KR20090070892A - Method for manufacturing of h-beam - Google Patents

Method for manufacturing of h-beam Download PDF

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Publication number
KR20090070892A
KR20090070892A KR1020070139047A KR20070139047A KR20090070892A KR 20090070892 A KR20090070892 A KR 20090070892A KR 1020070139047 A KR1020070139047 A KR 1020070139047A KR 20070139047 A KR20070139047 A KR 20070139047A KR 20090070892 A KR20090070892 A KR 20090070892A
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South Korea
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cooling
rolling
rolled
cooling water
shaped steel
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KR1020070139047A
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Korean (ko)
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지태윤
이건봉
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현대제철 주식회사
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Publication of KR20090070892A publication Critical patent/KR20090070892A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
    • B21B1/088—H- or I-sections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
    • B21B1/12—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel in a continuous process, i.e. without reversing stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B2045/0221—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for structural sections, e.g. H-beams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2263/00—Shape of product
    • B21B2263/02—Profile, e.g. of plate, hot strip, sections

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Abstract

An H-beam manufacturing method is provided to reduce the manufacturing cost by regulating the rolling finishing temperature to control the organization of products. An H-beam manufacturing method comprises a step of hot-rolling an H-beam by heating a semi-product in a heating furnace(10) through rough rolling, intermediate rolling, and finishing rolling, a step of cooling the rolled H-beam with a cooling water spraying unit(100) arranged adjacent to the final rolling mill among the rolling mils for finishing rolling, and a step of cooling and correcting the cooled rolled material in a cooling bed and a correction unit. The H-beam cooling step, in which cooling water is sprinkled onto the bottom and side surfaces of the rolled H-beam, includes rapid cooling to make the surface area have martensite structure and self annealing of the martensite structure by latent heat of uncooled central portion of the H-beam.

Description

형강재의 제조방법{Method for manufacturing of H-beam}Method for manufacturing of section steel {Method for manufacturing of H-beam}

본 발명은 형강재의 제조방법에 관한 것으로, 특히 냉각수 살포장치를 이용한 제어압연기술을 통해 고강도 및 내충격성이 우수한 극후 H빔 형강재를 제조할 수 있도록 한 형강재의 제조방법에 관한 것이다.The present invention relates to a method for producing a shaped steel, and more particularly, to a method for manufacturing a shaped steel material capable of producing ultra-thick H beam shaped steel having high strength and impact resistance through a controlled rolling technique using a cooling water spraying device.

일반적으로, 형강재들중 H빔은 주택, 가시설물등의 건설 현장 뿐만 아니라, 교량 등의 구조물에도 광범위하게 채택되고 있는 실정이다.In general, the H-beam is widely used in construction sites, such as bridges, as well as construction sites, such as houses, furniture.

H빔 형강재는 전기로의 용강이 레들을 통해 레들로에서 정련되고, 정련된 용강이 연속주조설비를 통해 제조된 반제품인 빔 블랭크를 이용하여 초기 조형 공정 및 다수의 연속 밀 압연기로 구성된 공형 공정을 통해 제조된다.The H-beam section is made by ladle of electric furnace in ladle, and the refined molten steel is made of semi-finished beam blank manufactured by continuous casting equipment. Are manufactured.

빔 블랭크는 가열로에서 대략 1100℃의 온도로 약 90분 정도 가열된 후에 열간 압연되어 H빔 형강재의 형태를 갖게 된다.The beam blank is heated in a furnace at a temperature of approximately 1100 ° C. for about 90 minutes and then hot rolled to form a H beam shaped steel.

그중 공형 공정은 조압연, 중간압연, 사상압연으로 구성된다.Among them, the process is composed of rough rolling, intermediate rolling and finishing rolling.

종래 압연기는 롤의 개수와 조립 형태에 따라 2단식 압연기, 3단식 압연기, 4단식 압연기, 특수식 압연기등으로 구분되며, 그중 압연으로 H빔을 제조하기 위해서는 4단식 유니버셜 압연기가 통상 사용되며, 이 압연기에는 상하로 배치된 한 쌍 의 수평롤과 양측에 배치된 한쌍의 수직롤이 동일한 롤스탠드내에 결합된다.Conventional rolling mills are classified into two-stage rolling mills, three-stage rolling mills, four-stage rolling mills, special rolling mills, etc. according to the number of rolls and the type of assembly. Among them, four-stage universal rolling mills are commonly used to manufacture H beams by rolling. In the rolling mill, a pair of horizontal rolls arranged up and down and a pair of vertical rolls arranged on both sides are coupled in the same roll stand.

이러한 기존의 H빔 형강재는 사상압연이 완료된 후에 냉각상을 통과하면서 냉각되고 교정기를 거쳐 교정되어 완제품으로 성형되는 과정을 갖게 되므로, 사상압연의 최종 연속 밀을 통과한 후에 냉각상까지 도달하는 과정중에 별도의 설비없이 압연이 종료된다.Since the conventional H-beam steels have a process of cooling after passing through a cooling bed and being calibrated through a calibrator to form a finished product after finishing rolling, the process of reaching the cooling bed after passing the final continuous mill of finishing rolling Rolling is finished without any equipment.

따라서, 두께 30mm 이상의 극후 H빔 형강재를 생산할 경우에는, 그 두께로 인해 기계적 성질(강도 및 내충격성)을 높여 고강도 내충격 제품을 생산하는 것이 어려운 문제점이 있다.Therefore, when producing an ultra-thick H beam shaped steel having a thickness of 30 mm or more, it is difficult to produce a high strength impact resistant product by increasing mechanical properties (strength and impact resistance) due to its thickness.

두께가 두꺼울수록 내부에 냉각 온도 편차에 따른 응력이 발생할 우려가 있으며, 압연이 종료된 후에 다시 복열에 의해 온도가 상승되어 제품의 변형이 발생될 우려가 있었다.The thicker the thickness, there is a fear that the stress caused by the variation in the cooling temperature therein, the temperature is raised by recuperation after rolling is finished, there is a fear that the deformation of the product.

이를 극복하기 위해 소재 생산시 다양한 합금철 성분을 투입하여 조직 변태를 통해 강도와 내충격성을 높일 수 있으나, 원가 상승의 요인이 될 뿐만 아니라 고강도, 내충격 및 연신율을 동시에 만족하기 어려운 단점이 있었다.In order to overcome this problem, it is possible to increase the strength and impact resistance through the transformation of tissues by inputting various ferroalloys in the production of materials, but it is not only a factor of increasing the cost, but also it is difficult to simultaneously satisfy high strength, impact resistance and elongation.

본 발명은 상기한 제반 문제점을 감안하여 이를 해결하고자 제안된 것으로, 그 목적은 희귀한 합금 원소를 첨가하지 않고도 냉각 온도를 제어함에 따라 우수한 고강도 및 내충격성을 갖는 극후 H빔 형강재를 생산할 수 있도록 한 형강재의 제조방법을 제공하는 데 있다.The present invention has been proposed in view of the above-mentioned problems, and its object is to produce ultra-thick H beam shaped steel having excellent high strength and impact resistance by controlling cooling temperature without adding rare alloying elements. It is to provide a method of manufacturing a section steel.

상기한 목적을 달성하기 위한 본 발명은 반제품을 가열로에서 가열하여 다수개의 압연기들로 구성된 조압연, 중간압연, 사상압연을 거쳐 형강재를 열간 압연하는 단계와,The present invention for achieving the above object is the step of hot-rolling the shaped steel material through the rough rolling, intermediate rolling, finishing rolling consisting of a plurality of rolling mills by heating the semi-finished product in a heating furnace,

상기 사상압연을 구성하는 압연기들중 최종 압연기에 근접되게 배치된 냉각수 분사수단을 통해 압연된 형강재를 냉각하는 단계와,Cooling the rolled section steel through cooling water spraying means disposed close to the final rolling mill among the rolling mills constituting the finishing rolling;

상기 냉각된 압연재를 냉각상과 교정기에서 냉각 및 교정하는 단계를 구비하는 것을 특징으로 한다.And cooling and calibrating the cooled rolled material in a cold bed and a straightener.

상기 형강재를 냉각하는 단계는, 상기 압연된 형강재의 하부면과 측면 부위에 냉각수를 살포하는 것이다.Cooling the section steel, spraying the cooling water on the lower surface and the side portion of the rolled section steel.

상기 형강재를 냉각하는 단계는, 상기 압연된 형강재의 조직을 표면에서 급속 냉각시켜 표면 부위가 마르텐사이트 조직을 갖도록 한 후에, 냉각되지 않은 형강재의 중심 부위에서 잠열에 의해 급속 냉각된 마르텐사이트 조직을 자체 풀림 열처리함으로써,The cooling of the section steel may include: rapidly cooling the tissue of the rolled section steel at the surface so that the surface portion has martensite structure, and then martensite rapidly cooled by latent heat at the center portion of the uncooled section steel. By self-annealing the tissue,

상기 압연된 형강재의 표면에서 내부로 갈수록 마르텐 사이트, 베이나이트, 펄라이트화 조직을 갖도록 한 것이다.It is intended to have martensite, bainite, pearlite structure from the surface of the rolled section to the inside.

상기 냉각수 분사수단을 통해 형강재를 냉각하는 단계는, Cooling the shaped steel material through the cooling water injection means,

상기 냉각수 분사수단이, 상기 압연된 형강재의 양측면 부위에 600±100㎥/hr 유량의 냉각수를 분사하고,The cooling water spraying means sprays the cooling water at a flow rate of 600 ± 100 ㎥ / hr to both side portions of the rolled section steel,

상기 압연된 형강재의 하부면 부위로 각각 250±50㎥/hr 유량의 냉각수를 분사하는 것이다.Spraying the cooling water at a flow rate of 250 ± 50 ㎥ / hr to the lower surface portion of the rolled section steel.

본 발명은 합금 원소의 투입없이 열간 압연시 최종 압연과정이 완료되는 제품의 압연 마무리 온도를 제어하여 제품 조직을 제어할 수 있도록 한 것인 바, 이에 따르면 본 발명은 생산 원가를 절감할 수 있으며 우수한 기계적 성질을 갖는 극후 H빔 형강재를 제조할 수 있는 유용한 효과를 갖는다.The present invention is to control the product structure by controlling the rolling finish temperature of the product is finished the final rolling process during hot rolling without the addition of alloying elements, according to the present invention can reduce the production cost and excellent It has a useful effect to manufacture ultra-thin H-beam shaped steel having mechanical properties.

이하, 본 발명의 바람직한 실시예를 첨부된 도면을 참조하여 상세히 설명하기로 한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

본 발명에 따른 형강재의 제조방법은, 도 1 및 도 2를 참조하여 설명하면, 반제품을 가열로(10)에서 가열하여 초기 조형 공정 압연기(20)에서 압연하고 다수개의 압연기들로 구성된 조압연 압연기(30), 중간압연 압연기(40), 사상압연 압연기(50)를 거쳐 형강재(H: 이하 극후 H빔 형강재와 혼용함)를 열간 압연하고, 사상압연 압연기(50)들중 최종 압연기의 후방에 근접되게 배치된 냉각수 분사수단(100) 을 통해 압연된 형강재(H)의 하부면 및 양측면 부위를 냉각하며, 냉각된 압연재를 냉각상(60)과 교정기(미도시)에서 냉각 및 교정하는 단계들로 이루어진다.1 and 2, the manufacturing method of the shaped steel according to the present invention, the semi-finished product is heated in the heating furnace 10 to roll in the initial forming process rolling mill 20 and rough rolling composed of a plurality of rolling mills Through the rolling mill 30, the intermediate rolling mill 40, the finishing rolling mill 50, hot-rolled section steel (H: mixed with the ultra-low H-beam section steel), the final rolling mill among the finishing rolling mill (50) Cooling the lower surface and both side portions of the rolled steel (H) through the cooling water injection means 100 disposed in close proximity to the cooling of the cold rolled material in the cooling bed 60 and a straightener (not shown) And calibration steps.

더 상세히 설명하면, 압연된 형강재(H)의 조직을 표면에서 급속 냉각시켜 표면 부위가 마르텐사이트 조직을 갖도록 한 후에, 냉각되지 않은 형강재(H)의 중심 부위에서 잠열에 의해 급속 냉각된 마르텐사이트 조직을 자체 풀림 열처리함으로써, 압연된 형강재(H)의 표면에서 내부로 갈수록 마르텐 사이트, 베이나이트, 펄라이트화 조직을 갖도록 한다.In more detail, martensi rapidly cooled by latent heat at the central portion of the uncooled section steel H after rapid cooling of the tissue of the rolled section steel H at the surface such that the surface portion has martensite structure. By self-annealing the site structure, it has martensite, bainite, pearlite structure from the surface of the rolled steel (H) toward the inside.

이를 위해 냉각수 분사수단(100)은 압연되는 형강재(H)의 하부면에 배치되는 하부 냉각수 분사부(110)와, 형강재(H)의 양측면과 이격된 부위에 설치되는 측면 냉각수 분사부(120,130)로 구성되고, 측면 냉각수 분사부(120,130)에서 압연된 형강재(H)의 양측면 부위로 600±100㎥/hr 유량의 냉각수를 분사하고, 하부 냉각수 분사부(110)에서 압연된 형강재의 하부면 부위로 각각 250±50㎥/hr 유량의 냉각수를 분사하는 것이 바람직하다.To this end, the coolant spray means 100 includes a lower coolant spray unit 110 disposed on the lower surface of the rolled steel H and a side coolant spray unit installed at portions spaced apart from both sides of the shaped steel H. 120 and 130, and sprays the cooling water at a flow rate of 600 ± 100 ㎥ / hr to both side portions of the section steel (H) rolled from the side cooling water injection unit (120, 130), and the rolled steel material rolled from the lower cooling water injection unit (110) It is preferable to spray cooling water at a flow rate of 250 ± 50 m 3 / hr to the lower surface portion of.

이는, 사상압연을 구성하는 압연기들중 최종 압연기측에 진입되는 형강재(H)의 온도는 820∼860℃의 온도를 갖게 되며, 최종 압연기에 위치한 냉각수 분사수단(100)에 의해 조직 변태 온도인 660~690℃의 온도를 갖도록 냉각하고, 내부의 자체 복열에 의해 약 50~60℃의 온도가 상승되어 자체 풀림 열처리(self tempering)되어 앞서의 조직 변화를 갖도록 한 것이다.This, the temperature of the section steel (H) entering the final rolling mill side of the rolling mill constituting the finishing rolling has a temperature of 820 ~ 860 ℃, which is the tissue transformation temperature by the coolant injection means 100 located in the final rolling mill It was cooled to have a temperature of 660 ~ 690 ℃, and the temperature of about 50 ~ 60 ℃ by the internal self-reheating to raise the self-annealing (self tempering) to have the previous tissue change.

또한, 압연된 형강재(H)의 하부면 보다 양측면 부위에 냉각수 분사 유량을 더 많이 분사하는 이유는, 형강재(H)의 하부면보다 양측면의 중앙부위의 두께가 더 두껍기 때문에 그 양측면의 중앙 부위에 가장 많은 열을 가지게 되고, 이를 냉각하기 위해 하부면에 분사하는 냉각수의 유량보다 많은 유량을 분사해야 하기 때문이다.In addition, the reason for injecting more coolant injection flow rate to both side portions than the lower surface of the rolled section steel (H), because the thickness of the central portion of both sides is thicker than the bottom surface of the shaped steel (H), the central portion of both sides This is because it has the most heat, and in order to cool it, more flow rate must be injected than the flow rate of the cooling water sprayed on the lower surface.

그리고, 압연된 형강재(H)의 상부면에 냉각수를 살포하지 않는 것은 압연기 롤의 냉각을 위해 기존에도 설치되어 있는 압연롤 냉각장치에서 살포된 냉각수가 H빔형강재(H)의 웨브 상부면에 고여서 잔존하게 되므로, 각 부위별 온도 편차를 조정하기 위해서 별도의 냉각이 필요없기 때문이다.And, not spraying the cooling water on the upper surface of the rolled section steel (H) is that the cooling water sprayed from the existing rolling roll cooling apparatus for cooling the rolling mill roll on the upper surface of the web of the H-beam steel (H) It is because it remains because it is stiff, and since it does not need separate cooling in order to adjust the temperature difference for each site | part.

따라서, 본 발명은 극후 H빔 형강재(H)의 제조시 희귀한 합금 원소를 투입하지 않고도 열간 압연 생산시 냉각 온도를 제어하는 열처리 제어방식에 의해 제품 조직을 제어함으로써, 우수한 기계적 성질을 갖는 제품을 생산할 수 있게 된다.Therefore, the present invention is a product having excellent mechanical properties by controlling the structure of the product by a heat treatment control method for controlling the cooling temperature during hot rolling production without the addition of rare alloying elements in the manufacture of the ultra-thin H-beam steel (H) Will be able to produce.

도 1은 본 발명에 따른 형강재의 제조방법를 개략적으로 나타낸 구성도.1 is a configuration diagram schematically showing a method for manufacturing a shaped steel according to the present invention.

도 2는 본 발명의 냉각수 분사수단을 개략적으로 나타낸 구성도.Figure 2 is a schematic view showing a cooling water injection means of the present invention.

* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

10 : 가열로 30 : 조압연 압연기10: heating furnace 30: rough rolling mill

40 : 중간압연 압연기 50 : 사상압연 압연기40: intermediate rolling mill 50: finishing rolling mill

60 : 냉각상` 100 : 냉각수 분사수단60: cooling bed `100: cooling water injection means

110 : 하부 냉각수 분사부110: lower coolant injection unit

120,130 : 측면 냉각수 분사부120,130: side coolant injection unit

H : 형강재H: section steel

Claims (4)

반제품을 가열로(10)에서 가열하여 다수개의 압연기들로 구성된 조압연, 중간압연, 사상압연을 거쳐 형강재(H)를 열간 압연하는 단계와,Heating the semi-finished product in a heating furnace 10 to hot roll the shaped steel material H through rough rolling, intermediate rolling and finishing rolling composed of a plurality of rolling mills; 상기 사상압연을 구성하는 압연기들중 최종 압연기에 근접되게 배치된 냉각수 분사수단(100)을 통해 압연된 형강재(H)를 냉각하는 단계와,Cooling the rolled form steel (H) through the coolant injection means 100 disposed in close proximity to the final rolling mill of the rolling mill constituting the finishing rolling, 상기 냉각된 압연재를 냉각상과 교정기에서 냉각 및 교정하는 단계를 구비하는 것을 특징으로 하는 형강재의 제조방법.And cooling and calibrating the cooled rolled material in a cold bed and a straightener. 청구항 1에 있어서,The method according to claim 1, 상기 형강재(H)를 냉각하는 단계는, 상기 압연된 형강재(H)의 하부면과 측면 부위에 냉각수를 살포하는 것을 특징으로 하는 형강재의 제조방법.Cooling the section steel (H), the method of manufacturing a steel member characterized in that the cooling water is sprayed on the lower surface and the side portion of the rolled section steel (H). 청구항 1 또는 청구항 2에 있어서,The method according to claim 1 or 2, 상기 형강재(H)를 냉각하는 단계는, 상기 압연된 형강재(H)의 조직을 표면에서 급속 냉각시켜 표면 부위가 마르텐사이트 조직을 갖도록 한 후에, 냉각되지 않은 형강재(H)의 중심 부위에서 잠열에 의해 급속 냉각된 마르텐사이트 조직을 자체 풀림 열처리함으로써,The cooling of the shaped steel material (H) may include: rapidly cooling the tissue of the rolled shaped steel material (H) at the surface so that the surface portion has martensite structure, and then, a central portion of the uncooled shaped steel material (H). Self-annealing heat treatment of martensite tissue rapidly cooled by latent heat at 상기 압연된 형강재(H)의 표면에서 내부로 갈수록 마르텐 사이트, 베이나이트, 펄라이트화 조직을 갖도록 한 것을 특징으로 하는 형강재의 제조방법.Method of producing a steel member characterized in that it has a martensite, bainite, pearlite structure from the surface of the rolled section (H) toward the inside. 청구항 3에 있어서,The method according to claim 3, 상기 냉각수 분사수단(100)을 통해 형강재(H)를 냉각하는 단계는, Cooling the shaped steel (H) through the cooling water injection means 100, 상기 냉각수 분사수단(100)이, 상기 압연된 형강재(H)의 양측면 부위에 600±100㎥/hr 유량의 냉각수를 분사하고,The cooling water injection means 100, spraying the cooling water of 600 ± 100 ㎥ / hr flow rate to both side portions of the rolled section steel (H), 상기 압연된 형강재(H)의 하부면 부위로 각각 250±50㎥/hr 유량의 냉각수를 분사하는 것을 특징으로 하는 형강재의 제조방법.Method for producing a shaped steel, characterized in that for spraying the cooling water of 250 ± 50 ㎥ / hr flow rate to the lower surface portion of the rolled section (H).
KR1020070139047A 2007-12-27 2007-12-27 Method for manufacturing of h-beam KR20090070892A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113059004A (en) * 2021-03-16 2021-07-02 攀钢集团攀枝花钢铁研究院有限公司 Rolling method of section steel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113059004A (en) * 2021-03-16 2021-07-02 攀钢集团攀枝花钢铁研究院有限公司 Rolling method of section steel

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