WO2016105062A1 - 취성균열전파 저항성이 우수한 고강도 강재 및 그 제조방법 - Google Patents

취성균열전파 저항성이 우수한 고강도 강재 및 그 제조방법 Download PDF

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Publication number
WO2016105062A1
WO2016105062A1 PCT/KR2015/014054 KR2015014054W WO2016105062A1 WO 2016105062 A1 WO2016105062 A1 WO 2016105062A1 KR 2015014054 W KR2015014054 W KR 2015014054W WO 2016105062 A1 WO2016105062 A1 WO 2016105062A1
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Prior art keywords
steel
crack propagation
brittle crack
rolling
propagation resistance
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PCT/KR2015/014054
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English (en)
French (fr)
Korean (ko)
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WO2016105062A8 (ko
Inventor
이학철
장성호
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주식회사 포스코
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Priority to JP2017532655A priority Critical patent/JP6788589B2/ja
Priority to US15/535,582 priority patent/US20170327922A1/en
Priority to EP15873589.4A priority patent/EP3239331B1/en
Priority to CN201580070867.7A priority patent/CN107109597B/zh
Publication of WO2016105062A1 publication Critical patent/WO2016105062A1/ko
Publication of WO2016105062A8 publication Critical patent/WO2016105062A8/ko

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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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • 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
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
    • 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
    • C21D6/001—Heat treatment of ferrous alloys containing Ni
    • 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
    • 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
    • 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
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips 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
    • 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
    • C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
    • 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
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • 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
    • 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
    • C21D2201/00—Treatment for obtaining particular effects
    • C21D2201/05—Grain orientation
    • 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
    • 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
    • C21D2211/009—Pearlite
    • 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

Definitions

  • an object of the present invention is to provide a method for producing a high strength steel having excellent brittle crack propagation resistance.
  • C 0.05 to 0.1%
  • Mn 0.9 to 1.5%
  • Ni 0.8 to 1.5%
  • Nb 0.005 to 0.1%
  • Ti 0.005 to 0.1%
  • Cu 0.1 ⁇ 0.6%
  • Si 0.1-0.4%
  • P 100 ppm or less
  • S 40 ppm or less
  • Microstructure including a single structure selected from the group consisting of ferrite single phase structure, bainite single phase structure, ferrite and bainite complex, ferrite and perlite complex, and ferrite, bainite and perlite complex.
  • Have a high strength steel having excellent brittle crack propagation resistance having a thickness of 50 mm or more is provided.
  • the microstructure is secured to the center of steel by controlling the rolling reduction condition and securing a sufficient center-to-surface temperature difference during rough rolling.
  • C is the most important element for securing basic strength, it needs to be contained in steel within an appropriate range, and in order to obtain such an addition effect, it is preferable to add C 0.05% or more.
  • Ni is more preferably limited to 0.89 to 1.42%, even more preferably 1.01 to 1.35%.
  • Ti is a component that precipitates with TiN upon reheating and inhibits the growth of crystal grains of the base metal and the weld heat affected zone to greatly improve low-temperature toughness. To obtain such an additive effect, Ti is preferably added at least 0.005%.
  • Si improves the strength of the steel and has a strong deoxidation effect
  • coarse phase martensite (MA) phase may be generated to lower brittle crack propagation resistance, so the upper limit of the Si content is preferably limited to 0.4%.
  • the content of Si is more preferably limited to 0.22 to 0.32%, even more preferably 0.25 to 0.3%.
  • the ferrite is preferably polygonal ferrite or acicular ferrite, and bainite is preferably granular bainite.
  • the fraction of pearlite is preferably limited to 20% or less.
  • the steel may preferably have a particle size of 30 ⁇ m or less having a high-angle boundary of 15 degrees or more, as measured by the EBSD method of the center portion.
  • the area ratio of the (100) plane which forms an angle within 15 degrees with respect to the plane perpendicular to the rolling direction is minimized.
  • the temperature difference between the center and the surface of the slab or bar means a difference between the surface temperature of the slab or bar measured immediately before rough rolling and the center temperature calculated in consideration of the cooling conditions and the thickness of the slab or bar immediately before rough rolling. .
  • the austenite structure becomes a deformed austenite structure.
  • the final microstructure according to the miniaturization of the austenite grain may be refined, thereby increasing yield / tensile strength and improving low temperature toughness.
  • yield / tensile strength can be increased and low temperature toughness can be improved through the miniaturization of final microstructure, and also a decrease in the thickness of the center of thickness Can improve the toughness of the core through.
  • the steel sheet may have a thickness of 50 mm or more, preferably 50 to 100 mm, and more preferably 80 to 100 mm.
  • the steel sheet may be cooled at an average cooling rate of 3 to 300 ° C / s.
  • the Ni content is higher than the upper limit of the Ni content of the present invention. Due to the high hardenability, the microstructure of the base material is granular bainite and upper bainite, and is cooled during rough rolling. Although the particle size of the central austenite was refined, the final microstructure had a particle size of 31.2 ⁇ m, and the Kca value also had a value of 6000 or less at -10 ° C.
  • the microstructure has a light structure or acicular ferrite single phase tissue, or a complex structure of acicular ferrite and granular bainite, and a complex structure of acicular ferrite, pearlite and granular bainite.
  • the area ratio of the (100) plane which forms an angle within 15 degrees with respect to the plane perpendicular to the rolling direction at a thickness having a range of 20% of the plate thickness centered on 1/2 part of the thickness is 40% or less, Kca It can be seen that the value also satisfies a value of 6000 or more at -10 ° C.
  • FIG. 1 shows a photograph of the thickness center of the inventive steel 1 observed with an optical microscope. As can be seen from FIG. 1, the thickness center structure is minute.
  • the grain size ( ⁇ m) before finishing rolling was changed to the same composition and manufacturing conditions as those of Inventive Steel 1 of Example 1, except that the grain size ( ⁇ m) was changed as shown in Table 4 below. Was investigated and the results are shown in Table 4 below.

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  • 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)
  • Heat Treatment Of Steel (AREA)
PCT/KR2015/014054 2014-12-24 2015-12-21 취성균열전파 저항성이 우수한 고강도 강재 및 그 제조방법 WO2016105062A1 (ko)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2017532655A JP6788589B2 (ja) 2014-12-24 2015-12-21 脆性亀裂伝播抵抗性に優れた高強度鋼材及びその製造方法
US15/535,582 US20170327922A1 (en) 2014-12-24 2015-12-21 High-strength steel having superior brittle crack arrestability, and production method therefor
EP15873589.4A EP3239331B1 (en) 2014-12-24 2015-12-21 High-strength steel having superior brittle crack arrestability, and production method therefor
CN201580070867.7A CN107109597B (zh) 2014-12-24 2015-12-21 耐脆性裂纹扩展性优异的高强度钢材及其制造方法

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Application Number Priority Date Filing Date Title
KR20140189132 2014-12-24
KR10-2014-0189132 2014-12-24

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WO2016105062A1 true WO2016105062A1 (ko) 2016-06-30
WO2016105062A8 WO2016105062A8 (ko) 2016-11-24

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US (1) US20170327922A1 (zh)
EP (1) EP3239331B1 (zh)
JP (1) JP6788589B2 (zh)
KR (1) KR101746999B1 (zh)
CN (1) CN107109597B (zh)
WO (1) WO2016105062A1 (zh)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN110088333A (zh) * 2016-12-22 2019-08-02 株式会社Posco 具有优异的表面部分nrl-dwt特性的超厚钢材及其制造方法

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US10883159B2 (en) 2014-12-24 2021-01-05 Posco High-strength steel having superior brittle crack arrestability, and production method therefor
US10822671B2 (en) 2014-12-24 2020-11-03 Posco High-strength steel having superior brittle crack arrestability, and production method therefor
JP6504131B2 (ja) * 2016-08-09 2019-04-24 Ｊｆｅスチール株式会社 高強度厚鋼板およびその製造方法
KR102209561B1 (ko) * 2018-11-30 2021-01-28 주식회사 포스코 취성균열전파 저항성이 우수한 극후물 강재 및 그 제조방법
KR102209547B1 (ko) * 2018-12-19 2021-01-28 주식회사 포스코 취성균열개시 저항성이 우수한 구조용 극후물 강재 및 그 제조방법

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