KR20030035697A - A method for manufacturing high intensity tin plating steel plate having good aging property and corrosion-resistance and broken-resistance - Google Patents
A method for manufacturing high intensity tin plating steel plate having good aging property and corrosion-resistance and broken-resistance Download PDFInfo
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- KR20030035697A KR20030035697A KR1020010068116A KR20010068116A KR20030035697A KR 20030035697 A KR20030035697 A KR 20030035697A KR 1020010068116 A KR1020010068116 A KR 1020010068116A KR 20010068116 A KR20010068116 A KR 20010068116A KR 20030035697 A KR20030035697 A KR 20030035697A
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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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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Abstract
Description
본 발명은 고강도 주석도금 강판의 제조방법에 관한 것으로, 특히 연속 소둔로의 통판성 확보와 함께 강판의 내식성, 내부식성을 향상시키고 스트레칭, 내꺽임성등 가공에 열화되지 않는 특성을 갖도록 한 시효성, 내부식성 및 내꺽임성이 우수한 고강도 주석도금 강판의 제조방법에 관한 것이다.The present invention relates to a method for manufacturing a high strength tin plated steel sheet, and in particular, to improve the corrosion resistance and corrosion resistance of the steel sheet, and to ensure the sintering characteristics of the continuous annealing furnace and to have characteristics such as stretching, bending resistance and the like not to deteriorate in processing It relates to a method for producing a high strength tin plated steel sheet excellent in corrosion resistance and bending resistance.
일반적으로 3-피스(piece) 캔(can) 용접관의 용기에는 주석이 도금된 조질도 MRT5(로크웰 경도 65±3HR30T이상)재가 널리 사용되고 있고 커피캔, 병뚜껑등 충분한 강도가 요구되는 용도에 사용하였으며, 0.18~0.20mm 칫수가 주종을 이루고 있다. 또한, 1회 압연, 연속소둔 방식에 의해 주로 제조되고 있으며, 이들 용접관은 내굽힘에 의한 원통가공으로 3-피스캔의 몸통부를 성형할 때 석도원판의 접힘 선상으로 발생하는 내 꺽임현상(flutting)이 우수해야 하나, 탄소가 높은 성분을 사용하므로 시효에 의한 좁은 겹침 용접시 꺽임 현상이 발생하여 캔의 생산성은 물론 캔 품질이 현저히 저하된다.Generally, tin-plated MRT5 (Rockwell hardness 65 ± 3HR30T) material is widely used in containers of three-piece can welded tubes and used for applications requiring sufficient strength such as coffee cans and bottle caps. 0.18 ~ 0.20mm dimension is the dominant type. In addition, it is mainly manufactured by one-time rolling and continuous annealing, and these weld pipes are formed in the bending line which is formed on the folded line of the stone plate when forming the trunk of the three-piece can by cylindrical processing by bending. ) Should be excellent, but because of the high carbon component, bending occurs during narrow overlap welding due to aging, which significantly reduces the productivity of the can as well as the can.
또한, 최근에는 이들 소재를 이용한 용기를 경량화하는 추세이며 이에 따라 보다 두께가 얇은 강판이 요구되고 있으나, 현재 적용중인 조질도 MRT5재는 탄소 함유량이 0.07~0.09%로 높으며, 여기에 다량(0.01%)의 질소를 첨가하여 질소의 고용강화를 통해 약 30~40ppm수준의 잔류 질소로 강판을 강화시켜 주문두께까지 냉간 압하율 90%이상으로 직접 압연함에 따라 냉간 압연 부하 발생 및 압연기 진동에 따른 진동흠(chartting mark) 결함을 유발시키고 있다.In addition, in recent years, a container using these materials is lighter, and accordingly, a thinner steel sheet is required. However, the currently applied crude MRT5 material has a high carbon content of 0.07 to 0.09%, and a large amount (0.01%). Nitrogen is added to strengthen the steel sheet with the residual nitrogen of about 30 ~ 40ppm level through the solid solution of nitrogen, and the steel sheet is directly rolled with the cold rolling reduction rate over 90% to the order thickness. mark) is causing a defect.
아울러 연속 소둔로에서 강판의 두께를 0.20mm 이하 초극박 두께를 제조 하는 것은 매우 어렵다. 강판의 두께가 얇을수록 연속 소둔로 통판시 판파단 및 주름(buckle)이 발생하는 등 문제가 발생하고 이에 따라 통판속도를 낮추고 생산성 저하 문제가 발생된다.In addition, it is very difficult to produce ultra-thin thickness of 0.20mm or less in the thickness of the steel sheet in the continuous annealing furnace. As the thickness of the steel sheet is thinner, problems such as plate breakage and buckles are generated during continuous annealing, and thus, lowering the plate speed and causing a problem in productivity reduction.
또한, 기존의 고경도 극박 석도강판 제조 방법으로 DR(DOUBLE REDUCTION) 방식에서는 탄소함유량 0.03~0.06%의 알루미늄 킬드강을 1차 냉간압연 및 소둔을 실시한 후 이를 2차 냉간압연을 통해 DR-8, DR-9(로크웰 경도 73±3, 76±3 HR30T)석도강판을 생산하나, 이는 표면에 많은 전위가 분포되어 산세시 표면 요철이 심하고 전위 도입량이 많음으로 주석도금 및 크로마이트 처리전 연신율이 급격히 저하되어 약간의 가공을 받는 부분 특히 스트레칭 가공을 받는 부분에 적용이 곤란해진다.In addition, in the conventional method of manufacturing high-strength ultra-thin grained steel sheet, in the DR (DOUBLE REDUCTION) method, aluminum cold-rolled steel is first cold-rolled and annealed with carbon content of 0.03 ~ 0.06%, and then the secondary cold-rolled DR-8, DR-9 (Rockwell hardness 73 ± 3, 76 ± 3 HR30T) produces sintered steel sheet, which has many dislocations on the surface, resulting in high surface irregularities during pickling and large amount of dislocations, resulting in rapid elongation before tin plating and chromite treatment. It falls and it becomes difficult to apply to the part which receives a little process especially a part which receives a stretch process.
본 발명은 상기한 종래 기술의 문제점을 해결하기 위하여 안출된 것으로서, 1회 압연 및 연속소둔 방식에 의한 제조방법을 탈피하여 연속 소둔로의 통판성을 확보하고, 강판의 내부식성을 향상시키며 스트레칭, 내꺽임성등 가공에 열화되지 않는 로크웰 경도 65±3 HR30T이상, 연신율 20% 이상, 시효지수 4Kg/㎟ 이하의 특성을 갖는 시효성, 내부식성 및 내꺽임성이 우수한 고강도 주석도금 강판의 제조방법을 제공함에 그 목적이 있다.The present invention has been made in order to solve the above problems of the prior art, to avoid the manufacturing method by the one-time rolling and continuous annealing method to ensure the flowability of the continuous annealing furnace, improve the corrosion resistance of the steel sheet, stretching, Rockwell hardness 65 ± 3 HR30T or more that does not deteriorate in processing such as bending resistance, elongation 20% or more, aging index 4Kg / mm2 The purpose is to provide.
도 1은 2차 조질 압하율에 따른 강의 경도변화를 나타낸 그래프도.1 is a graph showing the hardness change of the steel according to the secondary temper reduction rate.
도 2는 2차 조질 압하율에 따른 강의 연신율 변화를 나타낸 그래프도.Figure 2 is a graph showing the change in elongation of the steel according to the secondary roughing reduction rate.
도 3a는 2차 조질 압하율에 따른 강의 가열경화 변화를 나타낸 그래프도.Figure 3a is a graph showing the heat curing change of the steel according to the secondary roughing reduction rate.
도 3b는 2차 조질 압하율에 따른 강의 시효지수 변화를 나타낸 그래프도.Figure 3b is a graph showing the change in the aging index of the steel according to the secondary temper reduction rate.
도 4는 1, 2회 압연별 저탄소강의 주석도금 및 가공 파단 부위의 부식성 시험결과를 나타낸 사진도로서,Figure 4 is a photograph showing the corrosion test results of the tin plating of the low-carbon steel for each one and two times rolling and processing fracture,
도 4a는 일반적인 라인 생산품의 부식성 시험결과를 나타낸 사진도.Figure 4a is a photograph showing the corrosion test results of a typical line product.
도 4b는 2차 압하율 5%의 부식성 시험결과를 나타낸 사진도.Figure 4b is a photograph showing the corrosion test results of 5% secondary reduction rate.
도 4c는 2차 압하율 10%의 부식성 시험결과를 나타낸 사진도.Figure 4c is a photograph showing the corrosion test results of 10% secondary reduction rate.
상기한 과제를 실현하기 위한 본 발명에 따른 시효성, 내부식성 및 내꺽임성이 우수한 고강도 주석도금 강판의 제조방법은 중량 %로, C:0.04~0.07%, Mn:0.25∼0.35%, N:0.0050% 이하 첨가되고, 기타 불가피하게 함유되는 원소를 포함한 저탄소강을 통상의 방법으로 슬래브 재가열 균열 처리하고 열간 마무리 압연온도 570∼620℃의 범위에서 권취한 후, 통상의 방법으로 산세하고 86~90%의 냉간압하율 범위에서 냉간압연을 행하며, 온도 660℃ 이하 범위에서 소둔 및 조도 부여를위한 1.0~1.2% 범위내로 조질압연을 실시한 후, 이를 다시 2차 압하율 3~6% 범위에서 2차 압연을 실시하는 것을 특징으로 한다.The method for producing a high strength tin plated steel sheet excellent in aging, corrosion resistance, and bend resistance according to the present invention for realizing the above problems is weight%, C: 0.04 to 0.07%, Mn: 0.25 to 0.35%, N: Low carbon steel containing 0.0050% or less and other inevitably contained elements is subjected to slab reheat cracking in a conventional manner, wound up in a hot finishing rolling temperature of 570 to 620 ° C, and then pickled in a conventional manner to 86 to 90 Cold rolling is performed in the cold rolling reduction range of%, and temper rolling is carried out within the range of 1.0 ~ 1.2% for annealing and roughening at a temperature of 660 ℃ or lower, and then again in the secondary rolling ratio of 3-6%. It is characterized by rolling.
이하, 본 발명을 보다 상세하게 설명한다.Hereinafter, the present invention will be described in more detail.
본 발명은 연속소둔재의 1회 압연 석도 강판을 보다 두께가 얇고, 강도를 강하게 제조하는 방법으로써 3~6%의 조질 2차 압연을 실시하고, 표면에 형성된 적당한 량의 전위가 주석도금과 소지철 계면의 균질성을 강화시키고 내시효성을 억제하는 것을 통해 연속 소둔로상의 적당한 두께를 제조하고 그 이후 2차 압연에서 두께를 얇게 하여 적당량의 전위가 도입되어 강판의 내부식성이 우수할 뿐만 아니라 스트레칭 등의 가공에 열화되지 않는 극박 경질재 주석도금 강판을 제조함을 기술적 요지로 한다.The present invention is a method of producing a thinner and stronger strength of the one-time rolled stone steel sheet of the continuous annealing material to perform fine secondary rolling of 3 to 6%, and an appropriate amount of dislocations formed on the surface is tin-plated and possessed. By strengthening the homogeneity of the iron interface and suppressing the aging resistance, a suitable thickness on the continuous annealing furnace is manufactured, and after that, the thickness is reduced in the second rolling to introduce an appropriate amount of dislocation, thereby providing excellent corrosion resistance of the steel sheet and stretching, etc. The technical gist of the present invention is to manufacture an ultra-thin hard material tin plated steel sheet which does not deteriorate in processing.
본 발명에서 2차 압연 실시 목적이 기계적 성질의 열하가 적고 내식성을 얻으며, 내시효성을 확보함에 따라 CAN 가공중 꺽임이 발생하지 않는 2차 압하율의 범위를 3~6% 하여, 2차 압연에 의해 표면에의 전단면의 형성에 따라 염산과 같은 약산의 부식 분위기에서 균일한 표면 요철이 발달하여 석도금층과 소지철 기지의 조직간의 결합이 극대화하여 내식성을 확보되는 것이며, 또한 캔의 내시효성을 얻는 것은 저탄소강의 많은양의 고용탄소가 존재하지만 고용탄소보다 더많은 가동 전위를 2차압연에 의해 형성시킴으로 시효후에도 가동전위가 남아 있게 되어 내시효, 내꺽임성이 확보되는 것이다.In the present invention, the purpose of the secondary rolling is to achieve a low thermal degradation of mechanical properties, obtain corrosion resistance, and to ensure the aging resistance, the secondary reduction ratio of 3 to 6%, which does not cause bending during CAN processing, to secondary rolling. As a result of the formation of the shear surface on the surface, uniform surface irregularities develop in the corrosive atmosphere of weak acid such as hydrochloric acid, thereby maximizing the bonding between the plated layer and the base iron base structure to ensure corrosion resistance. What is obtained is that a large amount of solid carbon in low carbon steel exists, but more operating potential than that of solid carbon is formed by secondary rolling, so that the operating potential remains after aging, thereby ensuring aging resistance and bending resistance.
이에 따라 중량 %로, C:0.04~0.07%, Mn:0.25∼0.35%, N:0.0050% 이하 첨가되고, 기타 불가피하게 함유되는 원소를 포함한 저탄소강을 통상의 방법으로 재가열균열 처리하고 열간 마무리 압연온도 570∼620℃의 범위에서 권취한 후, 통상의 방법으로 산세하고 86~90%의 냉간압하율 범위에서 냉간압연을 행하며, 온도 660℃ 이하 범위에서 소둔 및 조도 부여를 위한 1.0~1.2% 범위내로 조질압연을 실시한 후, 이를 다시 2차 압하율 3~6% 범위에서 2차 압연을 실시함으로써 시효성, 내부식성 및 내꺽임성이 우수한 고강도 주석도금 강판의 제조방법을 제공할 수 있도록 하였다.As a result, low carbon steel containing C: 0.04 to 0.07%, Mn: 0.25 to 0.35%, N: 0.0050% or less, and other inevitably contained elements is reheat cracked and hot-rolled by a conventional method. After winding in the temperature range of 570 to 620 ° C., it is pickled by a conventional method and cold rolled in the cold reduction rate range of 86 to 90%, and in the range of 1.0 to 1.2% for annealing and roughness at a temperature of 660 ° C. or lower. After temper rolling inward, the secondary rolling was again performed in the secondary reduction ratio of 3 to 6% to provide a method for producing a high strength tin plated steel sheet having excellent aging resistance, corrosion resistance and bending resistance.
이하, 본 발명의 성분 조성 및 제조조건에 나타난 수치 한정이유를 설명한다.Hereinafter, the reason for numerical limitation shown in the component composition and manufacturing conditions of the present invention will be described.
본 발명에서는 초극박 주석도금 강판을 제조하기 위해 고압하에서의 냉간압연을 해야 함으로 탄소(C)의 함량을 너무 높일 수 없으며 조질도 MRT5의 강도 확보가 되는 0.04%를 탄소 함유의 하한으로 하고, 0.07%를 상한으로 하였다.In the present invention, the ultra-thin tin-plated steel sheet should be cold rolled under high pressure, so that the content of carbon (C) cannot be increased too much, and 0.04% for securing the strength of MRT5 is also defined as 0.07%. Was taken as the upper limit.
망간(Mn) 역시 강의 강도 향상에 기여하는 바가 크지만 열간압연시 입계편석에 의한 고온 취성방지 및 강도 상승을 위해 하한과 상한을 각각 0.25, 0.35%로 하였다.Manganese (Mn) also contributes to the strength improvement of the steel, but the lower limit and the upper limit are 0.25 and 0.35%, respectively, to prevent high temperature brittleness and increase the strength due to grain boundary segregation during hot rolling.
일반적으로 질소(C)는 탄소보다 대부분 먼저 석출되기 때문에 질소의 양이 많아지면 고용강화에 기여하는 바가 크기 때문에 냉간압연시 압연부하를 가중시키며, 또한 연속소둔의 경우 단시간 소둔처리를 하게 되어 질화물 및 탄화물을 형성시킬 충분한 시간이 없음으로 가급적 냉연전 즉 열연에서 석출시키는 것이 바람직하여 그 상한을 0.0050%이하로 하는 것이 경도 저하에 바람직 하다.In general, nitrogen (C) is precipitated before carbon most of the time, so if the amount of nitrogen increases, it contributes to the strengthening of solid solution. Therefore, the rolling load is increased during cold rolling, and in the case of continuous annealing, nitride and Since there is not enough time to form carbide, it is preferable to precipitate before cold rolling, ie hot rolling as much as possible, and to make the upper limit into 0.0050% or less preferable for hardness fall.
권취온도는 열연에서 가장 용이하게 석출물을 제어할 수 있고 또한 고온권취는 내식성의 열화의 원인이 되므로, 탄소, 질소가 충분히 석출될 수 있고, 내식성을 저하시키지 않는 범위 즉, 570~620℃ 조건을 설정하였다.Winding temperature can control the precipitate most easily in hot rolling, and high temperature winding causes the deterioration of corrosion resistance, so that carbon and nitrogen can be sufficiently precipitated, that is, the temperature does not degrade the corrosion resistance. Set.
이후 열연 작업 과정중 형성된 표층의 스케일을 통상의 방법으로 산세에 의해 제거하고 냉간압연을 하는데, 냉간압하율은 주석도금원판의 컵(cup)형상을 성형하는데 귀(ear) 발생에 많은 영향을 미치며, 탄소 함량 0.05% 수준함유시 냉간압하율은 86~90%의 수준이 귀 발생에 가장 유리한 것으로 나타났다.After that, the scale of the surface layer formed during the hot rolling process is removed by pickling in a conventional manner and cold rolled. The cold rolling rate greatly affects the occurrence of the ear in forming the cup shape of the tin-plated disc. In case of containing 0.05% of carbon content, the cold reduction rate of 86 ~ 90% was the most favorable for ear development.
상기와 같이 압연된 강판을 다시 통상의 방법과 같이 소둔하는데, 소둔온도는 재결정 온도 이상 660℃로 하였다. 만약 660℃이상을 초과하면 결정립 성장으로 인하여 경도 저하 발생으로 상한선을 660℃로 제한 하였다.The rolled steel sheet as described above was annealed in the same manner as in the usual method, but the annealing temperature was at least 660 ° C. for the recrystallization temperature. If the temperature exceeds 660 ℃, the upper limit is limited to 660 ℃ due to the decrease in hardness due to grain growth.
또한, 소둔완료된 강판의 조질 압연은 조도 부여, 형상교정, 기계적 성질 개선 목적으로 1.0~1.2% 수준 실시하여 주석도금 원판을 제조하나, 본 발명에서는 1회 압연재에 약한 2차 압하를 실시하면 가공성이 크게 저하되지 않고 가공경화에 의한 경도 확보가 될수 있다는 것을 밝혀내고 2차 압하율 상한선을 6%로 제한하였다. 2차 압하율 3% 미만에서는 가공경화가 크지 않고 목표하는 경도를 얻을 수 없기 때문에 하한선을 3%로 하였다.In addition, the tempered rolling of the annealed steel sheet is 1.0 to 1.2% level for the purpose of roughness, shape correction, mechanical properties improvement, to prepare a tin-plated master plate, in the present invention, if the second rolling is weakly applied to a single rolled material, workability It was found that the hardness could be secured by work hardening without being greatly reduced, and the upper limit of the secondary reduction ratio was limited to 6%. If the secondary reduction ratio is less than 3%, the work hardening is not large and the target hardness cannot be obtained, so the lower limit is set to 3%.
상기와 같이 압하율 3~6% 범위에서 2차압연을 실시한 극박 경질재 석도강판의 시효성, 내부식성 및 내꺽임성이 우수한 이유는 다음과 같이 설명된다.The reason why the aging, corrosion resistance and bending resistance of the ultra-thin hard material steel sheet subjected to the secondary rolling in the range of 3 to 6% reduction ratio as described above is explained as follows.
도 1은 경도에 미치는 2차 압하율의 영향도를 나타낸 것이고, 도 2는 동일 성분조건에서 연신율에 미치는 2차압하율의 영향을 나타낸 것이다.Figure 1 shows the effect of the secondary reduction rate on the hardness, Figure 2 shows the effect of the secondary reduction rate on the elongation under the same component conditions.
시험에 사용된 발명강은열연 권취온도 570℃, 냉간압하율 89.5%, 소둔온도650℃로 동일하지만 2차압하율을 변화시키면서 경도값 및 재질실적을 측정하였다.The invention steel used in the test was the same as the hot rolled coiling temperature of 570 ℃, cold rolling rate of 89.5%, annealing temperature of 650 ℃ but the hardness value and the material performance was measured while changing the secondary pressure reduction rate.
도 1에서 보는 바와 같이 2차 압하율을 증가하면 경도값은 증가됨을 알 수 있다. 따라서, 본 발명과 같이 고강도 초극박 석도강판인 MRT5(로크웰 경도 65±3 HR30T)를 확보하기 위해 0.05%C-0.30%Mn- 0.005%N의 강종의 경우 2차 압하율은 3~6%가 적정함을 알 수 있다. 이와 같이 2차 조질압하율에 의해 경도가 증가하는 것은 가공경화에 기인된 것이다.As shown in FIG. 1, it can be seen that as the secondary reduction ratio increases, the hardness value increases. Therefore, in order to secure MRT5 (Rockwell hardness 65 ± 3 HR30T), which is a high strength ultra-thin grained steel sheet as in the present invention, the secondary reduction ratio is 3-6% in the case of the steel grade of 0.05% C-0.30% Mn-0.005% N. It can be seen that it is appropriate. The increase in hardness due to the secondary temper reduction rate is attributable to work hardening.
또한, 도 2는 동일 성분 조건에서 연신율(Elogation)에 미치는 2차압하율의 영향을 나타낸 것으로 조질압하율이 7% 이상으로 되면 연신율이 급격히 감소됨을 알 수 있는데, 이는 강의 조직 내부에 까지 가공경화 현상이 일어남으로 연신율이 급격히 저하됨을 알 수 있다. 따라서 단순 드로잉하는 경우를 제외하고 8%이상의 2차 압하에 의해 가공용 극박 경질 석도강판을 제조하는 것은 무리가 있을 것으로 보인다.In addition, Figure 2 shows the effect of the secondary pressure on the elongation (Elogation) under the same component conditions, it can be seen that the elongation is rapidly reduced when the crude pressure is lower than 7%, which is the work hardening phenomenon even inside the steel structure It can be seen that the elongation decreases rapidly due to this occurrence. Therefore, except for simple drawing, it would be unreasonable to manufacture ultra-thin hard stone steel sheets for processing by secondary reduction of more than 8%.
도 3은 2차 압하율에 따른 압하율별 시효지수(A.I)와 가열경화(Bake Hardness)성을 나타낸 것으로 2차 압하율이 증가함에 따라 A.I 및 B.H는 감소되는 경향이 보이며 6%의 2차 압연율 부가시 A.I는 6Kgf/mm2에서 3.8Kgf/mm2으로 감소하였고, B.H는 9Kgf/mm2에서 4Kgf/mm2수준으로 저하하였다.Figure 3 shows the age index (AI) and the baking hardness (AI) according to the reduction ratio according to the secondary reduction rate, AI and BH tends to decrease as the secondary reduction ratio increases, the secondary rolling of 6% rate of addition during AI was reduced to 3.8Kgf / mm 2 in 6Kgf / mm 2, BH was lowered to 4Kgf / mm 2 level in 9Kgf / mm 2.
이와 같은 현상은 가공에 의해 증가된 전위수가 고착 분위기를 형성할 수 있는 입내 고용탄소량보다 많아지므로서 가동전위의 수가 증가된데 따른 결과이다. 상기한 여러 결론을 종합하여 볼 때 시효성 및 내꺽임성이 우수한 초극박 주석도금강판에 있어서 도 1 내지 도 3의 결과에 따라 2차 압하율은 3~60%가 목표 재질을 얻을 수 있는 본 발명의 범위로 타당함을 알 수 있다.This phenomenon is a result of the increase in the number of operating potentials as the number of dislocations increased by processing increases more than the amount of dissolved carbon in the mouth which can form a fixed atmosphere. According to the results of Figs. 1 to 3 in the ultra-thin tin-plated steel sheet having excellent aging and bending resistance in view of the above-mentioned conclusions, the secondary reduction ratio is 3 to 60%. It can be seen that it is valid within the scope of the invention.
이하, 실시예에 의거하여 본 발명을 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail based on Examples.
(실시예)(Example)
하기 표 1은 실험한 강의 성분실적, 열연 권취온도, 2차 조질압하율 및 재질실적을 나타낸 것으로 고주파 진공유도 용해로에서 용해한 강괴(두께 60mm , 폭 170mm, 길이 200mm)를 주조하여 1200℃에서 1시간 균질화 처리한후 압연 라인에서 두께 1.8t가 되도록 열간 압연을 하였다. 열간압연 마무리 온도는 Ar3 변태점이상 870℃ 이상으로 하였고, 열연 권취온도는 570℃로 미리 가열된 로에 1시간 유지후 로냉시키는 모사시험을 행했다.Table 1 shows the compositional performance, the hot rolling temperature, the secondary crude pressure reduction rate and the material performance of the tested steel and cast ingots (thickness 60mm, width 170mm, length 200mm) dissolved in a high frequency vacuum induction furnace for 1 hour at 1200 ° C. After the homogenization treatment, hot rolling was performed to a thickness of 1.8t in the rolling line. The hot rolling finish temperature was 870 degreeC or more above Ar3 transformation point, and the hot rolling temperature was hold | maintained in the furnace previously heated to 570 degreeC, and the simulation test which carried out the furnace cooling was done.
이후, 열연시료를 산세하여 고온 철산화물을 제거한 다음, 냉간압연 및 연속소둔하고, 이를 다시 1.2%의 조질압하하에 최종두께를 0.19mm가 되도록 하였다.Thereafter, the hot rolled sample was pickled to remove the high temperature iron oxide, followed by cold rolling and continuous annealing, and the final thickness was again 0.19 mm under a crude pressure of 1.2%.
표 1에 나타나듯이 비교강 1은 현장에서 적용중인 조질도 MRT5 강종과 유사한 것으로 탄소함량과 질소함량이 높고, 1회 조질 압하율 1.4%로 가하여 조질도 MRT5 재질 수준은 만족하지만, 탄소와 질소성분이 높아 냉간 압연시 89.5% 고압하 작업에 의한 압연부하를 야기 시켰고, 시효지수(A.I)가 7Kg/mm2로 캔 성형시 시효에의한 꺽임결함의 발생이 높다.As shown in Table 1, Comparative Steel 1 is similar to the MRT5 steel grade applied in the field, and has a high carbon content and nitrogen content, and a one-time crude rolling reduction ratio of 1.4% satisfies the MRT5 material level. This high rolling load caused 89.5% high-pressure rolling work during cold rolling, and the aging index (AI) was 7Kg / mm 2, and the occurrence of bending defects due to aging was high during can forming.
비교강 2의 경우 탄소함량을 0.03%로 낮추고, 냉간압연 및 연속소둔 후 조질 압하율을 8%로 높게 하면, MRT5 규격대비 하한수준으로 재질 수준은 만족하지만, 과다한 조질압연으로 인하여 연신율의 목표보다 낮은 19%수준으로 가공성이 미흡하다. 이와 더불어 연속소둔 라인의 특성상 1회 조질압하율을 너무 높게 적용하면 조질압연시 겹친 흠(pinch tree), 엣지 웨이브(edge wave), 판파단 발생등 문제를 발생시킨다.In the case of Comparative Steel 2, if the carbon content is lowered to 0.03% and the temper reduction rate after cold rolling and continuous annealing is increased to 8%, the material level is satisfied with the lower limit than the MRT5 standard, but due to excessive temper rolling, Low processability at 19%. In addition, if one temper reduction ratio is applied too high due to the characteristics of the continuous annealing line, problems such as pin tree, edge wave, and plate breaking occur during temper rolling.
비교강 3은 탄소 0.50%, 1회 조질압하율 1.2%로서 통상의 조질도 MRT4재 재질에 해당하는 경도 59.5HR 30T 수준과 재질 실적을 보인다.Comparative steel 3 is 0.50% of carbon and 1.2% of one temper reduction ratio, showing the level of hardness 59.5HR 30T and material performance, which is equivalent to that of ordinary MRT4 material.
한편, 본 발명에 따른 발명강 4,5는 도 1의 실험 결과로부터 알 수 있듯이 2차 압하를 가하여 가공경화 현상에 의한 경도를 증가시키는 것을 감안하여 통상의 조질도 MRT4재의 화학성분 및 제조조건인 비교강 3을 3%~6%의 2차 압하율로 가하면 경도실적이 63.5~65.5로 조질도 MRT5 목표경도를 만족하며 동시에 연신율 및 시효등 본 발명의 목표를 충분히 만족시키고 있다.On the other hand, the invention steels 4 and 5 according to the present invention, as can be seen from the experimental results of Figure 1 in consideration of increasing the hardness due to the work hardening phenomenon by applying the secondary pressure is the general composition of the chemical composition and manufacturing conditions of MRT4 material When the comparative steel 3 was added at a secondary reduction ratio of 3% to 6%, the hardness performance was 63.5 to 65.5, which satisfies the target hardness of the MRT5, and simultaneously satisfies the goals of the present invention such as elongation and aging.
비교강 6,7은 발명강 4와 같은 조성이지만 2차 압하율을 8~10% 가하면 목표경도는 확보할수 있지만, 연신율이 15~17% 수준으로 가공성이 미흡하다.Comparative steels 6 and 7 have the same composition as invention steel 4, but if the secondary reduction ratio is added to 8-10%, the target hardness can be secured, but the elongation is 15-17%, and the workability is insufficient.
한편, 도 4는 평면장출시험기를 통해 시편을 파단까지 변형시킨 후 염수분무 시험을 3시간 실시하여 녹발생 정도를 관찰한 결과로서 6% 까지 2차 압연을 실시한 발명강의 경우 염수분무후 적색의 녹이 거의 발생치 않았지만 비교강 1의 경우 적청을 많이 관찰할 수 있다.On the other hand, Figure 4 is a result of deforming the specimen to fracture through a planar elongation tester after performing a salt spray test for 3 hours to observe the degree of rust generation as a result of the secondary steel rolled to 6% in the case of the invention steel rust after salt spray Although rarely generated, in the case of Comparative Steel 1, a lot of red blue can be observed.
따라서 본발명과 같은 방법으로 고강도 초극박 주석도금 강판을 제조할 경우, 내식성이 크게 개선됨을 알 수 있다.Therefore, when manufacturing a high strength ultra-thin tin plated steel sheet by the same method as the present invention, it can be seen that the corrosion resistance is greatly improved.
상기한 바와 같은 본 발명의 시효성, 내부식성 및 내꺽임성이 우수한 고강도 주석도금 강판의 제조방법은 연속소둔재의 1회 압연 석도 원판에 대한 조질 2차 압연을 통해 강판의 표면에 형성된 적당한 량의 전위가 주석도금과 소지철 계면의 균질성 및 시효성을 향상시키고, 강판의 내부식성이 향상되는 효과가 있다.The method for producing a high strength tin plated steel sheet excellent in aging, corrosion resistance, and bend resistance of the present invention as described above is a suitable amount formed on the surface of the steel sheet through tempered secondary rolling on a single rolled stone disc of continuous annealing material. The dislocation of has an effect of improving the homogeneity and aging of the tin plating and the ferrous iron interface, and improving the corrosion resistance of the steel sheet.
또한, 시효후에도 가동전위가 남아 있게 되어 스트레칭등의 가공에 열화되지 않는 내꺾임성이 향상되는 효과가 있다.In addition, the movable potential remains even after aging, thereby improving the bending resistance not deteriorated in processing such as stretching.
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| KR101988773B1 (en) * | 2017-12-26 | 2019-06-12 | 주식회사 포스코 | Cold-rolled steel sheet having excellent anti-aging properties and workability, and manufacturing method thereof |
| CN110846569A (en) * | 2019-10-23 | 2020-02-28 | 首钢集团有限公司 | Low-carbon cold-rolled steel and preparation method and application thereof |
| WO2023121194A1 (en) * | 2021-12-21 | 2023-06-29 | 주식회사 포스코 | Cold-rolled steel sheet having excellent strength and elongation and method for manufacturing same |
| CN117327990A (en) * | 2023-10-14 | 2024-01-02 | 邯郸市金泰包装材料有限公司 | Scratch-resistant corrosion-resistant tin-plated iron for can body and manufacturing method thereof |
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| JPS55152129A (en) * | 1979-05-15 | 1980-11-27 | Nippon Kokan Kk <Nkk> | Preparation of hard tinned steel stock sheet by continuous annealing |
| JPS59113123A (en) * | 1982-12-17 | 1984-06-29 | Kawasaki Steel Corp | Production of ultra-hard extra-thin cold rolled steel sheet |
| JPH11124654A (en) * | 1997-08-18 | 1999-05-11 | Kawasaki Steel Corp | Steel sheet for can, and its production |
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| KR101988773B1 (en) * | 2017-12-26 | 2019-06-12 | 주식회사 포스코 | Cold-rolled steel sheet having excellent anti-aging properties and workability, and manufacturing method thereof |
| CN110846569A (en) * | 2019-10-23 | 2020-02-28 | 首钢集团有限公司 | Low-carbon cold-rolled steel and preparation method and application thereof |
| WO2023121194A1 (en) * | 2021-12-21 | 2023-06-29 | 주식회사 포스코 | Cold-rolled steel sheet having excellent strength and elongation and method for manufacturing same |
| CN117327990A (en) * | 2023-10-14 | 2024-01-02 | 邯郸市金泰包装材料有限公司 | Scratch-resistant corrosion-resistant tin-plated iron for can body and manufacturing method thereof |
| CN117327990B (en) * | 2023-10-14 | 2024-04-26 | 邯郸市金泰包装材料有限公司 | Scratch-resistant corrosion-resistant tin-plated iron for can body and manufacturing method thereof |
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