JP2011506766A - 大入熱衝撃靭性に優れた溶接継手を含む溶接構造用鋼 - Google Patents
大入熱衝撃靭性に優れた溶接継手を含む溶接構造用鋼 Download PDFInfo
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- JP2011506766A JP2011506766A JP2010537866A JP2010537866A JP2011506766A JP 2011506766 A JP2011506766 A JP 2011506766A JP 2010537866 A JP2010537866 A JP 2010537866A JP 2010537866 A JP2010537866 A JP 2010537866A JP 2011506766 A JP2011506766 A JP 2011506766A
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- 229910000831 Steel Inorganic materials 0.000 title claims description 22
- 239000010959 steel Substances 0.000 title claims description 22
- 230000035939 shock Effects 0.000 title 1
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 46
- 229910052796 boron Inorganic materials 0.000 claims abstract description 37
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 35
- 229910000746 Structural steel Inorganic materials 0.000 claims abstract description 29
- 239000002131 composite material Substances 0.000 claims abstract description 28
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 13
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 11
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 10
- 239000002245 particle Substances 0.000 claims abstract description 10
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 7
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 4
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 4
- 229910001568 polygonal ferrite Inorganic materials 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 229910052758 niobium Inorganic materials 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 abstract description 4
- 239000010936 titanium Substances 0.000 description 61
- 238000003466 welding Methods 0.000 description 25
- 230000009466 transformation Effects 0.000 description 20
- 239000011572 manganese Substances 0.000 description 18
- 229910052751 metal Inorganic materials 0.000 description 17
- 239000002184 metal Substances 0.000 description 17
- 238000000034 method Methods 0.000 description 16
- 239000002244 precipitate Substances 0.000 description 16
- 239000013078 crystal Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 13
- 230000015572 biosynthetic process Effects 0.000 description 12
- 229910001566 austenite Inorganic materials 0.000 description 11
- 239000010949 copper Substances 0.000 description 10
- 238000005336 cracking Methods 0.000 description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 10
- 239000010955 niobium Substances 0.000 description 10
- 239000011651 chromium Substances 0.000 description 9
- 238000001816 cooling Methods 0.000 description 8
- 229910052761 rare earth metal Inorganic materials 0.000 description 8
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 7
- 230000007423 decrease Effects 0.000 description 7
- 239000006104 solid solution Substances 0.000 description 7
- 230000002411 adverse Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 229910001563 bainite Inorganic materials 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 5
- 230000000704 physical effect Effects 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000006911 nucleation Effects 0.000 description 3
- 238000010899 nucleation Methods 0.000 description 3
- 230000001737 promoting effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229940123973 Oxygen scavenger Drugs 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- VSZWPYCFIRKVQL-UHFFFAOYSA-N selanylidenegallium;selenium Chemical compound [Se].[Se]=[Ga].[Se]=[Ga] VSZWPYCFIRKVQL-UHFFFAOYSA-N 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Nonmetallic Welding Materials (AREA)
- Arc Welding In General (AREA)
Abstract
Description
(1)SAW溶接金属にTiO及びTiO−(Ti,B)N−MnSの複合酸化物を用い、
(2)酸化物の個数(1.0×107個/mm3以上)及び大きさ(0.01〜0.1μm)を夫々制限するステップと、そして、溶接継手の微小構造中の針状フェライトを80%以上に変態及び維持し、
(3)TiO及びTiO−(Ti,B)N−MnSの複合酸化物と固溶ホウ素(B)を確保することで針状フェライト変態を促進する
ことによって特徴付けられる。
溶接金属内のTi/O、Ti/N、B/N、Mn/Sの比を適切に維持すると、TiO酸化物及びTiO−(Ti,B)N−MnSの複合酸化物の個数が適切に分布されるため、溶接金属の凝固過程においてオーステナイト結晶粒の粗大化を防止し、針状フェライト変態を促進する。これは、TiO酸化物及びTiO−(Ti,B)N−MnSの複合酸化物がオーステナイト結晶粒内に適切に分布すると、温度の減少によってオーステナイトで不均一核生成サイトの役割をする粒界フェライトより先に、針状フェライト変態が発生するためである。したがって、このような結果から溶接継手の靭性を画期的に改善できるようになる。
本発明者は、溶接継手に均一に分散される酸化物とは別に、固溶されているBが、結晶粒界に拡散されて、かつ結晶粒界のエネルギーを減少させることにより、結晶粒界において粒界フェライト変態を抑制する役割をすることを見出した。また、Bが酸化物に拡散されて酸化物の周囲にB欠乏域(B−depleted zone)を形成することによって、複合酸化物の周囲の硬化を抑制して針状フェライト変態を促進させることも分かった。
上述した複合酸化物及び固溶Bを用いることにより、本発明で示される微細組織の種類及びその分率を限定する必要性がある。溶接継手の冷却過程において結晶粒界変態よりも先に結晶粒内に針状フェライト変態を促進させることできることなどの、TiO酸化物及びTiO−(Ti,B)N−MnSの複合酸化物を溶接金属内に適切に分布させることが重要である。この場合、溶接継手は85%以上の針状フェライト並びに残部のポリゴナルフェライト及びその他の粒界に不可避に析出されるフェライト組織を有する。
Claims (10)
- 重量%で、C:0.01〜0.2%、Si:0.1〜0.5%、Mn:1.0〜3.0%、Ti:0.01〜0.1%、Ni:0.5〜3.0%、B:0.0003〜0.01%、Mo:0.05〜1.0%、N:0.004〜0.008%、P:0.030%以下、Alを0.005〜0.05%、S:0.030%以下、及びO:0.01〜0.03%、並びに残部Fe及び不可避な不純物を含むことを特徴とする、溶接構造用鋼。
- 前記Ti、O、N及びBが、1.3≦Ti/O≦3.0、7≦Ti/N≦12、0.8≦N/B≦1.5、及び11≦(Ti+4B)/N≦16の関係を満たすことを特徴とする、請求項1に記載の溶接構造用鋼。
- 前記Mn及びSが、220≦Mn/S≦400の関係を満たすことを特徴とする、請求項1に記載の溶接構造用鋼。
- 前記溶接構造用鋼は、Cu:0.01〜2.0%、Nb:0.0001〜0.1%、V:0.005〜0.1%、Cr:0.05〜1.0%、W:0.05〜0.5%、及びZr:0.005〜0.5%からなるグループから選択された1種以上の元素をさらに含むことを特徴とする、請求項1または2に記載の溶接構造用鋼。
- 前記溶接構造用鋼にCuとNiが複合添加される場合、これらの合計含有量は重量%で3.5%以下であることを特徴とする、請求項4に記載の溶接構造用鋼。
- 前記溶接構造用鋼は、0.0005〜0.05%のCa、0.005〜0.05%のREM、またはその両方をさらに含むことを特徴とする、請求項1または2に記載の溶接構造用鋼。
- 前記溶接構造用鋼の溶接継手の微細組織は、組織分率で針状フェライトが85%以上であり、残部はポリゴナルフェライト及びその他の粒界フェライト組織であることを特徴とする、請求項1または2に記載の溶接構造用鋼。
- 前記溶接構造用鋼の溶接継手は、組織内にTiO及びTiO−(Ti,B)N−MnSの複合酸化物が0.5μm以下の間隔で均一に分散されていることを特徴とする、請求項1または2に記載の溶接構造用鋼。
- 前記TiO及びTiO−(Ti,B)N−MnSの複合酸化物は、0.01〜0.1μmの範囲の粒径を有することを特徴とする、請求項8に記載の溶接構造用鋼。
- 前記溶接構造用鋼の溶接継手内のTiO及びTiO−(Ti,B)N−MnSの複合酸化物の粒子数は、1.0×107個/mm3以上であることを特徴とする、請求項8に記載の溶接構造用鋼。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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KR1020070129948A KR100957940B1 (ko) | 2007-12-13 | 2007-12-13 | 대입열 충격인성이 우수한 용접이음부를 포함하는용접구조용강 |
KR10-2007-0129948 | 2007-12-13 | ||
PCT/KR2008/007358 WO2009075542A2 (en) | 2007-12-13 | 2008-12-12 | High strength steel plate for high heat input welding having welded joint with superior impact toughness in weld heat affected zone |
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JP2011506766A true JP2011506766A (ja) | 2011-03-03 |
JP5487114B2 JP5487114B2 (ja) | 2014-05-07 |
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JP (1) | JP5487114B2 (ja) |
KR (1) | KR100957940B1 (ja) |
CN (1) | CN101918607B (ja) |
WO (1) | WO2009075542A2 (ja) |
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JP5607002B2 (ja) | 2011-02-02 | 2014-10-15 | 株式会社神戸製鋼所 | 耐水素脆化感受性に優れた溶接金属 |
JP5606985B2 (ja) * | 2011-04-08 | 2014-10-15 | 株式会社神戸製鋼所 | 耐水素脆化感受性に優れた溶接金属 |
KR101351266B1 (ko) * | 2011-10-21 | 2014-01-15 | 한양대학교 산학협력단 | 저온인성이 우수한 900MPa급 고강도 용접부 |
WO2016072681A1 (ko) * | 2014-11-03 | 2016-05-12 | 주식회사 포스코 | 충격 인성이 우수한 선재 및 그 제조방법 |
CN112522567B (zh) * | 2019-09-19 | 2022-06-24 | 宝山钢铁股份有限公司 | 高强薄规格高耐蚀钢及其制造方法 |
KR20230094724A (ko) * | 2021-12-21 | 2023-06-28 | 주식회사 포스코 | 대입열 인성이 향상된 고강도 용접이음부 |
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- 2007-12-13 KR KR1020070129948A patent/KR100957940B1/ko active IP Right Grant
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2008
- 2008-12-12 WO PCT/KR2008/007358 patent/WO2009075542A2/en active Application Filing
- 2008-12-12 CN CN2008801250346A patent/CN101918607B/zh active Active
- 2008-12-12 JP JP2010537866A patent/JP5487114B2/ja active Active
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CN101918607A (zh) | 2010-12-15 |
KR20090062598A (ko) | 2009-06-17 |
WO2009075542A2 (en) | 2009-06-18 |
CN101918607B (zh) | 2012-09-19 |
JP5487114B2 (ja) | 2014-05-07 |
KR100957940B1 (ko) | 2010-05-13 |
WO2009075542A3 (en) | 2010-07-15 |
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