rolling unit: The hot rolled sheet is subjected to cold rolling with a scale, and is rolled to an appropriate thickness according to demand, and the rolling parameters are controlled in the rolling process. The rolling pressure, tension, By optimizing the cold rolling process parameters including the number of passes and by using the rolling lubricant, good plastic deformation is generated along the base during the cold rolling process, but the occurrence of spalling, sticking, Lt; / RTI >

(3) 탈지세정장치(6)를 통해 탈지하는 단계: 알칼리성 탈지제를 사용하여 냉연 과정에서 표면에 잔류된 기름때 및 분진을 제거하고, 세정 및 건조시킨다. 냉연 과정에서 순수(純水)를 압연액으로 사용할 때, 본 공정은 알칼리성 탈지제를 사용하지 않아도 된다.(3) Degreasing through the degreasing cleaner (6): Using an alkaline degreasing agent, the oil mist and dust remaining on the surface during the cold rolling process are removed, washed and dried. When pure water is used as a rolling liquid in the cold rolling process, the present process does not require the use of an alkaline degreasing agent.

(4) 환원로를 통해 환원 어닐링하는 단계: 환원로에 진입한 후, 가열구간(7), 균열구간(8)을 거쳐 환원성 가스를 통입시키고, 500~1000℃의 온도 및 60~300s의 시간의 이중 제어 하에, 스케일을 철저하게 환원시키고, 냉각구간(9)을 다시 거쳐 띠강이 아연욕으로 진입하는 온도까지 냉각시키며, 보통 460℃ 정도이다.(4) Reducing annealing through a reducing furnace: After entering a reducing furnace, a reducing gas is introduced through a heating section (7) and a crack section (8), and a temperature of 500 to 1000 占 폚 and a time of 60 to 300 s The scale is thoroughly reduced and the cooling zone 9 is again cooled down to a temperature at which the strip steel enters the zinc bath, usually about 460 ° C.

(5) 용융아연도금홈(10)에 진입하여 용융도금하는 단계: 환원 어닐링 후 직접 용융아연도금홈(10)(즉, 아연욕)으로 진입시키고 몇 초간 체류시켜 용융도금을 완성한다.(5) Step of entering the hot-dip galvanizing groove 10 and performing hot-dip plating: After the re-annealing, the hot-dip galvanized steel sheet is directly introduced into the hot-dip galvanizing groove 10 (i.e., zinc bath) and stays for several seconds to complete hot-dip coating.

여러 차례 반복적인 시험 및 계산을 거쳐, 상기 단계(1)에서 출탕온도를 1100~1250℃로 제어하고, 압연 마감온도는 800~900℃로 제어하며, 코일링온도는 550~600℃ 사이로 제어하고, 압연속도는 8~20m/s로 제어하며, 압연 후 냉각속도는 7~30℃/s로 제어한다. 바람직하게는, 출탕온도는 1150~1200℃이고, 압연 마감온도는 840~870℃이며, 코일링온도는 550~570℃이고, 압연속도는 14~18m/s이며, 냉각속도는 15~20℃/s이다. 더욱 바람직하게는, 출탕온도는 1170~1200℃이고, 압연 마감온도는 850℃ 또는 860℃이며, 코일링온도는 550℃ 또는 560℃이고, 압연속도는 17m/s 또는 18m/s이며, 냉각속도는 19℃/s 또는 20℃/s이다. 상기 제어를 통해 수득한 열연판의 두께는 1.0~6mm이고, 바람직하게는 1.5~4mm이며, 두께는 선행기술에 비하여 훨씬 작으며, 열연판 표면 스케일의 평균 두께는 5~10㎛(열연판 표면 스케일 평균 두께란, 열연판의 대표적인 위치, 예를 들면 헤드부, 중부, 말단부 및 가장자리부 등에 대하여, 각각의 위치에서 적어도 3개 점을 취하고, 각 점에서 측정된 스케일 두께의 총합을 측정점의 총 개수로 나눈 결과가 바로 그 평균 두께임)이다. 해당 스케일구조는 Fe3O4 및 FeO를 위주로 하고, 여기서 Fe3O4의 중량함량은 50% 이상을 차지하며, 바람직하게는 65% 이상을 차지한다. 이로써, 해당 스케일 두께를 비교적 얇아지게 하여, 환원에 유리하고, 부착력이 양호하며, 스케일을 구비한 냉연에 유리하다.After repeated repeated tests and calculations, the hot water temperature is controlled at 1100 to 1250 ° C in the step (1), the rolling finishing temperature is controlled at 800 to 900 ° C, the coil ring temperature is controlled at 550 to 600 ° C , The rolling speed is controlled at 8 to 20 m / s, and the cooling rate after rolling is controlled at 7 to 30 ° C / s. Preferably, the hot water temperature is from 1150 to 1200 캜, the rolling finishing temperature is from 840 to 870 캜, the coiling temperature is from 550 to 570 캜, the rolling speed is from 14 to 18 m / s, / s. More preferably, the hot water temperature is 1170 to 1200 ° C, the rolling finishing temperature is 850 ° C or 860 ° C, the coiling temperature is 550 ° C or 560 ° C, the rolling speed is 17m / s or 18m / s, Lt; RTI ID = 0.0 > 20 C / s. ≪ / RTI > The thickness of the hot-rolled sheet obtained through the above control is 1.0 to 6 mm, preferably 1.5 to 4 mm, and the thickness is much smaller than that of the prior art. The average thickness of the hot-rolled sheet surface scale is 5 to 10 μm The scale average thickness means at least three points at each position of a representative position of the hot rolled plate, for example, the head portion, the central portion, the distal end portion and the edge portion, and the sum of the scale thicknesses measured at each point is calculated as a total And the result obtained by dividing the number is the average thickness). The scale structure is predominantly composed of Fe 3 O 4 and FeO, wherein the weight content of Fe 3 O 4 is at least 50%, preferably at least 65%. As a result, the scale thickness is made relatively thin, which is advantageous for reduction, favorable for adhesion, and good for cold rolling with scale.

상기 단계(2)에서, 압연 유화액은 탈이온수 또는 팜유를 사용하고, 냉연 압하율은 1.0%~100%이며, 바람직하게는 냉연 압하율은 50%~80%이다. 압연패스는 1~2회 내에 완성되고, 매차례 변형률은 1.0%~100%로 제어한다. 더욱 바람직하게는, 압연패스는 1회 내에 완성되고, 변형률은 50%~80%로 제어한다.In the step (2), deionized water or palm oil is used as the rolling emulsion, and the cold rolling reduction rate is 1.0% to 100%, preferably the cold rolling reduction rate is 50% to 80%. The rolling pass is completed within one to two times, and the strain is controlled to be 1.0% to 100% each time. More preferably, the rolling pass is completed within one time, and the strain is controlled to 50% to 80%.

상기 냉연 제어를 통해, 스케일이 냉연과정에서 베이스에 따라 양호한 소성 변형이 발생되도록 하여, 높은 표면 품질 및 판 형상의 스케일판을 수득할 수 있으며, 스폴링, 스티킹 등 현상이 발생하지 않는다.Through the cold rolling control, a good plastic deformation is generated along the base during the cold rolling of the scale, so that a high-surface-quality and plate-shaped scale plate can be obtained, and no phenomenon such as spoiling or sticking occurs.

상기 단계(4)에서, 환원성 가스는 H2 또는 CO와 불활성가스의 혼합물이고, 여기서 H2 또는 CO의 농도는 3% 이상이다. 바람직하게는, 환원온도는 750~950℃이고, 체류시간은 120~300s이며, H2 또는 CO의 농도는 10%~75%이다. 더욱 바람직하게는, 환원온도는 800℃, 850℃ 또는 900℃이고, 체류시간은 180s, 240s 또는 300s이며, H2 또는 CO의 농도는 15%, 25% 또는 30%이다. In step (4), the reducing gas is a mixture of H 2 or CO and an inert gas, wherein the concentration of H 2 or CO is at least 3%. Preferably, the reduction temperature is 750 to 950 캜, the residence time is 120 to 300 s, and the concentration of H 2 or CO is 10% to 75%. More preferably, the reduction temperature is 800 DEG C, 850 DEG C or 900 DEG C, the retention time is 180s, 240s or 300s, and the concentration of H 2 or CO is 15%, 25% or 30%.

상기 단계(4)에서, 스케일이 순수철로 환원됨으로써 금속 수득율이 향상되는 동시에 환원성 가스인 H2 또는 CO가 H2O 또는 CO2로 산화되어, 환경에 대해 2차오염을 초래하지 않고, 반응에 참여하지 않은 H2 또는 CO는 순환 사용할 수 있다. In the step (4), the metal is reduced by reducing the scale to pure iron, and H 2 or CO, which is a reducing gas, is oxidized to H 2 O or CO 2 and does not cause secondary pollution to the environment, Unincorporated H 2 or CO can be recycled.

상기 단계(5)에서 수득한 용융도금제품은 용융순수아연도금, 용융아연알루미늄마그네슘도금, 용융알루미늄아연도금, 용융알루미늄규소도금 및 기타 용융합금도금 제품을 포함한다.The hot-dip product obtained in the step (5) includes molten pure zinc plating, molten zinc aluminum magnesium plating, molten aluminum zinc plating, molten aluminum silicon plating and other fused gold-plated products.

이하, 응용 실시예 및 도면과 결부하여 본 발명에 따른 열연판 무산세 직접 냉연 환원 용융아연도금의 공정기술에 대해 더 상세하게 설명하도록 한다.Hereinafter, the process technology of the hot-rolled sheet three direct cold rolling-reduced hot-dip galvanizing according to the present invention will be described in detail with reference to application examples and drawings.

실시예1Example 1

슬래브를 1200℃까지 가열시키고, 노(爐) 내에서 180min동안 체류하며, 출탕온도는 1100℃이고, 고압수로 인을 제거하며, 인을 제거한 후 조압연을 진행하고, 2차 고압수 인 제거 후 재차 사상압연을 진행하며, 사상압연의 압연 시작온도는 980℃, 압연 마감온도는 870℃이고, 코일링온도는 600℃이고, 압연속도는 20m/s이며, 압연 후의 냉각속도는 8℃/s이고, 수득한 열연판의 두께는 3.6mm이며, 표면 스케일 평균 두께는 약 8㎛이고, 여기서 Fe3O4의 함량은 적어도 50%이다. 유화액 또는 순수를 윤활제로 사용하고, 열연판에 대하여 스케일을 구비한 냉연을 직접 진행하며, 1.8mm 두께까지 냉연하고, 변형률은 50%이며, 알칼리액으로 세척(순수로 압연 윤활을 진행할 때, 알칼리 세척이 필요 없고, 단지 온수로 세척하면 됨), 및 건조시킨 후, 환원로에 진입시키고 환원온도는 1000℃, 시간은 60s, 수소가스 농도는 20%, 460℃ 정도까지 냉각시킨 후 아연욕에 진입시키고 3s 체류시켜 용융아연도금을 완성함으로써 1.8mm 정도의 용융아연도금 제품을 수득한다. The slab was heated to 1200 DEG C and stayed in the furnace for 180 minutes. The temperature of the hot water was 1100 DEG C, phosphorus was removed by high pressure water, phosphorus was removed, rough rolling was performed, The rolling finish temperature was 980 占 폚, the rolling finishing temperature was 870 占 폚, the coiling temperature was 600 占 폚, the rolling speed was 20 m / s, and the cooling rate after rolling was 8 占 폚 / s, the thickness of the obtained hot-rolled sheet is 3.6 mm, the average surface-scale thickness is about 8 μm, and the content of Fe 3 O 4 is at least 50%. Emulsion or pure water is used as a lubricant and the cold rolled steel sheet is directly subjected to cold rolling with a scale to a hot rolled sheet and cold rolled to a thickness of 1.8 mm and a strain of 50%. The steel sheet is washed with an alkaline solution After cooling to a reduction temperature of 1000 ° C., a time of 60 s, a hydrogen gas concentration of 20%, and a temperature of about 460 ° C., the reaction mixture was added to a zinc bath And the mixture is allowed to stand for 3 s to complete hot dip galvanizing, thereby obtaining a hot-dip galvanized product having a thickness of about 1.8 mm.

실시예1에서 수득한 열연판이 50% 냉연을 거친 후의 스케일 단면 금속 현미경 사진은 도2에 도시된 바와 같이, 스케일 두께가 얇아지고 비연속적으로 변하기 시작하지만, 현저한 스케일 박리 또는 기판 압입 현상이 없다. 해당 스케일 표면의 모양은 도3에 도시된 바와 같이, 산화물(즉, 스케일)은 압연방향을 따라 띠 형상으로 분포되고, 비연속적 분포로 변하기 시작한다. 실시예1에서 수득한 아연도금판의 단면 스캔 사진은 도4에 도시된 바와 같이, 스케일은 기본적으로 철저하게 환원되고, 현저한 스케일 잔류가 없으며, 수득한 아연도금판이 180도 만곡 후의 도금층 표면 사진은 도5에 도시된 바와 같이, 도금층 부착력이 양호하고, 현저한 균열 또는 아연층 박리 현상이 없다.The scale cross-section metallographic micrograph after the hot-rolled sheet obtained in Example 1 has undergone 50% cold-rolling has the scale thickness thinned and begins to change discontinuously, but there is no significant scale peeling or substrate indentation phenomenon. 3, the oxide (i.e., scale) is distributed in a band shape along the rolling direction and starts to change into a discontinuous distribution. The cross-sectional scan photograph of the zinc-plated plate obtained in Example 1 shows that the scale is fundamentally thoroughly reduced, there is no remarkable scale residue, and the obtained zinc-plated plate shows a photograph of the surface of the plated layer after the 180- As shown in Fig. 5, the plating layer adhesion is good, and there is no significant crack or zinc layer peeling phenomenon.

실시예2Example 2

슬래브를 1230℃까지 가열시키고, 노 내에서 210min동안 체류하며, 출탕온도는 1170℃이고, 고압수로 인을 제거하며, 인을 제거한 후 조압연을 진행하고, 2차 고압수 인 제거 후 재차 사상압연을 진행하며, 사상압연의 압연 시작온도는 930℃, 압연 마감온도는 850℃이고, 코일링온도는 560℃이고, 압연속도는 12m/s이며, 압연 후의 냉각속도는 20℃/s이고, 수득한 열연판의 두께는 3.05mm이며, 표면 스케일 평균 두께는 약 7㎛이고, 여기서 Fe3O4의 함량은 적어도 65%이다. 유화액 또는 순수를 윤활제로 사용하고, 열연판에 대하여 스케일을 구비한 냉연을 직접 진행하며, 2.9mm 두께까지 냉연하고, 변형률은 5%이며, 알칼리액으로 세척(순수로 압연 윤활을 진행할 때, 알칼리 세척이 필요 없고, 단지 온수로 세척하면 됨), 및 건조시킨 후, 환원로에 진입시키고 환원온도는 800℃, 시간은 180s, 수소가스 농도는 50%, 470℃ 정도까지 냉각시킨 후 아연욕에 진입시키고 5s 체류시켜 용융아연알루미늄마그네슘도금을 완성함으로써 2.90mm 두께 정도의 용융아연알루미늄마그네슘 도금제품을 수득한다. 도6은 수득한 아연알루미늄마그네슘 도금판의 단면 스캔도를 나타낸 것으로, 도금층이 연속적이고 완전하며, 스케일의 환원이 철저하며, 해당 에너지스펙트럼(EDS) 분석은 표1과 같다.The slab was heated to 1230 캜 and stayed in the furnace for 210 min. The temperature of the hot water was 1170 캜. After removing the phosphorus by high pressure water, the phosphorus was removed and rough rolling was carried out. The rolling was started at a rolling start temperature of 930 캜, a rolling finishing temperature of 850 캜, a coiling temperature of 560 캜, a rolling speed of 12 m / s, a cooling rate after rolling of 20 캜 / The resulting hot-rolled sheet had a thickness of 3.05 mm and an average surface-scale thickness of about 7 탆, wherein the content of Fe 3 O 4 was at least 65%. The cold rolled steel sheet was subjected to cold rolling with a scale to a thickness of 2.9 mm and a strain of 5%. The steel sheet was washed with an alkaline solution (when rolling with pure water, After cooling to a reduction temperature of 800 ° C., a time of 180 s, a hydrogen gas concentration of 50%, and a temperature of about 470 ° C., the solution was added to a zinc bath And the molten zinc aluminum magnesium plating was completed by allowing it to stand for 5 seconds to obtain a hot-dip galvanized magnesium magnesium plating product having a thickness of about 2.90 mm. FIG. 6 shows a cross-sectional scan of the obtained zinc-aluminum-magnesium-plated sheet. The plating layer is continuous and complete, the scale reduction is thorough, and the corresponding energy spectrum (EDS) analysis is shown in Table 1.

표1 에너지스펙트럼 분석Table 1 Energy spectrum analysis

에너지스펙트럼 번호Energy spectrum number 데이터 통계Data statistics CC FeFe ZnZn TotalTotal 에너지스펙트럼1Energy spectrum 1 예Yes 6.226.22 90.5290.52 3.263.26 100.00100.00 에너지스펙트럼2Energy spectrum 2 예Yes 5.055.05 93.0493.04 1.911.91 100.00100.00 평균값medium 5.645.64 91.7891.78 2.582.58 100.00100.00 표준 편차값Standard deviation value 0.830.83 1.781.78 0.950.95 최대치Maximum 6.226.22 93.0493.04 3.263.26 최소치Minimum 5.055.05 90.5290.52 1.911.91

실시예3Example 3

슬래브를 1180℃까지 가열시키고, 노 내에서 250min동안 체류하며, 출탕온도는 1200℃이고, 고압수로 인을 제거하며, 인을 제거한 후 조압연을 진행하고, 2차 고압수 인 제거 후 재차 사상압연을 진행하며, 사상압연의 압연 시작온도는 950℃, 압연 마감온도는 800℃이고, 코일링온도는 550℃이고, 압연속도는 10m/s이며, 압연 후의 냉각속도는 30℃/s이고, 수득한 열연판의 두께는 4mm이며, 표면 스케일 평균 두께는 약 5㎛이고, 여기서 Fe3O4의 함량은 적어도 70%이다. 유화액 또는 순수를 윤활제로 사용하고, 열연판에 대하여 스케일을 구비한 냉연을 직접 진행하며, 변형률은 70%이고, 알칼리액으로 세척(알칼리 세척이 필요 없이 물로 세척), 및 건조시킨 후, 환원로에 진입시키며 환원온도는 600℃, 시간은 300s, 수소가스 농도는 20%, 465℃ 정도까지 냉각시킨 후 아연욕에 진입시키고 3s 체류시켜 용융아연도금을 완성함으로써 도금액 성분이 1.2Al wt%~Zn, 2.9mm 정도의 용융아연알루미늄 도금제품을 수득한다. The slab was heated to 1180 캜, stayed in the furnace for 250 min, and the temperature of the hot water was 1200 캜. The furnace was removed by high-pressure water, the phosphorus was removed and the rough rolling was carried out. After the second high- The rolling start temperature, the rolling finishing temperature, and the coiling temperature were 950 占 폚, 800 占 폚, 550 占 폚, 10 m / s and 30 占 폚 / s, respectively, The resulting hot-rolled sheet had a thickness of 4 mm and an average surface-scale thickness of about 5 탆, wherein the content of Fe 3 O 4 was at least 70%. The cold rolled stainless steel sheet was subjected to cold rolling with a scale on the hot rolled steel sheet as a lubricant and the strain was 70%. The steel sheet was washed with an alkaline solution (washed with water without washing with alkali), dried, And the reduction temperature was 600 ° C., the time was 300 s, the hydrogen gas concentration was 20%, and the temperature was lowered to 465 ° C. After entering the zinc bath, the hot dip galvanizing was completed for 3 s, , A hot-dip galvanized product of about 2.9 mm is obtained.

실시예4Example 4

슬래브를 1200℃까지 가열시키고, 노 내에서 200min동안 체류하며, 출탕온도는 1250℃이고, 고압수로 인을 제거하며, 인을 제거한 후 조압연을 진행하고, 2차 고압수 인 제거 후 재차 사상압연을 진행하며, 사상압연의 압연 시작온도는 980℃, 압연 마감온도는 880℃이고, 코일링온도는 570℃이고, 압연속도는 18m/s이며, 압연 후의 냉각속도는 12℃/s이고, 수득한 열연판의 두께는 3.6mm이며, 표면 스케일 평균 두께는 약 8㎛이고, 여기서 Fe3O4의 함량은 적어도 50%이다. 유화액 또는 순수를 윤활제로 사용하고, 열연판에 대하여 스케일을 구비한 냉연을 직접 진행하며, 1.5mm 두께까지 냉연하고, 변형률은 58%이며, 알칼리액으로 세척(순수로 압연 윤활을 진행할 때, 알칼리 세척이 필요 없고, 단지 온수로 세척하면 됨), 및 건조시킨 후, 환원로에 진입시키며 환원온도는 900℃, 시간은 120s, 수소가스 농도는 20%, 460℃ 정도까지 냉각시킨 후 아연욕에 진입시키고 3s 체류시켜 용융아연도금을 완성함으로써 아연액 성분이 1.6Al wt%~1.6Mg~Zn%, 1.2mm 정도의 용융아연알루미늄마그네슘 도금제품을 수득한다. The slab was heated to 1200 DEG C and stayed in the furnace for 200 minutes. The temperature of the hot water was 1250 DEG C, and phosphorus was removed by high pressure water. After the phosphorus was removed, rough rolling was carried out. After removal of the second high pressure water, The rolling start temperature, the rolling finish temperature, and the coiling temperature were 980 占 폚, 880 占 폚, 570 占 폚, 18 m / s, 12 占 폚 / s, The resulting hot-rolled sheet had a thickness of 3.6 mm and an average surface-scale thickness of about 8 μm, wherein the content of Fe 3 O 4 was at least 50%. The cold rolled stainless steel sheet was subjected to cold rolling with a scale to a thickness of 1.5 mm and a strain of 58% with an emulsion or pure water as a lubricant. The steel sheet was subjected to washing with an alkaline solution After cooling to a reduction temperature of 900 ° C., a time of 120 s, a hydrogen gas concentration of 20%, and a temperature of about 460 ° C., the reaction mixture was added to a zinc bath And the mixture is allowed to stand for 3 s to complete hot dip galvanizing, thereby obtaining a hot dip galvanized magnesium magnesium plated product having a zinc liquid component content of about 1.6 Al wt% to about 1.6 Mg to about 1.2 Mg.

실시예5Example 5

슬래브를 1230℃까지 가열시키고, 노 내에서 200min동안 체류하며, 출탕온도는 1190℃이고, 고압수로 인을 제거하며, 인을 제거한 후 조압연을 진행하고, 2차 고압수 인 제거 후 재차 사상압연을 진행하며, 사상압연의 압연 시작온도는 950℃, 압연 마감온도는 900℃이고, 코일링온도는 550℃이고, 압연속도는 21m/s이며, 압연 후의 냉각속도는 15℃/s이고, 수득한 열연판의 두께는 3.6mm이며, 표면 스케일 평균 두께는 약 8㎛이고, 여기서 Fe3O4의 함량은 적어도 50%이다. 유화액 또는 순수를 윤활제로 사용하고, 열연판에 대하여 스케일을 구비한 냉연을 직접 진행하며, 1.5mm 두께까지 냉연하고, 변형률은 58%이며, 알칼리액으로 세척(순수로 압연 윤활을 진행할 때, 알칼리 세척이 필요 없고, 단지 온수로 세척하면 됨), 및 건조시킨 후, 환원로에 진입시키며 환원온도는 900℃, 시간은 120s, 수소가스 농도는 20%, 680℃ 정도까지 냉각시킨 후 아연욕에 진입시키고 3s 체류시켜 아연액 성분이 11Si wt%~Al%, 1.2mm 정도의 용융알루미늄규소 도금제품을 수득한다. The slab was heated to 1230 캜 and stayed in the furnace for 200 min. The temperature of the hot water was 1190 캜. After removing the phosphorus by high-pressure water, the phosphorus was removed and rough rolling was carried out. The rolling start temperature was 950 deg. C, the rolling finishing temperature was 900 deg. C, the coiling temperature was 550 deg. C, the rolling speed was 21 m / s, the cooling rate after rolling was 15 deg. The resulting hot-rolled sheet had a thickness of 3.6 mm and an average surface-scale thickness of about 8 μm, wherein the content of Fe 3 O 4 was at least 50%. The cold rolled steel sheet was subjected to cold rolling with a scale to a thickness of 1.5 mm and a strain of 58%. The steel sheet was washed with an alkaline solution (when rolling with pure water, After cooling to about 680 ° C, the reduction temperature is set to 900 ° C, the time is set to 120s, the hydrogen gas concentration is set to 20% And allowed to stand for 3 s to obtain a molten aluminum silicon plated product having a zinc liquid component content of about 11 Si wt% to about Al 2 O 3 and about 1.2 mm.

실천을 통해 증명되는 바, 실시예2 내지 실시예5와 실시예1은 동일하며, 모두 기대에 부합되는 용융도금 제품을 정상적으로 수득할 수 있으며 현저한 스킵도금 또는 도금층 박리 현상이 없다. Practically, the second to fifth embodiments and the first embodiment are the same, and it is possible to normally obtain a hot-dip product conforming to the expectation, and there is no remarkable skip plating or plating layer peeling phenomenon.

결론적으로, 본 발명은 열연 공정에 대한 조절을 통해 열연판 표면 스케일 구조를 제어함으로써 열연판의 스케일을 구비한 냉연을 진행하여, 스케일이 냉연 변형 과정에서 베이스에 따라 소성 변형이 발생하나 스폴링이 발생하지 않도록 하고, 다음 환원성 가스(CO 또는 H2)에 의해 스케일과 반응하여 금속 철을 생성하며, 마지막으로 용융아연도금을 진행한다. 전통적인 용융아연도금 공정에 비하여, 해당 공정은 산세척 및 관련 공정을 생략하였고, 산세척으로 스케일을 제거하지 않아도 되므로, 염산, 황산과 같은 그 어떠한 부식성 매질과도 관련되지 않아 근본적으로 산세척에 따른 환경오염 문제를 해결하였으며, 과정이 짧고 효율이 높으며 원가가 낮은 친환경형 용융아연도금 생산 공정으로서 실제 수요를 만족시킬 수 있는 성능을 구비한다. As a result, according to the present invention, by controlling the hot-rolled sheet surface scale structure, the cold rolling with the scale of the hot-rolled sheet proceeds to cause the plastic deformation of the scale along the base during cold rolling, And then reacts with the scale by the following reducing gas (CO or H 2 ) to generate metal iron, and finally the hot-dip galvanizing proceeds. Compared to conventional hot dip galvanizing processes, the process omits pickling and associated processes, does not require scaling by pickling, and is therefore not associated with any corrosive media such as hydrochloric acid, sulfuric acid, It is environmentally friendly hot dip galvanizing production process which solves the environmental pollution problem, has a short process, high efficiency and low cost, and has the capability to meet actual demand.

본 발명의 열연 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법에 의하면, 상이한 두께 규격의 용융도금 제품을 수득할 수 있고, 특히 두꺼운 규격의 용융아연도금 제품을 수득할 수 있다. 또한, 수득한 제품은 표면 품질에 대한 요구가 높지 않고, 내식성 및 기계적 성능에 대하여 일정한 요구가 있는 경우, 예를 들어 각종 건축용 강, 전력설비용 강, 고속도로 및 각종 교량 난간, 창고 및 공장 건물용 강 등 영역에 적합하다.According to the production method of the hot-rolled three-dimensionally direct cold-reduced annealed hot-dip galvanized product of the present invention, hot-dip galvanized products of different thickness standards can be obtained, and hot- In addition, when the obtained product is not required to have high surface quality, and there is a certain demand for corrosion resistance and mechanical performance, for example, various kinds of steel for construction, steel for power equipment, highway and various railings for bridges, warehouses and factory buildings Suitable for areas such as river.

주의해야 할 점은, 상기 서술한 내용은 단지 본 발명의 구체적인 실시예일뿐, 본 발명은 상기 실시예에 한정되지 않고, 이에 따라 여러 가지 유사한 변화가 있을 수 있다. 본 발명이 속하는 기술분야의 당업자는, 본 발명에 의해 공개된 내용으로부터 모든 변형을 직접적으로 도출 또는 연상해낼 수 있으며, 이는 모두 본 발명의 보호범위에 속해야 할 것이다. 즉, 본 발명의 상기 설명 내용을 열독한 후, 본 발명이 속하는 기술분야의 당업자는 본 발명에 대해 각종 변경 또는 수정을 진행할 수 있으며, 이러한 등가 형식은 역시 본원 출원에 첨부된 특허청구범위에 한정된 범위 내에 속한다고 이해해야 할 것이다.It should be noted that the above description is only a concrete example of the present invention, and the present invention is not limited to the above embodiments, and thus various similar changes may be made. Those skilled in the art to which the present invention pertains can directly derive or associate all variations from the teachings of the present invention, all of which fall within the scope of the present invention. That is, those skilled in the art will be able to make various changes and modifications of the present invention after reading the foregoing description of the present invention, which equivalents are also intended to be within the scope of the claims appended hereto It should be understood that it falls within the scope.

Claims (16)

슬래브에 대하여 인을 제거한 후, 순차적으로 조압연기의 조압연, 사상압연기의 사상압연, 냉각장치의 냉각, 권취기의 코일링을 거치고, 출탕온도를 낮추고 압연속도를 높임으로써 스케일 두께를 감소시키는 동시에 압연 후의 냉각속도와 코일링온도를 제어하여 열연판 표면 스케일 구조를 제어하며, 스케일 부착력을 향상시키고 스케일 두께를 감소시키는, 열연 유닛을 통해 열연하는 단계;
압연압력, 장력, 변형률 및 압연패스횟수를 포함하는 냉연 공정 매개변수를 최적화하고 압연 윤활액을 사용하여 스케일이 냉연과정에서 베이스에 따라 양호한 소성 변형이 발생되도록 함으로써 높은 표면품질 및 판 형상의 스케일판을 수득하는, 냉연 유닛을 통해 냉연하는 단계;
환원성 가스를 통입시키고 환원온도 및 시간을 제어하며, 스케일을 철저하게 환원시키고 띠강이 아연욕으로 진입하는 온도까지 냉각시키는, 환원로를 통해 환원 어닐링하는 단계; 및
환원 어닐링 후 직접 아연욕으로 진입하고 몇 초간 체류시켜 용융도금을 완성하는, 용융도금 단계
를 포함하는 것을 특징으로 하는 열연 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법.After removing the phosphorus from the slab, the scale thickness is reduced by sequentially performing rough rolling of the roughing mill, finishing of the finishing mill, cooling of the cooling apparatus, coiling of the coiling machine, lowering the temperature of the hot water and increasing the rolling speed Hot rolling through a hot rolling unit, controlling the cooling rate and the coiling temperature after rolling to control the hot-rolled plate surface scale structure, improving the scale adhesion, and reducing the scale thickness;
By optimizing the cold rolling process parameters, including rolling pressure, tension, strain and rolling pass frequency, and using a rolling lubricant, a good plastic deformation along the base can be generated during the cold rolling of the scale, Cold rolling through a cold-rolling unit;
Performing a reduction annealing through a reducing furnace to reduce the temperature and time of the reducing gas, thoroughly reducing the scale, and cooling the strip to a temperature at which the strip enters the zinc bath; And
A hot dip galvanizing step of directly entering the zinc bath after the reduction annealing and staying for a few seconds to complete the hot dip galvanizing step
Wherein the hot-rolled annealed direct cold-rolled annealed hot-rolled annealed hot-dip galvanized product is produced by the method. 제1항에 있어서,
탈지세정장치에서 알칼리성 탈지제를 사용하여 냉연 과정에서 표면에 잔류된 기름때 및 분진을 제거하고, 세정 및 건조시키는, 냉연 단계 후의 탈지단계를 더 포함하는 것을 특징으로 하는 열연 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법.The method according to claim 1,
Further comprising a degreasing step after the cold rolling step of removing the oil mist and dust remaining on the surface during the cold rolling process using an alkaline degreasing agent in the degreasing and cleaning apparatus and washing and drying the hot rolled sheet, Product production method. 제1항에 있어서,
열연단계에서, 출탕온도는 1100~1250℃이고, 압연 마감온도는 800~900℃이며, 코일링온도는 550~600℃ 사이이고, 압연속도는 8~20m/s이며, 압연 후 냉각속도는 7~30℃/s인 것을 특징으로 하는 열연 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법.The method according to claim 1,
In the hot rolling step, the tapping temperature is 1100 to 1250 占 폚, the rolling finishing temperature is 800 to 900 占 폚, the coiling temperature is 550 to 600 占 폚, the rolling speed is 8 to 20 m / s, To 30 < 0 > C / s. ≪ / RTI > 제3항에 있어서,
상기 출탕온도는 1150~1200℃이고, 압연 마감온도는 840~870℃이며, 코일링온도는 550~570℃이고, 압연속도는 14~18m/s이며, 냉각속도는 15~20℃/s인 것을 특징으로 하는 열연 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법.The method of claim 3,
Wherein the hot water temperature is from 1150 to 1200 캜, the rolling finishing temperature is from 840 to 870 캜, the coiling temperature is from 550 to 570 캜, the rolling speed is from 14 to 18 m / s, and the cooling rate is from 15 to 20 캜 / Wherein the hot-rolled annealed hot-rolled annealed hot-rolled annealed hot-rolled annealed hot- 제3항 또는 제4항에 있어서,
상기 출탕온도는 1170~1200℃이고, 압연 마감온도는 850℃ 또는 860℃이며, 코일링온도는 550℃ 또는 560℃이고, 압연속도는 17m/s 또는 18m/s이며, 냉각속도는 19℃/s 또는 20℃/s인 것을 특징으로 하는 열연 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법.The method according to claim 3 or 4,
The rolling temperature is 1170 to 1200 ° C, the rolling finishing temperature is 850 ° C or 860 ° C, the coiling temperature is 550 ° C or 560 ° C, the rolling speed is 17m / s or 18m / s, s or 20 ° C / s. A method for producing a hot-rolled, three-sided, direct cold-reduced annealing, hot-dip galvanized product. 제1항에 있어서,
열연단계에서, 수득한 열연판 두께는 1.0~6mm이고, 열연판 표면 스케일의 평균 두께는 5~10㎛이며, 스케일구조는 Fe3O4 및 FeO를 위주로 하고, 여기서 Fe3O4의 중량함량은 50% 이상을 차지하는 것을 특징으로 하는 열연 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법.The method according to claim 1,
In the hot rolling step, the resulting hot-rolled sheet thickness is 1.0 ~ 6mm, and the hot-rolled steel sheet average thickness of the surface scale is 5 ~ 10㎛, the scale structure is Fe 3 O 4 and FeO and the focusing, where the weight percentage of Fe 3 O 4 Wherein the hot rolled annealed steel sheet comprises 50% or more of the hot rolled annealed direct cold rolled annealed annealed hot rolled steel sheet. 제6항에 있어서,
상기 열연판 두께는 1.5~4mm이고, 상기 Fe3O4의 함량은 65% 이상을 차지하는 것을 특징으로 하는 열연 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법.The method according to claim 6,
Wherein the hot rolled sheet thickness is 1.5 to 4 mm and the content of Fe 3 O 4 is 65% or more. 제1항에 있어서,
냉연단계에서, 압연패스는 1~2회 내에 완성되고, 매차례 변형률은 1.0%~90%로 제어하는 것을 특징으로 하는 열연 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법.The method according to claim 1,
Wherein the rolling pass is completed within 1 to 2 times in the cold rolling step, and the strain is controlled to be 1.0% to 90% each time the hot rolling is performed. 제8항에 있어서,
상기 압연패스는 1회 내에 완성되고, 변형률은 50%~80%로 제어하는 것을 특징으로 하는 열연 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법.9. The method of claim 8,
Wherein the rolling pass is completed within one time and the strain is controlled to be between 50% and 80%. 제1항 또는 제8항에 있어서,
냉연단계에서, 압연 유화액은 탈이온수 또는 팜유를 사용하고, 냉연 압하율은 1.0%~90%인 것을 특징으로 하는 열연 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법.The method according to claim 1 or 8,
In the cold rolling step, deionized water or palm oil is used as the rolling emulsion, and the cold rolling reduction ratio is 1.0% to 90%. 제10항에 있어서,
상기 냉연 압하율은 50%~80%인 것을 특징으로 하는 열연 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법.11. The method of claim 10,
Wherein the cold rolling reduction rate is 50% to 80%. 제1항에 있어서,
환원 어닐링 단계에서, 환원온도는 500~1000℃이고, 환원시간은 60~300s이며, 환원성 가스는 H2 또는 CO와 불활성가스의 혼합물이고, 여기서 H2 또는 CO의 농도는 3% 이상인 것을 특징으로 하는 열연 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법.The method according to claim 1,
In the reduction annealing step, the reduction temperature is 500 to 1000 ° C., the reduction time is 60 to 300 s, and the reducing gas is a mixture of H 2 or CO and an inert gas, wherein the concentration of H 2 or CO is 3% or more Method for producing hot-rolled annealed hot-rolled annealed galvanized product. 제12항에 있어서,
상기의 환원온도는 750~950℃이고, 체류시간은 120~300s이며, H2 또는 CO의 농도는 10%~75%인 것을 특징으로 하는 열연 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법.13. The method of claim 12,
Wherein the reduction temperature is 750 to 950 캜, the residence time is 120 to 300 s, and the concentration of H 2 or CO is 10% to 75%. 제12항 또는 제13항에 있어서,
상기의 환원온도는 800℃, 850℃ 또는 900℃이고, 체류시간은 180s, 240s 또는 300s이며, H2 또는 CO의 농도는 15%, 25% 또는 30%인 것을 특징으로 하는 열연 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법.The method according to claim 12 or 13,
Characterized in that the reduction temperature is 800 ° C, 850 ° C or 900 ° C, the residence time is 180s, 240s or 300s and the concentration of H 2 or CO is 15%, 25% or 30% A method for producing a reduced - annealed hot - dip galvanized product. 제12항에 있어서,
환원 어닐링 단계에서, 반응에 참여하지 않은 H2 또는 CO는 순환 사용되는 것을 특징으로 하는 열연 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법.13. The method of claim 12,
Wherein the unreacted H 2 or CO is recycled during the reductive annealing step. 제1항에 있어서,
용융도금 단계에서, 수득한 용융도금제품은 용융순수아연도금, 용융아연알루미늄마그네슘도금, 용융알루미늄아연도금 또는 용융알루미늄규소도금 제품을 포함하는 것을 특징으로 하는 열연 무산세 직접 냉연 환원 어닐링 용융도금 제품의 생산방법.The method according to claim 1,
The hot-dip galvanized product obtained by the hot-dip galvanizing step includes a hot-dip galvanized product obtained by hot-dip galvanizing, hot-dip galvanized magnesium plating, hot-dip galvanized or hot- Production method.
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