KR100716342B1 - The composition and its manufacturing process of martensite ultra-high strength cold rolled steel sheets - Google Patents
The composition and its manufacturing process of martensite ultra-high strength cold rolled steel sheets Download PDFInfo
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- KR100716342B1 KR100716342B1 KR1020050052686A KR20050052686A KR100716342B1 KR 100716342 B1 KR100716342 B1 KR 100716342B1 KR 1020050052686 A KR1020050052686 A KR 1020050052686A KR 20050052686 A KR20050052686 A KR 20050052686A KR 100716342 B1 KR100716342 B1 KR 100716342B1
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Abstract
본 발명은 마르텐사이트형 초고강도 냉연강판 조성물 및 이의 제조방법에 관한 것으로서, 종래의 고장력강판의 경우보다 강도를 높이기 위해 탄소, 실리콘 및 망간의 함량을 높이고, 강판의 냉간압연시 오스테나이트 영역에서 급냉하여 마르텐사이트 조직을 만든 마르텐사이트형 초고강도 냉연강판 조성물 및 이의 제조방법에 관한 것이다.The present invention relates to a martensite type ultra high strength cold rolled steel sheet composition and a method for manufacturing the same, to increase the strength of carbon, silicon and manganese in order to increase the strength of the conventional high tensile steel sheet, and quench in the austenite region during cold rolling of the steel sheet The present invention relates to a martensite type ultra high strength cold rolled steel sheet composition having a martensite structure and a method of manufacturing the same.
이를 위해, 본 발명은 탄소(C) 0.15∼0.30 중량%, 실리콘(Si) 0.3∼2.0중량%, 망간(Mn) 1.5∼4.0 중량%, 인(P) 0.03중량% 이하, 황(S) 0.01중량% 이하, 티타늄(Ti) 0.03∼0.06 중량%, 보론 0.0015∼0.0030 중량%를 포함하는 마르텐사이트형 초고강도 냉연강판 조성물과; 이 조성물이 용해된 강을 전로에서 용해시키고 연속주조한 후, 1100∼1300℃에서 열간압연을 실시하여 냉각하는 단계와; 통상의 압연조건으로 산세 및 냉간압연을 거친 다음, 3∼10℃/sec 로 승온하여 800∼850 ℃에서 소둔을 실시하는 단계와; 소둔 실시된 강을 30℃/sec 이상으로 급냉시키는 단계를 포함하는 것을 특징으로 하는 마르텐사이트형 초고강도 냉연강판의 제조방법을 제공한다.To this end, the present invention is 0.15 to 0.30% by weight of carbon (C), 0.3 to 2.0% by weight of silicon (Si), 1.5 to 4.0% by weight of manganese (Mn), 0.03% by weight or less of phosphorus (P), sulfur (S) 0.01 Martensitic type ultra high strength cold rolled steel sheet composition containing not more than% by weight, 0.03 to 0.06% by weight of titanium (Ti), and 0.0015 to 0.0030% by weight of boron; Dissolving the steel in which the composition is dissolved in a converter and continuously casting it, followed by cooling by performing hot rolling at 1100 to 1300 ° C; Pickling and cold rolling under normal rolling conditions, followed by heating to 3 to 10 ° C./sec and performing annealing at 800 to 850 ° C .; It provides a method for producing a martensitic type ultra high strength cold rolled steel sheet comprising the step of quenching the annealed steel at 30 ° C / sec or more.
초고강도 냉연강판, 마르텐사이트, 티타늄, 보론, 범퍼 보강재 Ultra high strength cold rolled steel, martensitic, titanium, boron, bumper reinforcement
Description
도 1은 본 발명의 냉연강판을 제조시, 냉간압연 및 소둔후 열처리 사이클을 보여주는 그래프.1 is a graph showing a heat treatment cycle after cold rolling and annealing during the production of the cold rolled steel sheet of the present invention.
본 발명은 마르텐사이트형 초고강도 냉연강판 조성물 및 이의 제조방법에 관한 것으로서, 더욱 상세하게는 종래의 고장력강판의 경우보다 강도를 높이기 위해 탄소, 실리콘 및 망간의 함량을 높이고, 강판의 냉간압연시 오스테나이트 영역에서 급냉하여 마르텐사이트 조직을 만든 마르텐사이트형 초고강도 냉연강판 조성물 및 이의 제조방법에 관한 것이다.The present invention relates to a martensitic type ultra high strength cold rolled steel sheet composition and a method for manufacturing the same, and more particularly, to increase the strength of carbon, silicon and manganese in order to increase the strength of a high tensile steel sheet, and to obtain austenite during cold rolling of a steel sheet. It relates to a martensite type ultra high strength cold rolled steel sheet composition which is quenched in the night region to make martensite structure, and a method of manufacturing the same.
현재 널리 적용되고 있는 자동차부품용 고장력강판은 인장강도가 340MPa 에서 590MPa정도의 강판을 사용하고 있으며, 대한민국 공개특허공보 10-1997-0059126 에는 고연성 60킬로그램급 냉간압연강판의 제조방법이 개시되어 있다.High tensile steel sheet for automotive parts, which is widely applied at present, uses a steel sheet having a tensile strength of about 340 MPa to 590 MPa, and Korean Patent Laid-Open Publication No. 10-1997-0059126 discloses a method for manufacturing a high ductility 60 kg cold rolled steel sheet. .
그러나, 이와 같은 종래의 강판은 고장력 강판으로서는 낮은 등급의 것으로서 자동차부품에 적용되더라도 경량화를 조금밖에 이룰 수 없게 된다.However, such a conventional steel sheet is of a low grade as a high tensile strength steel sheet, so that even if it is applied to automobile parts, the weight reduction can be achieved only a little.
따라서, 강판의 강도를 획기적으로 높여 자동차부품의 경량화를 극대화할 수 있는 새로운 고강도강판의 제조방법에 대한 개발 필요성이 절실히 대두되고 있는 실정에 있다.Therefore, there is an urgent need for development of a method for manufacturing a new high strength steel sheet capable of maximizing the weight reduction of automobile parts by dramatically increasing the strength of the steel sheet.
이에, 본 발명의 발명자는 상기와 같은 문제점을 해결하기 위하여 연구 노력한 결과, 강판내에 강도를 높이기 위해 탄소, 실리콘 및 망간의 함량을 높이고, 티타늄과 보론을 첨가한후, 강판의 냉간압연시 오스테나이트 영역에서 급냉하여 마르텐사이트 조직을 가진 초고강도 냉연강판을 제조할 수 있었고, 물론 범퍼 레일 등의 보강재 부품에 적용시 경량화 효과도 함께 가져올 수 있음을 확인함으로써, 본 발명을 완성하였다.Therefore, the inventors of the present invention have been researched to solve the above problems, as a result of increasing the content of carbon, silicon and manganese in order to increase the strength in the steel sheet, after adding titanium and boron, austenite during cold rolling of the steel sheet The present invention was completed by confirming that it was possible to manufacture an ultra-high strength cold rolled steel sheet having a martensite structure by quenching in the region, and of course, to bring a weight reduction effect when applied to reinforcement parts such as bumper rails.
결국, 본 발명의 주된 목적은 탄소(C) 0.15 내지 0.30 중량%, 실리콘(Si) 0.3 내지 2.0중량%, 망간(Mn) 1.5 내지 4.0 중량%, 인(P) 0.03중량% 이하, 황(S) 0.01% 이하, 티타늄(Ti) 0.03 내지 0.06 중량%, 보론 0.0015 내지 0.0030%를 포함하는 마르텐사이트형 초고강도 냉연강판 조성물 및 이의 제조방법을 제공하는데 있다.After all, the main object of the present invention is 0.15 to 0.30% by weight of carbon (C), 0.3 to 2.0% by weight of silicon (Si), 1.5 to 4.0% by weight of manganese (Mn), 0.03% by weight or less of phosphorus (P), sulfur (S) ) 0.01% or less, titanium (Ti) 0.03 to 0.06% by weight, boron 0.0015 to 0.0030% to provide a martensitic type ultra high strength cold rolled steel sheet composition and a method of manufacturing the same.
이하, 본 발명의 초고강도 냉연강판 조성물 및 이의 제조방법에 대하여 보다 구체적으로 살펴보기로 한다.Hereinafter, the ultra high strength cold rolled steel sheet composition of the present invention and a manufacturing method thereof will be described in more detail.
본 발명에 따른 초고강도 냉연강판의 조성물은 탄소(C) 0.15∼0.30 중량%, 실리콘(Si) 0.3∼2.0중량%, 망간(Mn) 1.5∼4.0 중량%, 인(P) 0.03중량% 이하, 황(S) 0.01중량% 이하, 티타늄(Ti) 0.03∼0.06 중량%, 보론 0.0015∼0.0030 중량%를 포함하여 이루어진 것을 특징으로 한다.The composition of the ultra-high strength cold rolled steel sheet according to the present invention is 0.15 to 0.30% by weight of carbon (C), 0.3 to 2.0% by weight of silicon (Si), 1.5 to 4.0% by weight of manganese (Mn), 0.03% by weight or less of phosphorus (P), Sulfur (S) 0.01% by weight or less, titanium (Ti) 0.03 to 0.06% by weight, characterized in that consisting of 0.0015 to 0.0030% by weight of boron.
이러한 강판의 성분 조성에 대한 수치 한정 이유를 설명하면 다음과 같다.The reason for numerical limitation on the composition of components of such a steel sheet is as follows.
1) 탄소(C) 0.15∼0.30 중량%1) 0.15 to 0.30 wt% of carbon (C)
탄소는 강판의 강도를 증가시키는 주요 원소로서, 0.15 중량% 이하이면 결정립이 성장할 뿐만아니라 탄소에 의한 고용강화 효과와 석출강화 효과가 적기 때문에 충분한 인장강도를 확보할 수 없고, 특히 강판의 용접성 저하를 일으키게 된다.Carbon is the main element to increase the strength of steel sheet. If it is 0.15% by weight or less, not only grains grow but also the solid-solution strengthening effect and precipitation strengthening effect by carbon are not sufficient, and thus sufficient tensile strength cannot be secured. Will be raised.
반면에, 0.30 중량%를 초과하게 되면 항복강도 및 인장강도가 크게 증가하므로 가공성이 나빠지게 된다.On the other hand, if the content exceeds 0.30% by weight, the yield strength and tensile strength increase greatly, resulting in poor workability.
따라서, 탄소의 첨가량 0.15∼0.30 중량%로 제한하는 것이 바람직하다.Therefore, it is preferable to limit the addition amount of carbon to 0.15 to 0.30 wt%.
2) 실리콘(Si) 0.3∼2.0중량%2) 0.3 ~ 2.0% by weight of silicon (Si)
실리콘은 치환형 고용체로서, 강판의 강도를 증대시키기 위하여 0.3중량%로 첨가하는 것이 좋고, 취성방지를 위하여 2.0중량% 이하로 첨가시키는 것이 바람직하다.Silicon is a substitutional solid solution, it is preferable to add 0.3% by weight in order to increase the strength of the steel sheet, and to add 2.0% by weight or less to prevent brittleness.
3) 망간(Mn) 1.5∼4.0 중량%3) Manganese (Mn) 1.5-4.0 wt%
망간은 강 중에 존재하는 황의 유해함을 방지하기 위해, 그리고 치환형 고용체로서 강판의 강도를 증가시키는 효과가 있어 첨가하는 것으로서, 충분한 인장강도 확보를 위하여 1.5중량% 이상 첨가하는 것이 좋고, 만일 4.0 중량%를 초과하는 경우에는 성형성이 떨어지는 문제점이 있으므로, 그 첨가 함량을 1.5∼4.0 중량%로 제한하였다.Manganese is added to prevent the harmfulness of sulfur present in the steel and to increase the strength of the steel sheet as a substituted solid solution. It is preferable to add 1.5% by weight or more to secure sufficient tensile strength. If it exceeds%, there is a problem inferior moldability, the addition content was limited to 1.5 to 4.0% by weight.
4) 인(P) 0.03중량% 이하4) Phosphorus (P) 0.03 wt% or less
인(P)은 강 중에 존재시 성형성을 저하시키고 입계에 석출하여 연성취성 천이온도를 높여 충돌강도를 떨어뜨리므로 0.03 중량%이하로 제한하는 것이 바람직하다.Phosphorus (P) is preferably limited to 0.03% by weight or less since it degrades formability when present in steel and precipitates at grain boundaries to increase ductile brittle transition temperature to lower impact strength.
5) 황(S) 0.01중량% 이하5) Sulfur (S) 0.01 wt% or less
황(S)은 강의 제조시 불가피하게 함유되는 원소로서, 강 중에 존재시 취성을 일으키므로 황의 성분범위를 좁게 관리할수록 안정된 소부경화량을 얻을 수 있다.Sulfur (S) is an element that is inevitably contained in the production of steel, and when present in the steel, brittleness occurs, so that the narrower cured amount of hardening can be obtained as the sulfur component range is managed narrower.
이에, 황의 함량을 0.01% 이하로 제한하는 것이 바람직하다.Therefore, it is preferable to limit the content of sulfur to 0.01% or less.
6) 티타늄(Ti) 0.03∼0.06 중량%6) 0.03 to 0.06 wt% of titanium (Ti)
티타늄(Ti)은 강중에 존재시 탄소와 결합하여 탄화물을 만들면서 강판의 강도를 높이므로 0.03 중량% 이상 첨가하는 것이 바람직하고, 과도하게 존재시 성형성을 크게 떨어뜨리므로 0.06 중량% 이하로 제한하는 것이 좋다.When titanium (Ti) is present in steel, it is preferable to add 0.03% by weight or more because it combines with carbon to make carbides, thereby increasing the strength of the steel sheet. Good to do.
7) 보론 0.0015∼0.0030 중량%7) Boron 0.0015 ~ 0.0030 wt%
보론은 가장 경제적으로 소입성을 향상시킬 수 있는 필수성분으로서, 그 첨가량은 0.0015 내지 0.0030중량%가 바람직하다.Boron is the most economically essential ingredient that can improve the hardenability, the amount of addition is preferably 0.0015 to 0.0030% by weight.
그 이유는 소재 내의 보론량이 0.0015 중량% 미만으로 첨가되면 충분한 소입성 향상 효과를 얻을 수 없으며, 0.0030중량%를 초과하여 첨가되면 보론 화합물 형성에 기인한 열간 취성이 나타내기 때문이다.The reason is that when the amount of boron in the material is added at less than 0.0015% by weight, sufficient hardenability improvement effect cannot be obtained, and when it is added in excess of 0.0030% by weight, hot brittleness due to the formation of boron compounds is exhibited.
이러한 조성으로 본 발명의 초고강도 냉연강판을 제조하는 방법을 설명하면 다음과 같다.Referring to the method of manufacturing the ultra-high strength cold rolled steel sheet of the present invention with such a composition as follows.
첨부한 도 1은 본 발명의 냉연강판을 제조시, 냉간압연 및 소둔후 열처리 사이클을 보여주는 그래프이다.1 is a graph showing a heat treatment cycle after cold rolling and annealing during the production of the cold rolled steel sheet according to the present invention.
상기와 같은 조성으로 용해된 강을 전로에서 용해시키고 연속주조한 후, 1100∼1300℃에서 열간압연을 실시하여 냉각하는 단계와; 통상의 압연조건으로 산세 및 냉간압연을 거친 다음, 3∼10℃/sec 로 승온하여 800∼850 ℃에서 소둔을 실시하는 단계와; 소둔 실시된 강을 30℃/sec 이상으로 급냉시키는 단계를 통하여 본 발명의 초고강도 냉연강판이 제조된다.Dissolving the molten steel in the composition as described above in a converter and continuously casting, followed by cooling by performing hot rolling at 1100 to 1300 ° C .; Pickling and cold rolling under normal rolling conditions, followed by heating to 3 to 10 ° C./sec and performing annealing at 800 to 850 ° C .; The ultra-high strength cold rolled steel sheet of the present invention is manufactured by quenching the annealed steel at 30 ° C / sec or more.
이때, 강판의 조직을 오스테나이트로 만들기 위해 소둔을 실시하는데, 소둔 온도가 800℃ 이하에서는 초석 페라이트가 발생하여 강도 저하의 우려가 있으며, 강판 결정입자의 성장을 막기 위해 850℃ 이하로 제한한다.At this time, annealing is carried out to make the structure of the steel sheet into austenite, but the annealing temperature is 800 ° C or lower, and there is a fear of a decrease in strength due to the formation of cornerstone ferrite.
또한, 상기 소둔으로 강판의 조직이 오스테나이트로 변태된 후, 초당 30℃ 이상의 급속냉각을 통하여 강판의 전 조직을 마르텐사이트로 제조하여 강도를 향상시키는 것이다.In addition, after the annealing of the steel sheet is transformed into austenite, the entire structure of the steel sheet is made of martensite through rapid cooling of 30 ° C. or more per second to improve strength.
이하, 본 발명을 실시예에 의하여 더욱 상세히 설명하고자 한다.Hereinafter, the present invention will be described in more detail with reference to Examples.
하기의 실시예는 단지 본 발명을 보다 구체적으로 설명하기 위한 것으로, 본 발명의 범위가 실시예에 한정되지 않는다는 것은 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 있어서 자명할 것이다.The following examples are only intended to illustrate the present invention in more detail, it will be apparent to those skilled in the art that the scope of the present invention is not limited to the examples.
실시예 1Example 1
탄소(C) 0.22중량%, 실리콘(Si) 0.85중량%, 망간(Mn) 2.85중량%, 인(P) 0.012중량%, 황(S) 0.003중량%, 티타늄(Ti) 0.045중량%, 보론 0.0025중량%를 포함하는 조성을 전술한 냉연강판의 제조방법에 의하여 시편으로 제작하였다.0.22% by weight of carbon (C), 0.85% by weight of silicon (Si), 2.85% by weight of manganese (Mn), 0.012% by weight of phosphorus (P), 0.003% by weight of sulfur (S), 0.045% by weight of titanium (Ti), boron 0.0025 The composition containing the weight% was prepared as a specimen by the method for producing a cold rolled steel sheet described above.
실시예 2Example 2
탄소(C) 0.24중량%, 실리콘(Si) 0.68중량%, 망간(Mn) 3.13중량%, 인(P) 0.008중량%, 황(S) 0.002중량%, 티타늄(Ti) 0.042중량%, 보론 0.0028중량%를 포함하는 조성을 전술한 냉연강판의 제조방법에 의하여 시편으로 제작하였다.0.24% by weight of carbon (C), 0.68% by weight of silicon (Si), 3.13% by weight of manganese (Mn), 0.008% by weight of phosphorus (P), 0.002% by weight of sulfur (S), 0.042% by weight of titanium (Ti), boron 0.0028 The composition containing the weight% was prepared as a specimen by the method for producing a cold rolled steel sheet described above.
비교예 1 및 2Comparative Examples 1 and 2
비교예로서, 티타늄과 보론이 함유되지 않은 기존의 강판 조성을 전술한 제조 방법에 의거 전로에서 용해시키고 연속주조한 후 열간압연, 냉각, 산세, 냉간압연, 소둔 및 냉각을 실시하여 시편 제작하였다.As a comparative example, specimens were prepared by dissolving a conventional steel sheet composition containing no titanium and boron in a converter according to the above-described manufacturing method and performing continuous casting followed by hot rolling, cooling, pickling, cold rolling, annealing and cooling.
실험예Experimental Example
상기 실시예 및 비교예에 따른 시편 강판에 대하여 항복강도, 인장강도, 신율을 측정하였으며, 그 결과는 다음 표 1에 나타낸 바와 같다.Yield strength, tensile strength, and elongation were measured for specimen steel plates according to Examples and Comparative Examples, and the results are shown in Table 1 below.
이때, 측정 방법은 실시예 및 비교예에 따른 강판을 KS5호의 인장시험편을 만들고, 25톤 쯔빅인장시험기를 사용하여 20㎜/분의 속도로 인장시험함으로써, 항복강도, 인장강도, 신율을 측정할 수 있었다.At this time, the measuring method is to make a tensile test piece of KS5 No. according to the Examples and Comparative Examples, and by using a 25 ton TZBIC tensile tester at a rate of 20 mm / min, yield strength, tensile strength, elongation can be measured Could.
위의 표 1에서 보는 바와 같이, 본 발명에 따른 냉연강판(실시예)이 기존의 냉연강판(비교예)에 비하여, 항복강도 및 인장강도가 월등히 향상되었음을 알 수 있었다.As shown in Table 1 above, it can be seen that the cold rolled steel sheet according to the present invention (example) is significantly improved in yield strength and tensile strength compared to the conventional cold rolled steel sheet (comparative example).
이상에서 본 바와 같이, 본 발명에 따른 마르텐사이트형 초고강도 냉연강판 조성 및 이의 제조방법에 의하면, 종래의 고장력강판의 경우보다 강도를 높이기 위해 탄소, 실리콘 및 망간의 함량을 높이고, 강판의 냉간압연시 오스테나이트 영역에서 급냉하여 마르텐사이트 조직을 만들어줌으로써, 강판은 신율은 저하되지만 강판의 강도를 월등히 향상시킬 수 있다.As seen above, according to the martensitic type ultra high strength cold rolled steel sheet composition and manufacturing method thereof according to the present invention, in order to increase the strength than the conventional high tensile steel sheet, to increase the content of carbon, silicon and manganese, cold rolling of the steel sheet By quenching in the austenite region to create martensite structure, the elongation of the steel sheet is reduced, but the strength of the steel sheet can be improved significantly.
강판의 강도 향상에 따라, 이를 범퍼 보강재에 적용시킬 경우 15% 이상의 경량화 효과를 얻을 수 있다.As the strength of the steel sheet is improved, when it is applied to the bumper reinforcement, a weight reduction effect of 15% or more can be obtained.
범퍼 보강재는 굽힘가공에 의한 성형으로 제작되므로, 5% 이상의 신율을 가진 본 발명의 마르텐사이트형 초고강도 냉연강판도 용이하게 적용할 수 있다.Since the bumper reinforcement is manufactured by molding by bending, the martensite type ultra high strength cold rolled steel sheet of the present invention having an elongation of 5% or more can be easily applied.
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| US10294541B2 (en) | 2013-12-23 | 2019-05-21 | Posco | Quenched steel sheet having excellent strength and ductility |
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