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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 28. Отображено 28.
27-10-2016 дата публикации

FORM APPARATUS FOR MANUFACTURING CURVED PRETENSIONED PRECAST CONCRETE GIRDER, AND MANUFACTURING METHOD OF CURVED PRETENSIONED PRECAST CONCRETE GIRDER USING SAME

Номер: KR101669433B1
Принадлежит: KRRI, GS ENGINEERING & CONSTRUCTION CORP.

The present invention relates to a form apparatus for manufacturing a curved precast concrete girder wherein longitudinal prestressing is introduced by a pretension method and a longitudinal planar line shape is curved, and a manufacturing method of a girder using the same. According to the present invention, the form apparatus comprises a pair of side form plates (20a, 20b) and an end form plate (10). A through hole (11) penetrated by a tendon (1) is formed on the end form plate (10). A direction changing saddle member (2) is integrated with and installed on a longitudinal outer surface of the end form plate (10) while a curved end toward the through hole (11) protrudes to be inserted into the through hole (11). When the tendon (1) passing through the through hole (11) is pulled and tensioned by both ends, the tendon (1) is tightly attached to an end consisting of a curved surface of the direction changing saddle member (2) and bent into a curved shape based on curvature of the end of ...

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09-06-2015 дата публикации

PERMANENT FORM AND CONSTRUCTION METHOD FOR COPING

Номер: KR0101526889B1

... 본 발명은 내부에 철근의 배근 및 콘크리트 타설공간의 형성을 위한 외벽(111) 및 바닥판(112)을 구비한 박스형 구조의 본체(110); 교각(10)과의 결합을 위하여 상기 바닥판(112)에 형성된 교각결합부(11); 중앙부가 상기 바닥판(112)에 매설됨과 아울러, 양단부가 상기 외벽(111)에 수직방향으로 매설된 매설철근(120); 상기 매설철근(120)과 현장조립철근(20)의 결합을 위하여, 상기 매설철근(120) 및 외벽(111)에 형성된 철근결합부(200);를 포함하는 코핑 시공용 영구거푸집(100)을 제시함으로써, 접근성이 취약한 교각의 상부에 설치되는 구조라 하더라도, 고비용의 대형 장비가 필요 없고, 운반 및 설치작업의 위험이 작으며, 작업이 용이하도록 한다.

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26-10-2015 дата публикации

INTEGRAL CROSS SLOT AND HEXAGON SCREWDRIVER

Номер: KR1020150119645A
Автор: KIM, DO HAK
Принадлежит:

The present invention relates to an integral cross slot, and a hexagon screwdriver. The integral cross slot and hexagon screwdriver comprises: a first body (200) having a first accommodating space (110) therein, and a linear hexagon wrench (100) wherein a hexagon bit with a through hole of a hexagon pillar form is formed on one end; a second body (300) including a second accommodating space (310) of which one side is open, a spring (320) of which one end is fixated to an inner bottom of the second accommodating space (310), and a slide holder (330) wherein one side is connected to an other end of the spring (320), inserted and moved into the second accommodating space (310), and the other side having a groove; and a cross slot screwdriver (400) having a first body insertion unit (410) having a cross slot bit on one end and inserted and accommodated in the first accommodating space (110), and a second body insertion unit (420) inserted and accommodated in the slide holder (330) and integrally ...

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13-05-2015 дата публикации

ADJUSTABLE END STRUCTURE OF PRECAST PIER AND PRECAST PIER CONSTRUCTION METHOD USING SAME

Номер: KR1020150051503A
Принадлежит:

According to the present invention, provided are an adjustable end structure of a precast pier, comprising: an adjustable end block (300) which is installed at a predetermined distance from the top of a foundation pile (100) and on the top of which a pier segment (200) is stacked; and a support frame (400) to support the adjustable end block (300) at a predetermined distance from the foundation pile (100) and a precast pier construction method using the same. COPYRIGHT KIPO 2015 ...

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25-01-2016 дата публикации

INTERMODAL SYSTEM INCLUDING MOVING SECTION

Номер: KR0101587851B1
Принадлежит: 지에스건설 주식회사

... 본 발명에 따르면, 차량(1)이 적재되는 적재공간(2)이 구비된 열차에 있어서, 상기 차량(1)이 상기 적재공간(2)으로 출입되기 위한 출입구(100); 및 상기 차량(1)이 상부에 주차된 상태에서 상기 적재공간(2)과 열차가 정차된 플랫폼(3) 사이를 왕복하는 이동부(200);를 포함하는 것을 특징으로 하는 차량 적재용 열차가 제공된다. 본 발명에 따르면 열차의 도착 전이라도 이동부가 구비된 일정한 주차구역에 차량을 주차할 수 있도록 함으로써, 차량의 적재 준비를 시작할 수 있도록 하여 차량 적재에 소요되는 시간을 최소화할 수 있는 효과가 있다.

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10-01-2013 дата публикации

METHOD FOR CONSTRUCTING AN EXTENDABLE CABLE-STAYED GIRDER BRIDGE HAVING A SINGLE SPAN

Номер: WO2013005877A1
Принадлежит:

Provided is a method for constructing an extendable cable-stayed girder bridge having a single span. In the cable-stayed girder bridge having the single span in which a girder is hung between both main towers (a main span) using a stayed cable, a construction process for converting a compression force applied to the girder to an elongation force is performed to more economically construct the cable-stayed girder bridge. According to the construction process, deck segments hung at a central portion of the main span by the stayed cable and affected by the compression force are rigidly coupled and connected to each other using key segments and jacks, and then the compression force is offset by a tensile force generated between the deck segments connected to each other while the jacks are removed.

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25-06-2020 дата публикации

PRECAST COLUMN AND FOUNDATION CONNECTION STRUCTURE, AND PRECAST COLUMN CONSTRUCTION METHOD USING SAME

Номер: WO2020130206A1
Принадлежит:

Provided, according to the present invention, is a column and foundation connection structure comprising a precast column (1) and a foundation (2), the column and foundation connection structure comprising: column embedded reinforcing bars (100) embedded in a column (1); foundation embedded reinforcing bars (200) each having one portion thereof embedded in a foundation (2) and the upper end portion (210) thereof exposed; and connection parts (300) for integrating the column embedded reinforcing bars (100) and the foundation embedded reinforcing bars (200), wherein the connection parts (300) are formed at an end portion of the column (1), and each comprise a lead-in space (310) in which the upper end portion (210) is inserted. According to the present invention, an effect is achieved whereby construction time may be reduced, and safety in construction may be increased.

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03-07-2018 дата публикации

반력빔의 하단배치 및 거푸집 일체형 구조를 가지는 이동식 프리텐션 콘크리트 부재 제작장치 및 이를 이용한 프리텐션 콘크리트 부재의 제작방법

Номер: KR0101873335B1

... 본 발명은 거더 등과 같은 콘크리트 부재에 미리 프리스트레스를 도입함으로써 프리텐션 콘크리트 부재를 제작함에 있어서, 프리스트레스 도입 과정에서 발생하는 반력을 지지할 수 있는 반력빔이 프리텐션 콘크리트 부재의 성형을 위한 거푸집의 하부에 설치되어 있는 구조를 가지고 있어서, 자유롭게 이동 설치하여 이용할 수 있으며, 프리텐션 콘크리트 부재의 제작에 소요되는 부지의 규모를 축소시켜서 부지확보 비용을 줄이고 그에 따라 프리텐션 콘크리트 부재의 제작비용을 크게 절감할 수 있게 하는 "프리텐션 콘크리트 부재의 제작장치 및 이를 이용한 프리텐션 콘크리트 부재의 제작방법"에 관한 것이다.

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05-04-2017 дата публикации

일체형 돌기가 구비된 궤도구조물 및 이의 시공방법

Номер: KR0101723131B1

... 본 발명에 따르면, 돌기 수용홈(110)이 형성된 하부구조물(100); 상기 하부구조물(100) 상부에 형성되며 상기 돌기 수용홈(110)에 수용되는 돌기(210)가 형성된 노반 콘크리트(200); 및 상기 노반 콘크리트(200) 상부에 형성되며, 레일(500) 및 상기 레일(500)과 체결된 침목(400)을 지지하는 도상(300);을 포함하는 것을 특징으로 하는 궤도구조물이 제공된다. 본 발명에 따르면 하부구조물과 노반콘크리트의 일체화를 통해 궤도구조물의 안정성을 향상시킬 수 있는 효과가 있다.

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25-04-2018 дата публикации

CONNECTION STRUCTURE FOR PRECAST BEAM AND COLUMN AND CONSTRUCTION METHOD FOR CONNECTING BEAM AND COLUMN BY USING SAME

Номер: KR1020180042007A
Принадлежит:

The present invention provides a connection structure for a precast beam (1) and a column (2). According to the present invention, the connection structure for the precast beam (1) and the column (2) includes a connection unit (100) formed at an end of the beam (1). The connection unit (100) includes: an exposure unit (110) formed in a stepped form at the end of the beam (1); a first connection reinforcing bar (120) wherein a part of the first connection reinforcing bar (120) is embedded in the beam (1) and the rear part is exposed to the exposure unit (110); and a first connection plate (130) connected to the first connection reinforcing bar (120) and connected to a second connection plate (230) exposed to the surface of the column (2) by a bolt. According to the present invention, the connection structure for the precast beam (1) and the column (2) can improve construction safety and can reduce construction periods. COPYRIGHT KIPO 2018 ...

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19-11-2015 дата публикации

TRAIN FOR LOADING VEHICLE INCLUDING MOVING UNIT AND MOVING METHOD FOR VEHICLE USING SAME

Номер: KR1020150129212A
Принадлежит:

According to the present invention, provided is a train for loading a vehicle, which has a loading space (2) wherein a vehicle (1) is loaded, comprises: an entrance (100) for the vehicle (1) to enter the loading space (2); and a moving unit (200) reciprocally moving between the loading space (2) and a platform (3) wherein a train is stopped in a state that the vehicle (1) is parked in an upper portion. According to the present invention, a vehicle can be parked in a predetermined parking area having a moving unit even if a train does not arrive, thereby minimizing time required for loading a vehicle by enabling preparation to load a vehicle. COPYRIGHT KIPO 2016 ...

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16-06-2015 дата публикации

PRECAST BUIT-UP PIER STRUCTURE AND CONSTRUCTION METHOD USING THE SAME

Номер: KR0101527471B1

... 본 발명에 따르면, 기초 말뚝(100)의 상부에 일정간격 이격되어 설치되며, 상부에 프리캐스트 교각 세그먼트(200)가 적층되는 조정단 블록(300) 및 상기 조정단 블록(300)을 상기 기초 말뚝(100)에서 일정 간격 이격된 상태로 지지하는 지지 프레임(400)을 포함하는 것을 특징으로 하는 프리캐스트 교각의 조정단 구조 및 이를 이용하여 프리캐스트 교각을 시공하는 방법이 제공된다.

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26-04-2018 дата публикации

CONNECTION STRUCTURE OF PRECAST BEAM AND COLUMN AND METHOD FOR CONNECTING BEAM AND COLUMN BY USING SAME

Номер: WO2018074814A1
Принадлежит:

Provided according to the present invention is a connection structure of a precast beam (1) and a precast column (2), the connection structure comprising a coupling part (100) formed at the end of the beam (1), wherein the coupling part (100) comprises: an exposure part (110) in a stepped shape at an end of the beam (1); a first connection rebar (120), a part of which is buried in the beam (1) with the remaining part thereof exposed to the exposure part (110); and a first coupling plate (130) coupled to the first connection rebar (120) and bolt-coupled to a second coupling plate (230) exposed from a surface of the column (2). The present invention has the effect of reducing a construction time and improving construction safety.

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04-01-2019 дата публикации

테일러 웰디드 블랭크용 강재 및 이를 이용한 핫 스탬핑 부품의 제조방법

Номер: KR1020190001492A
Принадлежит:

... 본 발명의 일 관점에 따르면, 탄소(C): 0.04~0.06 중량%, 망간(Mn): 1.2~1.5 중량%, 티타늄(Ti): 0.01~0.10 중량%, 니오븀(Nb): 0.01~0.10 중량% 및 잔부의 철(Fe)과 불가피한 불순물을 포함하고, 인장강도(TS): 550 MPa 이상, 항복강도(YS): 300 MPa 이상, 및 연신율(El): 20% 이상이며, 페라이트와 마르텐사이트의 듀얼 상 조직을 갖는 테일러 웰디드 블랭크(Taylor Welded Blank)용 강재를 제공한다.

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13-05-2015 дата публикации

PRECAST PERMANENT FORM WITH EXPANDED SPACE AND CONSTRUCTION METHOD FOR PIER USING SAME

Номер: KR1020150051504A
Принадлежит:

According to the present invention, provided are a precast permanent form used for the construction of a pier comprising: a body part (100) made of a concrete structure; a weight reducing hole (200) passing through the body part (100) to reduce the weight of a permanent form; and a plurality of expanded spaces (300) which pass through the body part (100) and have a weight reducing hole (200) on the outer side and a construction method for a pier using the same. COPYRIGHT KIPO 2015 ...

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15-01-2016 дата публикации

MODULARITY INTERMODAL SYSTEM

Номер: KR0101585538B1

... 본 발명에 따르면, 차량(1)이 적재되는 적재공간(10)이 구비된 열차에 있어서, 상기 열차는 복수의 모듈이 연결되어 형성되며, 상기 모듈은, 상기 차량(1)이 상기 적재공간(10)으로 출입되기 위한 출입구(110)가 구비된 출입모듈(100); 하층(11) 및 상층(12)을 포함하는 복층 구조의 상기 적재공간(10)이 구비된 복층모듈(200); 및 상기 차량(1)이 상기 하층(11)에서 상기 상층(12)으로 이동될 수 있도록 상기 하층(11)과 상기 상층(12)을 연결하는 연결부(310)가 구비된 경사모듈(300);을 포함하는 것을 특징으로 하는 차량 적재용 열차가 제공된다. 본 발명에 따르면 차량의 출입구 및 적재공간 중 상층으로의 이동 구조를 자유롭게 형성할 수 있는 효과가 있다.

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09-06-2015 дата публикации

PRECAT BUIT-UP PERMANENT FORM EQUIPPED WITH EXPANDED SPACE AND CONSTRUCTION METHOD FOR PIER USING THE SAME

Номер: KR0101527472B1

... 본 발명에 따르면, 교각의 시공에 사용되는 프리캐스트 영구 거푸집에 있어서, 콘크리트 구조물로 이루어진 몸체부(100), 영구 거푸집의 자중을 줄이기 위하여 상기 몸체부(100)를 관통하여 형성된 자중 감소 홀(200) 및 상기 몸체부(100)를 관통하여 형성됨과 아울러, 상기 자중 감소 홀(200)의 외측에 형성된 복수의 확장공간(300)을 포함하는 것을 특징으로 하는 프리캐스트 영구 거푸집 및 이를 이용한 교각의 시공방법이 제공된다.

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19-10-2016 дата публикации

TRACK STRUCTURE HAVING INTEGRATED PROTRUSION AND CONSTRUCTION METHOD THEREOF

Номер: KR1020160121472A
Принадлежит:

According to the present invention, provided is a track structure which comprises: a lower structure (100) in which a protrusion accommodating groove (110) is formed; roadbed concrete (200) formed in an upper portion of the lower structure (100), wherein a protrusion (210) accommodated in the protrusion accommodating groove (110) is formed; and a roadbed (300) formed in an upper portion of the roadbed concrete (200), and supporting a rail (500) and a sleeper (400) coupled to the rail (500). According to the present invention, the lower structure and the roadbed are integrated to improve stability of the track structure. COPYRIGHT KIPO 2016 ...

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15-01-2016 дата публикации

PLATFORM STRUCTURE FOR INTERMODAL SYSTEM

Номер: KR0101585541B1
Принадлежит: 지에스건설 주식회사

... 본 발명에 따르면, 차량(1)이 적재되는 적재공간(2) 및 상기 적재공간(2)으로 상기 차량(1)이 출입되기 위한 출입구(10)를 포함하는 열차에 차량(1)을 적재하기 위한 열차역 플랫폼 구조에 있어서, 상기 적재공간(2)은 상층 및 하층을 포함하는 복층구조로 형성되며, 상기 하층과 대응되는 위치에 형성된 제1 플랫폼(100); 및 상기 상층과 대응되는 위치에 형성된 제2 플랫폼(200);을 포함하는 것을 특징으로 하는 열차역 플랫폼 구조가 제공된다. 본 발명에 따르면 적재공간이 복층으로 형성된 열차에 차량을 각 층별로 직접 적재하는 것이 가능한 효과가 있다.

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31-12-2018 дата публикации

가로보 일체형 거더 및 이를 이용한 거더 일체화 공법

Номер: KR0101934032B1
Принадлежит: 지에스건설 주식회사

... 본 발명에 따르면, 복수의 거더(1, 2)가 결합되어 형성되는 구조물에 사용되는 거더에 있어서, 거더(1)의 외관을 형성하는 본체(100); 및 이웃하는 거더(2)와의 일체화를 위한 가로보 형성부(200);를 포함하되, 상기 이웃하는 거더(2)에 형성된 다른 가로보 형성부(200a)와 대응되어 상기 본체(100)의 측부에서 연장되어 형성되며, 상기 가로보 형성부(200)와 상기 다른 가로보 형성부(200a)가 결합되어, 상기 거더(1)와 상기 이웃하는 거더(2)를 연결하는 가로보(10)를 형성하는 것을 특징으로 하는 가로보 일체형 거더가 제공된다. 본 발명에 따르면 이웃하는 거더를 기초 상부에 거치하는 것만으로 가로보를 시공을 위한 영구 거푸집을 형성할 수 있는 효과를 갖는다.

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13-12-2017 дата публикации

CROSS BEAM-INTEGRATED GIRDER AND CONSTRUCTION METHOD FOR INTEGRATING GIRDER USING SAME

Номер: KR1020170137295A
Принадлежит:

The present invention provides a cross beam-integrated girder. According to the present invention, the girder used for a structure formed as a plurality of girders (1, 2) are connected, including: a main body (100) forming an appearance of the girder (1); and a cross beam forming unit (200) to integrate the girder with a neighboring girder (2). The girder corresponds to the other cross beam forming unit (200a) formed in the neighboring girder (2), and is formed by being extended from a side of the main body (100). As the cross beam forming unit (200) and the other cross beam forming unit (200a) are connected, a cross beam (10) connecting the girder (1) and the neighboring girder (2) is formed. According to the present invention, the cross beam-integrated girder has an effect of forming a permanent mold to construct only a cross beam by placing the neighboring girder on an upper part of a foundation. COPYRIGHT KIPO 2018 ...

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19-11-2015 дата публикации

TRAIN STATION PLATFORM STRUCTURE TO LOAD VEHICLE ON TRAIN AND MOVING METHOD FOR VEHICLE USING SAME

Номер: KR1020150129213A
Принадлежит:

According to the invention, provided is a train station platform structure, which is to load a vehicle (10) on a train having a loading space (2) wherein a vehicle (1) is loaded and an entrance (100) for the vehicle (1) to enter the loading space (2). The loading space (2) is formed to be a multi-layer structure having an upper layer and a lower layer. The train station platform structure comprises: a first platform (100) formed in a position corresponding to the lower layer; and a second platform (200) formed in a position corresponding to the upper layer. According to the present invention, a vehicle can be directly loaded in each layer in a train wherein a loading space is formed to be a multi-layer structure. COPYRIGHT KIPO 2016 ...

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11-12-2015 дата публикации

MODULARIZED TRAIN FOR LOADING VEHICLE AND FORMING METHOD THEREOF

Номер: KR1020150139084A
Принадлежит:

According to the present invention, provided is a train including a loading space (10) for loading a vehicle (1), wherein the train is formed by connecting multiple modules. The modules include: an entrance module (100) including an entrance (110), through which the vehicle (1) enters the loading space (10); a double-layer module (200) having the loading space (10) with a double-layer structure and including a lower layer (11) and an upper layer (12); an inclined module (300) including a connection part (310) for connecting the lower layer (11) to the upper layer (12) so that the vehicle (1) can move from the lower layer (11) to the upper layer (12). According to the present invention, the entrance of a vehicle and the structure of moving to the upper layer in the loading space can be formed freely. COPYRIGHT KIPO 2016 ...

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19-08-2015 дата публикации

CONSTRUCTION METHOD FOR COPING USING PERMANENT FORM PREVENTING INTERFERENCE OF REINFORCING BAR

Номер: KR0101545649B1

... 본 발명은 내부에 철근의 배근 및 콘크리트 타설공간의 형성을 위한 외벽(111) 및 바닥판(112)을 구비한 박스형 구조의 본체(110); 다수가 상기 바닥판(112)의 길이방향을 따라 열지어 매설된 매설철근(120); 교각(10)의 주철근(13)이 관통하도록, 상기 바닥판(112)에 형성된 다수의 주철근 관통공(113);을 포함하고, 상기 주철근 관통공(113)을 관통하여 상측으로 노출되는 상기 주철근(13)과의 간섭을 피하도록, 상기 매설철근(120) 중 일부가 절곡배치된 것을 특징으로 하는 철근간섭을 방지한 철근간섭을 방지한 코핑 시공용 영구거푸집(100)을 제시함으로써, 접근성이 취약한 교각의 상부에 설치되는 구조라 하더라도, 고비용의 대형 장비가 필요 없고, 운반 및 설치작업의 위험이 작으며, 작업이 용이하도록 한다.

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28-02-2018 дата публикации

APPARATUS FOR PRE-TENSIONED CONCRETE MEMBER AND METHOD FOR MANUFACTURING PRE-TENSIONED CONCRETE MEMBER USING SAME

Номер: KR1020180020462A
Принадлежит:

The present invention relates to an apparatus for a pre-tensioned concrete member and a method for manufacturing a pre-tensioned concrete member using the same. According to the present invention, in a production of the pre-tensioned concrete member by introducing of a prestress into a concrete member such as a girder, and the like, a reaction beam capable of supporting a reaction force generated in a process of introducing the prestress is installed at a lower part of a mold for molding the pre-tensioned concrete member. Therefore, the pre-tensioned concrete member can be freely moved and installed and reduces a scale of a site required to produce the pre-tensioned concrete member, thereby reducing a cost of securing the site and greatly reducing the production cost of the pre-tensioned concrete member. COPYRIGHT KIPO 2018 ...

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30-08-2018 дата публикации

MANUFACTURING METHOD OF PRETENSIONED CONCRETE GIRDER WITH TERMINAL END PORTION NEGATIVE MOMENT GENERATION SUPPRESSING COMPOSITION BY INSTALLING ADDITIONAL BLOCK OF TERMINAL END PORTION, AND BRIDGE CONSTRUCTION METHOD USING PRETENSIONED CONCRETE GIRDER MANUFACTURED THEREBY

Номер: KR101892962B1

The present invention relates to a manufacturing method of a pretensioned concrete girder, and a bridge construction method using the pretensioned concrete girder manufactured thereby. When the pretensioned concrete girder is manufactured, a terminal end portion is installed on a girder main body in a way in which an additional block applying a vertical load by using a self-weight can be disassembled and assembled such that the vertical load is applied to the terminal end portion by the additional block. Therefore, in a process of introducing prestress, a negative moment generated in the terminal end portion can be suppressed, and tensile cracks at the top are prevented from occurring. COPYRIGHT KIPO 2018 ...

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11-12-2015 дата публикации

TRACK STRUCTURE WITH INTEGRATED PROTRUSIONS AND CONSTRUCTING METHOD THEREOF

Номер: KR1020150139085A
Принадлежит:

According to the present invention, provided is a track structure with integrated protrusions characterized by comprising: a lower structure (100) with protrusion receiving grooves (110); roadbed concrete (200) formed on a top of the lower structure (100), including the protrusions (210) received in the protrusion receiving grooves (110); and a ballast (300) formed on a top of the roadbed concrete (200), supporting rails (500) and sleepers (400) coupled to the rails (50). According to the present invention, an effect of improving stability of the track structure is obtained by integrating the lower structure and the roadbed concrete. COPYRIGHT KIPO 2016 ...

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03-01-2019 дата публикации

STEEL MATERIAL FOR TAYLOR WELDED BLANK AND METHOD FOR MANUFACTURING HOT-STAMPED PART USING SAME STEEL

Номер: WO2019004541A1
Принадлежит:

Provided according to one aspect of the present invention is a steel material for a Taylor Welded Blank, which includes 0.04-0.06 wt% of carbon (C), 1.2-1.5 wt% of manganese (Mn), 0.01-0.10 wt% of titanium (Ti), 0.01-0.10 wt% of niobium (Nb), and the balance of iron (Fe) and evitable impurities, has a tensile strength (TS) of 550 Mpa or more, a yield strength (YS)of 300 Mpa or more, and an elongation (El) of 20% or more, and has a dual-phase structure of ferrite and martensite.

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