WO2020101096A1 - Barre d'armature ayant une limite d'élasticité de classe 700 mpa et une excellent rapport de résistance à la traction/limite d'élasticité et un allongement uniforme, et son procédé de fabrication - Google Patents

Barre d'armature ayant une limite d'élasticité de classe 700 mpa et une excellent rapport de résistance à la traction/limite d'élasticité et un allongement uniforme, et son procédé de fabrication Download PDF

Info

Publication number
WO2020101096A1
WO2020101096A1 PCT/KR2018/014517 KR2018014517W WO2020101096A1 WO 2020101096 A1 WO2020101096 A1 WO 2020101096A1 KR 2018014517 W KR2018014517 W KR 2018014517W WO 2020101096 A1 WO2020101096 A1 WO 2020101096A1
Authority
WO
WIPO (PCT)
Prior art keywords
rebar
cooling
mpa
yield ratio
uniform elongation
Prior art date
Application number
PCT/KR2018/014517
Other languages
English (en)
Korean (ko)
Inventor
황병철
이준호
심상철
홍태운
이상인
Original Assignee
고려대학교 산학협력단
서울과학기술대학교 산학협력단
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 고려대학교 산학협력단, 서울과학기술대학교 산학협력단 filed Critical 고려대학교 산학협력단
Priority to US16/617,559 priority Critical patent/US20200277681A1/en
Publication of WO2020101096A1 publication Critical patent/WO2020101096A1/fr

Links

Images

Classifications

    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • 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
    • B21B1/16—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • 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
    • 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
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • 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
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
    • 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
    • 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
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C21D2211/002—Bainite
    • 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
    • C21D2211/005—Ferrite

Definitions

  • the linear velocity of the reinforcing bar is 5 to 20 m / sec
  • the yield ratio and uniform elongation are characterized by cooling with water pressure of 10 to 20 bar and a quantity of 100 to 300 m 3 / hr by water cooling. This excellent yield strength provides 700 MPa class rebar.
  • Figure 2 shows a cross-sectional view of the reinforcing bars in Examples and Comparative Examples according to the present invention.
  • Figure 5 shows a graph showing the hardness by location of one embodiment and a comparative example according to the present invention.
  • Carbon (C) is an element effective for increasing strength, but if the content is low, the desired high strength is not obtained, and if the content is high, it is effective for increasing strength, but since deterioration in toughness and ductility is remarkable, it is 0.18 to 0.30 wt% to obtain high strength. It is preferred.
  • Silicon (Si) is an essential element for deoxidation of steel and is an element effective in increasing strength. If the silicon content is 0.10 wt% or less, a desired high strength is difficult to obtain, and if it exceeds a certain range, a decrease in toughness and ductility is caused. Accordingly, silicon is preferably 0.13 to 0.40 wt%.
  • the tempered martensite structure is formed on the surface part through the cooling process in the first austenite, and the tempered martensite and bainite at the boundary.
  • Low temperature metamorphic tissue such as is formed.
  • the central part is characterized in that bainite is mainly formed and the rest is ferrite.
  • cooling was performed by air cooling at a line speed of 30 m / sec.
  • the reinforcing bars of the comparative examples have a rebar performance of 600 MPa class with a yield strength developed in the prior art.
  • the reinforcing bars of Examples 1 and 2 of the present invention have excellent yield ratio characteristics of 1.25 or higher despite the yield strength being very high of 700 MPa or higher. And high uniform elongation at 5.0% or higher.
  • Comparative Example 2 only a microstructure composed of ferrite and pearlite is formed on both the surface portion and the center portion due to production by air cooling.
  • 3 and 4 show an optical microscope and a scanning electron microscope photograph of Examples and Comparative Examples according to the present invention.
  • Comparative Examples 1 and 3 due to the temper core cooling process, bainite and tempered martensite are partially formed at the boundary, and tempered martensite is formed at the surface, but a soft ferrite and pearlite structure is formed at the center. Yield strength is less than 700 MPa.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

La présente invention concerne une barre d'armature ayant une limite d'élasticité de classe 700 MPa et un excellent rapport de résistance à la traction/limite d'élasticité et un allongement uniforme, et son procédé de fabrication et, plus spécifiquement, une barre d'armature ayant une limite d'élasticité de classe 700 MPa et un excellent rapport de résistance à la traction/limite d'élasticité et un allongement uniforme, dont la partie centrale est composée de structures comprenant de la bainite et de la ferrite, la bainite représentant 20 à 80 % en volume, et son procédé de fabrication.
PCT/KR2018/014517 2018-11-16 2018-11-23 Barre d'armature ayant une limite d'élasticité de classe 700 mpa et une excellent rapport de résistance à la traction/limite d'élasticité et un allongement uniforme, et son procédé de fabrication WO2020101096A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US16/617,559 US20200277681A1 (en) 2018-11-16 2018-11-23 700MPa CLASS STEEL BAR HAVING EXCELLENT YIELD RATIO AND UNIFORM ELONGATION PROPERTY, AND METHOD FOR MANUFACTURING THE SAME

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2018-0141344 2018-11-16
KR1020180141344A KR102173920B1 (ko) 2018-11-16 2018-11-16 항복비와 균일연신율이 우수한 항복강도 700 MPa급 철근 및 그 제조 방법

Publications (1)

Publication Number Publication Date
WO2020101096A1 true WO2020101096A1 (fr) 2020-05-22

Family

ID=70732152

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2018/014517 WO2020101096A1 (fr) 2018-11-16 2018-11-23 Barre d'armature ayant une limite d'élasticité de classe 700 mpa et une excellent rapport de résistance à la traction/limite d'élasticité et un allongement uniforme, et son procédé de fabrication

Country Status (3)

Country Link
US (1) US20200277681A1 (fr)
KR (1) KR102173920B1 (fr)
WO (1) WO2020101096A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114000051A (zh) * 2021-09-29 2022-02-01 武钢集团昆明钢铁股份有限公司 一种超细晶hrb400e盘条抗震钢筋及其制备方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112410677A (zh) * 2020-11-30 2021-02-26 武汉钢铁有限公司 一种500MPa级热轧盘螺及其生产方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090132796A (ko) * 2008-06-23 2009-12-31 동국제강주식회사 고강도 저항복비 철근의 제조방법
KR20110072787A (ko) * 2009-12-23 2011-06-29 주식회사 포스코 항복강도 및 신장 플랜지성이 우수한 강판 및 그 제조방법
JP2012241266A (ja) * 2011-05-24 2012-12-10 Jfe Steel Corp 高圧縮強度耐サワーラインパイプ用鋼管及びその製造方法
CN104018091A (zh) * 2014-06-18 2014-09-03 江苏省沙钢钢铁研究院有限公司 一种钢筋及其制备方法
KR101757591B1 (ko) * 2016-05-27 2017-07-12 현대제철 주식회사 내진용 철근의 제조 방법

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10317100A (ja) * 1997-05-19 1998-12-02 Nippon Steel Corp 高強度、高靱性鉄筋
KR101185242B1 (ko) * 2010-06-28 2012-09-21 현대제철 주식회사 초고강도 철근의 제조방법
WO2013065346A1 (fr) * 2011-11-01 2013-05-10 Ｊｆｅスチール株式会社 Feuille d'acier laminée à chaud, de haute résistance, ayant d'excellentes caractéristiques de flexion et une excellente ténacité aux basses températures et son procédé de fabrication
CN102864374B (zh) * 2012-08-15 2015-02-25 安阳龙腾特钢制造有限公司 一种低屈强比贝氏体组织高强度建筑用箍筋及生产工艺
JP5852549B2 (ja) * 2012-10-30 2016-02-03 株式会社神戸製鋼所 曲げ加工性と溶接継手の疲労特性を兼備した熱延鋼板および角筒状構造体の製造方法
KR101828713B1 (ko) * 2016-06-21 2018-02-12 현대제철 주식회사 철근 및 이의 제조 방법
KR102057765B1 (ko) * 2017-12-29 2019-12-19 현대제철 주식회사 철근 및 이의 제조 방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090132796A (ko) * 2008-06-23 2009-12-31 동국제강주식회사 고강도 저항복비 철근의 제조방법
KR20110072787A (ko) * 2009-12-23 2011-06-29 주식회사 포스코 항복강도 및 신장 플랜지성이 우수한 강판 및 그 제조방법
JP2012241266A (ja) * 2011-05-24 2012-12-10 Jfe Steel Corp 高圧縮強度耐サワーラインパイプ用鋼管及びその製造方法
CN104018091A (zh) * 2014-06-18 2014-09-03 江苏省沙钢钢铁研究院有限公司 一种钢筋及其制备方法
KR101757591B1 (ko) * 2016-05-27 2017-07-12 현대제철 주식회사 내진용 철근의 제조 방법

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114000051A (zh) * 2021-09-29 2022-02-01 武钢集团昆明钢铁股份有限公司 一种超细晶hrb400e盘条抗震钢筋及其制备方法
CN114000051B (zh) * 2021-09-29 2022-05-10 武钢集团昆明钢铁股份有限公司 一种超细晶hrb400e盘条抗震钢筋及其制备方法

Also Published As

Publication number Publication date
KR20200057247A (ko) 2020-05-26
KR102173920B1 (ko) 2020-11-04
US20200277681A1 (en) 2020-09-03

Similar Documents

Publication Publication Date Title
WO2015174605A1 (fr) Feuille d'acier laminé à froid de résistance élévée présentant une excellente ductilité, feuille d'acier galvanisé zingué au feu et son procédé de fabrication
WO2012002638A2 (fr) Barre d'acier à très haute résistance et son procédé de fabrication
WO2021091138A1 (fr) Plaque d'acier présentant une résistance élevée et une excellente ténacité à basse température, et son procédé de fabrication
WO2019107700A1 (fr) Matériau en acier à haute résistance ayant une excellente résistance à la fissuration induite par l'hydrogène et une ténacité à l'impact à basse température et son procédé de fabrication
WO2019132465A1 (fr) Matériau en acier présentant une excellente résistance à la fissuration induite par l'hydrogène et son procédé de préparation
WO2018080108A1 (fr) Acier à haute résistance et haute teneur en manganèse ayant une excellente ténacité à basse température et son procédé de fabrication
WO2017034216A1 (fr) Tôle d'acier à dureté élevée et son procédé de fabrication
WO2014163431A1 (fr) Procédé de fabrication de boulon de haute résistance mécanique et ayant une excellente résistance à la traction
WO2020101096A1 (fr) Barre d'armature ayant une limite d'élasticité de classe 700 mpa et une excellent rapport de résistance à la traction/limite d'élasticité et un allongement uniforme, et son procédé de fabrication
KR20180073389A (ko) 신선가공성이 우수한 고강도 선재, 열처리 선재 및 이들의 제조방법
WO2021172604A1 (fr) Fil machine non traité thermiquement doté d'excellente aptitude à l'étirage et d'excellente résistance aux chocs, et procédé de fabrication associé
WO2020111857A1 (fr) Tôle d'acier chrome-molybdène présentant une excellente résistance au fluage et son procédé de fabrication
WO2020040388A1 (fr) Fil-machine et fil d'acier pour ressort, ayant des propriétés de ténacité et de fatigue sous corrosion améliorées, et procédés de fabrication respectifs associés
KR20080057845A (ko) 연속로 열처리 특성이 우수한 열연강판 및 고강도 강관과그 제조방법
WO2017222122A1 (fr) Barre d'armature et son procédé de fabrication
WO2018110850A1 (fr) Fil machine haute résistance doté d'une résistance au choc supérieure et procédé de fabrication associé
WO2022034964A1 (fr) Barre d'armature à ultra haute résistance et son procédé de fabrication
KR100851805B1 (ko) 충격인성이 우수한 고탄소 강판의 제조 방법
WO2021125471A1 (fr) Fil machine pour ressort à ultra-haute résistance, fil d'acier et procédé de fabrication associé
WO2020111705A1 (fr) Tôle d'acier haute résistance laminée à chaud ayant un excellent allongement et son procédé de fabrication
KR100328051B1 (ko) 고장력강판의제조방법
WO2024136222A1 (fr) Tôle d'acier laminée à froid et son procédé de fabrication
WO2024144040A1 (fr) Tôle d'acier laminée à froid à ultra-haute résistance et son procédé de fabrication
WO2024143832A1 (fr) Tôle d'acier à haute résistance et à formabilité élevée, et son procédé de fabrication
WO2022131752A1 (fr) Fil machine et pièces ayant une résistance à la rupture différée améliorée, et leurs procédés de fabrication

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18939956

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18939956

Country of ref document: EP

Kind code of ref document: A1