KR0143501B1 - The making method of galvanized steel plate - Google Patents

The making method of galvanized steel plate

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Publication number
KR0143501B1
KR0143501B1 KR1019940029406A KR19940029406A KR0143501B1 KR 0143501 B1 KR0143501 B1 KR 0143501B1 KR 1019940029406 A KR1019940029406 A KR 1019940029406A KR 19940029406 A KR19940029406 A KR 19940029406A KR 0143501 B1 KR0143501 B1 KR 0143501B1
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hot
steel sheet
less
galvanized steel
cgl
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KR1019940029406A
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Korean (ko)
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KR960017897A (en
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이병희
박제석
유흥종
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김만제
포항종합제철주식회사
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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
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • 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
    • C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Coating With Molten Metal (AREA)

Abstract

본 발명은 건자재, 파이프등과같이 구조물을 지지하는데 사용되는 고강도 구조용 용융아연 도금강판을 제조하는 방법에 관한 것으로써, 강조성을 적절히 선정하여 재결정온도를 높힘으로써 CGL의 생산성확보 및 표면형상등의 품질도 동시에 만족시킬 수 있는 고강도 구조용 용융아연도금 강판을 제조하고자 하는데, 그 목적이 있다.The present invention relates to a method for manufacturing a high strength structural hot-dip galvanized steel sheet used to support a structure such as building materials, pipes, etc., by properly selecting the emphasis and increasing the recrystallization temperature to secure the productivity of the CGL and the quality of the surface shape, etc. At the same time it is to produce a high-strength structural hot-dip galvanized steel sheet, which has the purpose.

본 발명은 강 슬라브를 열간압연 및 내간압연한후, 연속용융아연도금 라인(CGL)에서 연속용융아연도금하여 고강도 구조용 용융아연 도금강판을 제조하는 방법에 있어서, 중량%로, C:0.04-0.10%, Mn:0.20-0.50%, Si:0.05%이하, P:0.02%이하, S:0.02%이하, Ti:0.05-0.10%, N:0.01%이하, 잔부 Fe 및 기타불가피한 불순물로 조성되고, 유효 Ti*(Ti*=Ti-4C-3.4N-1.5S)가 -(negative)값을 갖는 강 슬라브를 열간 압연하고, 540-580℃에서 권취한 다음, 냉간압연한후, 전처리하여 620-680℃에서 CGL소둔한 다음, 용융아연도금한후, 조질압연, 후처리및 권취하여 고강도 구조용 용융아연도금강판을 제조하는 방법을 그 요지로 한다.The present invention is a method for producing a high strength structural hot-dip galvanized steel sheet by hot-rolled and hot-rolled steel slab, followed by continuous hot-dip galvanizing in a continuous hot dip galvanizing line (CGL), C: 0.04-0.10 %, Mn: 0.20-0.50%, Si: 0.05% or less, P: 0.02% or less, S: 0.02% or less, Ti: 0.05-0.10%, N: 0.01% or less, balance Fe and other unavoidable impurities, A steel slab having an effective Ti * (Ti * = Ti-4C-3.4N-1.5S) of-(negative) is hot rolled, wound up at 540-580 ° C, cold rolled and then pretreated After the CGL annealing at 680 ° C., followed by hot dip galvanizing, temper rolling, post-treatment and winding to produce a hot dip galvanized steel sheet for high strength structure.

Description

고강도 구조용 용융아연 도금강판의 제조방법Manufacturing method of hot dip galvanized steel sheet for high strength structure

본 발명은 건자재, 파이프등과 같이 구조물을 지지하는데 사용되는 고강도 구조용 용융아연 도금강판을 제조하는 방법에 관한 것이다.The present invention relates to a method for producing a high strength structural hot-dip galvanized steel sheet used to support a structure such as building materials, pipes and the like.

용융아연 도금 강판을 제조하는 연속 용융아연도금라인(이하, CGL이라고도 칭함)의 핵심 설비는 냉간압연된 강판을 적정한 열처리를 통하여 수요가가 요구하는 재질을 얻도록하는 열처리로(Furnace)와 용융된 아연을 강판에 부착시키는 도금설비로 구성되어 있다.The core equipment of the continuous hot dip galvanizing line (hereinafter referred to as CGL) for manufacturing hot dip galvanized steel sheet is a furnace and molten furnace that allows the cold rolled steel sheet to be obtained by proper heat treatment to obtain the material required by the demand. It is composed of plating equipment for attaching zinc to steel sheets.

용융 아연 도금강판의 소재는 냉간압연된 강판이며 이 압연강판은 압연조직을 가지고 있어 연성이 거의 없는 딱딱하고 고강도의 재질을 가지고 있다. 따라서 최종 제품이 목표하는 재질을 얻기위해 CGL열처리로에서 열처리에 의해 재결정 조직을 얻게되는데 이 재결정온도는 강종에 따라 차이가 있지만 통상 500℃이상의 온도가 된다. 재결정이 일어난 강판은 냉간압연된 강판에 비해 재질이 연하고 가공성이 좋아 재결정 조직의 형태에 따라 여러가지 용도에 적용될수 있다.The material of hot dip galvanized steel sheet is cold rolled steel sheet, which has a rolling structure and has hard and high strength material with little ductility. Therefore, in order to obtain the target material of the final product, a recrystallized structure is obtained by heat treatment in a CGL heat treatment furnace. The recrystallization temperature is different depending on the steel grade, but is usually higher than 500 ° C. Recrystallized steel sheet is softer and more workable than cold rolled steel sheet and can be applied to various applications depending on the shape of recrystallized structure.

건자재, 파이프등과 같이 구조물을 지지하는데 사용되는 구조용 용융아연 도금강판은 고인장강도 및 고항복강도의 재질이 요구된다.Structural hot-dip galvanized steel sheets used to support structures such as building materials, pipes, etc., require high tensile strength and high yield strength.

이러한 고강도재질의 구조용 용융아연도금강판을 제조하기 위해서는 상기한 재결정 과정을 생략하거나 경미한 재결정공정을 거쳐야만 한다.In order to manufacture the structural hot-dip galvanized steel sheet of such a high strength material, the recrystallization process described above should be omitted or subjected to a slight recrystallization process.

이론적으로 볼때 열처리로 온도만 충분히 낮출수 있으면 대부분의 강종에서 고강도 구조용강을 제조할 수 있다. 그러나 열처리로 온도 하향작업을 할 경우 표면 형상불량, 설비트러블(Trouble)발생 가능성으로 작업성, 품질 및 생산실수율 하락을 피할수 없게 되어 재질확보만을 위해 열처리로 온도를 하향 할수만은 없는 것이다.Theoretically, high temperature structural steels can be produced in most steel grades if the temperature can be lowered sufficiently by heat treatment. However, when the temperature is lowered by heat treatment, it is impossible to lower the workability, quality, and production yield due to surface defects and the possibility of trouble, and thus it is not possible to lower the temperature of the heat treatment furnace only to secure materials.

통상, CGL의 경우 590℃까지는 하향조업이 가능하나 정상적인 품질 및 생산성이 고려된 일반적인 조업의 온도범위는 620-830℃이다.In general, in case of CGL, it is possible to operate down to 590 ° C, but the temperature range of general operation considering normal quality and productivity is 620-830 ° C.

따라서, 본 발명은 강조성을 적절히 선정하여 재결정온도를 높힘으로써 CGL의 생산성 확보 및 표면형상등의 품질도 동시에 만족시킬수 있는 고강도 구조용 용융아연 도금강판을 제조하고자 하는데, 그 목적이 있다.Accordingly, the present invention is to produce a high-strength structural hot-dip galvanized steel sheet that can satisfy the CGL productivity and surface quality at the same time by properly selecting the emphasis to increase the recrystallization temperature, the purpose is to.

이하, 본 발명에 대하여 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated.

본 발명은 강 슬라브를 열간압연 및 냉간압연한 후, 연속용융 아연도금라인(CGL)에서 연속용융 아연도금한 후 조질압연, 후처리 및 권취하여 이루어지는 고강도 구조용 용융아연 도금강판을 제조하는 방법에 있어서,The present invention is a method for producing a high-strength structural hot-dip galvanized steel sheet formed by hot-rolled and cold-rolled steel slab, followed by continuous hot dip galvanizing in a continuous hot dip galvanizing line (CGL), followed by temper rolling, post-treatment and winding. ,

중량%로, C:0.04-0.10%, Mn:0.20-0.50%, Si:0.02%이하, P:0.02%이하, S:0.02%이하, Ti:0.05-0.10%, N:0.01%이하, 잔부 Fe 및 기타 불가피한 불순물로 조성되고, 유효 Ti*(Ti*=Ti-4C-3.4N-1.5S)가 -(negative)값을 갖는 강 슬라브를 열간압연하고, 540-580℃에서 권취한 다음, 냉간압연한후, 전처리하여 620-680℃에서 CGL소둔한 다음, 용융아연도금하는 것을 포함한 고강도 구조용 용융아연도금강판을 제조하는 방법에 관한 것이다.By weight%, C: 0.04-0.10%, Mn: 0.20-0.50%, Si: 0.02% or less, P: 0.02% or less, S: 0.02% or less, Ti: 0.05-0.10%, N: 0.01% or less, balance A steel slab composed of Fe and other unavoidable impurities and having an effective Ti * (Ti * = Ti-4C-3.4N-1.5S) of-(negative) is hot rolled and wound up at 540-580 ° C, After cold rolling, pretreatment and CGL annealing at 620-680 ° C., and then hot-dip galvanizing, the present invention relates to a method for producing a hot-dip structural hot-dip galvanized steel sheet.

이하, 본 발명에 대하여 상세히 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

본 발명의 촛점은 표면, 형상, 생산성등의 품질확보 가능조업에서도 완전한 재결정이 일어나지 않는 즉, 높은 재결정 온도를 갖는 강종을 개발하고, 이 강종에 맞는 적절한 제조공정조건을 적용하므로써 고강도 구조용 용융아연 도금강판을 제조하는데 있다.The focus of the present invention is that hot-dip galvanizing for high-strength structures is achieved by developing steel grades with high recrystallization temperatures, that is, complete recrystallization does not occur even in quality-enable operations such as surface, shape, and productivity. In manufacturing steel sheet.

현재 사용되고 있는 기존의 강종(Ti-P첨가 극저탄소강)도 높은 재결정온도를 갖는 강종으로 고강도의 재질확보가 가능했지만 하기표 1와같이 ASTM규격의 P성분규제치를 초과하기 때문에 저온취성발생 우려가 커서 수요가 제한되고, 수요가의 불만을 야기할 우려가 있는 등의 문제점이 있다.The existing steel grades (Ti-P-added ultra low carbon steels) are also steels with high recrystallization temperature, which makes it possible to secure high-strength materials, but there is a fear of low temperature embrittlement because they exceed the P-component limits of ASTM standards as shown in Table 1 below. There is a problem in that the demand is limited and there is a fear of causing dissatisfaction of the demand.

*P성분 규격대비 초과* P component exceeded standard

따라서, 본 발명자들은 ASTM성분조건을 만족하고 고강도 재질을 확보할 수 있는 Ti 첨가 저탄소강을 개발하게 된다.Accordingly, the present inventors develop Ti-added low carbon steel that satisfies ASTM component conditions and secures high strength materials.

본 발명의 강조성에 있어, 상기 C은 강판의 기계적성질에 가장 큰 영향을 주는 원소로서 첨가량이 많을수록 강도는 증가하고 연신율은 감소하는데, 본 발명에서는 강도확보를 위하여 최소 0.04%는 함유되어야하지만, 과다함유시에는 롤 부하가 심하게 되므로 그 상한은 0.10%로 제한한다.In the emphasis of the present invention, the C is the element that has the greatest influence on the mechanical properties of the steel sheet, the more the amount added, the strength increases and the elongation decreases, but in the present invention, at least 0.04% should be included for securing the strength, but it is excessive. When contained, the roll load is severe, so the upper limit thereof is limited to 0.10%.

상기 Mn은 열간취성의 원인이 되는 S를 제거하기 위하여 첨가되는 성분으로서, 그 함량이 0.20%이하인 경우에는 첨가효과가 미약하고, 0.50%이상인 경우에는 연성과 가공성을 떨어뜨리게되므로, 상기 Mn의 함량은 0.20-0.50%로 제한하는 것이 바람직하다.The Mn is a component added to remove S, which is a cause of hot brittleness, and when the content is 0.20% or less, the effect of addition is weak, and when the content is 0.50% or more, the ductility and workability are deteriorated. Is preferably limited to 0.20-0.50%.

상기 P 및 S는 인성 및 연성을 저하시키는 원소로서 응고시 뚜렷하게 편석을 일으켜 평균함량이 낮아도 국부적으로 0.1% 이상까지 도달할 수 있으므로 그 함량은 각각 0.02% 이하로 낮게 관리하는 것이 바람직하다.The P and S are elements that lower toughness and ductility, so that segregation may occur distinctly upon solidification, so that even when the average content is low, the P and S may locally reach 0.1% or more.

상기 Si는 고강도 성형용에 첨가원소로서 사용되나 용융도금강판에서는 표면산화물생성이 용이하여 도금부착성을 열화시키므로 0.02%이하로 제한하는것이 바람직하다.The Si is used as an additive element for high strength molding, but in hot-dip galvanized steel sheet, it is preferable to limit it to 0.02% or less because surface oxide formation is easy and deterioration of plating adhesion.

상기 Ti은 미세한 TiC석출물을 형성하여 재결정온도를 상승시키기위하여 첨가되는 원소로서, 그 함량은 상기 첨가효과와 함께 재질확보 및 원가측면을 고려하여 0.05-0.10%로 제한하는 것이 바람직하다.The Ti is an element added to form a fine TiC precipitate to increase the recrystallization temperature, the content is preferably limited to 0.05-0.10% in consideration of the material and cost side with the addition effect.

상기 유효 Ti (Ti =Ti-4C-3.4N-1.5S)값은 -값이 되어야 하는데, 그 이유는 C,N,S세원소중 결합순서가 가장 늦은 C이 불안전하게 결합됨으로서 미세한 석출물 생성이 이루어지기 때문이다.The effective Ti (Ti The value of Ti-4C-3.4N-1.5S) should be-because fine C precipitates are produced by instably binding of C, which has the lowest bonding order among C, N, and S elements.

상기 N는 침입형 고용원소로서 가공시 스트래처 스트레인 현상을 유발시켜 제품의 표면 상태를 열화시키므로 0.01%이하로 제한하는 것이 바람직하다.Since N is an invasive solid solution, it causes a strainer strain during processing to deteriorate the surface state of the product. Therefore, N is preferably limited to 0.01% or less.

본 발명에서는 상기와 같이 조성되는 강 슬라브를 가열하여 통상의 방법으로 열간압연한후 540-580℃에서 권취한 다음, 냉간압연한다.In the present invention, the steel slab formed as described above is heated and hot rolled by a conventional method, then wound at 540-580 ° C., followed by cold rolling.

상기 권취온도가 540℃이하인 경우에는 열연강판이 경하게 되어 권취가 곤란하게되고, 580℃이상인 경우에는 결정립이 커져서 최종제품의 강도를 저하시키므로, 본 발명에 있어 열연강판의 권취온도는 540-580℃로 제한하는것이 바람직하다.When the coiling temperature is 540 ℃ or less, the hot rolled steel sheet is hard to be wound, and when the coiling temperature is 580 ℃ or more, the grain size is increased to lower the strength of the final product, the coiling temperature of the hot rolled steel sheet in the present invention is 540-580 It is preferable to limit to ℃.

본 발명에 바람직하게 적용될수 있는 슬라브 가열온도 및 마무리 압연온도는 각각 1100-1200℃ 및 860-900℃정도이다.The slab heating temperature and finish rolling temperature which can be preferably applied to the present invention are about 1100-1200 ° C. and 860-900 ° C., respectively.

다음에, 상기와 같이 냉간압연된 냉연강판을 통상적인 방법으로 전처리한 다음, CGL소둔로에 장입하여 620-680℃의 온도범위에서 소둔한 다음, 용융아연도금욕에서 용융아연도금한후, 조질압연, 후처리 및 권취하므로써, 고강도 구조용 용융아연도금강판이 제조된다.Next, the cold rolled cold rolled steel sheet as described above is pretreated in a conventional manner, and then charged into a CGL annealing furnace and annealed at a temperature range of 620-680 ° C., followed by hot dip galvanizing in a hot dip galvanizing bath. By rolling, post-treatment and winding, a hot-dip galvanized steel sheet for high strength structure is produced.

상기 CGL소둔온도가 620℃이하인 경우에는 강도는 향상되지만, 연신율이 급격히 저하되고, 680℃이상인 경우에는 재결정 온도를 초과하게 되어 고강도 재질확보가 불가능하게되므로, 상기 CGL소둔온도는 620-680℃로 선정하는 것이 바람직하다.If the CGL annealing temperature is less than 620 ℃ the strength is improved, but the elongation is sharply lowered, if it is more than 680 ℃ above the recrystallization temperature is impossible to secure a high-strength material, the CGL annealing temperature is 620-680 ℃ It is preferable to select.

이때의 소둔분위기는 통상의 환원성 분위기로 하면 된다.The annealing atmosphere at this time may be a normal reducing atmosphere.

본 발명에 바람직하게 적용될수 있는 용융아연 도금욕의 온도는 440-460℃정도이다.The temperature of the hot dip galvanizing bath that can be preferably applied to the present invention is about 440-460 ℃.

이하, 실시예를 통하여 본 발명을 보다 구체적으로 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.

[실시예 1]Example 1

극저탄소강의 시효현상방지를 위해 Ti을 첨가할 경우 재결정온도의 변화가 일어나는데 착안하여 Ti첨가에 따른 재결정온도의 변화를 시뮬레이션 시험(Simulation test)을 행하고, 그 결과를 하기표 2에 나타내었다.When Ti is added to prevent aging of the ultra low carbon steel, the recrystallization temperature is changed, and a simulation test is performed on the change of recrystallization temperature according to the addition of Ti, and the results are shown in Table 2 below.

상기 표2에 나타난 바와같이, 저탄소강에서 Ti을 첨가하지 않았을 때에 비해 Ti을 첨가했을때 재결정온도가 약 60℃정도 증가됨을 알수 있다.As shown in Table 2, it can be seen that the recrystallization temperature is increased by about 60 ° C. when Ti is added in the low carbon steel when Ti is not added.

다시말하면, 저탄소 강중에 Ti를 첨가함에 따라 재결정온도가 급격히 올라가는 것을 알수 있다.In other words, it can be seen that the recrystallization temperature rises rapidly as Ti is added to the low carbon steel.

그러나, 상기표2의 강종은 재결정온도가 600℃로 실조업시 소둔로 온도를 600℃이하로 조압해야만 고강도 재질확보가 가능함을 알수 있다.However, it can be seen that the steel grade of Table 2 can be secured by high-temperature materials only when the recrystallization temperature is controlled to 600 ° C. when the annealing furnace temperature is adjusted to 600 ° C. or lower.

따라서, 본 발명자들은 Ti의 함량을 상기표 2의 강종에서 보다 증가시켜 본 발명강종을 완성하게 된것이다.Therefore, the present inventors have completed the present invention steel species by increasing the content of Ti in the steel grades of Table 2 above.

[실시예 2]Example 2

하기표 3과같이 조성되는 강 슬라브를 1160℃로 가열하여 열간압연한후 580℃이하에서 권취하고, 냉간압연하여 냉연강판을 제조하였다.The steel slab, as shown in Table 3, was heated to 1160 ° C., hot rolled, wound up to 580 ° C. or lower, and cold rolled to prepare a cold rolled steel sheet.

상기와같이 제조된 냉연강판을 전처리한후, CGL소둔로에서 620-680℃의 소둔온도조건에서 소둔한 다음, 450℃의 아연용융도금욕에서 용융아연도금한후 조질압연하여 기계적특성을 측정하고, 그 결과를 하기표 4에 나타내었다.After pretreatment of the cold rolled steel sheet prepared as above, it was annealed in an annealing temperature condition of 620-680 ° C. in a CGL annealing furnace, and then hot-dipped galvanized in a zinc hot dip galvanizing bath at 450 ° C. to measure mechanical properties. The results are shown in Table 4 below.

Ti :Ti-4C-3.4N-1.5STi : Ti-4C-3.4N-1.5S

상기표 4에 나타난 바와같이, 본 발명에 따라 제조된 발명강은 우수한 항복강도 및 인장강도를 갖게됨을 알수 있다.As shown in Table 4, it can be seen that the inventive steel produced according to the present invention has excellent yield strength and tensile strength.

[실시예 3]Example 3

하기표 5와같이 조성되는 강 슬라브를 1160℃로 가열하여 하기표6과 같은 마무리압연온도 조건으로 열간압연한후, 냉간압연하여 최종두께 0.55mm의 냉연강판을 제조하였다.A steel slab formed as shown in Table 5 was heated to 1160 ° C., hot rolled under the finishing rolling temperature conditions as shown in Table 6, and then cold rolled to prepare a cold rolled steel sheet having a final thickness of 0.55 mm.

상기와같이 제조된 냉연강판을 탈지처리하기 위해 NaOH 용액으로 전처리한 다음, 하기표 6의 CGL소둔온도 조건으로 CGL 소둔 한 후, 450℃의 용융아연 도금욕에 통과시켜 용융아연 도금한 다음 조질압연하였다.The cold rolled steel sheet prepared as described above was pretreated with NaOH solution, and then subjected to CGL annealing under the CGL annealing temperature conditions shown in Table 6, followed by passing through a hot dip galvanizing bath at 450 ° C., followed by hot rolling. It was.

이때 CGL 소둔분위기는 N+10%H의 환원성분위기로 하고, 소둔시간은 라인속도를 140mpm으로 하는 조건으로 하였다.At this time, the CGL annealing atmosphere was a reducing component atmosphere of N + 10% H, and the annealing time was set to a condition that the line speed was 140mpm.

상기와 같이 제조된 용융아연도금강판에 대하여 기계적 특성을 측정하고 그 결과를 하기표 6에 나타내었다.Mechanical properties of the hot-dip galvanized steel sheet prepared as described above were measured and the results are shown in Table 6 below.

Ti :Ti-4C-3.4N-1.5STi : Ti-4C-3.4N-1.5S

상기표 6에서 나타난 바와같이, 본 발명에 따라 제조된 발명재(a,b)는 항복강도 및 인장강도에 있어 우수함을 알수 있다.As shown in Table 6, it can be seen that the inventive material (a, b) prepared according to the present invention is excellent in yield strength and tensile strength.

한편, 종래재(2)의 경우에도 고강도 재질 확보가 가능하지만 P성분이 ASTM규격을 초과하게 된다.On the other hand, in the case of the conventional material (2) it is possible to secure a high-strength material, but the P component exceeds the ASTM standard.

Claims (1)

강슬라브를 연간압연 및 냉간압연한 후, 연속용융아연 도금라인(CGL)에서 연속용융아연도금한 후 조질압연, 후처리 및 권취하여 이루어지는 고강도 구조용 용융아연 도금강판을 제조하는 방법에 있어서, 중량%로 C:0.04-0.10%, Mn:0.20-0.50%, Si:0.02%이하, P:0.02%이하, S:0.02%이하, Ti:0.05-0.10%, N:0.01%이하, 잔부 Fe 및 기타 불가피한 불순물로 조성되고, 유효 Ti*(Ti*=Ti-4C-3.4N-1.5S)가 -(negative) 값을 갖는 강슬라브를 열간압연하고, 540-580℃에서 권취한 다음, 냉간압연한 후, 전처리하여 620-680℃에서 CGL소둔한 다음, 용융아연도금하는 것을 포함하여 이루어짐을 특징으로 하는 고강도 구조용 용융아연 도금강판의 제조방법In the method of manufacturing a high-strength structural hot-dip galvanized steel sheet obtained by rolling the steel slab annually and cold rolling, followed by continuous hot dip galvanizing in a continuous hot dip galvanizing line (CGL), followed by temper rolling, post-treatment and winding. C: 0.04-0.10%, Mn: 0.20-0.50%, Si: 0.02% or less, P: 0.02% or less, S: 0.02% or less, Ti: 0.05-0.10%, N: 0.01% or less, balance Fe and others A steel slab composed of unavoidable impurities and having an effective Ti * (Ti * = Ti-4C-3.4N-1.5S) of-(negative) value is hot rolled, wound at 540-580 ° C., and then cold rolled. After the pretreatment, CGL annealing at 620-680 ℃, followed by hot-dip galvanizing method for producing a high-strength structural hot-dip galvanized steel sheet comprising the
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